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:
Aug. 14, 1984
Filed:
Dec. 10, 1982
Applicant:
Inventors:
Masaaki Yoshida, Tokyo, JP;
Hiroyuki Kataoka, Tokyo, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354415 ; 354423 ;
Abstract
An electronic flash device including a main light part, a pre-emission light part, an illumination direction changing mechanism for changing the illumination directions of the main light part and the pre-emission light at the same time in the case of bounced light photography, and a control mechanism for deciding the aperture value of the photographing lens in accordance with the light measuring level of the reflected pre-emission light and controlling the main light part with the light adjusting level corresponding to the aperture value.