Objective lens for different optical recording media and an...

Details Objective lens for different optical recording media and an... Objective lens for different optical recording media and an...

2007-09-04

2007-09-04

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

C269S112000

Reexamination Certificate

active

10808301

ABSTRACT:
An objective lens and an optical pickup device utilizing it are disclosed wherein the objective lens includes a specified aspheric surface profile having a discontinuity and a single specified diffraction optical surface so to provide a focusing effect which is usable with different optical recording media, such as a CD versus a DVD. By providing a single diffraction surface and an aspheric surface having a discontinuity, more freedom of design is achieved for the diffraction surface than would otherwise be possible. The objective lens according to the invention is designed so as to be both compact and inexpensive and enables recording/playback onto either type optical recording media using different wavelengths and different numerical apertures, depending on the recording medium used.

REFERENCES:
patent: 6636365 (2003-10-01), Saito et al.
patent: 6781771 (2004-08-01), Kitahara et al.
patent: 6807139 (2004-10-01), Sakamoto
patent: 6995909 (2006-02-01), Hayashi et al.
patent: 7027377 (2006-04-01), Fujita et al.
patent: 2000-081566 (2000-03-01), None
patent: 2001-235676 (2001-08-01), None
patent: 2002-109775 (2002-04-01), None

Affiliated with

Also associated with

Rating

Objective lens for different optical recording media and an... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Objective lens for different optical recording media and an..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Objective lens for different optical recording media and an... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3792326