Registers – Coded record sensors – Particular sensor structure
Patent
1985-03-07
1987-07-14
Pitts, Harold I.
Registers
Coded record sensors
Particular sensor structure
235463, 235471, 235472, G06K 710
Patent
active
046804579
ABSTRACT:
A code reader and method which is capable of reading "black-on-black" codes such as bar codes which are molded in the surface of an object. The code is illuminated so as to provide light-to-shadow transitions which are read by an imaging device such as a video camera. The resultant video signal transitions representing light-to-dark transitions are differentiated and converted to a train of pulses which are submitted to a delay line sequencing network to develop a series of timing signals. These timing signals are utilized to operate a sampling network to derive 0-bit and 1-bit code information which is submitted serially to a serial-to-parallel shift register to permit code reading by a microcomputer function. Legality checks are carried out with respect to sampling and the developed work and quiescent zones are developed with respect to the start and stop of a given code sequence.
REFERENCES:
patent: 3800282 (1974-03-01), Acker
patent: 4001780 (1977-01-01), Kikukawa
patent: 4114030 (1978-09-01), Nojiri
patent: 4147295 (1979-04-01), Nojiri
patent: 4535204 (1985-08-01), Hughes
patent: 4578570 (1986-03-01), Mazumder
Pitts Harold I.
Telesis Controls Corporation
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