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. 13, 2004
Filed:
Sep. 12, 2002
Hidehiko Fujimura, Tokyo, JP;
Ryoko Horie, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A driving method for a liquid discharge head having a discharge port for discharging liquid; a pressure-applying portion communicating with the discharge port, for applying discharge pressure to the liquid; and a pressure generating device for generating the pressure. The method includes a step of applying first and second discharge pulses for discharging liquid, to the pressure generating device in a sequential manner in response to a one-dot discharge instruction. The pulse widths of the first and second discharge pulses and a rest time between the first and second discharge pulses are determined so that the volume of a first liquid discharged in response to the first discharge pulse is equal to or greater than that of a second liquid discharged in response to the second discharge pulse and the discharge speed of the first liquid is lower than the discharge speed of the second liquid.