Apparatus for recording and reproducing optical information and

Details Apparatus for recording and reproducing optical information and Apparatus for recording and reproducing optical information and

1991-05-20

1993-08-10

Psitos, Aristotelis

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

385 36, 385129, G11B 700, G02B 634

Patent

active

052355896

ABSTRACT:
An apparatus for recording and reproducing optical information includes an optical integration detecting element arranged on an optical path of light from a laser beam source to an optical information recording medium. The optical integration detecting element has an optical waveguide layer formed on a substrate; a photodetector connected to the optical waveguide layer; a first gap layer formed on the optical waveguide layer and having a refractive index lower than that of the optical waveguide layer; a second gap layer formed on the first gap layer and having an opening portion and a refractive index lower than that of the optical waveguide layer; an adhesive layer having a refractive index higher than that of the optical waveguide layer and adhered to the first gap layer such that the opening portion of the second gap layer is filled with the adhesive layer; and a prism adhesively fixed to an upper portion of the adhesive layer and constructed by a dielectric substance having a refractive index higher than that of the optical waveguide layer.

REFERENCES:
patent: 4545642 (1985-10-01), Auracher et al.
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patent: 4637684 (1987-01-01), Tomita et al.
patent: 4653844 (1987-03-01), Ward
patent: 4877301 (1989-10-01), Yokomori et al.
patent: 4932743 (1990-06-01), Isobe et al.
patent: 5119452 (1992-06-01), Yokomori et al.
U.S. Ser. No. 07/683,724, filed on Apr. 11, 1991.

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