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:
Sep. 21, 2004
Filed:
Nov. 12, 2002
Takahiro Ohde, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An ink jet recording apparatus includes plural print buffers for storing recording data, a null flag table capable of setting null flags corresponding to the print buffers instead of storing null data on the print buffers, data converting means provided with plural writable blocks for writing the recording data and with a counter for retaining values to designate the writable blocks, clear means for zero clearing the writable blocks in accordance with the values of the counter, DMA means for reading out the recording data from the print buffers for writing the recording data on the writable blocks, and control means for enabling the clear means to zero clear the writable blocks when the null flags are set on the null flag table corresponding to the print buffers, instead of performing a process by the DMA means to read out data from the print buffers.