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:
Dec. 27, 1977
Filed:
Apr. 16, 1975
Hiroshi Iwata, Osaka, JA;
Katsuji Ishikawa, Daito, JA;
West Electric Co., Ltd., Osaka, JA;
Abstract
The invention discloses a camera with an automatic flash exposure system of the type in which depending upon the distance to a subject, the brightness thereof and the light flux to be produced by a flash tube or bulb, an f-number and exposure time are automatically and electrically selected by an exposure control mechanism comprising a plurality of shutter blades which also function as the aperture blades and a stepping motor for opening and closing stepwise the shutter blades. The focusing ring of the camera is operatively coupled to a variable resistor so that the distance to a subject may be converted into a resistance value, and the opening pulse signal consisting of one or a plurality of pulses the number of which is dependent upon this resistance value and hence the distance to the subject is applied to the step motor so that the shutter blades steps down the camera lens to a suitable f-number depending upon the distance to the subject. The exposure time is determined by an integrator including a photocell for detecting the brightness of the subject.