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:
Nov. 10, 1987
Filed:
Sep. 28, 1984
Richard J Ulinski, Sr, Monrovia, CA (US);
RJS Enterprises, Inc., Monrovia, CA (US);
Abstract
The absolute spatial distance of the widths of individual bars and spaces of a bar code are precisely measured by a bar code scanning apparatus having two photodetector circuit elements positioned a fixed and predetermined distance from each other for sensing light reflected from the bars and spaces of the bar code at a fixed differential time. The photodetectors are part of an integral unit and are parallel in independent circuits connected to a digital processing unit and storage memory for clocking the passage of the two photodetectors over the bars and spaces against an absolute time determined from a constant frequency pulse generator or digital clock. The precise measurement is compared with references and a readout is provided. A method for determining the precise width of each individual bar and space includes the determination of an average velocity determined from the velocity of the photodetectors over the leading edge of a bar or a space, and of the velocity over the trailing edge of the bar or space. From the average velocity and the time, an absolute spatial distance is determined.