JPH0471252B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an optical disk player, and particularly to an optical head angle adjustment mechanism for finely adjusting the angle of the optical head.

[Background of the invention]

The conventional device, as described in Utility Model Application No. 58-109836, uses one plane as a fulcrum, a first adjustment screw, a second
The disc was supported by three adjustment screws, and by changing the height of each adjustment screw, the angle of rotation around the axis in the tangential and radial directions of the disk was adjusted. However, since the tip of each adjustment screw and the flat surface are in surface contact, there is a problem in that angle changes around the two axes influence each other as the angle is adjusted.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a small and lightweight optical head angle adjustment mechanism that can independently adjust angles around two axes.

[Summary of the invention]

In order to achieve the above object, in the present invention, rotational axes whose central axes are parallel to the radial direction of the disk and intersect with the optical axis are provided on both sides of the mounting plate of the optical head, and one rotational axis is attached to the disk. It is supported by a bearing that can rotate with the central axis in the tangential direction, and the other rotation axis is supported by the first adjustment screw, making its height variable and the angle of the rotation axis adjustable. shall be. Further, the second adjustment screw rotates the mounting plate around the rotation axis, and the angle adjustment around the remaining axis can be performed without affecting the initial angle adjustment.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on the drawings. FIG. 1 is a plan view showing a schematic configuration of an optical disk player to which an optical head angle adjustment mechanism according to the present invention is applied, and FIG. 2 is a plan view of the same angle adjustment mechanism.
Figure 3 is a sectional view taken along line A-A in Figure 2, and Figure 4 is a cross-sectional view of Figure 2.
A sectional view taken along line BB in the figure is shown.

In the above drawings, 1 is a disk, 2 is a disk motor that rotates the disk 1 at high speed, and 3 is a guide shaft. The disk motor 2 and guide shaft 3 are fixed to a base (not shown). Reference numeral 4 denotes a transfer table, which is supported by a guide shaft 3 and can be horizontally moved in the radial direction of the disk 1.
A mounting plate 5 is attached to the transfer table 4.
An optical head 6 is fixed to.

On both sides of the mounting plate 5 for fixing the optical head 6, there is a first rotation shaft 7 whose center axis is a line parallel to the radial direction of the disk 1 and passing through the optical axis (x-axis in the figure).
and a second rotation shaft 8, which are attached to the transfer table 4 via a first bearing 9 and a second bearing 10. Here, as shown in FIG. 3, the first bearing 9 is attached to the transfer table 4 in a freely rotatable state about a line parallel to the tangential direction of the disk 1 (the y-axis in the figure) as a central axis. The rotation shaft is rotatably supported. Further, the second bearing 10 is a vertical elongated hole, prevents the second rotation shaft 8 from moving in the horizontal direction, supports the second rotation shaft 8 rotatably, and is fixed to the transfer table 4. Inside the second bearing 10, a first adjustment screw 11 is rotatably screwed under the second rotation shaft 8 and supports the second rotation shaft from below.
Further, a first elastic member 12 made of a spring spring is installed above the second rotation shaft 8 so as to face the first adjustment screw 11 , and the second rotation shaft 8 is connected to the first adjustment screw 11 . It is biased in the direction of contact.
Further, a first fixing screw 13 is rotatably screwed into the second bearing 10 so as to face the first adjusting screw 11, and after the adjustment is completed, the second rotating shaft 8 is connected to the first adjusting screw 11. Fix it in contact with the

As shown in FIG. 2, the first bearing 9 of the mounting plate 5
An arm portion 14 is horizontally protruded from the side surface, and a second adjustment screw 15 is rotatably screwed onto the y-axis.
As shown in the figure, the tip of the second adjustment screw 15 is brought into contact with the transfer table 4 at the same height as the y-axis. In addition, the second elastic member 16 made of a spring spring is attached to the collar 1.
7 and the arm part 14, and the arm part 14
is biased in the direction in which the adjustment screw 15 and the transfer table 4 come into contact with each other. The fixing screw 18 passes through the inside of the collar 17 and is rotatably screwed into the transfer table 4. When tightened, the arm part 14 is rotated through the collar 17 with the adjustment screw 15 and the transfer table 4 in contact with each other. Set.

To adjust the angle of the optical head using the optical head angle adjustment mechanism according to the present invention, first loosen the first fixing screw 13 and the second fixing screw 18, and then rotate the first adjusting screw 11 to adjust the angle of the optical head. The rotation angles of the rotating shaft 7 and the second rotating shaft 8 about the y-axis are adjusted, and the angles are fixed by the first fixing screw 13. Next, the mounting plate 5 is rotated by turning the second adjustment screw 15 to adjust the angle around the x-axis, and the angle is fixed by the second fixing screw 18. Here, the mounting plate 5 rotates smoothly around the first rotation axis 7 and the second rotation axis 8, and by adjusting the angle around the x-axis, it returns to the first adjusted angle around the y-axis. There will be no impact. In this way, the laser beam irradiated from the optical head 6 can be applied perpendicularly to the disk 1.

〔Effect of the invention〕

As described above, according to the present invention, a rotation shaft is provided on the mounting plate of the optical head, and one end of the rotation shaft is supported by a bearing that is rotatable about the tangential direction of the disk as the central axis.
In addition, the angle of the rotation axis is adjusted by supporting the other end with an adjustment screw and changing the height, and then adjusting the angle of the mounting plate around the rotation axis with an adjustment screw that supports the mounting plate at another point. By doing this, you can easily fine-tune the angle around each axis.
Moreover, it can be adjusted completely independently, unlike the conventional mechanism that adjusts two axes within one plane.
When adjusting an axis, there is no problem of affecting the adjustment angle of other axes, and each axis can be adjusted independently.
It is possible to provide an optical disk player having a compact and high-performance optical head angle adjustment mechanism, which can solve the problem of increasing the size of the mechanism in the case of a device with a rotating shaft.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a schematic configuration of an optical disc player to which an angle adjustment mechanism according to the present invention is applied.
Figure 2 is a plan view of the same angle adjustment mechanism, and Figure 3 is a plan view of the angle adjustment mechanism.
4 shows a sectional view taken along line AA in the figure, and FIG. 4 shows a sectional view taken along line BB in FIG. DESCRIPTION OF SYMBOLS 1...Disk, 2...Disk motor, 3...Guide shaft, 4...Transfer table, 5...Mounting plate, 6...Optical head, 7...First rotation axis, 8...Second rotation axis,
9...first bearing, 10...second bearing, 11...first
adjustment screw, 12...first elastic member, 13...first
fixing screw, 14... arm portion, 15... second adjustment screw, 16... second elastic member, 17... collar, 1
8...Second fixing screw.

Claims (1)

[Claims] 1. An optical disk player comprising a mounting plate 5 for fixing an optical head 6, and a transfer table 4 on which the mounting plate 5 is mounted and movable horizontally in the radial direction of the disk 1. First and second disks having central axes that intersect and are parallel to the radial direction of the disk and are fixed separately to both sides of the mounting plate 5.
and a first bearing 9 that supports the first rotation shaft 7 and is rotatably attached to the transfer table about an axis parallel to the tangential direction of the disk.
and the second rotating shaft 8 held by the transfer table 4.
a second bearing 10 that supports the second rotating shaft 8 in a vertically movable state; a first elastic member 12 that biases the second rotation shaft 8 in either the vertical direction; and a biasing force provided by the elastic member. a first adjustment screw 11 that supports the second rotation shaft 8 in a direction opposite to the direction; and a first fixing screw that brings the second rotation shaft 8 into contact with the first adjustment screw 11. 13, and the mounting plate 5 is attached to the first
and a second elastic member 16 that biases in a constant rotational direction around the second rotational shafts 7 and 8;
and the second elastic member 16 is located on a straight line that is perpendicular to the first and second rotation axes and passes through the first bearing 9 on a horizontal plane including the second rotation axes 7 and 8. a second adjustment screw 15 that supports the mounting plate in a direction opposite to the direction in which it is biased; and a second fixing screw 18 that brings the mounting plate 5 into contact with the second adjustment screw 15; The fixing screws 13, 15
An optical head angle adjusting mechanism characterized in that the angle of the optical head is adjusted by loosening the screws and adjusting the adjusting screws 11 and 13.