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. 06, 2012
Filed:
Jan. 20, 2012
John P. Drummond, Glenageary, IE;
Kenneth Schofield, Holland, MI (US);
John P. Drummond, Glenageary, IE;
Kenneth Schofield, Holland, MI (US);
Donnelly Corporation, Holland, MI (US);
Abstract
An interior rearview mirror system for a vehicle includes an interior rearview mirror assembly having a reflective element and ambient and glare light sensors. A control circuit is operable to establish a reflectance level of the reflective element. At least one of (a) the mirror system includes a charge accumulation device selectively connected with the ambient or glare light sensor and the control circuit establishes the ambient and glare light levels as a function of time for an output of the charge accumulation device to reach a reference level when connected to the respective light sensor, (b) a common element is used to measure outputs of the light sensors sequentially to correspond errors due to component variations, and (c) the mirror system includes temperature compensation of the glare and/or ambient light sensor and the temperature compensation is responsive to a reference light sensor that is substantially not exposed to light.