JPH05152607A - Structure for mounting optical module - Google Patents

Abstract

PURPOSE:To provide a highly noise-proof optical module fixed enough to a print-circuit board. CONSTITUTION:In a structure for mounting an optical module having in its inside an optical operative-element 2 fastened on a conductive optical connector 1, provided is a conductive fixation member 8 wherein one end part is fixed on the conductive optical connector 1 and the other end part is fixed to a print- circuit board 9, and connected are electrically the conductive optical connector 1 and a ground 9g of the print-circuit board 9 with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure in which an optical module having an optical actuation element fixed to a conductive optical connector therein is attached to a printed circuit board.

[0002]

2. Description of the Related Art A conventional optical module is shown in FIG.
As shown in (b), the optical actuating element 2 incorporated in the metallic optical connector 1, the electronic circuit component 4 fixed on the island 3a of the lead frame 3, and the like are held inside the casing 5, A lead pin 3b is bent and extended at a substantially right angle on the outer side of 5 to form an external terminal. This case 5
A pin fixing member 7 to which a metal stud pin 6 is fixed by soldering is fitted in the periphery of, and the optical module is fixed on a printed circuit board (not shown) by the metal stud pin 6.

[0003]

According to the conventional optical module, the pin fixing member 7 is simply fitted into the outer periphery of the housing 5, so that when an external force acts in the longitudinal direction of the optical connector 1, the pin fixing member 7 is fixed. The member 7 had a drawback that it could easily fall out of the housing 5.

Further, the noise applied to the metallic optical connector 1 or the noise generated by the photoelectric conversion of the light actuating element 2 flows to the electronic circuit component 4 and flows to the ground of the printed circuit board via the lead pin 3b. However, there is a problem in noise resistance due to the influence of noise on the electronic circuit composed of electronic circuit parts.

Therefore, an object of the present invention is to provide a mounting structure for an optical module which is sufficiently fixed to a printed circuit board and has good noise resistance.

[0006]

In order to achieve the above object, the present invention provides a structure in which an optical module having an optical actuation element fixed to a conductive optical connector therein is attached to a printed circuit board. A conductive fixing member having a second end fixed to a printed circuit board and attached to the conductive optical connector, wherein the conductive optical connector and the ground portion of the printed circuit board are electrically connected to each other. And

[0007]

According to the optical module mounting structure of the present invention, the noise applied to the optical connector flows directly to the ground portion of the printed circuit board without passing through the electronic circuit and the lead pins.

[0008]

An embodiment of the present invention will be described below with reference to the accompanying drawings. In the description, the same elements will be denoted by the same reference symbols, without redundant description. FIG. 1 is a sectional view schematically showing an optical module according to an example.

The optical module according to the present embodiment includes a light emitting element, a light receiving element, and other such optical actuating elements 2 built in a metallic optical connector 1, electronic circuit parts 4 constituting electronic circuits such as a transmitting circuit and a receiving circuit, and the like. The housing 3 holds the island 3a of the lead frame 3 on which the electronic circuit component 4 is mounted. A lead pin 3b is arranged on the opposite side of the metal optical connector 1 with the island 3a interposed therebetween, and an end portion of the lead pin 3b is bent and extended by approximately 90 degrees to form an external terminal of the optical module.

A metal stud pin (conductive fixing member) 8 is fixed to the metal optical connector 1 by soldering or the like, and the metal stud pin 8 is partially exposed to expose the housing. The optical connector 1, the electronic circuit component 4, and the lead frame 3 are held by 5. The exposed metal stud pin 8 is fixed to the ground portion 9g of the printed circuit board 9, so that the optical connector 1 and the ground portion 9 are connected.
g is electrically connected via a metal stud pin 8. Here, the metal stud pin 8 may be integrally formed of the same material as the optical connector 1.

Since this embodiment is constructed as described above, the stud pin 8 is provided inside the housing 5 in the optical connector 1.
Since it is fixed integrally with, there is no problem that the stud pin 8 falls out of the optical module due to external force.
The holding force for the printed circuit board 9 is strengthened.

Further, the noise applied to the optical connector 1 does not go through the electronic circuit and the lead pin 3b, but the stud pin 8
Since the current flows to the ground portion 9g of the printed circuit board 9 through, the path to the ground portion 9g is shortened, and the noise resistance of the optical module is improved.

The present invention is not limited to the above embodiment. For example, the conductive fixing member of the present invention may have a function of fixing the optical module to the printed circuit board and a function of connecting the optical connector and the ground of the printed circuit board to each other, and is not limited to the metal stud pin.

Further, in the above embodiment, the optical module holding a part of the optical connector, a part of the lead frame and the electronic circuit parts inside the housing is mentioned as an example, but these parts are integrated by the resin member. It can also be applied to a molded optical module.

[0015]

According to the present invention, since the conductive optical connector is directly connected to the ground of the printed circuit board, the noise resistance of the optical module can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view schematically showing a structure of an optical module that can be used in an optical module mounting structure according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view schematically showing a state in which a stud pin is attached to a conventional optical module and a passage path of noise applied to an optical connector.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Metal optical connector, 2 ... Optical actuation element, 3 ... Lead frame, 4 ... Electronic circuit component, 5 ... Housing, 6 ... Metal stud pin, 7 ... Pin fixing member, 8 ... Metal stud pin (conductive) Fixing member), 9 ... Printed circuit board.

Claims (1)

[Claims] 1. A structure in which an optical module having an optical actuation element fixed to a conductive optical connector therein is attached to a printed circuit board, wherein one end is attached to the conductive optical connector and the other end is the printed circuit. An optical module mounting structure comprising a conductive fixing member fixed to a substrate, wherein the conductive optical connector and the ground of the printed circuit board are electrically connected to each other.