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:
Apr. 29, 1997
Filed:
Feb. 21, 1995
Applicant:
Inventors:
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
358505 ; 358509 ; 358475 ;
Abstract
A color image scanner and color image scanning method that generates three different colors independently using multiple LEDs and controls the exposure time of a charge coupled device (CCD) and the light emitting time of the LEDs in order to maintain suitable balance and levels for the colors which are generated. A primary timer sets the operation time of the CCD and a secondary timer sets the ON time for each LED. In addition, an LED drive circuit driving the LEDs has two constant current circuits to more evenly read the images of the document to be scanned.