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:
Nov. 06, 2007
Filed:
Jul. 22, 2004
Kazunori Masuda, Saitama, JP;
Kazunori Masuda, Saitama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A printhead driving method in a power source device to output a printhead driving voltage, for generating an optimum voltage for a characteristic of the printhead attached to a printing apparatus, without controlling an output voltage with high accuracy. The printhead is provided with a reference voltage source to set an output voltage of a head driving power source. A head driving power circuit incorporated in the printing apparatus compares a value obtained by dividing the reference voltage with a value obtained by dividing the output voltage from the power circuit and performs control so as to eliminate an error. Further, the printhead is provided with a non-volatile memory, and data to supply driving energy to optimize a discharge characteristic of the printhead is obtained upon final test of manufacturing process by using a test device having a similar construction to that of the head driving power circuit incorporated in the printing apparatus. The data is written into the non-volatile memory. When the printhead is attached to the printing apparatus, the data is read from the memory and a driving pulse used in actual printing is determined based on the data.