The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 14, 1987
Filed:
Mar. 07, 1985
John A Robertson, Chillicothe, OH (US);
Telesis Controls Corporation, Chillicothe, OH (US);
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.