Optical pickup and optical disc drive device

Details Optical pickup and optical disc drive device Optical pickup and optical disc drive device

2006-01-17

2006-01-17

Assaf, Fayez G. (Department: 2872)

Optical: systems and elements

Diffraction

From grating

C359S569000, C359S015000, C359S019000, C369S112030, C369S112090, C369S112150, C369S112210

Reexamination Certificate

active

06987614

ABSTRACT:
This invention is an optical pickup device having a composite optical element (32) which has a first diffraction grating (45) for splitting a light beam emitted from a light source (31) into zeroth-order light, plus-first-order light and minus-first-order light, a second diffraction grating (46) for diffracting the optical path of a return light beam from an optical disc (2), and a split prism (47) arranged at a position where the minus-first-order light diffracted by the second diffraction grating (46) is incident and adapted for splitting the minus-first-order light into a plurality of light beams. It also has a light receiving unit (35) for acquiring a focusing error signal FE by receiving each return light beam split by the split prism (47) and for acquiring a tracking error signal by receiving return light beams from the optical disc (2) of the plus-first-order light and the minus-first-order light split by the first diffraction grating (45).

REFERENCES:
patent: 5060212 (1991-10-01), Fujita et al.
patent: 5231620 (1993-07-01), Ohuchida
patent: 5391865 (1995-02-01), Kurata et al.
patent: 5636190 (1997-06-01), Choi
patent: 5742572 (1998-04-01), Tezuka et al.
patent: 5745265 (1998-04-01), Hasegawa et al.
patent: 6208596 (2001-03-01), Imai et al.
patent: 0309689 (1989-04-01), None
patent: 0467303 (1992-01-01), None
patent: 0539354 (1993-04-01), None
patent: 0583036 (1994-02-01), None
patent: 63131338 (1988-06-01), None
patent: 4-219654 (1992-08-01), None
patent: 63-131338 (1998-06-01), None
patent: 11-185285 (1999-07-01), None

Affiliated with

Also associated with

Rating

Optical pickup and optical disc drive device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical pickup and optical disc drive device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical pickup and optical disc drive device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3534829