JPS6122284A - Manufacture of photointerruptor - Google Patents

Abstract

PURPOSE:To obtain an inexpensive photointerruptor requiring no housing, by respectively molding a light emitting element and a light receiving element in a light pervious resin to mold both of them into separate split pieces and connecting both pieces by simultaneously molded protruded and recessed parts. CONSTITUTION:A light emitting element and a light receiving element are molded in a light pervious resin to mold separate split pieces 5. At the time of the moldng of the split pieces 5, a protruded part 6 and a recessed part 7 used in inlaying and locating are formed. A projected part 5a is also provided so as to generate a proper interval D between the light emitting element and the light receiving element when the split pieces 5 are connected. When the split piece 5 of the light emitting element and the split piece 5 of the light receiving element are engaged by the protruded part 6 and the recessed part 7, both of them can be integrated as a photointerruptor.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method of manufacturing a low-cost type photointerrupter.

<Prior art> In most cases, a photointerrupter uses an infrared light emitting diode as a light emitting element, and a phototransistor as a light receiving element, facing each other, and detects the changing current flowing through the light receiving element by blocking the optical path between the light receiving and emitting elements. The existence of an object 1
It is a device that recognizes passing. Conventionally, as shown in Figures 3 and 4, photointerrupters have been manufactured using individual devices in which an infrared light emitting diode chip, which is a light emitting element, and a phototransistor chip, which is a light receiving element, are molded with a resin that transmits infrared light. 1.2 is manufactured, and the device 1.2 of the receiver 1 light emitting element is fixed 4 to the housing 3 using resin or the like.

<Object of the invention> The present invention eliminates the housing 3 that was always necessary in the past,
The objective is to simplify the manufacturing method and provide a photointerrupter suitable for mass production, thereby reducing product costs.

<Structure of the Invention> The present invention is a method for manufacturing a photointerrupter in which a light emitting element and a light receiving element are combined facing each other at an appropriate interval, and the method comprises molding each of the light emitting element and the light receiving element in a translucent resin. An auto machine characterized by molding into separate divided pieces and simultaneously molding a concave and convex portion for fitting and positioning on each divided piece, and combining both the divided pieces of the light emitting element and the light receiving element with the concave and convex portions. This is a method for manufacturing an interrupter.

<Example> FIG. 1 shows the external appearance of the divided pieces formed during manufacturing, and FIG. 2 shows the external appearance of the photointerrupter after the divided pieces are assembled. Reference numeral 5 indicates a divided piece molded with a translucent resin, 6 a resin convex portion that determines the relative position when assembling the photointerrupter, and 7 a resin recess that determines the relative position when assembling the photointerrupter.

The divided pieces 5 having the shape shown in FIG. 1 are formed using a molding method such as transfer molding. A light emitting element or a light receiving element is molded together with the molding.

When forming the divided piece 5, the convex portion 6. A recess 7 is also formed.

Note that the divided pieces 5 are provided with projecting portions 5a so that an appropriate spacing occurs when they are combined.

Obtained light-emitting element divided piece 5 and light-receiving element divided piece 5
The convex portion 6. When fitted in the recess 7, they are integrated as a photointerrupter as shown in FIG. When integrating, when using the frictional force of the mating parts, gluing the mating parts with adhesive, or welding the mating parts, burr the convex part and fix it by interlocking with the four parts. Possible methods include:

<Effects> According to the present invention with the above configuration, a housing is not required, material costs are reduced, and assembly time can be shortened, making mass production superior and inexpensive compared to conventional manufacturing methods. It becomes possible to produce a photointerrupter.

[Brief explanation of drawings]

FIG. 1 is an external perspective view of a divided piece formed in the middle of manufacturing by the manufacturing method of the present invention, FIG. 2 is an external perspective view of a photointerrupter manufactured by the manufacturing method of the present invention, and FIG. An external perspective view of a photointerrupter showing conventional technology,
FIG. 4 is a sectional view of the photointerrupter of FIG. 3.

Claims (1)

[Claims] A method for manufacturing a photo-interrupter in which a light-emitting element and a light-receiving element are combined facing each other at an appropriate interval, the light-emitting element and the light-receiving element being each molded in a translucent resin and formed into separate divided pieces. A method for manufacturing a photointerrupter, characterized in that a concavo-convex portion for fitting and positioning is simultaneously molded on each divided piece, and both the divided pieces of a light-emitting element and a light-receiving element are joined by the concave-convex portion.