Driving system for thermal head

Abstract

Abstract PURPOSE:To enhance recording quality by making recording density constant by detecting drive voltage to control the pulse width of a drive pulse corresponding to the magnitude of said voltage. CONSTITUTION:A CPU 5 reads the pulse width of a drive pulse optimum to set density, that is, the pulse width of each of enable signals ENL1-ENL4 on the basis of the density signal Dn and detection signal Db stored in a RAM 7 from the data table of a ROM 6 to output the same to the drive circuit C of a thermal head 10 through a thermal 1/F 8. These enable signals ENL1-ENL4 are adjusted in their pulse widths corresponding to the voltage of the battery 11 being the power supply of a thermal printer 1 and the pulse widths become long when the voltage becomes low. Therefore, when the voltage Va applied to the thermal head 10 drops, the pulse width of the drive pulse (enable signals ENL1-ENL4) becomes long and recording can be always performed at the density set by an operator.

Inventors

• 👤 Tsutomu Sato
• 👤 勉 佐藤

Bibliographic Details