Hologram formed on an objective lens for one defracting light be

Details Hologram formed on an objective lens for one defracting light be Hologram formed on an objective lens for one defracting light be

1996-08-08

1998-05-12

Nelms, David C.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369112, 369 4437, G11B 712

Patent

active

057516790

ABSTRACT:
An optical pickup and a reproducing apparatus includes an objective lens having a hologram lens formed over the entire area of one surface thereof. A central portion of the hologram lens and peripheral portions of the hologram lens are formed differently, so that a laser beam diffracted by the central portion of the hologram lens is focused at plane A, and a laser beam diffracted by the peripheral portion is directed outward. As a result of this, the light intensity distribution after light has passed through the objective lens becomes substantially uniform, so that almost no primary ring is produced, thus preventing cross talk caused by reflected light from an adjacent track.

REFERENCES:
patent: 5416765 (1995-05-01), Aikoh et al.
patent: 5446565 (1995-08-01), Komma et al.
patent: 5523993 (1996-06-01), Freeman
patent: 5526338 (1996-06-01), Hasman et al.

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