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:
Dec. 16, 2003
Filed:
Jan. 20, 2000
Yutaka Shimizu, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A portable information processing apparatus includes a memory, an AC/DC converter, a built-in battery, a power source detection mechanism, and a switch. The memory includes a main memory block and a sub memory block. The AC/DC converter converts an AC voltage to a DC voltage supplied to the memory. The built-in battery supplies a battery DC voltage supplied to the memory. The power source detection mechanism detects whether the apparatus operates with the converted AC to DC voltage or the battery DC voltage. The power source detection mechanism generates a detection signal when detecting the battery DC voltage. If the switch receives no detection signal from the power source detection mechanism, the switch supplies the converted AC to DC voltage and the battery DC voltage to the main and sub memory blocks. Otherwise, he switch shuts off a supply of the battery DC voltage to the sub memory block of the memory when receiving the detection signal from the power source detection mechanism.