Optical head and optical disc apparatus for focusing a...

Details Optical head and optical disc apparatus for focusing a... Optical head and optical disc apparatus for focusing a...

2006-12-19

2006-12-19

Psitos, A M (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

07151737

ABSTRACT:
An optical head includes a laser source (11) irradiating the laser beam having a wavelength not longer than 500 nm, a collimator lens (13) for collimating the laser beam to the parallel rays, an optical beam shaping system (14, 15) that adjusts the cross sectional shape of the beam from the collimator lens, and an objective lens (16) that converges the beam on an optical information medium. The optical head has a relationship between a focal length fCLof the collimator lens and a magnification M of beam shaping satisfies the following equation:ASO≥(CfCL)2⁢arcsin⁡[(M-1)(n2⁢M-1)]in which C is a constant in (λ·mm)1/2, Asois a maximum astigmatism per displacement of the collimator lens from the focal position, and n is a refractive index of a member of optical beam shaping system.

REFERENCES:
patent: 5477386 (1995-12-01), Okuda et al.
patent: 5825555 (1998-10-01), Oono et al.
patent: 5978148 (1999-11-01), Oono et al.
patent: 5991102 (1999-11-01), Oono et al.
patent: 6052236 (2000-04-01), Nakasuji et al.
patent: 6134197 (2000-10-01), Ishibashi et al.
patent: 6154433 (2000-11-01), Hoshino et al.
patent: 6876622 (2005-04-01), Nishi
patent: 3086937 (1991-04-01), None
patent: 2933325 (1999-05-01), None

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3715374