The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 26, 1995
Filed:
Mar. 08, 1993
Kohei Ishizuka, Machida, JP;
Masaya Nakata, Yokohama, JP;
Teruhisa Azumaguchi, Fujisawa, JP;
Junji Takeda, Fujisawa, JP;
Hiroki Irie, Yokohama, JP;
Atushi Miura, Fujisawa, JP;
Tamio Takeuchi, Yokohama, JP;
Tsutomu Kohno, Yokohama, JP;
Akisada Moriguchi, Ome, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A light transmission module is disclosed, having a light receiving element module, in which a photodiode and a coupling portion between the photodiode and a first optical fiber are hermetically sealed, and a light emitting element module, in which a laser diode driven by an electric signal and a coupling portion between said laser diode and a second optical fiber are also hermetically sealed. A two-sided print board is provided, on the two sides of which electric circuits for a transmitting system and a receiving system are mounted. The electric circuits for the transmitting and receiving circuits are; isolated electrically from each other, and are sealed in one body by molds, and accommodated in cases, together with the light receiving element module and the light emitting element module.