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:
May. 19, 1992
Filed:
Dec. 07, 1990
Fumihito Arai, Tokyo, JP;
Yoshihiko Mori, Tokyo, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A pre-measurement of the subject brightness is performed with a preset aperture value and a preset shutter speed, and a main measurement is performed with a combination of an aperture value and a shutter speed that are determined based on the result of the pre-measurement in accordance with a program for the main measurement, wherein the aperture value is selected from among a relatively small number of predetermined aperture values. Thereafter, a combination of an aperture value and a shutter speed for photographing is determined based on the result of the main measurement in accordance with another program, wherein the aperture value is selected among a larger number of predetermined aperture values, so that the number of changing aperture value and thus the time lag are remarkably reduced while achieving an accurate exposure control.