JPH06839Y2 - Optical coupling element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an optical coupling element in which a light emitting element and a light receiving element are arranged in one package, and in particular, an optical coupling element in which both elements are arranged to face each other in the package. Regarding

[Conventional technology]

Conventionally, in this type of optical coupling element, as shown in FIG. 3, the light emitting element 1 and the light receiving element 2 are supported by the lead frames 5a and 5b, respectively, and electrically connected to each other, and then they are arranged so as to face each other. ing. Then, the elements 1 and 2 are embedded in the transparent resin 3, the two are optically coupled, and the outer periphery thereof is sealed with the resin mold 4.

[Problems to be solved by the invention]

The above-described conventional optical coupling element includes a light emitting element 1 and a light receiving element 2.
Since light is delivered between the transparent resin 3 and the transparent resin 3 that connect the two as a medium, the light radially emitted from the light emitting element 1 is transparent to the transparent resin 3 and the resin mold 4.
There is a problem that a part of the light is not transmitted to the light receiving element 2 by being absorbed or scattered at the interface of the light receiving element 2 and the light transmission efficiency is lowered between the light emitting element and the light receiving element, which deteriorates the optical coupling effect. is there.

An object of the present invention is to provide an optical coupling element that can improve the optical coupling effect by increasing the light transmission efficiency between the light emitting element and the light receiving element.

[Means for solving problems]

The optical coupling element of the present invention is an optical coupling element in which a light emitting element and a light receiving element are arranged opposite to each other and packaged with a transparent resin and a resin mold. A hologram that is stored so as to be condensed on the inner surface of the resin mold is arranged to prevent light absorption and light scattering on the inner surface of the resin mold to improve the light transmission efficiency between the light emitting element and the light receiving element and improve the optical coupling effect. It is configured.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a vertical sectional view of an embodiment of the present invention. The light emitting element 1 is composed of a light emitting diode or the like, and is attached and supported at the tip of the lead frame 5a and electrically connected thereto. Further, the light receiving element 2 has a photodiode formed on the surface thereof, and is attached and supported at the tip of the lead frame 5b and electrically connected thereto. The light emitting element 1 and the light receiving element 2 are vertically opposed to each other, and the hologram 6 is arranged between the light emitting element 1 and the light receiving element 2, and then they are integrally embedded in the transparent resin 3. Are optically coupled.
Further, the outer periphery of the transparent resin 3 is sealed with a resin mold 4 to form an optical coupling element.

The hologram 6 is formed by a known method. Here, as shown in FIG. 2, all the light output from the light emitting element 1 and applied to the hologram 6 is directed to the photodiode 2a on the surface of the light receiving element 2. It is formed in a holographic pattern that is stored so as to be condensed.

Therefore, according to this configuration, the light emitting element 1 is configured so that all the light emitted from the light emitting element 1 enters the hologram 6.
If the hologram 6 is set, this hologram 6
All the light transmitted through is collected by the photodiode 2a on the surface of the light receiving element 2. Therefore, most of the light emitted from the light emitting element 1 is applied to the light receiving element 2, so that the light transmission efficiency between the elements 1 and 2 can be increased and the optical coupling effect can be improved.

Further, in this configuration, since the reflection on the inner surface of the resin mold 4 is hardly used, it is not necessary to form the inner surface shape of the resin mold 4 with high precision as in the conventional case, and the manufacturing can be facilitated. Become.

[Effect of device]

As described above, according to the present invention, the hologram is arranged between the light emitting element and the light receiving element so that all the transmitted light is focused on the light receiving element. There is an effect that scattering can be prevented, the light transmission efficiency between the light emitting element and the light receiving element can be increased, and the optical coupling effect can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is a perspective view of a main portion thereof, and FIG. 3 is a cross-sectional view of a conventional structure. DESCRIPTION OF SYMBOLS 1 ... Light emitting element, 2 ... Light receiving element, 3 ... Transparent resin, 4 ... Resin mold, 5a, 5b ... Lead frame, 6 ... Hologram.

Claims (1)

[Scope of utility model registration request] 1. An optical coupling element in which a light emitting element and a light receiving element are arranged opposite to each other and packaged with a transparent resin and a resin mold, and all transmitted light is collected in the light receiving element between the light emitting element and the light receiving element. An optical coupling element comprising a hologram stored so as to be illuminated.