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:
Jan. 14, 2003
Filed:
Jun. 06, 2002
Hiroyuki Ishinaga, Tokyo, JP;
Masami Ikeda, Tokyo, JP;
Ryoichi Koizumi, Yokohama, JP;
Asao Saito, Yokohama, JP;
Kenjiro Watanabe, Tokyo, JP;
Tsutomu Abe, Isehara, JP;
Nobuyuki Kuwabara, Tokyo, JP;
Tsuguhiro Fukuda, Yokohama, JP;
Tsutomu Katoh, Kawasaki, JP;
Toshihiro Mori, Kawasaki, JP;
Seiichiro Karita, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A recording apparatus and method of controlling the apparatus includes a recording head for ejecting liquid ink for recording by heat energization, a temperature change rate detecting device for detecting the temperature change rate of the recording head in a normal state, a storage device for storing the temperature change rate information, a determining device for determining the average ejection duty cycle from recording data, an obtaining device for obtaining information relating the temperature change rate in the normal state to the average ejection duty cycle, and a discriminating device for discriminating an abnormality of the recording head determined by the information relating the temperature change rate in the normal state to the average ejection duty cycle, and the temperature change rate detected by the temperature change rate detecting device.