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:
Jun. 23, 2009
Filed:
Jan. 17, 2006
Nobuyoshi Kaima, Tokyo, JP;
Nobuyoshi Kaima, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A scanning time is divided by the number of sides of a polygon mirror to obtain a value N. Then, it is determined whether an error has occurred. When no error has occurred, the value N is stored in an NVRAM, and a magnification correction value is calculated. Values M and N of a PLL are set based on the correction value. A difference between a clock set by the PLL and an ideal pixel clock frequency is corrected to an optimal magnification by changing a phase. The ideal pixel clock frequency after magnification correction is calculated from V=N0/N×F. The values M and N of the PLL that provide a frequency closest to the ideal frequency V are acquired. A difference between a frequency V' acquired from the values M and N and the ideal pixel clock frequency V is corrected by the clock phase.