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:
Apr. 12, 1994
Filed:
Dec. 21, 1992
Tatsuro Kawabata, Kawasaki, JP;
Fujitsu Limited, Kanagawa, JP;
Abstract
A bar code reading apparatus includes a light source for illuminating a bar code, a light receiving part for receiving reflected light from the bar code and for subjecting the received reflected light to a photoelectric conversion to output an electrical signal, and a decoding part for decoding the bar code by reading width data related to widths of the bars and spaces of the bar code based on the electrical signal from the light receiving part. The decoding part includes a sampling part for sampling the electrical signal from the light receiving part with a predetermined period and for outputting sampled data, a calculating part for calculating an average value of the sampled data for every predetermined interval, where the predetermined interval is greater than a maximum width of a noise which is detectable from the electrical signal, and an operation part for obtaining intersecting points where a waveform connecting the sampled data and a waveform connecting the average values intersect and for reading a width of each bar and space within the bar code based on an interval between each two adjacent intersecting points.