Optical pickup device

Details Optical pickup device Optical pickup device

2007-11-27

2007-11-27

Korzuch, William R. (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

Reexamination Certificate

active

11007444

ABSTRACT:
First and second phase function curves are respectively obtained based on first and second phase functions with a wavelength having the same value as a reference wavelength λ1of a first laser light being determined as a designed wavelength λ, a phase shift element then has an inner circular side tiered phase difference pattern portion formed in annular shapes in an inner circular area on one surface thereof based on the first phase function curve and an outer circular side tiered phase difference pattern portion formed in annular shapes in an outer circular area outside the inner circular side tiered phase difference pattern portion based on the second phase function curve. A tier pitch of tiers of the inner circular side tiered phase difference pattern portion is set to a height corresponding to a phase difference of approximately 1λ and, on the other hand, a tier pitch of tiers of the outer circular side tiered phase difference pattern portion is set to a height corresponding to a phase difference of approximately mλ (where m is a natural number which does not include 0) or a height corresponding to a phase difference of approximately mλ by changing a value of m in accordance with each tier.

REFERENCES:
patent: 5526338 (1996-06-01), Hasman et al.
patent: 6275461 (2001-08-01), Yoo et al.
patent: 6836378 (2004-12-01), Sugi et al.
patent: 6930974 (2005-08-01), Kunimatsu
patent: 7012876 (2006-03-01), Hendriks et al.
patent: 2005/0007931 (2005-01-01), Sakamoto et al.
patent: 2005/0025028 (2005-02-01), Hirai et al.
patent: 2005/0063283 (2005-03-01), Ori et al.
patent: 06-082725 (1994-03-01), None
patent: 2002-236253 (2002-08-01), None
patent: 2003-270525 (2003-09-01), None
patent: 2003-272213 (2003-09-01), None
Koike, K., et al., “Phase Shift Element for Blu-ray Disk/DVD Compatibility”,Technical Digest for ODS, WA6, (2003).

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3873128