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:
Sep. 09, 1980
Filed:
Dec. 26, 1978
John C Nosler, Eugene, OR (US);
Other;
Abstract
Circuitry for locating the mid-point of a spot of illumination on a time-base-scanned linear photodetector (photodiode) array. With each scan, the array produces, from the illuminated photodiodes, a pulse made up of individual 'pixils' having different discreet DC voltage levels. This pulse is filtered to smooth it, and is then compared with a DC reference to produce a related square-wave pulse whose length depends on the time that the level of the filtered pulse exceeds that of the reference. Clock pulses at two different frequencies are provided, and are counted (at different times) from the beginning of each scan until the end of such a square-wave pulse. The desired mid-point is determined from the total count obtained during a scan.