Coherent light generators – Particular temperature control – Heat sink
Reexamination Certificate
2005-01-18
2005-01-18
Leung, Quyen (Department: 2828)
Coherent light generators
Particular temperature control
Heat sink
C372S043010
Reexamination Certificate
active
06845112
ABSTRACT:
A stem is formed by fixing two leads to a base having a planar shape that is substantially circular to be remote from one diameter thereof by a specified distance and by providing a heat sink onto one surface side of the base to have a surface that is parallel to the two leads and that is perpendicular to the base. A laser chip is mounted onto one surface of the heat sink and a periphery thereof is covered by a cap. The heat sink is fixedly attached such that an emitting portion of the light of the laser chip becomes in center of the base. It is accordingly possible to obtain a semiconductor laser of an arrangement having a small outer diameter and that may be easily manufactured at low cost while increasing the size of the heat sink for improving the heat radiation properties even if the laser chip has a large chip size and a large heat generating in a high output laser chip, and accordingly an optical pickup of thin type.
REFERENCES:
patent: 4686678 (1987-08-01), Ohta et al.
patent: 5485479 (1996-01-01), Kitamura et al.
patent: 5878069 (1999-03-01), Kamibayashi et al.
patent: 2001-111152 (2001-04-01), None
Muranishi Masayoshi
Yamamoto Takeshi
Arent & Fox PLLC
Leung Quyen
Rohm & Co., Ltd.
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