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:
Feb. 06, 1990
Filed:
Apr. 21, 1989
Katsuhiko Odajima, Sohka, JP;
Motoshige Ikehata, Sohka, JP;
Shoketsu Kinzohu Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An electropneumatic transducer for converting an electric signal to a pneumatic pressure has a nozzle flapper mechanism and a pilot valve engaging a diaphragm assembly. The nozzle flapper mechanism has a nozzle flapper composed of an electrostrictive element. The diaphragm assembly comprises two diaphragms having different effective areas. A nozzle back pressure is applied to one of the diaphragms, and an atmospheric pressure is applied to the other diaphragm. A supplied pressure or output pressure is applied between the two diaphragms. The nozzle back pressure is varied dependent on the voltage applied to the electrostrictive element for moving the diaphragms to enable the pilot valve to control a valve disposed in a passage connecting supply and output ports.