Front photo detector having no gain selection switch,...

Details Front photo detector having no gain selection switch,... Front photo detector having no gain selection switch,...

2004-03-05

2009-12-22

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C250S21400C, C250S201500, C369S116000, C369S120000

Reexamination Certificate

active

07636286

ABSTRACT:
A front photo detector (FPD) of an optical pick-up for an optical recording and playing apparatus having no gain selection switch, a simplified configuration, an improved prevention of an abnormal operation due to an error in gain selection, and improved reliability. The front photo detector includes a photo diode unit, a current-voltage amplifying circuit, and a voltage amplifying unit. The photo diode unit outputs current proportional to the power of the light emitted from one of a plurality of laser diodes. The current-voltage amplifying circuit converts the current output from the photo diode unit into a voltage. The voltage amplifying circuit amplifies the voltage output from the current-voltage amplifying circuit by a predetermined gain.

REFERENCES:
patent: 5036505 (1991-07-01), Gleim
patent: 5247501 (1993-09-01), Hashimoto et al.
patent: 5966237 (1999-10-01), Sugaya et al.
patent: 5981936 (1999-11-01), Fujiie
patent: 6404709 (2002-06-01), Kouno
patent: 6504799 (2003-01-01), Yamashita et al.
patent: 6855919 (2005-02-01), Taguchi
patent: 7068933 (2006-06-01), Seong et al.
patent: 7415053 (2008-08-01), Hayashi
patent: 2002/0014849 (2002-02-01), Tsujikawa et al.
patent: 2005/0061954 (2005-03-01), Itoh et al.
patent: 2000-251300 (2000-09-01), None
patent: 2001-202646 (2001-07-01), None
Machine Translation of Japan Publication No. 20001202646 by Doi Takeshi in Jul. 27, 2001.
Machine Translation of Japan Publcation No. 2000251300 by Okamatsu Kazuhiko in Sep. 14, 2000.
Office Action issued by the Korean Patent Office on Mar. 29, 2005 in Korean Application No. 10-2003-0014477.

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