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:
Jul. 30, 1991
Filed:
Sep. 04, 1990
Harold R Macks, Royal Oak, MI (US);
Lectron Products, Inc., Rochester Hills, MI (US);
Abstract
A vehicle lamp control sensor for switching a lamp on or off depending on ambient levels. The device employs a silicon photodetector in combination with a filter chosen to give the detector a response curve that peaks at about 550 nanometers. This gives the control sensor the same proximate spectral response as the human eye. The photo detector transmits an electrical signal in response to the ambient light. The electrical signal is sensed by a lamp switching circuit to switch the vehicle lamp at predetermined light levels. The vehicle lamp control sensor will thus respond to changes in the ambient light levels in a manner which matches the perceived light levels of a human observer.