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. 19, 2025
Filed:
Jul. 29, 2021
Seiko Epson Corporation, Tokyo, JP;
Chikara Kojima, Matsumoto, JP;
Tomohide Onogi, Shiojiri, JP;
Kanechika Kiyose, Matsumoto, JP;
Mitsuru Miyasaka, Shiojiri, JP;
Mio Sasaki, Shiojiri, JP;
SEIKO EPSON CORPORATION, Tokyo, JP;
Abstract
A fluid device includes a flow path through which a fluid flows, and an ultrasonic element that transmits an ultrasonic wave to the fluid to generate a standing wave in the fluid in the flow path along a first direction orthogonal to a flowing direction of the fluid. The ultrasonic element includes a vibrator having a fluid contact surface that comes into contact with the fluid, and a piezoelectric element that is provided at the vibrator and that flexurally vibrates the vibrator in a normal direction of the fluid contact surface. When a thickness of the vibrator in the normal direction is t, a sound velocity of a medium of the fluid is C, an average sound velocity of a longitudinal wave transmitted in the vibrator is C′, a dimension of the flow path in the first direction is L, and a mode order of the standing wave is n, the following expression is satisfied.