Optical focus detection employing rotated interference patterns

Details Optical focus detection employing rotated interference patterns Optical focus detection employing rotated interference patterns

1984-04-16

1986-08-05

Faber, Alan

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 46, 250201, G11B 709

Patent

active

046047395

ABSTRACT:
In an optical data storage disk device, focus of the recording and sensing beam is detected by sensing lateral shear (rotational orientation of a light interference pattern) of a beam reflected from the optical data storage disk. An exemplary shear detector includes a quadrant sensor having four quadrants for sensing the rotation of the reflected beam's interference pattern. Electrical analysis circuits illustrate evaluation of the sensed rotated interference pattern.

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patent: 4525625 (1985-06-01), Abe
patent: 4542492 (1985-09-01), Leterme
"Interferometer for Measuring Power Distribution of Ophthalmic Lenses", by Wyant & Smith, Applied Optics, Jul. 1975, vol. 14, No. 7, pp. 1607-1612.
Optical Shop Testing by Malacara, .COPYRGT.1978 John Wiley & Sons, p. 105.

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