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:
Nov. 03, 1998
Filed:
Nov. 26, 1997
Saori Shimizu, Hachioji, JP;
Katsutoshi Nishiuchi, Hino, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
The present invention provides a power supply unit of a camera which efficiently drives a heavy-load system even when a power supply voltage is low and thus drives a heavy-load circuit in a short time in the photographing sequence of the camera without any trouble. The power supply unit includes a charging section for charging a capacitor with a boosted DC power supply voltage, a switching section which receives the output voltage of the charging section and the DC power supply voltage and selectively applies one of these voltages to the heavy-load circuit, and a control section for controlling operations of the switching section and the charging section. The control section controls the switching section such that the output voltage of the charging section is output in the early stage of a time period during which the power supply voltage is being applied to the heavy-load circuit and then the DC power supply voltage is output. The control section also controls the charging section such that the DC power supply voltage is boosted while the DC power supply voltage is being applied to a load.