Patent ID: 6100914
Filing Date: 2000-08-08
Classification: B41J,G06K

Abstract:
An image forming apparatus comprising:storing means for storing input video data;a line head having a plurality of individually driveable light points for producing a plurality of sublines arranged in parallel to form one line of a print image according to said input video data by selectively driving the light points to produce said sublines;first subline data generating means for generating a plurality of first subline data for a plurality of sublines constituting a print line on the basis of the input video data;said first subline data generating means including a first P/S converter which generates said first subline data on the basis of video data of a current line,supplying means for sequentially supplying said first subline data to said line head;designating means for outputting a correction signal when a correction of print line width is required;second subline data generating means for generating second subline data;replacing means for replacing the first subline data with second subline data for print line width correction in response to said correction signal,image forming means which scans the light points of said line head in a first direction and provides relative movement between said line head and a recording medium in a second direction intersecting said first direction to be scanned in said second direction as said sublines are produced, wherein said second subline data generating means includes means for generating the second subline data for print line width correction in said first direction,said designating means designates the print line width correction in at least one of said first direction and said second direction by said correction signal, and said second subline data generating means generates the second subline data for the print line width correction in at least one of said first direction and said second direction, whereby said replacing means replaces said first subline data with said second subline data for print line width correction in at least one of said first direction and said second direction in response to said correction signal,said designating means includes means for outputting a first correction signal for designating the print line width correction in said first direction,said first subline data generating means further includes a second P/S converter which generates the subline data on the basis of video data of a preceding line prior to said current line, and first gate means for outputting the subline data from said second P/S converter as said second subline data in response to said first correction signal, andsaid replacing means includes means for replacing said first subline data with said second subline data from said first means in response to said first correction signal.