JP2017028161A - Optical coupling device - Google Patents

Abstract

An optical coupling device that can be thinned without using an expensive member is provided. An optical coupling device is disposed in a direction intersecting the thickness direction of a light emitting element, and covers a periphery of the light emitting element and the light receiving element. Between the transparent first resin part that guides the optical signal from the light emitting element to the light receiving element, the opaque second resin part that covers the surface of the first resin part, and the first resin part and the second resin part And a reflective film that reflects an optical signal from the light emitting element. [Selection] Figure 1

Description

  Embodiments described herein relate generally to an optical coupling device.

  The optical coupling device receives an optical signal emitted by the light emitting element by the light receiving element. In the optical coupling device, the light emitting element and the light receiving element are arranged to face each other, and the package becomes thick. Therefore, a reflection type optical coupling device in which a light emitting element and a light receiving element are arranged side by side has been proposed. In the reflection type optical coupling device, the periphery of the light emitting element and the light receiving element is covered with a transparent resin portion, and the transparent resin portion is further covered with a white resin portion. The optical signal from the light emitting element is reflected by the white resin portion and received by the light receiving element.

  Since the white resin has a higher member cost than the black resin which is a normal packaging member, it is desirable to use the black resin from the viewpoint of reducing the member cost. However, when the black resin is used, the external light of the optical coupling device is also absorbed, and part of the absorbed external light is transmitted through the black resin portion and received by the light receiving element, thereby increasing noise. In order to reduce noise, the black resin portion must be thickened, which hinders downsizing of the optical coupling device.

JP-A-11-163391

  The present embodiment provides an optical coupling device that can be miniaturized.

According to the present embodiment, a light emitting element that emits an optical signal;
A light receiving element that is disposed in a direction intersecting the thickness direction of the light emitting element and receives the optical signal;
A transparent first resin portion that covers the periphery of the light emitting element and the light receiving element and guides an optical signal from the light emitting element to the light receiving element;
An opaque second resin portion covering the surface of the first resin portion;
There is provided an optical coupling device including a reflective film that is disposed between the first resin portion and the second resin portion and reflects the optical signal from the light emitting element.

Sectional drawing of the reflection type optical coupling device by 1st Embodiment. Sectional drawing which shows an example of the cross-sectional structure of a light emitting element. Sectional drawing of the reflection type optical coupling device which shows one comparative example. Sectional drawing of the reflection type optical coupling device which shows the 1st modification of FIG. Sectional drawing of the light emitting element used in the 1st modification. Sectional drawing of the reflection type optical coupling device 1 which shows a 2nd modification. Sectional drawing of the reflection type optical coupling device 1 which shows a 3rd modification. Sectional drawing of the optical coupling device which shows 2nd Embodiment. Sectional drawing of the optical coupling device which shows the modification of the optical coupling device which is 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a sectional view of a reflection type optical coupling device 1 according to the first embodiment. 1 includes a first lead frame (first support plate) 2 and a second lead frame (second support plate) 3, a light emitting element 4, a light receiving element 5, and a first resin portion 6. The second resin portion 7 and the reflective film 8 are provided.

  The light emitting element 4 emits an optical signal. The light receiving element 5 receives an optical signal from the light emitting element 4. The light receiving element 5 is arranged in a direction y that intersects the thickness direction x of the light emitting element 4. The light emitting element 4 is placed on the first lead frame 2. The light receiving element 5 is placed on the second lead frame 3. Both the first lead frame 2 and the second lead frame 3 extend in the y direction. The first lead frame 2 and the second lead frame 3 are arranged apart from each other in the y direction. The light extraction portion of the light emitting element 4 is provided on the upper surface or side surface of the light emitting element 4. The light receiving portion 5 a of the light receiving element 5 is provided on the upper surface of the light receiving element 5. In the present specification, a surface of the first lead frame 2 and the second lead frame 3 opposite to the bonding surface of the light emitting element 4 and the light receiving element 5 is referred to as a back surface.

  FIG. 2 is a cross-sectional view illustrating an example of a cross-sectional structure of the light-emitting element 4. In the light-emitting element 4 of FIG. 2, an n-type current diffusion layer 12, an n-type cladding layer 13, an active layer 14, a p-type cladding layer 15, a p-type current diffusion layer 16 and a light-transmitting substrate 11 such as sapphire A p-type electrode 17 is sequentially stacked. An n-type electrode 18 is disposed on the back side of the translucent substrate 11. The n-type electrode 18 is a reflective electrode, and reflects light transmitted through the translucent substrate 11 from the active layer 14 upward. If the p-type electrode 17 is a transparent electrode, light can be extracted from the light extraction portion 4a on the upper surface. If the p-type electrode 17 is disposed on the entire top surface of the p-type current diffusion layer 16 to form a reflective electrode, light can be extracted from the light extraction portion 4 a on the side surface of the active layer 14. Although omitted in FIG. 2, other layers such as a buffer layer may be provided around the p-type cladding layer 15 and the n-type cladding layer 13, and the cross-sectional structure of the light-emitting element 4 according to the present embodiment is as follows. The invention is not limited to that shown in FIG.

The first resin portion 6 in FIG. 1 covers the periphery of the light emitting element 4 and the light receiving element 5 and functions as a light guiding portion that guides an optical signal from the light emitting element 4 to the light receiving element 5. The first resin portion 6 is a transparent member having transparency with respect to the emission wavelength of the optical signal emitted from the light emitting element 4. The first resin portion 6 is, for example, transparent rubbery silicone. The second resin part 7 covers the surface of the first resin part 6. The 2nd resin part 7 is an opaque member which does not have the transparency with respect to the light emission wavelength of the optical signal which the light emitting element 4 light-emits. The second resin portion 7 is made of, for example, an epoxy resin. The second resin portion 7 is a black in which black carbon having light shielding properties, SiC, TiO ₂ or the like is mixed in an epoxy resin so that light from the outside of the optical coupling device 1 does not enter the first resin portion 6. It is a resin part.

  As the black resin used for the second resin portion 7, those generally used as a package member can be used. As described above, when a black resin is used as the second resin portion 7, a part of the external light may pass through the black resin, but in this embodiment, the light transmitted through the second resin portion 7 made of the black resin. Can be shielded by the reflective film 8, so that the light receiving element 5 is less susceptible to noise light such as external light. In addition, although member cost may become higher than black resin, you may comprise the 2nd resin part 7 with white resin. Below, the example which comprises the 2nd resin part 7 with black resin is demonstrated.

  The reflective film 8 is disposed at the boundary between the first resin portion 6 and the second resin portion 7 and reflects the optical signal emitted from the light emitting element 4. The optical signal reflected by the reflective film 8 is received by the light receiving element 5. The surface of the reflective film 8 is preferably a mirror surface. By making the surface of the reflective film 8 a mirror surface, the optical signal incident on the reflective film 8 can be reflected in a direction corresponding to the incident direction, and the amount of the optical signal received by the light receiving element 5 can be increased. it can. Further, as described above, the reflective film 8 can also be used for the purpose of shielding the external light transmitted through the second resin portion 7.

  The reflective film 8 of FIG. 1 is disposed on the upper side of the light emitting element 4 disposed on the first lead frame 2 and on the upper side of the light receiving element 5 disposed on the second lead frame 3. Thereby, the reflective film 8 and the light receiving portion 5a of the light receiving element 5 are arranged to face each other. Therefore, most of the optical signal emitted from the light extraction portion 4 a provided on the upper surface or the side surface of the light emitting element 4 is reflected by the reflective film 8 and then enters the light receiving portion 5 a provided on the upper surface of the light receiving element 5. The

The optical coupling device 1 performs signal transmission while maintaining an electrical insulation state, and it is necessary to comply with a safety standard that the light emitting element 4 and the light receiving element 5 are separated by 0.4 mm or more. With this safety standard in mind, it is not desirable to form the reflective film 8 with a conductive material. Even if the light emitting element 4 and the light receiving element 5 are separated by 0.4 mm or more, if a conductive film exists between the light emitting element 4 and the light receiving element 5, the insulation distance between the light emitting element 4 and the light receiving element 5 becomes short. is there. Therefore, in this embodiment, the reflective film 8 is an insulator. As a specific example of the reflection film 8, for example, a single-layer dielectric film containing a metal oxide such as Al ₂ O ₃ or TiO ₂ can be considered. It is also possible to form the reflective film 8 with a multilayer dielectric film. In this case, the thickness of each dielectric film is set to 1/4 of the wavelength of the optical signal, and the refractive index of each dielectric film is set to It is desirable to make them different in the order of lamination. Specifically, as the material of the dielectric film, SiO ₂ , Al ₂ O ₃ , ZrO ₂ or the like can be considered. The material of the reflective film 8 can be any material as long as it is not a conductive material and has a high reflectance.

  FIG. 3 is a cross-sectional view of a reflective optical coupling device 1 showing a comparative example. The optical coupling device 1 in FIG. 3 has the same structure as the optical coupling device 1 in FIG. 1 except that the reflective film 8 is not provided. As shown in FIG. 3, when there is no reflection film 8, the optical signal emitted from the light emitting element 4 is reflected by the second resin portion 7 and received by the light receiving element 5. The reflectivity of must be high. For this reason, it is difficult to use an inexpensive black resin as the second resin portion 7, and a white resin is used. However, even if a white resin is used as the second resin portion 7, a part of the optical signal emitted by the light emitting element 4 is absorbed by the white resin as indicated by a broken line arrow in FIG. 3. Further, since the surface of the white resin is not a specular reflection surface, it is reflected in various directions, and the amount of light received by the light receiving element 5 cannot be increased. In order to increase the amount of light received by the light receiving element 5, it is necessary to use an expensive light emitting element 4 having a large light emission output.

  On the other hand, according to the optical coupling device 1 of FIG. 1, most of the optical signal emitted by the light emitting element 4 is reflected by the reflective film 8 instead of the second resin portion 7 and received by the light receiving element 5. The Since the surface of the reflective film 8 is a mirror surface, the optical signal incident on the reflective film 8 is reflected in a direction corresponding to the incident angle, and the amount of light received by the light receiving element 5 can be increased. Moreover, a part of inner surface of the 2nd resin part 7 will be covered with the reflecting film 8, and the light quantity absorbed by the 2nd resin part 7 can be reduced. Therefore, the utilization efficiency of the optical signal emitted from the light emitting element 4 is improved, and the coupling characteristic representing the transmission efficiency of the optical signal can be improved. In addition, since the absorption of the optical signal can be suppressed by the reflective film 8, it is possible to use a black resin that absorbs light more easily than the white resin as the second resin portion 7. Since the black resin has a lower member cost than the white resin, the member cost can be reduced. Furthermore, even if a part of the external light passes through the second resin portion 7, it can be shielded by the reflective film 8, so that the light receiving element 5 is not easily affected by noise light such as external light. Thereby, according to this embodiment, the 2nd resin part 7 can be made thin, and size reduction of the package size of the optical coupling device 1 can be achieved.

  In FIG. 1, the reflective film 8 is disposed above the upper surfaces of the light emitting element 4 and the light receiving element 5, but the place where the reflective film 8 is provided is not necessarily limited to the place shown in FIG.

  4 is a cross-sectional view of a reflective optical coupling device 1 showing a first modification of FIG. 1, and FIG. 5 is a cross-sectional view of a light-emitting element 4 used in the first modification. The light extraction portion of the light emitting element 4 in the optical coupling device 1 according to the first modification is disposed on the side of the joint surface with the first lead frame 2 or on the side surface. In addition, the light receiving portion 5 a of the light receiving element 5 is disposed on the joint surface side with the second lead frame 3.

  In order to provide the light extraction portion 4a of the light emitting element 4 on the joint surface side with the first lead frame 2, the place where the n-type electrode 18 is provided is arranged on the upper surface side of the translucent substrate 11 as shown in FIG. The light may be extracted from the bottom surface side of the translucent substrate 11. Alternatively, the n-type electrode 18 may be a transparent electrode with the same layer configuration as that of FIG.

  When the light extraction portion 4a of the light emitting element 4 is provided on the joint surface side with the first lead frame 2, the size of the light extraction portion 4c of the light emitting element 4 is provided on the first lead frame 2 as shown in FIG. It is necessary to provide an opening 2a corresponding to the above. Similarly, the second lead frame 3 has an opening 3 a corresponding to the size of the light receiving portion 5 a of the light receiving element 5.

  The optical signal emitted from the light emitting element 4 travels on the back side of the first lead frame 2 through the opening 2a. For this reason, in FIG. 4, the reflective film 8 is disposed on the back surface side of the first lead frame 2. That is, the reflective film 8 in FIG. 4 is disposed below the light emitting element 4 and the light receiving element 5. The optical signal emitted from the light emitting element 4 is reflected by the reflective film 8 disposed on the back surface side of the first lead frame 2, then passes through the opening 3 a of the second lead frame 3 and is received by the light receiving element 5. It is incident on the part 5a. By reflecting the optical signal from the light emitting element 4 by the reflective film 8 through the opening 2a, the incident range of the optical signal incident on the reflective film 8 can be narrowed, and the optical signal reflected by the reflective film 8 is reduced. The reflection range can be narrowed. Thereby, it becomes easy to guide an optical signal in the direction of the light receiving element 5. In addition, by receiving the optical signal that has passed through the opening 3a from the reflective film 8 with the light receiving element 5, the light receiving range of the light receiving element 5 can be narrowed, and the possibility of receiving noise light such as external light is reduced. .

  Even when the light extraction portion 4 a of the light emitting element 4 is provided on the side surface of the light emitting element 4, a part of the light signal emitted from the side surface proceeds to the back surface side of the first lead frame 2. The advanced light can be reflected by the reflective film 8 of FIG. 4 and can be incident on the light receiving portion 5 a of the light receiving element 5.

  FIG. 6 is a cross-sectional view of a reflective optical coupling device 1 showing a second modification. In the optical coupling device 1 of FIG. 6, reflection films 8 a and 8 b are disposed above and below the light emitting element 4 and the light receiving element 5, respectively. The light extraction portion 4 a of the light emitting element 4 in the second modification is disposed on the side of the joint surface with the first lead frame 2 or on the side surface. FIG. 6 shows an example in which the light extraction portion 4 a of the light emitting element 4 is provided on the joint surface side with the first lead frame 2. In this case, it is necessary to provide the first lead frame 2 with an opening 2 a corresponding to the size of the light extraction portion 4 a of the light emitting element 4. On the other hand, the light receiving portion 5a of the light receiving element 5 in the optical coupling device 1 of FIG. 6 is arranged on the upper surface of the light receiving element 5 as in FIG. Therefore, the second lead frame 3 is not provided with an opening.

  In the optical coupling device 1 of FIG. 6, the optical signal emitted by the light emitting element 4 passes through the opening 2 a of the first lead frame 2 and is a reflective film 8 b disposed on the back side of the first lead frame 2. It is reflected by. The optical signal reflected by the reflection film 8 b is reflected again by the reflection film 8 a on the opposite side and is incident on the light receiving portion 5 a of the light receiving element 5.

  As described above, in the optical coupling device 1 of FIG. 6, the number of reflections on the reflection films 8 a and 8 b until the light signal emitted from the light emitting element 4 is received by the light receiving element 5 increases. The amount of received light may be slightly smaller than in FIG. 1 or FIG. 4, but by making the surfaces of the reflective films 8 a and 8 b mirror surfaces, it is possible to suppress deterioration in coupling characteristics representing the transmission efficiency of optical signals. it can.

  In FIG. 6, the directions of the light extraction portion 4a of the light emitting element 4 and the light reception portion 5a of the light receiving element 5 are reversed, but the light extraction portion 4a and the light receiving portion 5a are oriented in the same direction as in FIGS. The reflection films 8a and 8b may be disposed both above and below the light emitting element 4 and the light receiving element 5 as in FIG. Thereby, for example, even if the light extraction portion 4a is provided on the side surface of the light emitting element 4, the optical signal traveling upward or downward from the light extraction portion 4a is reflected by one of the reflection films 8a and 8b at least once. Finally, the light receiving element 5 can receive the light, and the utilization efficiency of the optical signal can be improved.

  FIG. 7 is a cross-sectional view of a reflective optical coupling device 1 showing a third modification. The optical coupling device 1 in FIG. 7 is different from that in FIG. 1 in the shape of the first resin portion 6. The first resin portion 6 in FIG. 7 has a size matching the outer size of the light emitting element 4 and the light receiving element 5 only on the joint surface side of the light emitting element 4 and the light receiving element 5 in the first lead frame 2 and the second lead frame 3. The first resin portion 6 is disposed, and the first resin portion 6 is not disposed on the back surfaces of the first lead frame 2 and the second lead frame 3. Moreover, the height of the 1st resin part 6 of FIG. 7 is restrained lower than the 1st resin part 6 of FIG. That is, the volume of the 1st resin part 6 of FIG. 7 is smaller than the volume of the 1st resin part 6 of FIG. The first resin portion 6 in FIG. 7 is generally called an encap portion or a potting portion, and is a resin layer made of transparent rubber-like silicone or epoxy resin.

  The reflective film 8 in FIG. 7 is disposed close to the upper surface of the first resin portion 6. If the light extraction part 4 a of the light emitting element 4 is provided on the upper surface of the light emitting element 4, the distance to the reflection film 8 is short, so that the reflected optical signal may not be incident on the light receiving part 5 a of the light receiving element 5. Therefore, the light emitting element 4 of FIG. 7 is provided with a light extraction portion 4 a on the side surface of the light emitting element 4. The light receiving portion 5a of the light receiving element 5 is provided on the upper surface. Most of the light emitted from the light extraction portion 4 a is reflected by the reflective film 8 and is incident on the light receiving portion 5 a of the light receiving element 5.

  Since the height of the 1st resin part 6 is lower than the 1st resin part 6 of FIG. 1, the optical coupling apparatus 1 by a 3rd modification can achieve further size reduction of the optical coupling apparatus 1. FIG.

  In each example described above, the reflective film 8 is provided on at least one of the bonding surface side of the light emitting element 4 and the light receiving element 5 in the first lead frame 2 and the second lead frame 3 and the opposite back surface side. The entire surface of the first resin portion 6 may be covered with the reflective film 8. The larger the area of the reflective film 8, the more optical signals from the light emitting element 4 can be guided to the light receiving element 5.

  As described above, in the first embodiment, the light receiving element 5 is arranged in the direction y intersecting the thickness direction x of the light emitting element 4, and the periphery of the light emitting element 4 and the light receiving element 5 is covered with the transparent first resin portion 6. In addition, it is covered with an opaque second resin part 7, and a reflective film 8 is arranged at the boundary between the first resin part 6 and the second resin part 7. As a result, the optical signal emitted from the light emitting element 4 can be reflected by the reflecting film 8 and received by the light receiving element 5, and the coupling characteristic representing the transmission efficiency of the optical signal can be improved. By providing the reflective film 8, the optical signal from the light emitting element 4 is hardly absorbed by the second resin portion 6, and more optical signals can be guided to the light receiving element 5 side. Even if a part of the external light passes through the second resin portion 6, the light can be shielded by the reflective film 8, so that the light receiving element 5 is less likely to receive noise light such as external light. Thereby, an inexpensive black resin can be used as the second resin portion 7, and the member cost can be reduced.

(Second Embodiment)
In the second embodiment, a light guide is provided between the light emitting element 4 and the light receiving element 5.

FIG. 8 is a cross-sectional view of the optical coupling device 1 according to the second embodiment. The optical coupling device 1 in FIG. 8 includes a light emitting element 4, a light receiving element 5, a first substrate 21, a second substrate 22, a light guide portion 23, and a resin portion 24.
The light receiving element 5 is arranged in a direction crossing the thickness direction of the light emitting element 4. The first substrate 21 mounts the light emitting element 4 thereon. The light receiving element 5 is placed on the second substrate 22. The light guide unit 23 is disposed between the light emitting element 4 and the light receiving element 5. The light guide 23 guides the optical signal from the light emitting element 4 to the light receiving element 5. The light guide portion 23 extends in a direction intersecting the thickness direction of the light emitting element 4, and a light incident portion 23 a is provided on one end portion side of the light guide portion 23, and the other end portion side of the light guide portion 23. Is provided with a light emitting portion 23b. The light incident portion 23 a is disposed to face the light extraction portion 4 a of the light emitting element 4. The light exit part 23 b is disposed to face the light receiving part 5 a of the light receiving element 5. The light extraction portion 4 a of the light emitting element 4 is provided on the bottom surface of the light emitting element 4, and the light receiving portion 5 a of the light receiving element 5 is also provided on the bottom surface of the light receiving element 5.
The resin part 24 covers the light guide part 23, the light emitting element 4 and the light receiving element 5. The resin part 24 is formed of an opaque resin material such as a white resin or a black resin.

  The first substrate 21 and the second substrate 22 are, for example, the first lead frame 2 and the second lead frame 3, respectively. The light emitting element 4 is joined to the first lead frame 2 by a bump electrode 25. Similarly, the light receiving element 5 is joined to the second lead frame 3 by a bump electrode 25. Since the bump electrode 25 is a sphere of a predetermined size, the light emitting element 4 and the light receiving element 5 are arranged above the first lead frame 2 and the second lead frame 3 by the diameter of the bump electrode 25.

  The light guide 23 has a height equal to or less than the diameter of the bump electrode 25 and is disposed in the gap between the first lead frame 2 and the second lead frame 3 and the light emitting element 4 and the light receiving element 5. The light guide 23 guides the optical signal emitted from the light emitting element 4 to the light receiving element 5. The inner peripheral surface of the light guide portion 23 is a mirror surface, and guides the light signal incident on the light incident portion 23a to the light output portion 23b while reflecting the light signal on the inner peripheral surface.

  The optical signal emitted by the light emitting element 4 propagates from the light incident part 23 a of the light guide part 23 through the light guide part 23, passes through the light output part 23 b, and enters the light receiving part 5 a of the light receiving element 5.

  Thus, since the optical signal from the light emitting element 4 propagates through the light guide 23 with almost no leakage, the light utilization efficiency can be maximized.

  The light guide 23 can be made of a material having excellent light propagation characteristics, such as a glass plate or a transparent resin film. Further, although some loss occurs during the propagation of the optical signal, the light guide 23 may be a gap.

  The optical coupling device 1 in FIG. 8 is a semiconductor device including the first lead frame 2 and the second lead frame 3, but the optical coupling device 1 according to the present embodiment can be directly mounted on a printed circuit board or the like. is there.

  FIG. 9 is a cross-sectional view of the optical coupling device 1 showing a modification of the optical coupling device according to the second embodiment. FIG. 9 shows an example in which the optical coupling device 1 is mounted on the first substrate 21 and the second substrate 22 extending in the direction y intersecting with the thickness direction x of the light emitting element 4 and the light receiving element 5. As a specific example, the first substrate 21 and the second substrate 22 are a first wiring pattern and a second wiring pattern that are arranged separately on a circuit board such as a printed circuit board.

  The optical coupling device 1 of FIG. 9 includes a light emitting element 4 bonded to the first substrate 21 via the bump electrode 25, a light receiving element 5 bonded to the second substrate 22 via the bump electrode 25, and light emission. It has the light guide part 23 arrange | positioned between the element 4 and the light receiving element 5, and the opaque resin part 24 which covers the circumference | surroundings of the light emitting element 4, the light receiving element 5, and the light guide part 23. FIG.

  Also in the optical coupling device 1 of FIG. 9, the optical signal emitted by the light emitting element 4 propagates through the light guide 23 without loss and is received by the light receiving element 5, so that the propagation efficiency of the optical signal is improved. It can improve the binding characteristics. In particular, the optical coupling device 1 in FIG. 9 is obtained by covering the light emitting element 4, the light receiving element 5, and the light guide part 23 made of discrete parts with a resin part 24, and if necessary, the types of these discrete parts, The interval between parts can be changed.

  Thus, in 2nd Embodiment, the light emitting element 4 is arrange | positioned at the one end part side of the light guide part 23 provided on the 1st board | substrate 21 and the 2nd board | substrate 22, and the light-receiving part 5a is arrange | positioned at the other end part side. Therefore, the optical signal emitted from the light emitting element 4 can be propagated through the light guide 23 without loss and received by the light receiving element 5, thereby improving the light coupling characteristics. Moreover, since the light guide part 23 is arrange | positioned in the clearance gap between the light emitting element 4 and the light receiving element 5, and the 1st board | substrate 21 and the 2nd board | substrate 22, the thickness reduction of the optical coupling device 1 is realizable.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 Optical coupling device, 2 1st lead frame, 3 2nd lead frame, 4 Light emitting element, 5 Light receiving element, 11 Translucent substrate, 12 n-type current spreading layer, 13 n-type clad layer, 14 Active layer, 15 p Type cladding layer, 16 p-type current spreading layer, 17 p-type electrode, 18 n-type electrode

Claims (10)

A light emitting element for emitting an optical signal;
A light receiving element that is disposed in a direction intersecting the thickness direction of the light emitting element and receives the optical signal;
A transparent first resin portion that covers the periphery of the light emitting element and the light receiving element and guides an optical signal from the light emitting element to the light receiving element;
An opaque second resin portion covering the surface of the first resin portion;
An optical coupling device comprising: a reflective film that is disposed between the first resin portion and the second resin portion and reflects the optical signal from the light emitting element. The light extraction portion of the light emitting element is disposed on an upper surface of the light emitting element or a side surface of the light emitting element.
The light receiving portion of the light receiving element is disposed on the upper surface of the light receiving element,
The optical coupling device according to claim 1, wherein the reflection film is disposed on an upper side of the light emitting element and an upper side of the light receiving element. A first support plate bonded to the lower surface of the light emitting element;
A second support plate joined to the lower surface of the light receiving element,
The light extraction portion of the light emitting element is disposed on a lower surface of the light emitting element or a side surface of the light emitting element.
The light receiving portion of the light receiving element is disposed on the lower surface of the light receiving element,
The second support plate has a first through hole arranged in accordance with the position of the light receiving unit,
The optical coupling device according to claim 1, wherein the reflective film is disposed on a lower side of the first support plate and on a lower side of the second support plate. The light extraction portion of the light emitting element is disposed on the lower surface of the light emitting element,
4. The optical coupling device according to claim 3, wherein the first support plate has a second through hole arranged in accordance with a position of the light extraction portion. A first support plate bonded to the lower surface of the light emitting element;
A second support plate joined to the lower surface of the light receiving element,
The light extraction portion of the light emitting element is disposed on an upper surface of the light emitting element, a side surface of the light emitting element, or a lower surface of the light emitting element.
The light receiving portion of the light receiving element is disposed on the upper surface of the light receiving element, the side surface of the light receiving element, or the lower surface of the light receiving element,
The reflective film is disposed on an upper side of the light emitting element, an upper side of the light receiving element, a lower side of the first support plate, and a lower side of the second support plate. Optical coupling device.   The optical coupling device according to claim 1, wherein the reflective film is disposed on a side of the light emitting element.   The optical coupling device according to claim 1, wherein the reflective film is an insulator. A light emitting element for emitting an optical signal;
A light receiving element that is disposed in a direction intersecting the thickness direction of the light emitting element and receives the optical signal;
A light guide portion disposed between the light emitting element and the light receiving element, and guiding the optical signal from the light emitting element to the light receiving element;
An optical coupling device comprising: an opaque resin portion that covers the light guide portion, the light emitting element, and the light receiving element. The light extraction part of the light emitting element is disposed to face one end of the light guide part extending in a direction intersecting the thickness direction of the light emitting element,
The optical coupling device according to claim 8, wherein the light receiving portion of the light receiving element is disposed to face the other end portion of the light guide portion.   The optical coupling device according to claim 8, wherein the light guide unit is a resin film or a glass plate.

Images