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:
Dec. 02, 2014
Filed:
Dec. 12, 2012
Canon Kabushiki Kaisha, Tokyo, JP;
Tomoya Teraji, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
Disclosed is a printing apparatus capable of safe high-speed leakage detection and contact detection of a printhead. The leakage detection and contact detection are executed in the apparatus which prints on a printing medium by scanning a removable printhead mounted to a carriage. When the printhead is mounted, connection with a capacitor used in normal printing is disconnected, a lower voltage is applied to drive a printing element and monitor the voltage. If the monitored voltage is not less than a predetermined threshold, occurrence of a poor contact is determined. This is performed for electric contacts one by one. During the operation, a lower voltage is applied at a predetermined timing to drive a printing element and monitor the voltage. If the monitor voltage is not higher than a predetermined threshold, occurrence of current leakage is determined.