JPH058572Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention is an angle adjustment device that adjusts the rotation angle of an optical component holder holding a reflecting mirror, for example, in order to direct a laser beam in a predetermined direction. More particularly, the present invention relates to an angle adjustment device for an optical component holder used as a means for adjusting the optical axis of an optical cutting machine in the manufacture of video discs, compact discs, and the like.

<Prior art> Fig. 3 shows a conventional angle adjustment device for an optical component holder, in which a holder member 2 holding a reflecting mirror 1, which is an optical component, is rotated by a support shaft 4 on a holding base 3. By pushing a point P away from the pivoting position of the holder member 2 with the manual adjustment screw 7 against the pressure of the rod 6 pushed by the spring 5, the holder member 2 can be pivoted. 2, that is, the surface angle of the reflecting mirror 1 attached to this holder member 2.

FIG. 4 schematically shows an optical axis adjustment device for a laser beam of an optical cutting machine used in the production of conventional video discs or compact discs. In the figure, 8 is a laser oscillator, and the laser beam emitted from here is
The light is reflected at a substantially right angle by hitting the first two-axis movable mirror 10, which can be minutely rotated vertically and horizontally by a first two-axis drive device 9 using a motor or the like as a driving means. This reflected laser beam is turned into two laser beams by the first splitter 11, one straight and one reflected at right angles, and the former is sent to the second two-axis movable mirror 13.
The latter corresponds to the light receiving portion of the first position detector 16. If the distances of these two laser beams from the first splitter 11 to the second two-axis movable mirror 13 and the first position detector 16 are made equal, the laser beam detected by the first position detector 16 The position of the second two-axis movable mirror 1
3 represents the position hit by the laser beam. Therefore, by feeding back the signal of the first position detector 16 to the first two-axis drive device 9, it is possible to create a set of closed-loop optical axis adjustment devices. This device automatically adjusts the position of the laser beam hitting the two-axis movable mirror 13.

Based on the same idea, the second two-axis drive device 1
2. Second two-axis movable mirror 13, second splitter 14, second position detector 17, and reflecting mirror 15
are arranged as shown in FIG. 4 so that the distances from the second splitter 14 to the reflecting mirror 15 and the second position detector 17 are equal, then exactly two sets of closed-loop optical axis adjustment devices are formed. This is a device that combines these in series.

Using this device, first move the first two-axis movable mirror 10, and the laser beam will be directed to a point on the second two-axis movable mirror 13 (this point will be on the opposite slope when moving the two-axis movable mirror 13 for adjustment). The second position detector 17 and the second
If the position where the laser beam hits the reflecting mirror 15 is controlled by the axially movable mirror 13 so that it remains at a fixed point, even if the optical axis of the laser beam that enters the first 2-axis movable mirror 10 varies slightly. Even if it is within the adjustable range of the device, the laser beam finally emitted from the reflecting mirror 15 will be a stable laser beam without fluctuation,
It is used in optical cutting machines, which are the information recording means for video discs or compact discs.

<Problems to be solved by the invention> In the conventional optical component holder angle adjustment device as shown in FIG. 3, the angle adjustment accuracy is as follows.
It relies heavily on the senses of the hands, and requires repeated operations several times to increase the accuracy of adjustment.As a result, adjustment takes time, and it is not suitable for applications where automatic adjustment is performed during operation.

In addition, in the conventional laser beam optical axis adjustment device as shown in FIG. drive device 9,
12 motors are controlled to rotate the two-axis movable mirrors 10 and 13 attached to these two-axis drive devices 9 and 12 vertically and horizontally, but the mechanical The problem was that it required a reduction gear and a complicated motor drive, resulting in a complex and large structure, and its accuracy was not very high despite its high cost.

<Means for solving the problems> In order to solve the problems described above, this invention provides an angle adjustment device for an optical component holder, in which a holder member holding an optical component is rotatably supported on a holding base by a support shaft, a point of the holder member separated from the support position is displaced via a push rod by a screw drive pressing means against a spring pressure displacement, making the rotation angle of the holder member adjustable, and a piezoelectric element whose length changes minutely by changing the voltage applied to it is interposed between the push rod and the screw drive pressing means, wherein the screw drive pressing means is an adjustment screw in which a recess is provided on the inner periphery of a screw that screws into a threaded portion provided on the holding base and a protrusion formed on the inner bottom surface of the recess presses the piezoelectric element abutted against the push rod.

<Function> With the optical component holder angle adjustment device as described above, first, the optical component holder is moved by manual screw drive pressing means against the spring pressure displacement for rough adjustment, and then the optical component holder is roughly adjusted. By changing the voltage applied to the piezoelectric element interposed between the push rod pressed against the holder and the screw drive pressing means, the length of this piezoelectric element changes minutely, causing rotation of the optical component holder. The angle can be finely adjusted.

<Example> FIG. 1 is a partial vertical sectional view of an embodiment of the optical component holder angle adjustment device of this invention, in which a holder member 22 holding a reflecting mirror 21, which is an optical component, is supported on a holding base 23. A push rod that is rotatably supported by a shaft 24, presses a point P remote from the pivot position of this holder member 22 with a rod 26 pressed by a spring 25, and is pushed against the displacement of the pressure. 27 is provided, and as a screw drive pressing means for pushing this push rod 27, a recess is provided on the inner circumference of a cap nut-shaped screw screwed into the threaded portion 23b provided on the holding base 23, and the recess is An adjustment screw 30 with a protrusion 30a formed on the inner bottom surface,
A piezoelectric element 29 whose length changes minutely by changing the applied voltage is interposed between the push rod 27 and the projection 30a.

Figure 2 shows the cap nut-shaped adjustment screw 30 in Figure 1.
Instead, a comparative example is shown in which a screw rod 28a is screwed into the screw hole 23a of the holding base 23, and the adjustment screw 28 is provided with a knob 28b at the base end of the screw rod 28a. Such a long and thin adjustment screw 2
8, it is difficult to downsize the device, but it will be understood that the device can be downsized by using the cap nut-shaped adjusting screw 30 structure of the present invention as shown in FIG.

<Effects of the device> As explained above, this device rotatably supports a holder member holding an optical component on a holding base by a support shaft, and supports the holder member at a point away from the pivot position of the holder member. The rotation angle of the holder member can be adjusted by displacing the holder member through the push rod by the screw drive pressing means against the spring pressing displacement, and a voltage is applied between the push rod and the screw drive pressing means. In the angle adjusting device for an optical component holder that includes a piezoelectric element whose length changes minutely by changing the angle, the screw drive pressing means moves the piezoelectric element in contact with the push rod to the holding base. The adjustment screw has a recess on the inner periphery of the screw that is screwed into the threaded part provided on the holding base, and is pressed by a protrusion formed on the inner bottom surface of this recess. can be arranged concentrically with and outside the piezoelectric element, so that the overhang caused by the adjustment screw can be minimized and the device can be made more compact.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the angle adjusting device for an optical component holder of this invention, Fig. 2 shows a comparative example, Fig. 3 shows a conventional angle adjusting device for an optical component holder, and Fig. 4 shows a conventional angle adjusting device for an optical component holder. The figure is a diagram schematically showing a conventional laser beam optical axis adjustment device. 21...Reflector, 22...Optical component holder,
23... Holding base, 23a... Screw hole, 23b...
...Threaded part, 24... Support shaft, 25... Spring,
26... Rod, 27... Push Rod, 28
... Adjustment screw, 28a ... Screw rod, 28b ... Knob, 29 ... Piezoelectric element, 30 ... Adjustment screw, 3
0a... Protrusion.

Claims (1)

[Scope of Claim for Utility Model Registration] A holder member holding an optical component is rotatably supported on a holding base by a support shaft, and a point remote from the support position of the holder member is driven by a screw via a push rod. The rotation angle of the holder member can be adjusted by displacing it against the spring pressing displacement by the pressing means, and the length can be adjusted by changing the voltage applied between the push rod and the screw drive pressing means. In the angle adjustment device for an optical component holder that includes a piezoelectric element that changes minutely, the screw drive pressing means screws the piezoelectric element that is in contact with the push rod into a threaded portion provided on the holding base. An angle adjustment device for an optical component holder, characterized in that the adjustment screw has a recess formed on the inner circumference of the mating screw, and is pressed by a protrusion formed on the inner bottom surface of the recess.