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:
Mar. 12, 2013
Filed:
Mar. 09, 2011
Yasuo Ueda, Kanagawa, JP;
Yasuo Ueda, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A triangular wave generator in a pulse width modulation signal generator to generate a triangular wave signal and a pair of pulse signals. The first pulse signal is pulsed for a given duration of time when the triangular wave signal reaches a minimum limit thereof. The second pulse signal is pulsed for a given duration of time when the triangular wave signal reaches a maximum limit thereof. The voltage comparator generates a first pulse width modulation signal by comparing the triangular wave signal with an externally supplied direct current signal. The wave shaping circuit generates a second pulse width modulation signal by removing chattering components occurring immediately after rising and falling edges of the first pulse width modulation signal with a masking signal generated based on the first and second pulse signals and the first pulse width modulation signal.