JPS5937772Y2 - Optical system fine adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical system fine adjustment device for finely adjusting the angle of an optical device with respect to an optical axis in a device having an optical system, such as an optical disc player.

In a video disc player, a grating is placed in the laser beam optical path to obtain a beam for tracking servo.

Since the side beam obtained by the grating must be irradiated onto the disk surface at a predetermined angle, it is necessary to adjust the angle of the grating with respect to the optical axis.

Conventionally, this type of angle adjustment has been performed by rotating a grid by moving three adjustment screws arranged at 120 degree intervals.

However, since the direction in which the adjustment screw protrudes is not limited to one direction, there is a drawback that adjustment is difficult.

Another drawback is that the configuration of the adjustment mechanism becomes complicated.

Therefore, an object of the present invention is to provide an optical system fine adjustment device that has a simple configuration and is easy to adjust.

The present invention, which is distantly related to the above object, includes a support having a substantially circular through hole, an outer diameter that creates a minute gap with respect to the through hole, and the support body being inserted into the through hole. , a cylindrical optical device holder having a notched flat surface on its outer periphery; and a cylindrical optical device holder that is screwed onto the support so as to be adjustable from the outside and whose tip end is connected to the flat surface of the optical device holder. a first fine adjustment screw pressing near one end and extending substantially parallel to a straight line including the central axis of the optical device holder and the bisecting point of the flat surface; It is screwed onto the support so that it can be adjusted from the center, and its tip presses the vicinity of the other end of the flat surface of the optical device holder, and the center axis of the optical device holder and the flat surface are connected to each other. This invention relates to an optical system fine adjustment device that is operated from a second fine adjustment screw or a pressing member such as a pressing spring that extends substantially parallel to a straight line that bisects a surface.

According to the present invention, when the first fine adjustment screw is advanced and the second fine adjustment screw or the suppression spring is moved backward, the optical device holder is rotated, for example, counterclockwise, and conversely, the second fine adjustment screw is rotated counterclockwise. If the first fine adjustment screw or pressure spring is advanced and the first fine adjustment screw is moved backward, the optical device holder is rotated, for example, clockwise.

Therefore, the optical device holder can be rotated in any direction by operating the first adjustment screw or the first and second adjustment screws.

Further, in a preferred embodiment, the first and second fine adjustment screws extend in the same direction, so that adjustment can be easily performed.

Further, since it is only necessary to provide one notched flat surface and press the adjustment screw from the same direction on this flat surface, the configuration can be simplified.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A grating adjustment device for an optical system of a video disc player according to an embodiment of the present invention will be described below with reference to the drawings.

This lattice adjustment device includes a support body 2 having a circular through hole 1, an outer diameter that creates a small gap with respect to the through hole 1, and is inserted into the through hole 1, and a flat surface with a notch on the outer periphery. 3
A cylindrical grid holder 4 is provided with a cylindrical grid holder 4, and a cylindrical grid holder 4 is screwed into the screw holes 5 and 6 provided in the support 2, and the tip thereof presses the cutout flat surface 3 of the grid holder 4. 1 and a second fine adjustment screw 7.8.

Then, the first fine adjustment screw 7 presses one end 9 of the flat surface 3, and the central axis 10 of the grating holder 4, that is, the optical axis, and the two ends of the flat surface 3 are pressed.
It extends substantially parallel to a straight line 12 including the equal dividing point 11.

Further, the second fine adjustment screw 8 presses the other end 13 of the flat surface 3 and extends substantially parallel to the straight line 12 and the first fine adjustment screw 7.

Therefore, the first and second fine adjustment screws 7.8 are symmetrical about the straight line 12 and can be adjusted respectively on the upper surface 14 of the support 2.

The cylindrical grid holder 4 is provided with a screw hole 15 and a step 16, and the position of the grid 17 is limited by the step 16, and is prevented from coming off by a set screw ring 18 screwed into the screw hole 15. .

Note that the support body 2 is fixed to an optical system substrate (not shown).

In the grating adjustment device configured as described above, when finely adjusting the angle of the grating 17 with respect to the optical axis, the first and second fine adjustment screws 7.8 are moved back and forth.

If the first fine adjustment screw 7 is moved forward and the second fine adjustment screw 8 is moved backward, the grating 17 will rotate clockwise around the optical axis; Advance screw 8,
When the first fine adjustment screw 7 is moved backward, the grating 17 rotates clockwise around the optical axis, and the angle of the grating 17 is finely adjusted.

As is clear from the above, according to the grid adjustment device of this embodiment, the grid 17 can be adjusted by operating the first and second fine adjustment screws 7.8 provided on the upper surface 14 of the support 2, that is, on a selected surface. Since the angle can be adjusted, adjustment operations become easier.

Further, since the cylindrical grid holder 4 is provided with a notched flat surface 3 and the first and second fine adjustment screws 7.8 are pressed thereon, the structure of the apparatus can be simplified.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment and can be further modified.

For example, the grating 17 may be held by the grating holder 4 without using the setscrew ring 18, and may be fixed with an adhesive or the like.

Further screws similar to the first and second fine adjustment screws 7.8 may also be provided.

Further, the through hole 1 does not need to be a perfect circle, and a flat surface may be provided in a portion corresponding to the flat surface 3 to such an extent that rotation of the holder 4 is not hindered.

It is also applicable to angle adjustment of optical devices other than gratings.

Further, as shown in FIG. 4, instead of the fine adjustment screw 8 shown in FIGS. It may be biased with a spring.

In FIG. 4, parts common to those in FIG. 2 are given the same reference numerals.

In this case, the angle of the grid holder 4 can be adjusted only by moving the first fine adjustment screw 7 back and forth.

Furthermore, the screw 8a may be omitted in FIG. 4 and only the spring 20 may be used.

[Brief explanation of drawings]

FIG. 1 is a front view of a grid adjustment device according to an embodiment of the present invention, FIG. 2 is a partially cutaway front view of the device shown in FIG. 1 with the support body cut away, and FIG. Equipment III-I
A sectional view taken along line II and FIG. 4 are partially cutaway front views showing a modification of the adjustment device. In the symbols used in the drawings, 1 is a through hole, and 2 is a through hole.
is a support body, 3 is a notched flat surface, 4 is a grid holder, 5,
6 is a screw hole, 7 is a first fine adjustment screw, 8 is a second fine adjustment screw, 9 is one end, 10 is a center axis, 11 is a bisecting point, 12
is a straight line, and 13 is the other end.

Claims (3)

[Scope of utility model registration request] (1) A support having a substantially circular through hole, having an outer diameter that creates a minute gap with respect to the through hole, and being inserted into the through hole, and having a flat cutout surface on the outer periphery. a cylindrical optical device holder provided therein; and a cylindrical optical device holder screwed onto the support so as to be adjustable from the outside, the tip of which presses near one end of the flat surface of the optical device holder; , a fine adjustment screw extending substantially parallel to a straight line including a central axis of the optical device holder and a bisecting point of the flat surface, and a portion near the other end of the flat surface of the optical device holder; An optical system fine adjustment device that is separated from a suppressing member that presses the optical system such that it can be displaced. (2) The pressing member is screwed onto the support body so as to be adjustable from the outside, and its tip presses the vicinity of the other end of the flat surface of the optical device holder; The optical system fine adjustment device according to claim 1, which is a fine adjustment screw extending substantially parallel to a straight line including the central axis of the holder and the bisecting point of the flat surface. (3) The optical system fine adjustment device according to claim 1, wherein the pressing member is a spring.