US Patent 7470885 Photodetector-amplifier circuit and optical pickup device

Patent 7470885 was granted and assigned to Panasonic on December, 2008 by the United States Patent and Trademark Office.

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Patent

Patent attributes

Current Assignee

Panasonic

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

74708850

Patent Inventor Names

Shinichi Miyamoto0

Hideo Fukuda0

Date of Patent

December 30, 2008

Patent Application Number

112160030

Date Filed

September 1, 2005

Patent Primary Examiner

‌

Seung C Sohn

Patent abstract

The present invention provides a photodetector-amplifier circuit capable of eliminating an influence of noise due to stray light entering a non-selected photodetector to stably select and switch a photodetector. The photodetector-amplifier circuit of the present invention comprises photodetectors 12 and 13. The photodetector 12 is connected via a switch 16 between an inverting input terminal of an operational amplifier 11 and GND, and is also connected via a switch 18 to a voltage source Vcc. The photodetector 13 is connected via a switch 17 to the inverting input terminal of the operational amplifier 11 and GND, and is also connected via a switch 19 to the voltage source Vcc.

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