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:
Mar. 14, 1978
Filed:
Oct. 14, 1975
Hiroshi Iwata, Osaka, JA;
Katsuji Ishikawa, Osaka, JA;
West Electric Co., Ltd., , JA;
Abstract
The aperture setting blades, which are drivingly coupled to a step-motor, have main openings which define the main aperture through which a subject is focused upon the photosensitive recording medium, and incident light control means adapted to control the quantity of light from the subject incident upon a photosensitive transducer. In response to the output from the photosensitive transducer, the transmission of clock pulses from a pulse generator to a step-motor control circuit is controlled so that the main aperture may be opened to the optimum opening area depending upon the brightness of the subject. Light control means consists of an auxiliary aperture defined by auxiliary openings cut through the shutter blades and adapted to change its opening area in proportion to that of the main aperture or an electro-optical element such as a liquid crystal or Kerr cell whose light transmissibility changes when subjected to the electric field which is changed in response to the opening area of the main aperture.