Nonlinear scan drive reader with variable clock correction

Details Nonlinear scan drive reader with variable clock correction Nonlinear scan drive reader with variable clock correction

1975-12-15

1977-06-28

Boudreau, Leo H.

Communications: electrical

Digital comparator systems

3401463H, 358208, 358285, 358263, G06K 900

Patent

active

040328880

ABSTRACT:
A mirror driven by a resonant mechanical oscillator is used to scan a laser beam across a document. The incident laser beam line scans the record and is absorbed or reflected depending upon the presence or absence of an image on the record. The reflected intensity modulated light is detected by photomultiplier tubes which provide a video analog signal. An A/D device digitizes the analog signal forming a DATA OUT signal. The laser beam scan velocity across the document varies sinusoidally because of the resonant nature of the drive system. The data flow, or bit density of DATA OUT, has a corresponding sinusoidal variation. A write rate controller provides a variable clock which accompanies the DATA OUT. The variable clock has a periodic variation which matches the scan velocity. The rate of the variable clock matches the bit density of DATA OUT causing DATA OUT to be entered into a data bank properly notwithstanding its nonuniform bit density.

REFERENCES:
patent: 3532408 (1970-10-01), Dostal
patent: 3541248 (1970-11-01), Young
patent: 3584144 (1971-06-01), Shepard et al.
patent: 3717772 (1973-02-01), Engman
patent: 3719780 (1973-03-01), Gazard et al.
patent: 3835249 (1974-09-01), Dattilo et al.
patent: 3848087 (1974-11-01), Carrell
patent: 3883737 (1975-05-01), Throssell et al.
patent: 3893079 (1975-07-01), Shepard et al.
patent: 3953859 (1976-04-01), Locke

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