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:
Sep. 24, 2002
Filed:
Oct. 20, 1999
Sunao Ishizaki, Tokyo, JP;
NEC Corporation, , JP;
Abstract
A driving circuit for ink jet head easily configured with inexpensive elements and which, without malfunctioning, generates desired driving waveform signals to drive piezoelectric actuators with a large capacitive load. The driving circuit for ink jet head is provided with a ROM which stores time information and current information for each diameter of ink jet droplets, waveform control circuits which read out the current information from the ROM according to the shape of the corresponding driving waveform signal and output that information as driving waveform data, waveform generating circuits which convert the driving waveform data into analog information and then perform integration operations on that data, to generate driving waveform signals, a data transmission circuit which selects one of the driving waveform signals according to the gradation information of the printing data and applies thus selected signal to the piezoelectric actuators, a data receiving circuit, and transfer gates.