Optical scanning method and apparatus

Details Optical scanning method and apparatus Optical scanning method and apparatus

1980-07-21

1981-12-15

Murray, Richard

Facsimile and static presentation processing

Facsimile

Recording apparatus

358208, 358213, 358293, H04N 308

Patent

active

043062520

ABSTRACT:
Optical scanning method and apparatus suitable for use with a video player for scanning an information bearing medium to produce a standard television signal is disclosed. The scanning apparatus includes a movable mirror that deflects an optical path to effect a scan. The mirror is angularly displaced, back and forth, between first and second positions at a substantially constant rate in a "back-to-back sawtooth" fashion, such that one scan is made as the mirror is moved from the first position to the second position, and the next scan is made as the mirror is returned from its second position to its first position. The scanning apparatus inverts an image transmitted along the optical path between each successive scan to provide scanning in a "sawtooth" fashion, e.g. scanning an image from top to bottom--quickly retracing to the top of the image--and repeating the scanning process from top to bottom, as is required in the standard television scanning format.

REFERENCES:
patent: 2590281 (1952-03-01), Sziklai
patent: 2976357 (1961-03-01), Hammett
patent: 3410954 (1968-11-01), Erde
patent: 3816655 (1974-06-01), Favreau
patent: 4148071 (1979-04-01), Zinchuck
patent: 4245240 (1981-01-01), Tanaka
"An Experimental Telecine Using a Line Array CCD Sensor", Childs et al., SMPTE Journal, vol. 87, No. 4 Apr. 1978, pp. 209-213.

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