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:
Oct. 12, 2004
Filed:
Sep. 17, 2003
Applicant:
Inventors:
Nobuyoshi Hagiuda, Yokohama, JP;
Masakuni Ohta, Ohta-ku, JP;
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B 1/503 ; H02M 2/10 ;
U.S. Cl.
CPC ...
G03B 1/503 ; H02M 2/10 ;
Abstract
A flash apparatus operates on power supplied from internal batteries and an external battery in an auxiliary battery apparatus. A battery check is executed by detecting the charge speed at which a main capacitor is charged and comparing the charge speed with a threshold value. The threshold value is set higher when the auxiliary battery apparatus is mounted than the threshold value set when the auxiliary battery apparatus is not mounted. Thus, an accurate battery check reflecting the presence/absence of the auxiliary battery apparatus can be achieved.