| 摘要 |
PCT No. PCT/US96/04885 Sec. 371 Date Dec. 5, 1996 Sec. 102(e) Date Dec. 5, 1996 PCT Filed Apr. 9, 1996 PCT Pub. No. WO96/32271 PCT Pub. Date Oct. 17, 1996In drop on demand thermal printing heads, as the number of printing nozzles which are activated at any time vary from zero to several thousand nozzles, the instantaneous resistive load variations on the power supply would normally be sufficient to cause significant drop size variations. These variations are compensated for by a counter which provides a number representing the number of ink drops which are to be ejected during an enable period. The output of the counter is connected to a device which determines the power supply voltage required during the enable period. This result is used to control a programmable heater power supply for the print head.
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