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. 01, 2000
Filed:
Mar. 19, 1999
Kazuya Iwasaki, Saitama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A drive-voltage control device for a power-saving power-supply circuit provides a control voltage and a drive voltage to a load device connected thereto and controls the supply of the control voltage and the drive voltage so as to achieve a power-saving mode. The drive-voltage control device prevents the load device from being damaged due to on and off of the power-saving mode. The load device is driven by both the control voltage and the drive voltage. A switching element is provided to a power-supply line through which the drive voltage is supplied from the power-saving power-supply circuit to the load device. A timing control circuit controls a timing for switching the switching element so that the switching element is caused to be conductive when a predetermined period has passed after the supply of the control voltage to the load device is begun when the power-saving mode is turned off. The switching element is caused to be nonconductive when the control voltage falls to a predetermined level when the power-saving mode is turned on.