Plural-beam optical head

Details Plural-beam optical head Plural-beam optical head

1994-10-17

1995-07-18

Nguyen, Viet Q.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369109, 369110, 369 4423, 369 4424, 369 4437, 369 4439, 359438, 359496, 359678, 359837, G11B 1100

Patent

active

054348412

ABSTRACT:
A plural beam optical head is constituted by an optical system for imaging a plurality of light beams onto an optical information recording medium, a double-refractive crystal prism and a sensor. The plurality of light beams obtained from the optical information recording medium are separated into components the polarized direction of which are orthogonal one another by the double-refractive crystal prism. The direction of arrangement of the plurality of light beams incident on the double-refractive crystal prism is substantially perpendicular to the direction of separation of the light beams obtained from the double-refractive crystal prism. The light beams from the double-refractive crystal prism are received by the sensor.

REFERENCES:
patent: 4547872 (1985-10-01), Henmi et al.
patent: 4592038 (1986-05-01), Kubota et al.
patent: 4607359 (1986-08-01), Matsubayashi et al.
Patent Abstracts of Japan, Kokai No. 58-218033, vol. 8, No. 7, Apr. 4, 1984.
Patent Abstracts of Japan, Kokai No. 02-183452, vol. 14, No. 462, Oct. 5, 1990.
Patent Abstracts of Japan, Kokai No. 02-240849, vol. 14, No. 561, Dec. 13, 1990.
"Polarization Splitting Prism," IBM Technical Disclosure Bulletin, vol. 33, No. 1A, Jun. 1990, pp. 110 and 111.

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