Optical pickup having a diffraction grating and a hologram...

Details Optical pickup having a diffraction grating and a hologram... Optical pickup having a diffraction grating and a hologram...

2006-06-06

2006-06-06

Le, Que T. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C250S23700G

Reexamination Certificate

active

07057146

ABSTRACT:
The optical pickup of this invention includes a diffraction grating for dividing a light beam emitted from a semiconductor laser into a main beam, a precedent sub beam and a subsequent sub beam; a hologram element for dividing reflected light beams of the main beam, the precedent sub beam and the subsequent sub beam from an optical recording medium respectively into first through eighth main beams, first through eighth precedent sub beams and first through eighth subsequent sub beams; a main beam detector for receiving the first through eighth main beams; a precedent sub beam detector for receiving the first through eighth precedent sub beams; and a subsequent sub beam detector for receiving the first through eighth subsequent sub beams.

REFERENCES:
patent: 6512608 (2003-01-01), Ohyama
patent: 10-222853 (1998-08-01), None
patent: 2001-209060 (2001-08-01), None
patent: P2001-229573 (2001-08-01), None

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