High-sensitive optical reading apparatus and method of reading o

Details High-sensitive optical reading apparatus and method of reading o High-sensitive optical reading apparatus and method of reading o

1983-01-14

1985-05-07

Pitts, Harold I.

Registers

Coded record sensors

Particular sensor structure

235455, G06K 710

Patent

active

045160171

ABSTRACT:
In an optical reading apparatus having an image sensor for converting optically readable information into an electrical signal, a sensor driving circuit is arranged to produce at least two clocks with which two or more groups of optical imaging elements of the image sensor are respectively driven. In one embodiment, the two clocks have a time or phase difference therebetween so that signal charges from one group of the imaging elements are derived at once after signal charges of another group are derived. The derived signal charges are read out in a sequence within a period equal to the time difference. This enables a charging time to be twice or more the time difference providing high sensitivity. Since at least two or more read data can be obtained within a single charging time, high-speed reading is also resulted. In another embodiment, the optical reader is switched so that one of high-speed mode and high-resolution mode is selected. In a further embodiment, the invention is adapted to a reader having an area image sensor.

REFERENCES:
patent: 3914748 (1975-10-01), Barton et al.
patent: 4250526 (1981-02-01), Fuwa et al.
patent: 4408120 (1983-10-01), Brohka
RCA Review, vol. 32, No. 2, Jun. 1971, pp. 251-262, P. K. Weimer, "Systems and Technologies for Solid-State Image Sensors".
IBM Technical Disclosure Bulletin, vol. 20, No. 6, Nov. 1977, pp. 2177-2178, G. N. Gaebelein et al: "Image Sensor with Integration Time Control".
IEEE Transactions on Electron Devices, vol. ED-18, No. 11, Nov. 1971, pp. 992-996, M. F. Tompsett: "Charge-Coupled Imaging Devices: Experimental Results".

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