Correction element of lower light intensity around an optical ax

Details Correction element of lower light intensity around an optical ax Correction element of lower light intensity around an optical ax

1998-01-26

1999-07-06

Edun, Muhammad

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369109, 369 4412, G11B 712

Patent

active

059205377

ABSTRACT:
An optical head apparatus which records or reproduces signals stably on optical disks having different thicknesses. A correction hologram element or a correction filter is provided between a light source and a 2-focus lens in order to decrease optical intensity at a portion distant from the optical axis or to change the optical path length. The light which passes the correction hologram element or a correction filter is converged by the 2-focus lens as a micro-spot on an optical disk. The 2-focus lens comprises a hologram lens which diffracts a part of the light beam and an object lens.

REFERENCES:
patent: 4460990 (1984-07-01), Opheij
patent: 4698816 (1987-10-01), Chun
patent: 4957336 (1990-09-01), Hasegawa et al.
patent: 5247510 (1993-09-01), Lee et al.
patent: 5446565 (1995-08-01), Komma et al.
patent: 5496995 (1996-03-01), Kato et al.
patent: 5612942 (1997-03-01), Takahashi

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