JPS5939073A - Semiconductor light-receiving element - Google Patents

Abstract

PURPOSE:To maintain a high degree of airtightness and reliability of the titled element by a method wherein the first coupling member fixed on a light-guide rod and the second annular coupling member provided on the outer wall of an airtight container are soldered each other. CONSTITUTION:A connector, which is the second coupling member, is attached to an insulating ring 1 in advance. The connector has an expansion coefficient similar to that of the insulating ring, and it is hard-soldered to the inner face of the hole provided on the metallized insulating ring 1. On the other hand, a light-guide stick 7 is fixed to the inner face of a fixing ring 13a, which is the first coupling member, using a suitable sealing member 14. Subsequently, the light-guide rod 7 is inserted into the connector provided on the insulating ring under the condition wherein it is fixed to the fixing ring 13a, and the connector and the fixing ring 13a are joined together using a metal solder material 15. At this time, each component part of a thyristor light-receiving element is set in the insulating ring 1 whereon a cover plate was helium-arc welded in advance, and lastly, the cover plate is helium-arc welded on the insulating ring 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a semiconductor light-receiving element that is improved so that a light guide rod that guides an optical signal to a light-receiving part of a semiconductor element operated by an optical signal and a seal of an airtight container can maintain high airtightness for a long period of time. .

In a semiconductor light-receiving element that operates by light, such as a photodiode or a light-igniting Zyristor, light from an external light source is guided through a light guide rod to a light-receiving part of a semiconductor element provided in an airtight container. . At this time, since the light guide cassette is guided from the outside through the airtight container to the light receiving section, a high degree of airtightness must be maintained between the airtight container and the light guide rod. The airtight container and light guide rod can be sealed by directly fixing the light guide rod to the airtight container using an appropriate sealant, but this method is difficult to seal due to the difference in thermal expansion between the respective materials. Cracks may occur on the surface, and the airtightness is not perfect, so mechanical sealing methods are used that use O-rings or sleeves for indirect sealing. For example, Fig. 1 shows a method of sealing an airtight container and a light guide rod in a flat light-igniting Xairinuk. is a semiconductor element 5 having a light receiving section 4
A contact electrode 6 and a guide rod 7 are housed therein, and the relative positions of these components are determined by a guide ring 8. The light guide rod 7 is passed through the connector 9 provided on the insulating ring 1 so that one end is located above the light receiving part, and the other end is fastened with the screw part of the connector 9 and the connector cap 11 using the O-ring 10. It is fixed and sealed with an airtight container. Further, the light guide rod 7 is connected to the external light guide 1 at the outer end of the airtight container.
Connected to 2.

However, when assembling this light ignition cyrisk, even if you slide it so that the light guide rod 7 is positioned in the best position, the tightening force of the O-ring 10 is involved, so the light guide rod 7 and There is an assembly difficulty in that it is difficult to obtain a suitable relative position between the light receiving part 4 and the connector 9 and the connector cap during long-term use. Not only does the tightening part of the screw 11 become loose, making it impossible to maintain airtightness, resulting in a lack of reliability, but the loosening of the tightening part of the screw also causes the position of the light guide rod 7 to shift, causing the light guided by the light guide rod 7 to deteriorate. This has a fatal defect in that it becomes difficult for the light to be transmitted to the thyristor light receiving section 4, and eventually the ignition operation becomes impossible.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a semiconductor light-receiving element having a seal portion that maintains a light guide rod that guides an optical signal to a light-receiving portion with high airtightness and high reliability.

According to the present invention, this object is achieved by soldering together the annular first connecting member fixed to the light guide rod and the annular second connecting member provided on the outer wall of the airtight container.

Next, the present invention will be explained based on examples.

FIG. 2 shows an insulating ring 1 and a light guide rod 7 according to the present invention.
FIG. A connector 9, which is a second connecting member, is attached to the insulating ring 1 in advance. On the other hand, the light guide rod 7 made of quartz or glass is coated with a suitable sealing material 14 such as low melting point glass on the inner surface of the fixed ring 13 which is the first connecting member. After that, the light guide rod 7 fixed to the fixed ring 13 is inserted into the connector 9 provided on the insulating ring 1, and a metal solder is connected between the connector 9 and the fixed ring 13. At this time, the semiconductor elements 5 and guide links 8, which are the components of the Cyrisk photodetector shown in FIG. and the contact electrode 6 are set in this order, the light guide rod 7 is set at the optimum position, and finally the cover plate 2 is edge arc welded to the insulating ring 1 to complete the assembly.

In this way, in order to align the light guide rod 7 with the position of the highest firing sensitivity of the thyristor light receiving section 4, the metal brazing material 15 can be used while slidingly adjusting the fixed ring 13 that is integrated with the light guide rod 7. It is extremely easy to join the light guide rod 7 and the connector 9 together, and since a strong seal is possible, high airtightness can be obtained.

FIG. 3 shows a modification of FIG. 2.

The idea of the present invention is to obtain high airtightness by brazing the light guide rod and the airtight container using the two connecting parts, so the ring for fixing the light guide rod and the connector used for the airtight container are can also reverse the selection. That is, as shown in FIG. 3, the light guide rod 7 is directly connected to the connector 9a with a sealing material 14, and the insulating ring 1 of the airtight container has a fixed ring 13a with the insulating ring 1 through which the light guide rod 7 passes. In this method, the connector 9a and the fixed ring 13a are brazed together with the metal brazing material 15. In other words, the thing to which the light guide rod is fixed in advance can be a connector or just a connecting ring, and if you choose one of them, it will be necessary to select one, but the other side to be connected to it will be different. This means that it is sufficient to have an inverse correspondence relationship. Even in this case, the assembly method and airtight effect are exactly the same as in the above case.

As described above, according to the present invention, the light guide rod is the first
The light guide rod itself is connected to a fixed ring or connector that is a connecting member, and can be handled as an integrated individual component, and the light guide rod itself has a sealing part, making it easy to assemble the semiconductor photodetector. This has the advantage that the relative positions of the device components can be determined in the most favorable manner. Furthermore, the present invention uses a soldering method to achieve airtightness, unlike conventional mechanical rules that maintain airtightness by tightening screws, so the position of the light guide rod does not change even during long-term use. There are no factors at all. Therefore, it shows a remarkable effect in improving not only high airtightness but also the electric characteristics and reliability inherent to the semiconductor light-receiving element.

The present invention has been explained using a flat-type light-igniting Zyristor as an example, but it goes without saying that the same applies to a stud-type light-igniting Zyristor, and it is applicable to all semiconductor devices that operate by optical signals. can.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional light-igniting Zyristor.
FIG. 2 is a sectional view of the seal portion according to the present invention. FIG. 3 is a sectional view of a modified example. 1...Insulating ring, 4...Light receiving part, 5...Semiconductor element, 7...Light guide bar, 9+9a...Fixing ring, 13, 13a...Connector, 14...Seal removal,
15...Metal brazing material.

Claims (1)

[Scope of Claims] 1) A semiconductor light-receiving element that guides light from a light source outside the airtight container to a light-receiving portion of a semiconductor element provided in the airtight container via a light guide, the semiconductor light-receiving element comprising an annular groove fixed to the light guide. 1. A semiconductor light-receiving device, characterized in that a first connecting portion is soldered to a second annular connecting member provided on the outer wall of the airtight container. 2. In the light receiving element according to claim 1, 1. A semiconductor light receiving element characterized in that a connector is used for either one of the second connecting members.