JP2005122859A - Optical pickup device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical pickup device whose optical pickup can be miniaturized while assuring a function of an optical base in the optical pickup. <P>SOLUTION: In this optical pickup device, a guide groove which extends in the radial direction of a disk-shaped recording medium is formed in a frame formed with an opening which accommodates a lens and an actuator, and is constituted so as to engage with a countershaft guide section formed in a chassis. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical pickup device used in an optical recording / reproducing apparatus such as a compact disc player, a mini disc player, and a DVD player.

In recent years, with the downsizing and thinning of optical recording / reproducing devices, there has been an increasing demand for miniaturization of the optical pickup device itself.
Hereinafter, a specific usage example of the conventional optical pickup device will be described with reference to FIGS. 5 and 6 using a mini-disc portable player. FIG. 5 is an exploded perspective view showing a part of a mini-disc portable player using a conventional optical pickup device. FIG. 6 is a perspective view showing a conventional optical pickup device.

  FIG. 5 shows an optical pickup device and its driving mechanism in a conventional mini-disc portable player. As shown in FIG. 5, a spindle motor 102, an optical pickup 103, a drive shaft 104 for driving the optical pickup 103, a reduction gear 106, a feed motor 107, and the like are mounted on the chassis 101. Further, the spindle motor 102 is provided with a turntable 120 on which a disk, which is an optical recording medium on which data is recorded, is placed and rotated. Further, the drive shaft 104 is formed with a drive gear 108 at one end, and the rotation of the feed motor 107 is decelerated between the reduction gear 106 and the drive gear 108 and transmitted to the drive shaft 104. Yes. By rotating the drive shaft 104 in this way, the optical pickup 103 can move in the tracking direction (the radial direction of the disc) in order to read the disc on which data is recorded.

The optical pickup 103 in the conventional optical pickup device configured as described above will be described with reference to FIG.
The conventional optical pickup 103 shown in FIG. 6 is provided with an optical base 109 as a basic base, a light emitting element 110 that emits laser light to the optical base 109, and a focus of the laser light on a disk on the turntable. , A light receiving element 111 that receives laser light reflected from the disk via the lens 112, and a focusing direction (direction perpendicular to the recording surface of the disk) and a tracking direction (radial direction of the disk). ) Is provided with an actuator 113 for fine adjustment. In addition, a support hole 109a through which the drive shaft 104 passes is formed in the optical base 109, and a screw that engages with the drive shaft 104 is formed on the inner surface of the support hole 109a. A countershaft guide receiver 109b protrudes from the end of the optical base 109 opposite to the support hole 109a and is arranged to engage with a countershaft guide section 105c provided on the chassis 101. The optical base 109 is formed with an outer frame 109c that houses and protects the lens 112 and the actuator 113.

The optical pickup 103 moves in the tracking direction (the radial direction of the disk) to the desired track position of the disk on which data is recorded by the rotation of the drive shaft 104. Further, the actuator 113 is driven and controlled by a servo circuit (not shown) to move the lens 112 to a desired position. Thus, the laser light emitted from the light receiving element 111 passes through the position-controlled lens 112 and is condensed and reflected at an appropriate place on the recording surface of the disk. The reflected light also passes through the lens 112 and is received by the light receiving element 111.
JP-A-11-110778

The optical pickup 103 in the conventional optical pickup device configured as described above is provided with a support hole 109a and a secondary shaft guide receiver 109b in the optical base 109 so that the optical pickup 103 can slide with respect to the chassis 101. Is held in. The countershaft guide receiver 109b protrudes from the outer frame 15 that houses the lens 112 and the actuator 113 therein. In the optical pickup 103, the support hole 109a, the countershaft guide receiver 109b, and the outer frame 109c are all indispensable, and these cannot be omitted, and further downsizing is difficult.
The optical pickup device of the present invention provides an optical pickup device that can achieve miniaturization with a configuration that satisfies the functions of the support hole 109a, the countershaft guide receiver 109b, and the outer frame 109c in the conventional optical pickup. With the goal.

In order to achieve the above object, an optical pickup device according to the present invention has a guide groove extending in the radial direction of a disk-shaped recording medium formed in a frame that forms an opening for housing a lens and an actuator, and a chassis It is comprised so that the countershaft guide part formed in this may be engaged.
The optical pickup device according to claim 1 of the present invention is provided in a chassis on which a spindle motor and a feed motor for rotating the turntable are mounted, and the diameter of the disc-shaped recording medium placed on the turntable. An optical pickup device having an optical pickup driven by the feed motor in a direction,
An actuator for driving a lens in the tracking direction and the focusing direction of the disc-shaped recording medium;
It is configured to be screwed into a drive shaft that is rotated by the feed motor, and to move in the radial direction of the disk-shaped recording medium by the rotation of the drive shaft, and has an opening that accommodates the lens and the actuator, A guide groove extending in a radial direction of the disk-shaped recording medium is provided in a frame forming an opening, and a countershaft guide portion extending in the radial direction of the disk-shaped recording medium and the guide groove are formed in the chassis. And an optical pickup having an optical base to be engaged. According to the present invention configured as described above, it is possible to provide an optical pickup device that achieves miniaturization with a simple configuration. Further, the auxiliary shaft of the optical pickup can be reliably guided by the frame while ensuring the strength of the optical pickup and securely protecting the actuator.

  According to a second aspect of the present invention, in the optical pickup device according to the second aspect, the guide groove of the first aspect is formed at an end of the optical base, and the side parallel to the radial direction of the disc-shaped recording medium in the rectangular frame body Is formed throughout. According to the present invention configured as described above, it is possible to provide an optical pickup device that achieves downsizing with a simple configuration, and it is possible to stably drive and control the optical pickup. Further, the auxiliary shaft of the optical pickup can be reliably guided by the frame while ensuring the strength of the optical pickup and securely protecting the actuator.

  According to a third aspect of the present invention, in the optical pickup device according to the first or second aspect, the groove bottom surface of the guide groove of the first or second aspect penetrates, and the guide groove inner space and the actuator installation space communicate with each other. . According to the present invention configured as described above, it is possible to provide an optical pickup device that achieves miniaturization with a simple configuration.

  According to a fourth aspect of the present invention, there is provided an optical pickup device according to any one of the first to third aspects, wherein the actuator is arranged on a part of the frame body on which the guide groove is formed. It has a protrusion protruding in the installation direction. According to the present invention configured as described above, it is possible to provide an optical pickup device that achieves miniaturization with a simple configuration and to increase the rigidity of the optical pickup. Further, the auxiliary shaft of the optical pickup can be reliably guided by the frame while ensuring the strength of the optical pickup and securely protecting the actuator.

  According to a fifth aspect of the present invention, there is provided an optical pickup device according to any one of the first to fourth aspects, wherein the guide groove according to any one of the first to fourth aspects has a narrow portion at least in a part, and is a sub-shaft formed in the chassis. The contact portion with the guide portion has a shape limited to at least a part. According to the present invention configured as described above, it is possible to provide an optical pickup device that achieves downsizing with a simple configuration, and it is possible to stably drive and control the position control of the optical pickup. Further, the contact position between the auxiliary shaft guide portion and the auxiliary shaft of the optical pickup becomes clear, and it becomes easy to adjust the shape of the auxiliary shaft guide portion when forming the auxiliary shaft guide portion.

In the optical pickup device of the present invention, a guide groove extending in the radial direction of the disc-shaped recording medium is formed in a frame body that forms an opening for accommodating a lens and an actuator, and is associated with a sub-axis guide portion formed in the chassis. Since the small optical base configured to match is provided, the optical pickup can be downsized while ensuring the strength of the optical pickup and securely protecting the actuator.
Further, in the optical pickup device of the present invention, the auxiliary shaft of the optical pickup can be reliably guided, the contact position between the auxiliary shaft guide portion and the auxiliary shaft becomes clear, and the shape of the auxiliary shaft guide portion is formed when the auxiliary shaft guide portion is formed. Adjustment processing can be easily performed.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments according to an optical pickup device of the invention will be described with reference to the accompanying drawings. In the following embodiments, an optical pickup device used for a mini-disc portable player will be described. However, the optical pickup device of the present invention is not used only for such a device, and is used for a compact disc player, a DVD player, etc. It can be applied to an optical recording / reproducing apparatus. In the following embodiments, a disk-shaped optical recording medium used as a recording medium is simply referred to as a disk.

Embodiment 1
Hereinafter, a specific use example of the optical pickup device according to the first embodiment of the present invention will be described using a mini-disc portable player with reference to FIGS. FIG. 1 is an exploded perspective view showing a part of a mini-disc portable player using the optical pickup device of the first embodiment. FIG. 2 is a perspective view showing the optical pickup in the optical pickup device of the first embodiment.

FIG. 1 shows the optical pickup device and its drive mechanism of Embodiment 1 in a mini-disc portable player.
As shown in FIG. 1, a chassis 1 in a mini-disc portable player has a spindle motor 2 having a turntable 20 for coaxially mounting and rotating a disc, an optical pickup 3 for recording / reproducing the disc, and this optical pickup. A drive shaft 4, a reduction gear 6, a feed motor 7 and the like for driving 3 are mounted. The chassis 1 shown in FIG. 1 shows a state viewed from the back side, and shows a state in which the disk mounting surface of the turntable 20 faces downward. The spindle motor 2 is attached to three support portions 21 a, 21 b and 21 c having a predetermined height formed in the chassis 1, and the turntable 20 is disposed at a desired position with respect to the chassis 1. The feed motor 7 is attached to the two support portions 22 a and 22 b, and is arranged so as to mesh with the reduction gear 6. The chassis 1 is provided with a first drive shaft support portion 5a and a second drive shaft support portion 5b that support the drive shaft 4 in the vicinity of both ends thereof. Further, the chassis 1 is formed with a countershaft guide portion 5c extending in parallel with the radial direction of the disk placed on the turntable 20, and formed on the subshaft guide portion 5c and the optical pickup 3. Further, a guide groove 9b, which will be described later, is configured to be engaged.

  In FIG. 1, one end of the drive shaft 4 is rotatably held by a first drive shaft support portion 5a, and a drive gear 8 that meshes with the reduction gear 6 is formed at the other end of the drive shaft 4. . The vicinity of the drive gear 8 is rotatably supported by the second drive shaft support portion 5b. The rotational driving force from the feed motor 7 is configured to be decelerated between the reduction gear 6 and the drive gear 8 and transmitted to the drive shaft 4. As the drive shaft 4 rotates in this manner, the optical pickup 3 moves to a desired track position on the disk.

The optical pickup 3 in the optical pickup device of the first embodiment configured as described above will be described with reference to FIG.
The optical pickup 3 according to Embodiment 1 shown in FIG. 2 is provided with an optical base 9 as a basic base, and is placed on a light emitting element 10 that emits laser light to the optical base 9 and a turntable 20. A lens 12 for focusing the laser beam on the disc, a light receiving element 11 for receiving the laser beam reflected from the disc through the lens 12, and a focusing direction (a direction perpendicular to the recording surface of the disc). ) And an actuator 13 for fine adjustment in the tracking direction (disk radial direction).

A support hole 9a through which the drive shaft 4 passes is formed in the optical base 9, and a screw that engages with the drive shaft 4 is formed on the inner surface of the support hole 9a. In the optical base 9, a light emitting element 10 and a light receiving element 11 are disposed at a substantially central portion, and an opening 9c is formed on the opposite side of the support hole 9a between the light emitting element 10 and the light receiving element 11. ing. The opening 9c houses a lens 12 and an actuator 13 for finely adjusting and controlling the lens 12. Thus, the optical base 9 is provided with a rectangular frame 9d that forms an opening 9c for accommodating the lens 12 and the actuator 13. A guide groove 9b is formed at a position at the end of the optical base 9 in the frame body 9d. That is, the guide groove 9b is extended at a position parallel to the radial direction of the disk placed on the turntable 20 on one side of the rectangular frame 9d of the frame 9d. Accordingly, one side of the frame body 9d in which the guide groove 9b is formed serves as the auxiliary axis of the optical pickup 3. The guide groove 9b is arranged to engage with a countershaft guide portion 5c provided in the chassis 1. The bottom surface of the groove in the guide groove 9b penetrates, and the internal space of the guide groove 9b and the opening 9c communicate with each other. That is, the internal space of the guide groove 9b communicates with the space (opening 9c) in which the actuator 13 is disposed. Therefore, the depth of the groove in the guide groove 9b is large.

An operation of the optical pickup device in the optical pickup device of the first embodiment configured as described above will be described.
When a disk is placed on the turntable 20 and a recording or reproduction command is issued for the disk, the feed motor 7 is driven to rotate the drive shaft 4 via the reduction gear 6 and the drive gear 8. As the drive shaft 4 rotates, the optical pickup 3 moves in the tracking direction (disk radial direction) to a desired track position on the disk. Further, the actuator 13 is driven and controlled by a servo circuit (not shown), and the lens 12 is finely adjusted in a focusing direction (a direction orthogonal to the recording surface of the disk) and a tracking direction (a radial direction of the disk). Move to position. The laser light emitted from the light receiving element 11 by the lens 12 arranged at a desired position in this manner passes through the position-controlled lens 12 and is condensed and reflected at an appropriate location on the recording surface of the disk. The reflected light passes through the lens 12 and is received by the light receiving element 11, and recording or reproducing operation is performed.

As described above, in the optical pickup device of the first embodiment, the guide groove is formed inside the portion of the frame 9d that houses the lens 12 and the actuator 13 that is parallel to the radial direction of the disk placed on the turntable 20. 9b is extended. The guide groove 9b is disposed so as to engage with the countershaft guide portion 5c provided in the chassis 1, and reliably guides the moving direction of the optical pickup 3. Therefore, in the optical pickup device of the first embodiment, the guide groove 9b is formed inside the frame body 9d and is configured not to protrude from the frame body 9d.
Therefore, in the optical pickup device of the first embodiment, since the guide groove that engages with the countershaft guide portion 5c is formed in the frame 9d necessary for housing the lens 12 and the actuator 13, the optical pickup device The optical base 9 of the pickup 3 can be formed in a small size, and the optical pickup device can be downsized and, in turn, the optical recording / reproducing device can be downsized. In FIG. 2, the dimension indicated by symbol a is formed smaller than that of a conventional optical pickup.
In the optical pickup device of the first embodiment, the example in which the bottom surface of the groove in the guide groove 9b penetrates has been described. However, the present invention is not limited to such a configuration, and the bottom surface of the groove penetrates. Even with a configuration that is not, it is possible to achieve a reduction in the size of the device that is the object of the present invention.

<< Embodiment 2 >>
Next, an optical pickup device according to Embodiment 2 of the present invention will be described with reference to FIG.
FIG. 3 is a perspective view showing the optical pickup 30 in the optical pickup device of the second embodiment. In the optical pickup device according to the second embodiment, the difference from the first embodiment is that a projection 9e is formed on the optical base 9, and the rest is the same as the configuration of the first embodiment. Therefore, in the description of the second embodiment, parts having the same functions and configurations as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 3, the optical pickup 30 in the optical pickup device of the second embodiment is similar to the optical pickup 3 of the first embodiment in that the optical base 9 has a light emitting element 10, a light receiving element 11, a lens 12, and An actuator 13 is provided. The optical base 9 has a support hole 9a through which the drive shaft 4 passes, and an opening 9c formed on the opposite side of the support hole 9a with the light emitting element 10 and the light receiving element 11 interposed therebetween. The lens 9 and the actuator 13 are accommodated in the opening 9c, and the opening 9c is formed by a rectangular frame 9d. A guide groove 9b is formed at the end of the optical base 9 in the frame body 9d. The guide groove 9b is disposed so as to engage with the countershaft guide portion 5c provided in the chassis 1. Yes.

  In the second embodiment, a projection 9e protruding toward the actuator 12 is formed at a substantially central portion of the guide groove 9b. The rigidity of the guide groove 9b is increased to ensure the strength of the frame body 9d. The lens 12 and the actuator 13 housed inside are securely protected. In the optical pickup device of the second embodiment, the protrusion 9e protrudes toward the actuator 12 at the substantially central portion of the guide groove 9b, and the lens 12 and the actuator 13 facing the protrusion 9e have a concave shape. A gap is formed between the tip of the protrusion 9e and the lens 12 or the actuator 13. For this reason, it is comprised so that the protrusion 9e and the lens 12 or the actuator 13 may not contact by the movement of the lens 12. FIG.

  As described above, in the optical pickup device of the second embodiment, the optical pickup 30 can be downsized while ensuring the strength of the optical pickup 30 and reliably protecting the lens 12 and the actuator 13. In the optical pickup device of the second embodiment, since the projection 9e that protrudes toward the lens 12 is formed at a substantially central portion of the guide groove 9b, the strength of the frame 9d is further increased than the configuration of the first embodiment. In particular, in the case where the bottom surface penetrates so that the guide groove 9b communicates with the opening 9c, a great effect is exhibited.

<< Embodiment 3 >>
Next, an optical pickup device according to Embodiment 3 of the present invention will be described with reference to FIG.
FIG. 4A is a perspective view showing the optical pickup 31 in the optical pickup device of the third embodiment. FIG. 4B is an enlarged view of a part (A) of FIG. In the optical pickup device according to the third embodiment, the difference from the first embodiment described above is that a projection 9f is formed on the optical base 9, and the rest is the same as the configuration of the first embodiment. Therefore, in the third embodiment, parts having the same functions and configurations as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 4, the optical pickup 31 in the optical pickup device of the third embodiment is similar to the optical pickup 3 of the first embodiment in that the optical base 9 has a light emitting element 10, a light receiving element 11, a lens 12, and An actuator 13 is provided. The optical base 9 has a support hole 9a through which the drive shaft 4 passes, and an opening 9c formed on the opposite side of the support hole 9a with the light emitting element 10 and the light receiving element 11 interposed therebetween. The lens 9 and the actuator 13 are accommodated in the opening 9c, and the opening 9c is formed by a rectangular frame 9d. A guide groove 9b is formed at the end of the optical base 9 in the frame body 9d. The guide groove 9b is disposed so as to engage with the countershaft guide portion 5c provided in the chassis 1. Yes. In the third embodiment, projections 9f and 9f projecting in a direction facing the substantially central portion inside the guide groove 9b are formed. That is, in Embodiment 3, the protrusions 9f and 9f are formed on the inner surfaces of both sides of the substantially central portion of the guide groove 9b, and the convex portion of the auxiliary shaft guide portion 5c slides between the tips of the protrusions 9f and 9f on both sides. Configured to work.

  As described above, in the optical pickup device of the third embodiment, the protrusions 9f and 9f are formed in the guide groove 9b of the optical pickup 31, and the auxiliary shaft guide portion 5C slides between the tips of the protrusions 9f and 9f. Therefore, the contact portion of the optical pickup 31 with the auxiliary shaft guide portion 5c becomes clear, and the width of the auxiliary shaft guide portion 5c can be easily increased when the auxiliary shaft guide portion 5c in the chassis 1 is formed. It becomes easy to adjust the accuracy.

  An optical pickup device according to the present invention is a compact disc player, a mini disc player, a DVD player, and the like for achieving the downsizing of the optical pickup while ensuring the strength of the optical pickup and securely protecting the actuator. It is useful for the optical recording / reproducing apparatus.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing a part of a mini-disc portable player using an optical pickup device according to a first embodiment of the present invention. FIG. 3 is a perspective view showing an optical pickup in the optical pickup device of the first embodiment. It is a perspective view which shows the optical pick-up 30 in the optical pick-up apparatus of Embodiment 2 which concerns on this invention. (A) is the perspective view which shows the optical pick-up 31 in the optical pick-up apparatus of Embodiment 3 which concerns on this invention, (b) is the figure which expanded and showed a part (A) of (a). It is a disassembled perspective view which shows a part of mini disk portable player using the conventional optical pick-up apparatus. It is a perspective view which shows the conventional optical pick-up apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chassis 2 Spindle motor 3 Optical pick-up 4 Drive shaft 5a 1st drive shaft support part 5b 2nd drive shaft support part 5c Subshaft guide part 6 Reduction gear 7 Feed motor 8 Drive gear 9 Optical base 9a Support hole 9b Guide Groove 9c Opening 9d Frame 9e Protrusion 9f Protrusion 10 Light emitting element 11 Light receiving element 12 Lens 13 Actuator 20 Turntable 30 Optical pickup 31 Optical pickup

Claims (5)

An optical pickup having an optical pickup provided in a chassis on which a spindle motor and a feed motor for rotating the turntable are mounted and driven by the feed motor in the radial direction of a disk-shaped recording medium placed on the turntable A device,
An actuator for driving a lens in the tracking direction and the focusing direction of the disc-shaped recording medium;
It is configured to be screwed into a drive shaft that is rotated by the feed motor, and to move in the radial direction of the disk-shaped recording medium by the rotation of the drive shaft, and has an opening that accommodates the lens and the actuator, A guide groove extending in a radial direction of the disk-shaped recording medium is provided in a frame forming an opening, and a countershaft guide portion extending in the radial direction of the disk-shaped recording medium and the guide groove are formed in the chassis. An engaging optical base;
An optical pickup device having an optical pickup comprising: The optical pickup device according to claim 1, wherein the guide groove is formed at an end portion of the optical base, and is formed on the entire side parallel to the radial direction of the disk-shaped recording medium in the rectangular frame. 3. The optical pickup device according to claim 1, wherein a groove bottom surface of the guide groove penetrates, and the guide groove inner space and the actuator installation space communicate with each other. The optical pickup device according to any one of claims 1 to 3, wherein the optical base has a protrusion projecting in a direction in which the actuator is disposed on a part of the frame in which the guide groove is formed. 5. The shape according to claim 1, wherein the guide groove has a narrow portion at least at a part, and has a shape in which a contact portion with the countershaft guide portion formed on the chassis is limited to at least a part. Optical pickup device.

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