JPS6245296Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is a digital audio disk (DAD).
It relates to an angle adjustment device for an optical pickup used in disk recording and reproducing devices such as
The present invention relates to an angle adjustment device for an optical pickup that allows fine adjustment in the axial and Y-axis directions.

As conventional disk recording and reproducing devices, there are known disks such as magneto-optical disks or DADs that can perform recording and reproducing, and disks that are exclusively used for reproducing. In order to align the optical axes of the light emitted from the objective lens of the optical pick-up and the light reflected from the disk, the optical pick-up 1 is aligned with the radial direction X-X' axis of the disk relative to the disk D, as shown in FIG. Centering on the surface direction Z-Z' axis of disk D, the disk track tangent direction (tangential direction) Y-Y' axis, and further centering on the Y-Y' axis and Z-Z' axis in the X-X' axis direction. It was necessary to adjust the rotation angle.

For example, if the tilt adjustment in the Y-Y' direction is not appropriate, the detection power of the optical pickup will be changed between the rising angle θ ₁ and the falling angle θ 1 of the high-frequency signal waveform, as shown in Figure 2.
₂ is different, which adversely affects the reproduced signal.

Furthermore, if the tilt adjustment in the X-X' direction is not appropriate, a DC drift of the tracking error signal will occur as shown in FIG. 3, and correct tracking will not be performed. In order to eliminate the above-mentioned problems in conventional pickups, optical components are precisely arranged so that the light emitted from the objective lens is parallel to the mounting reference surfaces A and B of the optical pickup 1. As a result, the mounting accuracy of the optical components during pick-up is very strict, and the adjustment of the optical path also takes a long time.

This invention was created in view of the above drawbacks,
In the present invention, the optical pick-up can be easily adjusted by adjusting the optical path and assembling the optical pick-up support mechanism by making fine adjustments in the X-X' direction using the optical pick-up mounting adjustment mechanism without severely restricting the mounting accuracy of the optical pick-up mounting reference surface. The object of the present invention is to provide an angle adjustment device.

According to the present invention, the above-mentioned object is to provide a disk recording/reproducing apparatus which records or reproduces digital information by condensing objective lens light from an optical pickup onto a disk, in which the disk plane and the objective lens surface of the optical pickup are recorded or reproduced. a first mounting block that supports the optical pickup so that the opposing angle between the optical pick-up and the optical pick-up can be varied in the radial and tangential directions on the disk surface; a second mounting block that is pivotally supported;
The second rotation axis is supported by a rotation axis approximately 90° with respect to the first rotation axis.
a third mounting block that pivotally supports the second mounting block on a rotation shaft; a first angle adjustment means that finely adjusts the angle between the first and second mounting blocks; 2. a second angle adjustment means for finely adjusting the angle between the third mounting block; a first fixing means for fixing the first and second mounting blocks in a finely adjusted state; and a second fixing means for fixing the third mounting block in a finely adjusted state, thereby accomplishing assembly and fine adjustment between the first, second, and third blocks of the optical pickup support mechanism. It is constructed so that it can be assembled and fixed.

Hereinafter, the configuration of the present invention will be described in detail with reference to the drawings.
Reference numeral 1 denotes an optical pickup, and mounting screw holes 3a, 3 formed in the convex portion formed in the first mounting block 2 are inserted into tap holes 1a, 1b provided in the housing of the optical pickup.
The optical pickup 1 is fixed to the first mounting block 2 by fixing it with a screw 3c through the screw 3b. The first mounting block 2 is attached to the second mounting block 7 by means of a rotation fulcrum shaft 4 and a fixing screw hole 5 which protrude in a direction perpendicular to the mounting screw holes 3a and 3b. Note that 6 in the first mounting block 2 is an adjustment screw hole. Further, the pivot shaft 4 is located on the Y-Y' axis in FIG. 1, and in order to enable the objective lens to rotate in the X-X' direction about the pivot shaft 4,
At the first rotation axis, the rotation fulcrum shaft 4 and the hole 8a of the second mounting block 7 are fitted together, and the screw hole 5 of the first mounting block 2 is inserted with a screw (not shown) through the hole 8b.
At the time of setting, it is fixed by the first fixing means.

The second mounting block 7 has a rotation fulcrum shaft 9 in the direction (X-X axis) perpendicular to the hole 8b, and a tapped hole 9a is formed in the rotation fulcrum shaft 9. A screw (not shown) is passed through the hole 10a formed in the protrusion, and the third mounting block 10 is attached to the second mounting block 7 by screwing it into the tap hole 9a.
The optical pickup 1 is fixed to a moving means (not shown) through a locking hole 19 that allows the optical pickup 1 to be rotated in the Y-Y' direction by a second rotation axis about the rotation fulcrum axis 9 on the X' line. .

The holes 12 and 13 of the second mounting block 7 are fixed to the threaded holes 18 of the third mounting block 10 and the threaded holes 6 of the first mounting block 2 with screws 16 and 17 via compression springs 14 and 15. The angle is adjusted in the Y-Y' direction (the tangential direction of the track) by rotating the screw 16 as the first angle adjusting means, and in the X-X' direction (the tangential direction of the track) by rotating the screw 17 as the second angle adjusting means. The angle can be adjusted in the radial direction of the disk.

Note that the tap hole 9 formed in the second mounting block 7
The rotation fulcrum shaft 1 is attached to the third mounting block 10 with respect to b.
Hole 1 formed in an oval shape on a radius centered on 0a
Adjustment in the Y-Y' direction is performed using the screw 17, which is inserted through the screw 1, and then setting is performed using the second fixing means.

Further, when adjusting the screws 16, the screws (not shown) inserted through the holes 8b and 5 are loosened, and after fine adjustment using the screws 16, the screws of the first fixing means inserted through the holes 8b and 5 are used for setting.

Since the present invention is constructed as described above, the first to third mounting blocks allow the objective lens to be
The angle in the Y-Y' direction can be easily adjusted using the screws 16 and 17, and each mounting block can be fixed by the fixing means, so that the mounting can be reliably maintained in the adjusted state, which has a great practical effect.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the relationship between a conventional optical pickup device and a disk, Fig. 2 is a detection output waveform diagram of the optical pick-up when the tilt in the Y-Y' direction is not appropriate, and Fig. 3 is a diagram of the detection output waveform of the optical pick-up in the case where the inclination in the Y-Y' direction is not appropriate. FIG. 4 is an exploded perspective view of the optical pickup angle adjusting device of the present invention. 1... Optical pickup, D... Disk, 2...
...first mounting block, 4,9...rotation fulcrum shaft,
5...Fixing screw hole, 6...Adjustment screw hole, 7...
Second mounting block, 8b, 11... hole, 16,
17...Screw, 10...Third mounting block.

Claims (1)

[Scope of utility model registration request] A first attachment for supporting an optical pickup in an angle adjustment device for an optical pickup that finely adjusts the opposing angle between the objective lens of the optical pickup and the disk surface in approximately 90° directions in the x-axis and y-axis directions. a second mounting block that pivots and pivots the first mounting block on a first pivot shaft; a third mounting block that pivotally supports the second mounting block on a rotation shaft; a first angle adjustment means that finely adjusts the angle between the first and second mounting blocks; 2. a second angle adjusting means for finely adjusting the angle between the third mounting block; a first fixing means for fixing the first and second mounting blocks in a finely adjusted state; and a second fixing means for fixing the third mounting block in a finely adjusted state. An angle adjustment device for an optical pickup, characterized in that it is assembled.