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:
Aug. 02, 2022
Filed:
May. 22, 2020
Seiko Epson Corporation, Tokyo, JP;
Takao Hirakura, Matsumoto, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A method for controlling an optical device including a movable section including an optical section that refracts incident video image light and outputs the refracted video image light and a holding section that supports the optical section, and an actuator that causes the movable section to swing, the method including applying a drive signal to the actuator to cause the movable section to swing. The drive signal is a wave having a trapezoidal waveform, and the trapezoidal wave has a first flat section where first voltage is applied for a first period, a second flat section where second voltage higher than the first voltage is applied for a second period, and a third flat section where third voltage higher than the first voltage and lower than the second voltage is applied for a third period after the first voltage is applied and before the second voltage is applied.