Diffraction element and optical pick-up assembly

Details Diffraction element and optical pick-up assembly Diffraction element and optical pick-up assembly

1993-01-29

1996-01-02

Willis, Davis L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, G11B 7135

Patent

active

054815240

ABSTRACT:
A diffraction element includes a diffraction grating for dividing a light beam, emitted from a light source along a predetermined path, into a principal light beam and at least two auxiliary light beams, and a hologram for separating the beam, which has been reflected from an optical information recording medium, from the predetermined path. The diffraction grating and the hologram are integrated together by being formed in alignment with each other in opposite portions of a block of glass or plastics. A slide is provided at at least a portion of the diffraction element and includes a peripheral wall in sliding engagement with a cylindrical surface coaxial with an optical axis of the diffraction element to permit the diffraction element to be rotatable about the optical axis.

REFERENCES:
patent: 4918300 (1990-04-01), Tsiji et al.
patent: 5136152 (1992-08-01), Lee
patent: 5231620 (1993-07-01), Ohuchida
Patent Abstracts of Japan, vol. 14, No. 398 (P-1097)(4341) Aug. 28, 1990.
Patent Abstracts of Japan, vol. 14, No. 274 (P-1061) Jun. 13, 1990.
Patent Abstracts of Japan, vol. 12, No. 408 (P-778)(3255) Oct. 28, 1988.
Patent Abstracts of Japan, vol. 13, No. 570 (P-977) Dec. 18, 1989.

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