JPH0538408Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an optical pickup device used in disk players (including CD and LD players).

[Technical background of the invention]

Figure 5 is a plan view of a conventional optical pickup.
FIG. 6 is a front view, and FIG. 7 is a left side view of FIG. 5. In these figures 5 to 7, 1 is a pick-up. 6 is a disk, and two reference shafts 3 are attached to a frame (not shown) parallel to the information recording surface of the disk 6.

The movable table 2 is supported by the two reference shafts 3 by bearings 7 and 8 so as to move parallel to the disk 6 along the two reference shafts 3. This moving platform 2
A pick-up 1 is supported by pins 4 and 5. Pins 4 and 5 are located on the same axis along line A-A. The pick-up 1 is abutted against one surface of the movable table 2 by a screw and a wave washer 9.

Note that the frame is equipped with a spindle motor that rotates the disk 6 and a drive mechanism for the movable table 2. Moreover, 10 shown in FIG. 7 is an eccentric driver hole for adjustment.

Next, the operation will be explained. The movable table 2 is supported by two reference shafts 3 and moves parallel to the disk 6. The pick-up 1 is rotatably supported by the movable base 2 around pins 4 and 5, and the movable base 2 is supported by an eccentric driver hole 10 for adjustment (another adjustment mechanism is also possible).
It can be adjusted to any angle and fixed with screws.

[Problems with background technology]

By the way, in the optical pickup device, the pickup 1 must be moved from the innermost circumference to the outermost circumference of the disk 6 so that the distance between the pickup 1 and the information recording surface of the disk 6 does not change. The emitted light must be irradiated onto the information surface of the disk 6 at a predetermined angle.

However, since the light emitted from the pick-up 1 has some variation with respect to the reference plane of the pick-up 1, in order to read the information without error, it is necessary to
It is desirable to adjust the angle of information to the information surface.

Further, since the movable table 2 supporting the pickup 1 needs to have high precision and sufficient strength, it is difficult to miniaturize the optical player and it becomes expensive.

[Purpose of invention]

This invention was made in order to eliminate the above-mentioned conventional drawbacks, and the object is to provide an optical pickup device that is small and inexpensive and suitable for mass production.

[Summary of the idea]

The optical pickup device of this invention has first and second reference axes arranged parallel to the disk, a bearing assembly supported so as to be movable along the first reference axis, and a bearing assembly that is movable along the first reference axis. One end of the pick-up is attached to a bearing assembly so as to be adjustable at any angle, and the other end of the pick-up is provided with means for sliding or rolling along a second reference axis, and the means is provided with means for sliding or rolling along a second reference axis. A biasing means is used to bias the battery so that it does not occur.

[Example of idea]

Embodiments of the optical pickup device of this invention will be described below with reference to the drawings. 1 is a plan view of one embodiment, FIG. 2 is a front view thereof, FIG. 3 is a right side view of FIG. 1, and FIG. 4 is a left side view of FIG. 1.

In FIGS. 1 to 4, reference numeral 11 denotes a pickup, and a virtual axis A--A is in a plane perpendicular to the output optical axis 11a of the pickup 11. In FIG.

Also, at one end (right end) of the pick-up 11,
A wheel 12 that rotates around a virtual line A-A is provided. At the other end of this pick-up 11, a pin 13 centered on the virtual axis A-A is attached to the other end of the pick-up 11.
It is provided in the plan view section perpendicular to .

A bearing assembly 16 is positioned on the flat surface of the pick-up 11 by this pin 13, and tightly fixed by a screw and a wave washer 20.
This bearing assembly 16 forms a movable part together with the pick-up 11, and has a bearing 14. The bearing 14 has a pin hole in a plane parallel to the central axis into which the pin 13 fits.

Further, reference axes 18 and 19 are a pair of reference axes, which are parallel to each other in a plane with a predetermined interval (different heights), and are parallel to the information recording surface of the disk 17. Of these, the reference shaft 18 determines the position of the bearing assembly 16 (the direction of the pick-up output optical axis 11a and the direction of the virtual axis A-A), and is supported by the bearing 14.

On the other hand, the reference shaft 19 also supports the wheel 12 on a plane (line) parallel to the disk 17 so that the virtual axis A-A is parallel to the disk 17. This rolling wheel 12 is urged by a biasing spring 21 so as not to separate from the reference shaft 19.

In addition, in the screw and wave washer 20,
If the tightening of the screws is selected appropriately, the pick-up 11 can be rotated freely around the virtual axis A-A, so by adjusting it with an eccentric screwdriver and tightening the screw strongly, it can be rotated at any angle with respect to the disk 17. A pick-up 11 can be attached.

Next, the operation of the optical pickup device of this invention constructed as described above will be explained. A movable part consisting of a bearing assembly 16, a pick-up 11, etc. is supported by reference shafts 18 and 19, and moves in parallel to the disk 17 along the reference shafts 18 and 19 in the direction of arrow A1.

Also, the pick-up 11 has a pin 13 and a wheel 12.
Since it is rotatable about the rotation axis (virtual axis A-A), it can be adjusted to any angle with respect to the disk 17 using an eccentric driver or the like, and fixed with screws and wave washers 20.

Note that the rolling wheels 12 may be pins as long as the contact points with the reference shaft 19 have good sliding.Furthermore, although the reference shaft 19 is a cylindrical shaft in the illustrated embodiment, it may roll on a plane parallel to the disk 17. The ring 12 may also be supported.

[Effect of idea]

As described above, according to the optical pickup device of this invention, the first and second reference axes are disposed parallel to the disk, and the bearing assembly is movable along the first reference axis. support,
One end of the pick-up is attached to a bearing assembly so as to be adjustable at any angle with respect to the disk, and means for sliding or rolling along a second reference axis is provided at the other end of the pick-up, and this means
Since the biasing means is used to bias the carriage so that it does not move away from the reference axis, the pick-up can function as a conventional moving platform, reducing the number of large parts that require high precision, resulting in a compact carriage. be able to.

In addition, the means for rolling or sliding on the second reference shaft may be a standard product, which is inexpensive considering its accuracy and is suitable for mass production.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the optical pickup device of this invention, FIG. 2 is a front view of the same optical pickup device, and FIG. 3 is a right side view of FIG. 1.
4 is a left side view of FIG. 1, FIG. 5 is a plan view of a conventional optical pickup device, FIG. 6 is a front view of a conventional optical pickup device, and FIG. 7 is a left side view of FIG. 5. It is a diagram. 11...Pickup, 11a...Pickup output optical axis, 12...Rolling wheel, 13...Pin, 14
... Bearing, 16 ... Bearing assembly, 17 ...
Disk, 18, 19... Reference shaft, 20... Screw and wave washer, 21... Biasing spring.

Claims (1)

[Claims for Utility Model Registration] First and second reference axes extending along the radial direction of the disk, a bearing assembly held movably along the first reference axis, and the bearing assembly at one end. a pick-up having a single engagement pin rotatably engaged with the assembly, and a contact portion at the other end that rolls or slides along the second reference axis; The rotation axis of the pickup defined by the contact portion is arranged to be orthogonal to the first and second reference axes, and the first and second reference axes are arranged so that the rotation axis is parallel to the disk recording surface. An optical pickup device comprising: two reference axes arranged at different distances from the disk, and urging means for urging the contact portion toward the second reference axis.