JPH09224344A - Bearing device of spindle motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reading and writing accuracy and characteristics of a pickup with a simple configuration drastically and at the same time reduce the cost of a product. SOLUTION: The thrust support of a spindle motor 22 is provided at a chassis 21 and a circular spindle motor mounting reference projecting part is formed coaxially with a spindle shaft 22A on a chassis 21 located outside the thrust support as the mounting standard of the spindle motor 22. Then, by pressing or fitting the inner periphery of the fixed edge of the side of a stator substrate 23 of a bearing housing 24 into the outer periphery of the spindle motor mounting reference protruding part, the center of the spindle motor 22 can be positioned in parallel with the traveling direction of a pick-up and to a reference line that crosses the center of the pick-up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CD player, C
More specifically, the present invention relates to a bearing device of a spindle motor used in a disk media device such as a D-ROM driver. More specifically, the thrust receiving portion of the spindle motor is provided on the chassis side, and the thrust receiving portion serves as a mounting reference of the spindle motor. Thus, the present invention relates to a spindle motor bearing device in which the accuracy of mounting the spindle motor on the chassis is improved.

[0002]

2. Description of the Related Art CD players, CD-ROM drivers,
A disk media device such as a CD-R driver, an MD driver, and an MO driver includes a spindle motor and a pickup that rotate the disk, and moves the pickup in the radial direction of the disk while rotating the disk with the spindle motor. The recorded information can be read and the information can be written to the disc.

A disk media device corresponding to a conventional CD-ROM driver will be described with reference to FIGS. 20 and 21, 1 is a rectangular chassis, 2 is a spindle motor arranged on the lower surface of the chassis 1, and 3 is a stator substrate.
The spindle motor 2 is supported by a cylindrical bearing housing 4 fixed vertically on the stator substrate 3. Further, the space members 5 are provided at both ends of the stator substrate 3.
It is fixed to the lower surface of the chassis 1 by a mounting screw 6 via. As shown in FIG. 22, a spindle shaft 2A of the spindle motor 2 is rotatably supported by a radial bearing 7 in a bearing housing 4, and further, the spindle shaft 2A
The lower end of A is supported by a thrust receiver 9 fixed to the lower end of the bearing housing 4 by a thrust receiving plate 8. The upper end of the spindle shaft 2A of the spindle motor 2 is projected upward through the chassis 1, and the turntable 10 is concentrically fixed to the projecting end, and the disc 11 is removably mounted on the turntable 10. There is.

In FIGS. 20 and 21, reference numeral 12 denotes a pickup body arranged on the lower surface side of the disk 11.
The pickup body 12 is supported by a guide rod 13 and a feed screw 14 which are arranged in the chassis 1 in a desired space and arranged parallel to the radial direction of the disk 11, and a thread motor 16 is connected to the feed screw 14 via a gear train 15. By driving the thread motor 16 and rotating the feed screw 14, the pickup body 12 can be moved in the radial direction of the disk 11. Also,
A pickup (optical lens system) 17 for reading information recorded on the disk 11 is attached to the pickup body 12. Reference numeral 18 denotes a cushioning member made of rubber or the like attached to the four corners of the lower surface of the chassis 1.

[0005]

In such a disk media device, the center of the disk 11, that is, the spindle motor 2 is generally located on a reference line L parallel to the moving direction of the pickup 17 and perpendicular to the center of the pickup 17. It is an essential condition that the center axis of rotation is located. If the center of the disk 11 with respect to the reference line L is displaced to the left or right, the reading and writing accuracy and characteristics of the pickup 17 with respect to the disk 11 are adversely affected. Will be affected. By the way, in the above-described conventional disk media device, when the center of the disk 11 is positioned on the reference line L of the pickup 17, the mounting portion of the stator substrate 3 to the chassis 1 (the space member 5 and the mounting screw 6). Is set as a reference, and the spindle motor 2 is attached to the chassis 1 based on this attachment portion.

However, in such a conventional spindle motor mounting method, the stator substrate 3 and the chassis 1 are
Since the center of the spindle motor 2 is aligned with the reference line L of the pickup 17 via the mounting member to the center, the machining tolerance and the assembly error of the stator substrate, the chassis 1 and the mounting member are caused by the position of the center of the spindle motor 2. There is a problem that it occurs as a shift and deteriorates the reading and writing accuracy and characteristics of the pickup. Further, in order to reduce these deteriorations, if the dimensional accuracy of the components such as the stator substrate, the chassis and the mounting member is strictly required beyond the limit, each component becomes expensive and the product cost increases.

The present invention has been made in view of the above-mentioned circumstances, and a spindle motor which can drastically improve the reading and writing accuracy and characteristics of a pickup with a simple structure and which enables cost reduction of a product. An object is to provide a bearing device.

[0008]

In order to solve the above-mentioned problems, the present invention provides a chassis, a stator substrate fixed on the chassis, a bearing housing vertically fixed to the stator substrate, and the bearing housing. A spindle motor for driving a disk supported by a spindle shaft that is rotatably supported by a radial bearing therein; a thrust receiver that is provided in the chassis and pivotally supports a lower end of the spindle shaft; and the thrust. A circular convex or concave spindle motor mounting reference portion formed concentrically with the spindle shaft is provided at a portion of the chassis that is outside the receiver and faces the fixed end of the bearing housing. Fit the inner or outer periphery of the fixed end of the bearing housing to the outer or inner periphery of the concave spindle motor mounting reference part. Characterized in that it is configured to position the center of the spindle motor by Rukoto.

The present invention is also directed to a chassis, a stator substrate fixed on the chassis, a bearing housing vertically fixed to the stator substrate, and a rotatable shaft in the bearing housing via a radial bearing. A spindle motor for driving a disk supported by a supported spindle shaft, a thrust receiver provided on the chassis for pivotally supporting a lower end of the spindle shaft, and the chassis facing the outside of a fixed end of the bearing housing. A circular convex or concave spindle motor mounting reference portion formed concentrically with the spindle shaft at the location of the spindle shaft, and by being fitted to the convex or concave spindle motor mounting reference portion formed on the stator substrate. Provide with a circular concave or convex reference part for positioning the center of the spindle motor. It is intended. The present invention also includes a chassis, a stator substrate fixed on the chassis,
A bearing housing fixed vertically to the stator substrate, a spindle motor for driving a disk supported by a spindle shaft rotatably supported in the bearing housing via a radial bearing, and a chassis provided on the chassis, A thrust receiver that pivotally supports the lower end of the spindle shaft, and a circular convex shape that is concentric with the spindle shaft at a location outside the thrust receiver that faces the fixed end of the bearing housing. Alternatively, the spindle motor mounting reference portion having a concave shape is provided, and the center of the spindle motor is positioned by fitting the inner circumference or the outer circumference of the radial bearing to the outer circumference or the inner circumference of the convex or concave spindle motor mounting reference portion. It is characterized in that it is configured to perform.

Therefore, in the present invention, by fitting the inner or outer circumference of the fixed end of the bearing housing to the outer or inner circumference of the convex or concave spindle motor mounting reference portion, this serves as the mounting reference for the spindle motor. Therefore, the center of the spindle motor can be reliably positioned with respect to the reference line that is parallel to the moving direction of the pickup and is orthogonal to the center of the pickup, and the reading and writing accuracy and characteristics of the pickup can be dramatically improved. The dimensional accuracy of parts such as chassis and chassis can be made rough, and the cost of the product can be reduced. Further, in the present invention, the concave or convex reference portion formed on the stator substrate is fitted into the convex or concave spindle motor attachment reference portion, and this serves as the attachment reference of the spindle motor, so that the movement of the pickup is reduced. The spindle motor center can be reliably positioned with respect to the reference line that is parallel to the direction and perpendicular to the pickup center, and the reading and writing accuracy and characteristics of the pickup can be dramatically improved. The dimensional accuracy can be made rough, and the cost of the product can be reduced. Further, in the present invention, by fitting the inner circumference or the outer circumference of the radial bearing to the outer circumference or the inner circumference of the convex or concave spindle motor mounting reference portion, this serves as the mounting reference of the spindle motor, so that the pickup movement The spindle motor center can be reliably positioned with respect to a reference line that is parallel to the direction and perpendicular to the pickup center, and the reading and writing accuracy and characteristics of the pickup can be dramatically improved. The dimensional accuracy can be made rough, and the cost of the product can be reduced.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) A first embodiment of the present invention will be described with reference to FIGS. 1 is a plan view of a disk media device to which a spindle motor bearing device according to the present invention is applied, and FIG. 2 is a side view seen from the direction of arrow A in FIG.
FIG. 3 is an enlarged cross-sectional view of the spindle motor bearing portion. 1 and 2, reference numeral 21 is a rectangular chassis, 22 is a spindle motor installed on the upper surface of the chassis 21, and this spinle motor 22 has a stator substrate 23 and a cylindrical bearing housing 24. Both ends of the stator substrate 23 are fixed to the upper surface of the chassis 21 by mounting screws 25, and the lower end of the bearing housing 24 is fixed to the stator substrate 23.
In the bearing housing 24, a spindle shaft 22A of a spindle motor 22 is rotatably supported by a radial bearing 26 as shown in FIG. The tip end is supported by a disk-shaped thrust receiver 27 such as Teflon inserted in a recess 21A formed concentrically with the spindle shaft 22A on the upper surface of the chassis 21. Further, on the upper surface of the chassis 21, a spindle motor attachment reference convex portion 28 protruding in a ring shape is formed concentrically with the spindle shaft 22A at a position facing the outer periphery of the insertion concave portion 21A of the thrust receiver 27. The lower end opening of the bearing housing 24 is press-fitted or fitted to the outer periphery of the spindle motor mounting reference convex portion 28. In this way, by simply fitting the lower end opening of the bearing housing 24 to the outer periphery of the spindle motor mounting reference convex portion 28, the center of the spindle shaft 22A is parallel to the moving direction of the pickup 36, which will be described later, and is orthogonal to the center of the pickup 36. It can be positioned on the reference line L. A turntable 29 is concentrically fixed to the upper end of the spindle shaft 22A of the spindle motor 22, and a disc 30 is detachably attached to the turntable 29.

In FIG. 1 and FIG. 2, 31 is the disk 3
The pickup main body 31 is arranged on the lower surface side of 0. The pickup main body 31 is supported by a guide rod 32 and a feed screw 33 which are arranged in the chassis 21 in a desired distance and arranged parallel to the radial direction of the disk 30, and the feed screw 33. Is connected to a thread motor 35 via a gear train 34,
By driving the thread motor 35 and rotating the feed screw 33, the pickup body 31 is moved to the disk 30.
It can move in the radial direction. A pickup (optical lens system) 36 for reading information recorded on the disc 30 is attached to the pickup body 31. Reference numeral 37 denotes a cushioning member made of rubber or the like attached to the four corners of the lower surface of the chassis 21.

In the first embodiment configured as described above, the lower end opening of the bearing housing 24 is fitted to the outer periphery of the spindle motor mounting reference convex portion 28, and the spindle is set with the inner diameter of the bearing housing 24 as a reference. Since the center of the shaft 22A is positioned on the reference line L of the pickup 36, the spindle motor 22 with respect to the reference line L
The positioning of the rotation center axis of the spindle is assured, and even if there are processing tolerances on the stator substrate and chassis as in the past, this does not affect the positioning of the rotation center axis of the spindle motor and the reading and writing of the pickup is performed. The accuracy and characteristics can be dramatically improved, and the dimensional accuracy of the components such as the stator substrate and chassis can be made rough, and as a result, the cost of the product can be reduced. Further, since the spindle motor is directly mounted on the chassis by the stator substrate, the conventional space member and thrust receiving plate are not required, and the number of parts can be reduced.

(Second Embodiment) FIG. 4 is an enlarged cross-sectional view of a spindle motor bearing portion showing a second embodiment of the present invention. The second embodiment is different from the first embodiment in that, as is apparent from FIG. 4, the radial bearing of the spindle shaft 22A is replaced with a roller or ball type radial bearing, and a bearing housing 24 is provided. The thrust receiver 39 formed by using the integrally formed metal type radial bearing 38 and a separate member is omitted, and instead, the thrust receiver 39 of the spindle shaft 22A is replaced by the chassis 21.
The structure is the same as that of FIG. 3 except for the above. In the second embodiment as described above, the same effects as those of the first embodiment can be obtained, and in addition to the thrust receiver and the radial bearing, which are formed as separate members, as compared with the first embodiment. This has the effect of reducing the number of parts.

(Third Embodiment) FIG. 5 is an enlarged cross-sectional view of a spindle motor bearing portion showing a third embodiment of the present invention. The third embodiment is different from the first embodiment in that, as is apparent from FIG. 5, a ring-shaped spindle motor mounting reference concave portion is provided at a position facing the lower end of the bearing housing 24 on the upper surface of the chassis 21. 40 is formed concentrically with the spindle shaft 22A, and the lower end outer circumference of the bearing housing 24 is press-fitted or fitted into the outer inner circumference of the spindle motor mounting reference concave portion 40, whereby the center of the spindle shaft 22A is picked up. 36
3 is the same as that of FIG. 3 except for the position where it can be positioned on the reference line L. In the third embodiment as described above, the same operational effects as those of the first embodiment can be obtained.

(Fourth Embodiment) FIG. 6 is an enlarged sectional view of a spindle motor bearing portion showing a second embodiment of the present invention. The fourth embodiment is different from the third embodiment in that, as is apparent from FIG. 6, the radial bearing of the spindle shaft 22A is replaced with a roller or ball type radial bearing, and a bearing housing 24 is provided. The thrust receiver 39 formed by using the integrally formed metal type radial bearing 38 and a separate member is omitted, and instead, the thrust receiver 39 of the spindle shaft 22A is replaced by the chassis 21.
The structure is the same as that of FIG. 5 except for that. In the fourth embodiment as described above, the same effects as those of the first embodiment can be obtained, and in addition to the third embodiment, the thrust bearing and the radial bearing which are composed of separate members are unnecessary. This has the effect of reducing the number of parts.

(Fifth Embodiment) FIG. 7 is an enlarged cross-sectional view of a spindle motor bearing portion showing a fifth embodiment of the present invention. The fifth embodiment is different from the first embodiment in that, as is apparent from FIG. 7, a ring-shaped spindle motor mounting reference convex portion is provided on the upper surface of the chassis 21 so as to face the bearing housing 24. 41 is formed concentrically with the spindle shaft 22A, and a circular reference hole 42 formed inside the stator substrate 23 to which the lower end of the bearing housing 24 is joined is press-fitted or fitted around the spindle motor mounting reference convex portion 41. The center of the spindle shaft 22A can be positioned on the reference line L of the pickup 36 by this, and other configurations are the same as those in FIG. In the fifth embodiment as described above, the same operational effects as those of the first embodiment can be obtained.

(Sixth Embodiment) FIG. 8 is an enlarged sectional view of a spindle motor bearing portion showing a sixth embodiment of the present invention. The sixth embodiment is different from the fifth embodiment in that, as is clear from FIG. 8, the radial bearing of the spindle shaft 22A is replaced with a roller or ball type radial bearing, and a bearing housing 24 is provided. The thrust receiver 39 formed by using the integrally formed metal type radial bearing 38 and a separate member is omitted, and instead, the thrust receiver 39 of the spindle shaft 22A is replaced by the chassis 21.
The structure is the same as that of FIG. 7 except for the above. In the sixth embodiment as described above, the same effects as those of the first embodiment can be obtained, and in addition to the fifth embodiment, the thrust bearing and the radial bearing, which are configured as separate members, are unnecessary. This has the effect of reducing the number of parts.

(Seventh Embodiment) FIG. 9 is an enlarged sectional view of a spindle motor bearing portion showing a seventh embodiment of the present invention. The seventh embodiment differs from the first embodiment in that a circular spindle motor mounting reference convex portion 43 having a diameter larger than that of the bearing housing 24 is formed on the upper surface of the chassis 21, as is clear from FIG. 9. A circular reference concave portion 44 formed concentrically with the spindle shaft 22A and engaging with the spindle motor mounting reference convex portion 43 is formed concentrically with the spindle shaft 22A on the stator substrate 23, and an inner diameter portion of the reference concave portion 44 is formed in the spindle motor. It fits on the outer periphery of the mounting reference convex portion 43 by press fitting or fitting so that the center of the spindle shaft 22A can be positioned on the reference line L of the pickup 36, and other configurations are shown in FIG. Is the same as In the seventh embodiment as described above, the same operational effects as those of the first embodiment can be obtained.

(Eighth Embodiment) FIG. 10 is an enlarged sectional view of a spindle motor bearing portion showing an eighth embodiment of the present invention. The eighth embodiment is different from the seventh embodiment in that, as is apparent from FIG.
In place of the roller or ball type radial bearings for the radial bearings of the spindle shaft 22A, a metal type radial bearing 38 integrally formed with the bearing housing 24 is used, and a thrust bearing composed of a separate member is omitted. Instead, the thrust receiver 39 of the spindle shaft 22A is integrally formed with the chassis 21, and the other structure is the same as that of FIG. In the eighth embodiment as described above, the same effects as those of the first embodiment can be obtained, and as compared with the seventh embodiment, the thrust bearing and the radial bearing formed of separate members are unnecessary. This has the effect of reducing the number of parts.

(Ninth Embodiment) FIG. 11 is an enlarged sectional view of a spindle motor bearing portion showing a ninth embodiment of the present invention. The ninth embodiment is different from the first embodiment in that, as is apparent from FIG.
A ring-shaped spindle motor mounting reference recess 45 is provided on the upper surface of the chassis 21 at a position facing the lower end of the bearing housing 24.
Is formed concentrically with the spindle shaft 22A, and a circular reference convex portion 46 is formed concentrically with the spindle shaft 22A at a penetrating portion of the stator substrate 23 to which the lower end portion of the bearing housing 24 is joined by penetrating. The outer diameter portion is fitted into the inner periphery of the spindle motor mounting reference concave portion 45 by press fitting or fitting so that the center of the spindle shaft 22A can be positioned on the reference line L of the pickup 36. The other configuration is the same as that of FIG. In the ninth embodiment as described above, the same effect as that of the first embodiment can be obtained.

(Tenth Embodiment) FIG. 12 is an enlarged sectional view of a spindle motor bearing portion showing a tenth embodiment of the present invention. In the tenth embodiment, the difference from the ninth embodiment is that, as is apparent from FIG. 12, the radial bearing of the spindle shaft 22A is replaced with a roller or ball type radial bearing, and a bearing housing 24 is provided. Where a integrally formed metal type radial bearing 38 is used and a thrust receiver composed of a separate member is omitted,
Instead, the thrust receiver 39 of the spindle shaft 22A is integrally formed with the chassis 21, and the other structure is the same as that of FIG. In the tenth embodiment as described above, the same effects as those of the first embodiment can be obtained, and as compared with the ninth embodiment, the thrust bearing and the radial bearing formed of separate members are unnecessary. This has the effect of reducing the number of parts.

(Eleventh Embodiment) FIG. 13 is an enlarged sectional view of a spindle motor bearing portion showing an eleventh embodiment of the present invention. The eleventh embodiment differs from the first embodiment in that, as is clear from FIG. 13, the outer diameter of the bearing housing 24 is larger than the outer diameter of the bearing housing 24 at a position facing the lower end of the bearing housing 24 on the upper surface of the chassis 21. A ring-shaped spindle motor mounting reference concave portion 47 is formed concentrically with the spindle shaft 22A, and a circular reference convex portion 48 which engages with the spindle motor mounting reference concave portion 47 is formed on the stator substrate 23 concentrically with the spindle shaft 22A. The outer diameter portion of the reference convex portion 48 is set to the spindle motor mounting reference concave portion 4
It fits into the inner circumference of 7 by press fitting or fitting.
The center of the spindle shaft 22A can be positioned on the reference line L of the pickup 36, and other configurations are the same as those in FIG. In the eleventh embodiment as described above, the same operational effects as those of the first embodiment can be obtained.

(Twelfth Embodiment) FIG. 14 is an enlarged sectional view of a spindle motor bearing portion showing a twelfth embodiment of the present invention. In the twelfth embodiment, the difference from the eleventh embodiment is that, as is apparent from FIG. 14, the radial bearing of the spindle shaft 22A is replaced with a roller or ball type radial bearing, and a bearing housing 24 is used.
A thrust bearing composed of a metal radial bearing 38 and a thrust bearing constituted by a separate member is omitted. Instead of this, a thrust bearing 39 of the spindle shaft 22A is used.
Is integrally formed with the chassis 21, and other configurations are the same as those in FIG. In the twelfth embodiment as described above, the same effects as those of the first embodiment can be obtained, and, unlike the eleventh embodiment, the thrust bearing and the radial bearing which are composed of separate members are unnecessary. This has the effect of reducing the number of parts.

(Thirteenth Embodiment) FIG. 15 is an enlarged sectional view of a spindle motor bearing portion showing a thirteenth embodiment of the present invention. The thirteenth embodiment differs from the first embodiment in that, as is apparent from FIG. 15, the upper surface of the chassis 21 is located at a position facing the outer periphery of the insertion recess 21A of the thrust receiver 27. A spindle motor mounting reference convex portion 49 protruding in a ring shape is formed concentrically with the spindle shaft 22A, and the inner periphery of the lower end portion of the radial bearing 26 of the spindle shaft 22A is press-fitted or fitted onto the outer periphery of the spindle motor mounting reference convex portion 49. The center of the spindle shaft 22A can be positioned on the reference line L of the pickup 36 by fitting, and other configurations are the same as those in FIG. In the thirteenth embodiment as described above, the same operational effects as those of the first embodiment can be obtained.

(Fourteenth Embodiment) FIG. 16 is an enlarged sectional view of a spindle motor bearing portion showing a fourteenth embodiment of the present invention. In the fourteenth embodiment, the difference from the thirteenth embodiment is that, as is clear from FIG. 14, the radial bearing of the spindle shaft 22A is replaced with a roller or ball type radial bearing, and the bearing housing 24
A thrust bearing composed of a metal radial bearing 38 and a thrust bearing constituted by a separate member is omitted. Instead of this, a thrust bearing 39 of the spindle shaft 22A is used.
Is integrally molded with the chassis 21, and the inner circumference of the lower end portion of the radial bearing 38 is set to the spindle motor mounting reference convex portion 49.
It is in the place where it is fitted by press fitting or fitting to the outer periphery of
The other configuration is the same as that of FIG. Such first
In the fourth embodiment, the same effect as the first embodiment can be obtained, and in comparison with the thirteenth embodiment,
There is an effect that the number of parts can be reduced by eliminating the need for a thrust bearing and a radial bearing composed of separate members.

(Fifteenth Embodiment) FIG. 17 is an enlarged sectional view of a spindle motor bearing portion showing a fifteenth embodiment of the present invention. In the fifteenth embodiment, the point different from the first embodiment is that, as is apparent from FIG. 17, the upper surface of the chassis 21 is located at a position facing the outer periphery of the insertion recess 21A of the thrust receiver 27. A spindle motor mounting reference convex portion 50 protruding in a ring shape is formed concentrically with the spindle shaft 22A, and a circular reference step portion 51 is formed concentrically with the spindle shaft 22A on the inner periphery of the lower end portion of the radial bearing 26 of the spindle shaft 22A. The inner diameter portion of the reference step portion 51 is fitted into the outer periphery of the spindle motor attachment reference convex portion 50 by press fitting or fitting, whereby the spindle shaft 2
The center of 2A is located on the reference line L of the pickup 36, and the other structures are the same as those in FIG. In the fifteenth embodiment as described above, the same operational effects as those of the first embodiment can be obtained.

(Sixteenth Embodiment) FIG. 18 is an enlarged sectional view of a spindle motor bearing portion showing a sixteenth embodiment of the present invention. In the 16th embodiment, the difference from the 15th embodiment is that, as is apparent from FIG. 18, the radial bearing of the spindle shaft 22A is replaced with a roller or ball type radial bearing, and the bearing housing 24
A thrust bearing composed of a metal radial bearing 38 and a thrust bearing constituted by a separate member is omitted. Instead of this, a thrust bearing 39 of the spindle shaft 22A is used.
Is integrally molded with the chassis 21, and a reference step 52 is formed on the inner circumference of the lower end of the radial bearing 38.
And the inner diameter portion of the reference step portion 52 is fitted into the outer periphery of the spindle motor attachment reference convex portion 50 by press fitting or fitting, and the other configuration is the same as that of FIG. In the sixteenth embodiment as described above, the same effects as those of the first embodiment can be obtained, and, unlike the sixteenth embodiment, the thrust bearing and the radial bearing which are composed of separate members are unnecessary. This has the effect of reducing the number of parts.

(Seventeenth Embodiment) FIG. 19 is an enlarged sectional view of a spindle motor bearing portion showing a seventeenth embodiment of the present invention. The 17th embodiment differs from the first embodiment in that, as is clear from FIG. 19, a ring-shaped spindle motor mounting reference concave portion is provided on the upper surface of the chassis 21 at a position facing the lower end of the bearing housing 24. 53 is formed concentrically with the spindle shaft 22A, and the spindle shaft 2 is attached to the inner periphery of the spindle motor mounting reference convex portion 50.
The outer periphery of the lower end portion of the radial bearing 26 of 2A is fitted by press fitting or fitting so that the center of the spindle shaft 22A can be positioned on the reference line L of the pickup 36. It is the same as FIG. In such a nineteenth embodiment, the same operational effects as those of the first embodiment can be obtained.

[0030]

As is apparent from the above description, according to the present invention, the inner or outer periphery of the fixed end of the bearing housing is fitted to the outer or inner periphery of the convex or concave spindle motor mounting reference portion. As a result, this serves as a mounting reference for the spindle motor, so that the spindle motor center is reliably positioned with respect to a reference line that is parallel to the moving direction of the pickup and is orthogonal to the center of the pickup. Not only can it be dramatically improved, but the dimensional accuracy of parts such as the stator board and chassis can be made rough, and the cost of the product can be reduced. Further, in the present invention, by fitting the reference portion formed on the stator substrate to the convex or concave spindle motor attachment reference portion, which serves as the attachment reference of the spindle motor, it is parallel to the moving direction of the pickup. Moreover, the positioning of the spindle motor center relative to the reference line perpendicular to the pickup center can be ensured, and the reading and writing accuracy and characteristics of the pickup can be dramatically improved, and the dimensional accuracy of parts such as the stator board and chassis can be roughened. And the cost of the product can be reduced. Further, in the present invention, by fitting the inner circumference or the outer circumference of the radial bearing to the outer circumference or the inner circumference of the convex or concave spindle motor mounting reference portion, this serves as the mounting reference of the spindle motor, so that the pickup movement The spindle motor center can be reliably positioned with respect to a reference line that is parallel to the direction and perpendicular to the pickup center, and the reading and writing accuracy and characteristics of the pickup can be dramatically improved. The dimensional accuracy can be made rough, and the cost of the product can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view of a disk media device to which a spindle motor bearing device according to the present invention is applied.

FIG. 2 is a side view as seen from the direction of arrow A in FIG.

FIG. 3 is an enlarged cross-sectional view of a spindle motor bearing portion according to the first embodiment of the present invention.

FIG. 4 is an enlarged sectional view of a spindle motor bearing portion according to a second embodiment of the present invention.

FIG. 5 is an enlarged sectional view of a spindle motor bearing portion according to a third embodiment of the present invention.

FIG. 6 is an enlarged sectional view of a spindle motor bearing portion according to a fourth embodiment of the present invention.

FIG. 7 is an enlarged sectional view of a spindle motor bearing portion according to a fifth embodiment of the present invention.

FIG. 8 is an enlarged sectional view of a spindle motor bearing portion according to a sixth embodiment of the present invention.

FIG. 9 is an enlarged sectional view of a spindle motor bearing portion according to a seventh embodiment of the present invention.

FIG. 10 is an enlarged sectional view of a spindle motor bearing portion according to an eighth embodiment of the present invention.

FIG. 11 is an enlarged sectional view of a spindle motor bearing portion according to a ninth embodiment of the present invention.

FIG. 12 is an enlarged sectional view of a spindle motor bearing portion according to a tenth embodiment of the present invention.

FIG. 13 is an enlarged sectional view of a spindle motor bearing portion according to an eleventh embodiment of the present invention.

FIG. 14 is an enlarged sectional view of a spindle motor bearing portion according to a twelfth embodiment of the present invention.

FIG. 15 is an enlarged sectional view of a spindle motor bearing portion according to a thirteenth embodiment of the present invention.

FIG. 16 is an enlarged sectional view of a spindle motor bearing portion according to a fourteenth embodiment of the present invention.

FIG. 17 is an enlarged sectional view of a spindle motor bearing portion according to a fifteenth embodiment of the present invention.

FIG. 18 is an enlarged sectional view of a spindle motor bearing portion according to a sixteenth embodiment of the present invention.

FIG. 19 is an enlarged sectional view of a spindle motor bearing portion according to a seventeenth embodiment of the present invention.

FIG. 20 is a plan view of a disk media device to which a conventional spindle motor bearing device is applied.

21 is a side view as seen from the direction of arrow B in FIG.

FIG. 22 is an enlarged sectional view of a conventional spindle motor bearing portion.

[Explanation of symbols]

21 ... Chassis, 22 ... Spindle motor, 22A
...... Spindle shaft, 23 ...... Stator substrate, 24 ...... Bearing housing, 26, 38 ...... Radial bearings, 27,3
9 ... Thrust receiver, 28 ... Spindle motor mounting reference convex portion, 29 ... Turntable, 30 ... Disc, 3
6 ... Pickup, 40 ... Spindle motor mounting reference concave portion, 41 ... Spindle motor mounting reference convex portion, 42
...... Reference hole, 43 ...... Spindle motor mounting reference convex part,
44 ... Reference concave portion, 45 ... Spindle motor mounting reference concave portion, 46 ... Reference convex portion, 47 ... Spindle motor mounting reference concave portion, 48 ... Reference convex portion, 49 ... Spindle motor mounting reference convex portion, 50 ... ... Spindle motor mounting reference convex portion, 51 ... Reference step portion, 52 ... Reference step portion, 53 ...
Spindle motor mounting reference recess

Claims (3)

[Claims] 1. A chassis, a stator substrate fixed on the chassis, a bearing housing vertically fixed to the stator substrate, and a spindle rotatably supported in the bearing housing via a radial bearing. A spindle motor for driving a disk supported by a shaft; a thrust receiver provided on the chassis for pivotally supporting a lower end of the spindle shaft; and an outer side of the thrust receiver opposite to a fixed end of the bearing housing. A circular convex or concave spindle motor mounting reference portion formed concentrically with the spindle shaft is provided at a location of the chassis, and the bearing housing is provided on an outer circumference or an inner circumference of the convex or concave spindle motor mounting reference portion. Of the center of the spindle motor by fitting the inner circumference or the outer circumference on the fixed end side of A bearing device for a spindle motor, which is configured to perform positioning. 2. A chassis, a stator substrate fixed on the chassis, a bearing housing vertically fixed on the stator substrate, and a spindle rotatably supported in the bearing housing via a radial bearing. A spindle motor for driving a disk supported by a shaft, a thrust receiver provided on the chassis for pivotally supporting a lower end of the spindle shaft, and the chassis at a location facing the outside of a fixed end of the bearing housing. A circular convex or concave spindle motor attachment reference portion formed concentrically with the spindle shaft and a spindle motor attachment reference portion formed on the stator substrate and fitted to the convex or concave spindle motor attachment reference portion. A circular concave or convex reference portion for positioning the center, and a spin Bearing device of Dorumota. 3. A chassis, a stator substrate fixed on the chassis, a bearing housing vertically fixed to the stator substrate, and a spindle rotatably supported in the bearing housing via a radial bearing. A spindle motor for driving a disk supported by a shaft; a thrust receiver provided on the chassis for pivotally supporting a lower end of the spindle shaft; and an outer side of the thrust receiver opposite to a fixed end of the bearing housing. A circular convex or concave spindle motor mounting reference portion formed concentrically with the spindle shaft is provided at a location of the chassis, and the radial bearing is provided on an outer circumference or an inner circumference of the convex or concave spindle motor mounting reference portion. The center of the spindle motor can be positioned by fitting the inner or outer circumference of A bearing device for a spindle motor, which is configured as described above.