JPH0322727Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a shielding sleeve for a light emitting/receiving connector.

(Prior art and its problems) When transmitting information using optical fiber lines,
On the transmitting side, the light emitted from the light emitting element that exchanges electrical signals into optical signals is coupled to an optical fiber line.
On the receiving side, an optical signal is coupled through an optical fiber to a light receiving element, and the optical signal is converted into an electrical signal.

Therefore, a light emitting/receiving connector as shown in the sectional view shown in FIG. 1 is generally used. This connector includes a light emitting/receiving part A consisting of a supporting flange ferrule 2 holding an optical fiber 1 in the center, a coil spring 4 supporting the ferrule on a body 3, a spring bearing sleeve 5 fixed to the body 3, etc., and a converting part. B, that is, so that the light emitting surface or the light receiving surface 7a is exposed by the window 6a.
It consists of a conversion section B consisting of a light emitting element or a light receiving element 7 housed and fixed in a body 6. Then, as shown in the figure, by inserting the ferrule 2 into the sleeve 6b of the body 6, the exposed end surface of the optical fiber 1 and the exposed end surface of the light emitting or light receiving element 7 are made to face each other while maintaining a uniform close spacing. It is something that connects. Note that 8 and 9 are housings,
10 is a connection terminal of the light emitting or light receiving element 7.

By the way, when using this light emitting/receiving connector, the body 6 is grounded and shielded, and at the same time, when connecting various external circuits such as oscillators and amplifiers to the light emitting or light receiving element 7, shielded wires are used to prevent external electromagnetic waves. Efforts are being made to prevent problems caused by noise as much as possible. However, in general, the current value handled on the electrical signal side is extremely weak on the order of microamperes, and moreover, the current value handled on the electrical signal side is extremely weak, and moreover, the connection terminal 10 from the light emitting or light receiving element 7 of the body 6
The drawer section 6C is open. As a result, the first
In the conventional device shown in the figure, when the power of electromagnetic waves is large, noise interference cannot be prevented and there is a high possibility that malfunctions will occur. In order to prevent this, for example, as shown in the cross-sectional view in FIG. A method for doing this can be considered using the same concept as for conventional coaxial connectors that handle high frequencies. However, this method makes the light emitting/receiving connector expensive, which is disadvantageous for consumer connectors that are required to be inexpensive, even if the transmission loss is a little large and the performance is inferior, for example, for short-distance information transmission. It is.

The purpose of the present invention is to provide a shield structure that is inexpensive and extremely easy to install, and the details thereof will be explained next with reference to the drawings.

[Structure of the idea]

(Means for solving the problem) FIGS. 3a and 3b are a perspective view of a shielding sleeve and a perspective view of a body showing an embodiment of the present invention,
Figure 4 is a sectional view of the main parts showing the state in which the shielding sleeve is installed (the same symbols as in Figure 1 indicate the same parts)
The features of the present invention are as follows.

That is, when the present invention is inserted into the body 6 for housing a light emitting element or a light receiving element,
A mounting split sleeve 12 having an outer diameter larger than the inner diameter of the body 6, which generates mounting spring force while reducing its diameter at point a, and a connecting piece 1 in a part thereof.
3, that is, a shielding sleeve comprising a rectangular shielding box 14 that covers the opening 6b of the body 6 and is large enough to cover almost the entire length of the bent connection terminal 10. form 15.

On the other hand, the end surface of the rectangular shielding box 14 is abutted against the drawer side end surface of the connection terminal 10 of the body 6 that accommodates the light emitting element 7, etc., as shown in FIG. A closed rectangular abutting end surface portion 6d is formed. Then, as shown in FIG. 4, pass the bent portion 10 of the connecting terminal 10 through the split 12a and insert the split sleeve 12 until the end surface 14a of the shield square box 14 on the split sleeve 12 side contacts the abutting end surface 6b of the body 6. It is characterized by shielding by pushing.

(Operations and Effects) With the above configuration, the lower end opening 14b of the rectangular shielding box 14 is located at right angles to the open drawer portion 6C of the body 6, and therefore the drawer portion 6C is substantially radio-sensitive. It is equivalent to being blocked, and a shield effect is exerted. Moreover, the shielding sleeve 15 of the present invention is a flat plate having a T-shaped shielding rectangular box forming part 14 integrally connected by a rectangular split sleeve forming part 12 and a connecting part 13, as shown in FIG. Punch it out, bend it at the dotted line in the figure,
It can also be easily formed by rolling it. Therefore, it is extremely inexpensive compared to the conventional shielding sleeve described above with reference to FIG. It has the advantage that it can be installed easily and securely by simply pushing it in. Therefore, according to the present invention,
It is possible to provide a shielding sleeve that meets the demand for lower prices.

Although the present invention has been described above, in order to facilitate attachment of the split sleeve 12 to the body 6, for example, as shown in FIG. Figure 6b
There is a rounded part 6e inside the open end of the body 6 as shown in FIG.
may be provided.

[Brief explanation of drawings]

Figures 1 and 2 are explanatory diagrams of conventional connectors;
Figures 3a and 3b show an embodiment of the present invention, in which figure a is a perspective view of the shield box and figure b is a perspective view of the body. FIG. 4 is a cross-sectional view of a main part showing the state in which the shielding sleeve is attached, FIG. 5 is a diagram showing an example of manufacturing the shielding sleeve, and FIGS. 6a and 6b are views of a modification of the present invention. A... Light emitting/receiving part, 1... Optical fiber, 2... Ferrule, 3... Body, 4... Spring, 5... Spring bearing sleeve, B... Conversion part, 6... Body,
6a...Window, 6b...Sleeve for ferrule insertion, 6c...Connection terminal drawer portion, 6d...Sleeve abutting end face for shield, 6e...Rounded portion,
7... Light emitting or light receiving element, 8, 9... Housing, 10... Connection terminal, 10a... Bent portion thereof,
12... split sleeve for installation, 12'... split sleeve forming part, 13... connecting piece, 13'... connecting plate,
14... Rectangular box for shielding, 14'... Forming part thereof, 15... Sleeve for shielding.

Claims (1)

[Scope of utility model registration request] A square box forming part for a T-shaped shield,
A rectangular shielding box with an open bottom surface is obtained by bending a plate having rectangular split sleeve forming parts connected at some parts, and a cylindrical split sleeve with an outer diameter larger than the inner diameter of the body. A shielding sleeve is formed, and the shielding sleeve is inserted into the connector body until it abuts against the end abutting surface provided on the connecting terminal drawer portion of the connector body to perform shielding. Shield structure of light transmitting and receiving connector.