JP2001228432A - Processing method of rotating body, rotating polygon mirror, rotation unit, and rotating body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotating polygon mirror with high durability without increasing the number of components and needing highly accurate adhesion, which prevents the occurrence of the distortion in the side face of a rotating body and can be produced easily. SOLUTION: The rotating body which has a plurality of mirror surface 16b to a side face part has the multipolar magnet 18 necessary for the rotation of the rotating body, and a thin cylinder part 16c in which a multipolar magnet 18 is force-fitted and mounted, for preventing the transmission to mirror surface 16b of the stress generated at the time of force-fitting. The thin cylinder part 16c is turned into the integrated structure at of lower base surfaces 16d intersecting perpendicularly with the mirror surface 16b, and is coaxially disposed with the rotary shaft 17 at the rotary shaft 17 side of the rotating body from the side face part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating body, a rotating polygon mirror, a rotating unit, and a rotating body used in a polygon mirror scanner for scanning a light beam by being incorporated in an electronic copying machine, a laser beam printer, a facsimile or the like. Related to processing method.

[0002]

2. Description of the Related Art FIG. 60 is a sectional view showing a conventional polygon mirror scanner unit. The surface-facing scanner motor of this conventional polygon mirror scanner unit includes a rotor portion and a stator portion. The rotor portion includes a rotor yoke 302 having a magnet 301 mounted on the lower surface, a rotation shaft 303, and a flange 30 fixed to the rotor yoke 302 to fix the rotor yoke 302 to the rotation shaft 303.
And 4.

[0003] The stator portion has a winding coil 3 on its upper surface.
05 and a rotating shaft 303.
And a bearing part 307 for supporting the shaft. A polygon mirror 308 is fixed on the flange 304 of the polygon mirror scanner unit, and scanning can be performed by the polygon mirror 308.

However, in the configuration of the polygon mirror scanner unit, since the polygon mirror 308 and the scanner motor are separate and independent components, and there is a limit to the miniaturization of the scanner motor itself, there is a limit to the scanner motor. There is a problem that the entire structure of the polygon mirror scanner unit on which the polygon mirror 308 is mounted becomes large, and it is difficult to reduce the size. Therefore, there is a problem that a large space is occupied when the image forming apparatus is incorporated in an image forming apparatus such as a laser printer, and it is difficult to reduce the size of the image forming apparatus.

FIG. 62 is a sectional view showing another conventional polygon mirror scanner unit. The circumference-facing scanner motor of this conventional polygon mirror scanner unit includes a rotor portion and a stator portion. The rotor portion includes a rotor yoke 402 having an inner peripheral surface on which a magnet 401 is mounted, a rotation shaft 403, and a flange 404 joined on the rotor yoke 402 and fixing the rotor yoke 402 to the rotation shaft 403. A polygon mirror 408 is fixed on the flange 404 of the polygon mirror scanner unit, and scanning can be performed by the polygon mirror.

[0006] The stator portion includes a stator yoke 406 having a winding coil 405 disposed on the outer peripheral surface thereof, and a rotating shaft 40.
3 and a bearing portion 407 for supporting the bearing 3.

In order to manufacture the rotor portion of the polygon mirror scanner device having the conventional configuration, a rotating shaft is inserted into a flange portion on which the polygon mirror is mounted in parallel with a step of forming and processing a plate-shaped polygon mirror. In the step of fixing the rotor to the flange portion, a fitting product combining the flange, the rotating shaft and the rotor is separately prepared. Further, after the polygon mirror processing, the polygon mirror is mounted on the fitting product in which the flange, the rotating shaft and the rotor are combined, and the position adjustment and fixing are performed so that the rotation center of the polygon mirror coincides with the rotating shaft mounted on the flange.

However, in the configuration of the polygon mirror scanner unit, since the polygon mirror and the scanner motor are separate and independent parts, and there is a limit to the miniaturization of the scanner motor itself, the polygon mirror and the scanner motor are limited. There has been a problem that the entire structure of the polygon mirror scanner unit having the mirror mounted thereon is large and it is difficult to reduce the size. Therefore, there is a problem that a large space is occupied when the image forming apparatus is incorporated in an image forming apparatus such as a laser printer, and it is difficult to reduce the size of the image forming apparatus.

Japanese Patent Laid-Open Publication No. Hei 8-62527 discloses a scanner motor for driving a polygon mirror, which is miniaturized by using a rotor yoke as a base of the polygon mirror.

[0010] As shown in FIG. 61, the scanner motor includes a rotor 310 and a stator 311. The rotor 310 includes a flat rotor yoke 312 having a hexagonal outer shape, and a field permanent magnet 313 mounted on the lower surface thereof.
Consists of Further, the stator 311 includes a field permanent magnet 313.
And a flat armature coil 314, a stator yoke 315, a bearing 316, and a housing 317 in which these parts are assembled.
The rotor 310 and the stator 311 are assembled so that the rotor shaft 318 is supported by the bearing 316.

In this scanner motor, the rotor yoke 312 also serves as a base of the polygon mirror. A hexagonal peripheral surface of the rotor yoke 312 is adhered to the rotor yoke 312 such as a mirror-finished aluminum foil or glass mirror for each side, or a chip mirror 319 separate from the rotor yoke 312 to form a polygon mirror. I have.

With such a configuration, the armature coil 3 is connected via a sensorless three-phase bipolar drive circuit (not shown).
When a DC voltage is applied to the rotor 14, the rotor yoke 312 of the rotor 310 rotates around the rotor shaft 318.

Then, while rotating the scanner motor,
By projecting a light beam from the side toward the mirror yoke 312 separate from the rotor yoke 312, which is a mirror surface formed on the peripheral surface of the rotor yoke 312 presenting a polygon, the rotor yoke 312 functions as a polygon mirror as it is. Operate.

Japanese Patent Application Laid-Open No. Hei 5-241090 discloses a polygon mirror having a ceramic ring, a yoke and a rotor magnet integrally formed as a mirror surface forming body. In this polygon mirror, as shown in FIG. 63, a ceramic ring 501, a yoke 502, and a rotor magnet 503 are integrally cast from an aluminum material forming a mirror surface forming body, and then the surfaces thereof are processed. 504 is formed by vapor deposition to produce a rotating body.

However, when the peripheral surface of the rotor yoke 312 is to be formed as a polygon mirror, a chip-shaped mirror 319 is required.
Adhering or forming a film has a problem that the number of parts increases.

When the chip-shaped mirror 319 is attached, high-precision bonding is required, and there are problems such as peeling and deformation due to centrifugal force after the bonding. Further, even when a coating mirror is formed, there are disadvantages such as peeling and deformation.

Also, since the field permanent magnet 313 is mounted on the flat lower surface of the rotor yoke 312, for example, when the field permanent magnet 133 is attached, the field permanent magnet must be aligned with high precision. There is a risk that the rotor 313 and the rotor shaft 318 may be eccentric. If the rotor 313 is eccentric, the dynamic balance is lost, and the jitter characteristic is deteriorated, and vibration and noise are generated.

Further, since the field permanent magnet 313 is mounted on the flat lower surface of the rotor yoke 312, there are problems such as separation and deformation due to centrifugal force.

Further, in forming the polygon mirror of the rotator portion of the polygon mirror scanner device having the conventional configuration, since the position of the rotation axis is adjusted with respect to the rotation center of the polygon mirror, highly accurate measuring means and fixing means are required. In addition, the influence of the high-speed rotation on the rotor portion of the polygon mirror scanner device over time is that there is a risk that a centrifugal force may cause a displacement of the polygon mirror with respect to the rotation axis, thereby deteriorating jitter characteristics and the like.

In the polygon mirror shape disclosed in Japanese Patent Application Laid-Open No. 5-241090, a magnet is arranged at the lower surface position of the mirror via a thick wall with respect to the mirror portion. The accuracy of the mirror surface may be deteriorated due to the effect of centrifugal force applied to the portion.

Further, in forming the polygon mirror of the rotator portion of the conventional polygon mirror scanner device, high-precision measuring means and fixing means are required because the position of the rotation axis is adjusted with respect to the rotation center of the polygon mirror. It will cost. Further, as an influence of the high-speed rotation on the rotor portion of the polygon mirror scanner device with time, there is a risk that a positional shift of the polygon mirror with respect to the rotation axis may occur due to centrifugal force, and jitter characteristics and the like are deteriorated.

To solve this problem, Japanese Patent Application Laid-Open No. 8-32 is disclosed.
No. 7928 is known. In this polygon mirror device, as shown in FIGS. 64 and 65, in a polygon mirror unit 901a in which a flat rotor 901 of a drive motor and a polygon mirror are integrally formed, a polygon mirror unit 9 is formed.
The mirror position machining of the polygon mirror 01a guarantees the positional accuracy of the mirror with respect to the rotating body. The rotor collar 901b has a function to cut off the escape during mirror machining and to prevent the distortion of the rotor from being transmitted to the mirror surface of the polygon mirror. An annular relief groove 901c is provided between the polygon mirror 901a and the polygon mirror 901a. Note that reference numeral 902 denotes a rotating shaft, and reference numeral 903 denotes a rotor thrust magnet.

[Problems to be solved by the invention]

However, as in the prior art, in order to mirror-process a polygon mirror integrated with a polygon mirror and a rotor as shown in FIG. 65, a cutting tool for mirror-cutting the mirror forming portion is required. It is necessary to arrange a mirror finishing device so as not to contact the rotor portion having a larger diameter than the mirror forming portion.

FIG. 66 is a front view of the left half showing the mirror finishing of the conventional polygon mirror, and the right half is a side view of the same. That is, for example, when a mirror-surface grinding device as shown in FIG. 66 is used, the cutting bit trajectory lower limit line 904 to prevent the cutting bit 611 from interfering with the rotor portion 901b.
It is necessary to arrange the cutting tool 611 above. Therefore, the polygon mirror portion 901a and the rotation center axis 612 of the cutting tool must be arranged so as to be deviated in the direction of the rotation axis of the polygon mirror. In this arrangement, a mirror surface is formed at the lower end portion of the cutting tool track 905.

FIG. 67 is an enlarged view of a mirror surface crest formed by the mirror surface processing shown in FIG. According to this mirror-surface cutting, as shown in FIG. 66, the cutting direction is the longitudinal direction of the mirror forming portion (hereinafter referred to as the main scanning direction. The other direction that forms a plane with this direction is referred to as the sub-scanning direction). Inevitably forms a cutting crease.

In a digital writing optical system using a polygon scanner, each surface of a rotating polygon mirror is irradiated with a scanning beam, and the irradiation beam scans the entire area of the mirror, whereby the reflected beam forms a continuous image. I can do it. When a beam is applied to a mirror having a cutting crest formed in the main scanning direction, an image is scanned in a state where reflection of the beam occurs in the main scanning direction in which the beam scans.

In recent years, the fθ correction optical system employed in a digital writing optical system using a polygon scanner can correct a scanning beam in the sub-scanning direction. However, no effect is obtained in the main scanning direction. Therefore, there is a possibility that the uniformity of the scanning beam may not be obtained in the mirror portion having the crease in the main scanning direction.

If the scanning beam is narrowed down in the main scanning direction and uniformity is required in the main scanning direction in order to obtain a high-definition image in the future, the required technology cannot be achieved. .

Therefore, an object of the present invention is to increase the number of parts, not to require high-precision bonding, to have high durability, to be easy to manufacture, and to generate distortion on the side surface of the rotating body. It is an object of the present invention to provide a rotating body, a rotating polygon mirror, a rotating unit, and a method of processing a rotating body, which can prevent the occurrence of the rotation and can uniformly process the side surface.

[0030]

Means for Solving the Problems In order to achieve the above object, according to the present invention, there is provided a rotating body having a plurality of surfaces on a side surface, wherein an element required for the rotating body to rotate, and Press-fitting, and mounting means for preventing the stress generated during the press-fitting from being transmitted to the side face part, and attaching the mounting means to a first orthogonal face part orthogonal to the side face part. With an integrated structure,
A rotating body, wherein the rotating body is disposed closer to the rotation axis of the rotating body than the side surface portion and is coaxial with the rotating axis.

According to a second aspect of the present invention, in the rotator according to the first aspect, the mounting means has a projection shape coaxial with a rotation axis of the rotator, and the first means is sandwiched between the side portions.
A fitting means is provided on a second orthogonal surface portion facing the orthogonal surface portion.

Further, the invention of claim 3 is the invention of claim 1 or 2
Wherein the mounting means has a substantially cylindrical thin-walled shape.

According to a fourth aspect of the present invention, in the rotating body according to the third aspect, the mounting means arranges the element on an inner peripheral surface thereof, and an outer peripheral surface of the mounting means is the first orthogonal plane portion. And a slope inclined toward the center of the rotation axis from the boundary between the two.

According to a fifth aspect of the present invention, in the rotating body according to the third aspect, the element is arranged on an inner peripheral surface of the mounting means, and the first orthogonal surface portion and the first orthogonal surface portion are arranged. Characterized in that the element end face opposing the element is separated.

According to a sixth aspect of the present invention, in the rotating body according to the third aspect, the mounting means is displaced in a boundary region between the mounting means and the first orthogonal plane by rotation of the rotating body. As described above, the element is arranged on the inner peripheral surface of the mounting means.

According to a seventh aspect of the present invention, in the rotating body according to the first aspect, a central portion of the first orthogonal plane portion is provided with:
A concave portion is formed toward the second orthogonal surface portion facing the first orthogonal surface portion, and the concave portion has a through hole for attaching a rotating shaft.

The invention according to claim 8 is such that a plurality of side surfaces having a mirror surface formed at equal intervals in the circumferential direction, a first orthogonal surface perpendicular to the side surface, and the side surface are sandwiched. A rotary polygon mirror having a mirror surface forming portion having the first orthogonal surface portion and a second orthogonal surface portion facing the first orthogonal surface portion;
A thin-walled cylindrical portion integrally formed with the orthogonal surface portion, an inner circumferential surface of the thin-walled cylindrical portion formed in a substantially cylindrical shape coaxial with the rotation axis of the rotating polygon mirror, and the rotation axis closer to the side surface portion. Formed on the outer peripheral surface of the thin cylindrical portion,
A rotary polygon mirror, wherein the thin cylindrical portion is displaceable in the vicinity of a boundary region between the first orthogonal surface portion and the thin cylindrical portion by press-fitting when a magnet is pressed into the inner peripheral surface. is there.

According to a ninth aspect of the present invention, in the rotary polygon mirror according to the eighth aspect, the second orthogonal plane portion is formed to have substantially the same shape as an end portion of the thin cylindrical portion. It is characterized by having a fitting portion.

According to a tenth aspect of the present invention, in the rotary polygon mirror according to the ninth aspect, the fitting portion has a groove shape.

According to an eleventh aspect of the present invention, in the rotary polygon mirror according to the eighth aspect, a protrusion is formed on the second orthogonal surface portion, and a side surface of the protrusion along the axial direction is the thin wall. It is characterized in that it is in contact with at least one of the outer peripheral surface and the inner peripheral surface of the cylindrical portion, and is formed to have substantially the same surface shape as the outer peripheral surface or the inner peripheral surface in contact therewith.

According to a twelfth aspect of the present invention, in the rotary polygon mirror according to the eighth aspect, the outer peripheral surface is inclined in the axial center direction from the boundary region toward the tip of the thin cylindrical portion. It is characterized by the following.

According to a thirteenth aspect of the present invention, there is provided the rotary polygon mirror according to the eighth aspect, wherein an end of the magnet mounted on the inner peripheral surface on the first orthogonal surface side is in contact with the first orthogonal surface. It is characterized in that a space area portion is provided between them.

According to a fourteenth aspect of the present invention, a plurality of side surfaces having a mirror surface formed at equal intervals in the circumferential direction, a first orthogonal surface perpendicular to the side surface, and the side surface are sandwiched. , A rotating polygon mirror having a mirror surface forming portion having the first orthogonal surface portion and a second orthogonal surface portion facing the same, a magnet mounted on the rotating polygon mirror, and a main body to which a yoke facing the magnet is attached. And a rotating shaft fixed to the main body or the rotating polygon mirror, wherein the magnet and the yoke act to rotate the rotating polygon mirror with respect to the main body about the rotating shaft. A thin cylindrical portion integrally formed with the first orthogonal surface portion; an inner peripheral surface of the thin cylindrical portion formed in a substantially cylindrical shape coaxial with a rotation axis of the rotary polygon mirror; Formed near the rotation axis Is provided, an outer peripheral surface of the thin cylindrical portion, and a yoke attached to the main body in opposition to the inner peripheral surface of the magnet, by a press input when the magnet is pressed into the inner peripheral surface, The rotating unit is characterized in that the thin cylindrical portion is displaceable in the vicinity of a boundary region between the first orthogonal surface portion and the thin cylindrical portion.

According to a fifteenth aspect of the present invention, in the method for processing a rotating body having a plurality of surfaces on a side surface portion, an element having an inner peripheral surface having a cylindrical shape and requiring the rotating body to rotate is provided. A rotary shaft for rotating the rotating body is mounted at the center of the rotating body by press-fitting into an element mounting portion integrally formed on an orthogonal plane orthogonal to the side surface portion. A plurality of rotating bodies stacked with each other, and a collar fitted to the outer peripheral surface of the element mounting portion is provided between adjacent rotating bodies, and the side faces of the plurality of rotating bodies are simultaneously processed. It is a processing method.

According to a sixteenth aspect of the present invention, in the method for processing a rotating body according to the fifteenth aspect, the plurality of rotating bodies are stacked such that respective side surfaces of the rotating bodies are aligned. It is characterized by mirror finishing.

According to a seventeenth aspect of the present invention, in the method for processing a rotating body according to the fifteenth aspect, the processing is thin film formation or cleaning.

[0047] According to an eighteenth aspect of the present invention, in the method for processing a rotating body according to the fifteenth aspect, the rotating body is formed by press working.

According to a nineteenth aspect, in the method for processing a rotating body according to the seventeenth aspect, the cleaning is performed by exposing an inner structure of the rotating body.

[0049]

Embodiments of the present invention will be described below with reference to the drawings. (Next, first to seventeenth embodiments of the present invention will be described.) FIG. 1 is a longitudinal sectional side view of a polygon mirror scanner device according to a first embodiment of the present invention, and FIG. 2 is an exploded view showing an assembled state of a stator yoke. FIG. 3 is a vertical sectional side view of the rotor.

As shown in FIGS. 1 and 2, this polygon mirror scanner device includes a circumferentially opposed brushless DC motor having a stator unit 12 and a rotor unit 11. The stator portion 12 includes a stator yoke 13, a winding coil 14 fixed to a peripheral surface of the stator yoke 13, and a stator yoke 13.
And a bearing 15 provided therein. In addition, the rotating shaft 17 is press-fitted into the center hole 16a of the rotor portion 11,
The rotor 16 has a substantially regular prism shape (in the present embodiment, a regular pentagon in plan view), a mirror surface (side surface of a substantially regular prism) 16 b obtained by cutting and polishing the peripheral surface of the rotor 16, and a first orthogonal surface portion of the rotor 16. It is composed of a thin cylindrical portion 16c which is a mounting means for press-fitting an annular multi-pole magnet 18 as an element to a certain lower bottom surface 16d along the inner circumference, and a multi-pole magnet 18 press-fitted into the thin cylindrical portion 16c. ing. In the drawing, 18 is a multipolar magnet, 19 is a thrust bearing, 20 is a lid, 21 is a recess, and 22 is a substrate. The provision of the recess allows the bearing 15 to be disposed between the mirror surfaces 16b.

The rotor section 11 is rotatably supported by a bearing 15 of the stator section 12 via a rotation shaft 17, and a multi-pole magnet 18 of the rotor section 11 and a winding coil of the stator section 12 are provided. 14 constitute a brushless DC motor facing in the circumferential direction.

As shown in FIG. 3, the rotor 16 is made of an aluminum alloy, and its outer shape is formed in a substantially regular prism. In this embodiment, the rotor 16 is a regular pentagon in plan view, that is, an upper bottom surface which is a second orthogonal plane portion. 16e and the lower bottom surface 16d are both formed in a regular pentagon. The peripheral surface of the rotor 16 is mirror-finished by grinding, and the peripheral surface of the rotor 16 and the mirror surface 16b are integrally formed to form a polygon mirror. Further, a rotary shaft 17 is press-fitted into a center hole 16 a of the rotor 16 in a direction orthogonal to the rotor 16.
In the present embodiment, the case where the bottom of the rotor 16 is a regular pentagon among the regular prisms has been described, but it is needless to say that the rotor 16 may be a regular polygon other than the regular pentagon.

The thin cylindrical portion 16c of the rotor 16
Projects downward from the lower surface, that is, the lower bottom surface 16d of a regular prism,
The multipole magnet 18 is provided concentrically with the center hole 16a and the rotating shaft 17, and the multipolar magnet 18 is press-fitted along the inner periphery of the thin cylindrical portion 16c. Since the thin cylindrical portion 16c is formed closer to the center hole 16a of the rotor 16 than the mirror surface 16b which is a side surface portion, a uniform mirror surface processing is performed as described later with reference to FIGS. be able to.

In the polygon mirror scanner device of this embodiment, since the peripheral surface of the rotor 16 is the mirror surface 16b, it is not necessary to attach other members such as a mirror chip and a vapor deposition film to the peripheral surface of the rotor, and the number of parts increases. do not do. Also, high-precision bonding is not required, and the mirror surface does not peel off due to centrifugal force.

Also, since the polygon mirror has the mirror surface 16b integrally formed on the peripheral surface of the rotor 16, it can be miniaturized, occupies a small occupied space when incorporated in an image forming apparatus such as a laser printer or the like. It can contribute to the conversion.

Further, since the polygon mirror has a mirror surface 16b integrally formed on the peripheral surface of the rotor 16 made of aluminum alloy, the weight of the rotor portion 11 can be reduced, and vibration and vibration can be reduced.
It is advantageous for noise.

Further, since the polygon mirror scanner device of this embodiment has the thin cylindrical portion 16c which is a projection on the lower surface of the rotor 16, the multi-pole magnet 18 is connected to the rotating shaft 1
7, it is easy to position concentrically, and high-precision alignment is not required, and the multipole magnet 18 and the rotating shaft 17 are not eccentric. Therefore, the dynamic balance is not lost due to the eccentricity, and the deterioration of the jitter characteristic can be prevented, and the generation of vibration and noise can be prevented.

Further, since the polygon mirror scanner device of this embodiment has the thin cylindrical portion 16c on the lower surface of the rotor 16, it is easy to press-fit the multi-pole magnet 18 and the multi-pole magnet 18 is moved in the radial direction of the polygon mirror. Since it is positioned and held, it does not peel off due to centrifugal force.

As described above, the polygon mirror scanner device of the present embodiment has high durability because the mirror surface 16b and the multipolar magnet 18 do not peel off due to centrifugal force. In addition, there is no need to perform high-precision bonding when the mirror surface 16b is manufactured, and the positioning of the multipolar magnet 18 is easy, so that manufacturing is extremely easy and the quality is stabilized.

Further, since the multipolar magnet 18 is attached to the rotor 16 integral with the mirror surface 16b by press-fitting, the internal stress due to the press-fitting is reduced by the mirror surface 16 integral with the rotor 16.
b, or the internal stress generated by the centrifugal force may be transmitted to the mirror surface 16b. In the present embodiment, the thin cylindrical portion 16c of the rotor 16 is moved in the radial direction of the polygon mirror P with respect to the mirror surface 16b. Since it is arranged at a position deviated in both the axial direction and the axial direction, it is possible to prevent the internal stress due to the press-fitting or centrifugal force from being transmitted to the mirror surface 16b. The internal stress at the time of press fitting is transmitted to the mirror surface 16b and the mirror surface 1
Since the deformation of the rotor 6b can be prevented, the multipolar magnet 18 can be press-fitted after the mirror finishing of the rotor 16.

In order to prevent the internal stress at the time of press fitting from being transmitted to the mirror surface 16b, first, the thin cylindrical portion 16c
The multi-pole magnet 18 is press-fitted into the inner peripheral surface of. Thereafter, annealing may be performed to remove the processing hysteresis and then mirror-finished, but in this case, annealing is required.

The processing and manufacturing steps for forming the rotor 11 will be described below. A thin cylindrical portion 16c is formed from a flat aluminum alloy material by press working. At this time,
The center hole 16a for press-fitting the rotary shaft is also processed by precision setting in the press working method. Thin cylindrical part 16 from aluminum alloy flat plate by press working method
Although the example of forming c is given, the thin cylindrical portion 16 is cut out from an aluminum alloy rod-shaped material by a cutting method.
It is also possible to form c.

FIG. 4 is a vertical sectional side view showing a situation in which the rotary shaft is being press-fitted into the center hole of the rotor. Next, as shown in FIG. 4, the rotating shaft 17 is pressed into the center hole 16a of the rotor 16.

FIG. 5 is a vertical sectional side view showing a state in which a rotor is mounted and fixed on a processing jig and a sliding surface is cut into a regular polygon in a plan view. Next, as shown in FIG. 5, the peripheral surface of the rotor 16 is mounted on the processing jig 23 so as to grip the rotary shaft 17 inserted into the center hole 16a in order to perform a mirror finish to a regular polygon in plan view. Fix it.

FIG. 6A is a vertical sectional side view showing a state in which a plurality of rotors 16 are mounted on a cleaning / evaporating jig 24 via a collar 25, and FIG. 6B is a cleaning / evaporating jig. Tool 25
FIG. 2 is an exploded perspective view showing a rotor and a rotor 16. As shown in FIG. 6A, the rotors 16 and 25 are alternately stacked to form a frame 2
4b and the thumbscrew 24a. After the mirror surface processing, the cutting oil is loaded on the cleaning / evaporation jig 24 in order to clean the processing cutting oil, and the cleaning is performed in the cleaning tank.

Next, the cleaning / evaporation jig 24 is put into an evaporator together with the cleaning / evaporation jig 24 in order to protect the machined surface formed by the cutting mirror finish, and the protective film is evaporated.

FIG. 7 is a vertical sectional side view showing a state in which the multi-pole magnet is being pressed along the inner periphery of the annular projection of the rotor. As shown in FIG. 7, the rotor 1 has a mirror surface finished by cutting the mirror 16 on the peripheral surface of the rotor 16.
The multi-pole magnet 18 is inserted into 6 with a press-fitting jig 26. The press fitting of the multipolar magnet 18 can be performed in a step performed before the mirror surface processing.

At this time, the rotor 16 has a mirror surface 16 b obtained by cutting the peripheral surface of the rotor 16 into a regular polygon in a plan view. A region 27 is provided between the lower bottom surface 16 d of the polygon and the multipolar magnet 18. The separated region 27 can prevent the press-fitting of the multipole magnet 18 from affecting the surface shape of the mirror surface 16b of the rotor 16 due to the press-fitting.

FIG. 8 is a vertical sectional side view of the polygon mirror scanner device of the second embodiment. As shown in FIG. 8, in the second embodiment, the shape of the rotor 28 is different, and the other configuration is the same as that of the first embodiment.

FIG. 9 is a vertical sectional side view of the polygon mirror scanner device of the third embodiment. As shown in FIG. 9, in the third embodiment, the shape of the rotor 28 is different, and the other parts are the same as in the first embodiment.

According to the present invention, there is provided a polygon mirror scanner device comprising a rotor having a magnet mounted on a rotor, a rotating shaft of the rotor, and a stator having a coil opposed to the magnet at a predetermined distance. In the rotating body, the rotor is formed into a regular prism, a rotating shaft is inserted into the rotor, and each side surface of the regular prism of the rotor is cut and mirror-finished by gripping the rotating shaft inserted into the rotor. According to the manufacturing process of the polygon mirror scanner device,
In a polygon mirror scanner device including a rotor having a magnet mounted on a rotor, a rotation axis of the rotor, and a stator having a coil opposed to the magnet at a predetermined distance, the rotor may be a regular prism. For the polygon mirror scanner device, a polygon mirror is formed by forming each side surface of a regular prism of the rotor as a mirror surface, and a thin cylindrical portion for magnet press-fitting is formed on one bottom surface of the rotor. The polygon mirror is positioned at an equal distance from the rotation axis with the rotation axis as the center, without the need for high-precision positioning bonding of magnets, etc., and without adding a mirror chip or the like separate from the rotor constituting the mirror surface to the rotor. By forming each surface, it is possible to process and manufacture a high-precision rotating body having no displacement of the reflection point with respect to the rotation axis and having no change in performance over time.

Also, in the polygon mirror scanner device of the present invention, a rotor having a magnet mounted on a rotor, a rotating shaft of the rotor, and a stator having a coil opposed to the magnet by a predetermined distance are provided. For the polygon mirror scanner device provided with the above, the rotor is formed in a regular prism, a polygon mirror is formed with each side surface of the regular prism of the roller as a mirror surface, and a thin cylindrical portion is formed on one bottom surface of the rotor. It is intended for a polygon mirror scanner device characterized by the above.

In the polygon mirror scanner device having this configuration, it is not necessary to add a mirror chip or the like separate from the rotor constituting the mirror surface to the rotor, so that the number of parts is not increased, and the magnet is attached to the thin cylindrical portion. Can be manufactured by a method that does not require high-precision positioning bonding or the like. For this purpose, a processing and manufacturing process is devised.

FIG. 10 is a vertical sectional side view of the rotor of the polygon mirror scanner device at the time of mirror surface cutting, and FIG. 11 is a state diagram in the case where the cutting oil has permeated. In the mirror cutting, the peripheral surface of the rotor 16 is cut by a diamond tool attached to the rotary spindle 30 to finish the mirror surface. At this time, the temperature rise of the diamond tool at the cutting point is reduced and the diamond of the non-cut object is reduced. Cutting oil 3 containing kerosene component for the purpose of preventing sticking to cutting tool 3
1 is injected from the injector 32 toward the cutting point.

The plastic used for the magnet is softened and swelled when exposed to cutting oil. For this reason, the lower end surface of the rotor 16 is brought into close contact with the processing jig 23 as shown in FIG. The cutting oil penetrates into the contact surface between the processing jig 23 and the rotor 16 due to the capillary phenomenon and slightly reaches the inside of the rotor 16 as shown in FIG.

FIG. 12 is a vertical sectional side view of a rotor of the polygon mirror scanner device according to the fourth embodiment. As shown in FIG. 12, the lower end surface of the multipole magnet 18 press-fitted so that the permeated cutting oil does not reach or come into contact with the multipole magnet 18, the lower end surface of the thin-walled cylindrical portion 16c of the rotor 16 into which the multipole magnet is press-fitted. Structure that does not lead to

FIG. 13A is a vertical sectional side view of the rotor of the polygon mirror scanner device according to the fourth embodiment at the time of mirror-cutting processing, and FIG. 13B is a state diagram in a case where cutting oil has penetrated. . Although the cutting oil penetrates into the contact surface between the processing jig 23 and the rotor 16 by the capillary phenomenon, the lower end of the multipole magnet 18 does not reach the lower end surface of the thin cylindrical portion 16c into which the multipole magnet 18 is pressed as shown in FIG. With the structure, the penetrating cutting oil does not reach the upper magnet against the gravity.

FIG. 14 is a vertical sectional side view of the rotor of the polygon mirror scanner device of the fifth embodiment. As shown in FIG. 14, a step 16 g may be provided between the rotor 16 and the multi-pole magnet 18.

FIG. 15 is a vertical sectional side view of a rotor of the polygon mirror scanner device according to the sixth embodiment. In this case as well, the shape of the rotor 16 is different from that of the embodiment of FIG. 12, but the relationship between the lower end of the multipole magnet 18 and the lower end of the thin cylindrical portion 16c is similar to that of FIG. It is arranged above the lower end of the cylindrical portion 16c.

FIG. 16 is a vertical sectional side view of a rotor of the polygon mirror scanner device according to the seventh embodiment. Also in this case, the shape of the rotor 16 is different from the embodiment of FIGS.
The relationship between the lower end of the multipolar magnet 18 and the lower end of the thin cylindrical portion 16c is such that the lower end of the multipolar magnet 18 is located above the lower end of the thin cylindrical portion 16c, as in FIGS.

In the above embodiment, a polygon mirror scanner including a rotor having a magnet mounted on a rotor, a rotating shaft of the rotor, and a stator having a coil opposed to the magnet by a predetermined distance. In the apparatus, the rotor is formed into a regular prism, and a polygon mirror is formed with each side surface of the regular prism of the rotor being a mirror surface, and a thin cylindrical portion for magnet insertion is provided on one bottom surface of the rotor. According to the polygon mirror scanner device, wherein the lower surface of the magnet arranged in the portion does not reach the lower surface of the annular thin cylindrical portion of the rotor, the rotor with the magnet mounted on the rotor and the rotor In a polygon mirror scanner device provided with a rotating shaft and a stator having a coil opposed to the magnet at a predetermined distance from the magnet, the rotor is normally Formed in a column, a polygon mirror is formed with each side surface of a regular prism of the rotor being a mirror surface, and a magnet in a state where the magnet is press-fitted in a structure in which a thin cylindrical portion for magnet press-fit is formed on one bottom surface of the rotor. It is possible to make a mirror surface by cutting the regular prism of the rotor without being affected by the cutting oil, so by forming each surface of the polygon mirror at an equal distance from the rotation axis with the rotation axis as the center It is possible to provide a rotating body that is highly accurate without displacement of the reflection point with respect to the rotation axis and whose performance does not change with time.

FIG. 17 is a diagram showing that the influence of the centrifugal force of the magnet on the mirror surface during the high-speed rotation of the polygon mirror scanner device according to the first embodiment is prevented. As shown in FIG.
The centrifugal force caused by the rotation of the rotor 16 tends to deform outward from the center of rotation. However, since the centrifugal force has a region 16 h separated between the lower bottom surface of the rotor 16 and the upper surface of the multipolar magnet 18, the deformation The force does not reach the mirror surface and the rotor 16
Of the mirror surface portion 16b can be prevented.

According to the present invention, there is provided a polygon mirror scanner device comprising a rotor having a magnet mounted on a rotor, a rotating shaft of the rotor, and a stator having a coil opposed to the magnet by a predetermined distance. Forming the rotor into a regular prism, forming a polygon mirror with each side surface of the regular prism of the rotor being a mirror surface, forming a thin cylindrical portion for magnet press-fitting on one bottom surface of the rotor, and a magnet press-fitting direction. It is an object of the present invention to provide a structure for preventing a press-fitting pressure of a magnet from affecting a mirror surface.

In a polygon mirror scanner device comprising a rotor having a magnet mounted on a rotor, and a stator having a rotating shaft of the rotor and a coil opposed to the magnet at a predetermined distance from the magnet, When a polygon mirror is formed by forming a regular prism and forming a polygon mirror with each side surface of the regular prism of the rotor being a mirror surface, and forming a thin cylindrical portion for magnet press-fitting on one bottom surface of the rotor to constitute a polygon mirror scanner device. Thus, it is possible to prevent the surface shape from being affected by the magnet press-fitting pressure after the mirror surfaces of the respective side surfaces of the regular prism of the rotor are formed.

Further, in this polygon mirror scanner device, when a magnet is press-fitted and a space is formed between the magnet and a portion corresponding to the lower bottom surface of the portion having the regular prism portion and the magnet, the centrifugal force during high speed rotation is reduced. Since the cylindrical portion can be bent and absorbed, a rotor whose mirror surface is not deformed can be manufactured.

According to the present invention, there is provided a polygon mirror scanner comprising: a rotor having a magnet mounted on a rotor; a rotating shaft of the rotor; and a stator having a coil opposed to the magnet by a predetermined distance. It is an object of the present invention to prevent the accuracy of the mirror surface from deteriorating due to the effect of the centrifugal force applied to the magnet portion during high-speed rotation.

In a polygon mirror scanner device comprising a rotor having a magnet mounted on a rotor, and a stator having a rotating shaft of the rotor and a coil opposed to the magnet by a predetermined distance, Formed in a regular prism, a polygon mirror is formed with each side surface of the regular prism of the rotor being a mirror surface, a protrusion for magnet press-fitting is formed on one bottom surface of the rotor, and the regular prism portion of the rotor is pressed at the time of magnet press-fit. By having a space between the magnet and the lower bottom equivalent position, the effect of the centrifugal force generated by the magnet during high-speed rotation is not transmitted to the mirror surface shape, which reduces jitter characteristics as a polygon mirror scanner device. Can keep good.

FIG. 18 is a vertical sectional side view of a polygon mirror scanner according to an eighth embodiment of the present invention, and FIG. 19 is a perspective view of a rotor portion.

The polygon mirror scanner device 110 of the eighth embodiment includes a circumferentially opposed brushless DC motor having a stator portion 112 and a rotor portion 111. The stator portion 112 includes a stator yoke 113, a winding coil 114 fixed to a peripheral surface of the stator yoke 113, and a bearing 115 provided in the stator yoke 113. Further, the rotor portion 111 has a center hole 116.
a, a rotating surface 117 is press-fitted into the rotor 116a, a mirror surface (side surface of a regular prism) 116b obtained by grinding and polishing the peripheral surface of the rotor 116 into a regular polygon in plan view, and a multi-pole on the lower bottom surface of the rotor 116. A protrusion 116c which is an annular thin-walled cylindrical portion into which the magnet 118 is press-fitted along the inner circumference;
The multi-pole magnet 118 is press-fitted into the rotor 16c, and the annular groove 116h is formed on the upper bottom surface of the rotor 116 and is a fitting means for fitting the lower end of the protrusion 116c.

The rotor section 111 is rotatably supported by a bearing 115 of the stator section 112 via a rotating shaft 117, and a multi-pole magnet 118 of the rotor section 111 and a winding coil of the stator section 112. The brushless DC motor 114 is opposed to the circumferential direction 114 to constitute a brushless DC motor.

The rotor 116 is made of an aluminum alloy and has an outer shape of a regular prism. In this embodiment, the rotor 116 has a regular hexagonal shape in plan view, that is, both upper and lower bottom surfaces are regular hexagonal shapes. The peripheral surface of the rotor 116 is
The mirror surface is finished by grinding, and the peripheral surface of the rotor 116 and the mirror surface 116b are integrated with each other to form a polygon mirror P.
Is configured. Further, the center hole 11 of the rotor 116
A rotation shaft 117 is press-fitted into 6 a in a direction perpendicular to the rotor 116. In the present embodiment, the rotor 116
Has been described for the case where the bottom surface is a regular hexagon among the regular prisms, but may be a regular polygon other than the regular hexagon.

The protrusion 116c of the rotor 116
Is provided concentrically with the center hole 116a and the rotating shaft 117, protruding downward from the lower surface, that is, the lower bottom surface of the regular prism, and is provided along the inner periphery of the projection 116c.
18 is press-fitted. The central hole 116a and the rotating shaft 1 protrude upward from the upper surface of the rotor 116,
An annular groove 116h for lamination concentric with 17 is integrally formed. The annular groove 116h can prevent deformation due to fastening force during processing as described later.

The protrusion 116c of the rotor 116
Is provided concentrically with the center hole 116a and the rotating shaft 117, protruding upward from the upper surface, that is, the upper bottom surface of the regular prism, and is provided along the inner periphery of the protrusion 116c.
18 may be press-fitted.

The protrusion 116c of the rotor 116 is arranged at a position deviated in both the radial direction and the axial direction of the polygon mirror P with respect to the mirror surface 116b. That is, the deviated position is a position where the radial deviation is closer to the center of the predetermined distance from the mirror surface 116b and the axial deviation does not face the mirror surface.

The axial length of the projection 116c is:
As shown in FIGS. 18 and 19, since the length of the multi-pole magnet 118 is shorter than the length of the multi-pole magnet 118 to be press-fitted, the force acting on the rotor 116 from the multi-pole magnet 118 when the multi-pole magnet 118 is press-fitted can be diffused. it can. By changing the length of the protruding portion 116c to the length of the multipolar magnet 118, the internal stress can be released.

In the polygon mirror scanner device 110 of this embodiment, since the peripheral surface of the rotor 116 is the mirror surface 116b, it is not necessary to attach other members such as a mirror chip and a vapor deposition film to the peripheral surface of the rotor. Does not increase. Also, high-precision bonding is not required, and the mirror surface does not peel off due to centrifugal force.

Further, since the polygon mirror P has a mirror surface 116b integrally formed on the peripheral surface of the rotor 116, it can be miniaturized and requires a small occupied space when incorporated in an image forming apparatus such as a laser printer. This can contribute to downsizing.

Further, since the polygon mirror P has a mirror surface 116b integrally formed on the peripheral surface of the rotor 116 made of aluminum alloy, the weight of the rotor 111 can be reduced, which is advantageous for vibration and noise. is there.

The polygon mirror scanner device 110 of this embodiment has a projection 116 on the lower surface of the rotor 116.
c, the multi-pole magnet 118 is
It is easy to perform concentric positioning, and high-precision positioning is not required, and the multi-pole magnet 118 and the rotating shaft 117 are not eccentric. Therefore, the dynamic balance is not lost due to the eccentricity, and the deterioration of the jitter characteristic can be prevented, and the generation of vibration and noise can be prevented.

The polygon mirror scanner 110 of this embodiment has a projection 116 on the lower surface of the rotor 116.
Since the multi-pole magnet 118 has c, it is easy to press-fit the multi-pole magnet 118, and since the multi-pole magnet 118 is positioned and held in the radial direction of the polygon mirror P, it does not peel off due to centrifugal force.

As described above, the polygon mirror scanner device 110 of this embodiment has high durability because the mirror surface 116b and the multipolar magnet 118 do not peel off due to centrifugal force. In addition, there is no need to perform high-precision bonding when manufacturing the mirror surface 116b, and the positioning of the multipolar magnet 118 is easy, so that manufacturing is extremely easy and the quality is stabilized.

The rotor 116 integrated with the mirror surface 116b
Since the multi-pole magnet 118 is attached to the mirror 116 by press fitting, there is a possibility that internal stress due to press fitting is transmitted to the mirror surface 116b integrated with the rotor 116, or internal stress generated by centrifugal force is transmitted to the mirror surface 116b. In the present embodiment, the protrusion 116c of the rotor 116 is
Since the polygon mirror P is disposed at a position deviated in both the radial direction and the axial direction with respect to the polygon mirror 6b, it is possible to prevent the internal stress due to the press-fitting or the centrifugal force from being transmitted to the mirror surface 116b. Internal stress at the time of press fitting is mirror surface 116b
And the mirror surface 116b is prevented from being deformed, so that the multi-pole magnet 18 can be press-fitted after the rotor 116 is mirror-finished.

In order to prevent the internal stress at the time of press-fitting from being transmitted to the mirror surface 116b, first, the protrusion 116c
The multi-pole magnet 118 is press-fitted into the inner peripheral surface of the. Thereafter, annealing may be performed to remove the processing hysteresis and then mirror-finished, but in this case, annealing is required.

FIG. 20A is a bottom view showing a modification of the projection of the polygon mirror, and FIG. 20B is a bottom view showing another modification of the projection.

As shown in FIG. 20A, the protrusion 116
c is divided into six equal parts, each of which is formed into an arc-shaped projection 116d having the same shape, and the center of each arc-shaped projection 116d is arranged corresponding to the apex angle 116f.

By dividing the protruding portion 116c in this manner, the arc-shaped protruding portion 116d constituting the protruding portion is easily deformed when the multipole magnet 118 is press-fitted, and the multipole magnet 118 is easily press-fitted. Further, a material that is difficult to deform can be used as the blank of the polygon mirror P.

In this modification, the arc-shaped projection 116d is divided into six parts, but may be divided into twelve parts in the circumferential direction. That is, when the regular polygonal prism has an n-sided polygon, it is desirable to divide a × n (a is a natural number) in terms of dynamic balance.

Further, as shown in FIG. 20B, the ends of the arc-shaped projections 116d equally divided into six may be arranged so as to correspond to the apex angle.

FIG. 21 is a vertical sectional side view of the polygon mirror scanner device of the ninth embodiment. The polygon mirror scanner device 120 according to the ninth embodiment includes a face-to-face brushless DC motor including a stator unit 122 and a rotor unit 121. The stator part 122 includes a stator yoke 123
, A winding coil 124 fixed to the upper surface of the stator yoke 123, and a bearing 125 provided at the center of the stator yoke 123. Also, the rotor part 1
Reference numeral 21 denotes a rotor 126 in which a rotating shaft 127 is press-fitted into a center hole 126a, and a mirror surface (side surface of a regular prism) 116 obtained by grinding and polishing the peripheral surface of the rotor 126 into a regular polygon in plan view.
b, an annular protrusion 126 c for press-fitting the multi-pole magnet 128 along the inner circumference to the lower surface of the rotor 126, a multi-pole magnet 128 press-fitted to the protrusion 126 c, and formed on the upper bottom surface of the rotor 126. And an annular groove 116h into which the lower end of the projection 126c is fitted. The rotor part 121 is rotatably supported by a bearing 125 of the stator part 122 via a rotary shaft 127, and a multi-pole magnet 128 of the rotor part 121 and a winding coil 12 of the stator part 122.
4 constitute a brushless DC motor facing the surface direction.

The rotor 126 is made of an aluminum alloy similarly to the rotor 16 of the first embodiment, and has an outer shape of a regular prism. In this embodiment, the rotor 126 has a regular hexagonal shape in plan view.
That is, both the upper bottom surface and the lower bottom surface are formed in a regular hexagon. The peripheral surface of the rotor 126 is mirror-finished by grinding, and the polygon mirror P is formed by integrally forming the peripheral surface of the rotor 126 and the mirror surface 126b. Further, a rotation shaft 127 is press-fitted into a center hole 126 a of the rotor 126 in a direction perpendicular to the rotor 126. Note that, in the present embodiment, the case where the bottom of the rotor 126 is a regular hexagon among the regular prisms has been described, but it goes without saying that the rotor 126 may be a regular polygon other than a regular hexagon.

Also, the protrusion 126c of the rotor 126
Is provided concentrically with the center hole 126a and the rotating shaft 127 so as to protrude downward from the lower surface, that is, the bottom surface of the regular prism, and is provided along the inner periphery of the protrusion 126c.
8 is press-fitted.

The protrusion 126c of the rotor 126 is disposed at a position deviated in both the radial direction and the axial direction of the polygon mirror P with respect to the mirror surface 126b. That is, the radial deviation is a position closer to the center of the predetermined distance from the mirror surface, and the axial deviation is a position not facing the mirror surface.

The surface-facing polygon mirror scanner shown in FIG. 22 has the same operation and effect as those of the circumferentially-facing polygon mirror scanner shown in FIG.

FIG. 22 is a vertical sectional side view of the polygon mirror scanner device of the tenth embodiment. 22 to FIG.
In the fourth embodiment, the same parts as those in the eighth embodiment of FIG. 18 are denoted by the same reference numerals, and the description thereof will be omitted.

The polygon mirror scanner device 130 of the tenth embodiment is different from the polygon mirror scanner device 110 of the embodiment of FIG. 18 in that a part of the multipole magnet press-fitting projection 116c, that is, a part of the lower part of the inner peripheral surface is removed. The multi-pole magnet 118 is press-fitted by forming a cut-out portion 116e by notch, thereby facilitating deformation of the protrusion 116c at the time of press-fitting.

FIG. 23 is a vertical sectional side view of the polygon mirror scanner device of the eleventh embodiment. The polygon mirror scanner device 140 of this embodiment is different from the polygon mirror scanner device 110 of the embodiment of FIG.
A cutout 116e is formed by cutting out a part of the outer periphery 16c, that is, the upper end of the outer peripheral surface, and the multipole magnet 118 is press-fitted therein, thereby facilitating the deformation of the protrusion 116c at the time of press-fitting.

FIG. 24 is a vertical sectional side view of the polygon mirror scanner device of the twelfth embodiment. The polygon mirror scanner device 150 of this embodiment is different from the polygon mirror scanner device 110 of the embodiment of FIG.
The multipole magnet 118 is press-fitted by cutting a part of 16c, that is, the outer periphery into a tapered shape, and facilitates deformation of the projection at the time of press-fitting.

Although the case of the circumferentially opposed brushless motor of the eighth embodiment has been described with reference to FIGS. 22 to 24, the present invention is applied to the case of the surface opposed brushless motor of the ninth embodiment of FIG. Can also.

FIGS. 25A and 25B are views showing a mirror processing of a modification of the polygon mirror. FIG. 25A shows a state in which polygon mirror blanks before mirror processing are stacked, and FIG. 25B shows a state in which the stacked polygon mirrors are fixed. Is shown.

The polygon mirror blank p can fit the rotor 116, a protrusion 116 c for press fitting of the multi-pole magnet projecting downward from the rotor 116, and the protrusion 116 c on the protrusion 116 c on the upper surface of the rotor 116. And an annular groove 116h. The polygon mirror blank p before grinding is laminated by inserting the projection 116c of the upper polygon mirror blank p into the annular groove 116h of the lower polygon mirror blank p as shown in FIG. At this time, the depth of the annular groove 116h is
16c is shorter than the axial length of 16c.
In the two polygon mirror blanks p, the rotors 116 do not contact each other, the inner peripheral surface of the annular groove 116h and the lower end of the protrusion 1116c contact each other, and are positioned in the axial direction and the radial direction. Further, since the rotors do not contact each other, the rotor surface is not damaged during the grinding / polishing processing.

As shown in FIG. 25 (B), the laminated body of the polygon mirror blanks has a first jig 119c whose end is inserted into the annular groove 116h of the uppermost polygon mirror blank p and the lowermost polygon. Plate-shaped second jig 119d abutting on the lower end surface of protrusion 116c of mirror blank p
, And the bolt-like fixture 119a is inserted into the center holes of the first jig 119c and the second jig 119d and the center hole 116a of the polygon mirror blank p, and fastened with the nut-like fixture 119b. Can be integrally fixed. Thus, the outer peripheral surface of each polygon mirror blank p of the laminated body integrally fixed can be simultaneously ground and polished. Therefore, the efficiency of the grinding / polishing process can be improved. In addition, since the fastening force applied from the fixture to the polygon mirror blank p is on a straight line parallel to the axis, deformation of the polygon mirror P can be prevented.

FIG. 26 is a diagram showing the mirror finishing of another modified example of the polygon mirror, and FIG. 27 is an enlarged view of the principal part.

This polygon mirror blank is formed on an inclined surface directed toward the center of the lower end surface of the projection 116c of the polygon mirror blank p in FIG. 25, that is, a tapered surface 116i in which the inner diameter of the annular projection expands toward the tip. When the projection 116c is inserted into the bottom surface of the annular groove, the projection 116
c, an inclined surface following the tapered surface 116i, that is, the tapered surface 11
6j. By forming in this manner, the internal stress due to the fastening force transmitted from the projection 116c to the groove is directed toward the center, so that the mirror surface can be prevented from being deformed due to the internal stress. Further, when inserting the multipolar magnet, it can be guided by the inclined surface 116i, so that the insertion is easy. Further, the inclined surface 11
Since 6i is formed, it is easy to remove the laminated polygon mirror blank p. In addition, the slope 11
By providing a clearance between the outer peripheral surface of the protrusion 116c where the 6i is formed and the outer peripheral surface of the groove, the protrusion 1
The internal stress at the time of press-fitting in the mirror direction from 16c can be more completely prevented.

FIG. 28 is a vertical sectional side view of a polygon mirror scanner according to a thirteenth embodiment of the present invention, and FIG. 29 is a perspective view of a rotor portion.

The polygon mirror scanner device 210 according to the thirteenth embodiment includes a circumferentially opposed brushless DC motor having a stator portion 212 and a rotor portion 211.
The stator portion 212 includes a stator yoke 213, a winding coil 214 fixed to a peripheral surface of the stator yoke 213,
And a bearing 215 provided in the stator yoke 213. Further, the rotor part 211 is provided with the center hole 21.
A rotor 216 having a rotating shaft 217 press-fitted into 6a; a mirror surface (side surface of a regular prism) 216b obtained by grinding and polishing the peripheral surface of the rotor 216 into a regular polygon in plan view;
An annular projection 216c for press-fitting the multi-pole magnet 218 along the inner circumference on the lower bottom surface, a multi-pole magnet 218 press-fitted on the projection 216c, and a lamination for projecting upward on the upper bottom surface of the rotor 216. And a projection 216g.

The rotor section 211 is rotatably supported by a bearing 215 of the stator section 212 via a rotating shaft 217, and a multi-pole magnet 218 of the rotor section 211 and a winding coil of the stator section 212. 214 constitute a brushless DC motor in the circumferential direction.

The rotor 216 is made of an aluminum alloy and has an outer shape of a regular prism. In this embodiment, the rotor 216 has a regular hexagonal shape in plan view, that is, both upper and lower bottom surfaces are regular hexagonal shapes. The circumferential surface of the rotor 216 is
The mirror surface is finished by grinding, and the peripheral surface of the rotor 216 and the mirror surface 216b have an integral structure to form the polygon mirror P.
Is configured. Further, the center hole 21 of the rotor 216
A rotation shaft 217 is press-fitted into 6 a in a direction perpendicular to the rotor 216. In the present embodiment, the rotor 216
Has been described for the case where the bottom surface is a regular hexagon among the regular prisms, but may be a regular polygon other than the regular hexagon.

The protrusion 216c of the rotor 216
Is provided concentrically with the center hole 216a and the rotating shaft 217, protruding downward from the lower surface, that is, the lower bottom surface of the regular prism, and is provided along the inner periphery of the projection 216c.
18 is press-fitted. The center hole 216a and the rotating shaft 2 protrude upward from the upper surface of the rotor 216, that is, the upper bottom surface of the regular prism.
An annular stacking projection 216g concentric with 17 is integrally formed.

The protrusion 216c of the rotor 216
Is provided concentrically with the center hole 216a and the rotating shaft 217, protruding upward from the upper surface, that is, the upper bottom surface of the regular prism, and is provided along the inner periphery of the projection 216c.
18 may be press-fitted.

The protrusion 216c of the rotor 216 is disposed at a position deviated in both the radial direction and the axial direction of the polygon mirror P with respect to the mirror surface 216b. In other words, the deviated position is a position where the radial deviation is closer to the center of the predetermined distance from the mirror surface 216b and the axial deviation does not face the mirror surface.

The axial length of the projection 216c is:
As shown in FIGS. 28 and 29, since the length of the multi-pole magnet 218 to be press-fitted is shorter than the length, the force acting on the rotor 216 from the multi-pole magnet 218 when the multi-pole magnet 218 is press-fitted can be diffused. it can. By changing the length of the protruding portion 216c to the length of the multipolar magnet 218, the internal stress can be released.

In the polygon mirror scanner of this embodiment, since the peripheral surface of the rotor 216 is the mirror surface 216b,
It is not necessary to attach other members such as a mirror chip and a vapor deposition film to the peripheral surface of the rotor, and the number of components does not increase. Also, high-precision bonding is not required, and the mirror surface does not peel off due to centrifugal force.

Since the polygon mirror P has a mirror surface 216b formed integrally with the peripheral surface of the rotor 216, the polygon mirror P can be miniaturized and requires a small occupied space when incorporated in an image forming apparatus such as a laser printer. This can contribute to downsizing.

Further, since the polygon mirror P has the mirror surface 216b integrally formed on the peripheral surface of the rotor 216 made of an aluminum alloy, the weight of the rotor portion 211 can be reduced, which is advantageous for vibration and noise. is there.

The polygon mirror scanner 210 of this embodiment has a projection 216 on the lower surface of the rotor 216.
c, the multi-pole magnet 218 is
It is easy to perform concentric positioning, and high-precision positioning is not required, and the multipole magnet 218 and the rotating shaft 217 are not eccentric. Therefore, the dynamic balance is not lost due to the eccentricity, and the deterioration of the jitter characteristic can be prevented, and the generation of vibration and noise can be prevented.

The polygon mirror scanner 210 of this embodiment has a protrusion 216 on the lower surface of the rotor 216.
Since the multi-pole magnet 218 has c, it is easy to press-fit the multi-pole magnet 218. Since the multi-pole magnet 218 is positioned and held in the radial direction of the polygon mirror P, it does not peel off due to centrifugal force.

As described above, the polygon mirror scanner device 210 of this embodiment has high durability because the mirror surface 216b and the multipolar magnet 218 do not peel off due to centrifugal force. In addition, there is no need to perform high-precision bonding when manufacturing the mirror surface 216b, and since the positioning of the multipolar magnet 218 is easy, the manufacturing is extremely easy and the quality is stabilized.

Further, the rotor 216 integrated with the mirror surface 216b
Since the multi-pole magnet 218 is attached by press-fitting, internal stress due to press-fitting may be transmitted to the mirror surface 216b integral with the rotor 216, or internal stress generated by centrifugal force may be transmitted to the mirror surface 216b. In the present embodiment, the protrusion 216c of the rotor 216 is
Since the polygon mirror P is disposed at a position deviated in both the radial direction and the axial direction with respect to b, it is possible to prevent the internal stress due to the press-fitting or the centrifugal force from being transmitted to the mirror surface 216b. Since the internal stress at the time of press-fitting can be prevented from being transmitted to the mirror surface 216b and deforming the mirror surface 216b, the multipolar magnet 218 can be press-fitted after the mirror surface processing of the rotor 216.

In order to prevent the internal stress at the time of press-fitting from being transmitted to the mirror surface 216b, first, the protrusion 216c
The multi-pole magnet 218 is press-fitted into the inner peripheral surface of. Thereafter, annealing may be performed to remove the processing hysteresis and then mirror-finished, but in this case, annealing is required.

FIG. 30A is a bottom view showing a modification of the projection of the polygon mirror, and FIG. 30B is a bottom view showing another modification of the projection.

As shown in FIG. 30A, the protrusion 216
c is divided into six equal parts, each of which is formed in an arc-shaped projection 216d having the same shape, and the center of each arc-shaped projection 216d is arranged corresponding to the apex angle 216f.

By dividing the projection 216c in this manner, the arc-shaped projection 216d constituting the projection is easily deformed when the multipole magnet 218 is press-fitted, and the multipole magnet 218 is easily press-fitted. Further, a material that is difficult to deform can be used as the blank of the polygon mirror P.

Although this modification is divided into six parts, each arc-shaped projection 216d may be divided into twelve parts by dividing it in the circumferential direction into two equal parts. That is, when the regular polygonal prism has an n-sided polygon, it is desirable to divide a × n (a is a natural number) in terms of dynamic balance.

Further, as shown in FIG. 30B, the ends of the arc-shaped projection 216d equally divided into six may be arranged so as to correspond to the apex angle.

FIG. 31 is a vertical sectional side view of the polygon mirror scanner device according to the fourteenth embodiment. The polygon mirror scanner device 220 according to the fourteenth embodiment includes a face-to-face brushless DC motor including a stator part 222 and a rotor part 221. The stator part 222 includes the stator yoke 2
23, a winding coil 224 fixed to the upper surface of the stator yoke 223, and a bearing 225 provided at the center of the stator yoke 223. The rotor part 221 includes a rotor 226 in which the rotation shaft 227 is press-fitted into the center hole 226a, and a mirror surface (side surface of a regular prism) formed by grinding and polishing the peripheral surface of the rotor 226 into a regular polygon in plan view.
26b and a multi-pole magnet 228 on the lower surface of the rotor 226.
And a multi-pole magnet 228 press-fitted into the protrusion 226c. The rotor part 221 is rotatably supported by a bearing 225 of the stator part 222 via a rotating shaft 227, and the multi-pole magnet 228 of the rotor part 221 and the winding coil 224 of the stator part 222 are in the plane direction. And a brushless DC motor.

The rotor 226 is made of an aluminum alloy similarly to the rotor 116 of the eighth embodiment, and its outer shape is formed as a regular prism. In this embodiment, the rotor 226 has a regular hexagonal shape in plan view, that is, an upper bottom surface and a lower bottom surface. Each is formed in a regular hexagon. The peripheral surface of the rotor 226 is mirror-finished by grinding, and the peripheral surface of the rotor 226 is
and b constitute an integral structure to form the polygon mirror P. Further, a rotation shaft 227 is press-fitted into a center hole 226 a of the rotor 226 in a direction orthogonal to the rotor 226. In the present embodiment, the case where the bottom of the rotor 226 is a regular hexagon among the regular prisms has been described, but it goes without saying that the rotor 226 may be a regular polygon other than a regular hexagon.

The protrusion 226c of the rotor 226
Is provided concentrically with the center hole 226a and the rotating shaft 227 so as to protrude downward from the lower surface, that is, the bottom surface of the regular prism, and is provided along the inner periphery of the projection 226c.
8 is press-fitted.

The protrusion 226c of the rotor 226 is disposed at a position deviated in both the radial direction and the axial direction of the polygon mirror P with respect to the mirror surface 226b. That is, the radial deviation is a position closer to the center of the predetermined distance from the mirror surface, and the axial deviation is a position not facing the mirror surface.

The surface-facing polygon mirror scanner shown in FIG. 31 has the same operation and effect as those of the circumferentially-facing polygon mirror scanner shown in FIG.

FIG. 32 is a vertical sectional side view of the polygon mirror scanner device according to the fifteenth embodiment. 32 to FIG.
In the fourth embodiment, the same parts as those in the thirteenth embodiment of FIG. 28 are denoted by the same reference numerals, and the description thereof will be omitted. Further, since the protrusions for lamination are the same as those in the embodiment of FIG. 28, the description and illustration thereof are omitted.

The polygon mirror scanner device 230 of the fifteenth embodiment is different from the polygon mirror scanner device 210 of the embodiment of FIG. 28 in that a part of the multipole magnet press-fitting projection 216c, that is, a part of the lower portion of the inner peripheral surface is removed. The multi-pole magnet 218 is press-fitted by forming a cut-out notch 216e, thereby facilitating deformation of the protrusion 216c during press-fitting.

FIG. 33 is a vertical sectional side view of the polygon mirror scanner device of the sixteenth embodiment. The polygon mirror scanner device 240 of this embodiment differs from the polygon mirror scanner device 210 of the embodiment of FIG.
A cutout 216e is formed by cutting out a part of the outer periphery 16c, that is, the upper end of the outer peripheral surface, and the multipole magnet 218 is press-fitted therein, thereby facilitating deformation of the protrusion 216c at the time of press-fitting.

FIG. 34 is a vertical sectional side view of the polygon mirror scanner device according to the seventeenth embodiment. The polygon mirror scanner device 250 of this embodiment differs from the polygon mirror scanner device 210 of the embodiment of FIG.
The multipole magnet 218 is press-fitted by cutting a part of 16c, that is, the outer periphery into a tapered shape, and facilitates deformation of the projection at the time of press-fitting.

Although the case of the circumferentially opposed brushless motor of the eighth embodiment has been described with reference to FIGS. 32 to 34, the present invention is applied to the case of the surface-facing brushless motor of the fourteenth embodiment of FIG. Can also.

FIGS. 35A and 35B are views showing the mirror finishing of the polygon mirror. FIG. 35A shows a state in which polygon mirror blanks before mirror processing are stacked, and FIG. 35B shows a state in which the stacked polygon mirror blanks are fixed. .

This polygon mirror blank is the mirror surface 21 of the polygon mirror P of the polygon mirror scanner shown in FIG.
6b for cutting and polishing the outer periphery of the rotor 216 before the outer periphery is ground and polished.
Protrusion 21 for press-fitting multi-pole magnet projecting downward from
6c, and a ring-shaped stacking projection 216g, which protrudes upward from the rotor 216 and whose inner circumference is adjacent to the outer circumference of the stacked projection 216c of the other polygon mirror blank p. As shown in FIG. 35 (A), the polygon mirror blank p before grinding is arranged such that the laminating projection 216g of the lower polygon mirror blank p is outside the multipole magnet press-fitting projection 216c of the upper polygon mirror blank p. And laminated.

At this time, since the axial length of the stacking projection 216g is shorter than the axial length of the multipole magnet press-fitting projection 216c, the two polygon mirror blanks p are stacked. The inner peripheral surface of the protrusion 216g contacts the outer peripheral surface of the press-fit protrusion 216c, and the rotor 2
The upper surface of the protrusion 16 and the lower end surface of the press-fit protrusion 216c are in contact with each other, and are positioned in the axial direction and the radial direction.

As shown in FIG. 35B, the laminated body of the polygon mirror blank p is adjacent to the inside of the lamination projection 216g of the uppermost polygon mirror blank p and corresponds to the press-fit projection 216c. The stacked body is sandwiched between the first jig 219c contacting the position and the plate-shaped second jig 219d abutting on the lower end surface of the projection 216c of the lowermost polygon mirror blank p. The central holes of the first jig 219c and the second jig 219d and the central hole 216a of the polygon mirror blank p can be inserted and fastened with a nut-like fixing member 219b to be integrally fixed. The outer peripheral surface of each polygon mirror blank p of the laminated body integrally fixed in this way can be simultaneously ground and polished to process the mirror surface 216b. Therefore, the efficiency of the grinding / polishing process can be improved by reducing the number of steps.

Further, since the fastening force applied from the fixtures 219a and 219b to the polygon mirror blank p is on a straight line parallel to the axis, deformation of the polygon mirror P can be prevented. Furthermore, in this embodiment, since the stacking protrusion 216g does not contact the inner periphery of the press-fit protrusion 216c, the inner circumferential surface of the protrusion 216c for press-fitting and positioning the multipolar magnet 218 may be damaged. Absent. Therefore, the multi-pole magnet 218 is not caught or displaced when the multi-pole magnet 218 is press-fitted.

The case where two polygon mirror blanks are stacked has been described above, but it goes without saying that two or more polygon mirror blanks may be stacked.

FIGS. 36A and 36B are views showing mirror finishing of another modification of the polygon mirror. FIG. 36A shows a state in which polygon mirror blanks before mirror processing are stacked, and FIG. 36B shows a state where the stacked polygon mirror is fixed. It shows the state where it was done.

This polygon mirror blank is the same as the rotor 2
16, a multi-pole magnet press-fit protrusion 216c protruding downward from the rotor 216, and a ring-shaped lamination protrusion 216g protruding upward from the rotor 216 and having an outer periphery adjacent to the inner periphery of the protrusion 216c. Have been. As shown in FIG. 36 (A), the polygon mirror blank p before grinding is attached to the stacking projection 216g of the lower polygon mirror blank p inside the projection 216c for press-fitting the multi-pole magnet of the upper polygon mirror blank p. And laminated.

At this time, since the axial length of the stacking projection 216g is shorter than the axial length of the multipole magnet press-fitting projection 216c, the two polygon mirror blanks p are stacked. The inner peripheral surface of the protrusion 216g contacts the outer peripheral surface of the press-fit protrusion 216c, and the rotor 2
The upper surface of the protrusion 16 and the lower end surface of the press-fit protrusion 216c are in contact with each other, and are positioned in the axial direction and the radial direction.

As shown in FIG. 36B, this laminate of polygon mirror blanks p is adjacent to the outside of the lamination projections 216g of the uppermost polygon mirror blank p and corresponds to the press-fit projections 216c. The stacked body is sandwiched between the first jig 219c contacting the position and the plate-shaped second jig 219d abutting on the lower end surface of the projection 216c of the lowermost polygon mirror blank p. The central holes of the first jig 219c and the second jig 219d and the central hole 216a of the polygon mirror blank p can be inserted and fastened with a nut-like fixing member 219b to be integrally fixed. The outer peripheral surface of each polygon mirror blank p of the laminated body integrally fixed in this way can be simultaneously ground and polished to process the mirror surface 216b. Therefore, the efficiency of the grinding / polishing process can be improved by reducing the number of steps. Further, since the fastening force applied from the fixtures 219a and 219b to the polygon mirror blank p is on a straight line parallel to the axis, deformation of the polygon mirror P can be prevented.

In the embodiment of FIG. 36, FIG.
Similarly to the embodiment, the axial length of the stacking protrusion 216g is formed to be longer than the axial length of the multipole magnet press-fitting protrusion 216c, and the outer peripheral surface of the stacking protrusion 216g and the press-fitting are formed. The two polygon mirror blanks p are positioned in the axial direction and the radial direction by contacting the inner peripheral surface of the protrusion 216c of the first member and the lower surface of the rotor 216 and the upper end surface of the protrusion 216c for press-fitting. It may be.

FIGS. 37A and 37B are views showing mirror finishing of another modification of the polygon mirror. FIG. 37A shows a state in which polygon mirror blanks before mirror processing are stacked, and FIG. 37B shows a state where the stacked polygon mirror is fixed. It shows the state where it was done.

In the polygon mirror blank p, the protrusion 216c can be fitted on the rotor 216, a protrusion 216c for press-fitting the multipolar magnet projecting downward from the rotor 216, and the protrusion 216c on the upper surface of the rotor 216. And a ring-shaped groove 216h. As shown in FIG. 37A, the polygon mirror blank p before grinding is laminated by inserting the projection 216c of the upper polygon mirror blank p into the groove 216h of the lower polygon mirror blank p. At this time, the depth of the groove 216h is
Since the two polygon mirror blanks p are formed to be shorter than the axial length of the protrusions 216c, the inner peripheral surface of the groove 216h and the lower end of the protrusion 216c do not contact each other. , Are positioned axially and radially. Further, since the rotors do not contact each other, the rotor surface is not damaged during the grinding / polishing processing.

As shown in FIG. 37 (B), the laminated body of the polygon mirror blank has a first jig 2 whose end is inserted into the groove 216h of the uppermost polygon mirror blank p.
19c and the projection 2 of the lowermost polygon mirror blank p
The laminate is sandwiched between a plate-like second jig 219d abutting on the lower end surface of the first jig 2c and the bolt-like fixture 219a.
19c and the center hole of the second jig 219d and the center hole 216a of the polygon mirror blank p, and can be integrally fixed by fastening with a nut-shaped fixing member 219b. Thus, the outer peripheral surface of each polygon mirror blank p of the laminated body integrally fixed can be simultaneously ground and polished. Therefore, the efficiency of the grinding / polishing process can be improved. In addition, since the fastening force applied from the fixture to the polygon mirror blank p is on a straight line parallel to the axis, deformation of the polygon mirror P can be prevented.

FIG. 38 is a diagram showing mirror finishing of another modified example of the polygon mirror, and FIG. 39 is an enlarged view of the principal part.

This polygon mirror blank is formed on an inclined surface directed toward the center of the lower end surface of the projection 216c of the polygon mirror blank p in FIG. 39, that is, a tapered surface 216i in which the inner diameter of the annular projection expands toward the tip. When the projection 216c is inserted into the bottom surface of the groove, the inclined surface follows the tapered surface 216i of the projection 216c, that is, the tapered surface 216j.
It is formed in. By forming in this manner, the internal stress due to the fastening force transmitted from the projection 216c to the groove is directed toward the center, so that the mirror surface can be prevented from being deformed by the internal stress. Further, when the multi-pole magnet is inserted, it can be guided by the tapered surface 216i, so that the insertion is easy. Furthermore, the inclined surface 21
Since 6i is formed, it is easy to remove the laminated polygon mirror blank p. In addition, the slope 21
By providing a clearance between the outer peripheral surface of the protrusion 216c where the 6i is formed and the outer peripheral surface of the groove, the protrusion 2
The internal stress at the time of press-fitting in the mirror direction from 16c can be more completely prevented.

(Hereinafter, the polygon mirror scanner of the eighteenth embodiment will be described, and a polygon mirror blank used in the polygon mirror scanner of the eighteenth embodiment will be described as an example of a method of manufacturing a polygon mirror blank.)

FIG. 40 is a longitudinal sectional side view of a polygon mirror scanner device according to the eighteenth embodiment. FIG. 41 is an exploded perspective view of a rotor portion used in the device. FIG. It is sectional drawing.

As shown in FIG. 40, this polygon mirror scanner device includes a circumferentially opposed brushless DC motor having a stator portion 301 and a rotor portion 302 as a rotating body.

[0174] The stator portion 301 includes a stator yoke 303.
A winding coil 304 as a drive coil, which is a magnetic force generating member fixed to the peripheral surface of the hollow cylindrical portion 303a of the stator yoke 303; a radial bearing 305 provided in the stator yoke 303; A thrust bearing 3010 for supporting the direction and a control board 309 attached to the stator yoke 303 are provided. Note that the winding coil 304 may be fixed to the control board 309.

The rotor portion 302 includes a rotor 308 as a mirror rotor having a substantially regular prism shape (in this embodiment, a regular hexagon in plan view) having a rotating shaft 306 press-fitted into a center hole 308c; A mirror surface (side surface of a substantially regular prism) 308a as a reflecting portion having a peripheral surface cut by mirror finishing,
A thin cylindrical portion 308b as a rotor portion, which is a mounting portion for fixing an annular multipolar magnet 307 as an element along the inner circumference to a lower bottom surface 308e, which is a first orthogonal surface portion of the rotor 308, by press-fitting, bonding, or the like; , Thin-walled cylindrical part 30
8b. In this specification, a regular prism or a substantially regular prism includes a deformation within a range in which a dynamic balance of a required accuracy as a rotating body can be maintained. The multipole magnet may be a pair of N and S magnets.

The rotor portion 302 is rotatably supported by a radial bearing 305 and a thrust bearing 310 of the stator portion 301 via a rotating shaft 306, and the multi-pole magnet 307 of the rotor portion 302 and the stator portion are rotated. 301 wound coil 30
4 and a predetermined distance in the circumferential direction are opposed to each other to form a brushless DC motor. That is, the cylindrical surface on the outer periphery of the winding coil 304 is opposed to the cylindrical surface on the inner periphery of the multipole magnet 307 while keeping a certain interval constant.

As shown in FIGS. 41 and 42, the rotor 3
08 is made of an aluminum alloy, the outer shape of which is formed into a substantially regular prism. In the present embodiment, an upper surface 308f and a lower surface 308e which are a regular hexagon in plan view, that is, a second orthogonal surface portion.
Are all formed in a regular hexagon. Also, the rotor 3
08 is mirror-finished by grinding, and the peripheral surface of the rotor 308 and the mirror surface 308a are integrally formed to form a polygon mirror. Further, the rotor 308
The rotary shaft 306 is press-fitted into the center hole 308c of the second shaft 308c in a direction perpendicular to the rotor 308. In the present embodiment,
Although the case where the bottom of the rotor 308 is a regular hexagon among the regular prisms has been described, it goes without saying that the rotor 308 may be a regular polygon other than the regular hexagon.

Also, the thin cylindrical portion 30 of the rotor 308
8b is provided concentrically with the center hole 308c and the rotary shaft 306, protruding downward from the lower surface, that is, the lower bottom surface 308e of the regular prism, and the multipolar magnet 307 is press-fitted along the inner periphery of the thin cylindrical portion 308b. You.

In the polygon mirror scanner device of this embodiment, since the peripheral surface (side surface) of the rotor 308 is a mirror surface 308a, it is not necessary to attach other members such as a mirror chip and a vapor deposition film to the peripheral surface of the rotor. Points and assembly man-hours can be reduced, and costs can be reduced. In addition, high-precision bonding is not required, and the mirror surface does not peel off due to centrifugal force or the like.

Further, since the polygon mirror has the mirror surface 308a integrally formed on the peripheral surface of the rotor 308, the size can be reduced, and a small occupied space is required when the polygon mirror is incorporated in an image forming apparatus such as a laser printer. It can contribute to the conversion.

Further, since the polygon mirror has the mirror surface 308a integrally formed on the peripheral surface of the rotor 308 made of aluminum alloy, the weight of the rotor portion 302 can be reduced.
This is advantageous for reducing vibration and noise. In particular, since the rotor 308 can be formed from a high-purity aluminum alloy material, is lightweight and has excellent dynamic balance, it can cope with high-speed rotation and has an advantageous configuration for reducing vibration and noise.

Further, since the polygon mirror scanner device of this embodiment has the thin cylindrical portion 308b as a projection on the lower surface of the rotor 308, it is easy to position the multipolar magnet 307 concentrically with the rotating shaft 306. In addition, high-precision positioning is not required, and the multi-pole magnet 307 and the rotating shaft 306 are not eccentric. Therefore, the dynamic balance is not lost due to the eccentricity, and the deterioration of the jitter characteristic can be prevented, and the generation of vibration and noise can be prevented.

The polygon mirror scanner of this embodiment has a thin cylindrical portion 308b on the lower surface of the rotor 308.
, It is easy to press-fit the multi-pole magnet 307, and since the multi-pole magnet 307 is positioned and held in the radial direction of the polygon mirror, it does not peel off due to centrifugal force.

As described above, the polygon mirror scanner device of the present embodiment has high durability because the mirror surface 308a and the multipolar magnet 307 do not peel off due to centrifugal force. In addition, there is no need to perform high-precision bonding when the mirror surface 308a is manufactured, and the positioning of the multipolar magnet 307 is easy, so that manufacturing is extremely easy and the quality is stabilized.

Also, the rotor 308 integrated with the mirror surface 308a is
Since the multipolar magnet 307 is attached to the mirror surface 308 by press-fitting, internal stress due to press-fitting may be transmitted to the mirror surface 308a integrated with the rotor 308, or internal stress generated by centrifugal force may be transmitted to the mirror surface 308a. In the present embodiment, the thin cylindrical portion 308b of the rotor 308 is
Since it is arranged at a position deviated in both the radial direction and the axial direction with respect to the surface 08a, it is possible to prevent the internal stress due to the press-fitting or the centrifugal force from being transmitted to the mirror surface 308a. Since the internal stress at the time of press-fitting can be prevented from being transmitted to the mirror surface 308a and deforming the mirror surface 308a, the rotor 308 can be prevented from deforming.
After the mirror finishing, the multipolar magnet 307 can be press-fitted.

Further, as described above, the thin cylindrical portion 308
A regular prism integrated with b (for example, a regular prism having a regular hexagon)
According to the configuration in which the side surface is formed as the reflecting surface 308a, the number of components constituting the rotor portion 302 can be reduced, and the number of assembling steps can be reduced, thereby significantly reducing the cost. In particular, since the rotor 308 can be formed from a high-purity aluminum alloy material, it is lightweight and has excellent dynamic balance. Therefore, it is possible to cope with a high-speed rotation, which is advantageous in reducing vibration and noise.

The processing and manufacturing steps for manufacturing the mirror rotor blank of the rotor section 2 will be described below.

Hereinafter, an embodiment of a method for manufacturing a rotor blank according to the present invention will be described with reference to FIGS. 43 is a diagram showing a shape of a forging die for manufacturing a rotor blank, (A) is a bottom view of the forging die, (B) is a cross-sectional view of the forging die,
(C) is a top view of the forged receiving die, and (D) is a cross-sectional view of the forged receiving die. FIG. 44 is a diagram showing the shape of the forged material,
(A) is a top view of the forged material, and (B) is a cross-sectional view of the forged material. .

As shown in FIG. 43, the forging die is
FIG. 43 (B) is a cross-sectional view of a stamping die having an annular groove 311c for forming a thin cylindrical portion 308b and a convex portion 311d for forming a concave portion. FIG. 43 (A) shows a pressing mold surface 311b, and FIG. 43 (D) shows a side surface forming recess 312d and a rotary shaft gripping portion forming recess 312c which form the side surface of the rotor. A receiving mold section 312a is shown, comprising:
FIG. 43 (C) shows the receiving mold surface 312b.

As shown in FIG. 44, forged material 313
Has a substantially regular prism shape having a regular polygonal forged material upper surface 313a and a rectangular forged material side surface 313b. Regarding the method of forming the forged material 313, first, a rod having a regular polygonal cross section is formed by molding a molten aluminum alloy by an extrusion die, and the rod is cut along a regular polygonal surface. This regular prism-shaped bar is used for forging 313.
Use as In this case, no additional man-hours are required, which is advantageous in terms of blank manufacturing cost. As for the method of forming the forged material 313, a bar material blank obtained by extruding a molten aluminum alloy into a bar shape and turning into the shape of the forged material 313 may be used.

FIG. 45 is a diagram showing a manufacturing process by forging. In addition, the forging equipment which applies an external force to a metal mold | die for forging is not described in the figure. FIG. 45 (A)
As shown in FIG. 7, first, a side surface forming recess 312 which is a regular polygonal outer shape frame of a forging receiving die 312 installed in a forging facility.
The forging material 313 formed into a shape that can be fitted into the side surface forming recess 312d is arranged so as to fit in the side surface forming recess 312d of the forging receiving die 312 with respect to the side surface forming recess 312d. In addition, forging material 313 installed in forging receiving die 312 installed in the forging equipment, forging press die 311 installed in the forging equipment is paired with forging receiving die 312 in the same manner as forging receiving die 312. And place it.

Next, as shown in FIG. 45 (B), the forging die 311 is moved in the direction of the arrow to press the forged material 313, and the forged material 313 is pressed into the space formed by the forging die 311 and the forging receiving die 312. The forging material 313 is forged and deformed. Next, FIG.
As shown in (C), forging die 311 and forging receiving die 312
Is released, and the forged product 314 is taken out.

FIG. 46 shows a step of finishing the forged product manufactured in FIG. 45 into a rotor blank. First, FIG.
As shown in the preliminary processing step (A), in a processing machine such as a lathe (not shown), the center of rotation is assured by the precision of the processing machine from the open side of the thin cylindrical portion 314a of the forged product 314. The forged product 314 is gripped by inserting the inner chuck 317.

Next, the forging projection 319 which is a preliminary structure at the time of forging is deleted by the cutting bit 315 of the lathe in the direction of the arrow. Subsequently, the outer periphery of the rotary shaft holding portion 308d of the cylindrical portion protruding above the reflecting portion is cut by the cutting tool 315 of the lathe in the direction of the arrow. These steps are preparation steps for processing a hole 308c for fitting the rotating shaft 306 shown in FIG. 46 (B), which will be described later. If unnecessary, any cutting processing is omitted. No problem.

Next, as shown in FIG.
The forged product 314 which has been subjected to the preliminary processing in FIG.
It is changed to the outer chuck 318 so as to grip the outer periphery of the cylindrical portion protruding upward from 8a. Subsequently, the forging projection 320, which is a preliminary structure at the time of forging, is deleted by the cutting tool 315 of the lathe in the direction of the arrow. If not necessary, this cutting process can be omitted. Next, the hole 3 for fitting the rotary shaft 306 using the boring tool 316 of the lathe in the direction of the arrow.
08c is formed.

By performing the above steps, FIG.
The rotor blank 321 shown in FIG. The rotor 308, which is a mirror rotor in which the reflecting portion of the rotor blank 321 formed by the above process is mirror-polished, is different from a structure in which a polygon mirror in a conventional polygon scanner is fixed to a polygon mirror support member. The number of components and members is reduced, and there is no need for an advanced measurement method for positioning relative to the polygon mirror and the polygon mirror support member and an assembling process in consideration of fixing accuracy.

Further, since the mirror and the rotor have an integral structure, the centrifugal force and heat caused the high-speed rotation to affect the rotor of the polygon scanner motor with time.
There is no need to worry about positional deviation or deterioration of the surface accuracy shape with respect to the rotation center due to a change in the pressing force of the polygon mirror on the polygon mirror support member.

FIG. 47 shows a process for fitting a rotating shaft to a rotor blank. Rotating shaft gripper 308
d is set on the heat source 322 for shrinkage fitting,
1 is heated, and when the temperature reaches the shrinkage fitting temperature, the rotating shaft 306 is heated.
Insert Conventionally, as a method of fitting the rotating shaft 306, a method of press-fitting the rotating shaft 306 into a polygon mirror supporting member or the like is generally used. However, in the present embodiment, the fitting accuracy of the rotating shaft 306 by shrink fitting with respect to the working accuracy of the hole 308c for the rotating shaft 6 formed in FIG. Since the fitting can be performed without receiving an external force, the center of rotation of the rotor blank 321 and the axis of the rotating shaft 306 are maintained with higher precision than before.

FIG. 48 is a view showing a structure serving as a base of the rotor portion. As shown in FIG. 48, the rotating shaft 3
06 is the rotor 308 fitted to the rotor blank 321
Has a structure serving as a base of the rotor unit 302.

(Next, a case of a polygon mirror blank used for the rotor section of the nineteenth embodiment will be described.)
FIG. 9 is a sectional view showing a rotator unit 302 used in the polygon mirror scanner device according to the nineteenth embodiment. Rotor 40
The configuration is the same as that of the eighteenth embodiment except that the shape of No. 8 is different. As shown in FIG. 49, the rotor 408 used in the polygon mirror scanner of the nineteenth embodiment
The mirror surface 308a is formed on the step.

The manufacturing steps of FIGS. 45 and 46 are similarly applied to the nineteenth embodiment shown in FIG.
In this case, a cutting step is added to the thin cylindrical portion 308b between the vertically divided reflecting portions 308a.

By the way, a polygon scanner motor for driving a polygon mirror to rotate is required to have a higher rotation speed as the technology advances. As the rotation speed increases, the surface state such as the center position accuracy of the polygon mirror with respect to the rotation center of the rotor and the surface accuracy of each reflection surface is required to be high. If the required accuracy is not satisfied, a smooth rotation state cannot be obtained due to the displacement of the center of rotation, the eccentricity, etc., and not only cannot high speed be achieved, but also vibration, noise, line image A variety of problems arise, such as disturbances.

In the conventional method of fixing a polygon mirror by screwing, when a screw is tightened, a variation in tightening torque resulting from a variation in precision of each screw part is unavoidable, and a screw and a washer are required. The increase in the number of points and the necessity of drilling holes in the polygon mirror and tapping holes in the polygon mirror supporting member are required, which causes deterioration of component accuracy. Also, the method of fixing the polygon mirror by pressing the spring eliminates the disadvantage of screwing, but the pressing force on the polygon mirror changes due to the variation in spring constant, the polygon mirror moves if it is weak, and the polygon mirror is deformed if it is strong Will be. In addition, the method of fixing the polygon mirror by bonding causes a large amount of imbalance due to the variation of the application amount, and the scattering of uncured liquid,
It is deformed by the heat generated by rotation and causes imbalance. Further, in the method of fixing the polygon mirror by the interposition of the elastic body, a creep change occurs due to thermal stress, and the holding force is weakened, and the polygon mirror moves.

In the conventional method of fixing a polygon mirror in a polygon mirror and a polygon mirror supporting member, parts and members are required in addition to the polygon mirror and the polygon mirror supporting member. An advanced measuring method for positioning and an assembling process in consideration of fixing accuracy are required, so that it is economically expensive.

The influence of the high-speed rotation on the rotor portion of the polygon scanner motor with time is as follows. As a result of the centrifugal force and heat, the rotation of the polygon mirror with respect to the center of rotation due to a change in the pressing force of the polygon mirror on the polygon mirror support member. There is a possibility that displacement and deterioration of the surface precision shape may occur.

Therefore, according to the manufacturing methods of the eighteenth and nineteenth embodiments, the rod material was cut along a regular polygonal surface from a rod material having a regular polygonal cross section formed by molding a molten aluminum alloy by an extrusion die. The aluminum alloy material is placed in a forging die that can fit into a regular polygon, and the rotor blank with the mirror integrated is formed by forging, so there are few components and members, and the polygon mirror and the polygon mirror support member are relatively small. It is possible to realize a structure in which the mirror and rotor are integrated without the need for an advanced measurement method related to positioning and an assembly process that takes into account fixing accuracy, with a much smaller number of members than turning all from a bar, In addition, since the amount of cutting waste discarded by turning can be suppressed to a great extent, it is advantageous for future environmental problems and the like.

Further, according to the manufacturing methods of the eighteenth and nineteenth embodiments, the rotating shaft is inserted into the rotor blank having the mirror integrated structure by shrink-fitting so that the fitting can be performed without receiving an unexpected external force at the time of fitting. Since the fitting accuracy of the rotating shaft with the machining accuracy of the hole for the rotating shaft can be maintained, the rotation center of the rotor blank and the axis of the rotating shaft are maintained coaxial. In the mirror surface machining method using the rotation axis as the machining reference, the mirror surface is formed at the same distance from the rotation center that is the same as the axis, so there is no eccentricity, and the process for correcting the amount of unbalance is unnecessary, and the rotation The cost for manufacturing the body can be reduced.

Further, according to the polygon mirror having the rotor manufactured by the manufacturing method of the eighteenth and nineteenth embodiments, the polygon scanner having the rotor integrated with the mirror and the rotor is mounted in the rotor structure. Smooth rotation can be continued because there is no fluctuation over time, and if it is installed in an image forming apparatus such as a laser printer, various problems derived from the rotor such as vibration, noise, and disturbance of the line image will occur over time. Can be prevented. Also, even if the stator side including the bearings has reached the end of its life, there is no variation with time, so that it has recyclability and can be reused and remounted.

(Next, the twentieth to twenty-second embodiments of the present invention will be described.) FIG. 50 is a view showing the mirror finishing of the twentieth embodiment, similar to FIGS. 10 and 11, and FIG. And FIG. 52 is an enlarged view of the mirror surface crease by the mirror surface processing of FIG. 50.

An embodiment of mirror processing of the blank structure of the rotor 308 shown in FIG. 48 in FIGS. 50 to 52 will be described below. As shown in FIG. 50, since the main axis 611 of the cutting bit can draw the locus of the cutting without being restricted by the structure of the polygon mirror, the main shaft rotation center line 612 should be arranged on the normal line of the mirror surface. 51 and 52, it is possible to form a uniform crease in the sub-scanning direction on the mirror forming surface as shown in FIGS. In FIG. 50, reference numeral 600 denotes a jig body;
01 is a dividing board, 602 is a positioning shaft, 603 is a positioning block, 604 is a processing jig, 605 is upper and lower pins, 60
6 is a tightening screw, 607 is a receiving block, 608 is a chuck, 609 is a cutting surface, 610 is a cutting tool holder, 61
1 is a spindle cutter, and 612 is a spindle rotation center line.

The above-mentioned mirror finishing method is similarly applied to the rotor 408 shown in FIG. In this case, it is desirable to arrange the spindle rotation center line 612 in the middle of the reflecting portion 308a that is the upper and lower mirror surfaces. Thereby, a substantially uniform crease can be formed. Further, in this case, a cutting step is added to the rotor portion 408 between the vertically reflecting portions 308a.

The mirror / mirror mirror-finished mirror / reflection portion of the mirror / rotor blank formed by the above-described steps is used.
The rotor 308 has a reduced number of components and members compared to a conventional polygon scanner in which a polygon mirror is fixed to a polygon mirror support member, and has an advanced measurement method for positioning relative to the polygon mirror and the polygon mirror support member. There is no need for an assembling process in consideration of the fixing accuracy. In addition, since the mirror and the rotor have an integrated structure, the pressing force of the polygon mirror on the polygon mirror support member due to centrifugal force and heat as an effect that the high-speed rotation exerts on the rotor of the polygon scanner motor over time. It is no longer necessary to be concerned about a displacement or a deterioration of the surface precision shape with respect to the rotation center due to the change of.

A polygon scanner equipped with a rotor constituting a mirror / rotor having a structure in which a mirror and a rotor are integrated can maintain a smooth rotating state because the rotor structure does not fluctuate with time, and can be used as a laser printer. When mounted on an image forming apparatus, various problems derived from the rotor, such as vibration, noise, and disturbance of a line image, can be prevented over time. Also, even if the stator side including the bearings has reached the end of its life, there is no variation with time, so that it has recyclability and can be reused and remounted.

Further, by inserting the rotary shaft into the mirror / rotor blank having a structure in which the mirror and the rotor are integrated, the rotary shaft can be fitted without receiving an unexpected external force at the time of fitting. Since the fitting accuracy of the rotating shaft with respect to the machining accuracy of the hole can be maintained, the rotation center of the mirror / rotor blank and the axis of the rotating shaft are maintained. In the mirror surface machining method using the rotation axis as the machining reference, the mirror surface is formed at the same distance from the rotation center that is the same as the axis, so there is no eccentricity, and the process for correcting the amount of unbalance is unnecessary, and the rotation The cost for manufacturing the body can be reduced.

FIGS. 53 to 57 are views for explaining the twenty-first embodiment. FIG. 53 is a vertical sectional side view of the polygon mirror scanner device of the twenty-first embodiment, and FIG. 54 is an exploded perspective view of a rotor of the polygon scanner of FIG.

As shown in FIG. 53, the polygon scanner 702 includes a magnet 707, a rotor 708b,
A mirror rotor 708 integrally formed with the hole 708 c and the reflecting portion 708 a, a rotating shaft 706, a radial bearing 705 for supporting the rotating shaft 706 on the stator yoke 703,
A thrust bearing 710, a driving coil 704 of a magnetic force generating member fixed to the stator yoke 703 facing the magnet 707, and a control board 709 mounted on the stator yoke 703 are provided.

The mirror rotor 708 has a rotary shaft 706 fixed to a hole 708c which is a central shaft fixing portion, and has a cylindrical rotor portion 708b integrally on an upper surface 708e orthogonal to the reflection surface 708a. The magnet 707 is fixed to the inside of the rotor section 708b by bonding, press-fitting, or the like to form a rotor section. A drive coil 704 facing the magnet 707 at a predetermined distance as the stator portion
Is fixed to the outer periphery of the hollow cylindrical portion of the stator yoke 703, and the outer peripheral cylindrical surface of the drive coil 704 is opposed to the inner peripheral cylindrical surface of the magnet 707 while keeping a constant interval. The drive coil 704 may be fixed to the control board 709.

As described above, according to the configuration in which the side surface of the regular polygon (for example, regular hexagon) integral with the rotor portion 708b is formed as the reflecting surface 708a, the number of parts constituting the rotor is reduced and the number of assembling steps is reduced. Reductions can be made and costs can be reduced. In particular, the mirror rotor 708 can be formed from a high-purity aluminum alloy material, and is lightweight and has excellent dynamic balance. Therefore, it is possible to cope with a high-speed rotation, which is advantageous in reducing vibration and noise.

Next, with reference to FIGS. 55 and 56, an embodiment of a method of manufacturing a blank of a mirror / rotor of a rotator used in the polygon mirror scanner shown in FIG. 53 will be described. FIG. 55 is a longitudinal sectional side view of the rotor of the rotor section used in the polygon mirror scanner device of FIG. However, in this figure, the magnet 707 is not mounted. FIG. 56 is a view showing the shape of a press material for forming a rotor blank used in the polygon mirror scanner device of FIG. 53 in place of the above-described forging, and FIG.
FIG. 2 is a top view of the pressed material, and FIG. 2B is a cross-sectional view of the pressed material.

FIG. 56 shows the shape of a plate material of an aluminum alloy which is a material for forming a blank of the mirror rotor 708. The aluminum alloy plate material (hereinafter, referred to as a plate material) 713 is formed in a regular polygon (in this case, a regular hexagon is formed), and each end face 713b of the plate material 713 is formed after the mirror rotor 708 is formed. Since the mirror finishing process is performed by the cutting process, it is necessary to form the aluminum alloy by a method such as a cutting method from an arbitrary sheet metal material so as not to deform the structure of the aluminum alloy.

FIGS. 57A and 57B are views showing the press working of the press material of FIG. 56, wherein FIG. 57A shows the first press working and FIG. 57B shows the second press work. As shown in FIG. 57 (A), the plate member 713 is set in press dies 714 and 715,
The state which performs press working is shown. FIG. 57 (A)
In the first step, the magnet 70
7 is formed. This figure shows the formed shape after the first-stage press working is performed.

As shown in FIG. 57 (B), FIG.
The plate material 713 after the first stage press working is
6,717, and shows a state where the second stage press working is performed. In FIG. 57B, a portion to which the rotating shaft 706 is attached is formed by the second-stage press working. This figure shows the formed shape after the second-stage press working.

Although not shown, the formed product shown in FIG. 57 (B) after the second-stage press working has a regular polygonal shape. The mirror / rotor 708 is manufactured by gripping the rectangular outer shape and forming a hole 708c for fitting the rotating shaft 706 using a boring tool of a processing machine. Next, the rotating shaft 706 is fitted into the hole 708c of the mirror rotor 708 by means such as shrink-fitting to form the mirror rotor 708 before the mirror surface is formed as shown in FIG.

Note that the rotation shaft 70 is attached to the mirror rotor 708.
The method for fitting 6 can be performed, for example, by the method shown in FIG. 47 described above. FIGS. 50 to 52 show a method and an apparatus for processing the reflecting surface of the reflecting portion 708a of the mirror rotor 708.

From a regular polygonal plate 713 formed from an aluminum alloy plate, the plate 713 is placed in a press mold capable of fitting to the outer shape of the regular polygon of the plate 713, and the mirror / rotor is formed by performing multi-stage press working. Since the blank is molded, the number of components and members is small, and the mirror and rotor are integrated, eliminating the need for an advanced measurement method for positioning relative to the polygon mirror and the polygon mirror support member and the assembly process that takes into account fixing accuracy. Can be realized with a much smaller number of parts than turning all from a bar, and the amount of cutting waste discarded by turning is also greatly reduced. It is advantageous.

Further, by inserting the rotating shaft 706 into the mirror / rotor blank having the structure in which the mirror and the rotor manufactured as described above are integrated by means of shrink fitting, an unexpected external force is generated at the time of fitting. Can be mated without receiving
In addition, since the fitting accuracy of the rotary shaft 706 with respect to the processing accuracy of the rotary shaft hole 708c can be maintained, the rotation center of the mirror / rotor blank and the axis of the rotary shaft 706 are maintained.
In the mirror surface processing method using the rotation axis 706 as a processing reference, since the mirror surface is formed at the same distance from the rotation center that is the same as the axis, there is no eccentricity, and a process for correcting the unbalance amount is unnecessary, The cost required for manufacturing the rotating body can be reduced.

The polygon scanner equipped with a rotor constituting a mirror / rotor having a structure in which the mirror and the rotor manufactured as described above are integrated has a smooth rotating state because the rotor structure does not fluctuate with time. And if mounted on an image forming apparatus such as a laser printer, it is possible to prevent various problems derived from the rotor, such as vibration, noise, and disturbance of a line image, with time. Further, even if the stator side including the bearings has reached the end of its life, there is no variation with time, so that it has recyclability, so that the rotor side can be reused and remounted.

As described with reference to FIG.
Referring to FIG. 59, the cleaning and cleaning of the mirror rotor according to the present invention will be described.
An embodiment in vapor deposition will be described in detail. 58 and 59 are views for explaining the twenty-second embodiment. FIG.
8 is a view for explaining a cleaning method after mirror-cutting for manufacturing the rotor portion of FIG. 42, and FIG.
FIG. 43 is a view for explaining a vapor deposition method after cleaning for manufacturing the rotor unit of FIG. 42.

As described above with reference to FIGS. 10, 11, and 50 to 52, in the mirror cutting, heat generated by the cutting force is included in the cutting tool and the work to be cut, and the life and cutting performance of the cutting tool can be obtained. A cutting fluid is sprayed on the cutting portion for cooling at all times to adversely affect the surface accuracy. Usually, a liquid material containing kerosene is used for the cutting fluid.

For this reason, the mirror rotor after cutting is likely to be exposed to the cutting fluid. However, if the cutting fluid remains in the mirror rotor when performing the vapor deposition process in a later step to protect the mirror surface, the vapor deposition surface will be reduced. In order to cause unevenness or the like, it is necessary to completely clean the surface.

At the time of cleaning, the cleaning is performed while changing the attitude of the mirror / rotor, for example, while rotating in a cleaning tank filled with the cleaning liquid. Since the shape of the mirror rotor has a complicated shape with respect to the inside, it is necessary to perform cleaning with the inside of the mirror rotor opened.

FIG. 58 shows an embodiment at the time of cleaning according to the present invention.
The cleaning jig body 800 is placed in a cleaning tank having a rotation drive mechanism while holding the upper surface of the cleaning jig 8. The cleaning jig main body is driven by the driving force of the cleaning tank via the rotating main shaft 801, the bevel gear 802 fixed to the rotating main shaft 801, and the bevel gear 803 meshed with the bevel gear 802 and attached to the holding portion 804. To each mirror rotor 308
Spin-clean itself. Thereby, the mirror rotor 308
Cleaning can be performed while exposing the internal structure of the device. Note that a bevel gear and the like are not shown for a pair of mirror rotors 308 arranged at the center in FIG.

FIG. 59 is a view showing that a mirror rotor is subjected to a vapor deposition process for protecting the mirror surface after cleaning. FIG.
As shown in FIG. 0, the polygon scanner is configured by the rotary shaft 306 of the rotor unit 302 being rotatably supported by the radial bearing 305 and the thrust bearing 310. However, when a vapor deposition material adheres to the rotary shaft 306 during vapor deposition, sufficient rotation occurs. Performance may not be obtained.

For this reason, as shown in FIG. 59, a collar 854 having a hollow structure is prepared around the rotating shaft so that the rotating shaft 306 is not exposed at the time of vapor deposition, and the rotating shaft 306 is attached to the collar 854 on the surface which does not affect the vapor deposition. Vapor deposition has been achieved by sealing. Therefore, it is possible to prevent a foreign substance such as a deposition substance from attaching to the rotating shaft 306. FIG.
9, reference numeral 850 is a deposition jig main body, reference numeral 851 is a fixed portion, reference numeral 852 is a bearing, reference numeral 853 is a rotating main shaft to which a driving force is transmitted from the deposition pot, and reference numeral 8 is
55 is a press contact part.

In the embodiment of cleaning and vapor deposition shown in FIGS. 58 and 59, an example is shown for a plurality of mirror rotors in order to increase the processing efficiency. Obviously, the number of correspondences can be extended as long as the conditions are met. The expansion of the corresponding number means that the number of mirrors / rotors to be attached to the cleaning jig body (evaporation jig body) is increased according to the cleaning tank (evaporation pot), or the cleaning jig body (evaporation jig body) ) Is to increase the number. The cleaning and vapor deposition methods shown in FIGS. 58 and 59 are similarly applied to the rotor unit 302 shown in FIG.

In the cleaning process of the rotating body, since the inner structure of the integrally structured rotating body is exposed and cleaned, the mirror rotor can be cleaned without an influence of quality fluctuation on the mirror surface of the mirror rotor. Since the quality of the film formed by vapor deposition can be maintained at a high quality, the quality does not fluctuate over time, so that it has recyclability and can be reused for several generations.

Further, in the evaporation process of the rotating body, the rotating shaft of the integrally-structured rotating body is sealed so that the evaporation is performed. Since a deposited film can be formed on the mirror surface portion of the mirror rotor without causing a kimono, the accuracy of the bearing supporting the rotating shaft can be maintained, so that there is no danger of deterioration in rotation quality such as jitter.

Note that the present invention is not limited to the above embodiment. That is, various modifications can be made without departing from the gist of the present invention.

[0239]

As described above, according to the present invention, the number of parts is not increased, high-precision bonding is not required, high durability, easy manufacture, and rotation. It is possible to provide a rotating body that can prevent the occurrence of distortion on the side surface of the body.

Further, according to the present invention, high durability can be obtained without increasing the number of parts, without requiring high-precision bonding,
It is possible to provide a rotary polygon mirror that is easy to manufacture and that can prevent distortion from occurring on the mirror surface.

Further, according to the present invention, high durability can be obtained without increasing the number of parts, without requiring high-precision bonding,
It is possible to provide a rotating unit that is easy to manufacture and that can prevent the occurrence of distortion on the side surface of the rotating body.

Further, according to the present invention, high durability can be achieved without increasing the number of parts, without requiring high-precision bonding,
It is possible to provide a method of processing a rotating body that is easy to manufacture and that can prevent generation of distortion on a side surface of the rotating body.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a polygon mirror scanner device according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing an assembled state of a stator yoke according to the first embodiment.

FIG. 3 is a vertical sectional side view of the rotor according to the first embodiment.

FIG. 4 is a vertical cross-sectional side view showing a situation where a rotary shaft is being press-fitted into a center hole of a rotor according to the first embodiment.

FIG. 5 is a vertical cross-sectional side view showing a situation where the rotor is mounted and fixed on the processing jig according to the first embodiment, and the sliding surface is mirror-finished in a regular polygon in plan view.

FIG. 6A is a vertical sectional side view showing a state in which a plurality of rotors are mounted on a cleaning / evaporating jig, and FIG. 6B shows the cleaning / evaporating jig and a rotor; It is an exploded perspective view.

FIG. 7 is a vertical cross-sectional side view showing a situation where a multi-pole magnet is being press-fitted along the inner periphery of an annular projection of a rotor.

FIG. 8 is a vertical side view of a polygon mirror scanner device according to a second embodiment.

FIG. 9 is a vertical sectional side view of a polygon mirror scanner device according to a third embodiment.

FIG. 10 is a vertical sectional side view of the rotor of the polygon mirror scanner device according to the first embodiment at the time of mirror surface cutting.

FIG. 11 is a state diagram showing penetration of cutting oil.

FIG. 12 is a vertical sectional side view of a rotor of a polygon mirror scanner device according to a fourth embodiment.

FIG. 13A is a longitudinal sectional side view of a rotor of a polygon mirror scanner device according to a fourth embodiment at the time of mirror surface cutting, and FIG. 13B is a state diagram in a case where cutting oil has penetrated; is there.

FIG. 14 is a longitudinal sectional side view of a rotor of a polygon mirror scanner device according to a fifth embodiment.

FIG. 15 is a longitudinal sectional side view of a rotor of a polygon mirror scanner device according to a sixth embodiment.

FIG. 16 is a longitudinal sectional side view of a rotor of a polygon mirror scanner device according to a seventh embodiment.

FIG. 17 is a diagram showing that the influence of the centrifugal force of the magnet on the mirror surface during high-speed rotation of the polygon mirror scanner device according to the first embodiment is prevented.

FIG. 18 is a vertical sectional side view of a polygon mirror scanner device according to an eighth embodiment of the present invention.

FIG. 19 is a perspective view of a rotor portion.

FIG. 20A is a bottom view showing a modification of the projection of the polygon mirror, and FIG. 20B is a bottom view showing another modification of the projection.

FIG. 21 is a vertical sectional side view of a polygon mirror scanner device according to a ninth embodiment.

FIG. 22 is a vertical sectional side view of the polygon mirror scanner device according to the tenth embodiment.

FIG. 23 is a vertical sectional side view of the polygon mirror scanner device according to the eleventh embodiment.

FIG. 24 is a vertical sectional side view of a polygon mirror scanner device according to a twelfth embodiment.

25A and 25B are diagrams illustrating a mirror surface processing of a modified example of the polygon mirror, wherein FIG. 25A illustrates a state in which polygon mirror blanks before mirror surface processing are stacked, and FIG. 25B illustrates a state in which the stacked polygon mirrors are fixed; .

FIG. 26 is a diagram showing mirror finishing of another modification of the polygon mirror.

FIG. 27 is an enlarged view of the main part.

FIG. 28 is a vertical sectional side view of a polygon mirror scanner device according to a thirteenth embodiment of the present invention.

FIG. 29 is a perspective view of a rotor part.

FIG. 30A is a bottom view showing a modification of the projection of the polygon mirror, and FIG. 30B is a bottom view showing another modification of the projection.

FIG. 31 is a longitudinal sectional side view of a polygon mirror scanner device according to a fourteenth embodiment.

FIG. 32 is a longitudinal side view of a polygon mirror scanner device according to a fifteenth embodiment.

FIG. 33 is a vertical sectional side view of a polygon mirror scanner device according to a sixteenth embodiment.

FIG. 34 is a longitudinal sectional side view of a polygon mirror scanner device according to a seventeenth embodiment.

FIG. 35 is a diagram showing mirror finishing of a polygon mirror;
(A) shows a state where polygon mirror blanks before mirror finishing are stacked, and (B) shows a state where the stacked polygon mirror blanks are fixed.

36 (A) and 36 (B) are views showing mirror finishing of another modified example of the polygon mirror, wherein FIG. 36 (A) shows a state in which polygon mirror blanks before mirror processing are stacked, and FIG. 36 (B) shows a state in which the stacked polygon mirror is fixed. Is shown.

FIGS. 37A and 37B are views showing mirror finishing of another modified example of the polygon mirror. FIG. 37A shows a state in which polygon mirror blanks before mirror processing are stacked, and FIG. 37B shows a state in which the stacked polygon mirrors are fixed. Is shown.

FIG. 38 is a diagram showing mirror finishing of another modification of the polygon mirror.

FIG. 39 is an enlarged view of the main part.

FIG. 40 is a vertical sectional side view of the polygon mirror scanner device according to the eighteenth embodiment.

FIG. 41 is an exploded perspective view of a rotor unit used in the same device.

FIG. 42 is a cross-sectional view of a rotor section used in the same device.

FIG. 43 is a view showing a shape of a forging die for manufacturing a rotor blank according to the present invention, (A) is a bottom view of the forging die, and (B) is a sectional view of the forging die. ,
(C) is a top view of the forged receiving die, and (D) is a cross-sectional view of the forged receiving die.

FIG. 44 is a view showing a shape of a forged material for manufacturing a rotor blank according to the present invention, (A) is a top view of the forged material, and (B) is a sectional view of the forged material.

FIG. 45 is a diagram showing a manufacturing process by forging for manufacturing a rotor blank according to the present invention.

FIG. 46 is a diagram illustrating a step of finishing the forged product manufactured in FIG. 45 into a rotor blank.

FIG. 47 is a diagram showing a process for fitting a rotating shaft to the rotor blank manufactured in FIG. 46;

FIG. 48 is a diagram showing a structure serving as a base of the rotor unit manufactured in the step of FIG. 46;

FIG. 49 is a sectional view showing a rotator used in the polygon mirror scanner of the nineteenth embodiment.

FIG. 50 is a diagram showing mirror finishing of the twentieth embodiment;

FIG. 51 is a diagram continuously showing the trajectory of the cutting tool in the mirror finishing of the twentieth embodiment.

FIG. 52 is an enlarged view showing a crest of a mirror surface by mirror surface processing of the twentieth embodiment.

FIG. 53 is a vertical sectional side view of a polygon mirror scanner device according to a twenty-first embodiment.

FIG. 54 is an exploded perspective view of a rotor unit used in the same device.

FIG. 55 is a longitudinal side view of a rotor of a rotor section used in the same device.

FIG. 56 is a view showing a shape of a press material for forming a rotor blank used in the apparatus, (A) is a top view of the press material, and (B) is a cross-sectional view of the press material.

57A and 57B are views showing press working of the press material of FIG. 56, wherein FIG. 57A shows a first-stage press work and FIG. 57B shows a second-stage press work.

FIG. 58 is a view illustrating a cleaning method after mirror finishing for manufacturing the rotor unit of FIG. 42;

FIG. 59 is a view for explaining an evaporation method after cleaning for manufacturing the rotor unit of FIG. 42;

FIG. 60 is a sectional view showing a conventional polygon mirror scanner unit.

FIG. 61 is a sectional view showing another conventional scanner motor for driving a polygon mirror.

FIG. 62 is a cross-sectional view showing another conventional polygon mirror scanner unit.

FIG. 63 is a diagram showing another conventional polygon mirror rotor.

FIG. 64 is a cross-sectional view showing another conventional polygon mirror scanner unit.

FIG. 65 is a view showing another conventional polygon mirror rotor.

FIG. 66 is a front view showing the mirror surface processing of the conventional polygon mirror, and the right half is a side view showing the same.

FIG. 67 is an enlarged view showing a crest of a mirror surface formed by the mirror surface processing shown in FIG. 66;

[Explanation of symbols]

 13 Stator Yoke 16b Mirror Surface 16c Thin Cylindrical Portion 16d Lower Bottom 16e Upper Bottom 17 Rotating Axis 18 Multipole Magnet 21 Recess 116h Annular Groove

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Bunto 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (72) Koji Tsukahara 1-3-6 Nakamagome, Ota-ku, Tokyo In Ricoh Co., Ltd. (72) Inventor Kazushi Honda 1-3-6 Nakamagome, Ota-ku, Tokyo F-term in Ricoh Co., Ltd. 2C362 BA08 BA09 DA09 2H045 AA07 AA14 AA15 AA62 5C072 AA03 BA13 DA21 HA13 XA01 XA05 5H607 AA12 BB09 BB14 BB17 BB25 CC05 FF12 GG01 GG09

Claims (19)

[Claims] 1. A rotating body having a plurality of surfaces on a side surface, wherein: an element required for the rotating body to rotate; and the element is press-fitted and a stress generated at the time of press-fitting is applied to the side portion. Mounting means for preventing transmission of the rotating body to the rotation axis of the rotating body from the side surface portion, the mounting means being integrated with a first orthogonal surface portion orthogonal to the side surface portion. A rotating body disposed coaxially with the rotating shaft. 2. The mounting means has a protruding shape coaxial with a rotation axis of the rotating body, and the mounting means is fitted on a second orthogonal surface portion facing the first orthogonal surface portion across the side surface portion. The rotating body according to claim 1, further comprising a fitting means that can be fitted. 3. The rotating body according to claim 1, wherein said mounting means has a substantially cylindrical thin shape. 4. The mounting means disposes the element on an inner peripheral surface thereof, and an outer peripheral surface of the mounting means is a slope inclined toward a center of the rotation axis from a boundary with the first orthogonal plane portion. The rotating body according to claim 3, wherein: 5. The device according to claim 1, wherein the element is disposed on an inner peripheral surface of the mounting means, and the first orthogonal surface portion and an element end surface facing the first orthogonal surface portion are separated from each other. Item 4. The rotating body according to Item 3. 6. The element is arranged on an inner peripheral surface of the mounting means so that the mounting means is displaced in a boundary region between the mounting means and the first orthogonal plane portion by rotation of the rotating body. The rotating body according to claim 3, wherein: 7. A concave portion is formed at a central portion of the first orthogonal surface portion toward a second orthogonal surface portion facing the first orthogonal surface portion, and a through hole for attaching a rotating shaft is formed in the concave portion. The rotating body according to claim 1, further comprising: 8. A side surface portion having a plurality of mirror surfaces formed at equal intervals in a circumferential direction, a first orthogonal surface portion orthogonal to the side surface portion, and the first orthogonal surface portion with the side surface portion interposed therebetween. A rotary polygon mirror having a mirror surface forming portion having a second orthogonal surface portion facing the first orthogonal surface portion, a thin cylindrical portion integrated with the first orthogonal surface portion, and a substantially cylindrical shape coaxial with a rotation axis of the rotary body polygon mirror. An inner peripheral surface of the thin cylindrical portion, and an outer peripheral surface of the thin cylindrical portion formed closer to the rotation axis than the side surface portion, and a magnet is press-fitted into the inner peripheral surface. A rotary polygon mirror, wherein the thin cylindrical portion can be displaced in the vicinity of a boundary region between the first orthogonal surface portion and the thin cylindrical portion by a press input. 9. A fitting according to claim 8, further comprising a fitting portion formed on the second orthogonal surface portion and having substantially the same shape as an end portion of the thin cylindrical portion. Rotating polygon mirror. 10. The rotary polygon mirror according to claim 9, wherein the fitting portion has a groove shape. 11. A projecting portion is formed on the second orthogonal surface portion, and a side surface of the projecting portion along an axial direction contacts at least one of an outer peripheral surface and an inner peripheral surface of the thin cylindrical portion,
9. The rotary polygon mirror according to claim 8, wherein said outer peripheral surface or said inner peripheral surface is formed to have substantially the same surface shape as said contact surface. 12. The rotary polygon mirror according to claim 8, wherein the outer peripheral surface is inclined toward the axial center from the boundary region toward a tip of the thin cylindrical portion. 13. A space region portion is provided between an end of the magnet mounted on the inner peripheral surface on a first orthogonal surface side and the first orthogonal surface. 2. The rotary polygon mirror according to 1. 14. A side surface portion having a plurality of mirror surfaces formed at equal intervals in a circumferential direction, and a first side surface orthogonal to the side surface portion.
A rotating polygon mirror having a mirror surface forming portion having a second orthogonal surface portion opposed to the first orthogonal surface portion with the side surface portion interposed therebetween, a magnet mounted on the rotating polygon mirror, A main body having a yoke opposed to a magnet, and a rotating shaft fixed to the main body or the rotating polygon mirror, wherein the magnet and the yoke act on the main body around the rotating shaft. In the rotary unit on which the rotary polygon mirror rotates, a thin cylindrical portion integrally formed with the first orthogonal surface portion; and a thin cylindrical portion formed in a substantially cylindrical shape coaxial with a rotation axis of the rotary polygon mirror. An inner peripheral surface, an outer peripheral surface of the thin cylindrical portion formed closer to the rotation axis than the side surface portion, and a yoke attached to the main body so as to face an inner peripheral surface of the magnet. The inner circumference Rotation unit by press-fitting force at the time of press-fitting the magnet, wherein the thin-walled cylindrical part is a displaceable border region near said thin cylindrical portion and the first orthogonal surface portion. 15. A method for processing a rotating body having a plurality of surfaces on a side surface portion, wherein an inner peripheral surface has a cylindrical shape, and an element required for the rotating body to rotate is orthogonal to the side surface portion. A rotating shaft for rotating the rotating body is mounted on the center of the rotating body by press-fitting into an element mounting portion integrally formed on the orthogonal plane, and a rotating body mounted with such an element and the rotating shaft is A method of processing a rotating body, comprising: providing a plurality of stacked, collars between adjacent rotating bodies to be fitted to an outer peripheral surface of the element mounting portion; and simultaneously processing side surfaces of the plurality of rotating bodies. 16. The stack of a plurality of rotating bodies, wherein each side surface of each rotating body is aligned, and the processing is mirror finishing.
The method for processing a rotating body according to item 1. 17. The method according to claim 15, wherein the processing is thin film formation or cleaning. 18. The method for processing a rotating body according to claim 15, wherein the rotating body is formed by press working. 19. The method according to claim 17, wherein the cleaning is performed by exposing an inner structure of the rotating body.