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:
Aug. 31, 1982
Filed:
Oct. 23, 1980
Randolph S Carlson, Irvine, CA (US);
Other;
Abstract
A circuit for controlling the power supplied to a lamp includes a sensor, located at the lamp, which measures the portion of the lamp's output which is reflected from an illuminated area. This sensor is connected to a sensing circuit which measures the reflectance of the illuminated area. Using this reflectance measurement, the total illumination incident on a work space, both from the light source and from other illumination sources, is determined and this total incident illumination is adjusted by adjusting the power supplied to the light source to provide a controlled illumination. The ability to measure reflectance of the illuminated area using a sensor at the light source itself permits the manufacture of a light source which will self-adjust to illuminate a work area at a desired incident illumination level, without adjustment of the light after installation, and without a requirement that the light source be adjusted if the reflectance of the work area changes.