Semiconductor laser device and optical pickup device

Details Semiconductor laser device and optical pickup device Semiconductor laser device and optical pickup device

2005-07-26

2008-08-19

Huber, Paul (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112050, C369S121000

Reexamination Certificate

active

07414949

ABSTRACT:
A semiconductor laser device includes: a semiconductor laser chip which is composed of a semiconductor substrate and a plurality of semiconductor layers stacked on an element formation face of the semiconductor substrate and which outputs an irradiation light for irradiating an optical disk; and a light receiving element which receives the irradiation light reflected by the optical disk as a feedback light. The semiconductor laser chip includes on one face thereof an electrode facing an optical element and is fixed in a package so that at least one of sub-beams reflected by the optical disk is incident on the one face. A chip exposing portion for exposing a region of the one face where the sub-beam is incident is formed in the electrode.

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Extended European Search Report issued in corresponding European Patent Application No. EP 05 01 6454, dated Oct. 5, 2006.

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