Sughrue, Mion, Zinn, Macpeak & Seas
Recording density correction apparatus in printer
 A recording density correction apparatus in a printer, comprises; a correction gradation level data selection device for producing class numbers for selecting correction gradation level data for respective heating elements constituting a thermal head on the basis of information concerning unevenness in recording density; an odd/even line discriminator for discriminating as to whether a recording line is an odd or even line and for providing the thus obtained line information; and a correction device for providing the correction gradation level data on the basis of the class numbers and the line information so as to correct drive signals for the thermal head. 
Mitsubishi Denki K.K.
B
B41J
inventional
Hiromi
Yamada