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:
May. 08, 2007
Filed:
Dec. 27, 2001
Applicants:
Koichi Tsunoda, Kanagawa, JP;
Satoshi Kanda, Kanagawa, JP;
Inventors:
Koichi Tsunoda, Kanagawa, JP;
Satoshi Kanda, Kanagawa, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H04R 29/00 (2006.01); G03G 21/20 (2006.01);
U.S. Cl.
CPC ...
Abstract
A discomfort index, S, is calculated with an equation, S=0.3135×(Loudness value)+3.4824×(Tonality value)−3.1460. This equation uses a loudness value and a tonality value, both psychoacoustic parameters obtained from a sound from the image forming apparatus at a location 1.00 m±0.03 m apart from an end of the image forming apparatus. A sound caused at the time of charging an image carrier is improved so that the discomfort index S satisfies S<−0.5.