Optical pick-up apparatus which utilizes plural prisms

Details Optical pick-up apparatus which utilizes plural prisms Optical pick-up apparatus which utilizes plural prisms

1987-12-24

1991-12-31

McElheny, Jr., Donald

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

G11B 712

Patent

active

050777238

ABSTRACT:
An optical pick-up apparatus comprises a light beam generating source, an objective lens for causing a light beam from the light beam generating source to impinge upon a record medium and receiving a reflected light beam from the record medium, a composite prism constituted by a glass prism element, a crystal prism element and a multi-layer of dielectric material provided between the glass and crystal prism elements, which are bonded together, and so disposed that the light beam from the beam generating source and the reflected light beam from the objective lens enter into the glass prism element through respective different optical paths, the light beam from the beam generating source is directed to the objective lens after passing through the glass prism element and at least two light beams obtained based on the reflected light beam from the objective lens emerge from the crystal prism element, and a photodetecting unit for detecting separately the light beams emerging from the crystal prism element of the composite prism.

REFERENCES:
patent: 4545651 (1985-10-01), Kato et al.
patent: 4627688 (1986-12-01), Kobayashi et al.
patent: 4633338 (1986-12-01), Sato et al.
patent: 4641926 (1987-02-01), Shirasaki
patent: 4667316 (1987-05-01), Suda et al.
patent: 4682311 (1987-07-01), Matsubayashi et al.
patent: 4771414 (1988-09-01), Yoshimatsu
patent: 4773053 (1988-09-01), Gottfried
Vol. 9, No. 137 P 363 1860, Jun. 12, 1985 Patent Abstracts of Japan entitled "Magneto-Optical Recording Reproducing Device Having Double Beam Splitter".
Patent Abstracts of Japan Publication No. 58-221812, 4/11/84.

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