JPH11251621A - Photocoupler and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photocoupler capable of facilitating alignment in the case of packaging a substrate, by a method wherein the dispersion of the packaging positions on a substrate, the slippage in the turning direction on the packaging surface as well as the inverse insertion inverting the positions of a light emitting element and a photo-detecting element are avoided. SOLUTION: In a photocoupler packaged to be composed on a substrate wherein a light emitting element converting electric signal into photosignals as well as a photo-detecting element converting the photosignals into the electric signals oppositely arranged in different lead frames to be molded, multiple projections 9a, 9b are provided on the surface of a substrate 10, while multiple recessions 10a, 10b corresponding to the projections 9a, 9b are provided on the substrate 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical coupling device such as a photocoupler, a phototriac coupler, etc.
The present invention relates to a surface mounting type optical coupling device mounted on a substrate and a method of manufacturing the same.

[0002]

2. Description of the Related Art A conventional surface mounting type optical coupling device will be described with reference to FIG. As shown in FIG. 5, in this optical coupling device, a light emitting element 1 and a light receiving element 2 are arranged on lead frames 3 and 4 so as to face each other.
Are molded with a light-transmitting resin 8, and the periphery thereof is molded with a light-shielding resin 9, which is mounted on a substrate 10.

To manufacture this optical coupling device, first, a light emitting element 1 and a light receiving element 2 are connected to respective lead frames 3, 4 respectively.
Is bonded with a conductive paste 5 such as a silver paste or the like, and a wire bond is applied to each with a conductive wire 6 such as a gold wire, and then the light emitting element 1 is pre-coated with a silicon resin 7.
Then, the light-emitting element 1 and the light-receiving element 2 are optically opposed to each other by, for example, spot welding or setting on a loading frame, and primary molding is performed with the translucent resin 8. Further, after deburring, secondary molding is performed with the light-shielding resin 9.

Next, this is mounted on a substrate 10. In this case, the mounting position is conventionally determined by borrowing the terminal portion using a highly adhesive material such as flux as the adhesive 14.

[0005] In the technique disclosed in Japanese Patent Application Laid-Open No. 92-30192, a projection 9d is provided on the surface of the light-shielding resin 9 mounted on the substrate 10, and the substrate 10 is adapted to fit into the projection 9d. A configuration in which the formed recess 10d is provided is disclosed (see FIG. 6). In this optical coupling device, positioning at the time of mounting is performed by fitting these convex portions 9d and concave portions 10d.

[0006]

However, the conventional surface mounting type optical coupling device shown in FIG. 5 has a problem that the mounting positions vary greatly.
For this reason, a problem of reverse insertion in which the positions of the light emitting element 1 and the light receiving element 2 are reversed occurs.

On the other hand, in the optical coupling device shown in FIG.
Although there is no variation in the mounting position as shown in (1), there is a shift in the rotation direction about the convex and concave portions as axes. Therefore, even with this configuration, reverse insertion has also occurred.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and there is a problem that the position of the light-emitting element and the light-receiving element are different from each other in the variation of the mounting position on the substrate, the shift in the rotation direction on the mounting surface. It is an object of the present invention to provide an optical coupling device and a method for manufacturing the optical coupling device, which can easily perform positioning at the time of mounting on a board by preventing reverse insertion.

[0009]

According to the first aspect of the present invention, there is provided a light emitting device for converting an electric signal into an optical signal and a light receiving device for converting the optical signal into an electric signal. In an optical coupling device configured to be disposed opposite to a different lead frame, molded and mounted on a substrate, a plurality of convex portions are provided on a mounting surface with the substrate, and a plurality of concave portions corresponding to the convex portions are formed on the substrate. Is provided.

According to the first aspect of the present invention, a plurality of protrusions are provided on the mounting surface with the substrate, and a plurality of recesses corresponding to the protrusions are provided on the substrate. Of the light emitting element and the light receiving element can be prevented from being reversely inserted such that the positions of the light emitting element and the light receiving element are reversed.

Further, according to the invention described in claim 2, in the optical coupling device described in claim 1, the plurality of protrusions and the plurality of recesses are set so as to be asymmetric on the light emitting element side and the light receiving element side. It is arranged and configured.

According to the second aspect of the present invention, the plurality of convex portions and the plurality of concave portions are arranged so as to be asymmetric on the light emitting element side and the light receiving element side, so that the light emitting element By preventing reverse insertion in which the position with respect to the light receiving element is reversed, positioning at the time of mounting on the substrate can be easily performed. Here, the asymmetric arrangement of the convex portions and the concave portions means that the intervals between the plural convex portions and the concave portions are changed, or the convex portions and the concave portions located only on one of the light emitting element side and the light receiving element side are arranged. In addition, the light emitting element side and the light receiving element side are prevented from being erroneously mounted on the substrate, for example, by changing the shape and size of the plurality of convex portions and concave portions between the light emitting element side and the light receiving element side.

Further, according to the third aspect of the present invention, in the optical coupling device according to the first or second aspect, the width of the concave portion is larger than that of the corresponding convex portion by 10 to 60 μm. .

According to the third aspect of the present invention, since the width of the concave portion is set to be larger than the width of the corresponding convex portion by 10 to 60 μm, the convex portion can be easily fitted into the corresponding concave portion. And workability during mounting on a substrate is improved.

According to the present invention, a light emitting element for converting an electric signal into an optical signal and a light receiving element for converting the optical signal into an electric signal are arranged opposite to a different lead frame and molded. In the manufacturing method of the optical coupling device to be mounted on, when performing the outermost molding, a plurality of convex portions are formed on the mounting surface with the substrate using the eject pins of the molding device, and each of the plurality of convex portions is formed. A plurality of corresponding concave portions are formed in the substrate.

According to the fourth aspect of the present invention, when performing the outermost molding, a plurality of convex portions are formed on the mounting surface with the substrate by using an eject pin of the molding device, and the plurality of convex portions are formed. Since a plurality of concave portions corresponding to each are formed on the substrate, the convex portions can be easily formed, and the mounting position on the substrate varies, the rotational direction shifts on the mounting surface, and the positions of the light emitting element and the light receiving element are reversed. It is possible to manufacture an optical coupling device that can prevent reverse insertion and can easily perform positioning during mounting on a substrate. In order to prevent reverse insertion, the interval between the plurality of convex portions and concave portions may be changed, or the convex portions and concave portions located only on one of the light emitting element side and the light receiving element side may be arranged. If a plurality of convex portions and concave portions are formed at positions that are asymmetric on the light emitting element side and the light receiving element side, such as changing the shape and size of the convex portions and concave portions between the light emitting element side and the light receiving element side good.

According to the fifth aspect of the present invention, a light emitting element for converting an electric signal into an optical signal and a light receiving element for converting the optical signal into an electric signal are opposed to a different lead frame and molded. In the method of manufacturing the optical coupling device mounted on the upper surface, when performing the outermost molding, a plurality of convex portions are formed on the mounting surface with the substrate by the shape of the mold, and the plurality of convex portions correspond to each of the plurality of convex portions. A plurality of recesses are formed in the substrate.

According to the fifth aspect of the present invention, when the outermost molding is performed, a plurality of convex portions are formed on the mounting surface with the substrate according to the shape of the mold, and each of the plurality of convex portions is formed. Since a plurality of corresponding concave parts are formed on the substrate, convex parts can be easily formed, and the mounting position on the substrate varies, the rotation direction on the mounting surface shifts, and the light emitting element and the light receiving element reversely insert. Thus, an optical coupling device capable of easily performing positioning at the time of mounting on a substrate can be manufactured. In order to prevent reverse insertion, the interval between the plurality of convex portions and concave portions may be changed, or the convex portions and concave portions located only on one of the light emitting element side and the light receiving element side may be arranged. If a plurality of convex portions and concave portions are formed at positions that are asymmetrical on the light emitting element side and the light receiving element side, such as changing the shape and size of the convex portions and concave portions between the light emitting element side and the light receiving element side good.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. In the following description, the same reference numerals are used for the same components as those of the above-described conventional technology. Further, the present invention is not limited to the following embodiments.

[First Embodiment] A schematic structure of an optical coupling device according to a first embodiment is shown in a sectional view of a main part of FIG. As shown in FIG. 1, the optical coupling device according to the present embodiment has a light emitting element 1 and a light receiving element 2 arranged opposite to each other on lead frames 3 and 4, and the light emitting element 1 and the light receiving element 2 are made of a light-transmitting resin. 8 and the periphery thereof is molded with a light-shielding resin 9, which is mounted on a substrate 10. The light-shielding resin 9 has two projections 9a,
9b are provided, and the substrate 10 has two concave portions 10a and 10a.
b is provided.

In manufacturing the optical coupling device, first, the light emitting element 1 and the light receiving element 2 are connected to the respective lead frames 3 and 4 respectively.
Then, the light emitting element 1 and the light receiving element 2 are wire-bonded with a conductive wire 6 such as a gold wire, respectively, and then the light emitting element 1 is pre-coated with a silicon resin 7. The light emitting element 1 and the light receiving element 2 are optically opposed to each other by, for example, spot welding or setting on a loading frame, and the primary molding is performed with the translucent resin 8. Further, after deburring, secondary molding is performed with the light-shielding resin 9.

At the time of this secondary molding, the projections 9a, 9b
Are formed in two places, and the method will be described with reference to FIG. An upper mold 12, a lower mold 13, and an eject pin 11 used for a secondary molding using the light-shielding resin 9 are provided inside the molding apparatus. The eject pin 11 is provided with concave portions 11a and 11b for forming the convex portions 9a and 9b, thereby easily forming two convex portions 9a and 9b at the time of secondary molding. Can be.

In addition to the one shown in FIG. 2, the projections 9a and 9b can be easily formed at the time of the secondary molding, as shown in FIG. That is, in FIG. 3, unlike the one shown in FIG. 2, concave portions 13 a and 13 b for forming the convex portions 9 a and 9 b are provided in the lower mold 13 which is one of the mold dies. Easily 2
The convex portions 9a and 9b at the locations can be formed. In addition,
The upper mold 12 of FIG. 3 is similar to the upper mold 12 of FIG. 2, and the eject pin 11 of FIG. 3 is different from the eject pin 11 of FIG. 2 in that the recesses 11a and 11b are not provided.

Next, this is mounted on the substrate 10. As shown in FIG. 1, the projections 9a and 9
The recesses 10a and 10b are formed so as to be fitted in correspondence with b. At this time, the groove width of the concave portions 10a and 10b is
The width is formed to be 10 μm to 60 μm larger than the width of the protrusions 9 a and 9 b.

In this embodiment, when the substrate is mounted with the above configuration, a plurality of convex portions 9a, 9
b, since a plurality of recesses 10a and 10b are formed in the substrate 10, it is possible to prevent a variation in a mounting position on the substrate 10 and a shift in a rotation direction on a mounting surface, and to easily perform positioning when mounting the substrate. Was completed. And the recesses 10a, 10b
Is 10 μm larger than the width of the corresponding projections 9a and 9b.
Since the size was increased by m to 60 μm, the protrusions 9a and 9b could be easily fitted into the corresponding recesses 10a and 10b, and the workability at the time of mounting the board was good.

The projections 9a, 9b and the depressions 10a, 1
Although 0b was not described in detail, the shape of the convex portion may be a columnar shape or a prismatic shape, and the concave portion may have a shape corresponding thereto. In the present embodiment, the protrusions 9a, 9
b were the same shape, but these shapes were
If the light-receiving element 2 and the light-receiving element 2 are made different from each other so as to be asymmetrical, reverse insertion in which the positions of the light-emitting element and the light-receiving element are reversed can be prevented.

Second Embodiment A schematic structure of an optical coupling device according to a second embodiment is shown in FIG. As shown in FIG. 4, in the optical coupling device of the present embodiment, the light emitting element 1 and the light receiving element 2 are arranged on the lead frames 3 and 4 so that the light emitting element 1 and the light receiving element 2 are made of a transparent resin. 8 and the periphery thereof is molded with a light-shielding resin 9, which is mounted on a substrate 10. The light-shielding resin 9 has three projections 9a,
9b and 9c are provided.
a, 10b, and 10c are provided. The protrusion 9
The intervals between the projections 9a-9b (recesses 10a-10b) are set so as to be asymmetric between the light emitting element 1 side and the light receiving element 2 side.
The projections 9b-9c (recesses 10b-10c) are arranged so as to have different intervals.

In manufacturing the optical coupling device, first, the light emitting element 1 and the light receiving element 2 are connected to the respective lead frames 3, 4 respectively.
Then, the light emitting element 1 and the light receiving element 2 are each wire-bonded with a conductive wire 6 such as a gold wire, and then the light emitting element 1 is pre-coated with a silicon resin 7. The light emitting element 1 and the light receiving element 2 are optically opposed to each other by, for example, spot welding or setting on a loading frame, and the primary molding is performed with the translucent resin 8. Further, after deburring, secondary molding is performed with the light-shielding resin 9.

At the time of this secondary molding, the protrusions 9a, 9
b and 9c are formed at three places.
As in the first embodiment, whether the eject pin 11 is provided with a recess (see FIG. 2) or the lower mold 13 is provided with a recess (see FIG. 3), the three protrusions 9a, 3 are easily provided. 9b,
9c can be formed.

Next, this is mounted on the substrate 10. As shown in FIG. 4, the projections 9a and 9
b, 9c so that the recesses 10a, 10c
b and 10c are formed in advance. At this time, the concave portions 10a, 1
The groove widths of 0b and 10c are formed to be 10 μm to 60 μm larger than the widths of the protrusions 9a, 9b and 9c.

In this embodiment, when the substrate is mounted with the above configuration, a plurality of convex portions 9a, 9
b, 9c are formed in the substrate 10 by a plurality of recesses 10a, 10b, 1
Since 0c was formed, variation in the mounting position on the substrate 10 and deviation in the rotation direction on the mounting surface were prevented, and positioning at the time of mounting the substrate could be easily performed. Then, the widths of the concave portions 10a, 10b, and 10c are set to the corresponding convex portions 9.
Since the widths of the projections 9a, 9b, 9c are larger than the widths of the projections 9a, 9b, 9c by 10 μm to 60 μm,
0a, 10b, and 10c could be easily fitted, and workability at the time of board mounting was good.

Further, in the present embodiment, the convex portions 9a, 9
The distance between the convex portions 9a-9b (the concave portions 10a-10b) and the convex portions 9a and 9c and the concave portions 10a, 10b, and 10c are set so as to be asymmetric on the light emitting element 1 side and the light receiving element 2 side.
Since the gap between b-9c (recesses 10b-10c) was formed differently, the reverse insertion in which the positions of the light emitting element and the light receiving element were reversed could be prevented during the mounting on the substrate.

The projections 9a, 9b, 9c and the recess 10
Although a, 10b, and 10c have not been described in detail, the shape of the convex portion may be a column shape or a prism shape, and the concave portion may have a shape corresponding thereto. In the present embodiment, similarly to the first embodiment, the protrusions 9a, 9b, 9
The shape of c is the same, but as described above, the protrusions 9a,
Since the intervals between 9b, 9c and recesses 10a, 10b, 10c were changed, it was possible to prevent reverse insertion in which the positions of the light emitting element and the light receiving element were reversed without changing their shapes.

[0034]

As described above, according to the first aspect of the present invention, a plurality of projections are provided on the mounting surface with the substrate,
A plurality of concave portions corresponding to the convex portions are provided on the substrate, so that the mounting position on the substrate varies, the rotation direction on the mounting surface shifts, and the light emitting element and the light receiving element are reversed in reverse insertion. Is prevented, and positioning at the time of mounting on the substrate can be easily performed.

Further, according to the second aspect of the present invention,
Since the plurality of convex portions and the plurality of concave portions are arranged so as to be asymmetrical on the light emitting element side and the light receiving element side, it is possible to prevent reverse insertion in which the positions of the light emitting element and the light receiving element are reversed. ,
Positioning at the time of board mounting can be easily performed. Here, the asymmetric arrangement of the convex portions and the concave portions means that the intervals between the plural convex portions and the concave portions are changed, or the convex portions and the concave portions located only on one of the light emitting element side and the light receiving element side are arranged. In addition, the light emitting element side and the light receiving element side are prevented from being erroneously mounted on the substrate, for example, by changing the shape and size of the plurality of convex portions and concave portions between the light emitting element side and the light receiving element side.

Further, according to the third aspect of the present invention,
The width of the recess is 10 to 60 μm larger than the width of the corresponding projection.
Since it is configured to have a larger m, the convex portion can be easily fitted into the corresponding concave portion, and workability at the time of mounting the substrate is improved.

According to the fourth aspect of the present invention, when performing the outermost molding, a plurality of projections are formed on the mounting surface with the substrate by using an eject pin of the molding apparatus,
Since a plurality of concave portions corresponding to each of the plurality of convex portions are formed on the substrate, the convex portions can be easily formed, and a variation in a mounting position on the substrate, a shift in a rotation direction on the mounting surface, a light emitting element and a light receiving element. It is possible to manufacture an optical coupling device capable of preventing reverse insertion where the position is reversed and easily performing positioning at the time of mounting on a substrate. In order to prevent reverse insertion, the interval between the plurality of convex portions and concave portions may be changed, or the convex portions and concave portions located only on one of the light emitting element side and the light receiving element side may be arranged. If a plurality of convex portions and concave portions are formed at positions that are asymmetrical on the light emitting element side and the light receiving element side, such as changing the shape and size of the convex portions and concave portions between the light emitting element side and the light receiving element side good.

According to the fifth aspect of the present invention, when performing the outermost molding, a plurality of convex portions are formed on the mounting surface with the substrate by the shape of the mold, and the plurality of convex portions are formed. Since a plurality of concave portions corresponding to each are formed on the substrate, a convex portion can be easily formed, and the mounting position on the substrate varies, the rotational direction shifts on the mounting surface, and the positions of the light emitting element and the light receiving element are reversed. It is possible to manufacture an optical coupling device that can prevent reverse insertion and can easily perform positioning during mounting on a substrate. In order to prevent reverse insertion, the interval between the plurality of convex portions and concave portions may be changed, or the convex portions and concave portions located only on one of the light emitting element side and the light receiving element side may be arranged. If a plurality of convex portions and concave portions are formed at positions that are asymmetrical on the light emitting element side and the light receiving element side, such as changing the shape and size of the convex portions and concave portions between the light emitting element side and the light receiving element side good.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a schematic structure of an optical coupling device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part inside a molding apparatus for forming projections 9a and 9b of the light-shielding resin 9 shown in FIG.

FIG. 3 is a sectional view of a main part inside a molding apparatus for forming protrusions 9a and 9b of the light-shielding resin 9 shown in FIG.

FIG. 4 is a cross-sectional view of a main part showing a schematic structure of an optical coupling device according to a second embodiment.

FIG. 5 is a sectional view of a main part showing a schematic structure of a conventional optical coupling device.

FIG. 6 is a sectional view of a main part showing a schematic structure of a conventional optical coupling device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light emitting element 2 Light receiving element 3, 4 Lead frame 8 Translucent resin 9 Light shielding resin 9a, 9b, 9c Convex part 10 Substrate 10a, 10b, 10c Concave part 11 Eject pin 12 Upper mold 13 Lower mold

Claims (5)

[Claims] 1. A light-emitting element which converts an electric signal into an optical signal and a light-receiving element which converts the optical signal into an electric signal are arranged oppositely to different lead frames, molded, and mounted on a substrate. In the coupling device, a plurality of protrusions are provided on a mounting surface with the substrate,
An optical coupling device, wherein a plurality of concave portions corresponding to the convex portions are provided on the substrate. 2. The optical coupling device according to claim 1, wherein
The optical coupling device, wherein the plurality of protrusions and the plurality of recesses are arranged so as to be asymmetric on the light emitting element side and the light receiving element side. 3. The optical coupling device according to claim 1, wherein the width of the concave portion is one more than the width of the corresponding convex portion.
An optical coupling device, which is larger by 0 to 60 μm. 4. Manufacture of an optical coupling device in which a light emitting element for converting an electric signal into an optical signal and a light receiving element for converting the optical signal into an electric signal are arranged opposite to different lead frames, molded, and mounted on a substrate. In the method, a plurality of protrusions are formed on a mounting surface with the substrate by using an eject pin of a molding apparatus when performing an outermost mold, and a plurality of recesses corresponding to each of the plurality of protrusions are formed on the substrate. A method for manufacturing an optical coupling device, comprising: 5. A manufacturing method of an optical coupling device in which a light emitting element for converting an electric signal to an optical signal and a light receiving element for converting the optical signal to an electric signal are arranged facing different lead frames, molded, and mounted on a substrate. In the method, when performing the outermost molding, a plurality of convex portions are formed on a mounting surface with the substrate by a shape of a mold, and a plurality of concave portions corresponding to each of the plurality of convex portions are formed on the substrate. A method of manufacturing an optical coupling device.