Image reader with scanning by array of sequentially illuminated

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system

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35821311, 358293, H01J 4014

Patent

active

046722190

ABSTRACT:
An image reader is adapted to read an image represented on a document. The image reader comprises a reading unit, an LEDs driving circuit, and means for moving the reading unit and the document relatively. The above reading unit comprises an LEDs array arranged in a straight line as light sources, a rod lens array for guiding the light emitted from each LED of the LEDs array and focusing the light on the document, and a pair of photosensors being disposed in parallel and connected in parallel with respect to each other for converting a reflected light from the document to a photocurrent. And each LED of the LEDs array is turned on only one at a time sequentially by means of the LEDs driving circuit, then the reading of the document is effected by means of the photosensors.

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patent: 4446364 (1984-05-01), Hayashi et al.
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patent: 4482804 (1984-11-01), Oritsuki et al.
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International Electron Devices Meeting, 1981 Digest, Section 13.5, by Komiya et al, pp. 309-311.
International Electron Devices Meeting, 1982 Technical Digest, Section 12.7, by Kaneko et al., pp. 328-331.
International Electron Devices Meeting, 1981 Digest, Section 13.6, by Kanoh et al., pp. 312-316.

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