Optical track position detecting apparatus and optical informati

Details Optical track position detecting apparatus and optical informati Optical track position detecting apparatus and optical informati

1982-07-27

1985-06-25

McElheny, Jr., Donald

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

G11B 700

Patent

active

045258260

ABSTRACT:
In an optical information processor such as an optical disc apparatus, when a light beam is irradiated to a plurality of tracks on an information recording medium, the plurality of tracks act as a diffraction grating. Areas in which light receiving parts of a light detector are arranged are determined by a track pitch, a wavelength and a numerical aperture of a condenser lens so that the light detector detects only a change in a light intensity due to an interference between a 0-order diffracted light ray and a 1-order diffracted light ray.

REFERENCES:
patent: 3963862 (1976-06-01), Bouwhuis
patent: 4006293 (1977-02-01), Bouwhuis et al.
patent: 4065786 (1977-12-01), Stewart
patent: 4242579 (1980-12-01), Bouwhuis
patent: 4349901 (1982-09-01), Howe
patent: 4446548 (1984-05-01), Bouwhuis et al.

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