JP2024012600A - Optical module and reflection encoder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical module capable of obtaining a good detection accuracy, and to provide a reflection encoder.

SOLUTION: An optical module 10A includes a support 20 having a bottom wall part 21 and a side wall part 22 with wiring 23, a photosensitive element 30 disposed on the bottom wall part 21 so that a first photosensitive surface 31a and a second photosensitive surface 32a face one side S, a first FOP 40 disposed on the first photosensitive surface 31a, a second FOP 50 disposed on the second photosensitive surface 32a, a photoemission element 60 disposed on the photosensitive element 30 so as to be positioned between the first FOP 40 and the second FOP 50, a first wire 11 for connecting a terminal 24 of the wiring 23 and a first terminal 33 of the photosensitive element 30, and a first resin member 13 for covering the terminal 24, the first terminal 33 and the first wire 11. An end surface 22a of one side S of the side wall part 22 is disposed on one side S from the first photosensitive surface 31a and the second photosensitive surface 32a.

SELECTED DRAWING: Figure 3

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to an optical module and a reflective encoder.

A transmission encoder is known that includes a rotating plate having a light passage pattern, a light source placed on one side of the rotating plate, and a light receiving element placed on the other side of the rotating plate (for example, Patent Document 1 reference).

Japanese Patent Application Publication No. 2005-37333

By the way, the types of encoders include not only the transmission type encoder as described above, but also the reflection type encoder, which includes a rotating plate having a light reflection pattern, and a light source and a light receiving element arranged on the same side of the rotating plate. Are known. When comparing a transmissive encoder and a reflective encoder, it is said that the reflective encoder is more advantageous than the transmissive encoder in terms of reducing the size and cost of the encoder. On the other hand, from the viewpoint of detection accuracy, it is said that a transmissive encoder is more advantageous than a reflective encoder.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an optical module that can obtain good detection accuracy when applied to a reflective encoder, and a reflective encoder equipped with such an optical module.

The optical module of the present invention is an optical module applied to a reflective encoder, and includes a bottom wall portion provided with wiring and an area on the bottom wall portion when viewed from one side of the bottom wall portion. a support body having a side wall portion, and a first light receiving surface and a second light receiving surface, the first light receiving surface and the second light receiving surface are disposed on the bottom wall portion so as to face one side; In this case, a light receiving element surrounded by a side wall portion, a first input surface constituted by one end surface of a plurality of first optical fibers, and a first output surface constituted by the other end surface of a plurality of first optical fibers. a first fiber optic plate disposed on the light receiving element such that the first output surface faces the first light receiving surface; a second input surface configured by one end surface of a plurality of second optical fibers; , a second fiber optic plate having a second output surface constituted by the other end surfaces of the plurality of second optical fibers and disposed on the light receiving element such that the second output surface faces the second light receiving surface; A light emitting element disposed on the light receiving element between the first fiber optic plate and the second fiber optic plate, and a first light emitting element that connects the terminal of the wiring and the first terminal of the light receiving element inside the side wall part. a wire; a first resin member disposed on the bottom wall inside the side wall and covering the terminal of the wiring, the first terminal of the light receiving element and the first wire; one end surface of the side wall; It is arranged on one side of the first light receiving surface and the second light receiving surface.

In this optical module, for example, when light is emitted from the light emitting element to the light reflection pattern of the rotary plate included in the encoder, the light reflected by the light reflection pattern is transmitted to the first input surface of the first fiber optic plate. incident on a second input surface of a second fiber optic plate. The light incident on the first input surface is guided by the plurality of first optical fibers and enters the first light receiving surface of the light receiving element via the first output surface of the first fiber optic plate. The light incident on the second input surface is guided by the plurality of second optical fibers and enters the second light receiving surface of the light receiving element via the second output surface of the second fiber optic plate. As a result, compared to the case where the first fiber optic plate and the second fiber optic plate are not provided, the diffusion and attenuation of the light reflected by the light reflection pattern and incident on the first light receiving surface and the second light receiving surface is suppressed. Ru. Further, since the light emitting element is arranged on the light receiving element, the mutual positional relationship between the light emitting surface, the first light receiving surface, and the second light receiving surface of the light emitting element is maintained with high precision. Furthermore, since the light emitting element is located between the first fiber optic plate and the second fiber optic plate, the light emitting element is protected from, for example, physical contact. Further, since the end surface of the side wall portion is disposed on one side of the first light receiving surface and the second light receiving surface, the light receiving element is protected from, for example, physical contact. Furthermore, since the wiring terminals, the first terminals and the first wires of the light-receiving element are covered with the first resin member, the wiring terminals, the light-receiving element can be protected from external forces, oil, etc. A first terminal and a first wire are protected. As described above, according to this optical module, good detection accuracy can be obtained when applied to a reflective encoder.

In the optical module of the present invention, in the first fiber optic plate, the distance between the first input surface and the light emitting element is smaller than the distance between the first output surface and the light emitting element when viewed from one side. The plurality of first optical fibers are inclined, and in the second fiber optic plate, when viewed from one side, the distance between the second input surface and the light emitting element is longer than the distance between the second output surface and the light emitting element. The plurality of second optical fibers may be inclined so as to be small. According to this, the optical path length of the light emitted from the light emitting element and reaching the first input surface and the optical path length of the light emitted from the light emitting element and reaching the second input surface are shortened, so that the light is reflected by the light reflection pattern. As a result, diffusion and attenuation of light incident on the first light receiving surface and the second light receiving surface can be further suppressed.

In the optical module of the present invention, the end surface may be arranged on one side of the first resin member. According to this, the first resin member and, by extension, the first wire can be protected from physical contact, for example. Moreover, the first resin member covering the terminal of the wiring, the first terminal of the light receiving element, and the first wire can be maintained in a stable state.

The optical module of the present invention further includes a second resin member that fixes the first fiber optic plate and the second fiber optic plate to the light receiving element, and the second resin member contacts the side surface of the light emitting element on the light receiving element. You can leave it there. According to this, the bonding strength of the light emitting element to the light receiving element can be improved.

In the optical module of the present invention, the first input surface, the second input surface, and the light emitting surface of the light emitting element may be arranged along the same plane. According to this, for example, even if the position of the optical module with respect to the light reflection pattern of the rotary plate included in the encoder is slightly shifted, the light incident on each of the first input surface and the second input surface due to the position shift is Since distortion in the pattern can be suppressed, better detection accuracy can be obtained.

The optical module of the present invention may further include a second wire that connects the second terminal of the light receiving element and the terminal of the light emitting element, and the end surface may be disposed on one side of the second wire. When the first input surface, the second input surface, and the light emitting surface of the light emitting element are arranged along the same plane, the second wire may protrude to one side from the plane. Even in such a case, the second wire can be protected from physical contact, for example.

The optical module of the present invention further includes a second wire connecting the second terminal of the light receiving element and the terminal of the light emitting element, and the first input surface and the second input surface are arranged on one side of the second wire. You can leave it there. According to this, the second wire can be protected from physical contact, for example.

In the optical module of the present invention, the first input surface and the second input surface may be arranged on one side of the end surface. According to this, the first input surface and the second input surface can be brought close to the light reflection pattern while protecting the second wire from physical contact, for example. Therefore, since the optical path length of the light emitted from the light emitting element and reaching the first input surface and the optical path length of the light emitted from the light emitting element and reaching the second input surface are shortened, the light is reflected by the light reflection pattern and reaches the first input surface. Diffusion and attenuation of light incident on the light receiving surface and the second light receiving surface can be further suppressed.

A reflective encoder of the present invention includes a rotating plate having a light reflecting pattern and the above-described optical module. According to this reflective encoder, good detection accuracy can be obtained for the reasons mentioned above.

According to the present invention, it is possible to provide an optical module that can obtain good detection accuracy when applied to a reflective encoder, and a reflective encoder including such an optical module.

FIG. 1 is a perspective view of a reflective encoder including an optical module according to a first embodiment. 2 is a plan view of the optical module shown in FIG. 1. FIG. 3 is a cross-sectional view of the optical module taken along line III-III in FIG. 2. FIG. FIG. 3 is a cross-sectional view of an optical module according to a second embodiment.

Embodiments of the present invention will be described in detail below with reference to the drawings. In each figure, the same or corresponding parts are denoted by the same reference numerals, and redundant explanations will be omitted.
[First embodiment]
[Encoder configuration]

As shown in FIG. 1, the reflective encoder 1 includes a rotating shaft 2, a rotating plate 3, an optical module 10A, and a processing section 100. The reflective encoder 1 is, for example, an absolute rotary encoder, and detects the absolute angle of a measurement object connected to a rotating shaft 2 that rotates about an axis A as a center line.

The rotating plate 3 is fixed to the rotating shaft 2 and rotates together with the rotating shaft 2. The rotating plate 3 has a main body portion 4 and a light reflecting pattern 5. The main body part 4 is formed in, for example, a disk shape, and is attached to the rotating shaft 2 at the center so as to be orthogonal to the axis A. The main body portion 4 is configured to reduce reflection of light. The light reflection pattern 5 is provided on the surface 4a of the main body portion 4. The light reflection pattern 5 is a light reflection film made of metal such as Cr. The light reflection pattern 5 represents a predetermined pattern such as a gray code.

The optical module 10A is arranged so as to face a part of the surface 4a of the main body part 4, that is, to face a part of the light reflection pattern 5. The position of the optical module 10A is fixed with respect to the rotating plate 3. The optical module 10A emits light to the light reflection pattern 5 and detects the light reflected by the light reflection pattern 5 (that is, the image of the light reflection pattern 5 that changes according to the rotation of the rotary plate 3).

The processing unit 100 is, for example, a signal processing circuit. The processing unit 100 encodes the light detection result by the optical module 10A and outputs a Gray code representing the absolute value of the rotation angle of the rotation axis 2.
[Optical module configuration]

As shown in FIGS. 2 and 3, the optical module 10A includes a support 20, a light receiving element 30, a first FOP (first fiber optic plate) 40, a second FOP (second fiber optic plate) 50, A light emitting element 60 is provided.

The support body 20 has a bottom wall part 21 and a side wall part 22. A plurality of wiring lines 23 are provided on the bottom wall portion 21 . The bottom wall portion 21 is formed of, for example, a glass epoxy resin into a rectangular plate shape. The side wall portion 22 surrounds an area on the bottom wall portion 21 when viewed from one side S of the bottom wall portion 21. The side wall portion 22 is formed into a rectangular frame shape using, for example, glass epoxy resin. One end portion of each wiring 23 is arranged on the surface 21a of one side S of the bottom wall portion 21, and constitutes a terminal 24. When viewed from one side S, the plurality of terminals 24 are arranged, for example, along the inner edge of the side wall portion 22. The other end of each wiring 23 is arranged on a surface 21b of the bottom wall 21 opposite to the surface 21a, and constitutes an external terminal (not shown). The external terminal is a terminal electrically connected to the processing unit 100 via external wiring (not shown).

The light receiving element 30 is fixed to the surface 21a of the bottom wall 21, and is surrounded by the side wall 22 when viewed from one side S. The light receiving element 30 is, for example, a semiconductor light receiving element formed into a rectangular plate shape. The light receiving element 30 has a first light receiving section 31, a second light receiving section 32, a plurality of first terminals 33, and a second terminal 34. The first light receiving section 31 and the second light receiving section 32 are provided on the surface 30a of one side S of the light receiving element 30 in a state where they are spaced apart from each other. That is, the light receiving element 30 is arranged on the bottom wall part 21 so that the first light receiving surface 31a of the first light receiving section 31 and the second light receiving surface 32a of the second light receiving section 32 face one side S. Each of the first light receiving section 31 and the second light receiving section 32 is, for example, a photodiode array, and each of the first light receiving surface 31a and the second light receiving surface 32a is formed in, for example, a rectangular shape. The light receiving element 30 is, for example, a photodiode array chip having a first light receiving section 31 and a second light receiving section 32, each of which is a photodiode array. The plurality of first terminals 33 and second terminals 34 are arranged on the surface 30a of the light receiving element 30. When viewed from one side S, the plurality of first terminals 33 are arranged, for example, along the outer edge of the light receiving element 30 so as to surround the first light receiving surface 31a and the second light receiving surface 32a. The second terminal 34 is arranged between the first light receiving surface 31a and the second light receiving surface 32a when viewed from one side S.

The first FOP 40 is an optical device configured by bundling a plurality of optical fibers, and is formed into, for example, a rectangular plate shape. The first FOP 40 has a first input surface 40a constituted by one end surface of the plurality of first optical fibers 41, and a first output surface 40b constituted by the other end surface of the plurality of first optical fibers 41. . Each first optical fiber 41 extends so as to be able to guide light from the first input surface 40a to the first output surface 40b. The first FOP 40 is arranged on the light receiving element 30 so that the first output surface 40b faces the first light receiving surface 31a.

The second FOP 50 is an optical device configured by bundling a plurality of optical fibers, and is formed into, for example, a rectangular plate shape. The second FOP 50 has a second input surface 50a constituted by one end surface of the plurality of second optical fibers 51, and a second output surface 50b constituted by the other end surface of the plurality of second optical fibers 51. . Each second optical fiber 51 extends so as to be able to guide light from the second input surface 50a to the second output surface 50b. The second FOP 50 is arranged on the light receiving element 30 so that the second output surface 50b faces the second light receiving surface 32a.

The light-emitting element 60 is arranged on the surface 30a of the light-receiving element 30 such that it is located between the first light-receiving surface 31a and the second light-receiving surface 32a when viewed from the one side S, and the light-emitting surface 60a faces the one side S. Implemented. That is, the light emitting element 60 is arranged on the light receiving element 30 so as to be located between the first FOP 40 and the second FOP 50. The light emitting element 60 is, for example, a surface-mounted LED chip. The light emitting element 60 has a terminal 61 provided on the surface of one side S thereof.

In the first FOP 40, a plurality of first light beams are arranged such that the distance between the first input surface 40a and the light emitting element 60 is smaller than the distance between the first output surface 40b and the light emitting element 60 when viewed from one side S. Fiber 41 is inclined. In the second FOP 50, a plurality of second light beams are arranged so that the distance between the second input surface 50a and the light emitting element 60 is smaller than the distance between the second output surface 50b and the light emitting element 60 when viewed from one side S. Fiber 51 is inclined. In this embodiment, the first FOP 40 and the second FOP 50 are each slanted fiber optic plates.

In the plurality of terminals 24 provided on the bottom wall portion 21 and the plurality of first terminals 33 provided on the light receiving element 30, the corresponding terminals 24 and the first terminals 33 are connected to each other by the first wire 11. There is. The second terminal 34 provided on the light receiving element 30 and the terminal 61 provided on the light emitting element 60 are connected to each other by the second wire 12. In the optical module 10A, electrical signals are input and output to and from the light receiving element 30 and the light emitting element 60 via a plurality of wiring lines 23.

The plurality of terminals 24 , the plurality of first terminals 33 , and the plurality of first wires 11 are covered by the first resin member 13 disposed on the bottom wall 21 inside the side wall 22 . The first input surface 40a of the first FOP 40, the second input surface 50a of the second FOP 50, and the light emitting surface 60a of the light emitting element 60 are not covered by the first resin member 13. In this embodiment, the first input surface 40a, the second input surface 50a, and the light emitting surface 60a are arranged on one side S from the first resin member 13. The first resin member 13 is, for example, a black protective resin member. The first FOP 40 and the second FOP 50 are each fixed to the light receiving element 30 by a second resin member 14. The second resin member 14 is, for example, an optical resin member having a refractive index matching function. The second resin member 14 is in contact with the side surface 60b of the light emitting element 60 on the light receiving element 30. The first input surface 40a, the second input surface 50a, and the light emitting surface 60a are not covered with the second resin member 14. In this embodiment, the first input surface 40a, the second input surface 50a, and the light emitting surface 60a are arranged on one side S from the second resin member 14.

Here, with reference to FIG. 3, the positional relationship of each part on one side S will be explained. The end surface 22a of the side wall portion 22 on one side S is arranged on the one side S relative to the first light receiving surface 31a and the second light receiving surface 32a of the light receiving element 30. The end surface 22a of the side wall portion 22 is disposed on one side S relative to the first resin member 13. The first input surface 40a of the first FOP 40, the second input surface 50a of the second FOP 50, and the light emitting surface 60a of the light emitting element 60 are arranged along the same plane P. The end surface 22a of the side wall portion 22 is arranged on one side S of the second wire 12. Note that the state in which the first input surface 40a, the second input surface 50a, and the light emitting surface 60a are arranged along the same plane P means a range of 0.1 mm on one side S with respect to the plane P and the opposite side In this state, the first input surface 40a, the second input surface 50a, and the light emitting surface 60a are arranged within a total range of 0.2 mm within a range of 0.1 mm, for example, the first input surface 40a, the second input surface In this state, the surface 50a and the light emitting surface 60a are arranged on the same plane P.

As explained above, in the optical module 10A, when light is emitted from the light emitting element 60 to the light reflection pattern 5 of the rotary plate 3 included in the reflection encoder 1, the light reflected by the light reflection pattern 5 is The light enters the first input surface 40a of the first FOP 40 and the second input surface 50a of the second FOP 50. The light incident on the first input surface 40a is guided by the plurality of first optical fibers 41, and enters the first light receiving surface 31a of the light receiving element 30 via the first output surface 40b of the first FOP 40. The light incident on the second input surface 50a is guided by the plurality of second optical fibers 51, and is incident on the second light receiving surface 32a of the light receiving element 30 via the second output surface 50b of the second FOP 50. This suppresses the diffusion and attenuation of the light reflected by the light reflecting pattern 5 and incident on the first light receiving surface 31a and the second light receiving surface 32a, compared to the case where the first FOP 40 and the second FOP 50 are not provided. Moreover, since the light emitting element 60 is arranged on the light receiving element 30, the mutual positional relationship of the light emitting surface 60a, the first light receiving surface 31a, and the second light receiving surface 32a of the light emitting element 60 is maintained with high precision. Further, since the light emitting element 60 is located between the first FOP 40 and the second FOP 50, the light emitting element 60 is protected from, for example, physical contact. Further, since the end surface 22a of the side wall portion 22 is disposed on one side S of the first light receiving surface 31a and the second light receiving surface 32a, the light receiving element 30 is protected from physical contact, for example. Furthermore, since the terminal 24 of the wiring 23, the first terminal 33 of the light-receiving element 30, and the first wire 11 are covered with the first resin member 13, they are protected from external forces, oil, etc. that scatter when the reflective encoder 1 is used. , the terminal 24 of the wiring 23, the first terminal 33 of the light receiving element 30, and the first wire 11 are protected. As described above, this optical module 10A can provide good detection accuracy when applied to the reflective encoder 1.

Further, in the optical module 10A, in the first FOP 40, the distance between the first input surface 40a and the light emitting element 60 is smaller than the distance between the first output surface 40b and the light emitting element 60 when viewed from one side S. In the second FOP 50, the distance between the second input surface 50a and the light emitting element 60 is the same as that between the second output surface 50b and the light emitting element 60. The plurality of second optical fibers 51 are inclined so that the distance is smaller than the distance between the two. According to this, since the optical path length of the light emitted from the light emitting element 60 and reaching the first input surface 40a and the optical path length of the light emitted from the light emitting element 60 and reaching the second input surface 50a are shortened, light reflection Diffusion and attenuation of the light reflected by the pattern 5 and incident on the first light receiving surface 31a and the second light receiving surface 32a can be further suppressed.

Furthermore, in the optical module 10A, the end surface 22a is disposed on one side S of the first resin member 13, so that it protects the first resin member 13 and, by extension, the first wire 11, from physical contact, for example. be able to. Moreover, the first resin member 13 covering the terminal 24 of the wiring 23, the first terminal 33 of the light receiving element 30, and the first wire 11 can be maintained in a stable state.

The optical module 10A further includes a second resin member 14 that fixes the first FOP 40 and the second FOP 50 to the light receiving element 30, and the second resin member 14 contacts the side surface 60b of the light emitting element 60 on the light receiving element 30. Therefore, the bonding strength of the light emitting element 60 to the light receiving element 30 can be improved.

Further, in the optical module 10A, the first input surface 40a, the second input surface 50a, and the light emitting surface 60a of the light emitting element 60 are arranged along the same plane P. According to this, for example, even if the position of the optical module 10A with respect to the light reflection pattern 5 of the rotary plate 3 of the reflective encoder 1 is slightly shifted, due to the position shift, the first input surface 40a and the second input Since distortion in the pattern of light incident on each of the surfaces 50a can be suppressed, better detection accuracy can be obtained.

The optical module 10A further includes a second wire 12 that connects the second terminal 34 of the light receiving element 30 and the terminal 61 of the light emitting element 60, and the end surface 22a is arranged on one side S with respect to the second wire 12. ing. When the first input surface 40a, the second input surface 50a, and the light emitting surface 60a of the light emitting element 60 are arranged along the same plane P, the second wire 12 may protrude from the plane P to one side S. be. Even in such a case, the second wire 12 can be protected from physical contact, for example.
[Second embodiment]

As shown in FIG. 4, the optical module 10B is different from the optical module 10A described above in the positional relationship of each part on one side S. In the optical module 10B, the first input surface 40a of the first FOP 40 and the second input surface 50a of the second FOP 50 are arranged on one side S from the second wire 12, and on one side S from the end surface 22a of the side wall part 22. It is located in S. The end surface 22a of the side wall portion 22 is disposed on one side S of the light emitting surface 60a of the light emitting element 60. In this embodiment, the end surface 22a of the side wall portion 22 is disposed on one side S of the second wire 12.

According to the optical module 10B, good detection accuracy can be obtained when applied to the reflective encoder 1 for the same reason as the optical module 10A described above.

Furthermore, in the optical module 10B, since the first input surface 40a of the first FOP 40 and the second input surface 50a of the second FOP 50 are arranged on one side S of the second wire 12, the second input surface 40a is prevented from physical contact. The wire 12 can be protected.

Further, in the optical module 10B, the first input surface 40a of the first FOP 40 and the second input surface 50a of the second FOP 50 are arranged on one side S of the second wire 12, and further than the end surface 22a of the side wall part 22. Since it is arranged on one side S, the first input surface 40a and the second input surface 50a can be brought close to the light reflection pattern 5. Therefore, the optical path length of the light emitted from the light emitting element 60 and reaching the first input surface 40a and the optical path length of the light emitted from the light emitting element 60 and reaching the second input surface 50a are shortened. Diffusion and attenuation of the light reflected and incident on the first light receiving surface 31a and the second light receiving surface 32a can be further suppressed.
[Modified example]

The present invention is not limited to the first and second embodiments described above. For example, the materials and shapes of each structure are not limited to the materials and shapes described above, and various materials and shapes can be employed.

The wiring 23 may be any wire provided on the bottom wall portion 21. The wiring 23 is not limited to a wiring directly formed on the bottom wall 21, but may be a wiring included in a wiring board disposed on the bottom wall 21, for example. In the first FOP 40, a plurality of first light beams are arranged so that the distance between the first input surface 40a and the light emitting element 60 is the same as the distance between the first output surface 40b and the light emitting element 60 when viewed from one side S. A fiber 41 may also be provided. In the second FOP 50, a plurality of second light beams are arranged so that the distance between the second input surface 50a and the light emitting element 60 is the same as the distance between the second output surface 50b and the light emitting element 60 when viewed from one side S. A fiber 51 may also be provided.

DESCRIPTION OF SYMBOLS 1... Reflective encoder, 3... Rotating plate, 5... Light reflection pattern, 10A, 10B... Optical module, 11... First wire, 12... Second wire, 13... First resin member, 14... Second resin member, DESCRIPTION OF SYMBOLS 20... Support body, 21... Bottom wall part, 22... Side wall part, 22a... End face, 23... Wiring, 24... Terminal, 30... Light receiving element, 31a... First light receiving surface, 32a... Second light receiving surface, 33... Third light receiving surface 1 terminal, 34... Second terminal, 40... First FOP (first fiber optic plate), 40a... First input surface, 40b... First output surface, 41... First optical fiber, 50... Second FOP (second fiber optical plate), 50a... second input surface, 50b... second output surface, 51... second optical fiber, 60... light emitting element, 60a... light emitting surface, 60b... side surface, 61... terminal, P... plane.

Claims (9)

An optical module applied to a reflective encoder,
a support provided with wiring;
a light-receiving element having a light-receiving surface and disposed on the support such that the light-receiving surface faces one side;
an input surface formed by one end surface of a plurality of optical fibers, and an output surface formed by the other end surface of the plurality of optical fibers, and placed on the light receiving element such that the output surface faces the light receiving surface. a fiber optic plate arranged;
a light emitting element disposed on the light receiving element together with the fiber optic plate;
optical module. In the fiber optic plate, the plurality of optical fibers are inclined such that the distance between the input surface and the light emitting element is smaller than the distance between the output surface and the light emitting element when viewed from the one side. The optical module according to claim 1. a first wire connecting a terminal of the wiring and a first terminal of the light receiving element;
a first resin member that covers the terminal of the wiring, the first terminal of the light receiving element, and the first wire;
The optical module according to claim 1 or 2, further comprising: The optical module according to claim 3, wherein the first resin member is in contact with a side surface of the fiber optic plate on the light receiving element. further comprising a second resin member that fixes the fiber optic plate to the light receiving element,
The optical module according to claim 1, wherein the second resin member is in contact with a side surface of the light emitting element on the light receiving element. The optical module according to any one of claims 1 to 5, wherein the input surface and the light emitting surface of the light emitting element are arranged along the same plane. The optical module according to claim 6, further comprising a second wire connecting the second terminal of the light receiving element and the terminal of the light emitting element. Further comprising a second wire connecting a second terminal of the light receiving element and a terminal of the light emitting element,
The optical module according to any one of claims 1 to 5, wherein the input surface is located closer to the one side than the second wire. a rotating plate having a light reflection pattern;
The optical module according to any one of claims 1 to 8,
A reflective encoder with a

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