JP2009016486A - Optical communication equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excellent shielding effect against external noise. <P>SOLUTION: A shielding plate 10 is arranged on a transparent resin package 9 housing a light emitting and receiving means inside a receptacle 12 and on the loading surface side of the light emitting and receiving means. In an optical passing port 14 provided to the shielding plate 10, the opposing state of an optical plug 4 fitted to the receptacle 12 to the light emitting and receiving means is formed, and a ferrule 16 that the optical plug 4 has and the shielding plate 10 are brought into contact with each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical communication device, and in particular, by fitting an optical plug holding an optical fiber to a receptacle holding a transparent resin package containing a light emitting / receiving element and a light emitting / receiving means such as a driving IC thereof, The present invention relates to a structure for preventing external noise in an optical communication device that forms a coupling state with an element.

For example, as shown in FIGS. 6 and 7, this type of optical communication device includes an optical plug 4 fitted into a receptacle 3 having a transparent resin package 2 in which a light emitting / receiving element 1 is accommodated, and a transparent resin. An electric signal is obtained from the electric terminal 5 protruding from the package 2.
Conventionally, in order to prevent malfunction due to external noise, for example, carbon fiber or conductive fiber is mixed in a receptacle 3 made of a synthetic resin, and a fixed terminal 6 made of a conductive material is press-fitted into the receptacle 3 so that the fixed terminal 6 is mounted on the mounting substrate. The shield effect is obtained by connecting to GND (ground).

  Further, in Patent Document 1, a photoelectric conversion element is housed in a shield case, the shield case is held in a receptacle, and an opposing state is formed with an optical plug coupled to the receptacle through a lighting port provided in the shield case. The structure which acquires the shielding effect by this is disclosed. Patent Document 2 discloses a configuration that obtains a shielding effect by accommodating a plastic package in a shielding case.

JP-A-6-43343 JP 2000-357803 A

  However, in the above-mentioned conventional method of mixing conductive fibers into a synthetic resin receptacle, the expected shielding effect can be obtained from variations in the amount of conductive fibers mixed in and resistance value fluctuations due to bias of the conductive fibers in the synthetic resin. It may not be obtained. In addition, applying a surge directly to a receptacle containing this type of conductive fiber induces a system communication error due to malfunction of other components mounted on the same board as the receptacle, and in the worst case destroys other components. There is also a case.

Further, the photoelectric converter described in Patent Document 1 has a structure in which the upper surface of the shield case serves as a lid that forms a part of the receptacle, and further, the upper portion of the shield terminal is exposed. Concerned.
In addition, the optical transmission module described in Patent Document 2 is required to obtain the maximum coupling between the optical fiber and the light emitting and receiving element, the sheet metal bending accuracy of the shield case, the assembly accuracy of the shield case and the plastic package, and the relationship between them and the receptacle. Assembling accuracy is greatly involved and has limitations.

  An object of the present invention is to provide an optical communication device capable of obtaining an excellent shielding effect against external noise.

  The present invention relates to an optical communication device in which a light emitting / receiving unit is housed in a transparent package, and an optical plug having an optical fiber with a ferrule is fitted into a receptacle holding the package to form a coupled state with the light emitting / receiving unit In the package, a shield plate having a light transmission port is disposed on the surface side where the light emitting / receiving unit is mounted, and the optical plug fitted to the receptacle at the light transmission port and the light emitting / receiving unit are formed to face each other. The optical communication device is configured to extend a fixed terminal on the shield plate and project from the lower side of the receptacle.

In a preferred example, the ferrule and the shield plate are in contact with each other in a coupled state in which an optical plug having an optical fiber with a ferrule is fitted to the receptacle.
Preferably, the periphery of the portion where the shield plate and the ferrule are in contact with each other is thinned by sheet metal processing to maximize the coupling state with the optical fiber.

Preferably, the shield plate is formed by bending a sheet metal, and a fixed terminal is formed by extending a part of the sheet metal.
Preferably, the transparent resin package, the shield plate, and the fixed terminal are press-fitted from the lower side of the receptacle and are not exposed to the upper and side surfaces of the receptacle.

  According to the present invention, an excellent shielding effect against external noise can be obtained by mounting a shield plate having a predetermined structure on a receptacle.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
In the optical communication device shown in FIG. 1, 8 is a light emitting / receiving device such as a semiconductor laser or a photodiode and a light emitting device driving IC, a light emitting / receiving device such as a receiving IC, 9 is a package made of a transparent resin for housing the light emitting / receiving device 8, Reference numeral 10 denotes a shield plate, 11 denotes a fixed terminal extending from the shield plate, and 12 denotes a receptacle for holding the transparent resin package 9, the shield plate 10 and the fixed terminal 11.

  The light emitting / receiving unit 8 is a bare chip, and is configured as a transparent resin package 9 that is sealed with a transparent synthetic resin or the like. The transparent resin package 9 has a flat and rectangular structure as a whole, and the electric terminals 13 protrude. The shield plate 10 is flat with a sheet metal punched from a metal sheet material, and has two light-transmitting ports 14 formed in the center. Further, the fixed terminal 11 is extended by bending at right angles from the left and right side edges of the shield plate 10. The fixed terminal 11 can be extended according to the mounting position of the mounting board.

  The receptacle 12 is a synthetic resin molded product in which conductive fibers and the like are not mixed. As shown in FIG. 2, a package chamber 17 for storing a transparent resin package, a shield plate 10 and a fixed terminal 11 are provided below the receptacle 12. A shield chamber 18 to be accommodated is formed.

  As shown in FIG. 3, the transparent resin package 9, the shield plate 10, and the fixed terminal 11 are accommodated in the receptacle 12 by being press-fitted into the package chamber 17 and the shield chamber 18 from the lower side of the receptacle 12 to form a facing state. It should be noted that, in the case of a usage state in which a problem due to surge application cannot occur, it does not prevent the receptacle 12 from being mixed with conductive fibers or the like. An adhesive may be used to securely fix the transparent resin package 9 housed in the receptacle 12, the shield plate 10, and the fixed terminal 11.

  In addition, the transparent resin package 9 and the inner leads 19 protruding from the upper surface of the transparent resin package 9, the shield plate 10, and the fixed terminals 11 are not exposed from the upper surface and side surfaces of the receptacle 12. That is, even if a surge is directly applied to the receptacle 12, the above-described problem is not induced. Furthermore, as the material of the shield plate 10, an optimum material can be selected according to the noise frequency, noise intensity, etc. of the external noise.

FIG. 4 shows the relationship between the optical plug and the shield plate. The ferrule 16 of the optical fiber with a ferrule possessed by the optical plug 15 and the light emitting / receiving means 8 housed in the shield plate 10 and the transparent resin package 9 are fitted, and the shield plate 10 and the ferrule 16 are arranged in contact with each other. ing. This can be easily achieved by adopting a springback function for the ferrule 16. In particular, when the material of the ferrule 16 is metal, it is known that the frequency of inducing malfunction due to external noise is high, and the improvement effect is great.
Further, when the gap between the end face of the ferrule 16 and the light emitting / receiving means 8 is increased by the thickness of the sheet metal of the shield board 10 and maximum coupling cannot be obtained, the shield board 10 is attached to the end face of the ferrule 16 as shown in FIG. It is possible to improve the bonding state by thinning the periphery of the part that contacts with sheet metal processing.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the shape, structure, material, and the like of the receptacle, the shield plate, the fixed terminal, and the optical plug in the above embodiment. It should be noted that malfunctions due to external noise are mainly observed in the receiver, and the transmitter does not prevent processing of the light passage opening 14 larger than the diameter of the ferrule 16.

It is a front view which shows the structure of the optical communication device in one Example. It is a bottom view of the receptacle in one Example. It is a sectional side view which shows the structure of the optical communication device in one Example. It is a sectional side view which shows the relationship between the optical plug and shield board in one Example. It is a (A) side sectional view and (B) front view showing a shield board in one example. It is a front view which shows the conventional optical communication apparatus. It is a sectional side view which shows the conventional optical communication device.

Explanation of symbols

8: Light emitting / receiving means, 9: Transparent resin package, 10: Shield plate, 11: Fixed terminal, 12: Receptacle, 13: Electrical terminal, 14: Light passage, 15: Optical plug, 16: Ferrule, 17: Package room , 18: shield room, 19: inner lead.

Claims (5)

  In an optical communication device in which a light emitting / receiving unit is housed in a transparent package, and an optical plug having a ferrule-attached optical fiber is fitted to a receptacle holding the package to form a coupled state with the light emitting / receiving unit, A shield plate having a light transmission port is disposed on the surface side of the package on which the light emitting / receiving unit is mounted, and the optical plug fitted to the receptacle at the light transmission port is opposed to the light emitting / receiving unit. And an optical communication device characterized in that a fixed terminal is extended on the shield plate so as to protrude from the lower side of the receptacle.   2. The optical communication device according to claim 1, wherein the ferrule and the shield plate are in contact with each other in a coupled state in which the optical plug having the optical fiber with the ferrule is fitted to the receptacle.   3. The optical communication device according to claim 1, further comprising a structure in which a periphery of a portion where the shield plate and the ferrule are in contact with each other is thinned by sheet metal processing to maximize a coupling state with the optical fiber.   4. The optical communication device according to claim 1, wherein the shield plate is formed by bending a sheet metal, and the fixed terminal is formed by extending a part of the sheet metal.   5. The structure according to claim 1, wherein the package made of transparent resin, the shield plate, and the fixed terminal are press-fitted from a lower side of the receptacle and are not exposed to an upper surface and a side surface of the receptacle. Optical communication equipment.

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