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:
Apr. 27, 2021
Filed:
Aug. 21, 2019
Seiko Epson Corporation, Tokyo, JP;
Shunya Fukuda, Azumino, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A first drive waveform includes, in the following order: a first section in which voltage is changed, a second section in which the voltage is maintained, and a third section in which the voltage is changed in a direction opposite to another direction in which the voltage is changed in the first section. A second drive waveform includes, in the following order: a fourth section in which voltage is changed, a fifth section in which the voltage is maintained, and a sixth section in which the voltage is changed in a direction opposite to another direction in which the voltage is changed in the fourth section. The voltage applied to a piezoelectric element in the second section is higher than the voltage applied to the piezoelectric element in the fifth section. The period of the first drive waveform is shorter than the period of the second drive waveform.