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:
May. 18, 2004
Filed:
Oct. 04, 2002
Koichi Baba, Osaka, JP;
Koji Ikeda, Hyogo, JP;
Koji Matsuo, Fukuoka, JP;
Masashi Tomita, Kumamoto, JP;
Masaharu Oyama, Fukuoka, JP;
Masaichiro Tatekawa, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An ink jet recording apparatus includes: a head body provided with a nozzle and a pressure chamber; an actuator including a piezoelectric element and an electrode for applying a voltage across the piezoelectric element; and a driving circuit for supplying a driving signal to the electrode of the actuator. The driving circuit always supplies an auxiliary pulse signal in every printing cycle. When ink is to be discharged, the driving circuit supplies, after the auxiliary pulse signal is supplied, an ink discharge pulse signal for driving the actuator so that the ink is discharged and so that an ink meniscus vibration in the nozzle is resonant with that caused by the auxiliary pulse signal.