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:
Oct. 13, 1998
Filed:
Dec. 23, 1996
Applicant:
Inventor:
Jenn-Tsair Tsai, Hsinchu, TW;
Assignee:
Nustek Systems, Inc., Hsinchu, TW;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ; G02B / ; G91J / ;
U.S. Cl.
CPC ...
356229 ; 2502081 ; 250205 ; 358406 ; 358504 ; 358475 ;
Abstract
A method and an apparatus for compensating illuminance error of a light source is adapted to be used in a transmission type scanner and utilizes the light signal directly transmitted from the light source to an image pickup device of the scanner without passing through any scanned object as an illuminance calibration reference to compensating illuminance error of the light source. The calibration light signal can be transmitted from the light source to the image pickup device through a light transmission region arranged beside a scanning region.