JPH08125218A - Optical semiconductor device - Google Patents

Abstract

PURPOSE: To obtain an optical semiconductor device where light from a light emitting element can be received by a photodetector by detachably mounting a forming body where the light emitting element, the photodetector, and a substrate are formed in one piece at a housing body. CONSTITUTION: Illumination light from a light emitting element 4 of a photo interrupter passes through a cavity part 9, is reflected by a reflection part 12, is radiated from a hole 10, passes through a groove part 8, and then enters a hole 11. Then, it is continuously reflected by a reflection part 13 again, passes through the cavity part 9, and is positively applied to a photodetector 5. Then, since a forming body 1 where the light-emitting element 4, the photodetector 5, and the substrate 3 are formed in one piece is detachably mounted to the housing body 2, the position of the light emitting element 4 for the reflection part 12 of the housing body 2 and the position of the photodetector 5 for the reflection part 13 can be freely adjusted. Therefore, the forming body 1 can be mounted to the housing body 2 at a position where light from the light emitting element 4 can be most efficiently received by the photodetector 5, thus achieving a long-term use and extremely reducing the troublesome operation such as position adjustment due to exchange.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical semiconductor device,
In particular, the present invention relates to an optical semiconductor device having a structure with good light receiving efficiency.

[0002]

2. Description of the Related Art Conventionally, as an optical semiconductor device used as a sensor for an automatic control device, a "photointerrupter" disclosed in Japanese Patent Laid-Open No. 63-240082 is already known. This photo interrupter has a set of a light emitting element 21 and a light receiving element 22 sealed with a transparent resin 23 made of epoxy resin or the like, as shown in FIG. After being covered with the non-translucent resin 24 made of epoxy resin or the like, the transparent resin 23
And the non-translucent resin 24 for the light emitting element 21 and the light receiving element 2
2 is cut away so as to divide the groove 2 from the groove portion 25 having a concave sectional view.
Is formed. The non-translucent resin 24 has curved surface portions 26 and 27 which face each other above the light emitting element 21 and the light receiving element 22, and the light from the light emitting element 21 is once reflected by the curved surface portion 26 to form a groove portion. After passing through 25, the curved surface 27 reflects the light again toward the light receiving element 22.

In the optical semiconductor device having such a structure, the light emitted from the light emitting element 21 toward the light receiving element 22 is
The light receiving amount of the light receiving element 22 is changed by being blocked by an object (not shown) entering the groove portion 25, and the movement position of the object is recognized by the change of the light receiving amount. For this reason, the light emitting element 21 is always waiting for an object that enters the groove 25 while irradiating the light receiving element 22 with light. As described above, since the light emitting element 21 which is always kept in the light emitting state has a very high frequency of replacement due to its life, it is necessary to adjust the mounting position of the photo interrupter itself each time the replacement is performed. The sex becomes very bad. For this reason, it is desired to use the light emitting element 21 in a state where the amount of emitted light is as small as possible to extend the life time and reduce the frequency of replacement.

As described above, when the light emitting element 21 is used with a small amount of light emission, the amount of light received by the light receiving element 22 is inevitably small, so that the light from the light emitting element 21 is more efficiently received by the light receiving element 22. Have to receive light.

[0005]

However, in the optical semiconductor device having the above conventional structure, the transparent resin 2 is used.
3 and the opaque resin 24 are integrally molded, the positional deviation of the light emitting element 21 with respect to the curved surface portion 26 for allowing the light receiving element 22 to efficiently receive the light from the light emitting element 21 at the time of molding them. , And / or the light receiving element 22 is displaced relative to the curved surface portion 27, the position of the light emitting element 21 is adjusted with respect to the curved surface portion 26 so that the light from the light emitting element 21 can be efficiently received. It is impossible to adjust the position of 22,
In order to prevent the light receiving rate of the light receiving element 22 from decreasing, the light emitting amount of the light emitting element 21 must be increased to increase the light receiving amount of the light receiving element 22. We could not solve the problem of frequent frequent replacement.

The present invention has been conceived under the above circumstances, and it is an object of the present invention to provide an optical semiconductor device in which light from a light emitting element can be efficiently received by a light receiving element. .

[0007]

In order to solve this problem, the present invention is directed to a substrate, a light emitting element and a light receiving element provided on the substrate with a predetermined space therebetween, and a light emitting element that accommodates the substrate. And a container having a reflecting portion that continuously reflects the light of the above, wherein a formed body in which a light emitting element, a light receiving element, and a substrate are integrally formed is detachably attached to the container. The present invention provides an optical semiconductor device characterized by being worn.

Further, the present invention provides the above-mentioned optical semiconductor device, characterized in that a shielding portion is provided in a portion of the housing located between the light emitting element and the light receiving element.

[0009]

According to the present invention, a light emitting device,
Since the formed body in which the light receiving element and the substrate are integrally formed is detachably attached to the housing, it is possible to freely adjust the positions of the light emitting element and the light receiving element with respect to the reflecting portion of the housing. Therefore, the formed body can be attached to the housing body at a position where the light from the light emitting element is most efficiently received by the light receiving element.

Therefore, according to the optical semiconductor device of the present invention,
Since the light received by the light receiving element can be received while the light emitted from the light emitting element is suppressed to a small amount, it can be used continuously for a long time and the frequency of replacement can be extremely reduced, and the trouble of position adjustment etc. accompanying replacement It is possible to reduce the amount of work required. Further, the replacement of the light emitting element over the life of the light emitting element can be performed only by replacing the formed body without replacing the entire optical semiconductor device.

Further, in the optical semiconductor device of the present invention, when a shielding portion is provided at a portion of the housing located between the light emitting element and the light receiving element, the light receiving element directly receives light without going to the reflecting portion. Since the light that is going to the element direction can be forcibly guided to the reflecting portion, it becomes possible to more efficiently receive the light in the light receiving element.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below by taking a photo interrupter as an optical semiconductor device with reference to FIGS. 1 to 5, but the present invention is not limited to this. FIG. 1 is a main part assembly view showing a photo interrupter, and FIG. 2 is a partially cutaway sectional view showing the photo interrupter.

The photointerrupter comprises a transparent molded body 1 made of an epoxy resin and a black storage body 2 made of an epoxy resin for housing the molded body 1. The formed body 1 has a substrate 3 made of alumina ceramic sealed therein. Board 3
Has a predetermined wiring pattern (not shown) formed on its surface, and the light emitting element 4, the light receiving element 5, and the resistor 6 are mounted at predetermined positions on the wiring pattern. The light emitting element 4 is an element that emits light, and the light receiving element 5 is an element that receives the light emitted from the light emitting element 4. The light emitting surface of the light emitting element 4 and the light receiving surface of the light receiving element 5 are oriented in the upward direction in the drawing. Resistor 6
Is for adjusting the amount of light (light amount) emitted from the light emitting element 4, and is mounted on the wiring pattern of the substrate 3. In addition, a plurality of connector pins 7 for external connection are electrically connected to the wiring pattern at the end portion of the substrate 3, and these connector pins 7 reach the end surface of the formed body 1. .

The housing 2 has a concave shape in cross section having a groove 8 in the center, and has a hollow container shape having a cavity 9 (the cavity 9 serves as a light path) inside. There is. Further, substantially rectangular holes 10 and 11 are formed on both left and right side surfaces facing the groove portion 8, respectively. further,
The inner wall surfaces of the cavity portion 9 facing the holes 10 and 11 are respectively inclined (the inclined surfaces serve as light reflecting portions; hereinafter, the inner wall surfaces are referred to as reflecting portions 12 and 13).

In the housing 2 having such a structure, the above-mentioned formed body 1 is housed so that the mounting surface of the light emitting element 4 and the like faces upward. The storage method in this embodiment utilizes the recess 14 formed on the lower surface of the storage body 2. Protrusions 15 are provided on both left and right side surfaces facing the recess 14 so as to face each other. The formed body 1 is
The protrusion 15 is pushed in so as to be pushed up. The formed body 1 is positioned in the up-down direction with respect to the storage portion 2, but is in a state of being moved in the left-right direction (direction A in FIG. 1) by forcibly applying a certain amount of force. Using this state, the forming body 1 is moved in the left-right direction, and is finely adjusted so that the light emitting element 4 and the light receiving element 5 are located at the best position facing the cavity 9.

In the photo interrupter having such a structure, the light emitted from the light emitting element 4 passes through the cavity 9 and is reflected by the reflecting portion 12 to be radiated from the hole 10, and further passes through the groove portion 8 and the hole. 11 enters, is continuously reflected again by the reflecting portion 13, passes through the hollow portion 9, and is reliably received by the light receiving element 5 (the chain double-dashed line in FIG. 2 is a typical optical path).

Therefore, in this photo interrupter, since the formed body 1 in which the light emitting element 4, the light receiving element 5 and the substrate 3 are integrally formed (unitized) is detachably attached to the storage body 2, it is stored. Light-emitting element 4 for reflecting portion 12 of body 2
Since the position of the light receiving element 5 with respect to the reflecting portion 13 can be freely adjusted, the forming body 1 is placed in the housing body 2 at a position where the light from the light emitting element 4 is most efficiently received by the light receiving element 5. Can be attached.

Therefore, since this photo interrupter enables the light receiving element 5 to receive light while the amount of light emitted from the light emitting element 4 is suppressed to a small amount, it can be used continuously for a long time and the frequency of replacement is high. It is possible to extremely reduce the number of operations, and it is possible to reduce troublesome work such as position adjustment accompanying replacement as much as possible. In addition, the replacement of the light emitting element 4 over the life of the light emitting element 4 can be performed only by replacing the forming body 1.

In the present embodiment, the formed body 1 is replaced by the protrusion 1
Although it is accommodated in the storage body 2 by being fitted at 5, it is not limited to this, and it is sufficient if the formation body 1 is detachably attached to the storage body 2, as shown in FIG. As shown, the housing 2 is provided with a screw hole, and a bolt screw 16 or the like is screwed into the screw hole to press the forming body 1.
It may be attached mechanically.

Further, as shown in FIG. 4, the formed body 1 in this embodiment is provided with a notch 17 having a concave sectional view in a portion located between the light emitting element 4 and the light receiving element 5. If the notch 17 is fitted into the groove 8 of the housing 2 and attached to the housing 1, the light that is going to go directly from the light emitting element 4 to the light receiving element 5 is transmitted to the inner surface 18 of the housing 2. Since the light can be reflected and forcibly guided to the reflecting portion 12, the inner side surface 18 serves as a shielding portion between the light emitting element 4 and the light receiving element 5, and the efficiency toward the light receiving element 5 is improved. It is possible to selectively receive the light (the shaded portion in FIG. 4 is the forming body).

Further, in this embodiment, the reflecting portion 12
Is flat, but is not limited to this,
It may be curved. In addition, in this embodiment,
When the portion of the formed body 1 located above the light emitting element 4 and the light receiving element 5 is curved as shown in FIG. 5, the light collecting property is further improved. Further, in the present embodiment, the formed body 1 has a substantially rectangular parallelepiped shape, but the present invention is not limited to this.

Further, in this embodiment, the forming body 1 and the containing body 2 are formed of epoxy resin, but the present invention is not limited to this.

[Brief description of drawings]

FIG. 1 is an essential part assembly view showing a photo interrupter of the present embodiment.

FIG. 2 is a partially cutaway sectional view showing a photo interrupter of the present embodiment.

FIG. 3 is an explanatory diagram for explaining a state in which the forming body is mechanically attached to the storage body by a bolt screw or the like in the photo interrupter of the present embodiment.

FIG. 4 is an explanatory diagram for explaining a state in which a shielding portion is provided between a light emitting element and a light receiving element in the photo interrupter of the present invention.

FIG. 5 is an explanatory diagram for explaining a photointerrupter of the present invention in which the portions of the formed body located above the light emitting element and the light receiving element are curved.

FIG. 6 is a cross-sectional view of essential parts showing a conventional optical semiconductor device.

[Explanation of symbols]

 1 Forming Body 2 Housing 3 Substrate 4 Light Emitting Element 5 Light Receiving Element 6 Resistor 7 Connector Pin 8 Groove 9 Groove 10 Hole 11 Hole 12 Reflector 13 Reflector 14 Recess 15 Protrusion 16 Bolt Screw 17 Notch

Claims (2)

[Claims] 1. A substrate, a light emitting element and a light receiving element provided on the substrate at a predetermined distance from each other, and an accommodation body having the substrate and having a reflecting portion for continuously reflecting light from the light emitting element. An optical semiconductor device comprising: a light emitting element, a light receiving element, and a substrate integrally formed with the formed body, which is detachably attached to the housing body. apparatus. 2. The optical semiconductor device according to claim 1, wherein a shielding portion is provided in a portion of the housing body located between the light emitting element and the light receiving element.