Correction elements to lower light intensity around an optical a

Details Correction elements to lower light intensity around an optical a Correction elements to lower light intensity around an optical a

1996-05-29

1998-05-19

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369 94, 369103, 369116, G11B 700

Patent

active

057545120

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), Ophij
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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