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:
Jun. 27, 1978
Filed:
Aug. 11, 1977
Tadao Nojiri, Kariya, JA;
Akio Sugiura, Nagoya, JA;
Nippondenso Co., Ltd., Kariya, JA;
Abstract
A bar code having a plurality of parallel bars recorded in either narrow width or wide width is scanned by a plurality of light responsive elements which are driven one by one by a clock pulse of a fixed frequency. The intermittent output image signal of the elements is converted into a continuous signal by sample-and holding the peak level of the image signal at the same frequency as that of the clock pulse. The continuous signal is then compared with a reference value to be converted into a rectangular signal which has time intervals proportional to respective bar widths. For discriminating each bar width, each time interval of the rectangular signal is measured by counting a clock pulse of another fixed frequency and compared with another reference value. The frequency of the clock pulse for interval measuring purpose is determined to be higher than that of the clock pulse for scanning and sample-and-holding purposes.