Halographic scanner having adjustable sampling rate

Details Halographic scanner having adjustable sampling rate Halographic scanner having adjustable sampling rate

1986-12-08

1989-01-24

Pitts, Harold I.

Registers

Coded record sensors

Particular sensor structure

235457, G06K 710

Patent

active

048002569

ABSTRACT:
An improved holographic scanner includes circuitry for adjusting the frequency with which an analog photodetector signal is sampled in accordance with the focal length of the scanning beam produced by the active holographic facet. Two embodiments are shown. In one embodiment, facet-edge signals are used to track the facets. A processor retrieves a predetermined frequency scaling factor appropriate for each facet. In the other embodiment, a holographic disk carries an auxiliary data track. The track has timing indicia with spatial frequencies dependent upon the focal length of the adjacent facet. The timing indicia are used to control the output of a voltage controlled oscillator in a circuit including a phase locked loop.

REFERENCES:
patent: 4097729 (1978-06-01), Seligman
patent: 4282431 (1981-08-01), Anthony
patent: 4505537 (1985-03-01), Funato
patent: 4548463 (1985-10-01), Cato
patent: 4692603 (1987-09-01), Brass

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