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. 02, 1986
Filed:
Sep. 09, 1985
Yasuo Ishiguro, Tokyo, JP;
Copal Company Limited, Tokyo, JP;
Abstract
An exposure control unit including an element having electrostrictive properties and a fixed end and a deformation quantity of which is determined in accordance with a voltage applied thereto drives a programming shutter provided with shutter blades having the function of the diaphragm by a driving source composed of the deformation produced at a free end of the electrostrictive element when the voltage is applied to the element. The shutter blades having the function of the diaphragm are opened by the deformation produced at the free end of the electrostrictive element in accordance with the voltage applied to the element and the voltage is increased with the lapse of time in interlocked relationship with the opening operation of the shutter blades so that the electrostrictive element is gradually deformed and the shutter blades are also gradually opened. The electrostrictive element is then short-circuited at a time when a proper exposure is obtained so that the exposure operation is immediately terminated.