JPH08220416A - Optical element adjusting device - Google Patents

Abstract

PURPOSE: To provide an optical element adjusting device which can be used for adjustment by anyone and hardly sticks dust, etc., on a reflection surface, etc., with a low cost. CONSTITUTION: A holder 1 is fixed on a base 2 by plural screws and provided with a fixed optical element. A hole 11 out of plural holes which are made in the holder 1 and through which the screws are inserted has an opening smaller than the diameter of the screw 3 and the other hole 12 has the opening larger than the diameter of the screw 4, so that the holder 1 is adjusted to turn around the small opening hole 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical element adjusting device, and more particularly to an optical element adjusting device for rotating and adjusting an optical element such as a reflecting prism or a reflecting mirror.

[0002]

2. Description of the Related Art Conventionally, in an optical element adjusting device such as a reflecting prism or a reflecting mirror, the direction of a reflecting surface can be adjusted, and it is possible to change the processing precision of an optical element or other optical parts or their holding members. The deviation of the generated optical path is corrected by adjusting the direction of the reflecting surface such as the reflecting prism or the reflecting mirror.

FIG. 2 is a diagram showing an example thereof. In FIG. 2, the reflection prism P is a cylindrical protrusion 15 of the holder 1.
It is fixed to the upper surface of the holder 1 with an adhesive or the like so that the center of the reflection surface coincides with the center of the. The holder 1 has a cylindrical projection 15 inserted into the reference hole 25 of the base 2 and is rotatably supported around the projection 15. The holder 1 is rotationally adjusted on the base 2 so that the reflection surface of the reflection prism P faces a predetermined direction, and is fixed by two screws 3 and 4. When the holder 1 is rotationally adjusted, the U-shaped notch 13 is adjusted by setting an adjustment tool (not shown). Also in the case of the reflection mirror, the holder 1 is provided with a wall surface to which the reflection mirror can be fixed with an adhesive or the like, and the reflection mirror is fixed to this wall surface, and the reflection surface of the reflection mirror is adjusted in the same manner as described above.

[0004]

In the conventional technique, the direction of the reflecting surface of the optical element such as the reflecting prism or the reflecting mirror is adjusted in this way. Therefore, it is necessary to provide the holder 1 with the columnar projection 15, and therefore it is necessary to separately provide the base 2 with the reference hole 25 into which the projection 15 is inserted. Therefore, the cost of the members of the holder 1 and the base 2 is increased accordingly.

After the adjustment of the reflection surface, the screws are screwed by the screws 3 and 4. For the adjustment of the reflection surface, the holder 1 is rotated around the protrusion 15 so that the holder 1 is screwed into the screw hole 14. Had to be elongated holes as shown, or both holes had to have large diameters. Therefore, unless the washer 16 is inserted and the screws 3 and 4 are gradually and evenly tightened as illustrated, the angle of the reflecting surface may be displaced.

Thus, although two washers 16 are required and the cost is further increased, it is difficult to adjust the reflecting surface and skill is required. Further, since the reflection prism P, which is an optical element, is attached to the upper surface of the holder 1 in an exposed state as shown in the figure, it is completely defenseless against dust and dirt adhering to the reflection surface.

The present invention has been made to solve the above problems. That is, the cost is low, it can be adjusted by anyone, and it is difficult for dust and dirt to adhere to the reflective surface.
It is intended to provide an optical element adjusting device.

[0008]

The above object is a holder having an optical element fixed to a base and fixed by a plurality of screws, wherein one of a plurality of holes through which the screws provided in the holder penetrate. The optical element adjusting device is characterized in that the hole has a small gap with respect to the screw diameter, the other holes have large gaps with respect to the screw diameter, and the holder is rotationally adjusted around the hole with the small gap. Achieved by

Further, the above-mentioned object is a holder in which an optical element for screwing with a plurality of screws is fixed to a base, and one of the plurality of holes provided in the holder through which the screw penetrates has a screw diameter of On the other hand, the gap is small, and the other holes are holes having a large gap with respect to the screw diameter, and the holder is rotationally adjusted around the hole having the small gap, and the fixing surface side of the holder to which the optical element is fixed is the base. The optical element adjusting device is characterized in that the optical element is brought into contact with the surface of the optical element and the optical element is housed in the hollow hole provided in the base.

[0010]

An embodiment of the present invention will be described below with reference to the accompanying drawings and FIG.

FIG. 1 is a diagram of an embodiment of an optical element adjusting apparatus according to the present invention, (A) is a perspective view for explaining the whole of the present invention, and (B) is a drawing of an adjusting tool.

In FIG. 1, a beam splitter prism BS, which is an optical element, is fixed to the lower surface of a holder 1, which is supported on a base 2 so as to be rotatable in the horizontal direction, with an adhesive or the like. The beam splitter prism BS is adjusted so that the reflecting surface (bonding surface) is in a predetermined direction by the rotation of the holder 1, and is generated due to variations in processing accuracy of the beam splitter prism BS and other optical components or their holding members. Correct the deviation of the optical path.

The hole diameter of the hole 11 formed in the holder 1 is defined as the screw thread diameter of the screw 3 + 0.2 mm.
The hole diameter of the hole 12 is defined as a large diameter with a margin for rotation adjustment of the holder 1. The notch 13 is provided with a notch in which an adjustment tool 5 for rotationally adjusting the holder 1 can be set.

A hollow hole 21 for accommodating the beam splitter prism BS is formed in the base 2. Again 2
Reference numerals 2 and 23 are screw holes, and the holder 1 is screwed by screws 3 and 4 for fixing the holder 1 to the base 2. In this way, the beam splitter prism BS, which is an optical element fixed to the holder 1, is housed in the hollow hole 21 of the base 2. The beam splitter prism B of the holder 1
The size of the fixing surface for fixing S is large enough to cover the hollow hole 21 of the base 2.

The optical path holes 26, 27 and 28 are holes through which light entering and exiting the beam splitter prism BS passes. Further, the reference pin 51 of the adjusting tool 5 is inserted into the hole 24 when the rotation of the holder 1 is adjusted.

Next, the adjustment of the reflecting surface of the beam splitter prism BS, that is, the adjustment of the holder 1 to which the beam splitter prism BS is fixed will be described.

FIG. 1B is a view of the adjusting tool 5 used when adjusting the rotation of the holder 1. A reference pin 51 is provided eccentrically with respect to the outer diameter of the adjusting tool 5. Adjustment of the reflective surface,
The screws 3 and 4 for screwing the holder 1 to which the beam splitter prism BS is fixed to the base 2 are not completely tightened, that is, the holder 1 is semi-tightened so that the holder 1 can be slightly moved. Then, the reference pin 51 of the adjusting tool 5 is used as the base 2
Is inserted into the hole 24, the outer diameter of the adjustment tool 5 is fitted into the notch 13 of the holder 1, and the adjustment tool 5 is rotated. When the adjusting tool 5 is rotated, the reference pin 51 of the adjusting tool 5 is eccentric with respect to the outer diameter of the adjusting tool 5 as described above, so that the holder 1 rotates about the hole 11 as the rotation center to rotate the beam splitter. The angle of the reflecting surface of the prism BS can be adjusted. After the rotation adjustment, the two screws 3 and 4 are tightened to fix the holder 1 to the base 2.

At this time, since the hole 11 serving as the center of rotation is opened within the screw thread diameter of the screw 3 +0.2 mm, when the screw 3 is tightened, the hole 1 has a maximum range of ± 0.1 mm.
Even if the position of 1 varies, there is no problem because the angle of the reflecting surface is slightly affected. Therefore, the screw 3 for fixing the hole 11 does not need a washer as in the conventional example. Further, since the center of the reflecting surface of the beam splitter prism BS does not coincide with the center of rotation, the center of the reflecting surface deviates from the ideal position as it rotates, but in the actual case, the required rotation amount is only 1 °.
There is no problem because it is within the range. Therefore, anyone can adjust the reflective surface without requiring special skill.

As described above, it is not necessary to provide the holder 1 with the cylindrical projection 15 as the axis of rotation as in the conventional example, and the reference hole 25 for inserting the projection 15 into the base 2 is not required. Both 1 and the base 2 have a simple shape, and the cost can be reduced.

By accommodating the beam splitter prism BS which is an optical element in the hollow hole 21 of the base 2 as in this embodiment, it is possible to prevent dust and dirt in the outside air from adhering to the reflecting surface. However, if desired, the holder 1 may be fixed by exposing the beam splitter prism BS to the outside air on the upper surface of the base 2.

The optical element adjusting apparatus of the present invention is not limited to the beam splitter prism as in the embodiment, but can be similarly applied to the case of a reflecting prism, a reflecting mirror or other optical elements as in the conventional example.

[0022]

The effects of the invention according to claims 1, 2, 3, 6 and 7 make it possible to provide an optical element adjusting device which is inexpensive and can be adjusted by anyone.

In addition to the above effects, the effects of the inventions according to claims 4 and 5 make it possible to provide an optical element adjusting device in which dust and dirt are unlikely to adhere to the reflecting surface.

Thus, according to the present invention, the cost is low,
An optical element adjustment device that can be adjusted by anyone, and in which dust and dirt are unlikely to adhere to the reflecting surface is provided.

[Brief description of drawings]

FIG. 1 is a diagram of an embodiment of an optical element adjusting apparatus according to the present invention.

FIG. 2 is a diagram of a conventional example.

[Explanation of symbols]

 1 Holder 11, 12 holes 2 Base 21 Hollow hole 22,23 Screw hole 3, 4 screw BS Beam splitter prism

Claims (7)

[Claims] 1. A holder having an optical element fixed to a base and fastened by a plurality of screws, wherein one hole among a plurality of holes provided in the holder through which the screw penetrates is a gap with respect to a screw diameter. Is small and the other holes are holes having a large gap with respect to the screw diameter, and the holder is rotationally adjusted around the hole having the small gap as a center. 2. The optical element adjusting device according to claim 1, wherein the hole having a small gap is a hole having a gap of 0.2 mm with respect to a screw diameter. 3. The optical element adjusting device according to claim 1, wherein the plurality of screws are at least two screws. 4. A holder in which an optical element screwed by a plurality of screws is fixed to a base, wherein one hole out of a plurality of holes provided in the holder has a gap with respect to a screw diameter. And other holes are holes with a large gap relative to the screw diameter, and the holder is rotationally adjusted around the hole with a small gap, and the fixing surface side of the holder to which the optical element is fixed is the surface of the base. An optical element adjusting device, which is in contact with and accommodates the optical element in a hollow hole provided in the base. 5. The optical element adjusting device according to claim 4, wherein the fixing surface side of the holder to which the optical element is fixed covers a hollow hole provided in the base. 6. The optical element adjusting apparatus according to claim 4, wherein the hole having a small gap is a hole having a gap of 0.2 mm with respect to a screw diameter. 7. The optical element adjusting device according to claim 4, wherein the plurality of screws are at least two screws.