JP2002222571A - Height direction angle regulating mechanism of guide shaft for optical pickup - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a height direction angle regulating mechanism of a guide shaft for an optical pickup which is capable of regulating the height direction posture of the guide shaft with high accuracy. SOLUTION: This mechanism has a first bolt 61 which is screwed to a base 10 from a second plate surface 10b side and a torsional spring 62 which presses the peripheral surface of the end of the guide shaft 42 in the direction where the guide shaft 42 parts from the second plate surface 10b. The mechanism is so constituted that the angle position in the height direction of the guide shaft 42 can be regulated by rotating the first bolt 61. The mechanism further has a second bolt 71 which has a screw head to be screwed to the base 10 from the section plate surface 10b side and a tension spring 72 which is mounted on a second sheet metal 73 on the base 10 and pulls the peripheral surface of the end of the guide shaft 41 in the direction where the guide shaft 41 parts from the second plate surface 10b. The mechanism is so constituted that the angle position in the height direction of the guide shaft 41 can be regulated by rotating the second bolt 71.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a height adjusting mechanism for a guide shaft for an optical pickup used in an optical disk drive.

[0002]

2. Description of the Related Art In order to respond to recent demands for increasing the capacity of optical disks and increasing the speed of access to optical disks, optical disk drives are required to have a highly accurate mechanism. One method for satisfying such demands is to improve the dimensional accuracy of the component. However, it is practically difficult to further improve the manufacturing accuracy of the component as compared with the current situation. Therefore, in this method, only the parts that conform to the higher precision standards are selected from the parts manufactured with the current manufacturing precision, and as a result, the proportion of non-standard products in the part manufacturing is increased. This leads to an increase in cost.

Therefore, as a method of realizing a high-precision mechanism without improving the dimensional accuracy of a component, a method has been proposed in which the mounting position of the component can be adjusted so as to allow a certain degree of dimensional variation. I have.

One of the mounting positions of components to be adjusted in an optical disk drive is a height orientation of an optical pickup guide shaft used in the optical disk drive. If the height orientation is not adjusted to an appropriate value, the light of the laser beam emitted from the optical pickup is directed to the read / write surface of the optical disk or the disk table surface for mounting and rotating the optical disk. The axis may be tilted (called skew) or out of focus. Therefore, a height direction angle adjustment mechanism of the guide shaft for an optical pickup as shown in FIGS. 5 and 6 and FIGS. 7 and 8 has been proposed and put into practical use.

Referring to FIGS. 5 and 6, the height-direction angle adjusting mechanism of the optical pickup guide shaft is used to guide the optical pickup 630 to move along a predetermined direction.
And 642 are held and fixed so that the angular position in the height direction (the thickness direction of the base 610) can be adjusted with respect to the upper surface of the plate-shaped metal base 610 having the first and second plate surfaces (upper and lower surfaces). Is what you do. Height direction angle adjustment mechanism 660
Is a resin cam member 661 rotatably mounted (outsert molding) on the upper surface of the base 610, a holder 663 mounted on the base 610 and holding the guide shaft 641 or 642, and mounted on the base 610. The guide shaft 641 or 642 moves the peripheral surface at the end of the guide shaft 641 or 642 arranged substantially parallel to the upper surface of the base 610 to the base 610.
Spring 66 which presses and biases in the direction approaching the upper surface of
And 2. Then, by rotating the cam member 661, the guide shaft 641 or 64 inserted into the spiral groove formed on the peripheral surface of the cam member 661.
The two ends move upward or downward. That is, the angular position of the guide shaft 641 or 642 in the height direction is adjusted.

Referring to FIGS. 7 and 8, a height direction angle adjusting mechanism of the guide shaft for an optical pickup includes a guide shaft 741 for an optical pickup guide for guiding the optical pickup 730 to move in a predetermined direction.
And 742 are held and fixed so that the angular position in the height direction (the thickness direction of the base 710) can be adjusted with respect to the upper surface of the plate-shaped metal base 710 having the first and second plate surfaces (upper and lower surfaces). Is what you do. Height direction angle adjustment mechanism 760
Is a first bolt 761 having a screw head screwed into a screw hole formed in the base 710, and a bent portion 7 attached to the base 710 and holding the guide shaft 741.
63 and a guide shaft 741 attached to the base 710 and arranged substantially parallel to the upper surface of the base 710
The guide shaft 741 is attached to the base
Compression spring 7 that presses and urges in the direction away from the upper surface of
62. The screw head of the first bolt 761 and the compression spring 762 cooperate to hold the guide shaft 741. By rotating the first bolt 761, the angular position of the guide shaft 741 in the height direction is adjusted. Also, a height direction angle adjustment mechanism 770
Is a second bolt 771 having a screw head that is screwed into a screw hole formed in the base 710, and a bent portion 7 attached to the base 710 and holding the guide shaft 742.
73 and a guide shaft 742 attached to the base 710 and arranged substantially parallel to the upper surface of the base 710.
The guide shaft 742 is attached to the base
Compression spring 7 that presses and urges in the direction away from the upper surface of
72. The screw head of the second bolt 771 and the compression spring 772 cooperate to hold the guide shaft 742. By rotating the second bolt 771, the angular position of the guide shaft 742 in the height direction is adjusted.

[0007]

The conventional height direction angle adjusting mechanism shown in FIGS. 5 and 6 has a large number of parts. In addition, a metal part (base 610) and a resin part (cam member 661) are provided. Further, it is relatively difficult for the cam member 661 made of resin to accurately injection-mold the groove dimension. Also, since the components are present on the upper surface of the base 610, they occupy a relatively large amount of space on the upper surface of the base 610. This is disadvantageous for thinning the optical disk device.

The conventional height angle adjusting mechanism shown in FIGS. 7 and 8 occupies a relatively large amount of space on the upper surface of the base 710 because the components are present on the upper surface of the base 710. . This is disadvantageous for thinning the optical disk device. In the direction orthogonal to the load direction of the compression spring 772, play is likely to occur in the guide shaft 742.

Accordingly, an object of the present invention is to provide a simple configuration,
The space occupied on the base is as small as possible, which is advantageous for making the optical disk device thinner, and the height direction angle adjustment mechanism of the guide shaft for the optical pickup that can adjust the height direction of the guide shaft with high accuracy. To provide.

[0010]

According to the present invention, a guide shaft (4) for guiding an optical pickup for guiding an optical pickup (30) to move along a predetermined direction is provided.
1, 42) with the first and second plate surfaces (10a and 1).
0b) The height direction of the guide shaft for an optical pickup for holding and fixing the angle position in the height direction of the plate-shaped metal base (10) having the height with respect to the second plate surface (10b). In the angle adjusting mechanism, the first screw hole formed in the base (10) or a first sheet metal attached to the base (10) so as to extend in the thickness direction of the base (10) is inserted into the first screw hole. A first bolt (61) screwed from the second plate surface (10b) side; and a first bolt (61) mounted on the first plate surface (10a) of the base (10), and the second plate surface (10b). Torsion that presses and urges the peripheral surface of at least one end of the guide shaft (42) arranged substantially in parallel with respect to the direction in which the guide shaft (42) moves away from the second plate surface (10b). A spring (62),
The tip surface of the first bolt (61) and the torsion spring (62) cooperate to form the guide shaft (41).
, And by rotating the first bolt (61), the angular position of the guide shaft (42) in the height direction can be adjusted, and further, the thickness direction of the base (10) can be adjusted. The base (10) so as to extend to
In the second screw hole formed in the second plate surface (10
b) A second bolt (7
1) and the second plate surface (10) of the base (10).
b) the guide mounted on or on a second sheet metal (73) mounted on the second plate surface (10b) and arranged substantially parallel to the second plate surface (10b); A tension spring (72) that urges at least one end of the shaft (41) in a direction in which the guide shaft (41) moves away from the second plate surface (10b);
The screw head of the second bolt (71) and the tension spring (72) cooperate to form the guide shaft (4).
1) is held without play, and the second bolt (7
1), the guide shaft (4) is rotated.
A height direction angle adjusting mechanism for a guide shaft for an optical pickup, characterized in that the angle position in the height direction of 1) can be adjusted.

According to the present invention, the guide shafts (41, 42) include a first guide shaft (41) for guiding a rack (31) integrally formed with the optical pickup (30), and a first guide shaft (41). A second guide shaft (42) parallel to one of the guide shafts (41), and engages with the rack (31) on the first plate surface (10a) of the base (10). A gear (50) is rotatably provided, and the first guide shaft (41) is
The screw head of the second bolt (71) and the tension spring (72) are held and fixed so that the angular position in the height direction with respect to the second plate surface (10b) can be adjusted,
The second guide shaft (42) is connected to the distal end face of the first bolt (61) and the torsion spring (62).
Thereby, a height direction angle adjustment mechanism of the guide shaft for the optical pickup, which is held and fixed so as to be adjustable in the height direction with respect to the second plate surface (10b), is obtained.

Note that the reference numerals in parentheses are provided for easy understanding of the present invention, and are merely examples, and it is a matter of course that the present invention is not limited to these.

[0013]

When the first bolt 61 is rotated, the height position of the tip surface changes. As a result, the guide shaft 42 for guiding the optical pickup, which is in contact with the distal end surface, changes its height position against the elastic force of the torsion spring 62 or according to the elastic force of the torsion spring 62. When the second bolt 71 is rotated, the height position of the screw head changes. As a result, the height of the guide shaft 41 for the optical pickup guide, which is in contact with the screw head, is changed against the elastic force of the extension spring 72 or according to the elastic force of the extension spring 72.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings.

An optical disk device to which the mechanism for adjusting the height direction of the guide shaft for an optical pickup according to the present invention is applied is a drive device for a DVD-player.

With reference to FIGS. 1 to 4, the gist of the present invention, that is, a height-direction angle adjusting mechanism of a guide shaft for an optical pickup according to the present invention will be described.

The height-adjusting mechanism for the optical pickup guide shaft according to the present invention comprises a first and a second optical pickup guide shafts 41 and 42 for guiding the optical pickup 30 to move in a predetermined direction. The plate-shaped metal base 10 having two plate surfaces (upper and lower surfaces) 10a and 10b is held and fixed to the second plate surface 10b so that the angular position in the height direction can be adjusted.
And second mechanisms 60 and 70.

The first mechanism 60 has a second plate surface 10b formed in a first screw hole formed in the base 10 or a first sheet metal attached to the base 10 so as to extend in the thickness direction of the base 10. A first bolt 61 screwed from the side, and a guide shaft 42 mounted on the first plate surface 10a of the base 10 and arranged substantially parallel to the second plate surface 10b.
At least one end of the guide shaft 42
A torsion spring 62 that presses and urges in a direction away from the plate surface 10b, a first metal plate 63 for holding the guide shaft 42 so as not to come off in the radial direction of the guide shaft perpendicular to the plate thickness direction of the base 10, have.

The tip surface of the first bolt 61 and the torsion spring 62 cooperate to hold the guide shaft 41.
That is, by rotating the first bolt 61, the angular position of the guide shaft 42 in the height direction can be adjusted. In other words, when the first bolt 61 is rotated, the height position of the tip surface changes. As a result, the guide shaft 42 for guiding the optical pickup, which is in contact with the distal end surface, is opposed to the elastic force of the torsion spring 62 or the torsion spring 62
The height position is changed according to the elastic force of.

The second mechanism 70 has a screw head which is screwed into a second screw hole formed in the base 10 so as to extend in the thickness direction of the base 10 from the second plate surface 10b side. 2 bolt 71 and a second metal plate 7 mounted on the second plate surface 10b of the base 10 or on the second plate surface 10b.
3, and at least one end of the guide shaft 41, which is attached to the second plate surface 10b and disposed substantially parallel to the second plate surface 10b, is pulled in a direction in which the guide shaft 41 moves away from the second plate surface 10b. And a tension spring 72 for urging.

The screw head of the second bolt 71 and the tension spring 72 cooperate to hold the guide shaft 41. That is, by rotating the second bolt 71,
The angular position of the guide shaft 41 in the height direction can be adjusted. In other words, when the second bolt 71 is rotated, the height position of the screw head changes. As a result, the guide shaft 41 for the optical pickup guide contacting the screw head is
The height position is changed against the elastic force of the extension spring 72 or according to the elastic force of the extension spring 72.

The guide shaft 41 guides the rack 31 formed integrally with the optical pickup 30.
The guide shaft 42 is parallel to the guide shaft 41. On the first plate surface 10a of the base 10, a gear 50 that engages with the rack 31 (a gear that directly engages is not shown) is rotatably provided.

That is, the guide shaft 41 guides the master side of the optical pickup 30 in which the driven rack 31 is located, while the guide shaft 42 guides the slave side of the optical pickup 30. The guide shaft 4 of the first plate surface 10a of the base 10
There are more parts around 1 around the guide shaft 42 than around it.

For this reason, one end (left end in FIG. 1) of the guide shaft 41 is used as a reference end for the first and second mechanisms 6.
Neither 0 nor 70. On the other hand, the other end (the right end in FIG. 1) of the guide shaft 41 is held and fixed by a second mechanism 70 in which no components are arranged on the first plate surface 10a of the base 10. That is, the angular position in the height direction with respect to the second plate surface 10b is held and fixed by the screw head of the second bolt 71 and the tension spring 72 so as to be adjustable.

On the other hand, the guide shaft 42 is held and fixed to the second plate surface 10b by a tip end surface of the first bolt 61 and a torsion spring 62 so that the angular position in the height direction can be adjusted.

In the configuration described above, the guide shaft 42 can be moved up and down in parallel by controlling the amount of rotation of the two first bolts 61. In addition, by appropriately adjusting the second bolt 71 and the two first bolts 61 individually, it is possible to change the inclination of the guide shaft 41 and the guide shaft 42 in the height direction.

This structure has a simple structure with a small number of components and has a small number of components arranged on the upper surface side of the base 10, which is advantageous for reducing the thickness of the optical disk.

Although the embodiment of the present invention has been described above, the present invention is, of course, not limited to the above-described embodiment. For example, in the above-described embodiment, the DVD
-An example in which the present invention is applied to a player drive device has been described, but the present invention is not limited to this.
OM drive device, CD-ROM drive device, CD-
R drive device, CD-RW drive device, DVD-R
Of course, the present invention can be applied to an AM drive device, a DVD-RW drive device, an MO drive device, an MD drive device, or the like.

[0029]

The mechanism for adjusting the angle of the guide shaft for an optical pickup in the height direction according to the present invention has a simple structure, occupies as little space on the base as possible, and is advantageous for reducing the thickness of the optical disk device, and has high accuracy. In addition, the height of the guide shaft can be adjusted.

[Brief description of the drawings]

FIG. 1 is a top view showing a height direction angle adjusting mechanism of an optical pickup guide shaft according to an embodiment of the present invention.

FIG. 2 is a perspective view of the mechanism shown in FIG.

FIG. 3 is a perspective view showing a main part of the mechanism shown in FIG. 1;

FIG. 4 is a perspective view showing another main part of the mechanism shown in FIG. 1;

FIG. 5 is a perspective view showing a conventional height-adjusting mechanism for an optical pickup guide shaft.

FIG. 6 is a perspective view showing a main part of the mechanism shown in FIG. 5;

FIG. 7 is a perspective view showing another conventional height adjustment angle adjusting mechanism of an optical pickup guide shaft.

FIG. 8 is a perspective view showing a main part of the mechanism shown in FIG. 7;

[Explanation of symbols]

10, 610, 710 Base 10a First plate surface 10b Second plate surface 30, 630, 730 Optical pickup 41, 42, 641, 642, 741, 742 Guide shaft 60 First mechanism 61, 761 First bolt 62, 662 Torsion spring 63 First sheet metal 70 Second mechanism 71, 771 Second bolt 73 Second sheet metal 72 Tension spring 660, 760, 770 Height direction angle adjustment mechanism 661 Cam member 663 Holder 762, 772 Compression Spring 763, 773 Bend

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Naoki Tamiya 5-105-1 Tanigawa, Yamagata City Yamagata Mitsumi Co., Ltd. F-term (reference) 5D068 AA02 BB01 CC02 EE05 EE17 GG05 5D117 AA02 JJ12 KK08 KK09 KK22

Claims (2)

[Claims] 1. A guide shaft for guiding an optical pickup for guiding an optical pickup to move along a predetermined direction is provided on a second plate surface of a plate-shaped metal base having first and second plate surfaces. A height direction angle adjusting mechanism of an optical pickup guide shaft for holding and fixing an angular position in a height direction in an adjustable manner with respect to the base, wherein the base or the base is attached to the base so as to extend in a plate thickness direction of the base. A first bolt screwed into a first screw hole formed in the first sheet metal from the second plate surface side, and a second bolt attached to the first plate surface of the base; A torsion spring that presses and biases the peripheral surface of at least one end of the guide shaft arranged substantially parallel to the plate surface in a direction in which the guide shaft moves away from the second plate surface. The first bol And the torsion spring cooperates to hold the guide shaft, and by rotating the first bolt, the angular position of the guide shaft in the height direction can be adjusted. And further screwed into a second screw hole formed in the base so as to extend in the thickness direction of the base from the second plate surface side.
A second bolt having a screw head, mounted on the second plate surface of the base or on a second sheet metal mounted on the second plate surface, with respect to the second plate surface And a tension spring that urges at least one end of the guide shaft disposed substantially in parallel in a direction in which the guide shaft moves away from the second plate surface; The screw head and the tension spring are
A guide shaft for an optical pickup, wherein the guide shaft is held in cooperation with the guide shaft, and the second bolt is rotated to adjust an angular position of the guide shaft in a height direction. Height direction angle adjustment mechanism. A first guide shaft configured to guide a rack integrally formed with the optical pickup; and a second guide shaft parallel to the first guide shaft.
A gear that engages with the rack is rotatably provided on the first plate surface of the base, and the first guide shaft is provided with the second bolt The screw head and the tension spring hold and fix an angular position in the height direction with respect to the second plate surface so as to be adjustable. The second guide shaft includes the tip surface of the first bolt and the second bolt. 2. The height-adjusting mechanism for a guide shaft for an optical pickup according to claim 1, wherein the torsion spring is held and fixed so as to adjust the angular position in the height direction with respect to the second plate surface.