Fast scan jitter measuring system for raster scanners

Details Fast scan jitter measuring system for raster scanners Fast scan jitter measuring system for raster scanners

1984-10-22

1986-10-28

Goldberg, E. A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358264, 369118, 350 68, H04N 123, H04N 136, H04N 129, G02B 2608

Patent

active

046202374

ABSTRACT:
A system for detecting and measuring fast scan jitter having first and second photosensors combined in a unitary detector positionable in the path of a scanning beam; means for generating a packet of test pixels for modulating the scanning beam for jitter through a succession of scan lines; said first and second photosensors outputting signal pulses representing the intensity of said scanning beam following modulation by said test pixels; a differential integrator for integrating the signal pulse outputs of said first and second photosensors with one another to provide a test signal for each line scanned; a filter for smoothing said test signal, an amplifier for amplifying said test signal, a peak to peak detector for comparing the test signal of one scan line with the test signal from the succeeding scan lines to provide a jitter signal where said test signals are different; and a meter for converting said jitter signal to a visual readout.

REFERENCES:
patent: 3812371 (1974-05-01), Chin
patent: 3913076 (1975-10-01), Lehureau et al.
patent: 4019186 (1977-04-01), Dressen et al.
patent: 4143403 (1979-03-01), Ohnishi
patent: 4195316 (1980-03-01), Sansome
patent: 4314154 (1982-02-01), Minoura et al.
patent: 4318582 (1982-03-01), Minoura et al.
patent: 4327959 (1982-05-01), Minoura et al.

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