JPH04109433A - Guide device for optical pickup device - Google Patents

Abstract

PURPOSE:To facilitate an inclining adjustment of a guide shaft in simple constitution by turning a cam body under its contact state with an abutting part around an axial center of the guide shaft and changing the distance from an abutting part on the other side of the guide shaft. CONSTITUTION:The guide shaft 7 for slidably supporting an optical pickup device 5 is arranged on a chassis 1, and is positioned by a holding part 8C disposed on the chassis 1 and a mounting part 12. In addition, a cam part that is eccentric to the axial center of the guide shaft 7 is fitted to the guide shaft 7, and is moved on the chassis 1 by a turning operation of the cam body 9, which is to be abutted against the abutting part 8a errected on the chassis 1, around the axial center of the guide shaft 7. Then, a moving locus of the optical pickup device 5 is changed. By this method, the inclining adjustment of the guide shaft 7 is facilitated in simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a guide device for an optical pickup device that supports the optical pickup device by making it possible to adjust the tilt of the device with respect to a chassis.

B. Summary of the Invention The present invention provides a guide device for an optical pickup device that movably supports an optical pickup device, in which one end side of a guide shaft that slidably supports the optical pickup device is provided with a guide disposed on a chassis. The other end of the guide shaft is held by the shaft holding part, and the other end is brought into contact with a mounting part protruding from the chassis. The guide shaft can be moved by attaching it to the end side and making it abut against an abutting part arranged on the chassis, and rotating the cam body around the axis of the guide shaft while keeping it in contact with the abutting part. By changing the distance from the abutting portion on the other end side, the inclination of the guide shaft can be easily adjusted with a simple configuration.

The present invention also provides a guide device for an optical pickup device in which an optical pickup device support plate is movably attached to a chassis, and both ends of a guide shaft that slidably supports the optical pickup device are connected to the optical pickup device support plate. A first cam body having a cam part that is eccentric with respect to the axis of the guide shaft is brought into contact with a first abutting part arranged in a pair on the top of the guide shaft. A second cam portion is attached to the optical pickup device and has a cam portion eccentric to the axis of the guide shaft.
By attaching the cam bodies to this guide shaft and bringing them into contact with the second abutting parts protruding from the chassis, each of these cam bodies can be brought into contact with the optical pickup device support plate and the second abutting parts, respectively. By rotating the guide shaft around the axis while the guide shaft remains in contact with the optical disc, the light flux emitted from the optical pickup device can be easily adjusted even if the distance of the guide shaft from the optical pickup device support plate is changed. The position on the optical recording medium does not change.

C1 Prior Art Conventionally, there has been an optical pickup device, and an optical disk recording device is configured such that information signals can be written to and/or read from an optical disk, which is an optical recording medium, using this optical pickup device. and/or playback devices have been proposed.

Such an optical disc recording and/or reproducing device is
As shown in the figure, it has a chassis 101, and a rotary drive device 102 that holds and rotates the optical disk is provided on the chassis 101.

The rotary drive device 102 includes a spindle motor 103 attached to the sawmill 101 and a disk table 104 attached to a drive shaft 103a of the spindle motor 103. Above disk table 1
An optical disk (not shown) is placed and held on 04. The optical disc held on the disc table 104 is rotated together with the disc table 104 when the spindle motor 103 is driven to rotate.

An optical pickup device 105 is provided on the chassis 101. The optical pickup device 105 includes an optical system block section 105a, and a predetermined optical system including a light source such as a semiconductor laser (not shown) and an objective lens 106 that guides the light beam emitted from the light source. It is configured with built-in devices, photodetectors, etc. The optical pickup device 105 makes the objective lens 106 face the optical disk held on the disk table 104, and condenses and irradiates the optical disk with a beam of light through the objective lens 106. The light beam reflected by the optical disk is configured to be detected by the photodetector. This optical pickup device 105 is configured to write and/or read information signals to and from the optical disc by irradiating a light beam onto the optical disc and detecting reflected light from the optical disc.

This optical pickup device 105 includes the chassis 10
It is movably supported by a guide shaft 107 disposed on 1. This guide shaft 107 is supported at both ends by a pair of guide shaft support members 08a and 108b provided on the chassis 101. The optical pickup device 105 includes the optical system block section 1
The guide shaft 10 is inserted into the support hole 105b provided in 05a.
7 is inserted through the guide shaft 107, and is slidable on the guide shaft 107. This optical pickup device 10
5 is connected to the chassis 1.5 along the guide shaft 107.
01, it is supported so as to be movable in the direction toward and away from the disk table 104, which is indicated by the arrow t in FIG. Therefore, this optical pickup device 105 is configured such that the objective lens 106 can be opposed to the inner and outer peripheries of the optical disc held on the disc table +04.

In this optical disc recording and/or reproducing apparatus, by rotating the optical disc and moving the optical pickup device 105 along the guide axis +07, information signals are transmitted over substantially the entire surface of the optical disc. It can be written and/or read.

D1 Problem to be Solved by the Invention By the way, in the optical disk recording and/or reproducing apparatus as described above, it is difficult to accurately maintain the distance between the objective lens 106 and the guide shaft 107 as indicated by the arrow in FIG. It's dripping. In this optical disk recording and/or reproducing apparatus, by accurately positioning the guide shaft 107 on the chassis 1, the beam spot emitted from the objective lens 106 is formed on the optical disk. It is necessary that the movement locus be on a straight line that includes the center of the disc table 104, that is, the center of the optical disc.

Here, as shown in FIG. 9, a straight line C including the center of the optical disc 109 and a movement trajectory B of the beam spot
If they match, the angle θ1 between the movement locus B of the beam spot at the inner circumference P1 of the optical disc 109 and the tangent to the recording track formed on the optical disc 109 and the angle θ1 of the optical disc 109 outer periphery P
The angles θ between the moving locus B of the beam spot and the tangent to the recording track formed on the optical disk 109 in , are equal to each other. That is, even if the optical pickup device 105 is moved around the inner and outer peripheries of the optical disc 109, the angle between the moving trajectory B of the beam spot and the tangent to the recording track is always constant.

However, as shown in FIG.
If the straight line C including the center of 9 does not match the moving trajectory B of the beam spot, the beam spot will be formed on the optical disk 109 and the moving trajectory B of the beam spot at the inner circumference Pi of the optical disk 109. The angle θ between the tangent of the recording track and the outer circumference P of the optical disc 109
The angles θ between the movement locus B of the beam spot and the tangent to the recording track formed on the optical disk 109 in No. 4 are different from each other. That is, when the optical pickup device 105 is moved around the inner and outer peripheries of the optical disc 109, the angle between the movement locus B of the beam spot and the tangent to the recording track gradually changes.

If the angle between the movement locus B of the beam spot and the tangent to the recording track changes, the optical pickup device 105 will notice this, especially when the tracking error signal is obtained by the so-called 3-beam system. It is no longer possible to obtain a good tracking error signal, and it is no longer possible to write and/or read information signals in a good manner.

Therefore, in such an optical disc recording and/or reproducing device, the guide shaft 107 is connected to the chassis 1.
01, it is necessary to accurately position and attach the disc table 104 as a reference. In this optical disc recording and/or reproducing apparatus, the mounting of the spindle motor 103 to the chassis 1.1 is performed with precision, the mounting of the disc table 104 to the drive shaft 103a is performed with precision, and the guide shaft is set to the disc lOI with precision. 107 is mounted in order to ensure positional accuracy between the disc tip 104 and the guide shaft 107 by improving accuracy.

However, in this way, this optical disc recording and/or
Alternatively, in order to achieve sufficient positional accuracy between the disc table 104 and the guide shaft 107 by improving the positional accuracy of the mounting between the respective structural members that make up the playback device, it is necessary to create the respective structural members. Also, it becomes difficult to assemble this optical disk recording and/or reproducing device.

In addition, if it is found that the positional accuracy between the disc table 104 and the guide shaft 107 is insufficient in the assembled optical disc recording and/or reproducing apparatus, the optical disc recording and/or reproducing apparatus is disassembled again. However, reassembly work such as replacing parts is required. Therefore, the assembly work of such an optical disk recording and/or reproducing apparatus is complicated.

In this optical disc recording and/or reproducing apparatus, the light flux emitted from the objective lens 106 and reflected by the optical disc 109 is
In order to return sufficiently to the beam spot on the optical disk 109, the optical pickup device 105 is tilted so that the optical axis of the objective lens 106 is perpendicular to the main surface of the optical disk 109. There is a possibility that the movement trajectory of the optical disc 109 may be shifted in the circumferential direction of the optical disc 109. Then, the movement trajectory of this beam spot,
There is a risk that the optical disc may deviate from the straight line that includes the center of the optical disc.

SUMMARY OF THE INVENTION The present invention is proposed in view of the above-mentioned circumstances, and aims to facilitate the manufacture and assembly of a device having an optical pickup device such as an optical disk recording and/or playback device. It is an object of the present invention to provide a guide device for an optical pickup device that allows the movement locus of a beam spot formed by the optical pickup device to be on a straight line including the center of an optical disk through easy operation.

E1 Means for Solving the Problems In order to solve the above problems and achieve the above objects, a guide device for an optical pickup device according to the present invention includes a chassis, a guide shaft holder disposed on the chassis, an abutting member protruding onto the chassis; a mounting portion disposed near the abutting portion; and an abutment member disposed on the chassis with one end held by the guide shaft holding portion and the other end thereof. a guide shaft that is positioned in contact with the mounting portion and slidably supports the optical pickup device; and a cam portion that is eccentric with respect to the axis of the guide shaft, and the other end side of the guide shaft a cam body attached to and abutted on the abutting portion;
A mounting member that elastically presses the guide shaft against the mounting portion and elastically presses the cam body against the abutment portion, the cam body is arranged around the axis of the guide shaft. When the guide shaft is rotated, the guide shaft is moved on the shear.

Further, the guide device for an optical pickup device according to the present invention includes a shear, an optical pickup device support plate that is movably supported with respect to the soybean, and an optical pickup device support plate that is elastically moved in one direction with respect to the soybean. a biasing means for biasing the optical pickup device; a first abutting portion disposed in a pair on the optical pickup device support plate; a second abutting portion protruding from the chassis; A guide shaft that is disposed on the pickup device support plate and is positioned with both ends thereof in contact with each of the first abutting portions, and slidably supports the optical pickup device; a first cam body having an eccentric cam portion attached to both ends of the guide shaft in a pair and abutting the optical pickup device support plate; and a first cam body eccentric with respect to the axis of the guide shaft. a second cam body having a cam portion attached to the guide shaft and pressed against the other side of the second abutting portion by the urging force of the urging means; a mounting member for elastically pressing the first cam body against the abutting portion of the optical pickup device supporting plate; The second cam body is rotated about the axis of the shaft to move the guide shaft on the optical pickup device support plate in a direction perpendicular to the axial direction, and the second cam body is rotated around the axis of the shaft. The optical pickup device support plate is moved on the chassis by being rotated about the axis of the optical pickup device.

F1 Effect In the guide device for an optical pickup device according to the present invention, the guide shaft that slidably supports the optical pickup device is disposed on a chassis, and the holding portion and the mounting portion are disposed on the chassis. Positioned by
A cam body having a cam part eccentric with respect to the axis of the guide shaft is attached to the guide shaft and comes into contact with an abutment part protruding from the chassis. Since the optical pickup device is moved on the chassis by the rotational operation, the movement locus of the optical pickup device is changed.

Further, in the guide device for an optical pickup device according to the present invention, the guide shaft that slidably supports the optical pickup device is disposed on the optical pickup device support plate that is movable with respect to the chassis. The guide shaft is positioned by being brought into contact with the first abutment parts protruding in a pair on the pickup device support plate, and has a cam part eccentric with respect to the axis of the guide shaft. The first cam bodies, which are attached in pairs and are in contact with the optical pickup device support plate, are rotated about the axis of the guide shaft, thereby increasing the distance from the optical pickup device support plate. a second abutting portion which is attached to the guide shaft and has a cam portion eccentric with respect to the axis of the guide shaft, and which abuts on a second abutment portion that protrudes above the chassis; By rotating the cam body around the axis of the guide shaft, the cam body is moved on the chassis together with the optical pickup device support plate, so that the cam body is rotated around the axis of the guide shaft. Changes in the trajectory of the beam spot formed by the optical pickup device are prevented.

G. Examples Specific examples of the present invention will be described below with reference to the drawings.

This example is an example in which an optical disc recording and/or reproducing apparatus is constructed using the guide device of the optical pickup device according to the present invention.

This optical disc recording and/or reproducing apparatus is constructed with a chassis l, as shown in FIG. A rotary drive device 2 is provided on the chassis 1 to hold and rotate an optical disk, which is an optical recording medium. This rotary drive device 2 includes a spindle motor 3 attached to the chassis I, and a disk table 4 attached to a drive shaft 3a of the spindle motor 3. On the disc table 4, an optical disc (not shown) is placed and held. The optical disc held on the disc table 4 is rotated together with the disc table 4 when the spindle motor 3 is driven to rotate.

An optical pickup device 5 is disposed on the chassis 1. This optical pickup device 5 has an optical system block part 5a, and a predetermined optical system including a light source such as a semiconductor laser (not shown) and an objective lens 6 that guides a light beam emitted from the light source is installed in the optical system block part a. It is configured with built-in devices, photodetectors, etc. The optical pickup device 5 has the objective lens 6 facing the optical disc held on the disc table 4, and condenses and irradiates the optical disc via the objective lens 6, and The light beam reflected by the optical disk is configured to be detected by the photodetector. The optical pickup device 5 is configured to write and/or read information signals to and from the optical disc by irradiating the optical disc with a beam of light and detecting reflected light from the optical disc.

The second optical pickup device 5 is movable as shown by the upward arrow in FIG. Supported. That is, the optical pickup device 5 includes the optical system block section 5.
The guide shaft 7 is inserted through a support hole 5b provided at one end of the support hole 5b, so that the guide shaft 7 can be slid on the guide shaft 7.

The guide shaft 7 is formed of a material such as metal into a cylindrical shape with a length corresponding to the radius of the on-road light distribution disk.

This guide shaft 7 is disposed on the chassis 1, and the first
As shown in the figure and FIG. and positioned.

A portion of the holding piece 8b is cut out in a V-shape to form a holding portion 8C. One end side of the guide shaft 7 is held in a sandwiched manner within the holding portion 8c.

On the other end side of the guide shaft 7, the mounting portion 12 is provided.
The cam body 9 is attached so that it does not come into contact with. The outer peripheral portion of the cam body 9 is a cylindrical cam portion 9a that is eccentric with respect to the axis of the guide shaft 7.

The cam body 9 has the cam portion 9 a in contact with an abutting portion 8 a projecting on the chassis 1 .

Further, the other end of the guide shaft 7 is provided with a rotation operation groove 7a. The rotation operation groove 7a is formed so as to be engaged with a tool such as a screwdriver for rotating a screw or the like.

At positions corresponding to both ends of the guide shaft 7 on the chassis 1, a pair of plate springs 10.1 are attached as members so as to face the holding piece 8b and the abutting portion 8a.
1 is attached with one end fixed. One end side of the guide shaft 7 is elastically pressed into the holding portion 8c by the leaf spring 11. In addition, the cam body 9
is elastically biased by the leaf spring 10, and the cam portion 9a
is pressed against the abutting portion 8a.

The chassis l is provided with an opening 1a corresponding to a movable area of the optical pickup device 5 so as not to impede movement of the optical pickup device 5 along the guide shaft 7.

A support groove 21 is provided on the other end side of the optical system block portion 5a and is formed in a direction along the edge of the opening 1a so as to be able to engage with the edge. The optical pickup device 5 is arranged in the support groove 21 or the opening 1a.
By engaging with the edge of the guide shaft 7, rotation about the guide shaft 7 is restricted.

In the optical disc recording and/or reproducing apparatus configured as described above, the optical pickup device 5 moves the disc along the guide shaft 7 to the chassis 1 as indicated by the arrow t in FIG. It can be moved in the direction toward and away from the table 4. Therefore, this optical pickup device 5 has the objective lens 6 extending over the inner and outer peripheries of the optical disc held on the disc table 4.
It is designed so that it can be used to face each other.

That is, in this optical disc recording and/or reproducing apparatus, by rotating the optical disc and moving the optical pickup device 5 along the guide shaft 7, information can be recorded over substantially the entire surface of the optical disc. It is possible to write and/or read signals.

In this optical disc recording and/or reproducing apparatus, the guide shaft 7 is held at one end by the holding section 8c, and while the other end remains in contact with the mounting section 2. It is movable to rotate in a direction parallel to the chassis l. Further, the cam body 9 has the abutting portion 8
The cam portion 9a is movable toward and away from the chassis 1 while remaining in contact with the side portion of the cam portion a.

When the cam body 9 is rotated, the guide shaft 7 is rotated about the holding portion 8c while remaining parallel to the chassis I, as shown by arrow E in FIG. It is moved and operated as follows. Therefore, in this optical disc recording and/or reproducing device, the cam body 9
is rotated around the axis of the guide shaft 7 together with the guide shaft 7, so that the optical pickup device 5 aligns the optical axis with the optical axis of the objective lens 6, as shown by arrow F in FIG. The movement locus of the formed beam spot can be changed so that it rotates about the holding part 8c within the range from the straight line f1 to the straight line f2 in FIG. 3.

In this way, by changing the movement locus of the beam spot, it is possible to adjust the movement locus so that it is on a straight line that includes the center of the disk table 4, as shown by neutral Mf in FIG. can.

By the way, in this optical disc recording and/or reproducing apparatus, the inclination of the optical pickup device 5 is adjusted so that the optical axis of the objective lens 6 and the optical disc placed on the disc table 4 perpendicularly intersect with each other. Is there a need to do that? Such adjustment of the inclination can be done, for example, by changing the distance of the guide shaft 7 to the chassis 1.
This is done by rotating the optical pickup device 5 about the support groove 21. However, if the distance of the guide shaft 7 to the chassis 1 is changed, the beam spot formed by the light beam emitted by the optical pickup device 5 will change on the optical disc mounted on the disc table 4. move in the circumferential direction.

When the beam spot moves in the circumferential direction of the optical disc on the optical disc, the locus of movement of the beam spot deviates from a straight line that includes the center of the optical disc.

In the guide device for an optical pickup device according to the present invention, the tilt of the optical pickup device can be adjusted while keeping the movement locus of the beam spot aligned with a straight line including the center of the optical disk.

That is, an optical disc recording and/or reproducing device configured using the guide device of this optical pickup device is as follows:
As shown in FIG. 4, the rotary drive device 2 is arranged in a chassis.

On the chassis 1, an optical pickup device support plate 1 is mounted.
5 is disposed so as to be movable in a direction parallel to the shear 1. That is, the optical pickup device support plate 1
5 has a support shaft 18 that protrudes laterally from the negative side, and this support shaft 18 is connected to the chassis 1.
It is supported by a support piece 19 provided above. This support piece 19 has a groove-shaped holding portion, and the support shaft 18 is held in such a manner that it is sandwiched within this holding portion. The support shaft 18 is slidable in the axial direction with respect to the support piece 19. Further, the optical pickup device support plate 15 is connected to the support shaft 1.
The compression coil spring 17 is compressed and disposed between the side facing the chassis 1 and the spring support piece 16 protruding from the chassis 1. is elastically biased.

The optical pickup device 5 is disposed on the optical pickup device 15. This optical pickup device 5 is configured similarly to the optical pickup device 5 in the example described above.

This optical pickup device 5 is movably supported by a guide shaft 7 that is disposed on the optical pickup device 15 and constitutes a guide device of the optical pickup device according to the present invention.

That is, the optical pickup device 5 is configured to be able to slide on the guide shaft 7 by inserting the guide shaft 7 into a support hole 5b provided at one end of the optical system block portion 5a.

The guide shaft 7 is formed into a cylindrical shape with a length corresponding to the radius of the on-road light distribution disk. This guide shaft 7 is disposed on the optical pickup device support plate 15, and the fourth
As shown in FIGS. 6 to 6, the optical pickup device is positioned by bringing its both ends into contact with the sides of the first abutment members 8a and 8b, which are protruded in a pair on the optical pickup device support plate 15. .

A pair of first cam bodies 9 and 13 are attached to both ends of the guide shaft 7 so as not to come into contact with the first abutting members 8a and 8b. These first
The outer periphery of the cam body 9.13 is formed into cylindrical cam portions 9a, 13a eccentric to the axis of the guide shaft 7. The directions of eccentricity of each of these cam portions 9a, 13a with respect to the guide shaft 7 are made equal to each other.

A second cam body 14 is attached to the guide shaft 7. The outer peripheral portion of the second cam body 14 is a cylindrical cam portion 14a that is eccentric with respect to the axis of the guide shaft 7. The eccentric direction of the cam portion 14a with respect to the guide shaft 7 is determined by the direction of eccentricity of the cam portion 14a with respect to the guide shaft 7.
With respect to the direction of eccentricity of 13a with respect to the guide shaft 7,
A predetermined angle variation is made.

The second cam body 14 has the cam portion 14 a in contact with the other side of a second abutting portion 20 protruding from the chassis 1 . The second abutting portion 20 is inserted into the optical pickup device support plate 15 through an opening 15a provided in order to prevent movement of the optical pickup device 5 along the guide shaft 7 from being obstructed. , protrudes above the optical pickup device support plate 15.

The second cam body 14 is pressed against the second abutting portion 20 by the urging force of the compression coil spring 17 that urges the optical pickup device support plate 15 to move relative to the shear 1. There is.

A pair of plate springs 10 are mounted on the optical pickup device support plate 15 at positions corresponding to both ends of the guide shaft 7 so as to face the first abutting members 8a and 8b. 11 or is attached with the end side fixed. The guide shaft 7 is elastically pressed against the sides of the pair of abutting members 8a, 8b by these leaf springs 10.11. Further, the first cam bodies 9 and 13 are elastically biased by the plate springs 10 and 11 via the guide shaft 7, and the respective cam portions 9a are biased.

13a is pressed against the optical pickup device support plate I5.

A support groove 21 is provided on the other end side of the optical system block portion 5a and is formed in a direction along the edge of the opening 15a so as to be able to fit onto the edge. The optical pickup device 5 is arranged between the support groove 21 and the opening +
By engaging with the edge of 5a, rotation of the guide shaft 7 about the axis is restricted.

In the optical disc recording and/or reproducing apparatus configured as described above, the optical pickup device 5 moves the disc along the guide shaft 7 to the chassis 1 as indicated by the arrow t in FIG. It can be moved in the direction toward and away from the table 4. Therefore, this optical pickup device 5 has the objective lens 6 extending over the inner and outer peripheries of the optical disc held on the disc table 4.
By rotating the optical disc and moving it along the guide shaft 7, information signals can be written and/or read over substantially the entire surface of the optical disc. .

In this optical disc recording and/or reproducing apparatus, both ends of the guide shaft 7 remain in contact with the sides of the first abutment portions 8a and 8b, respectively, and
It is movable toward and away from the optical pickup device support plate 15.

Further, the first cam body 9.13 is movable in the direction along the optical pickup device support plate 15 while keeping each cam portion 9a13a in contact with the upper surface of the optical pickup device support plate 15. It is. Therefore, in this optical disc recording and/or reproducing apparatus, by rotating the guide shaft 7 about its axis, the first cam body 9°I3 is rotated together with the guide shaft 7. , the height of the guide shaft 7 relative to the optical pickup device support plate 15 can be changed.

The optical pickup device support plate 15 of the guide shaft 7
When the height of the optical pickup device 5 is changed, the inclination of the optical pickup device 5 is changed so that the optical pickup device 5 rotates about the support groove portion 21.

Here, the height of the guide shaft 7 with respect to the optical pickup device support plate 15 is changed as shown by ΔH in FIG. 7 to tilt the optical pickup device 5 with respect to the optical pickup device support plate 15. By changing ,
In the optical disc mounted on the disc full 4, the beam spot formed by the light beam emitted by the optical pickup device 5 moves in the circumferential direction of the optical disc, as shown by ΔI in FIG. do. At this time, with the optical diameter block portion 5a of the optical pickup device 5 or the support groove portion 21 as an axis, θ
This is to perform rotational movement as shown in .

Here, the distance from the line connecting the support groove 21 and the guide shaft 7 to the signal recording surface of the optical disc 109 is l.
, and the distance from the support groove 21 to the optical axis of the objective lens 6 is 1. Let the distance from the optical axis of the objective lens 6 to the guide axis 7 be l. Further, if α is the angle between the line from the support groove 21 to the guide shaft 7 and the line from the support groove 21 to the intersection of the optical axis of the objective lens 6 and the signal recording surface, then ΔT =
(I!+ + 12)"2(Cosα-Cos(α〇)), and ΔH-(12+122) Tanθ, so ΔT= (z, +z2)""-(Cosα-Cos <a 10Tan-' (ΔH/(
I! 2+i z)))), and the moving amount ΔI of the beam spot can be expressed as the moving amount ΔH of the guide shaft 7.

The second cam body 14 moves the optical pickup device support plate 15 with respect to the chassis l in order to prevent the beam spot from moving in the circumferential direction on the optical disk as described above. . That is, when the guide shaft 7 is rotated and the guide shaft 7 is moved as shown by the arrow in FIG. 5, the second cam body 14 moves along with the guide shaft 7. , and moves in the direction toward and away from the chassis 1 while remaining in contact with the side portion of the second abutting portion 20 . Then, the optical pickup device support plate 15 is moved relative to the chassis 1 by a distance corresponding to the amount of movement ΔI of the beam spot, as shown by arrow I in FIG.

As described above, in this optical disk recording and/or reproducing apparatus, the optical pickup device support of the optical pickup device 5 can be adjusted without moving the beam spot formed on the optical disk 109 by the optical pickup device 5. The inclination with respect to the plate 15 is determined by the light beam emitted by the optical pickup device 5 or the optical disc 1.
Adjustment can be made so that the irradiation is perpendicular to 09.

In addition, in the guide device for the optical pickup device according to the present invention, after the adjustment of the movement locus and inclination of the optical pickup device 5 is completed, the guide device between the abutment portion 8a and the cam body 9 or the optical The pickup device support plate 15 and each of the first cam bodies 9 and 13 may be bonded and fixed between the second abutment portion 20 and the second cam body 14. .

H Effects of the Invention As described above, in the guide device for an optical pickup device according to the present invention, the guide shaft that slidably supports the optical pickup device is disposed on the chassis. It is positioned by the holding part and the mounting part, and has a cam part eccentric to the axis of the guide shaft, which is attached to the guide shaft and comes into contact with the abutment part protruding from the chassis. By rotating the cam body around the axis of the guide shaft, the cam body is moved on the shear, so that the locus of movement of the optical pickup device can be changed.

Therefore, in a device having an optical pickup device such as an optical disk recording and/or reproducing device configured using the guide device of this optical pickup device, by rotating the cam body, the The movement locus of the optical pickup device can be adjusted to an optimal position. Adjusting the tilt of the optical pickup device does not require disassembling the optical disc recording and/or reproducing device or replacing parts, and can be done by easy operation. assembly work is facilitated.

Further, in the guide device for an optical pickup device according to the present invention, the guide shaft that slidably supports the optical pickup device is disposed on the optical pickup device support plate that is movable with respect to the shear. The guide shaft is positioned by being brought into contact with the first abutment parts protruding in a pair on the pickup device support plate, and has a cam part eccentric with respect to the axis of the guide shaft. The distance from the optical pickup device support plate is increased by rotating the first cam body, which is attached in pairs to the optical pickup device support plate and comes into contact with the optical pickup device support plate, around the axis of the guide shaft. a second cam having a cam portion eccentric to the fine center of the guide shaft, which is attached to the guide shaft and comes into contact with a second abutment portion protruding from the chassis; When the body is rotated about the axis of the guide shaft, it is moved along the chassis together with the optical pickup device support plate. Changes in the movement locus of the beam spot formed by the optical pickup device are prevented.

Therefore, in a device having an optical pickup device such as an optical disk recording and/or reproducing device configured using the guide device of this optical pickup device, by rotating each of the cam bodies, The inclination of the optical pickup device can be adjusted while maintaining the movement locus of the beam spot formed by the optical pickup device at an optimal position.

That is, the present invention can facilitate the manufacture and assembly of a device including an optical pickup device, such as an optical disk recording and/or reproducing device, and can easily operate the device formed by the optical pickup device. It is an object of the present invention to provide a guide device for an optical pickup device that allows a beam spot to move on a straight line including the center of an optical disk.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration of essential parts of an optical disk recording and/or reproducing apparatus constructed using a guide device for an optical pickup device according to the present invention, and FIG. FIG. 3 is an enlarged side view showing the configuration of the main parts of the device, and FIG. 3 is a plan view showing a state in which the movement of the guide shaft is adjusted in the guide device of the optical pickup device. FIG. 4 is a perspective view showing another example of the configuration of essential parts of an optical disk recording and/or reproducing apparatus constructed using the guide device of the optical pickup device according to the present invention, and FIG. 6 is an enlarged side view showing the configuration of the main part of the guide device of the optical pickup device shown in FIG. 4, and FIG.
FIG. 2 is a plan view showing the configuration of a guide device of the optical pickup device shown in the figure. FIG. 7 is a schematic diagram showing the relationship between the tilt of the optical pickup device and the movement of the beam spot in the guide device of the optical pickup device shown in FIG. 4 above. FIG. 8 is a perspective view showing the configuration of main parts of a conventional optical disc recording and/or reproducing apparatus. FIG. 9 is a schematic diagram showing a state in which the movement locus of the beam spot on the optical disk is in a good position;
The figure is a schematic % formula showing a state in which the movement locus of the beam spot on the optical disk is not good.]3......First cam body 14...
...Second cam body 15...Optical pickup device support plate 20...Second
Abutting section patent application Sony Corporation

Claims (1)

[Scope of Claims] A chassis, a guide shaft holding section disposed on the chassis, an abutting member protruding on the chassis, and a mounting section disposed near the abutting section. , a guide shaft that is disposed on the chassis, has one end held by the guide shaft holding part, and is positioned with the other end in contact with the mounting part, and slidably supports the optical pickup device. and a cam body having a cam portion eccentric to the axis of the guide shaft and attached to the other end side of the guide shaft and abutting the abutting portion; and a mounting member that elastically presses the cam body against the abutting portion, and the cam body is rotatably operated around the axis of the guide shaft. A guide device for an optical pickup device, wherein the guide shaft is moved on the chassis in a direction perpendicular to the axial direction. (2) a chassis, an optical pickup device support plate movably supported with respect to the chassis, a biasing means for elastically biasing the optical pickup device support plate in one direction with respect to the chassis, and the optical pickup device a first abutment part disposed in a pair on the device support plate; a second abutment part protrudingly provided on the chassis; and a second abutment part disposed on the optical pickup device support plate, both ends a guide shaft that is positioned with its side in contact with each of the first abutment portions and slidably supports the optical pickup device; and a cam portion that is eccentric with respect to the axis of the guide shaft. a first cam body that is attached to both ends of the guide shaft in a pair and comes into contact with the optical pickup device support plate; and a cam portion that is eccentric with respect to the axis of the guide shaft. a second cam body attached to the guide shaft and pressed against the other side of the second abutting portion by the urging force of the urging means; and a mounting member that elastically presses the first cam body against the optical pickup device support plate, and the first cam body rotates around the axis of the guide shaft. The second cam body is rotated around the axis of the guide shaft by being rotated to move the guide shaft on the optical pickup device support plate in a direction perpendicular to the axial direction. A guide device for an optical pickup device, which is configured to move the optical pickup device support plate on the chassis by a moving operation.