JPH05102529A - Sealing structure of electrooptical conversion module - Google Patents

Abstract

PURPOSE:To enable applying sealing agent of low viscosity to the sealing of a connection part of an element case for mounting a light emitting element and a light receiving element of an electrooptical conversion module and a cable case for fixing an optical fiber cable, and improve sealing quality. CONSTITUTION:At the connection part of an element case 1 and a cable case 2, a trench 4 is formed on the element case side, so as to surround the cable case 2. A mark 9 for showing the amount of sealing agent 8 is formed in the trench. Thereby the sealing agent can be made to flow into the trench, so that the sealing agent of low viscosity can be used and sealing quality is improved. By setting the mark so as to show the adequate amount of sealing resin, irregularities due to workers can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing structure for an electro-optical conversion module, and more particularly, to a case where a light emitting element, a light receiving element and an optical fiber cable are fixed to each other and an optical fiber cable fixing case and a light emitting element, a light receiving element mounting case. The present invention relates to a sealing structure for sealing a connection part.

[0002]

2. Description of the Related Art The structure of a conventional electro-optical conversion module is shown in FIG.
It is as shown in. (A) is an external perspective view thereof, and (b) is a top perspective view thereof.

In the figure, a cable case 2 containing a case 5 having an optical fiber 6 fixed thereto is connected to a flat surface of an element case 1 on which a light emitting element and a light receiving element 7 are mounted. The connecting surface between the element case 1 and the cable case 2 is sealed with a sealant 8.

The optical fiber fixing case 5 accommodating the optical fiber 6 is inserted into the element case 1 so that the light emitting element, the light receiving element 7 and the optical fiber 6 are coupled most efficiently.
The cable case 2 is finely adjusted in the X and Y axis directions and fixed. The X and Y axes are orthogonal axes on a plane perpendicular to the central axis of the cable 3.

Next, the gap between the element case 1 and the cable case 2 is sealed with a sealant 8.

In this conventional sealing structure for an electro-optical conversion module, if the viscosity of the sealant is too low, the sealant flows before it is cured, the sealing film becomes thin, and the sealing performance is impaired. If the viscosity is too high, it will not stick to the case and a slight gap will remain,
After all, the hermeticity is impaired, and it is difficult to adjust the viscosity of the sealant.

Further, it is difficult to visually determine the sealing property, and it is difficult to make a judgment in the inspection. Since it is difficult to make a visual judgment criterion, variations in operators and variations among operators depending on the skill level of the operators also occur, and thus reliability regarding sealing within a lot and between lots is impaired.

[0008]

It is an object of the present invention to use a sealant having a good adhesiveness and a low viscosity as a sealant between an element case and a cable case, thereby eliminating variations among operators. It is to provide a sealing structure for a module.

[0009]

According to the present invention, there is provided a sealing structure for an electro-optical conversion module, wherein the element case in which at least one of the light emitting element and the light receiving element is mounted and the cable case for fixing the optical fiber cable are joined to each other. It is characterized in that it has a groove for pouring a sealant, which is provided so as to surround the periphery of the cable case, on the case side, and a mark for indicating the amount of the sealant in the groove.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which (a) is a perspective view thereof and (b) is a top perspective view thereof. Incidentally, FIG.
The same parts as are indicated by the same reference numerals.

Case 1 mounting a light emitting element and a light receiving element 7
A groove 4 for pouring the encapsulant 8 into the element case 1 side is formed around the cable case 2 at a connection portion between the optical fiber cable 3 and the fixed cable case 2.

The optical fiber fixing case 5 is replaced with the element case 1
The optical fiber cable 3 so that the light emitting element, the light receiving element 7 and the optical cable 6 are best joined to each other.
After being finely adjusted in the axial direction and fixed, a sealant 8 having a low viscosity for improving the adhesion to the case is poured into the groove 4 up to the mark 9 and cured.

The mark 9 may indicate the minimum amount of the sealant 8 or may indicate the optimum amount.

2A is an external perspective view of another embodiment of the present invention, FIG. 2B is a top perspective view thereof, and FIGS.
The same parts as are indicated by the same reference numerals.

In order to form the groove 4 into which the sealant 8 is poured,
1 except that the ring 10 is provided on the upper surface of the element case 1.
Is the same as the embodiment described above.

[0017]

As described above, according to the present invention, in the electro-optical conversion module, it is used as a sealant for the connecting portion between the element case for mounting the light emitting element or the light receiving element and the cable case for fixing the optical fiber cable. Since the groove is provided so that it does not flow even if a low-viscosity sealant that improves the adhesion to the case is used, the sealability is not impaired, and the amount of sealant accumulated in the groove is set inside the groove. By adding a mark,
There is an effect that the variation of the operator is eliminated and the visual inspection is possible. Therefore, variations within lots and variations among lots are eliminated, and reliability is improved.

[Brief description of drawings]

1A is a perspective view of an embodiment of the present invention, and FIG. 1B is a top perspective view thereof.

FIG. 2A is a perspective view of another embodiment of the present invention, and FIG.
Is a top perspective view thereof.

3A is an external perspective view of a conventional electro-optical conversion module, and FIG. 3B is a top perspective view thereof.

[Explanation of symbols]

 1 Element Case 2 Cable Case 3 Optical Fiber Cable 4 Groove 5 Optical Fiber Fixing Case 6 Optical Fiber 7 Light-Emitting or Light-Receiving Element 8 Sealant 9 Mark 10 Ring

Claims (1)

[Claims] 1. A joint portion between an element case having at least one of a light emitting element and a light receiving element mounted thereon and a cable case for fixing an optical fiber cable so that the element case side surrounds the cable case. A sealing structure for an electro-optical conversion module, comprising: a groove for pouring a sealing agent provided therein; and a mark for indicating the amount of the sealing agent in the groove.