# US 8,541,736 B2 · Photoelectric conversion module having dual circuit board and dual dust proofing member

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- Number: US 8,541,736 B2
- Document ID: US8541736B2
- Status: Granted
- Kind: B2
- Application number: 13/067,587
- Filed: 2011-06-10
- Published: 2012-01-26
- Granted: 2013-09-24
- Earliest claimed: 2010-07-20
- Assignees: Hitachi Cable, Ltd.
- Applicants: Akiyoshi Baba; Yoshiaki Ishigami
- Inventors: Akiyoshi Baba; Yoshiaki Ishigami
- Web page: https://patentgrep.com/patent/US8541736B2

## CPC

- G02B 6/4201: {Packages, e.g. shape, construction, internal or external details}
- H05K 1/144: {Stacked arrangements of planar printed circuit boards}
- H05K 1/117: {Pads along the edge of rigid circuit boards, e.g. for pluggable connectors}
- H05K 2201/042: Stacked spaced PCBs; Planar parts of folded flexible circuits having mounted components in between or spaced from each other
- H05K 2201/2036: Permanent spacer or stand-off in a printed circuit or printed circuit assembly
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

A photoelectric conversion module includes a housing including a first wall and a second wall parallel to each other, a first circuit board and a second circuit board arranged between the first wall and the second wall, a spacer disposed between the first circuit board and the second circuit board, a first dust proofing member for sealing a gap between the first wall and the first circuit board and a gap between the spacer and the first circuit board, and a second dust proofing member for sealing a gap between the second wall and the second circuit board and a gap between the spacer and the second circuit board. The first circuit board includes a first holding portion for holding the first dust proofing member. The second circuit board includes a second holding portion for holding the second dust proofing member.

## Claims

### Claim 1

A photoelectric conversion module, comprising:
a housing including a first wall and a second wall parallel to each other, and an open end defined by respective ends of the first wall and the second wall;
a photoelectric conversion element arranged in the housing;
an integrated circuit arranged in the housing, the integrated circuit to be electrically connected with the photoelectric conversion element;
a first circuit board arranged between the first wall and the second wall, the first circuit board being parallel thereto, and including adjacent to the open end an end that is connectable to an external device;
a second circuit board arranged between the first wall and the second wall, the second circuit board being parallel thereto, and including adjacent to the open end an end that is connectable to the external device;
electrode terminals provided at the ends of the first circuit board and the second circuit board respectively, the electrode terminals being electrically connected to the integrated circuit;
a spacer disposed between the first circuit board and the second circuit board, the spacer including two pillars for defining a distance between the first circuit board and the second circuit board, and a beam extending between the pillars;
a first dust proofing member for sealing a gap between the first wall and the first circuit board and a gap between the spacer and the first circuit board; and
a second dust proofing member for sealing a gap between the second wall and the second circuit board and a gap between the spacer and the second circuit board,
wherein the first circuit board further includes a first holding portion for holding the first dust proofing member, while the second circuit board further includes a second holding portion for holding the second dust proofing member.

### Claim 2 (depends on 1)

The photoelectric conversion module according to claim 1, wherein
the first dust proofing member and the second dust proofing member are each formed of a ring shaped elastic material, and
the first holding portion and the second holding portion comprise a pair of notches formed at both side edges of the first circuit board and a pair of notches formed at both side edges of the second circuit board, respectively.

### Claim 3 (depends on 1)

The photoelectric conversion module according to claim 1, wherein
the spacer includes a first groove to receive a portion of the first dust proofing member, and a second groove to receive a portion of the second dust proofing member.

### Claim 4 (depends on 1)

The photoelectric conversion module according to claim 1, wherein
the first wall includes a third groove to receive a portion of the first dust proofing member, and
the second wall includes a fourth groove to receive a portion of the second dust proofing member.

### Claim 5 (depends on 1)

The photoelectric conversion module according to claim 1, wherein
the first dust proofing member and the second dust proofing member are each formed of a foaming material.

### Claim 6 (depends on 1)

The photoelectric conversion module according to claim 1, wherein
the first dust proofing member and the second dust proofing member each include a body, and a deformable portion that is more compressed or deformed than the body.

### Claim 7 (depends on 1)

The photoelectric conversion module according to claim 1, wherein
the first dust proofing member and the second dust proofing member are each formed of an ethylene propylene rubber being not vulcanized with sulfur or a silicon rubber containing a reduced low molecular siloxane component.