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:
Mar. 21, 2006
Filed:
May. 14, 2003
Chi-lun Chen, Hsin-Chu, TW;
Hao-feng Hung, Taipei, TW;
Yao-de Huang, Hsin-Chuang, TW;
BenQ Corporation, Tao-Yuan Hsien, TW;
Abstract
Methods for detecting a short-circuit problem and an open-circuit problem in an ink jet printer. The ink jet printer includes at least an ink jet unit having an input end, a corresponding nozzle, and a control end. The ink jet printer further includes a driving circuit for providing energy to the ink jet unit via the input end. When the ink jet unit receives an ink jet signal via the control end, the ink jet unit can spray ink via the corresponding nozzle according to the energy received via the input end. The short-circuit problem detecting method includes stopping transmitting the ink jet signal to the control end of the ink jet unit, stopping providing energy to the input end of the ink jet unit, and measuring currents flowing through the input end of the ink jet unit.