Optical information system focal point displacement detecting me

Details Optical information system focal point displacement detecting me Optical information system focal point displacement detecting me

1992-10-22

1994-09-27

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369 4414, G11B 700, G11B 709

Patent

active

053512308

ABSTRACT:
This invention pertains to a displacement detecting device for an optical head for detecting focal point displacement of irradiation light. The displacement detecting device has optical means for converting reflected rays from an irradiated face into an astigmatic bundle of rays and a photodetector for detecting a change in the the focused shape. The displacement detecting device thus detects focal point displacement of irradiation light. The optical means is obtained by integrally forming a plurality of Fresnel zone plates having rectilinear gratings, focusing reflected rays from the irradiated face, and having different focal lengths.

REFERENCES:
patent: 4929823 (1990-05-01), Kato et al.
patent: 4970710 (1990-11-01), Lee
patent: 5111448 (1992-05-01), Komma et al.
patent: 5161040 (1992-11-01), Yokoyama et al.
patent: 5195072 (1993-03-01), Fukui et al.

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