JPS63173377A - Semiconductor photoelectric conversion device - Google Patents

Abstract

PURPOSE:To reduce a detection range and improve resolving power, by providing a package part covering a light receiving surface with a recessed part, making its recessed bottom narrower than the light receiving surface of a photodetector, and making an aperture of the recessed part wider than the recessed bottom. CONSTITUTION:A recessed part 15 is formed on the light receiving side of a package 13 in which a light emitting element 11 and a photodetector 12 are sealed and unified in a body with light permeating resin. The recessed part 15 is formed in the manner in which the recessed bottom 16 is narrower than the light receiving surface of the light receiving element 12, and the aperture 17 of the recessed part is wider than the recessed bottom 16. In an interrupter constituted in such a manner, the light generated from the light emitting element 11 enters the photodetector 12 side through a detection space 14 of an object. In the light receiving element 12 side, the light which enters the bottom surface 16 of the recessed part 15 formed smaller than the light receiving surface permeates to the light receiving surface, and the other light which enters side surfaces 18 of the recessed part 15 is refracted by the inclination of the side surfaces 18 and does not enter the light receiving surface. Accordingly, a detection range for an object to be detected existing in the detection space 14 is reduced, and excellent resolving power can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a semiconductor photoelectric conversion device, and particularly to a reflective sensor.

[Prior art]

An interrupter detects the presence or absence of an object by using the fact that if there is a blocking object, light is not transmitted, and if there is no blocking object, light is transmitted.If there is a reflective object, light is transmitted by reflection. Semiconductor photoelectric conversion devices such as reflective sensors that detect the presence or absence of an object by utilizing this phenomenon are becoming smaller and are desired to have improved resolution.

In the conventional interrupter, as shown in FIG. 3, a light emitting element 1 and a light receiving element 2, which are separately molded with resin, are housed in a case 3 that prevents disturbance light.

A slit 4 is provided in the case 3, and resolution is adjusted by changing the width of the slit 4.

This type of interrupter has a structure in which the light emitting element 1 and the light receiving element 2, which are each molded separately from resin, are housed in a case 3, so there are many parts and the process of aligning and fixing the slits is required. There are problems in that the assembly is complicated and expensive.

In addition, to solve this problem, there is a technique that integrally seals each element with a transparent resin, as described in Japanese Patent Application Laid-open No. 60-225485, but the detection range of objects becomes wider and the resolution becomes lower. This results in a decrease in accuracy, and in order to improve the resolution, it is necessary to completely form the slit.

[Problem that the invention seeks to solve]

Conventional interlagers involve assembling independently formed light-emitting elements and light-receiving elements and fixing them in a storage case, which increases the number of parts and processes, making them expensive. Furthermore, even if each element is integrally sealed, there is a problem in that slits must be formed in order to improve resolution.

An object of the present invention is to solve the above problems and provide an inexpensive and highly accurate semiconductor photoelectric conversion device.

[Failure to solve the problem]

The present invention provides a semiconductor photoelectric conversion device in which a light-emitting element and a light-receiving element are integrally sealed, in which a recess is provided in a back cage portion that covers a light-receiving surface, the bottom surface of the recess is narrower than the light-receiving surface of the light-receiving element, and a four-part opening is provided. The portion is characterized by being formed wider than the bottom surface of the recess.

[Function] In the present invention, in the recess provided in the package portion covering the light-receiving element, light incident on the bottom surface of the recess is transmitted to the light-receiving element, and light incident on the side surfaces of the recess is refracted by the inclination of the four side surfaces. As described above, in the semiconductor photoelectric conversion device according to the present invention, the width for detecting an object is not small, and the resolution is as good as the conventional device in which a slit is provided in the case housing each element.

〔Example〕

As an embodiment of the present invention, the interrupter shown in FIG. 1 will be explained. FIG. 1(a) is a side view of the interrupter of the present invention, and FIG. 1(b) is a plan view.

For example, a light emitting element 11 such as an LED and a light receiving element 12 such as a photodiode are placed facing each other across a space 14 for detecting an object, and are integrally sealed with a translucent resin 13. There is.

Conventionally, a slit was formed in the case on the light-emitting surface side and the light-receiving surface side facing each other across the detection space 14, but in the present invention, the light-emitting element 11 and the light-receiving element 12 are integrally sealed with a translucent resin. A recess 15 is provided on the light-receiving surface side of the stopped package 13. The recess 15 is formed so that the recess bottom 16 is narrower than the light receiving surface of the light receiving element 12 and the recess opening 17 is wider than the recess bottom 16 . In the thus formed interrupter, as shown in FIG. 1(C), light emitted from the light emitting element 11 passes through the object detection space 14 and enters the light receiving element 12 side. On the light-receiving element 12 side, a recess 1 is formed smaller than the light-receiving surface.
The light incident on the bottom surface 16 of the recess 15 is transmitted to the light receiving surface, and the light incident on the other side surfaces 18 of the recessed portion 15 is refracted by the inclination of the side surfaces 18 and does not enter the light receiving surface. Therefore, the detection space 14
The detection range for the object to be detected that was present in the area is narrowed, and good resolution can be obtained.

The shape of the recess formed on the light-receiving surface side of the package is not limited to this example, and may be, for example, as shown in FIGS. 2(a), (b),
As shown in (C), the side or bottom surface of the recess may be curved. In this case, the curved surface can provide a lens effect.

Also, in this embodiment, the interrupter is explained, but
The present invention is not limited to this, and it is also possible to provide a recess on the light receiving side of the reflective sensor, for example.

〔Effect of the invention〕

As explained above, according to the present invention, by integrally sealing the light-emitting element and the light-receiving element, the number of parts and assembly man-hours can be reduced, reducing costs, and the light-emitting element and the light-charging element can be integrally sealed. By providing a concave portion on the light-receiving surface side of the light-receiving element of the package, the detection range can be narrowed, resolution can be improved, and a highly accurate semiconductor photoelectric conversion device can be provided.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, and FIG. 3 shows an example of the prior art.

Claims (1)

[Claims] (1) In a semiconductor photoelectric conversion device comprising a light-emitting element, a light-receiving element that receives light from the light-emitting element, and a package that integrally seals the light-emitting element and the light-receiving element, the light-receiving surface of the light-receiving element is A semiconductor photoelectric conversion device characterized in that a recess is provided in the package portion, a bottom surface of the recess is formed to be narrower than at least a light receiving surface of the light receiving element, and an opening of the recess is formed to be wider than the bottom surface of the recess.