| 摘要 |
PCT No. PCT/US96/04866 Sec. 371 Date Dec. 3, 1996 Sec. 102(e) Date Dec. 3, 1996 PCT Filed Apr. 9, 1996 PCT Pub. No. WO96/32269 PCT Pub. Date Oct. 17, 1996A method of and apparatus for compensating printing heads which operate in thermal drop on demand printing modes for the effects of thermal lag includes a counter which provides a number representing the amount of elapsed time during a heater energizing pulse as a proportion of the entire pulse duration. The output of the counter is connected to a device which determines the power supply voltage required at the said elapsed time. This result is used to control a programmable power supply which is connected to the heater power supply of the print head. The device is preferably a lookup table stored in digital memory, containing a pulse waveform calculated using iterated transient finite element analysis of the thermal state of the nozzle during simulated operation.
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