JPH08278165A - Turning angle detector - Google Patents

Abstract

PURPOSE: To make any slippage in each optical axis of both light emitting and receiving elements be hard to occur, aside from ease to assembly, by attaching them to a setting surface opposed to a bottom surface of a recess of a light emitting and receiving unit, and unifying this unit and a process circuit substrate as one body. CONSTITUTION: A chassis 11 is a bottomed tubular form provided with a recess, and a boss 13 is formed in a bottom part 12 in the tube internal direction. This boss 13 is formed with a hole 14 where a bearing 32 of a turning shaft 31 is fixed. A mounting part 16 of a processing circuit substrate 40 and an engaging part 17 of a cover 45 both are formed in an end 15 at the other side. A light emitting and receiving unit 20 consists of a mounting member 21, a light emitting element 22, a light receiving element 23 or the like, and these elements are integrated in advance. The substrate 40 is formed into a disk form, and its surface is mounted with electronic parts such as chip parts or the like. In addition, this substrate 40 is provided with an input-output terminal, and each end of both these elements 22 and 23 of the unit 20 is connected to the input terminal which is attached to an upper end face 18 of the unit 20 and integrated as one body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation angle detector capable of continuously detecting a rotation angle within a limited range within one rotation.

[0002]

2. Description of the Related Art A conventional rotation angle detector will be described with reference to FIG. FIG. 4 is a diagram showing a configuration of a conventional rotation angle detector, and FIG. 4A is a sectional view showing an assembled state of the rotation angle detector,
(B) is a plan view of the light shielding plate. Reference numeral 60 denotes a rotation angle detector used for detecting a rotation angle within a limited range within one rotation, and is composed of a chassis 61, a rotation unit 70, a processing circuit board 80, a light emitting element fixing plate 85, a cover 90 and the like. There is.

The chassis 61 has a cylindrical shape with a bottom, and a circular convex portion (boss) 63 is formed in the cylindrical direction on a bottom portion 62. The circular convex portion 63 has a bearing 72 of a rotary shaft 71. A hole 64 that is press-fitted is formed. An attachment portion 66 of the processing circuit board 80 and an engagement portion 67 of the cover 90 are formed on the other end portion 65. As the material of the chassis 61, an aluminum material, a die cast alloy, a resin material or the like is used.

The rotating unit 70 is composed of a rotating shaft 71, a bearing 72, a light shielding plate 73, a pressure fitting metal fitting 74 and the like. The outer diameter 79 of the rotating shaft 71 is formed so as to rotate with the inner diameter 75 of the bearing 72, and the light shield plate 73 is provided at one end.
A small-diameter step portion that engages with the mounting hole 76 is formed, and a joint (not shown) that transmits rotation from the mating rotating body is fixed to the other. By fixing the joint, the rotation shaft 71 is prevented from coming off.

The bearing 72 has a cylindrical shape, the outer peripheral surface 77 is press-fitted into the hole 64 of the chassis 61 or fixed by integral molding, and the inner peripheral surface 75 is formed so that the rotating shaft 71 can smoothly rotate. Has been done. As the bearing 72, a bearing member such as a sintered alloy or a ball bearing is used. The light-shielding plate 73 is used to continuously detect the rotation angle within one rotation, and has a disk shape, and has a central portion which is a positioning and rotation preventing member when the rotation shaft 71 is inserted. A circular mounting hole 76,
A continuous slit 78 is formed so that the rotation angle of the detection range can be represented by the distance from the center of the mounting hole 76. A thin steel plate, for example, a thin stainless steel plate is used as the material of the light shielding plate 73, and is formed by etching or the like.

The press-fitting metal fitting 74 is a thin plate and has no annular shape, and a plurality of claws 84 are formed on the inner side. When the light-shielding plate 73 is inserted into the small-diameter step portion of the rotary shaft 71, the press-fitting metal fitting 74 is inserted into the claws. The tip portion of 84 is pressure-contacted and fixed to the outer periphery of the rotary shaft 71, and the light shielding plate 73 is pressure-fixed to the rotary shaft 71 by the spring property of the pressure-contact fitting 74. A thin spring steel plate is used as the material of the press-fitting metal fitting 74.

Reference numeral 80 denotes a processing circuit board, on which electronic components such as a light receiving element (PSD) 81 are mounted on a disk-shaped substrate, and a connection cord 83 of a light emitting element (LED) 82 is connected. The output terminal of the processing circuit board 80 is connected to a control device (not shown). The light from the light emitting element 82 passes through the slit 78 of the light shielding plate 73 fixed to the rotating shaft 71, and its value changes depending on the light receiving position of the light reaching the light receiving element 81. To detect. Then, the detected difference in current value can be converted into a voltage output by the signal processing circuit, and the rotation angle of the rotating shaft 71 connected to the partner rotating body can be continuously detected.

Reference numeral 85 denotes a light emitting element fixing plate, which is mounted on the upper portion 86 of the circular convex portion 63 of the chassis 61 so that the light emitting element 82 is mounted and the optical axis of the light emitting element 82 coincides with the position of the light receiving element 81. The connection cord 83 of the light emitting element 82 is connected to the processing circuit board 80. 90 is a cover for the chassis 6
It is used for waterproofing, dustproofing, etc. inside the chassis 61 by covering the front end portion 65 of the No. 1 unit.

Next, the assembly will be described. First, the chassis 61
The bearing 72 is fixed to the hole 64 of the. Next, the light emitting element 82 of the light emitting element fixing plate 85 is bonded and fixed to the upper portion 86 of the circular convex portion 63 of the chassis 61 with an adhesive or the like facing upward in the drawing.
Separately from the above step, the circular cutout portion of the small-diameter stepped portion at the tip of the rotary shaft 71 and the circular attachment hole 76 of the light shielding plate 73 are inserted together. Next, the pressure contact metal fitting 74 is inserted into the small-diameter step portion into which the light shield plate 73 is inserted, and the light shield plate 73 is pressure-contacted and fixed to the receiving end surface 87 of the rotary shaft 71 by the bottom surface 88 of the pressure contact metal fitting 74.

Next, the rotary shaft 71 with the shading plate 73 assembled is inserted into the inner diameter 75 of the bearing 72 from above in the drawing, and a joint for transmitting the rotation from the mating rotary body is fixed to the terminal end of the rotary shaft 71 for rotation. Prevent the shaft 71 from coming off. Next, the light receiving element 81 of the processing circuit board 80 is aligned with the optical axis of the light emitting element 82 of the light emitting element fixing plate 85 previously fixed, and the lead wire 83 of the light emitting element 82 is soldered or the like. 80 electrically connected to the processing circuit board 80
Is fixed to the board mounting portion 66 in the opening of the chassis 61 with an adhesive or the like.

Finally, the cover 90 for the opening of the chassis 61
A cover 90 is put on the engaging portion 67 of the above to adhere and fix it with an adhesive or the like to waterproof and dustproof the inside of the chassis 61.

[0012]

However, in the above-described rotation angle detector 60, the optical axes of the light emitting element 82 and the light receiving element 81 may be deviated from each other due to a component processing error or an assembly error.
In the worst case, there is a problem that the light of the light emitting element 82 shifts out of the detection range of the light receiving element 81 and the rotation angle cannot be detected. In order to solve this problem, a light emitting element 82 and a light receiving element 81 can be considered as a unit, but if such a unit is used, it is necessary to install a light shielding plate in the concave portion of the unit, or assembly becomes difficult, or A space for assembling the unit is required on the outer peripheral side of the light shielding plate, which causes a problem that the rotation angle detector 60 becomes large.

Therefore, the present invention solves the above problems, and an object of the present invention is to provide a rotation angle detector which is easy to assemble and which is less likely to cause deviation of the optical axes of the light emitting element and the light receiving element from occurring and which is highly reliable. And

[0014]

SUMMARY OF THE INVENTION The present invention achieves the above-mentioned object, that is, a rotary shaft that rotates in conjunction with the rotary shaft of an object to be measured, and a rotation angle of the rotary shaft that is fixed to the rotary shaft. , A disc having continuous slits corresponding to each other, a light emitting element and a light receiving element for receiving light of the light emitting element face each other with the slit forming portion of the disc sandwiched therebetween, and are integrally fixed to a mounting member. The light emitting / receiving unit, the processing circuit board for processing the light received by the light receiving element, and the recess, the rotation shaft being vertically held in the recess, the disk, the light emitting / receiving unit, and the A non-contact rotation angle detector which is composed of a case for mounting and holding a processing circuit board and the like, a cover for covering the upper surface of the recess of the case, and the like, which continuously detects the rotation angle within a limited range within one rotation of the rotation shaft. In, the slit of the disk Ku, characterized in that it is formed by deleting the part.

Further, the processing circuit board is attached to a mounting surface of the light emitting and receiving unit that faces the bottom surface of the recess, the light emitting and receiving unit and the processing circuit board are integrated, and the light emitting and receiving unit serves as the processing circuit board. It is characterized in that it is attached to the bottom surface of the recess via the above. Further, the processing circuit board is attached to a mounting surface of the light emitting and receiving unit that faces the side surface of the recess, the light emitting and receiving unit and the processing circuit board are integrated, and the light emitting and receiving unit is connected via the processing circuit board. It is characterized in that it is attached to the side surface of the recess.

[0016]

According to the present invention, since a part of the disc other than the slit is removed, the light emitting element and the light receiving element are mounted on the same mounting member, and the optical axes of the light emitting element and the light receiving element are adjusted. It is possible to insert the disk into the case from the deleted portion of the disk in the state of the unit which has been completed in advance and to assemble it to the case. In addition, since the light emitting element and the light receiving element are united, the optical axes of the light emitting element and the light receiving element are less likely to shift.

According to the second aspect of the present invention, the processing circuit board is attached to and integrated with the lower portion of the light emitting and receiving unit, whereby the number of assembling steps to the case and the shape of the case can be simplified. According to the third aspect of the present invention, the processing circuit board is attached to the back of the unit so that it can be easily attached to and detached from the case. Therefore, even if a defect such as a failure occurs, inspection or repair is required. Alternatively, replacement becomes easy and quick repair can be performed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram showing a configuration of a rotation angle detector of the first embodiment, (a) is a sectional view showing an assembled state of the rotation angle detector,
(B) is a plan view of the light shielding plate. Reference numeral 10 denotes a rotation angle detector used for detecting a rotation angle within a limited range within one rotation, and includes a chassis 11, a light emitting / receiving unit 20, a rotation unit 30, a processing circuit board 40, a cover 45, and the like. .

The chassis 11 has a cylindrical shape with a bottom having a concave portion, and a circular convex portion (boss) 13 is formed on the bottom portion 12 in the inward direction of the cylinder, and the circular convex portion 13 has a rotating shaft. 31
The hole 14 to which the bearing 32 of is fixed is formed. An attachment portion 16 of the processing circuit board 40 and an engagement portion 17 of the cover 45 are formed on the other end portion 15. Chassis 1
An aluminum material, a die cast alloy, a resin material, or the like is used as the material of 1.

The light emitting / receiving unit 20 is composed of a mounting member 21, a light emitting element 22, a light receiving element 23, etc., and is integrated in advance. The mounting member 21 is a member for mounting the light emitting element 22 and the light receiving element 23, and has a U shape, and mounting holes for mounting the light emitting element 22 and the light receiving element 23 are formed on both inner sides 24 and 25 of the U shape. , Light emitting element 22
Also, when the light receiving element 23 is attached to the attachment member 21, the optical axes of the light emitting element 22 and the light receiving element 23 are previously aligned. The connection cord 26 of the light emitting element 22 and the light receiving element 23 is adapted to pass through the inside of the mounting member 21. A resin material is used as the material of the mounting member 21.

The rotary unit 30 is composed of a rotary shaft 31, a bearing 32, a light shielding plate 33, a pressure fitting 34 and the like. The outer diameter 41 of the rotary shaft 31 is formed so as to rotate with the inner diameter 37 of the bearing 32, and the light shielding plate 33 is provided at one end portion.
A step portion having a small diameter that engages with the mounting hole 35 is formed, and a joint (not shown) for transmitting the rotation from the mating rotating body is fixed to the other.

The bearing 32 has a cylindrical shape, the outer diameter 36 is press-fitted into the hole 14 of the chassis 11, and the inner diameter 37 is formed so that the rotating shaft 31 can smoothly rotate.
As the bearing 72, a bearing member such as a sintered alloy or a ball bearing is used. The light-shielding plate 33 is used to continuously detect the rotation angle within one rotation, and has a disk shape, and has a central portion that serves as a rotation stop and a positioning member when the rotation shaft 31 is inserted. A circular mounting hole 35 and a continuous slit 38 having a thin groove are formed so that the rotation angle of the detection range can be represented by the distance from the center of the mounting hole 35. In addition, the light blocking plate 33
In a portion where the slit 38 is not formed, a deletion portion 39 is provided so that the light emitting and receiving unit 20 can be easily inserted into the chassis 11 at the time of assembly described later. The deletion unit 3
Since 9 is provided in a portion other than the slit 38, it does not interfere with the original light detection. The light shielding plate 33 is made of, for example, a thin stainless steel plate and is formed by etching or the like.

The press-fitting metal fitting 34 is a thin plate and has no annular shape, and a plurality of claws 44 are formed on the inside thereof. When the light-shielding plate 33 is inserted into the small-diameter step portion of the rotary shaft 31, the press-fitting metal fitting 34 is inserted into the claws. The tip portion of 44 is fixed to the outer circumference of the rotating shaft 31 by pressure contact, and the light shielding plate 33 is fixed to the rotating shaft 3 by the spring property of the pressure contact metal fitting 34.
Fix it by pressure contact with 1. A thin spring steel plate is used as the material of the press fitting 34.

The processing circuit board 40 has a disk shape, and electronic parts such as chip parts are mounted on the surface thereof. The processing circuit board 40 has input / output terminals, and the terminals of the light emitting element 22 and the light receiving element 23 of the light emitting / receiving unit 20 are connected to the input terminals and are attached to the upper end surface 18 of the light emitting / receiving unit 20 to be integrated. The output terminal is connected to a control device (not shown). The light emitted from the light emitting element 22 is rotated by the rotating shaft 31.
The difference in the current value flowing out from both ends of the light receiving element 23, which passes through the slit 38 of the light shielding plate 33 fixed to and changes its value depending on the light receiving position of the light reaching the light receiving element 23, is detected. Then, the detected difference in the current value is converted into a voltage output by the signal processing circuit, and the rotating shaft 31 connected to the partner rotating body is used.
The rotation angle of can be continuously detected.

The cover 45 covers the opening end portion 15 of the chassis 11 and is used for waterproofing and dustproofing the inside of the chassis 11. Next, the assembly will be described. The bearing 32 is press-fitted into the hole 14 of the chassis 11. In a step different from the above, the circular cutout portion of the small-diameter stepped portion at the tip of the rotary shaft 31 and the circular attachment hole 35 of the light shielding plate 33 are inserted together. Next, the pressure contact fitting 34 is inserted into the small-diameter step portion into which the light shield plate 33 is inserted, and the light shield plate 33 is fixed by pressure contact with the receiving end surface 42 of the rotary shaft 31 at the bottom surface 43 of the pressure contact metal fitting 34.

Next, the rotary shaft 31 with the shading plate 33 assembled therein is inserted into the inner diameter 37 of the bearing 32 from above in the drawing. And
A joint that transmits the rotation from the mating rotating body is fixed to the terminal end of the rotating shaft 31 to prevent the rotating shaft 31 from coming off.
Next, the deletion portion 39 of the light shielding plate 33 is aligned with the mounting position of the light emitting and receiving unit 20. Then, in a state where the processing circuit board 40 is attached to and integrated with the upper end surface 18 of the light emitting and receiving unit 20, the processing circuit board 40 is placed upward and is inserted into the chassis 11 from above through the deletion portion 39 of the light shielding plate 33. Then, the reference point of the slit 38 of the light shielding plate 33 is aligned with the optical axes of the light emitting element 22 and the light receiving element 23 of the light emitting and receiving unit 20, and the light emitting and receiving unit 20 and the processing circuit board 40 are mounted on the board mounting portion 16 of the opening of the chassis 11. Adhesively fix with an adhesive or the like.

Finally, the cover 45 is put on the engaging portion 17 of the cover 45 formed in the opening of the chassis 11 and adhered and fixed by an adhesive or the like to waterproof and dustproof the inside of the chassis 11. As described above, according to this embodiment, the light shielding plate 33
By removing a part of the above, the light emitting element 22 and the light receiving element 23 are attached to the U-shaped mounting member 21 to form a unit, and the optical axes of the light emitting element 22 and the light receiving element 23 are adjusted, and then assembled to the chassis 11. As a result, it is possible to improve the assembly quality and reduce the number of assembling steps.

In the present embodiment, the removing portion 39 of the light shielding plate 33 is used.
Is a semi-circular shape, but is not limited to this, and at least for the portion where the slit 38 is not formed (that is, the portion of the width of the slit 38 which is not used for angle detection), at least the light emitting / receiving unit 2
It is also possible to delete only the size corresponding to the upper part of 0 (the part facing the processing circuit board 40) or the lower part opposite thereto. In addition, the light emitting and receiving unit 2 of this embodiment
In 0, the light emitting element 22 and the light receiving element 23 are attached to the mounting member 21 formed in a U shape to form a unit, but there is no particular focus on this, for example, a combination of a flat plate and an L-shaped bracket,
As long as the light emitting element 22 and the light receiving element 23 are opposed to each other and the mounting and integral structure is such that the optical axes are matched with each other in advance, the same effect as this embodiment can be obtained.

A second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a diagram showing the configuration of the rotation angle detector of the second embodiment, (a) is a sectional view showing the assembled state of the rotation angle detector,
(B) is a plan view of the light shielding plate. The second embodiment is the first
Since the processing circuit board 40 of the embodiment and its mounting position are changed, and other parts are substantially the same as those of the first embodiment, the same components are designated by the same reference numerals and the description thereof will be omitted.

Reference numeral 50 denotes a chassis in which the mounting position of the processing circuit board 40 is changed to the bottom surface 51 of the recess.
The opening is not required to have a board mounting portion, and the shape is simplified as compared with the chassis 11 of the first embodiment. Others are substantially the same as the chassis 11 of the first embodiment. Reference numeral 53 denotes a processing circuit board, which is a ring-shaped board having an outer diameter 54 slightly smaller than the inner diameter 52 of the chassis 50, and an inner diameter 55 slightly larger than the outer diameter of the convex portion 13 of the chassis 50.
Electronic components such as chip components are mounted on the surface. The processing circuit board 53 has input / output terminals, and the input terminals are connected to the terminals of the light emitting element 22 and the light receiving element 23 of the light emitting / receiving unit 20, and are attached to the lower surface of the light emitting / receiving unit 20 to be integrated. The output terminal is connected to a control device (not shown). The light emitted from the light emitting element 22 is rotated by the rotating shaft 31.
The difference between the current values flowing out from both ends of the light receiving element 23, the value of which passes through the slit 38 of the light shielding plate 33 fixed to and reaches the light receiving element 23 depending on the light receiving position, is detected. Then, the detected difference in the current value is converted into a voltage output by the signal processing circuit, and the rotating shaft 31 connected to the partner rotating body is used.
The rotation angle of can be continuously detected.

Next, the assembly will be described. Hole 1 in chassis 50
The bearing 32 is press-fitted into 4. Next, the processing circuit board 53 is connected to and integrated with the lower portion 58 of the light emitting / receiving unit 20. Then, the processing circuit board 53 is inserted downward from the opening of the chassis 50 in an integrated state, the lower end mounting surface of the processing circuit board 53 is brought into close contact with the bottom surface 51 of the recessed portion of the chassis 50, and is attached by an adhesive or the like. Fix the agent.

In a step different from that described above, the small-diameter stepped portion of the rotary shaft 31 and the mounting hole 35 of the light-shielding plate 33 are inserted together. Next, the pressure fitting 34 is attached to the light shield plate 3.
3 is inserted into the small-diameter stepped portion, and the bottom surface 43 of the pressure contact metal fitting 34 press-fixes the light shielding plate 33 to the receiving end surface 42 of the rotary shaft 31. Then, the rotary shaft 31 is inserted into the inner diameter 37 of the bearing 32 from above in the drawing, with the removed portion 39 of the light shielding plate 33 aligned with the direction of the light emitting and receiving unit 20. Then, a joint for transmitting the rotation from the other rotating body is fixed to the terminal end of the rotating shaft 31 to prevent the rotating shaft 31 from coming off.

Finally, the cover 45 is put on the engaging portion 17 of the cover 45 formed in the opening of the chassis 50 and fixed by an adhesive or the like to waterproof and dustproof the inside of the chassis 11. As described above, also in this embodiment, as in the first embodiment, it is possible to improve the assembly quality and reduce the assembly man-hours. In addition to this, the chassis 50 is raised to provide an area for mounting the processing circuit board 53, but since the processing circuit board 53 can be housed inside the chassis 11, the above area can be deleted and the shape of the chassis 50 can be simplified. Therefore, the rotation angle detector 10 can be downsized.

A third embodiment of the present invention will be described with reference to FIG. FIG. 3 is a diagram showing the configuration of the rotation angle detector of the third embodiment, (a) is a cross-sectional view showing the assembled state of the rotation angle detector,
(B) is a plan view of the light shielding plate. The third embodiment is the second
The processing circuit board 53 of the embodiment is changed in its mounting position, and other parts are substantially the same as those of the second embodiment, and therefore, the same components are denoted by the same reference numerals and the description thereof will be omitted.

Reference numeral 57 denotes a processing circuit board, which is a rectangular plate-shaped board on the surface of which electronic parts such as chip parts are mounted. The processing circuit board 53 has input / output terminals, and the input terminals include the light emitting element 22 and the light receiving element 2 of the light emitting / receiving unit 20.
3 is connected to the rear surface 56 of the light emitting and receiving unit 20,
That is, it is attached to and integrated with a mounting surface facing the inner surface of the recess. The output terminal is connected to a signal processing circuit (not shown). The light emitted from the light emitting element 22 is rotated by the rotating shaft 31.
The difference in the current value flowing out from both ends of the light receiving element 23, which passes through the slit 38 of the light shielding plate 33 fixed to and changes its value depending on the light receiving position of the light reaching the light receiving element 23, is detected. Then, the detected difference in current value is converted into a voltage output by the signal processing circuit, and the rotation angle of the rotating shaft 31 connected to the partner rotating body can be continuously detected.

Next, the assembly will be described. Hole 1 in chassis 50
The bearing 32 is press-fitted into 4. Next, the processing circuit board 57 is attached to the back portion 56 of the U-shaped mounting member 21 of the light emitting / receiving unit 20.
Connect and integrate. Then, in the integrated state, the processing circuit board 57 is inserted from the opening in the direction of the inner circumference 52 of the chassis 50, and the back surface 59 of the processing circuit board 57 is fixed to the inner side surface of the recess with an adhesive or the like.

In a step different from the above, the mounting hole 3 is formed in the circular shape of the small-diameter stepped portion at the tip of the rotary shaft 31 and the circular shape of the light shielding plate 33.
Insert 5 together. Next, the pressure welding metal fitting 34 is attached to the light shielding plate 33.
Is inserted into the small-diameter step portion where the
At 3, the shading plate 33 is pressed and fixed to the receiving end surface 42 of the rotating shaft 31. Then, the rotary shaft 31 is inserted into the inner diameter 37 of the bearing 32 from above in the drawing, with the removed portion 39 of the light shielding plate 33 aligned with the direction of the light emitting and receiving unit 20. Then, a joint for transmitting the rotation from the other rotating body is fixed to the terminal end of the rotating shaft 31 to prevent the rotating shaft 31 from coming off.

Finally, the cover 45 is put on the engaging portion 17 of the cover 45 formed in the opening of the chassis 50 and fixed by an adhesive agent to waterproof and dustproof the inside of the chassis 50. As described above, in this embodiment, by integrating the light emitting / receiving unit 20 and the processing circuit board 57, it is possible to improve the assembly quality and reduce the assembly man-hours as compared with the first embodiment as in the second embodiment. Can be achieved. Even if a malfunction such as a failure occurs in the rotation angle detector 10, the integrated light emitting and receiving unit 20 and the processing circuit board 57 can be easily taken out, inspected, repaired or replaced, and prompt repair can be performed.

[0039]

As described above, according to the present invention, by removing a part of the light shielding plate, the light emitting element and the light receiving element are mounted on the mounting member to form a unit, and the light emitting and receiving unit and the processing circuit board are integrated. Assembled on the chassis in this state, the assembly quality can be improved and the assembly man-hour can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a rotation angle detector of a first embodiment of the present invention, (a) is a sectional view showing an assembled state of the rotation angle detector, and (b) is a plan view of a light shielding plate. .

2A and 2B are views showing a configuration of a rotation angle detector according to a second embodiment of the present invention, FIG. 2A is a sectional view showing an assembled state of the rotation angle detector, and FIG. 2B is a plan view of a light shielding plate. .

3A and 3B are views showing a configuration of a rotation angle detector according to a third embodiment of the present invention, FIG. 3A is a sectional view showing an assembled state of the rotation angle detector, and FIG. 3B is a plan view of a light shielding plate. .

FIG. 4 is a diagram showing a configuration of a conventional rotation angle detector,
(A) is a sectional view showing an assembled state of the rotation angle detector,
(B) is a plan view of the light shielding plate.

[Explanation of symbols]

 10 ... Rotation angle detector 11, 50 ... Chassis 20 ... Light emitting / receiving unit 21 ... U-shaped mounting member 22 ... Light emitting element 23 ... Light receiving Element 26 ... Connection cord 30 ... Rotating unit 31 ... Rotating shaft 32 ... Bearing 33 ... Shading plate 34 ... Press fitting 35.・ ・ ・ ・ Mounting hole 38 ・ ・ ・ Slit 39 ・ ・ ・ Deleted part 40, 53, 57 ・ Processing circuit board 45 ・ ・ ・ Cover

Claims (3)

[Claims] 1. A rotary shaft that rotates in conjunction with a rotary shaft of an object to be measured; a disc fixed to the rotary shaft and having a slit continuously formed corresponding to a rotation angle of the rotary shaft; A light emitting element and a light receiving element that receives the light of the light emitting element face each other with a slit forming portion of the disc interposed therebetween, and a light emitting and receiving unit integrally fixed to a mounting member, and a light received by the light receiving element is processed. A processing circuit board having a recess, a case for holding the rotating shaft vertically in the recess, and for attaching and holding the disk, the light emitting and receiving unit, the processing circuit board, and the like; and an upper surface of the recess of the case. A non-contact rotation angle detector, which is composed of a cover for covering the rotation axis and continuously detects the rotation angle within a limited range of one rotation of the rotation shaft, except for a part of the disc except the slit. Rotation angle test characterized by Producer. 2. The processing circuit board is attached to a mounting surface of the light emitting and receiving unit that faces the bottom surface of the recess, the light emitting and receiving unit and the processing circuit board are integrated, and the light emitting and receiving unit serves as the processing circuit board. The rotation angle detector according to claim 1, wherein the rotation angle detector is attached to the bottom surface of the recess via the above. 3. The processing circuit board is attached to a mounting surface of the light emitting and receiving unit that faces the side surface of the recess, the light emitting and receiving unit and the processing circuit board are integrated, and the light emitting and receiving unit includes the processing circuit board. The rotation angle detector according to claim 1, wherein the rotation angle detector is attached to a side surface of the concave portion via.