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:
May. 04, 1999
Filed:
Jun. 13, 1996
Applicant:
Inventor:
Yuji Kurosawa, Tokyo, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B41J / ;
U.S. Cl.
CPC ...
347-7 ; 347 14 ;
Abstract
A printer and facsimile apparatus using the printer capable of detecting residual ink in an ink cartridge with higher precision by eliminating influence of ripples of ink surface due to the movement of an ink cartridge or influence of noise. Reflective type photosensor 11 detects residual ink in ink cartridge 9, and the detection result is current/voltage-converted. Smoothing circuit 152 smoothes the converted detection result including the influence of the trembles of ink surface and the mixing of noise. Then the smoothed voltage is A/D converted and forwarded to processing by CPU 101.