JP4651548B2 - Optical deflection scanning device manufacturing method, optical deflection scanning device, and image forming apparatus - Google Patents

Description

  The present invention relates to an optical deflection scanning device, an image forming apparatus including the optical deflection scanning device, and a manufacturing method thereof. The present invention relates to a method and apparatus for dispensing.

The photosensitive drum is irradiated with a laser beam irradiated from a light source and deflected by a polygon mirror, and an electrostatic latent image is written on the photosensitive drum. At this time, if the irradiated laser beam is not written at a predetermined position at a predetermined angle, an adverse effect such as distortion of the formed image occurs. In order to irradiate the laser beam to a predetermined position at a predetermined angle, it is important to eliminate the inclination of the polygon mirror with respect to the photosensitive drum.
JP-A-6-75184

In a conventional general optical deflection scanning apparatus, a polygon motor that rotationally drives a shaft that fixes a polygon mirror is often fixed to a fixed portion such as a metal plate.
However, the fixed portion to which the polygon motor as described in Patent Document 1 is fixed is subjected to “sludge” due to residual stress when being pressed. For this reason, the polygon motor attached to the fixed portion is inclined, and as a result, the polygon mirror fixed to the shaft rotated by the polygon motor is inclined, and the laser beam applied to the photosensitive drum is preliminarily applied. There is a problem that it is difficult to irradiate a predetermined position at a predetermined angle.
In the present invention, the polygon motor that rotates the shaft that fixes the polygon mirror is fixed by removing the “warp” generated during the pressing process by pressing the fixed part of the polygon motor and then performing dimple processing. The “warping” of the fixed part can be reduced.
That is, it is possible to provide a method of manufacturing an optical deflection scanning device for reducing the inclination of the polygon mirror with respect to the photosensitive drum.

That is, the present invention is basically an optical deflection scanning means for deflecting and scanning light, a rotational driving means for rotationally driving a shaft fixed to the optical deflection scanning means, and a metal plate for fixing the rotational driving means. The present invention relates to a method of manufacturing an optical deflection scanning device including a fixed portion. In order to achieve the above object, in the present invention, after the fixing portion is pressed, a plurality of protrusions are pressed by pressing a plurality of convex portions on the surface or both surfaces of the fixed driving portion on which the rotation driving means is provided. Are formed. This process is called a dimple formation process.
By the dimple formation process, it is possible to eliminate the “warping” generated during the pressing process, and to reduce the inclination of the fixed portion to which the rotation driving means of the light deflection scanning means is fixed.
Even if a plurality of recesses are formed, the above-mentioned “sledge” cannot be eliminated by a method such as cutting. It is important that the process is performed by pressing a plurality of convex portions as described above.
Moreover, it is preferable that the dimple formation step forms a recess in addition to the portion in contact with the rotation driving means.
This is because if the concave portion is formed in the portion of the fixed portion that comes into contact with the rotational drive means, the rotational drive means may be inclined due to the concave portion of the portion of the fixed portion that comes into contact with the rotational drive means.
Further, it is conceivable that the rotation driving means is supported by a protrusion formed on the fixed portion.
If the area where the fixed part and the rotation driving means of the fixing part are in contact with each other is wide, when a recess is formed in a portion other than the part in contact with the rotation driving means, the area where the recess is not formed becomes large, and the warp due to the formation of the recess is eliminated. This is because the effect cannot be expected. For this reason, a protrusion is formed on the fixed part to reduce the contact area between the fixed part and the rotation driving means.
Further, it is preferable that the dimple formation step is to form a plurality of recesses having a size of about 0.5 mm and a depth of about 0.3 mm at intervals of about 1.5 mm on the surface or both surfaces of the fixed portion where the rotation driving means is provided. .
Here, the size of the concave portion is a diameter if the concave portion is substantially circular, a long diameter or a short diameter if the concave portion is substantially elliptical, and a diagonal length if the concave portion is substantially rectangular. It is conceivable that the length or the length of the long side or the length of the short side.
If the concave portion as described above is formed in the fixing portion, the warpage of the fixing portion can be eliminated.
On the other hand, when the present invention is applied to the apparatus, the optical deflection scanning means for deflecting and scanning the light, the rotational driving means for rotationally driving the shaft fixed to the optical deflection scanning means, and the rotational driving means are fixed. An optical deflection scanning device including a fixed portion that is a metal plate, wherein the fixed portion is a plate-like member having a plurality of concave portions formed on a surface or both surfaces on which the rotation driving means is provided. A characteristic light deflection scanning device is conceivable.
Since the fixed portion is a plate-like member having a plurality of recesses formed on the surface or both surfaces on which the rotation driving means is provided, the “warping” generated during pressing is eliminated, and the light changing scanning means is It is possible to reduce the inclination of the fixed portion to which the rotation driving means for rotating the fixed shaft is fixed. Accordingly, in such an optical deflection scanning device, the inclination of the light changing scanning means is reduced, so that the laser beam irradiated from the light source and deflected by the light changing scanning means is inclined by the warp of the fixed portion. There is no.
Further, an image forming apparatus provided with the light deflection scanning device as described above can be considered.
In the image forming apparatus provided with the light deflection scanning device as described above, since the inclination of the light changing scanning means is reduced, the laser beam emitted from the light source and deflected by the light changing scanning means is the fixed portion. Since the image carrier is irradiated without being tilted by the warp, an appropriate electrostatic latent image is written on the image carrier and a fine image can be formed.

  According to the present invention, it is possible to provide a method of manufacturing an optical deflection scanning device in which the inclination of a polygon mirror is reduced with respect to a photosensitive drum and distortion of an image to be formed is small.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that the present invention can be understood. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.
1 is a sectional view of the image forming apparatus X1 according to the embodiment of the present invention. FIG. 2 is an optical path M from the polygon mirror 14 to the photosensitive drum 37 of the image forming apparatus X1 according to the embodiment of the present invention. FIG. 3 is a perspective view of the laser scanner unit L1 of the image forming apparatus X1 according to the embodiment of the present invention, FIG. 4 is a cross-sectional view taken along the line P-P ′ of FIG. FIG. 5 is a schematic diagram of the polygon mirror 14 and the polygon motor fixing portion, and FIG. 6 is a schematic diagram for explaining the shape of the recess formed in the polygon motor fixing portion 18.

First, the schematic configuration of the image forming apparatus X1 according to the embodiment of the present invention will be briefly described with reference to the cross-sectional view of FIG.
As shown in FIG. 1, the image forming apparatus X1 is roughly divided into a sheet feeding unit K, an image forming unit G, and a fixing unit T.
The paper feed unit K is provided below the main body of the image forming apparatus X1 and includes a paper feed cassette 30 that stores a plurality of recording papers of a predetermined size, and a supply of the recording paper stored in the paper feed cassette. A paper feed roller 32 for feeding paper, a separation roller 33 (separation rollers 33-1 and 33-2) for separating the recording paper fed by the paper feed roller 32, and the paper feed cassette 30 are not above. A manual feed tray 31 that feeds regular recording paper, a manual feed roller 34 that feeds the recording paper placed on the manual feed tray 31, the separation roller 33, and the manual feed roller 34. An intermediate conveyance roller 35 that conveys the conveyed recording paper, a registration roller 36 (registration rollers 36-1 and 36-2), and a paper feed motor (not shown) that rotationally drives each of the rollers.
The registration roller 36 is a roller that conveys the recording paper so that the leading end portion (image formation start portion) of a toner image formed on the surface of the photosensitive drum 37 described later is synchronized with the leading end portion of the recording paper.

  The image forming unit G includes a photosensitive drum 37 that carries an electrostatic latent image, a charging unit that uniformly charges the surface of the photosensitive drum 37, and a laser beam applied to the photosensitive drum 37. A laser scanner unit L1 for forming an electrostatic latent image; a developing portion Z for forming a toner image on the surface of the photosensitive drum 37 by attaching toner contained in a developer to the electrostatic latent image; A cleaning unit for cleaning the photosensitive drum 37, a neutralizing unit for removing a potential remaining on the photosensitive drum 37 after transfer, and a developing roller described later provided in the photosensitive drum 37 and the developing unit Z 39, a supply roller 40 and a stirring roller 41 are provided to rotate the drum motor (not shown).

As shown in FIG. 3, the laser scanner unit L1 includes an LD substrate 11 that is a substrate including a light emitting element, a collimator lens 12 that converts a laser beam emitted from the LD substrate 11 into a substantially parallel light beam, A cylindrical lens 13 which is a lens having a predetermined refractive power only in the scanning direction, a polygon mirror 14 which is a regular hexagonal rotary polygon mirror having six deflection surfaces (reflection surfaces) on the side surface, and the polygon mirror 14 are fixed. A shaft 15, a polygon motor 16 (see FIG. 4) that rotates the shaft 15, a circuit board 17 that controls the driving of the polygon motor 16, and a metal (for example, aluminum) plate that fixes the polygon motor 16. A laser beam reflected by a polygon motor fixing unit 18 and the polygon mirror 14 is condensed, and the photosensitive drum driver is collected. A scanning lens 19 (19-1, 19-2) that is an Fθ lens that forms an image on the lens 37, a reflection mirror 20 that reflects the laser beam collected by the scanning lens 19 and leads it to the photosensitive drum, and a synchronization detection sensor BD (beam detector) detection sensor 21 and a housing 22 which is a box-like structure containing these components.
The LD substrate 11 irradiates a laser beam light-modulated based on image data obtained by image processing of an image signal input from an information processing device connected to the image forming apparatus X1.
The cylindrical lens 13 condenses the laser beam in a linear shape on the reflection surface of the polygon mirror 14.
The polygon mirror 14 reflects the light collected by the cylindrical lens 13. The polygon mirror 14 is fixed to the shaft 15. The shaft 15 and the polygon mirror 14 fixed to the shaft 15 are rotated in a predetermined direction at a predetermined speed when the polygon motor 16 rotates the shaft 15. The polygon mirror 14 is an example of a light deflection scanning unit.
The polygon motor 16 is an example of rotation driving means.
The BD detection sensor 21 receives a laser beam, detects a BD signal (synchronization signal) from the output signal of the BD detection sensor 21, and records an image on the surface to be scanned (photosensitive drum 37 surface) based on the BD signal. Adjust the scan start timing.
The polygon motor fixing unit 18 is an example of a fixing unit.

  The developing section Z includes a developing roller 39 that carries the developer on the surface, a supply roller 40 that agitates the developer and supplies the developer to the developing roller 39, and a developer that agitates the developer and supplies the developer to the supply roller 40. An agitation roller 41 for supplying the developer, a developer replenishing port 42 which is an inlet for supplying the developer, a developer accommodating portion 43 for accommodating the developer, and the toner accommodated in the developer accommodating portion 43 as the developer. A conveyance roller 44 that conveys to the replenishing port is provided.

Next, an image forming process executed by the image forming apparatus X1 will be briefly described.
When a user performs an image output operation from an information processing apparatus such as a personal computer that is communicably connected to the image forming apparatus X1, the recording paper stored in the paper feed cassette 30 is transferred to the paper feed. The paper is fed by the roller 32 and separated one by one by the separation roller 33. The recording paper separated by the separation roller 33 is conveyed to the registration roller 36 by the intermediate conveyance roller 35. The recording sheet conveyed by the intermediate conveyance roller 35 is further conveyed to the image formation start position by the registration roller 36.
On the other hand, when an image is formed on an irregular recording paper or the like, paper is fed by the manual feed tray 31. When a user performs a predetermined operation from the information processing apparatus, the recording paper placed on the manual paper feed tray 31 is fed by the manual paper feed roller 34, and the intermediate transport roller 35 performs the above operation. It is conveyed to the registration roller 36. The recording sheet conveyed by the intermediate conveyance roller 35 is further conveyed to the image formation start position by the registration roller 36.

When the user performs an image output operation on the information processing apparatus, an image information signal (digital image data) is transmitted from the information processing apparatus to the image forming apparatus X1. The transmitted image information signal is subjected to predetermined image processing in the image forming apparatus X1 and input to the laser scanner unit L1. When an image information signal is input to the laser scanner unit L1, the LD substrate 11 emits a laser beam light-modulated based on the image information signal. The laser beam emitted from the LD substrate 11 is made into a substantially parallel light beam by the collimator lens 12 and collected linearly on the deflection surface (reflection surface) of the polygon mirror 14 by the cylindrical lens 13.
Then, the laser beam deflected and reflected by the deflecting surface of the polygon mirror 14 is reflected by the reflecting mirror 20 through the scanning lens 19 and applied to the photosensitive drum 37, whereby an electrostatic latent image is formed. Written. The optical path M of the laser beam is shown in FIG. Further, the BD detection sensor 21 detects the laser beam immediately before the laser beam is deflected and reflected by the deflection surface of the polygon mirror 14 and applied to the photosensitive drum 37, and the scanning start timing is adjusted.

The toner conveyed from the developer container 43 through the developer replenishment port 42 by the conveying roller 44 in the developing unit Z is rotated by the agitation roller 41 by the drum motor. To be supplied. The supply roller 40 is rotated by the drum motor to supply toner to the developing roller 39.
Subsequently, the developing roller 39 is rotated by a drum motor, and a thin layer of toner formed on the surface of the developing roller 39 contacts the surface of the photosensitive drum 37. The photosensitive drum 37 is rotated by the drum motor in synchronization with the rotation of the developing roller 39. As a result, the charged toner adheres to the electrostatic latent image on the surface of the photosensitive drum 37 to form a toner image. The photosensitive drum 37 is continuously rotated by the drum motor, and the toner image is transferred onto the recording paper conveyed by the registration roller 36 by a transfer roller pressed against the photosensitive drum 37. A cleaning unit is disposed downstream of the transfer roller in the rotation direction of the photosensitive drum 37, and toner and other deposits remaining on the surface of the photosensitive drum 37 are removed. A neutralization unit is provided on the downstream side of the cleaning unit in the rotation direction of the photosensitive drum 37, and potential remaining on the photosensitive drum 37 is removed. The toner image transferred to the recording paper is heated by the fixing roller of the fixing unit T and fixed on the recording paper.

As described above, the laser beam irradiated from the LD substrate 11 serving as the light source and deflected and reflected by the deflecting surface of the polygon mirror 14 is reflected by the reflecting mirror 20 through the scanning lens 19 and irradiated to the photosensitive drum 37. As a result, an electrostatic latent image is written on the photosensitive drum 37. At this time, if the irradiated laser beam is not written at a predetermined position at a predetermined angle, an adverse effect such as distortion of the formed image occurs. In order to irradiate the laser beam to a predetermined position at a predetermined angle, it is important to eliminate the inclination of the polygon mirror 14 with respect to the photosensitive drum 37.
FIG. 2 is a schematic diagram for explaining an optical path M through which a laser beam passes from the polygon mirror 14 to the photosensitive drum 37 of the laser scanner unit L1.
As shown in FIG. 2, the polygon motor 16 is fixed to the polygon motor fixing portion 18. When the polygon motor fixing portion 18 is tilted, the polygon motor 16 fixed to the polygon motor fixing portion 18, the shaft 15 driven to rotate by the polygon motor 16, and the polygon mirror 14 fixed to the shaft 15 are added. An inclination will occur.
The polygon motor fixing portion 18 is a metal plate such as aluminum and is molded by pressing. Then, the “sledge” is generated due to the residual stress generated during the press working. When a metal plate in which "warping" is generated is used as the polygon motor fixing portion 18, the polygon motor fixing portion 18 is inclined. As a result, the polygon mirror 14 is inclined, and the optical path in FIG. M is distorted. That is, it becomes difficult to irradiate the laser beam irradiated onto the photosensitive drum 37 at a predetermined position at a predetermined angle, resulting in image distortion.
In the present invention, after the polygon motor fixing portion 18 is pressed, a plurality of convex portions are pressed to form a plurality of concave portions (so-called dimples) in the polygon mirror fixing portion 18. By performing the dimple processing in this way, the “warp” generated during the press processing is eliminated, and the polygon motor fixing portion 18 to which the polygon motor 16 for rotating the shaft 15 fixing the polygon mirror 14 is fixed. This is to reduce the inclination of.

The fixing structure of the polygon motor 16 will be described with reference to FIGS.
FIG. 5A is a schematic diagram showing a state in which the polygon mirror 14, the shaft 15, the polygon motor 16, and the circuit board 17 are fixed to the polygon motor fixing unit 18. FIG. 5B is a schematic diagram of the polygon motor fixing unit 18 alone.
In this case, the polygon motor 16 is fixed to the polygon motor fixing portion 18 via the circuit board 17. However, the one that directly fixes the polygon motor 16 to the polygon motor fixing portion 18 also belongs to the scope of the present invention.
As shown in FIG. 4, the polygon mirror 14 has a regular hexagonal center fixed to the shaft 15. A protrusion F is formed on the lower surface of the polygon motor 16 that rotationally drives the shaft 15.
As shown in FIG. 5A, the circuit board 17 is rectangular. Holes C1, C2, C3, and C4 are formed at four corners of the circuit board 17.
The polygon motor fixing portion 18 is a plate-like member as shown in FIG. The polygon motor fixing portion 18 is formed with a hole A into which the protrusion F formed on the polygon motor 16 is inserted. Further, screw holes B1 and B2 are formed in the polygon motor fixing portion 18 at the end of the scanning lens 19 side (P1 direction in FIGS. 3 and 5) from the hole A. Further, screw holes B3 and B4 are formed at the end of the housing 22 side (P2 direction in FIGS. 3 and 5) from the hole A. In addition to the screw holes B1, B2, B3, B4, a plurality of holes G (G1 to G10) for fixing the polygon motor fixing portion 18 to the housing 22 are formed.
The protruding portion F of the polygon motor 16 passes through the circuit board 17 and is inserted into the hole A formed in the polygon motor fixing portion 18.
A screw is inserted into the screw hole B1 through the hole C1, into the screw hole B2 through the hole C2, into the screw hole B3 through the hole C3, and into the screw hole B4 through the hole C4. The circuit board 17 is fixed to the polygon motor fixing portion 18 by being screwed respectively.
In this way, the polygon mirror 14, the shaft 15, the polygon motor 16, and the circuit board 17 are fixed to the polygon motor fixing portion 18. As shown in FIGS. 4 and 5, the screw N1 is formed in the screw hole formed in the housing 22 through the hole G1, and the screw N2 is formed in the screw hole formed in the housing 22 through the hole G2. A screw N3 is inserted into a screw hole formed in the casing 22 through a hole G3, a screw N4 is inserted into a screw hole formed in the casing 22 through a hole G4, and a screw N4 is inserted into the casing through the hole G4. A screw N5 is screwed into a screw hole formed in the housing 22 through a hole G5. The screws N1 to N5 are screwed from below to above in FIG. In this way, the polygon motor fixing portion 18 to which the polygon motor 16 and the like are fixed is assembled and fixed to the casing 22.

The polygon motor fixing portion 18 is manufactured by press work before the polygon mirror 14 or the like is fixed and assembled to the housing 22. Here, the process in which the polygon motor fixing portion 18 is pressed and molded corresponds to an example of a pressing process.
Subsequently, the pressed polygon motor fixing portion 18 has a plurality of concave portions formed by pressing a plurality of convex portions on the surface or both surfaces to which the circuit board 17 to which the polygon motor 16 is fixed is passed. Formation (dimple processing) is performed. Here, a step of pressing a plurality of convex portions on the surface or both surfaces of the press-processed polygon motor fixing portion 18 on which the circuit board 17 on which the polygon motor 16 is fixed is formed to form a plurality of concave portions. This corresponds to an example of a dimple formation process.
A concave portion may be formed on the entire surface of the polygon motor fixing portion 18 on which the circuit board 17 to which the polygon motor 16 is fixed is passed, but the polygon motor 16 is fixed through the surface. It is desirable that a concave portion is formed (dimple processing) in a portion (shaded portion D1 in FIG. 5B) other than the portion where the circuit board 17 and the polygon motor fixing portion 18 are in contact with each other. This is because if the concave portion is formed in a portion where the circuit board 17 and the polygon motor fixing portion 18 are in contact with each other, the circuit board 17 may be inclined due to the concave portion or a burr or a bulge caused by the concave portion. It is.
The concave portion formed in the polygon motor fixing portion 18 will be described in detail.
6A is a schematic view of a plurality of concave portions formed in the polygon motor fixing portion 18 as viewed from the opening side direction, and FIG. 6B is an enlarged cross-sectional view of the concave portions formed in the polygon motor fixing portion 18. It is.
For example, as shown in FIG. 6, the concave portion formed in the polygon motor fixing portion 18 has a substantially circular shape with an opening having a diameter of about 0.5 mm, and a concave portion having a depth of about 0.3 mm is about 1 mm. It is preferable to form at intervals of 5 mm. However, the present invention is not limited to this, and the opening may be substantially elliptical or rectangular.

Thus, a plurality of concave portions are formed by pressing the plurality of convex portions on the pressed polygon motor fixing portion 18. As a result, the “warp” generated during the press working is eliminated and the polygon motor fixing portion 18 becomes flat. Therefore, when assembled to the housing 22, the assembly is performed as designed, and the photosensitive drum 37. In contrast, the polygon mirror 14 is not inclined.
That is, it is possible to provide the image forming apparatus X1 including the laser scanner unit L1 with high accuracy of light deflection and less distortion of the formed image.

In the following embodiment, the circuit board 17 is fixed in contact with the protrusion H formed on the polygon motor fixing portion 118 for fixing the polygon mirror 14 and the polygon motor 16 of the laser scanner unit of the image forming apparatus. .
If the area (E1 in FIG. 5) where the polygon motor fixing portion 18 and the circuit board 17 of the laser scanner unit L1 are in contact with each other is large as in the image forming apparatus X1, a plurality of protrusions are formed in addition to the portion in contact with the circuit board 17. When a plurality of recesses are formed by pressing the part, the area where the recesses are not formed becomes wide, and it may not be possible to eliminate “warping” caused by press working. Therefore, in this embodiment, the projections H are provided on the polygon motor fixing part 118, the area where the polygon motor fixing part 118 and the circuit board 17 are brought into contact with each other is reduced, and a plurality of concave parts are formed by pressing the plurality of convex parts. In other words, the “sledge” generated by press working is eliminated by increasing the area to be pressed.
First, the difference between the image forming apparatus used in this embodiment and the image forming apparatus X1 according to the above embodiment will be described with reference to the schematic diagram of FIG.
FIG. 5C is a schematic diagram showing a state in which the polygon mirror 14, the shaft 15, the polygon motor 16, and the circuit board 17 are fixed to the polygon motor fixing unit 118. The same parts as those in FIG. 5A of the above embodiment are denoted by the same reference numerals, and description thereof is omitted.
FIG. 5D is a schematic diagram of the polygon motor fixing unit 118 alone.
As shown in FIG. 5D, an annular protrusion H (H1, H2, H3, H4) is formed on the polygon motor fixing portion 118 provided in the laser scanner unit of the image forming apparatus. A hole J1 is formed in the center of the protrusion H1. Similarly, holes J2, J3, and J4 are formed in the centers of the protrusions H2, H3, and H4, respectively.
The polygon motor fixing portion 118 is a metal plate such as aluminum.
After the polygon motor fixing portion 118 is pressed, a plurality of convex portions are pressed against a portion other than the protrusions H1, H2, H3, and H4 (shaded portion D2 in FIG. 5D). A concave portion is formed (dimple processing).
On the protrusions H1 to H4, a circuit board 17 through which the protrusion F of a polygon motor 16 that rotates and drives the shaft 15 to which the polygon mirror 14 is fixed is placed. Then, the screw is screwed into the screw hole J1 through the hole C1, the screw hole J2 through the hole C2, the screw hole J3 through the hole C3, and the screw hole J4 through the hole C4. As a result, the circuit board 17 and the protrusions H1 to H4 formed on the polygon motor fixing part 118 are fixed. In other words, the circuit board 17 through which the projection F of the polygon motor 16 passes is supported by the projections H1 to H4 formed on the polygon motor fixing part 118.
With such a configuration, the contact area between the circuit board 17 and the polygon motor fixing part 118 can be reduced as compared with the case where the entire circuit board 17 and the polygon motor fixing part 118 are fixed in contact with each other. A plurality of recesses sufficient to eliminate the “warping” caused by pressing can be formed in the polygon motor fixing portion 118 by pressing the plurality of protrusions. Accordingly, since the polygon motor fixing portion 118 is flat, the polygon mirror 14 is not inclined with respect to the photosensitive drum 37 when assembled to the housing 22.
That is, it is possible to provide an image forming apparatus including a laser scanner unit with high accuracy of light deflection and little distortion of an image to be formed.

1 is a cross-sectional view of an image forming apparatus X1 according to an embodiment of the present invention. FIG. 4 is a schematic diagram for explaining an optical path M from a polygon mirror 14 to a photosensitive drum 37 of the image forming apparatus X1 according to the embodiment of the present invention. 1 is a perspective view of a laser scanner unit L1 of an image forming apparatus X1 according to an embodiment of the present invention. FIG. 4 is a cross-sectional view taken along the line PP ′ viewed from the direction P3 in FIG. 3. The schematic diagram of the polygon mirror 14 and a polygon motor fixing | fixed part. The schematic diagram for demonstrating the shape of the recessed part formed in the polygon motor fixing | fixed part 18. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... LD board | substrate 12 ... Collimator lens 13 ... Cylindrical lens 14 ... Polygon mirror 15 ... Shaft 16 ... Polygon motor 17 ... Circuit board 18, 118 ... Polygon motor fixing | fixed part 19 ... Scanning lens 20 ... Reflection mirror 22 ... Case 21 ... BD Detection sensor 37 ... photosensitive drum

Claims (9)

An optical deflection device comprising: an optical deflection scanning means for deflecting and scanning light; a rotational driving means for rotationally driving an axis fixed to the optical deflection scanning means; and a fixing portion which is a metal plate for fixing the rotational driving means. A method for manufacturing a scanning device, comprising:
A pressing process for pressing the fixed portion;
A dimple forming step of forming a plurality of concave portions by pressing the plurality of convex portions on the surface or both surfaces of the fixed portion that is subjected to the rotation driving means;
A method of manufacturing an optical deflection scanning apparatus, comprising:   2. The method of manufacturing an optical deflection scanning apparatus according to claim 1, wherein the dimple formation step forms a recess in addition to a portion in contact with the rotation driving means.   3. The method of manufacturing an optical deflection scanning apparatus according to claim 1, wherein the rotation driving means is supported by a protrusion formed on the fixed portion.   4. The dimple formation step is to form a plurality of recesses having a size of approximately 0.5 mm and a depth of approximately 0.3 mm on the surface or both surfaces of the fixed portion on which the rotation driving means is provided at intervals of approximately 1.5 mm. The manufacturing method of the optical deflection | deviation scanning apparatus in any one of.   5. The method of manufacturing an optical deflection scanning apparatus according to claim 4, wherein the concave portion is substantially circular and the size is a diameter.   5. The method of manufacturing an optical deflection scanning apparatus according to claim 4, wherein the concave portion is substantially elliptical and the size is a major axis or a minor axis.   5. The method of manufacturing an optical deflection scanning apparatus according to claim 4, wherein the concave portion is substantially rectangular, and the size is a diagonal length, a long side length, or a short side length. An optical deflection device comprising: an optical deflection scanning means for deflecting and scanning light; a rotational driving means for rotationally driving an axis fixed to the optical deflection scanning means; and a fixing portion which is a metal plate for fixing the rotational driving means. A scanning device,
The light deflection scanning apparatus according to claim 1, wherein the fixing portion is a plate-like member having a plurality of concave portions formed on a surface or both surfaces on which the rotation driving means is provided.   An image forming apparatus comprising the light deflection scanning device according to claim 8.

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