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. 16, 2004
Filed:
Nov. 08, 2002
Robert Arthur Black, Milpitas, CA (US);
Agilent Technologies, Inc., Palo Alto, CA (US);
Abstract
A method and apparatus for flattening the illumination intensity over an optical sensor is disclosed. The intensity of light off the axis from a lens is less than the light on axis by a factor of cos &thgr;, where &thgr; is the angle from the lens exit pupil to the off-axis point. Light from the lens incident upon the optical sensor therefore will not be uniform in intensity. Light-blocking patches are placed over the areas of the optical sensor where light intensity needs to be reduced to achieve uniform illumination intensity across the entire optical sensor. Areas of the optical sensor that fall closest to the axis of the lens receive the greatest intensity of light due to the rule of cos &thgr;, and therefore will require more light-blocking patches than areas of the optical sensor further away from the lens axis.