Optical module and reflective encoder

Abstract

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

Description

[Technical field]

[0001] The present invention relates to an optical module and a reflective encoder. [Background technology]

[0002] A transmissive encoder is known that includes a rotating plate having a light transmitting pattern, a light source arranged on one side of the rotating plate, and a light receiving element arranged on the other side of the rotating plate (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-37333 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, as a type of encoder, in addition to the above-mentioned transmissive encoder, a reflective encoder having a rotating plate with a light reflection pattern and a light source and a light receiving element arranged on the same side of the rotating plate is also known. When comparing transmissive encoders and reflective encoders, 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, it is said that the transmissive encoder is more advantageous than the reflective encoder in terms of detection accuracy.

[0005] 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 including such an optical module. [Means for solving the problem]

[0006] The optical module of the present invention is an optical module applied to a reflective encoder, comprising: a support having a bottom wall portion on which wiring is provided and a side wall portion surrounding an area on the bottom wall portion when viewed from one side of the bottom wall portion; a light receiving element having a first light receiving surface and a second light receiving surface, which is disposed on the bottom wall portion so that the first light receiving surface and the second light receiving surface face one side and is surrounded by the side wall portion when viewed from the one side; a first fiber optic plate having a first input surface formed by one end faces of a plurality of first optical fibers and a first output surface formed by the other end faces of the plurality of first optical fibers, which is disposed on the light receiving element so that the first output surface faces the first light receiving surface; the first end face of the side wall portion being disposed on the bottom wall portion and covering the terminal of the wiring, the first terminal of the light receiving element, and the first wire; and a second input surface configured by the second input surface and the second output surface configured by the other end surfaces of the plurality of second optical fibers, the second fiber optic plate being disposed on the light receiving element so that the second output surface faces the second light receiving surface, a light emitting element being disposed on the light receiving element so as to be located between the first fiber optic plate and the second fiber optic plate, a first wire connecting a terminal of the wiring and a first terminal of the light receiving element on the inside of the side wall portion, and a first resin member being disposed on the bottom wall portion and inside the side wall portion and covering the terminal of the wiring, the first terminal of the light receiving element, and the first wire,

[0007] In this optical module, for example, when light is emitted from the light-emitting element toward the light reflection pattern of the rotating plate of the encoder, the light reflected by the light reflection pattern is incident on the first input surface of the first fiber optic plate and the second input surface of the second fiber optic plate. The light incident on the first input surface is guided by the multiple first optical fibers and incident on 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 multiple second optical fibers and incident on the second light receiving surface of the light receiving element via the second output surface of the second fiber optic plate. This suppresses 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, compared to when the first fiber optic plate and the second fiber optic plate are not provided. In addition, since the light-emitting element is disposed on the light receiving element, the relative positions of the light-emitting surface of the light-emitting element, the first light receiving surface, and the second light receiving surface are maintained with high accuracy. Also, 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. Also, since the end face of the side wall portion is located 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 terminal of the wiring, the first terminal of the light-receiving element, and the first wire are covered by the first resin member, the terminal of the wiring, the first terminal of the light-receiving element, and the first wire are protected from, for example, external forces and oil that splashes when the reflective encoder is used. As described above, according to this optical module, good detection accuracy can be obtained when applied to a reflective encoder.

[0008] In the optical module of the present invention, in the first fiber optic plate, the multiple first optical fibers may be inclined so that 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, and in the second fiber optic plate, the multiple second optical fibers may be inclined so that the distance between the second input surface and the light emitting element is smaller than the distance between the second output surface and the light emitting element when viewed from one side. This shortens the optical path length of the light emitted from the light emitting element to the first input surface and the optical path length of the light emitted from the light emitting element to the second input surface, so that 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 can be further suppressed.

[0009] In the optical module of the present invention, the end face may be disposed on one side of the first resin member. This can protect the first resin member and the first wire from, for example, physical contact. Also, 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.

[0010] The optical module of the present invention may further include a second resin member for fixing the first and second fiber optic plates to the light receiving element, and the second resin member may be in contact with a side surface of the light emitting element on the light receiving element, thereby improving the bonding strength of the light emitting element to the light receiving element.

[0011] 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. With this, even if the position of the optical module is slightly shifted with respect to the light reflection pattern of the rotating plate of the encoder, for example, the occurrence of distortion in the light patterns incident on the first input surface and the second input surface due to the position shift can be suppressed, thereby obtaining better detection accuracy.

[0012] The optical module of the present invention may further include a second wire connecting the second terminal of the light receiving element and the terminal of the light emitting element, and the end face may be disposed on one side of the second wire. If the first input surface, the second input surface, and the light emitting surface of the light emitting element are disposed along the same plane, the second wire may protrude to one side of the plane. Even in such a case, the second wire can be protected from, for example, physical contact.

[0013] The optical module of the present invention may further include a second wire connecting a second terminal of the light receiving element and a terminal of the light emitting element, and the first input surface and the second input surface may be disposed on one side of the second wire, which can protect the second wire from physical contact, for example.

[0014] In the optical module of the present invention, the first input surface and the second input surface may be disposed on one side of the end surface. This allows the first input surface and the second input surface to be brought closer to the light reflecting pattern while protecting the second wire from physical contact, for example. Therefore, the optical path length of the light emitted from the light emitting element to the first input surface and the optical path length of the light emitted from the light emitting element to the second input surface are shortened, so that the diffusion and attenuation of the light reflected by the light reflecting pattern and incident on the first light receiving surface and the second light receiving surface can be further suppressed.

[0015] The reflective encoder of the present invention includes a rotating plate having a light reflecting pattern and the optical module described above. With this reflective encoder, good detection accuracy can be obtained for the reasons described above. Effect of the Invention

[0016] 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. [Brief description of the drawings]

[0017] [Figure 1]FIG. 1 is a perspective view of a reflective encoder including an optical module according to a first embodiment. [Diagram 2] FIG. 2 is a plan view of the optical module shown in FIG. [Diagram 3] 3 is a cross-sectional view of the optical module taken along line III-III in FIG. 2. [Figure 4] FIG. 11 is a cross-sectional view of an optical module according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In each drawing, the same or corresponding parts are denoted by the same reference numerals, and duplicated explanations will be omitted. [First embodiment] [Encoder configuration]

[0019] 1, the reflective encoder 1 includes a rotating shaft 2, a rotating plate 3, an optical module 10A, and a processing unit 100. The reflective encoder 1 is, for example, an absolute type rotary encoder, and detects the absolute angle of a measurement object connected to the rotating shaft 2 that rotates about an axis A as a center line.

[0020] 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 4 and a light reflecting pattern 5. The main body 4 is formed, for example, in a disk shape, and is attached to the rotating shaft 2 at its center so as to be perpendicular to the axis A. The main body 4 is configured to reduce reflection of light. The light reflecting pattern 5 is provided on a surface 4a of the main body 4. The light reflecting pattern 5 is a light reflecting film made of a metal such as Cr. The light reflecting pattern 5 represents a predetermined pattern such as a gray code.

[0021] The optical module 10A is disposed so as to face a part of the surface 4a of the main body 4, i.e., so as to face a part of the light reflecting 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 reflecting pattern 5 and detects the light reflected by the light reflecting pattern 5 (i.e., the image of the light reflecting pattern 5 that changes in response to the rotation of the rotating plate 3).

[0022] The processing unit 100 is, for example, a signal processing circuit. The processing unit 100 encodes the optical detection result by the optical module 10A and outputs a Gray code that represents the absolute value of the rotation angle of the rotating shaft 2. [Optical module configuration]

[0023] 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, and a light emitting element 60.

[0024] The support 20 has a bottom wall portion 21 and a side wall portion 22. A plurality of wirings 23 are provided on the bottom wall portion 21. The bottom wall portion 21 is formed, for example, in a rectangular plate shape from glass epoxy resin. 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, for example, in a rectangular frame shape from glass epoxy resin. One end of each wiring 23 is disposed on a surface 21a of the one side S of the bottom wall portion 21, and constitutes a terminal 24. The plurality of terminals 24 are arranged, for example, along the inner edge of the side wall portion 22 when viewed from the one side S. The other end of each wiring 23 is disposed on a surface 21b of the bottom wall portion 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 an external wiring (not shown).

[0025] 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 the one side S. The light receiving element 30 is, for example, a semiconductor light receiving element formed in a rectangular plate shape. The light receiving element 30 has a first light receiving portion 31, a second light receiving portion 32, a plurality of first terminals 33, and a second terminal 34. The first light receiving portion 31 and the second light receiving portion 32 are provided on the surface 30a of the one side S of the light receiving element 30 in a state separated from each other. That is, the light receiving element 30 is disposed on the bottom wall 21 so that the first light receiving surface 31a of the first light receiving portion 31 and the second light receiving surface 32a of the second light receiving portion 32 face the one side S. Each of the first light receiving portion 31 and the second light receiving portion 32 is, for example, a photodiode array, and each of the first light receiving surface 31a and the second light receiving surface 32a is, for example, formed in 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 made of a photodiode array. A plurality of first terminals 33 and a second terminal 34 are arranged on a 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. When viewed from one side S, the second terminal 34 is arranged between the first light receiving surface 31a and the second light receiving surface 32a.

[0026] The first FOP40 is an optical device formed by bundling a plurality of optical fibers, and is formed, for example, in a rectangular plate shape. The first FOP40 has a first input surface 40a formed by one end surface of the plurality of first optical fibers 41, and a first output surface 40b formed by the other end surface of the plurality of first optical fibers 41. Each of the first optical fibers 41 extends so as to be able to guide light from the first input surface 40a to the first output surface 40b. The first FOP40 is disposed on the light receiving element 30 so that the first output surface 40b faces the first light receiving surface 31a.

[0027] The second FOP50 is an optical device formed by bundling a plurality of optical fibers, and is formed, for example, in a rectangular plate shape. The second FOP50 has a second input surface 50a formed by one end surface of the plurality of second optical fibers 51, and a second output surface 50b formed by the other end surface of the plurality of second optical fibers 51. Each second optical fiber 51 extends so as to be capable of guiding light from the second input surface 50a to the second output surface 50b. The second FOP50 is disposed on the light receiving element 30 so that the second output surface 50b faces the second light receiving surface 32a.

[0028] The light emitting element 60 is mounted on the surface 30a of the light receiving element 30 so 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. In other words, the light emitting element 60 is disposed 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 the one side S.

[0029] In the first FOP 40, the multiple first optical fibers 41 are inclined so 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. In the second FOP 50, the multiple second optical fibers 51 are inclined 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. In this embodiment, the first FOP 40 and the second FOP 50 are each a slant fiber optic plate.

[0030] Among the multiple terminals 24 provided on the bottom wall portion 21 and the multiple first terminals 33 provided on the light receiving element 30, corresponding terminals 24 and first terminals 33 are connected to each other by a first wire 11. A second terminal 34 provided on the light receiving element 30 and a terminal 61 provided on the light emitting element 60 are connected to each other by a second wire 12. In the optical module 10A, electrical signals are input / output to / from the light receiving element 30 and the light emitting element 60 via multiple wirings 23.

[0031] The terminals 24, the first terminals 33, and the first wires 11 are covered by a first resin member 13 arranged 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 of 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 by 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 disposed on one side S of the second resin member 14.

[0032] Here, the positional relationship of each part on one side S will be described with reference to Fig. 3. The end face 22a of the side wall 22 on one side S is disposed closer to the one side S than the first light receiving surface 31a and the second light receiving surface 32a of the light receiving element 30. The end face 22a of the side wall 22 is disposed closer to the one side S than 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 disposed along the same plane P. The end face 22a of the side wall 22 is disposed closer to the one side S than the second wire 12. In addition, 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 that the first input surface 40a, the second input surface 50a, and the light-emitting surface 60a are arranged within a range of 0.1 mm on one side S of the plane P and a range of 0.1 mm on the opposite side, totaling a range of 0.2 mm, for example, the state in which the first input surface 40a, the second input surface 50a, and the light-emitting surface 60a are arranged on the same plane P.

[0033] As described above, in the optical module 10A, when light is emitted from the light emitting element 60 toward the light reflection pattern 5 of the rotating plate 3 included in the reflective encoder 1, the light reflected by the light reflection pattern 5 is incident on 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 multiple first optical fibers 41 and is incident on 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 multiple 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. As a result, the diffusion and attenuation of the light reflected by the light reflection pattern 5 and incident on the first light receiving surface 31a and the second light receiving surface 32a are suppressed 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 disposed on the light receiving element 30, the relative positions of the light emitting surface 60a of the light emitting element 60, the first light receiving surface 31a, and the second light receiving surface 32a are maintained with high accuracy. Moreover, since the light emitting element 60 is disposed between the first FOP 40 and the second FOP 50, the light emitting element 60 is protected from, for example, physical contact. Moreover, 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, for example, physical contact. 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 by the first resin member 13, the terminal 24 of the wiring 23, the first terminal 33 of the light receiving element 30, and the first wire 11 are protected from, for example, external force, oil that splashes when the reflective encoder 1 is used, and the like. As described above, according to this optical module 10A, good detection accuracy can be obtained when applied to the reflective encoder 1.

[0034] In the optical module 10A, in the first FOP 40, the plurality of first optical fibers 41 are inclined so 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 the one side S, and in the second FOP 50, the plurality of second optical fibers 51 are inclined 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 the one side S. This shortens the optical path length of the light emitted from the light-emitting element 60 to the first input surface 40a and the optical path length of the light emitted from the light-emitting element 60 to the second input surface 50a, so that 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 can be further suppressed.

[0035] In the optical module 10A, the end face 22a is disposed on one side S of the first resin member 13, and therefore, it is possible to protect the first resin member 13 and, in turn, the first wire 11 from, for example, physical contact. Also, 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.

[0036] In addition, 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, thereby improving the bonding strength of the light emitting element 60 to the light receiving element 30.

[0037] Furthermore, 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. With this, even if the position of the optical module 10A with respect to the light reflection pattern 5 of the rotating plate 3 included in the reflective encoder 1 is slightly shifted, for example, it is possible to suppress distortion of the light patterns incident on each of the first input surface 40a and the second input surface 50a due to the position shift, thereby obtaining better detection accuracy.

[0038] Moreover, 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 face 22a is disposed on one side S of the second wire 12. When the first input surface 40a, the second input surface 50a, and the light emitting surface 60a of the light emitting element 60 are disposed along the same plane P, the second wire 12 may protrude to the one side S of the plane P. Even in such a case, the second wire 12 can be protected from, for example, physical contact. [Second embodiment]

[0039] 4, the optical module 10B differs from the above-described optical module 10A 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 disposed on the one side S of the second wire 12, and are disposed on the one side S of the end surface 22a of the side wall portion 22. The end surface 22a of the side wall portion 22 is disposed on the 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 the one side S of the second wire 12.

[0040] According to the optical module 10B, for the same reasons as those of the optical module 10A described above, when applied to the reflective encoder 1, good detection accuracy can be obtained.

[0041] Furthermore, 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 positioned on one side S of the second wire 12, thereby protecting the second wire 12 from, for example, physical contact.

[0042] 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 disposed on one side S of the second wire 12 and on one side S of the end surface 22a of the side wall portion 22, so that the first input surface 40a and the second input surface 50a can be brought closer to the light reflecting pattern 5. Therefore, the optical path length of the light emitted from the light emitting element 60 to the first input surface 40a and the optical path length of the light emitted from the light emitting element 60 to the second input surface 50a are shortened, so that 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 can be further suppressed. [Variations]

[0043] The present invention is not limited to the first and second embodiments described above. For example, the materials and shapes of each component are not limited to those described above, and various materials and shapes can be adopted.

[0044] The wiring 23 may be any wiring provided on the bottom wall portion 21. The wiring 23 is not limited to wiring directly formed on the bottom wall portion 21, and may be, for example, wiring provided on a wiring board arranged on the bottom wall portion 21. In the first FOP 40, a plurality of first optical fibers 41 may be provided 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. In the second FOP 50, a plurality of second optical fibers 51 may be provided 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. [Explanation of symbols]

[0045] 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, 20...support, 21...bottom wall portion, 22...side wall portion, 22a...end face, 23...wiring, 24...terminal, 30...light receiving element, 31a...first light receiving surface, 32a...second light receiving surface, 33...first 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 optic 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

1. 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; a fiber optic plate having an input surface formed by one end surfaces of a plurality of optical fibers and an output surface formed by the other end surfaces of the plurality of optical fibers, the fiber optic plate being disposed on the light receiving element such that the output surface faces the light receiving surface; a light emitting element disposed on the light receiving element together with the fiber optic plate, Optical module.

2. 2. The optical module according to claim 1, wherein in the fiber optic plate, the plurality of optical fibers are inclined so 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.

3. a first wire connecting a terminal of the wiring and a first terminal of the light receiving element; a first resin member covering the terminal of the wiring, the first terminal of the light receiving element, and the first wire; The optical module according to claim 1 , further comprising:

4. The optical module according to claim 3 , wherein the first resin member is in contact with a side surface of the fiber optic plate above the light receiving element.

5. a second resin member that fixes the fiber optic plate to the light receiving element; 5. 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.

6. 6. The optical module according to claim 1, wherein the input surface and the light emitting surface of the light emitting element are arranged along the same plane.

7. The optical module according to claim 6 , further comprising a second wire connecting a second terminal of the light receiving element and a terminal of the light emitting element.

8. a second wire connecting a second terminal of the light receiving element and a terminal of the light emitting element; 6. The optical module according to claim 1, wherein the input surface is disposed on the one side of the second wire.

9. A rotating plate having a light reflecting pattern; An optical module according to any one of claims 1 to 8; A reflective encoder comprising:

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