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:
Dec. 16, 2003
Filed:
Sep. 24, 2001
Seiko Precision Inc., Chiba-ken, JP;
Abstract
Photometric apparatus and photometric method measure a wide range of incident light amounts accurately and efficiently. The photometric apparatus includes an optical sensor for delivering a photocurrent; an integrator capacitor for integrating the photocurrent to provide an integrated voltage; a voltage measurer measuring the integrated voltage; an integration time measure for measuring an integration time which the integrator capacitor integrates the photocurrent; for resetting the integrator capacitor whenever the voltage across the integrator capacitor exceeds a given voltage value; a summer summing a total voltage value integrated by the integrator capacitor during the given time including at least one reset; and a photometric calculator for calculating a photometric value based on the total voltage value and on the integration time.