JPH08136771A - Optical transmission module - Google Patents

Abstract

PURPOSE: To decrease the working man-hours for the external structure of a module and to obtain the module equivalent to the existing modules without impairing the intrinsic characteristics, such as noise resistance, by changing the fixing method by soldering, adhesive fixing, etc., to a fixing method by fitting of structural parts to each other. CONSTITUTION: A receptacle 1 is formed into a shape provided with projecting parts 1a, 1b on both side faces and the section thereof is formed into a T shape. A cover 6 is slid from behind a package 2 and is mated and fitted into holding-in parts 6a, 6b of a shape to hold projecting parts 1a, 1b of both side faces of the receptacle 1 in them. At this time, an L-shaped hook 7 at the endmost end of the cover 6 fits into a notched part 2a of the package 2 to fix the cover 6. The coupling part at the rear end is fixed with solder, etc., thereby, the fixing of the fitting part between the receptacle 1 and the cover 6 by the shape alone is made possible. As a result, the fixing points are decreased from previous 2 points to one point.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical transmission module, and more particularly to a unidirectional or bidirectional optical transmission module incorporating a light emitting element or a light receiving element.

[0002]

2. Description of the Related Art As a conventional transmitting or receiving unidirectional optical transmission module, there is, for example, a structure shown in JP-A-61-137111. This has a structure as shown in Fig. 2, and since the cover covers the upper part of the package, the fixing parts between parts are fixed by adhesive, soldering, screwing, etc. Was common.

[0003]

Originally, a cover used for an optical transmission module or the like is made of a conductive material, and is electrically shielded by making it the same potential as the back surface of the substrate, the receptacle, the GND terminal, and the like. The structure was adopted. As a result, the grounded conductor plays a role of blocking external noise, and a structure having excellent noise resistance can be realized. However, in order to obtain that characteristic, it was necessary to perform soldering or adhesive fixing when fixing to other parts.

In the fixing method using an adhesive, a great amount of time is required for assembling including the curing time of the adhesive. Furthermore, in terms of work environment, it is feared that a skilled worker will be adversely affected to some extent by the human body. Further, when the fixing method using screws is used, it is not possible to expect a shielding effect that brings about noise resistance because of mechanical contact.

An object of the present invention is to provide a structure which does not impair noise resistance without using these existing fixing methods more than necessary.

[0006]

In order to achieve the above object, in the present invention, first, as a means for fixing only the shape of a structural component, a conventional fixing method using an adhesive is used to cover an optical transmission module. The structure in which the element was fixed to the receptacle including the light emitting element or the light receiving element was deleted, and this portion was fixed by a component shape. The structure in which the cover and the main body were fixed at the two front and rear positions was made only at the one rear position, and the front adhesive fixing part was slid along the shape of the other structural component, and then the rear fixing part was completely soldered. .

[0007]

According to the above structure, the use of secondary adhesives can be reduced or eliminated by changing the conventional fixing method such as soldering or adhesive fixing to the fixing method using the shape of the structural component. . As a result, effects such as improvement in workability can be obtained while maintaining the same characteristics as those of the conventional one. In addition, the number of work steps can be shortened by reducing the number of fixing points by the fixing agent.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a perspective view of a unidirectional optical transmission module incorporating a light emitting element or a light receiving element as an embodiment of the present invention. Here, the receptacle 1 is fixed to the back surface grounding portion of the package 2 and is also grounded. Protrusions 1a and 1b are provided on the side surface of the receptacle 1. Further, the light emitting element 3, the light receiving element 4 and the like are incorporated in the receptacle 1 by a method such as adhesive fixing, press-fitting fixing, etc., and light is input and output from the connector surface 5 of the receptacle 1 via an optical fiber or the like. The receptacle 1 is mounted on the package 2 together with other mounted ICs 8 that perform photoelectric conversion and the like.

The cover 6 is shaped so as to cover only the portion fixed to the receptacle 1 from the three directions of the top surface, the side surface, and the bottom surface, and has the holding portions 6a and 6b having a shape that covers the receptacle protrusions 1a and 1b. , And others are in two directions: top and side. The last end of the cover 6 is L for soldering
A hook 7 having a V-shape is provided, and the hook 7 is aligned with the cutout portion 2a of the package 2 and can be soldered to the conductive portion on the back surface of the package 2.

A method of fixing the cover 6 will be considered using the structure of FIG. The receptacle 1 has a shape in which convex portions 1a and 1b are provided on both side surfaces, and its cross section is T-shaped. Here, the cover 6 is placed on the right side of FIG.
A holding portion 6a having a shape for holding the convex portions 1a and 1b on both side surfaces of the receptacle 1 by sliding the holding portion 6a,
Align with 6b and fit. At this time, L at the end of the cover 6
Since the cover 6 is fixed by fitting the character hook 7 into the notch 2a of the package 2, the receptacle 1 and the cover 6 can be fixed by fixing the joint at the rear end with solder or the like.
The fitting part between can be fixed only by each shape. FIG. 2 shows a perspective view of an optical transmission module using this structure after assembly.

On the other hand, FIG. 3 shows a perspective view of a conventional unidirectional optical transmission module in which a fixing method using solder, an adhesive or the like is used at a plurality of points. Here, the receptacle 9 is fixed to the back surface grounding portion of the package 10 and is also grounded. Similarly, the light emitting element 3, the light receiving element 4 and the like are incorporated in the receptacle 9 by a method such as adhesive fixing and press-fitting fixing, and light is input and output from the connector surface 5 of the receptacle 9 via an optical fiber or the like. The cover 11 has a shape that covers the upper surface, the side surface, the front surface, and the rear surface, and the two are coupled so as to be covered from the upper surface of the receptacle 9 having a shape having no convex portion. At this time, an I-shaped bending hook 12 is provided at the rear end of the cover 11, and this is folded back into an L-shape on the back surface of the package 10 having no cutout portion and similarly soldered. In the structure having no cutout portion, the same strength can be maintained by providing a wide hook or a plurality of hooks. Further, the fixing portion between the receptacle 9 and the cover 11 is also fixed by using an adhesive or the like.

From the above, by using the structure of FIG.
The number of fixing points can be reduced from one to two in the past. Workability can also be improved by eliminating the work of aligning the cover and bending the hook.

[0014]

According to the present invention, the fixing method between the cover and the parts such as the package and the receptacle is changed from the conventional fixing method such as soldering or adhesive fixing to the fixing method by fitting the shapes of the structural parts to each other. This makes it possible to reduce or eliminate the use of adhesives, etc., and it is possible to reduce the work man-hours while maintaining the performance of the module itself. By suppressing the use of adhesives, etc., the workability mainly on the environment is improved. And so on.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a perspective view after assembly of FIG.

FIG. 3 is a perspective view showing a structural example of a conventional unidirectional light transmission module.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Receptacle, 1a ... Right side convex part, 1b ... Left side convex part, 2 ... Package, 2a ... Notch part, 3 ... Light emitting element, 4 ... Light receiving element, 5 ... Connector surface, 6 ... Cover, 6a ... Right holding part , 6b ... Left side holding portion, 7 ... L-shaped hook, 8 ... Mounting IC.

Claims (1)

[Claims] 1. An optical transmission module comprising a receptacle for accommodating a light emitting element or a light receiving element and having an optical connector attached and detached, a package having a circuit portion for performing optical / electrical and electrical / optical conversion, and a cover. In the above, in each of the side surfaces of the receptacle, a convex portion with which the cover is fitted is provided, a notch portion is provided at an opposite end portion of the package to which the receptacle is attached, and a cover portion and an L-shaped hook portion are provided on the cover. A structure for fixing the cover by fitting the L-shaped hook portion of the cover and the cutout portion of the package with the holding portion of the cover and the convex portion of the receptacle, respectively. Optical transmission module.