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:
Jun. 25, 2002
Filed:
Sep. 28, 1999
Applicant:
Inventors:
Assignee:
Copyer Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B41J 2/9393 ;
U.S. Cl.
CPC ...
B41J 2/9393 ;
Abstract
An ink-jet image forming device such that the test pattern detecting accuracy is improved with a single photodetector. A binarizing circuit ( ) which binarizes the output of a sensor for a test pattern includes a peak hold circuit ( ) which follows slow change in the sensor output, a voltage dividing circuit ( ) which divides the held output, and a comparator ( ) which converts the sensor output into a bi-level signal by using the output of the circuit ( ) as a threshold.