Image read-out apparatus with light source driving means

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

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358293, 358294, H01J 4014, H04N 110

Patent

active

046396080

ABSTRACT:
In the case where a plurality of photo sensing elements are arranged in a line to form a linear sensor and picture images are sequentially read out by the photo sensing elements, the uniform illumination is performed by lighting both the light source corresponding to the photo sensing element which is reading and at least one of the light sources adjacent to that light source, thereby obtaining an output signal with less read-out distortion. A plurality of light sources arranged respectively in correspondence with the plurality of photo sensing elements are sequentially turned on by a plurality of blocks at a time and are scanned, thereby providing uniform illumination and suppressing an amount of heat generation in the light sources when they are lit, so that deterioration in the characteristics of the light sources is prevented. In addition, the light source and power source sections are miniaturized, thereby realizing a decrease in size and weight of the whole apparatus.

REFERENCES:
patent: 3835332 (1974-09-01), Bridges
patent: 4162126 (1979-07-01), Nakagawa et al.
patent: 4317137 (1982-02-01), Tompkins

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