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:
Jul. 30, 2002
Filed:
Sep. 27, 1999
Mitsuo Yanagisawa, Shiga, JP;
Hisaki Masuda, Shiga, JP;
Kyocera Corporation, Kyoto, JP;
Abstract
A package for housing a photosemiconductor element comprises a substrate having a mounting portion on a top surface of which a photosemiconductor element is mounted, a frame attached onto the substrate to surround the mounting portion and having a through hole on a side thereof, a cylindrical fixing member attached around the through hole of the frame and having a space therein for transmitting an optical signal, a light transmitting member attached to the cylindrical fixing member, for clogging the inside of the fixing member and a lid attached onto a top surface of the frame, hermetically sealing the photosemiconductor element. The fixing member is made of an alloy of from 40 to 60 wt % iron and from 40 to 60 wt % nickel. The coefficient of thermal expansion of the fixing member is about 9.5×10 /° C. (room temperature to 400° C.), which is close to that of the light transmitting member of amorphous glass, so that no thermal stress caused by the difference in coefficient of thermal expansion occurs in attaching the two. Because there is no thermal stress, which causes the double-refraction of the light excited by the photosemiconductor element, the excited light is received by the optical fiber member without being double-refracted in the light transmitting member, and the transmission efficiency of optical signal is enhanced.