Device for preventing unwanted reflections from an optical syste

Details Device for preventing unwanted reflections from an optical syste Device for preventing unwanted reflections from an optical syste

1979-02-14

1982-06-29

Cardillo, Jr., Raymond F.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369109, 369110, 369111, G11B 700, G11B 712

Patent

active

043375359

ABSTRACT:
An apparatus is described for reading a record carrier on which information is stored in an optically readable information structure, which apparatus includes a radiation source which supplies a read beam of great coherence length. By including a radiation attenuating element in the radiation path of the read beam, preferably nearest to the radiation source, random intensity modulations in the read beam, which modulations may be caused by undesired reflections in the radiation path, can be substantially reduced.

REFERENCES:
patent: 3534166 (1970-10-01), Korpel
patent: 3829622 (1974-08-01), Elliot
patent: 3919698 (1975-11-01), Bricot
patent: 3969573 (1976-07-01), Bouwhuis
patent: 3969576 (1976-07-01), Boonstra et al.
patent: 3983317 (1976-09-01), Glorioso

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