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:
Apr. 28, 1981
Filed:
Sep. 07, 1978
Hiroshi Ueda, Nara, JP;
Seiji Yamada, Sakai, JP;
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Abstract
An automatic exposure control system for a single lens reflex camera, of the type wherein diaphragm blades defining a diaphragm aperture are driven in response to a camera release operation to change the aperture in accordance with the light from an object to be photographed (object light) as measured by a light measuring device which has a photoelectric element adapted to receive the object light through changing diaphragm aperture as well as through the camera objective. When the output of the light measuring device reaches or goes beyond a given level, a control device generates an output signal to actuate a first electromagnetic device which stops the operation of the diaphragm blades so that a diaphragm aperture suitable for the object brightness is determined as a function of a set shutter speed and a set film sensitivity. The output signal also serves to actuate a second electromagnetic device which actuates a reflex mirror immediately after the diaphragm aperture determination, with a shutter mechanism being actuated subsequently for film exposure. The shutter may be controlled in accordance with the output of the light measuring circuit which measures the scene brightness through the determined diaphragm aperture.