System for converting image information into electrical signals

Facsimile and static presentation processing – Facsimile – Recording apparatus

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358294, H04N 112

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active

044778368

ABSTRACT:
In a system for converting visible information into electrical signals, in which a light beam such as a laser beam scans an original linewise and resulting reflections from the original are collected and directed to signal generating detector means, such as a photoelectric detector, by a light-transmitting body bounded by an entry surface and by two broad specular surfaces parallel to the line to be scanned, the light-transmitting body is provided with two lateral side surfaces which at least near the entry surface are perpendicular to the line connecting the ends of the line to be scanned and are made specular, as by being polished, so that the intensity level sensed at the detector is increased by internal reflections of the side surfaces. A concave configuration of the entry surface enhances the collection of diffuse reflections. The light of specular reflections can be prevented from saturating the detector by employing a suitably polarized light beam for the scanning or by providing a polarization filter in the path of reflected light between the original and the light-transmitting body.

REFERENCES:
patent: 3264407 (1966-08-01), Headd et al.
patent: 3566119 (1971-02-01), Lewis
patent: 4199789 (1980-04-01), Yuard
patent: 4220978 (1980-09-01), Rhyins
RCA Review, A Technical Journal, published quarterly by RCA Laboratories, vol. XV, by Warren H. Bliss and Charles J. Young, (Sep. 1974), pp. 275-290.
An Improved Optical Scanning Head for Facsimile Transmitters by M. S. Pembroke, Muirhead Technique, vol. 11, No. 3, (Jul. 1957), pp. 23, 24.
Patents Abstracts of Japan, vol. 2, No. 19, (Feb. 8, 1978), No. 5218183.

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