Optical pick-up

Details Optical pick-up Optical pick-up

2008-08-21

2010-10-12

Tran, Thang V (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112080, C369S094000

Reexamination Certificate

active

07813252

ABSTRACT:
There is provided an optical pick-up including first to third light sources respectively emitting first to third light beams, a first coupling lens, and an objective lens formed to converge each of the first, second and third light beams onto the first, second and third optical discs, respectively. The objective lens has a step structure including a plurality of concentrically formed refractive surface zones divided by steps, the step structure having a function of giving, at each step, an optical path length difference of approximately 2λ1to the first light beam. The first coupling lens causes the first light beam to be incident on the objective lens as a converging beam. The objective lens is positioned to satisfy a condition:in-line-formulae description="In-line Formulae" end="lead"?−0.35<f2×M2−f1×M1<−0.07  (1).in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 7206276 (2007-04-01), Kimura et al.
patent: 7245407 (2007-07-01), Komma
patent: 7430159 (2008-09-01), Koreeda et al.
patent: 7443778 (2008-10-01), Komma
patent: 2004/0047269 (2004-03-01), Ikenaka et al.
patent: 2005/0002118 (2005-01-01), Maruyama et al.
patent: 2005/0078593 (2005-04-01), Maruyama et al.
patent: 2005/0281173 (2005-12-01), Koreeda et al.
patent: 2006/0181978 (2006-08-01), Koreeda et al.
patent: 2007/0075223 (2007-04-01), Murao et al.
patent: 2007/0211599 (2007-09-01), Koike
patent: 2008/0074976 (2008-03-01), Nishikawa et al.
patent: 2009/0262635 (2009-10-01), Kimura et al.
patent: 9-306024 (1997-11-01), None
patent: 2004-247025 (2004-09-01), None
English language Abstract of JP 9-306024, Nov. 28, 1997.
English language Abstract of JP 2004-247025, Sep. 2, 2004.

Affiliated with

Also associated with

Rating

Optical pick-up 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 pick-up, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical pick-up will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4227203