Light receiving device for reading an optical medium with...

Details Light receiving device for reading an optical medium with... Light receiving device for reading an optical medium with...

2006-09-21

2008-07-29

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S201500

Reexamination Certificate

active

07405386

ABSTRACT:
Disclosed is a light receiving device for reading an optical medium compliant with any of different standards. The receiving device includes light receiving elements and an amplifier circuit. Each light receiving element is for receiving light reflected from an optical medium compliant with a different one of the standards and output a signal responsive to the received light. The amplifier circuit is for amplifying a signal derived from output of the light receiving elements. The signal amplified by the amplifier circuit is derived by subtracting an output signal of one of the light receiving elements that receives light from the optical medium from an output signal of the other light receiving elements.

REFERENCES:
patent: 3491351 (1970-01-01), Smaller et al.
patent: 5003525 (1991-03-01), Shimamoto et al.
patent: 2004-71058 (2004-03-01), None

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