JPH095599A - Position adjusting device for optical element - Google Patents

Abstract

PURPOSE: To fix a holder on a base member without causing positional deviation in an adjusting direction with simple constitution. CONSTITUTION: This device is provided with the base member 20 and a photodetector substrate 30 on whose upper surface a photodetector 10 is fixed. A washer 50 is fixed on the base member 20 by a fixing screw 41. A pressing part 56 is formed on the washer 50 and projected to the inside of an aperture part 52. The abutting part 58 of the pressing part 56 abuts on the upper surface of the photodetector 10, and presses the substrate 30 to the base member 20 with specified pressure from a direction orthogonal to the adjusting direction Q, so that the substrate 30 is fixed on the base member 20. When the position of the photodetector 10 is adjusted, an adjusting tool is fitted in a round hole 35 on the substrate 30, and the substrate 30 is moved in the adjusting direction Q so as to be positioned at a specified position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position adjusting device for an optical element used in an optical information recording / reproducing apparatus or the like for correcting the position deviation of the optical element and fixing it at the adjustment position.

[0002]

2. Description of the Related Art As a conventional device of this type, there is an optical element position adjusting device shown in FIG. The light receiving element 1 is fixed to the upper surface of a light receiving element substrate (holder) 2, and the light receiving element substrate 2 is attached to a base member 6. Each screw 4 penetrates an elongated hole (not shown) formed in the light receiving element substrate 2 through a washer 5 and is screwed into the base member 6, and is tightened by being rotated clockwise. It is loosened by being rotated counterclockwise.

A pair of holes 7 into which an adjusting tool (not shown) is fitted are formed on the light receiving element substrate 2. The light receiving element substrate 2 is positioned on the base member 6 such that the tip of the adjusting tool is fitted into the hole 7 with the screws 4 loosened, and the light receiving element 1 is arranged at a predetermined position. After the positioning is completed, the light receiving element substrate 2 is fixed to the base member 6 by removing the adjustment tool from the hole 7 and then rotating and tightening each screw 4 in the clockwise direction.

[0004]

In the above-mentioned conventional optical element position adjusting device, when tightening each screw 4 after the adjustment, the light receiving element substrate 2 is rotated in the direction of arrow D by the rotational force of the screw 4, There is a problem that the base member 6 is not fixed at a predetermined position due to a position shift.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is possible to fix the holder to the base member with a simple structure without displacement in the adjustment direction, and to position the optical element with high reliability. The purpose is to provide an adjusting device.

[0006]

In a position adjusting device for an optical element according to the present invention, a base member and an optical element are fixed,
It is characterized by having a holder whose position is adjusted along the base member and a pressing means for pressing the holder against the base member in a direction orthogonal to the adjustment direction and fixing the holder to the base member.

[0007]

The present invention will be described below with reference to the illustrated embodiments.
FIG. 1 shows an optical element position adjusting device according to a first embodiment of the present invention. In this embodiment, the light receiving element substrate (holder) 30
The position of the light receiving element 10 fixed on the holder 30 is adjusted by the movement in the arbitrary direction (adjustment direction Q) along the upper surface of the base member 20, and thereby the positional deviation caused by the variation in the processing accuracy of the optical component or the like. Is corrected.

The light receiving element (optical element) 10 is fixed on the upper surface of the light receiving element substrate 30 substantially in the center thereof, and
Is attached to the base member 20 via a washer 50 interposed between the fixing screw 41 and the base member 20.

The washer 50 includes a holding portion 51 and the holding portion 5.
It is formed in a U shape having bent portions 55 formed at the upper and lower ends of 1. The light receiving element substrate 30 is located in the gap formed between the holding portion 51 of the washer 50 and the side surface of the base member 20.

The fixing screw 41 is used for the bent portion 5 of the washer 50.
5 are screwed in at two positions, respectively, and are screwed to the upper surface and the lower surface of the base member 20. The washer 50 is fixed to the base member 20 by tightening these fixing screws 41.

In the vicinity of the light receiving element 10 on the light receiving element substrate 30, two round holes 35 are formed at diagonal positions of the light receiving element 10. When the position of the light receiving element 10 is adjusted, an adjusting tool of a positioning device (not shown) is fitted into the round hole 35.
The positioning device is, for example, a jig to which a pair of round bar-shaped adjustment tools are fixed and which is movable in the plane of the base member 20 to which the light receiving element substrate 30 is attached and in a direction perpendicular to this plane. The light receiving element 10 and the round hole 35 are located in an opening 52 formed in the holding portion 51, and the opening 52 is formed sufficiently large so that the light receiving element 10 can move in the adjustment direction Q. It

The washer 50 has a pressing portion 56 formed of an elastic member. The pressing portion 56 is provided so as to project inward from the side surface of the opening 52, is formed at the tip of the pressing portion 56 and the inclined portion 57 that is inclined toward the light receiving element substrate 30, and contacts the upper surface of the light receiving element substrate 30. The contact portion 58 is in contact with the contact portion 58.

The contact portion 58 of the pressing portion 56 has a predetermined pressure,
That is, in normal use, the light receiving element substrate 30 is pressed toward the base member 20 along the direction orthogonal to the adjusting direction Q with a pressure that does not cause the light receiving element substrate 30 to move in the adjusting direction Q. Therefore, the light receiving element substrate 30
Are fixed to the base member 20.

When adjusting the position of the light receiving element 10,
The tip of the adjusting tool is fitted into the round hole 35 of the light receiving element substrate 30, and the light receiving element substrate 30 is moved in an arbitrary direction in the adjustment direction Q against the pressing force of the pressing portion 56 to receive the light receiving element 1.
Position adjustment of 0 is performed. After the adjustment is completed and the adjustment tool is removed from the light receiving element substrate 30, the light receiving element substrate 30 is fixed to the base member 20 again at the adjustment position by the pressing force of the pressing portion 56.

As described above, in the first embodiment, the pressing portion 56 is always provided in the light receiving element substrate 30 from the direction orthogonal to the adjustment direction Q.
Is pressed against the base member 20, and the light-receiving element substrate 30 can be fixed to the base member 20 with a simple structure without displacement in the adjustment direction Q.

FIG. 2 shows an optical element position adjusting device according to a second embodiment of the present invention. The same or similar members as in the first embodiment are designated by the same reference numerals, and the duplicated description will be omitted.

The light receiving element (not shown) is a light receiving element substrate 30.
The light receiving element substrate 30 provided above is attached to the inside of the base member 20. The opening 25 is formed in the base member 20.
Is formed, and a pair of holes (not shown) into which the light receiving element on the light receiving element substrate 30 and the adjustment tool formed in the vicinity of the light receiving element are fitted are exposed from the opening 25.

The pressing spring 61 is provided between the light receiving element substrate 30 and the support portion 24 formed on the base member 20,
The light receiving element substrate 30 is provided with a predetermined pressure, that is, a pressure at which the light receiving element substrate 30 does not move in the adjustment direction Q in normal use, and the light receiving element substrate 30 is moved from the direction orthogonal to the adjustment direction Q to the base member. It is biased to the 20 side.
As a result, the light receiving element substrate 30 is fixed to the base member 20.

At the time of position adjustment, the adjustment tool is used as the light receiving element 10.
The light-receiving element substrate 30 is moved to an arbitrary position in the adjustment direction Q by fitting it in a pair of holes in the vicinity and pressing it in a predetermined direction. After the adjustment is completed and the adjustment tool is removed from the light receiving element substrate 30, the light receiving element substrate 30 is again moved to the base member 2 at the adjustment position by the action of the biasing force of the pressing spring 61.
Fixed to 0.

The contact surfaces of the pressing spring 61 and the base member 20 are each subjected to a lubrication coating treatment,
At this contact position, almost no force acts on the pressing spring 61 in the adjustment direction Q. Therefore, when the position of the light receiving element substrate 30 is adjusted, the shape of the pressing spring 61 is not distorted in the adjustment direction Q, so that the biasing force to the light receiving element substrate 30 can be kept uniform even after the adjustment is completed.

Also in the second embodiment, the pressing spring 61 presses the light receiving element substrate 30 against the base member 20 with a predetermined pressure from the direction orthogonal to the adjusting direction Q, so that the adjusting direction is simple. The light-receiving element substrate 30 can be fixed to the base member 20 without causing a positional shift in Q.

[0022]

As described above, according to the present invention, the pressing member presses the holder against the base member from the direction orthogonal to the adjusting direction with a predetermined pressure, so that the displacement in the adjusting direction is simple. The holder can be fixed to the base member without any occurrence, and a highly reliable position adjusting device for the optical element can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view showing an optical element position adjusting device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing an optical element position adjusting device according to a second embodiment of the present invention.

FIG. 3 is a perspective view showing a conventional position adjusting device for an optical element.

[Explanation of symbols]

 10 light receiving element 20 base member 30 light receiving element substrate 56 pressing portion 58 abutting portion 61 pressing spring

Claims (4)

[Claims] 1. A base member, a holder to which an optical element is fixed, and a position of which is adjusted along the base member, and the holder is pressed against the base member from a direction orthogonal to the adjustment direction, and the holder is moved to the base. A position adjusting device for an optical element, comprising: a pressing unit that is fixed to a member. 2. The position adjusting device for an optical element according to claim 1, wherein the pressing means is an elastic member that comes into contact with the holder. 3. The position adjusting device for an optical element according to claim 1, wherein the pressing means is a pressing spring that abuts the holder at one end and urges the holder to a base member. 4. The hole formed in the holder, into which an adjustment tool for moving the holder in the adjustment direction against the pressing means by the pressing means is fitted. The position adjusting device for an optical element according to item 1.