Two plate-like beam splitting device

Details Two plate-like beam splitting device Two plate-like beam splitting device

1995-04-27

1997-05-13

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369103, 369109, 369110, 369 4414, G11B 700

Patent

active

056299192

ABSTRACT:
In an optical head, a light emitting element emits an optical beam, and the beam is condensed by a condensing element onto an information recording medium. A first plate beam-splitting element has a splitting ratio of P polarization to S polarization, and it splits at least a part of the beam reflected by the information recording medium along a direction different from that of a direction returning to the light emitting element. A second plate beam-splitting element is provided in parallel to the first plate beam-splitting element, and it splits the beam split by the first plate beam-splitting element into at least two beams having polarization planes perpendicular to each other. The two beams are detected by a pair of photosensors. Because the first and second beam-splitting elements are set in parallel to each other, an optical path from the light emitting element to the information recording medium is separated from that of a reflected beam from the medium with a very small angle, and the optical elements can be located at adjacent positions to each other. Thus, the optical head can be made compact to a large extent. Further, the optical head can be sealed for high reliability.

REFERENCES:
patent: 4771414 (1988-09-01), Yoshimatsu
patent: 4794585 (1988-12-01), Lee
patent: 5231620 (1993-07-01), Ohuchida
patent: 5428584 (1995-06-01), Yoshida et al.

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