JP2007156204A - Mirror holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mirror holder capable of securing comparatively strong holding force when adjusting an angle, flexibly adjusting the holding force in accordance with required adjusting width, hardly causing displacement when locking, and easily manufactured. <P>SOLUTION: The mirror holder 10 includes: a mirror holding member 14; a base member 12; a plurality of angle adjusting screws 22, 24 and 26; a coupling screw 30; a belleville spring group 34; a recess 32 for housing the belleville spring group 34; a through-hole 33 through which the edge of the coupling screw 30 is inserted; a stepped part 32a receiving the compressive stress of the belleville spring group 34; and a screw hole 44 formed in the mirror holding member 14. By inserting the coupling screw 30 through the belleville spring group 34 and screwing the edge of the coupling screw 30 in the screw hole 44 of the mirror holding member 14, the belleville spring group 34 is arranged between the head 30a of the coupling screw 30 and the stepped part 32a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mirror holder for holding a mirror of a laser oscillator and fixing it to an oscillator body or the like, and more particularly to a mirror holder provided with a mechanism for adjusting the angle of the mirror.

A laser oscillator irradiates a laser medium such as a YAG rod installed between a total reflection mirror and an output mirror with excitation light, reflects and amplifies the light emitted from the laser medium between the mirrors, and then partially Is taken out from the output mirror.
And, in order to secure a stable laser output, the direction (parallelism) of the total reflection mirror and the output mirror arranged opposite to each other is extremely important. Therefore, a mirror holder having a mechanism for adjusting the angle of each mirror is provided. Various proposals have been made so far (see the following patent document).
JP2002-21835 JP-A-2005-215507

A mirror holder described in Patent Document 1 includes a front plate for holding a mirror, a main body for mounting in a laser device, a plurality of through holes for storing springs formed at corresponding positions, and the through holes. A tension coil spring to be inserted into the hole, a plurality of through holes for inserting adjustment screws formed in the main body, and a plurality of adjustment screws are provided.
The front plate and the main body are contracted by inserting a tension coil spring into a through hole formed by combining the through holes for storing each spring, and hooking both ends of the front plate and the main body using pins. Bonded by force.
Then, by screwing the adjusting screw into each through hole for inserting the adjusting screw formed in the main body, the tip of the adjusting screw is brought into contact with the inner surface of the front plate. If the optional adjustment screw is further rotated in this state, the amount of protrusion of the adjustment screw increases and the distance between the front plate and the main body changes partially. As a result, the tilt angle or rotation angle of the front plate holding the mirror Adjustment is realized.
In the case of this mirror holder, after the angle adjustment by the adjustment screw is completed, a lock screw is screwed into a lock member that applies a force parallel to the axial direction of the adjustment screw to the adjustment screw, and the tip of the adjustment screw is pressed against the main body. It has a mechanism to lock the movement of

The mirror holder described in Patent Document 2 also includes a plate for holding the mirror, a block for mounting in the laser device, a plurality of through holes for storing springs formed at corresponding positions, and the through holes. A tension coil spring inserted into the inside, a plurality of through holes for insertion of adjustment screws formed in the main body, and a plurality of adjustment screws.
The plate and the block are joined by the contraction force of the spring by inserting a tension coil spring into the through-hole formed by combining the respective spring-accommodating through-holes and hooking both ends of the plate and the block using pins. Is done.
Then, by screwing the adjusting screw into each through hole for inserting the adjusting screw formed in the block, the tip thereof is brought into contact with the inner surface of the plate. If the optional adjustment screw is further rotated in this state, the protruding amount of the adjustment screw increases and the distance between the plate and the block partially changes. As a result, the tilt angle or rotation angle of the plate holding the mirror is adjusted. Is realized.
In the case of this mirror holder, after the angle adjustment by the adjustment screw is completed, the plate is blocked by inserting one fixing screw into the through hole of the block and screwing the tip into the screw hole formed in the plate. The structure to be fastened to is provided.

As described above, each of the mirror holders of Patent Documents 1 and 2 has a structure in which the mirror holding member and the installation member are joined and held by the tensile stress of the coil spring disposed in the through hole of both members. If a tension coil spring with a very strong force is used, it will be difficult to engage the hooks at both ends with each member, and it will be a heavy burden on the hook, so the tensile stress is inevitably limited and high. There was a problem that the holding force could not be realized. For this reason, while adjusting the angle of the mirror by turning the adjusting screw, there has been a drawback that a positional deviation is likely to occur between the two members due to the rotational force.
In addition, once the coil spring is attached, the tensile stress cannot be flexibly adjusted. Therefore, after securing a stronger holding force than usual, the angle between the two members can be finely adjusted with a narrow adjustment width. I couldn't.
In addition, both of them are provided with locking means (angle fixing means) after completion of angle adjustment, but since both of them are a system in which a lock screw is screwed into a place away from the coil spring as the biasing means, there is no positional deviation at the time of locking. It was easy to occur.
Further, as described above, the hooks at both ends of the coil spring need to be hooked on the respective members using pins or the like, and it cannot be said that the production efficiency is good.

  The present invention has been devised to solve the above-described problems of conventional mirror holders, and can ensure a relatively strong holding force during angle adjustment, and can also have a holding force according to a necessary adjustment width. An object of the present invention is to provide a mirror holder that can be flexibly adjusted, is less likely to be displaced when locked, and is easy to manufacture.

In order to achieve the above object, a mirror holder according to the present invention includes a mirror holding member for mounting a mirror, a base member arranged to face the mirror holding member, and a through-hole of the base member, and is screwed into the tip. A plurality of angle adjusting screws that come into contact with the opposing surface of the mirror holding member, a connecting screw for engaging the mirror holding member and the base member, and compression for biasing the mirror holding member and the base member in the joining direction. A spring, a through hole for accommodating the compression spring formed in the base member, a locking portion for receiving the compression stress of the compression spring in the through hole, and a tip of the connection screw formed in the mirror holding member A screw hole into which the compression spring is inserted, and the connecting screw is inserted into the compression spring, and the tip thereof is screwed into the screw hole of the mirror holding member. It is characterized by being disposed between the head and the locking portion of the connecting screw in the through hole of the member.
It is desirable that a plurality of the connecting screws, the compression springs, the through holes and locking portions of the base member, and the screw holes of the mirror holding member are provided.
Further, the through hole of the base member has a shape in which a wide diameter portion for accommodating the compression spring and a narrow diameter portion for inserting the connecting screw are communicated, and the wide diameter portion and the narrow diameter portion The step portion formed between them can function as the locking portion.
The compression spring is preferably composed of a group of disk springs in which a large number of disk springs are stacked, but a compression coil spring can also be used.

In the case of the mirror holder according to the present invention, the compression spring is accommodated in the through hole of the base member, and this compression spring is disposed between the head of the connection screw and the locking portion of the base member, and the tip of the connection screw is It penetrates the base member and is screwed into the screw hole of the mirror holding member.
For this reason, when the connecting screw is loosened, the compressive stress of the compression spring is applied to the locking portion, the base member can be pressed toward the mirror holding member, and the angle can be adjusted with the adjusting screw under a high holding force. .
Further, when the connecting screw is fully tightened, the compression spring is completely contracted and the movable width is almost eliminated, so that the angle between the base member and the mirror holding member can be fixed.

As described above, in the mirror holder according to the present invention, the compression spring is used as a means for urging the mirror holding member and the base member in the joining direction, and the hook for attachment as in the case of the tension spring is used. It is possible to use a compression spring with a higher compressive stress and bias the two members in the joining direction with a stronger force. Is possible.
In addition, the repulsion force (compression stress) of the compression spring can be set to an arbitrary strength by adjusting the looseness of the connecting screw. Therefore, after adjusting the angle once, the pole can be adjusted under a higher holding force than usual. This is convenient when performing fine angle adjustment.
In addition, since the connecting screw functioning as the locking means and the compression spring functioning as the urging means are arranged on the same axis, no extra external force is applied to the compression spring after the angle adjustment is completed, and the position caused by the lock The shift can be suppressed.
Further, the arrangement of the compression spring is completed by passing the connecting screw through which the compression spring is inserted into the through hole of the base member and screwing the tip of the connection screw into the screw hole of the mirror holding member. It becomes possible to raise.

FIG. 1 shows the back surface of the mirror holder 10 according to the present invention, and FIG. 2 is a cross-sectional view taken along the line AA of FIG.
As illustrated, the mirror holder 10 includes a base member 12 and a mirror holding member 14 made of aluminum.
FIG. 3 is a cross-sectional view showing a state where the base member 12 and the mirror holding member 14 are separated.

FIG. 4 is a plan view showing the back surface 16 of the base member 12, and FIG. 5 is a plan view showing the front surface (opposing surface) 18 of the base member 12.
As illustrated, the base member 12 has a substantially L-shaped shape.
As shown in FIGS. 2 and 3, the base member 12 has three through holes 20 extending from the back surface 16 to the front surface 18. Each through hole 20 has a first adjustment for adjusting the tilt angle. A screw 22, a second adjustment screw 24 for fulcrum formation and spacing adjustment, and a third adjustment screw 26 for rotation angle adjustment are respectively inserted and screwed into a female screw formed on the inner surface of the through hole 20 (Only two through holes 20 are shown in FIGS. 2 and 3, but actually three through holes 20 are formed).
A ball 29 is rotatably mounted at the tip of each adjustment screw.

Two recesses 32 are formed in the vicinity of the second adjustment screw 24 on the back surface 16 of the base member 12. Each recess 32 has a diameter sufficient to accommodate the disc spring group 34 inserted through the head side of the connecting screw 30.
A through hole 33 for slidably inserting the distal end side of the connection screw 30 is provided concentrically on the bottom surface of each recess 32, and one through hole is formed by communicating both. .
Further, since the through hole 33 has a smaller diameter than the recess 32, a step 32 a is formed between the bottom surface of the recess 32 and the through hole 33.
The base member 12 has a plurality of through holes 35 for fixing to a laser oscillator body (not shown).

FIG. 6 is a plan view showing the back surface (opposing surface) 36 of the mirror holding member 14, and FIG. 7 is a plan view showing the front surface 38 of the mirror holding member 14.
As illustrated, a frame portion 42 for holding the mirror 40 is formed at the center of the mirror holding member 14.

Further, on the back surface 36 of the mirror holding member 14, a pair of screw holes 44 for inserting the connection screw 30, a first receiving portion 46 with which the ball 29 of the first adjustment screw 22 abuts, and a second A second receiving portion 48 with which the ball 29 of the adjusting screw 24 abuts and a third receiving portion 50 with which the ball 29 of the third adjusting screw 26 abuts are provided.
The first receiving portion 46 has a flat circular shape and is formed by a quenching member such as SK steel. The second receiving portion 48 has a circular shape with a concave portion 52 at the center, and is also formed of a quenching member. As shown in FIGS. 2 and 3, the main bodies of the first receiving portion 46 and the second receiving portion 48 are both fitted in a through hole formed in the mirror holding member 14 and reach the front surface 38. .
On the other hand, the third receiving portion 50 has a pair of shafts 54 made of a quenching member embedded in the back surface 36, and a third adjusting screw 26 along a groove between the shafts 54, 54 arranged in parallel. The ball 29 slides back and forth.

Hereinafter, a method for assembling the mirror holder 10 will be described.
First, as shown in FIG. 3, with the front surface 18 of the base member 12 and the rear surface 36 of the mirror holding member 14 facing each other, the connecting screw 30 is inserted from the back surface 16 side of the base member 12 into the recess 32 and the through hole 33. Let
At this time, a disc spring group 34 (a plurality of disc springs 34a + washers 34b) is inserted into the head 30a side of the connecting screw 30.

Next, the tip of the connecting screw 30 is screwed into the screw hole 44 of the mirror holding member 14.
Then, by tightening the connecting screw 30 against the repulsive force of the disc spring group 34, the base member 12 and the mirror holding member 14 are fixed via the connecting screw 30 as shown in FIG.

As shown in the figure, the disc spring group 34 is disposed between the head 30a of the connecting screw 30 and the bottom surface (step 32a) of the recess 32 so as to be extendable and contractable.
Therefore, if the connecting screw 30 is loosened moderately and the distance between the head 30a and the stepped portion 32a is increased, the base member 12 is strongly biased toward the mirror holding member 14 by the repulsive force of the disc spring group 34. Become.

In order to adjust the tilt angle and the rotation angle of the mirror 40, first, both the connecting screws 30 are loosened to release the locked state.
Even in this case, since the repulsive force of the disc spring group 34 is effective as described above, the mirror holding member 14 and the base member 12 are held sufficiently firmly, and no displacement occurs.
Next, when the first adjusting screw 22 is rotated to the right and left by the required amount, the protruding amount at the tip thereof increases and decreases, and the ball 29 of the second adjusting screw 24 and the concave portion 52 of the second receiving portion 48 are used as fulcrums. The tilt angle between the base member 12 and the mirror holding member 14 is adjusted.
When the third adjustment screw 26 is rotated to the right and left by the required amount, the amount of protrusion at the tip of the third adjustment screw 26 increases and decreases, and the ball 29 of the second adjustment screw 24 and the recess 52 of the second receiving portion 48 are used as fulcrums. Thus, the rotation angle between the base member 12 and the mirror holding member 14 is adjusted.
When the distance between the base member 12 and the mirror holding member 14 is to be adjusted, the second adjusting screw 24 is rotated to the right and left by a necessary amount.
After the above adjustment is completed, both connecting screws 30 are tightened until the disc spring group 34 is fully contracted, and the angle between the base member 12 and the mirror holding member 14 is fixed.

In this mirror holder 10, since a compression spring comprising a disc spring group 34 is used as a means for biasing the base member 12 and the mirror holding member 14 in the joining direction, it is attached like a tension spring comprising a coil spring. There is no need to provide hooks at both ends.
For this reason, a space for storing the hook can be saved, and a larger amount of the disc spring 34a can be stored in the recess 32 of the base member 12, so that the base member 12 can be kept strong even if the thickness of the base member 12 is set relatively thin. It is possible to secure power.

Further, since the repulsive force of the disc spring group 34 can be adjusted by adjusting the looseness of the connecting screw 30, more precise angle adjustment is possible.
That is, when the connecting screw 30 is slightly loosened, a high biasing force is applied to the step portion 32a of the base member 12 instead of narrowing the adjustment width. For this reason, after the angle adjustment between the base member 12 and the mirror holding member 14 is once completed, the angle adjustment with a very small width can be performed with high accuracy while maintaining a strong holding force.

  Further, since the locking connecting screw 30 is inserted into the disc spring group 34 as the biasing means and both are arranged coaxially, an extra external force is applied to the biasing means by the rotation of the connecting screw 30. Therefore, it is possible to effectively prevent the occurrence of displacement when locked.

  Furthermore, the arrangement of the biasing means is completed by passing the connecting screw 30 through the recess 32 and the through hole 33 of the base member 12 while the disc spring group 34 is inserted, and screwing it into the screw hole of the mirror holding member 14. There is an advantage that the manufacture of the mirror holder can be facilitated as compared with the case where a tension spring is used.

In the above, an example has been shown in which the bottom surface (step 32a) of the recess 32 of the base member 12 functions as a locking means that receives the compressive stress of the disc spring group 34, but the present invention is limited to this. It is not a thing.
In short, it is only necessary to receive the compressive stress of the disc spring group 34 and urge the base member 12 toward the mirror holding member 14. For example, a through hole having a diameter sufficient to accommodate the disc spring group 34 is used as a base. It is also possible to form a protrusion that contacts the disc spring group 34 in the through-hole in the member 12.

Since the disc spring has a structure in which a large number of elastic bodies having a relatively small amount of bending are connected, there is an advantage that the relationship between the contraction amount of the whole spring and the compressive stress is stable.
For this reason, the example in which the disc spring group 34 is inserted through the connection screw 30 has been described above. However, instead of the disc spring group 34, a compression coil spring may be inserted through the connection screw 30.

It is a top view which shows the back surface of the mirror holder which concerns on this invention. It is AA sectional drawing of FIG. It is sectional drawing which shows the state which isolate | separated the base member and the mirror holding member. It is a top view which shows the back surface of a base member. It is a top view which shows the front (opposite surface) of a base member. It is a top view which shows the back surface (opposite surface) of a mirror holding member. It is a top view which shows the front of a mirror holding member. It is sectional drawing which shows the state which tightened the connection screw of the mirror holder which concerns on this invention.

Explanation of symbols

10 Mirror holder
12 Base material
14 Mirror holding member
16 Back of base member
18 Front of base member
20 Through hole for adjusting screw
22 First adjustment screw
24 Second adjustment screw
26 Third adjustment screw
29 balls
30 Connection screw
30a Connecting screw head
32 recess
32a Step
33 Through hole
34 Disc spring group
34a Belleville spring
34b washer
35 Fixing through hole
36 Rear side of mirror holding member
38 Front of mirror holding member
40 mirror
42 Frame
44 Screw holes on mirror holding member
46 First receiving part
48 Second receiving part
50 Third receiving part
52 recess
54 shaft

Claims (5)

A mirror holding member for mounting the mirror;
A base member disposed opposite to the mirror holding member;
A plurality of angle adjusting screws that are screwed into the through holes of the base member and whose tips abut against the opposing surface of the mirror holding member;
A connecting screw for engaging the mirror holding member and the base member;
A compression spring for biasing the base member toward the mirror holding member;
A through hole for accommodating the compression spring formed in the base member;
A locking portion that receives the compression stress of the compression spring in the through hole,
A screw hole into which the tip of the connecting screw formed on the mirror holding member is screwed,
The coupling screw is inserted into the compression spring and the tip of the coupling screw is screwed into the screw hole of the mirror holding member, so that the compression spring is engaged with the head of the coupling screw in the through hole of the base member. A mirror holder, which is disposed between the two parts.   2. The mirror holder according to claim 1, further comprising a plurality of the connection screw, the compression spring, the through hole and the locking portion of the base member, and the screw hole of the mirror holding member.   A through hole formed in the base member has a wide diameter portion for accommodating the compression spring and a narrow diameter portion for inserting the connecting screw, and is formed between the wide diameter portion and the narrow diameter portion. The mirror holder according to claim 1, wherein the stepped portion functions as the locking portion.   The mirror holder according to any one of claims 1 to 3, wherein the compression spring comprises a disc spring group in which a large number of disc springs are stacked.   The mirror holder according to claim 1, wherein the compression spring is a compression coil spring.

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