Optical scanning head

Details Optical scanning head Optical scanning head

2006-03-14

2006-03-14

Nguyen, Hoa T. (Department: 2652)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112230, C369S112250

Reexamination Certificate

active

07012876

ABSTRACT:
An optical head (1) for scanning optical record carriers (2) is provided with a compensator (16) for compensating spherical aberration of the objective system (18) or defocus of the collimator lens (14) caused by operation of the optical head at a temperature different from the design temperature. A surface of the compensator (16) comprises a phase structure in the form of annular areas (52, 53, 54), the areas forming a non-periodic pattern of optical paths of different length. The optical paths change as a function of temperature and form a temperature-dependent wavefront deviation that compensates the spherical aberration and/or defocus.

REFERENCES:
patent: 4753524 (1988-06-01), Sugiyama
patent: 4815059 (1989-03-01), Nakayama et al.
patent: 5260828 (1993-11-01), Londono et al.
patent: 5627847 (1997-05-01), Leger
patent: 6072579 (2000-06-01), Funato
patent: 6084844 (2000-07-01), Takeda
patent: 6154326 (2000-11-01), Ueyanagi et al.
patent: 6191889 (2001-02-01), Maruyama
patent: 6590708 (2003-07-01), Nakai et al.
patent: 0632905 (1995-01-01), None

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3549689