JP2006147713A - Optically coupled device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce power in an optically coupled device in a form for receiving light from a light-emitting element at two light reception sections. <P>SOLUTION: In the optically coupled device, the light-emitting element 11 and a light receiving element 12 that is arranged opposite to the light-receiving element 11 optically and has first and second light reception sections are molded by a transparent resin 16 integrally, and then light generated by the light-emitting element 11 is received by the first and second light reception sections of the light receiving element 12. A spectroscopic body 20 having a different refractive index from that of the transparent resin 16 is arranged between the light-emitting element 11 and the light receiving element 12, and the boundary surface between the transparent resin 16 and the spectroscopic body 20 is formed in a shape for guiding light from the light-emitting element 11 to the first and second light reception sections, thus reducing the power of the optocoupler. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical coupling element, and more particularly to an optical coupling element in which light emitted from a light emitting element is received by first and second light receiving portions.

  The conventional optical coupling element 101 has a structure in which a light emitting element 111 and a light receiving element 112 are paired and accommodated in the same package. The internal structure will be described below with reference to FIG.

  The light emitting element 111 is die-bonded to the lead frame 113a with silver paste, and the surface electrode of the light emitting element 111 is electrically connected to the lead frame 113c with a bonding wire 114. The light emitting element 111 is coated with a transparent silicon resin 115. This is for preventing output deterioration of the light emitting element 111.

  The light receiving element 112 is die-bonded to the lead frame 113b with silver paste, and the surface electrode of the light receiving element 112 is electrically connected to the lead frame 113d with a bonding wire 114.

  The light emitting element 111 and the light receiving element 112 are covered with a transparent resin 116 so that light is transmitted. Further, the entire portion covered with the transparent resin 116 is molded with a light shielding resin 117 to constitute the optical coupling element 101.

  In addition, with the recent energy saving of electronic devices, the power of the optical coupling element is reduced. In such a situation, as shown in Japanese Utility Model Publication No. 64-13161, the light transmission efficiency is improved by fixing the periphery of the high light transmittance material mounted on the light receiving portion with a transparent resin containing a white pigment. There has been proposed an optical coupling element that achieves the above.

This prior art mounts a high light transmittance material on the light receiving part, and reduces the rate at which the light from the light emitting element is absorbed by the transparent resin, thereby increasing the amount of light reaching the light receiving part, The side of this high light transmittance material is covered with a transparent resin containing a white pigment to reflect light leaking from the side to the outside, thereby increasing the amount of light incident on the light receiving unit, thereby improving the light transmission efficiency. .
Japanese Utility Model Publication No. 64-13161

  By the way, as shown in FIG. 10, in the structure in which the light receiving element 112 has two light receiving portions 131a and 131b, the non-light receiving region 130 having no light receiving sensitivity between the light receiving portions 131a and 131b is irradiated. The light is reflected, resulting in light loss, and the light transmission efficiency is low.

  In particular, when the central axis of the light emitting element 111 is arranged in the middle of the two light receiving portions 131a and 131b so that the outputs based on the two light receiving portions 131a and 131b are equal, the optical loss is reduced. Is big. This is because the light intensity is relatively strong around the central axis of the light emitting element 111, so that the amount of light reflected in the non-light receiving region 130 between the two light receiving portions increases, and the light loss increases accordingly. .

  Even if the structure shown in Patent Document 1 is used, the light leaking from the side surface of the high light transmittance material can be reflected to increase the light incident on the light receiving unit. Since the light irradiated to the non-light-receiving area in the meantime is reflected, this amount of light is lost, and the light transmission efficiency is lowered.

  The present invention has been made in view of these points, and an object of the present invention is to provide an optical coupling element in which light transmission efficiency is improved and power is further reduced in an optical coupling element having a plurality of light receiving portions. is there.

  In order to solve the above-mentioned problems, an optical coupling element of the present invention is a transparent light-emitting element and a light-receiving element having first and second light-receiving portions disposed optically opposite to the light-emitting element. In the optical coupling element which is molded with resin and configured to receive light emitted from the light emitting element by the first and second light receiving portions of the light receiving element, a spectral body having a refractive index different from that of the transparent resin is provided. A shape that is disposed between the light emitting element and the light receiving element, and a boundary surface between the transparent resin and the spectroscopic material guides light from the light emitting element to the first and second light receiving portions. It is characterized by being formed.

  With such a configuration, the light from the light emitting element can be refracted at the boundary surface between the transparent resin and the spectroscopic material and guided to the first and second light receiving portions. As a result, in the conventional optical coupling element, the light that has not been used effectively by irradiating the non-light receiving region between the first and second light receiving units is guided to the first and second light receiving units. Therefore, the light transmission efficiency can be improved accordingly.

  In the present invention, the spectroscopic body is made of a material having a refractive index higher than that of the transparent resin, and the boundary surface between the transparent resin and the spectroscopic body has first and second two shapes that are V-shaped. You may comprise from a slope.

  When the refractive index of the spectral body is higher than the refractive index of the transparent resin, the light emission angle becomes smaller than the incident angle of the light incident on the spectral body. From this, by constructing the boundary portion between the transparent resin and the spectroscopic body from the first and second inclined surfaces having a V shape, the light incident on the two inclined surfaces is changed into the first and second surfaces. The light can be guided to the light receiving unit. As a result, if the aforementioned boundary surface is not present, the light irradiated to the non-light-receiving region between the first and second light-receiving parts can be guided to the light-receiving part. Can be improved.

  In the present invention, the spectroscopic material is made of a material having a lower refractive index than the transparent resin, and the boundary surface between the transparent resin and the spectroscopic material has first and second two shapes having an inverted V shape. It may consist of two slopes.

  When the refractive index of the spectral body is lower than the refractive index of the transparent resin, the emission angle of the light becomes larger than the incident angle of the light incident on the spectral body. From this, by constructing the boundary portion between the transparent resin and the spectroscopic body from the first and second inclined surfaces having an inverted V shape, the light incident on the two inclined surfaces is changed to the first and second surfaces. The light can be guided to the light receiving part. As a result, if the aforementioned boundary surface is not present, the light irradiated to the non-light-receiving region between the first and second light-receiving parts can be guided to the light-receiving part. Can be improved.

  Further, in the present invention, at least one of the two slopes described above causes the light of the light emitting element incident perpendicularly to the plane including the light receiving portion at the abutting portion of the two slopes to the slope. It is preferable to incline so that it may guide to the inner edge of the said corresponding light-receiving part.

  By inclining the inclined surfaces in this way, the light incident on the two inclined surfaces in the direction perpendicular to the surface including the light receiving surface can be completely guided to the light receiving unit. That is, the light incident on the abutting portion of the inclined surface that is farthest from each light receiving portion is guided to the edge of each light receiving portion, so that it enters the region closer to the light receiving portion than the abutting portion. The light is guided to the inner side of the light receiving unit with respect to the edge of the corresponding light receiving unit, whereby the light incident perpendicular to the surface including the light receiving unit is completely transferred to the light receiving unit. It can be guided. Therefore, the light transmission efficiency can be further improved accordingly.

  In the present invention, the spectroscopic material may be glass.

  In the present invention, an antireflection film may be applied to the boundary surface.

  By doing so, it is possible to reduce the amount of light reflected at the boundary surface and increase the amount of light incident on the spectroscopic body, so that the light transmission efficiency can be further improved accordingly.

  According to the present invention, in the optical coupling element characterized in that the light emitted from the light emitting element is received by the first and second light receiving parts, the non-light receiving region between the first and second light receiving parts is irradiated. In addition, since light that has not been effectively utilized can be guided to the light receiving unit by the spectroscopic material, the light transmission efficiency of the optical coupling element can be improved and the power can be reduced.

  Embodiments of the present invention will be described below with reference to the drawings.

  The form of Example 1 is demonstrated with reference to FIG. 1 thru | or FIG.

  FIG. 1 is a cross-sectional view of the optical coupling element of the first embodiment. FIG. 2 is a diagram illustrating a path of light incident on the spectroscopic body. FIG. 3 is a diagram showing the relationship between the angle of the inclined surface of the V-shaped groove and the incident light. FIG. 4 is a view showing another example of the spectroscopic body. FIG. 5 is a diagram showing still another example of the spectral body.

  As shown in FIG. 1, the optical coupling element 1 shown in the present embodiment is configured such that a light emitting element 11 and a light receiving element 12 on which a spectroscopic body 20 is disposed are optically opposed to each other as a pair. The element 11, the light receiving element 12, and the spectral body 20 are integrally molded with a transparent resin 16, and further molded with a light shielding resin 17 so as to cover the entire transparent resin 16. Hereinafter, each main part will be described in detail.

  The light emitting element 11 is die-bonded to the lead frame 13a with silver paste, and the surface electrode of the light emitting element 11 is electrically connected to the lead frame 13c (hidden in the lead frame 13a in FIG. 1) with a bonding wire 14. The light emitting element 11 is coated with a transparent silicon resin 15. This is for preventing output deterioration of the light emitting element 11.

  The light receiving element 12 is provided with two light receiving portions 31a and 31b that receive light from the light emitting element 11 with a certain interval. A region between the light receiving parts 31a and 31b is a non-light receiving region 30 having no light receiving sensitivity.

  The light receiving element 12 is die-bonded to the other lead frame 13b with silver paste, and the surface electrode of the light receiving element 12 is electrically connected to the lead frame 13d (hidden in the lead frame 13b in FIG. 1) by a bonding wire 14. It is connected to the. The light receiving element 12 is disposed so as to face the light emitting element 11 so as to receive light from the light emitting element 11.

  The spectral body 20 is disposed so as to cover the two light receiving portions 31a and 31b, and is fixed with a transparent adhesive. The spectroscopic body 20 is made of glass. The glass is made of a material that transmits light emitted from the light emitting element 11 and has a refractive index n2 higher than the refractive index n1 of the transparent resin 16 that covers the spectroscopic body 20. Yes. The spectroscopic body 20 may be formed of a transparent plastic resin or the like as long as it has the same characteristics as such glass.

  As shown in FIG. 2, the spectroscopic body 20 has a V-shape in a region corresponding to the non-light receiving region 30 between the first light receiving unit 31 a and the second light receiving unit 31 b on the boundary surface with the transparent resin 16. The V-shaped groove | channel 21 comprised from the 1st, 2nd two slope which exhibits is formed. The first inclined surface 22a is inclined toward the first light receiving portion 31a, and the second inclined surface 22b is inclined toward the second light receiving portion 31b.

  Next, the operation of the spectral body 20 will be described in detail.

  Since the spectroscopic body 20 is made of glass having a refractive index n2 higher than the refractive index n1 of the transparent resin 16, the light Lgt1 incident on the V-shaped groove 21 is emitted at an emission angle smaller than the incident angle. Therefore, the light incident on the first inclined surface of the V-shaped groove 21 is refracted in the direction of the first light receiving portion 31a, while the light incident on the second inclined surface of the V-shaped groove 21 is incident on the second light receiving portion 31b. Refracts in the direction. Therefore, as shown in FIG. 2, if there is no V-shaped groove 21, the light that travels straight and irradiates the non-light-receiving region 30 between the two light receiving portions 31 a and 31 b is reflected in the V-shaped groove 21. The light is refracted and guided to the light receiving portions 31a and 31b, so that the light transmission efficiency is improved accordingly.

  Furthermore, the optimum inclination angle of the slope of the V-shaped groove 21 will be described here with reference to FIG.

  In order to improve the light transmission efficiency most, the strongest light among the light incident on the non-light receiving region 30 between the two light receiving portions 31a and 31b is completely guided to the two light receiving portions 31a and 31b. I just want to be able to do it.

  Here, among the light incident on the non-light-receiving region 30 between the two light-receiving portions 31a and 31b, the strongest light is light that is perpendicularly incident on this region. In order to completely guide the vertically incident light to the two light receiving portions 31a and 31b, as shown in FIG. 3, the light enters the abutting portion 50 where the inclined surface of the V-shaped groove 21 abuts. The first inclined surface 22a and the second inclined surface 22b may be inclined so that the light Lgt3 to be transmitted is guided to the edges 61a and 61b of the light receiving units corresponding to the light receiving units 31a and 31b.

  As a result, in the V-shaped groove 21, the light incident on the region closer to the light receiving portions 31 a and 31 b from the abutting portion 50 of the V-shaped groove 21 is received from the corresponding edges of the light receiving portions 61 a and 61 b. Thus, the light incident on the V-shaped groove 21 can be completely guided to the light receiving portions 31a and 31b.

  Next, how to obtain the inclination angles of the first slope 22a and the second slope 22b will be described with reference to FIG.

  The path of light Lgt3 that is incident perpendicular to the surface including the light receiving portions 31a and 31b and that is incident on the abutting portion 50 where the inclined surface of the V-shaped groove 21 abuts is indicated by an arrow in FIG. . The positional relationship between the emission angle of the emitted light Lgt4, the position of the abutting portion 50 where the two inclined surfaces 22a and 22b of the V-shaped groove 21 abut, and the edge 61a of the light receiving portion is as follows. .

That is, the incident light Lgt3 (light incident perpendicularly to the surface including the light receiving portions 31a and 31b and incident on the abutting portion 50 where the inclined surface of the V-shaped groove 21 abuts) and the emitted light The angle formed with Lgt4 is θa, the distance from the surface including the light receiving portions 31a and 31b to the abutting portion 50 where the two inclined surfaces of the V-shaped groove 21 abut each other is L1, and the inner edge 61a of the first light receiving portion If the distance to the abutting part 50 is L2,
θa = cos ⁻¹ (L1 / L2) Equation (1)
The relationship holds.

  On the other hand, if the incident angle with respect to the inclined surface of the V-shaped groove 21 is θ1, and the angle refracted by the inclined surface is θ2, n1sin θ1 = n2sin θ2 holds according to Snell's law. Further, since the opposing angles are equal, θ1 = θ2 + θa holds. Further, θA + θ1 = 90 °, where θA is an angle formed by the slope of the V-shaped groove 21 and a line extending perpendicularly to the surface including the light receiving portions 31a and 31b. From these equations, θA can be expressed as n1, n2, and θa by eliminating θ2 and solving the equation for θ1.

  Therefore, since θa is derived from L1 and L2 from the above equation (1), the optimum inclination angle θA of the inclined surface of the V-shaped groove 21 is the refractive index n1 of the transparent resin 16 covering the spectral body 20, the spectral body 20 with a refractive index n2, a distance L1 from the surface including the light receiving portions 31a and 31b to the abutting portion 50 where the two inclined surfaces of the V-shaped groove 21 abut, and the inner edge 61a of the first light receiving portion If the distance L2 to the part 50 is determined, it is obtained.

  Since the light intensity of the light emitting element 11 is the strongest near the optical axis, the optical axis of the light emitting element 11 passes through the abutting portion 50 of the V-shaped groove 21 of the spectroscopic body 20 and receives the light receiving portion 31a. , 31b is preferably arranged so as to be perpendicular to the surface including the optical coupling efficiency, so that the optical coupling efficiency can be further improved.

  In the first embodiment, the V-shaped groove 21 is described as an example of the specific shape of the boundary surface between the transparent resin and the spectroscopic body 20 that guides the light emitted from the light emitting element 11 to the light receiving unit. However, it goes without saying that such a shape is not necessary. For example, as shown in FIG. 4, the boundary surface between the transparent resin 16 and the spectroscopic body 23 is formed in a shape having a plurality of substantially V-shaped grooves. Since light incident on the non-light receiving region 30 between the first light receiving portion 31a and the second light receiving portion 31b can be guided to the light receiving portions 31a and 31b, the light transmission efficiency can be improved. Moreover, the shape of the boundary surface between the transparent resin and the spectroscopic material may be a shape that guides the light from the light emitting element 11 to the light receiving portions 31a and 31b. Also good.

  Further, in the first embodiment, the spectroscopic body is large enough to cover the two light receiving units, but the spectroscopic body may not be such a size. For example, as shown in FIG. 5, even if the size is such that it covers only the non-light-receiving region 30 between the first light-receiving unit 31a and the second light-receiving unit 32b, By adopting an appropriate shape, the light incident on the non-light receiving region 30 between the first light receiving unit 31a and the second light receiving unit 31b is guided to the light receiving units 31a and 31b in the same manner as described above. Light transmission efficiency can be improved.

  Further, an antireflection film may be formed on the boundary surface between the spectral body 20 and the transparent resin 16 covering the spectral body 20. As a result, surface reflection of light incident on the spectroscopic material can be prevented, and the light transmission efficiency can be further improved.

  The form of Example 2 is demonstrated with reference to FIG. 6 thru | or FIG.

  FIG. 6 is a cross-sectional view of the optical coupling element of the second embodiment. FIG. 7 is a diagram illustrating a path of light incident on the spectroscopic body. FIG. 8 is a diagram showing the relationship between the angle of the inclined surface of the inverted V-shaped groove and the incident light.

  In the optical coupling element 2 shown in this embodiment, as shown in FIG. 6, a pair of a light emitting element 11 and a light receiving element 12 provided with a spectroscopic body 27 are optically arranged to face each other. The element 11, the light receiving element 12, and the spectral body 27 are integrally molded with the transparent resin 16 and further molded with the light shielding resin 17 so as to cover the entire transparent resin 16. Hereinafter, each main part will be described in detail.

  The light emitting element 11 is die-bonded to the lead frame 13a with silver paste, and the surface electrode of the light emitting element 11 is electrically connected to the lead frame 13c (hidden in the lead frame 13a in FIG. 6) with a bonding wire 14. The light emitting element 11 is coated with a transparent silicon resin 15. This is for preventing output deterioration of the light emitting element 11.

  The light receiving element 12 is provided with two light receiving portions 31a and 31b that receive light from the light emitting element 11 with a certain interval. A region between the light receiving parts 31a and 31b is a non-light receiving region 30 having no light receiving sensitivity.

  The light receiving element 12 is die-bonded to the other lead frame 13b with silver paste, and the surface electrode of the light receiving element 12 is electrically connected to the lead frame 13d (hidden in the lead frame 13b in FIG. 6) by a bonding wire 14. It is connected to the. The light receiving element 12 is disposed so as to face the light emitting element 11 so as to receive light from the light emitting element 11.

  The spectroscopic body 27 is disposed so as to cover the two light receiving portions 31a and 31b, and is fixed with a transparent adhesive. The spectroscopic body 27 is made of glass, and this glass is made of a material that transmits light emitted from the light emitting element 11 and has a refractive index n20 lower than the refractive index n10 of the transparent resin 16 that covers the spectroscopic body 27. Yes. The spectral body 27 may be formed of a transparent plastic resin or the like as long as it has the same characteristics as such glass.

  As shown in FIG. 7, the spectroscopic body 27 has an inverted V shape in a region corresponding to the non-light-receiving region 30 between the first light receiving unit 31 a and the second light receiving unit 31 b on the boundary surface with the transparent resin 16. An inverted V-shaped projection 28 composed of first and second inclined surfaces having a shape is formed. The first inclined surface 29a is inclined toward the first light receiving unit 31a, and the second inclined surface 29b is inclined toward the second light receiving unit 31b.

  Next, the operation of the spectral body 27 will be described in detail.

  Since the spectral body 27 is made of glass having a refractive index n20 lower than the refractive index n10 of the transparent resin 16, the light Lgt1 incident on the inverted V-shaped projection 28 is emitted at an emission angle larger than the incident angle. Therefore, the light incident on the first inclined surface of the inverted V-shaped protrusion 28 is refracted in the direction of the first light receiving portion 31a, while the light incident on the second inclined surface of the inverted V-shaped protrusion 28 is reflected on the second light receiving portion. It is refracted in the direction of 31b. Therefore, as shown in FIG. 7, if there is no inverted V-shaped projection 28, the light traveling straight and irradiating the non-light receiving region 30 between the two light receiving portions 31a and 31b is inverted V-shaped. Since the light is refracted at the protrusion 28 and guided to the light receiving portions 31a and 31b, the light transmission efficiency is improved accordingly.

  Further, the optimum inclination angle of the inclined surface of the inverted V-shaped projection 28 will be described with reference to FIG.

  In order to improve the light transmission efficiency most, the strongest light among the light incident on the non-light receiving region 30 between the two light receiving portions 31a and 31b is completely guided to the two light receiving portions 31a and 31b. I can do it.

  Here, among the light incident on the non-light-receiving region 30 between the two light-receiving portions 31a and 31b, the strongest light is light that is perpendicularly incident on this region. In order to guide the perpendicularly incident light to the two light receiving portions 31a and 31b completely, as shown in FIG. 8, the contact portion 51 where the inclined surface of the inverted V-shaped projection 28 abuts is used. What is necessary is just to incline the 1st slope 29a and the 2nd slope 29b so that incident light Lgt3 may be guided to the edge 61a, 61b of the light-receiving part corresponding to each light-receiving part 31a, 31b.

  Thereby, in the inverted V-shaped projection 28, the light incident on the region closer to the light receiving portions 31a and 31b than the abutting portion 51 of the inverted V-shaped projection 28 is transmitted from the edges 61a and 61b of the corresponding light receiving portions. Since the light is irradiated on the inner side of the light receiving portion, the light incident on the inverted V-shaped projection 28 can be completely guided to the light receiving portions 31a and 31b.

  Next, how to obtain the inclination angles of the first slope 29a and the second slope 29b will be described with reference to FIG.

The path of light Lgt3 that is incident on the surface including the light receiving portions 31a and 31b perpendicularly to the abutting portion 51 where the inclined surface of the inverted V-shaped projection 28 abuts is indicated by an arrow in FIG. Show. The positional relationship between the emission angle of the emitted light Lgt4, the position of the abutting portion 51 where the two inclined surfaces 29a and 29b of the inverted V-shaped projection 28 abut, and the edge 61a of the light receiving portion is as follows. Become. That is, the incident light Lgt3 (light incident perpendicularly to the surface including the light receiving portions 31a and 31b and incident on the abutting portion 51 where the inclined surface of the inverted V-shaped projection 28 abuts) is emitted. The angle formed by the incident light Lgt4 is θb, the distance from the surface including the light receiving portions 31a and 31b to the abutting portion 51 where the two inclined surfaces of the inverted V-shaped projection 28 abut each other is L10, and the inner edge of the first light receiving portion If the distance between 61a and the abutting part 51 is L20,
θb = cos ⁻¹ (L10 / L20) Equation (2)
The relationship holds.

  On the other hand, if the angle of incidence on the inclined surface of the inverted V-shaped projection is θ10 and the angle of refracted and emitted by the inclined surface is θ20, n10sinθ10 = n20sinθ20 is established according to Snell's law. Further, since the opposing angles are equal, θ10 = θ20−θb is established. In addition, θB−θ10 = 90 °, where θB is an angle formed between the inclined surface of the inverted V-shaped protrusion and a line extending perpendicularly to the light receiving portion. From these equations, θB can be expressed as n10, n20, and θb by eliminating θ20 and solving the equation for θ10.

  Therefore, since θb is derived from L10 and L20 from the above equation (2), the optimum inclination angle θB of the inclined surface of the inverted V-shaped projection is the refractive index n10 of the transparent body covering the spectral body, the refractive index of the spectral body A ratio n20, a distance L10 from the surface of the light receiving element 12 to the abutting portion 51 of the inclined surface of the inverted V-shaped projection of the spectral body, and a distance from the intermediate point between the first light receiving portion and the second light receiving portion to the edge of the light receiving portion. If L20 is determined, it will be obtained.

1 is a cross-sectional view of an optical coupling element in a first embodiment of the present invention. It is the figure which showed the path | route of the light which injects into the spectral body in the 1st Example of this invention. It is the figure which showed the relationship between the angle of the slope of a V-shaped groove | channel in 1st Example of this invention, and incident light. It is the figure which showed the other example of the spectroscopic body. It is the figure which showed the further another example of the spectroscopic body. It is optical coupling element sectional drawing in the 2nd Example of this invention. It is the figure which showed the path | route of the light which injects into the spectral body in the 2nd Example of this invention. It is the figure which showed the relationship between the angle of the inclined surface of the inverted V-shaped protrusion in the 2nd Example of this invention, and incident light. It is sectional drawing of the optical coupling element in conventional embodiment. It is the figure which showed the incident light to the light receiving element in conventional embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical coupling element 11 Light emitting element 12 Light receiving element 13a Lead frame 13b Lead frame 13c Lead frame 13d Lead frame 14 Bonding wire 15 Transparent silicon resin 16 Transparent resin 17 Light shielding resin 20 Spectrometer

Claims (6)

A light-emitting element and a light-receiving element having first and second light-receiving portions disposed optically opposite to the light-emitting element are integrally molded with a transparent resin, and the light emitted from the light-emitting element is In the optical coupling element configured to receive light at the first and second light receiving portions of the light receiving element,
A spectral body having a refractive index different from that of the transparent resin is disposed between the light emitting element and the light receiving element, and a boundary surface between the transparent resin and the spectral body transmits light from the light emitting element. And the optical coupling element characterized by being formed in the shape guided to the 2nd light-receiving part.   The spectroscopic body is made of a material having a higher refractive index than the transparent resin, and the boundary surface between the transparent resin and the spectroscopic body is composed of first and second inclined surfaces having a V shape. The optical coupling element according to claim 1.   The spectroscopic body is made of a material having a lower refractive index than the transparent resin, and the boundary surface between the transparent resin and the spectroscopic body is composed of first and second inclined surfaces having an inverted V shape. The optical coupling element according to claim 1.   At least one of the two inclined surfaces has a light incident on the light-emitting element incident perpendicularly to a plane including the light receiving unit at an abutting portion between the two inclined surfaces, and the inside of the light receiving unit corresponding to the inclined surface. The optical coupling element according to claim 2, wherein the optical coupling element is inclined so as to be guided to the end edge.   The optical coupling element according to claim 1, wherein the spectroscopic material is glass. The optical coupling element according to claim 1, wherein an antireflection film is applied to the boundary surface.

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