Optical pickup device having three light sources with a...

Details Optical pickup device having three light sources with a... Optical pickup device having three light sources with a...

2008-07-29

2008-07-29

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C250S201200

Reexamination Certificate

active

07405383

ABSTRACT:
An optical pickup device has three different light sources, a holographic element, beam splitters, and first and second photodetectors. The beam splitters each change an optical path of a light beam coming from the associated light source toward a recording medium and match an optical axis of the changed optical path with an optical axis passing through the holographic element and the first photodetector. Reflected light from the recording medium is divided into zero-order diffraction light and first-order diffraction light by the holographic element. The first photodetector receives the zero-order diffraction light and obtains an RF signal and a tracking error signal. The second photodetector receives the first-order diffraction light and obtains a focusing error signal.

REFERENCES:
patent: 7342868 (2008-03-01), Park et al.
patent: 2001-256667 (2001-09-01), None
patent: 2003-203378 (2003-07-01), None

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