JP2002230810A - Optical head device, and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical head device which is adaptive without increasing the cost to the case where the axel-to-axle distance of a pair of guiding shafts arranged in approximately parallel with each other is different, and to provide a method for manufacturing the optical head device. SOLUTION: The upper arm part 301 and lower arm part 302 of a second bearing 300 which engages with the guiding shaft are both formed in a sufficiently long dimension in the frame 3 of the optical head device 1. Thus, the guiding shaft 2B is engaged with the bottom part of the upper arm part 301 and of the lower arm part 302 when the guiding shaft 2B is located at a position which is closer to the main body 30 of the frame, on the other hand, the guiding shaft 2B is engaged with the front end part of the upper arm part 301 and of the lower arm part 302 when the guiding shaft 2B is located at a position which is remote from the main body 30 of the frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an optical head device used for recording and reproducing an optical recording medium such as a CD (compact disk) and a DVD (digital versatile disk). More specifically, the present invention relates to a structure of a frame on which optical components are mounted in an optical head device.

[0002]

2. Description of the Related Art In an optical head device used for recording and reproducing data on and from an optical recording medium such as a CD or a DVD, light emitted from a light source is guided to an objective lens via a light guide system, and the light converged by the objective lens. Is converged on the optical recording medium. At this time, the objective lens is driven in the tracking direction and the focusing direction by a lens driving device.
The return light from the optical recording medium is also guided to a light receiving element via a light guide system. here,
Various optical components constituting the light guide system are mounted at predetermined positions on a frame together with a light source, a lens driving device, a light receiving element, and the like.

[0003] The optical head device configured as described above needs to be scanned in the radial direction of the optical recording medium. For this reason, a pair of guide shafts extending in the radial direction of the optical recording medium are arranged in the optical head device, while both ends of the frame main body on which the light source, the lens driving device, and the light receiving element are mounted in the frame. The first and second bearings are formed integrally with the frame main body at a distance corresponding to the distance between the pair of guide shafts.

[0004]

In a disk drive for reproducing and recording an optical recording medium such as a CD or a DVD, the distance between a pair of guide shafts arranged substantially in parallel differs depending on the model and the manufacturer. You may have.

However, in such a situation,
The conventional optical head device in which the first and second bearings are formed integrally with the frame main body at a predetermined distance cannot be used. For this reason, conventionally, a plurality of types of frames in which the first and second bearings are formed at distant positions by a dimension corresponding to each separation distance of the guide shaft are designed and manufactured, and the plurality of types of frames are conventionally designed. From among the above, a frame having a structure suitable for the separation distance of the guide shaft is selected and used.
For this reason, conventionally, there is a problem in that the production cost increases in manufacturing the frame, and the cost of the optical head device cannot be reduced.

[0006] In view of the above problems, an object of the present invention is to provide:
An object of the present invention is to provide an optical head device capable of coping with a case where a pair of guide shafts arranged substantially in parallel have different separation distances without increasing cost, and a method of manufacturing the same.

[0007]

In order to solve the above-mentioned problems, the present invention provides a light source, a lens driving device for driving an objective lens for converging light emitted from the light source to an optical recording medium, and an optical recording medium. A light receiving element for receiving the return light, and a light source, the lens driving device, and a pair of guide shafts disposed substantially parallel to both ends of a frame main body on which the light receiving element is mounted. An optical head device having a frame provided with the first and second bearings is configured as follows.

First, in the first embodiment of the present invention, the first
And one of the second bearing and the second bearing is detachable from the frame body.

In the method for manufacturing an optical head device having such a configuration, a plurality of types of bearings having different lengths are prepared as the one bearing, and among the plurality of types of bearings,
A bearing corresponding to a separation distance between the pair of guide shafts is selected and attached to the frame main body.

According to the present invention, even if the distance between the pair of guide shafts differs depending on the type of the disk drive device, etc.
The bearing at the distance may be attached to the frame body as one of the bearings. Therefore, if a plurality of types of one bearing are prepared, only one type of the frame body in which the other bearing is integrally formed need be prepared, so that a remarkable increase in production cost can be prevented. it can.

[0011] In a second aspect of the present invention, one of the first bearing and the second bearing is formed so that a mounting position with respect to the frame main body can be changed, so that the frame can be mounted on the frame. It is characterized in that it can be engaged with a guide shaft passing through a position at different distances from the main body.

According to the present invention, even if the distance between the pair of guide shafts differs depending on the type of the disk drive device, etc.
What is necessary is just to change the mounting position of one of the bearings so as to match this separation distance. Therefore, it is only necessary to prepare one type of frame body in which the other bearing is integrally formed and one type of one bearing, so that an increase in production cost can be prevented.

In a third aspect of the present invention, one of the first bearing and the second bearing has an upper arm and a lower arm that sandwich the guide shaft from above and below. ,
One of the upper arm and the lower arm is integral with the frame main body with a dimension capable of abutting on a guide shaft passing through a position separated by a different distance from the frame main body. And the other arm is formed so as to be detachable from the frame main body or the one arm.

In such a method of manufacturing an optical head device,
As the other arm, a plurality of types of arms having different length dimensions are prepared, and an arm corresponding to a separation distance between the pair of guide shafts is selected from the plurality of types of arms. It is characterized in that it is attached to the frame body or the one arm.

According to the present invention, even if the distance between the pair of guide shafts differs depending on the type of the disk drive device, etc.
What is necessary is just to select an arm part which is at this distance and attach it to the frame body or one arm part as the other arm part. Therefore, if you prepare multiple types of the other arm,
One type of frame body in which the other bearing and one arm are integrally formed may be prepared, so that a significant increase in production cost can be prevented.

In a fourth aspect of the present invention, one of the first bearing and the second bearing has an upper arm and a lower arm for holding the guide shaft from above and below. ,
One of the upper arm portion and the lower arm portion is integrated with the frame main body with a dimension capable of contacting a guide shaft passing through a position separated by a different distance from the frame main body. The other arm portion is formed so as to be capable of changing a mounting position with respect to the frame body or the one arm portion, so that the guide shaft passes through a position separated by a different distance from the frame body. It is characterized in that it can be brought into contact with it.

According to the present invention, even if the distance between the pair of guide shafts differs depending on the type of the disk drive device, etc.
What is necessary is just to adjust the mounting position of the other arm part so as to match this separation distance. Therefore, one type of frame body including one arm and the other bearing, and one type of the other arm,
Since it is only necessary to prepare, it is possible to prevent an increase in production cost.

In the third or fourth aspect of the present invention, the upper arm of the upper arm and the lower arm may be formed integrally with the frame body as the one arm. preferable. That is, in the disk drive device, when the upper arm of the optical head and the guide shaft are urged so as to be in close contact with each other, if the upper arm is formed integrally with the frame main body, the upper arm is formed. , The position of the frame body can be defined with high accuracy.

In a fifth aspect of the present invention, one of the first bearing and the second bearing is engaged with a guide shaft passing through a position at a different distance from the frame body. It is characterized in that it is configured to be compatible.

According to the present invention, the distance between the pair of guide shafts is different depending on the type of the disk drive device and the like. One bearing is always engageable with the guide shaft. Therefore, only one kind of frame needs to be prepared, so that an increase in production cost can be prevented.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical head device to which the present invention is applied will be described with reference to the drawings. Before describing each embodiment of the present invention, a basic configuration common to the optical head devices of each embodiment will be described.

[Basic Configuration of Optical Head Device] FIG.
It is a top view of the principal part of the optical head device which performs recording / reproducing of D, CD-R, and DVD. 2 (A), (B),
FIG. 2C is a plan view, a left side view, and a right side view of a frame used in the optical head device shown in FIG. 1, respectively.

As shown in FIGS. 1 and 2, the optical head device 1 has a resin frame 3. The frame 3 has two guide shafts 2A and 2B attached so as to be parallel to each other with respect to the device.
2, and can be moved along the guide shafts 2A and 2B by being passed through the second bearing 300. In the frame 3, first bearings 391 and 392 and a second bearing 300 are formed at both ends of a frame main body 30 on which an optical system described below is mounted.

The optical system of the optical head device 1 includes a laser diode 4 for DVD that emits a first laser beam L1 and a laser diode 5 for CD that emits a second laser beam L2. Guiding the first and second laser beams L1 and L2 emitted from the diodes 4 and 5 to a common optical path 6, and using this common optical path 6 to perform all recording / reproduction of a CD, a CD-R, and a DVD Is available.

The common optical path 6 includes a light receiving element 11, a sensor lens 10, a light guide system 20, a collimating lens 7, a rising mirror 8 mounted on the frame 3, and an objective arranged above the rising mirror 8. It is defined by the lens 9.

The DVD laser diode 4 is for recording and reproducing DVDs, and emits a first laser beam L1 having a wavelength of 650 nm or 635 nm. On the other hand, the CD laser diode 5 is for recording and reproducing CDs and CD-Rs, and emits a second laser beam L2 having a wavelength of 780 to 800 nm. The laser diodes 4 and 5 are arranged on the same side of the light guide system 20 of the common optical path 6 so that their optical axes L10 and L20
Are arranged in parallel. In the example shown here, the DVD laser diode 4 is arranged closer to the light receiving element 11 than the CD laser diode 5.

The first laser light L 1 emitted from the DVD laser diode 4 directly enters the light guide system 20.
On the other hand, the second laser light L2 emitted from the CD laser diode 5 enters the light guide system 20 via the diffraction grating 12. The diffraction grating 12 is given predetermined diffraction characteristics, and divides the second laser light L2 emitted from the CD laser diode 5 into three beams.

Here, the circuit board 410 on which the laser diode 4 for DVD is mounted is mounted on the side surface 317 of the frame 3.
By being fixed by adhesive to
The laser diode 4 for DVD is disposed at the entrance of a hole 305 formed in the frame 3.
Through the first laser beam L1 to the light guide system 20.
The heat sink 40 to which the laser diode 5 for CD is fixed is adhered and fixed to the side surface 316 of the frame 3. Thereby, the laser diode 5 for CD is
The second laser light L <b> 2 is emitted to the light guide system 20 through the diffraction grating 12 through the hole 306.

The light guide system 20 comprises a half mirror 21 having a partially reflecting surface and a prism 22 having a partially reflecting surface. The half mirror 21 has a partially reflected surface of the first laser beam L emitted from the laser diode 4.
They are arranged so as to be inclined 45 degrees with respect to one optical axis L10. The prism 22 has a second laser beam L2 whose partial reflection surface is emitted from the laser diode 5.
Are arranged so as to be inclined 45 degrees with respect to the optical axis L20.

The optical head device 1 of the present embodiment configured as described above.
In the first, the first DVD
Of the laser light L1 is reflected by the partially reflecting surface of the half mirror 21, and the reflected light is incident on the partially reflecting surface of the prism 22 with its optical axis bent by 90 degrees. Then, the laser light L incident on the partial reflection surface
Most of the light 1 is transmitted directly to the rising mirror 8. On the other hand, the second laser light L2 for CD incident on the prism 22 is reflected by the partially reflecting surface of the prism 22 so that almost half of the light component is reflected, the optical axis thereof is bent by 90 degrees, and is incident on the rising mirror 8. . As described above, the first and second laser beams L1 and L2 are both guided to the common optical path 6 by the light guide system 20 including the half mirror 21 and the prism 22.

The laser light L1 for DVD and the laser light L2 for CD guided to the common optical path 6 by the light guide system 20.
Is reflected at right angles by the rising mirror 8 and then converted by the collimating lens 7 into a parallel light beam. The laser beams L1 and L2 converted into parallel light beams are guided to an objective lens 9, and the laser beam L1 for DVD is condensed as a light spot on a recording surface of a DVD as an optical recording medium via the objective lens 9. . The laser light L2 for CD is focused as a light spot on the recording surface of a CD or CD-R as an optical recording medium.

The laser beams L1, L2 reflected by the optical recording medium
Return light returns through the objective lens 9, the collimating lens 7, and the rising mirror 8, and returns to the light guide system 20 again. Of these return lights, most of the return light of the DVD laser light L1 passes through the partial reflection surface of the prism 22 as it is and returns to the half mirror 21. And half mirror 2
One half of the light passes through one partial reflection surface and enters the sensor lens 10. On the other hand, the return light of the laser light L2 for CD passes through the partially reflecting surface of the prism 22, and half of the light returns to the half mirror 21. Then, the light passes through the partially reflecting surface of the half mirror 21 as it is, and
Incident on. After that, each return light is focused on the common light receiving element 11 through the sensor lens 10. Sensor lens 1
Reference numeral 0 denotes a lens for generating astigmatism with respect to the return light of both laser beams L1 and L2.

In this embodiment, the sensor lens 10 is
It is arranged at the exit of a hole 307 formed in the frame 3 and detects light transmitted through the half mirror 21 through this hole 307. Further, behind the sensor lens 10, a circuit board 110 on which the light receiving element 11 is mounted is provided.
Is fixed to the side surface 311 of the frame 3 by adhesive, whereby the light receiving element 11 is mounted on the frame 3.

In the optical head device 1 configured as described above, the objective lens driving device 70 for driving the objective lens 9 in the focusing direction and the tracking direction has a lens holder 71 holding the objective lens 9. The lens holder 71 includes a cylindrical body 72 and a body 7.
2 is provided with a cylindrical bearing portion 73 formed inside. A pair of tracking drive coils 81 and a pair of focusing drive coils 82 are formed on the outer peripheral surface of the body 72.

A support shaft 91 stands upright from the bottom wall of the holder support member 35 held by the frame 3, and the support shaft 91 is inserted into the bearing 73 of the lens holder 71. An outer wall 356 and an inner wall 357 are formed on the holder support member 35, and a pair of tracking drive magnets 83 that constitute a tracking magnetic circuit are attached to the outer wall 356 so as to face the tracking drive coil 81. Therefore, the lens holder 71 can be rotated around the support shaft 91 to perform tracking error correction.

Further, a pair of focusing drive magnets 84 constituting a focusing magnetic circuit are attached to the outer wall 356 so as to face the focusing drive coil 82. Therefore, the lens holder 71 is connected to the support shaft 91
To correct the focusing error.

The lens holder 71 is connected to a flexible substrate 77 whose intermediate position is supported by the cut-and-raised portion 359 of the holder support member 35.

When the optical head device 1 configured as described above is scanned in the radial direction of the optical recording medium, the optical head device 1
A pair of guide shafts 2A, 2A extending in the radial direction of the optical recording medium;
Guided to B. Here, the guide shaft 2A is a main shaft,
Two first bearings 391, 3 are provided for the guide shaft 2A.
92 are engaged. On the other hand, the guide shaft 2B is a countershaft, and as shown in FIGS. 2B and 2C, the second bearing 300 includes an upper arm portion 301 for holding the guide shaft 2B from above and below and a lower side. And an arm 302. Therefore, in the frame 3, the first bearings 391 and 392 and the second bearing 300 are formed so as to be separated from both ends of the frame main body 30 by a distance corresponding to a separation distance between the guide shafts 2A and 2B. ing.

However, in a disk drive for reproducing and recording on an optical recording medium such as a CD or a DVD, the distance between the guide shafts 2A and 2B differs depending on the model and the manufacturer. For example, as shown by a dashed line LA in FIG.
When the guide shaft 2B passes through a position close to the frame main body 30, and as shown by a two-dot chain line LB in FIG.
When viewed from above, the guide shaft 2B is further separated by 3 mm,
It may be arranged at a position far from the frame body 30. Therefore, in the present invention, by configuring the second bearing 300 as described below, the guide shafts 2A, 2B
Corresponding to different distances.

[Embodiment 1] FIG. 3 shows a second embodiment of the frame 3 used in the optical head device 1 according to Embodiment 1 of the present invention.
It is explanatory drawing of the bearing 300 of FIG.

In the optical head device 1 of the present embodiment, the first bearings 391 and 392 described with reference to FIGS.
While being formed integrally with the frame body 30, the second bearing 300 is formed separately from the frame body 30, as shown in FIG.

The second bearing 300 is formed detachably with respect to the frame main body 30. That is, in the second bearing 300, the two through holes 3 are formed in the base portion 360, which serves as a connection portion with the frame main body 30, at positions overlapping with the two screw holes 371 and 372 of the frame main body 30.
61 and 362 are formed, and these through holes 361 and 36 are formed.
2, through two screw holes 371 of the frame body 30,
The second bearing 300 can be attached to the frame body 30 by screwing on each of the 372.

Here, an end 367 of the second bearing 300 abuts on the frame main body 30 to form a positioning wall 377 for defining a mounting position of the second bearing 300 on the frame main body 30.

The base 360 of the second bearing 300 has two through holes 361 and 362 for passing screws, and a small projection 373 for positioning protruding from the frame body 30 side. 368 and the frame body 30
The inspection hole 369 is formed so as to overlap the through hole 374 formed in the second bearing 300. The inspection hole 369 is used for inspecting the size and the like of the second bearing 300.

Here, as the second bearing 300, two types of bearings 300A and 300B having different dimensions of the upper arm portion 301 and the lower arm portion 302 are prepared, and the base portions of these two types of bearings 300A and 300B are prepared. The configuration of 360 is common.

Accordingly, when the guide shaft 2B passes through a position close to the frame main body 30 (see the dashed line LA in FIG. 1), the upper arm 301 and the lower arm 302
The bearing 300 </ b> A having a short dimension is attached to the frame main body 30 as the second bearing 300. On the other hand, when the guide shaft 2B passes through a position far from the frame body 30 (see the two-dot chain line LB in FIG. 1), the upper arm 30
The bearing 300 </ b> B having the long dimension of the first and lower arms 302 is attached to the frame main body 30 as the second bearing 300.
Therefore, according to the present embodiment, even if the separation distance between the pair of guide shafts 2A and 2B is different, the bearing 30 which is at this separation distance is used.
0A, 300B, and is attached to the frame main body 30 as the second bearing 300, the guide shafts 2A, 2B
Can be handled when the separation distances are different. Therefore, if two types of the second bearings 300 are prepared, the first bearings 39 are provided.
Since only one kind of the frame main body 30 in which the first and the second 392 are integrally formed need only be prepared,
In order to cope with the case where the separation distances A and 2B are different, the production cost of the optical pickup device 1 does not increase significantly.

The present embodiment is applied to both the frame body 30 and the second bearing 300 irrespective of the material.

[Embodiment 2] FIGS. 4A and 4B
(C) is an optical head device 1 according to Embodiment 2 of the present invention.
FIG. 2 is an explanatory view of a second bearing 300 of the frame 3 used for the first embodiment. FIG. 2 is an explanatory view showing a state corresponding to a case where the guide shaft 2B passes a position close to the frame main body 30 by the second bearing 300. FIG. 9 is an explanatory diagram showing a state corresponding to a case where the vehicle passes a position far from the frame body 30.

In the optical head device 1 of the present embodiment, the first bearings 391 and 392 described with reference to FIGS.
While being formed integrally with the frame main body 30, the second bearing 300 is formed separately from the frame main body 30, as shown in FIG.

The mounting position of the second bearing 300 in the frame main body 30 can be changed. That is, in the second bearing 300, the base portion 360 serving as a connection portion with the frame main body 30 has two through holes 361 and 362 through which screws pass through the two screw holes 371 and 372 of the frame main body 30. In addition to being formed at a position close to the base of the upper arm 301 and the lower arm 302, and at a position far from the base of the upper arm 301 and the lower arm 302, two through holes 361 and 362 are arranged. Through holes 363 and 364 are formed.

For this reason, in the manufacturing process of the optical head device 1, when the second bearing 300 is attached to the frame main body 30, the guide shaft 2 is positioned close to the frame main body 30.
4B (see the dashed line LA in FIG. 1), as shown in FIG.
Through holes 361, 36 for one screw hole 371, 372
The base 360 of the second bearing 300 is overlapped with the frame main body 30 so that the two overlap, and the second bearing 300 is screwed and fixed to the frame main body 30. On the other hand, the position far from the frame body 30 is the guide shaft 2B.
(See the two-dot chain line LB in FIG. 1)
As shown in FIG. 4C, the second bearing 30 is fixed to the frame main body 30 so that the through holes 363 and 364 overlap the two screw holes 371 and 372 of the frame main body 30.
The second bearing 300 is screwed and fixed to the frame main body 30 with the 0 base portion 360 overlapped.

As described above, according to the present embodiment, even if the distance between the pair of guide shafts 2A and 2B is different, the second bearing 3 with respect to the frame main body 30 is adjusted to match the distance.
00 can be changed, so that the first bearing 39
It is only necessary to prepare one type of the frame body 30 and the second bearing 300 in which the first and the second 392 are integrally formed. Therefore, in order to cope with the case where the separation distance between the guide shafts 2A and 2B is different, The production cost of the pickup device 1 does not increase significantly.

[Embodiment 3] FIG. 5 shows a second embodiment of a frame 3 used in an optical head device 1 according to Embodiment 3 of the present invention.
It is explanatory drawing of the bearing 300 of FIG.

In the optical head device 1 according to the present embodiment, the first bearings 391 and 392 described with reference to FIGS.
It is formed integrally with the frame body 30. Also, the second
In the bearing 300 of FIG. 5, as shown in FIG. 5, of the upper arm 301 and the lower arm 302, the upper arm 301 is formed integrally with the frame body 30, while the lower arm 302 is It is formed separately from the frame body 30.

Here, two types of arm portions 302A and 302B having different lengths are prepared as the lower arm portion 302. In these two types of arm portions 302A and 302B,
The configuration of the base portion 360 serving as a connection portion with the upper arm portion 301 or the frame main body 30 is common.

Therefore, when the guide shaft 2B passes through a position close to the frame main body 30 (see the dashed line LA in FIG. 1), the short arm portion 302A is connected to the lower arm portion 3A.
02 is attached to the frame main body 30 or the upper arm 301 using screws or the like. On the other hand, when the guide shaft 2B passes through a position far from the frame main body 30 (see the two-dot chain line LB in FIG. 1), the longer arm 302B is used as the lower arm 302 as the frame main body. 30 or the upper arm 301 using screws or the like. Therefore, according to the present embodiment, even if the distance between the pair of guide shafts 2A and 2B is different, the arm portion 302 which is at this distance is used.
A, 302B as the lower arm 302
Or, just by attaching to the upper arm 301, the guide shaft 2
It is possible to cope with the case where the separation distance between A and 2B is different. Therefore, if two types of the lower arm portions 302 are prepared, only one type of the frame body 30 in which the first bearings 391 and 392 and the upper arm portion 301 are integrally formed may be prepared. Therefore, in order to cope with the case where the separation distance between the guide shafts 2A and 2B is different, the optical pickup device 1
Production cost does not increase significantly.

In this embodiment, of the upper arm 301 and the lower arm 302, the upper arm 301 is formed integrally with the frame body 30, so that the position of the frame body 30 with respect to the guide shaft 2B is raised. It can be specified by accuracy. That is, in the disk drive device, as shown by an arrow X, an urging force is applied so that the upper arm 301 and the guide shaft 2B come into close contact with each other, so that the upper arm 301 is integrally formed with the frame main body 30. If this is done, this upper arm 301
Frame body 30 with respect to guide shaft 2B
Can be specified with high accuracy.

[Fourth Embodiment] FIG. 6 shows a second embodiment of the frame 3 used in the optical head device 1 according to the fourth embodiment of the present invention.
It is explanatory drawing of the bearing 300 of FIG.

In the optical head device 1 of the present embodiment, the first bearings 391 and 392 described with reference to FIGS.
It is formed integrally with the frame body 30. Also, the second
In the bearing 300 of FIG. 5, as shown in FIG. 5, of the upper arm 301 and the lower arm 302, the upper arm 301 is formed integrally with the frame body 30, while the lower arm 302 is It is formed separately from the frame body 30.

The position of the lower arm 302 with respect to the frame body 30 or the upper arm 301 can be changed. For this reason, in the manufacturing process of the optical head device 1, the second bearing 300 is
0, when the guide shaft 2B passes through a position close to the frame body 30 (see the dashed line L in FIG. 1).
A), the lower arm 302 is retracted to the position shown by the solid line in FIG. On the other hand, when the guide shaft 2B passes through a position far from the frame body 30 (see the dashed line LA in FIG. 1), the lower arm 302 is moved to the position indicated by the dashed line in FIG. Pull out.

As described above, according to the present embodiment, even if the distance between the pair of guide shafts 2A and 2B is different, the frame main body 30 or the upper arm portion 301 is adjusted to match the distance.
It is sufficient to change the attachment position of the lower arm 302 with respect to. Therefore, the first bearing 391, 392 and the second bearing 3
And the lower arm 302 of the second bearing 300 each having one type,
Since it is only necessary to prepare, the production cost of the optical pickup device 1 does not increase significantly in order to cope with the case where the separation distance between the guide shafts 2A and 2B is different.

In this embodiment, as in the third embodiment,
Since the upper arm 301 of the upper arm 301 and the lower arm 302 is formed integrally with the frame main body 30, the position of the frame main body 30 with respect to the guide shaft 2B can be defined with high accuracy. That is, in the disk drive device, as shown by an arrow X, an urging force is applied so that the upper arm 301 and the guide shaft 2B come into close contact with each other, so that the upper arm 301 is integrally formed with the frame main body 30. With this, the position of the frame main body 30 with respect to the guide shaft 2B can be defined with high accuracy based on the upper arm 301.

[Fifth Embodiment] FIG. 7 shows a second embodiment of the frame 3 used in the optical head device 1 according to the fifth embodiment of the present invention.
It is explanatory drawing of the bearing 300 of FIG.

In the optical head device 1 of this embodiment, all of the first bearings 391 and 392 and the second bearing 300 described with reference to FIGS. 1 and 2 are formed integrally with the frame main body 30. I have.

However, as shown in FIG.
At 0, both the upper arm portion 301 and the lower arm portion 302 are formed to have sufficiently long dimensions. For this reason, the position close to the frame main body 30 is set to the guide shaft 2B.
(See dashed-dotted line LA in FIG. 1)
The guide shaft 2B is connected to the upper arm 30 as indicated by a dashed line.
1 and the lower arm 302, the guide shaft 2 </ b> B passes through a position far from the frame body 30 (see the two-dot chain line LB in FIG. 1).
Are engaged with the distal ends of the upper arm portion 301 and the lower arm portion 302 as indicated by the two-dot chain line.

Therefore, even if the distance between the pair of guide shafts 2A and 2B is different, the second bearing 3
Only the engagement position of 00 changes. Therefore, it is possible to cope with the case where the distance between the guide shafts 2A and 2B is different depending on one type of frame 3, so that the cost of the optical pickup device 1 does not increase.

In the example shown in FIG. 7, the engagement position of the second bearing 300 with the guide shaft 2B is flat, but at least one of the upper arm 301 and the lower arm 302 has A configuration may be adopted in which a concave portion through which the guide shaft 2B passes is formed in the vicinity of the root and on the tip side.

[0068]

As described above, according to the present invention, one of the bearings is configured to easily engage with the guide shaft passing through a position separated from the frame main body by different distances. Even if the distance between the pair of guide shafts differs depending on the type of the disk drive device, etc., it is not necessary to design and prepare a plurality of types of the entire frame, so that an increase in production cost can be prevented.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of an optical head device to which the present invention is applied.

FIGS. 2A, 2B, and 2C are a plan view, a left side view, and a right side view, respectively, of a frame used in an optical head device to which the present invention is applied.

FIG. 3 is an explanatory diagram of a second bearing of the frame used in the optical head device according to the first embodiment of the present invention.

FIGS. 4A, 4B, and 4C are explanatory views of a second bearing of a frame used in an optical head device according to a second embodiment of the present invention, and a guide is provided by the second bearing; FIG. 3 is an explanatory diagram showing a state corresponding to a case where the shaft passes through a position near the frame main body, and an explanatory diagram showing a state corresponding to a case where the guide shaft passes through a position far from the frame main body.

FIG. 5 is an explanatory diagram of a second bearing of a frame used in an optical head device according to Embodiment 3 of the present invention.

FIG. 6 is an explanatory diagram of a second bearing of a frame used in an optical head device according to a fourth embodiment of the present invention.

FIG. 7 is an explanatory diagram of a second bearing of a frame used in an optical head device according to a fifth embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 optical head device 2A, 2B guide axis 3 frame 4 laser diode (light source) for DVD 5 laser diode (light source) for CD 6 common optical path 7 collimating lens 8 rising mirror 9 objective lens 10 sensor lens 11 light receiving element 12 diffraction Lattice (optical element) 20 Light guide system 21 Half mirror 22 Prism 30 Frame body 35 Holder support member 70 Objective lens driving device 71 Lens holder 300 Second bearing (one bearing) 300A, 300B Bearing 301 Upper arm (one of the two) Arm part) 302 Lower arm part (the other arm part) 302A, 302B Arm part 360 Base part 361, 362, 363, 364 of second bearing Through hole 371, 372 Screw hole 391, 392 First bearing L1 First L2 Second laser light L10 Optical axis of first laser light 20 the optical axis of the second laser beam

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshihiko Okina 5329 Shimosuwa Town, Suwa County, Nagano Prefecture Inside Sankyo Seiki Seisakusho Co., Ltd. (72) Inventor Ikuo Kasuga 5329 Shimo Suwa Town, Suwa County, Nagano Prefecture Sankyo Seiki Seisakusho Co., Ltd. F term (reference) 5D118 AA06 BA01 BF02 BF03 FA03 FA05 5D119 AA38 AA40 BA01 DA01 DA05 MA04 NA02 NA07

Claims (8)

[Claims] 1. A light source, a lens driving device that drives an objective lens that causes light emitted from the light source to converge on an optical recording medium, a light receiving element that receives light returned from the optical recording medium, the light source, and the lens A light having a driving device, and frames each having first and second bearings respectively engageable with a pair of guide shafts disposed substantially parallel to both ends of a frame main body on which the light receiving element is mounted. The optical head device according to claim 1, wherein one of the first bearing and the second bearing is detachable from the frame body. 2. A light source, a lens driving device for driving an objective lens that causes light emitted from the light source to converge on an optical recording medium, a light receiving element for receiving return light from the optical recording medium, the light source, and the lens A light having a driving device, and frames each having first and second bearings respectively engageable with a pair of guide shafts disposed substantially parallel to both ends of a frame main body on which the light receiving element is mounted. In the head device, one of the first bearing and the second bearing is formed so as to be capable of changing a mounting position with respect to the frame body, so that the bearing is separated from the frame body by different distances. An optical head device, which can be engaged with a guide shaft passing through an inclined position. 3. A light source, a lens driving device for driving an objective lens that causes light emitted from the light source to converge on an optical recording medium, a light receiving element receiving light returned from the optical recording medium, the light source, and the lens A light having a driving device, and frames each having first and second bearings respectively engageable with a pair of guide shafts arranged substantially parallel to both ends of a frame main body on which the light receiving element is mounted. In the head device, one of the first bearing and the second bearing includes an upper arm and a lower arm that sandwich the guide shaft from above and below, and the upper arm and the lower arm. One of the side arms is formed integrally with the frame main body with a dimension capable of contacting a guide shaft passing through a position separated by a different distance from the frame main body, and the other arm is formed. Department The optical head device being characterized in that it is detachably formed with respect to the frame body or the first arm. 4. A light source, a lens driving device for driving an objective lens that causes light emitted from the light source to converge on an optical recording medium, a light receiving element for receiving return light from the optical recording medium, the light source, and the lens A light having a driving device, and frames each having first and second bearings respectively engageable with a pair of guide shafts disposed substantially parallel to both ends of a frame main body on which the light receiving element is mounted. In the head device, one of the first bearing and the second bearing includes an upper arm and a lower arm that sandwich the guide shaft from above and below, and the upper arm and the lower arm. One of the side arms is formed integrally with the frame main body with a dimension capable of contacting a guide shaft passing through a position separated from the frame main body by different distances, and the other arm is formed. Department The mounting position with respect to the frame main body or the one arm portion is formed so as to be changeable, so that it can be brought into contact with a guide shaft passing through a position at a different distance from the frame main body. An optical head device comprising: 5. The frame according to claim 3, wherein an upper arm of the upper arm and the lower arm is formed integrally with the frame body as the one arm. Optical head device. 6. A light source, a lens driving device for driving an objective lens for converging light emitted from the light source to an optical recording medium, a light receiving element for receiving return light from the optical recording medium, the light source, and the lens A light having a driving device, and frames each having first and second bearings respectively engageable with a pair of guide shafts disposed substantially parallel to both ends of a frame main body on which the light receiving element is mounted. In the head device, one of the first bearing and the second bearing is configured to be engageable with a guide shaft passing through a position separated by a different distance from the frame main body. An optical head device comprising: 7. The method for manufacturing an optical head device according to claim 1, wherein a plurality of types of bearings having different lengths are prepared as the one of the bearings, and the pair of the plurality of types of bearings are prepared. A bearing corresponding to the distance between the guide shafts is selected and attached to the frame main body. 8. The method for manufacturing an optical head device according to claim 3, wherein a plurality of types of arm portions having different lengths are prepared as the other arm portion. A method of selecting an arm corresponding to a distance between the pair of guide shafts and attaching the selected arm to the frame body or the one arm.