Light-receiving semiconductor device and optical pickup device

Details Light-receiving semiconductor device and optical pickup device Light-receiving semiconductor device and optical pickup device

2007-04-09

2009-06-23

Epps, Georgia Y (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C250S2140AG, C369S044110, C356S423000

Reexamination Certificate

active

07550700

ABSTRACT:
According to an embodiment of the present invention, a semiconductor device used in an optical disk device driving an optical disk, includes: an optical pickup device detecting an optical signal irradiated to the optical disk and converting the detected optical signal into an electric signal to output the electric signal; and a light amount detecting circuit amplifying the electric signal output from the optical pickup device, the optical pickup device including a plurality of light receiving elements different in receiving sensitivity and the light amount detecting circuit including at least one amplifier or two or more amplifiers of the same amplifying characteristics.

REFERENCES:
patent: 4162399 (1979-07-01), Hudson
patent: 6710915 (2004-03-01), Itoh
patent: 2000-258244 (2000-09-01), None
patent: 2001-209959 (2001-08-01), None
patent: 2005-63543 (2005-03-01), None
patent: 10-2004-0095079 (2004-11-01), None
patent: 10-2005-0067650 (2005-07-01), None
Korean Office Action dated Nov. 6, 2008 with Partial English-Language Translation of the Japanese-Language Translation.
Korean Office Action dated May 20, 2008 with a partial English translation.

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