Light receiving amplification element

Details Light receiving amplification element Light receiving amplification element

2006-02-21

2006-02-21

Edun, Muhammad (Department: 2655)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044370, C369S044290, C369S044350, C369S124010

Reexamination Certificate

active

07002881

ABSTRACT:
The object of the invention is to provide a light receiving amplification element applicable to an optical pickup apparatus comprising a semiconductor two-wavelength laser element and one condensing lens. The light receiving amplification element is provided with a plurality of light receiving portions corresponding to different wavelengths, a plurality of trans-impedance type amplifiers connected to the light receiving portions according to the different wavelengths and adaptable to the different wavelengths and switching portion for switching output from the trans-impedance type amplifier according to each of the wavelengths.

REFERENCES:
patent: 6243336 (2001-06-01), Schell et al.
patent: 6910174 (2005-06-01), Keeler
patent: 2001-202646 (2001-07-01), None
patent: 2001-307362 (2001-11-01), None

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