Method and apparatus for variation of ink droplet velocity and d

Details Method and apparatus for variation of ink droplet velocity and d Method and apparatus for variation of ink droplet velocity and d

1995-07-26

1999-03-23

Hartary, Joseph

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 57, 347 62, 347 94, B41J 205

Patent

active

058867163

ABSTRACT:
Variation of ink droplet velocity and droplet mass in thermal ink-jet print heads having at least one primary heater element is achieved by means of a circuit for generating time-shifted heating pulses. The heater element structure is such that there is at least one secondary heater element in addition to and physically separated from each primary heater element. The circuit for generating time-shifted heating pulses for the primary and secondary heater elements applies those pulses in such a way that a vapor bubble has already formed in the printing fluid on the secondary heater element at the point at which a vapor bubble starts to form in the printing fluid on the primary heater element.

REFERENCES:
patent: 4251824 (1981-02-01), Hara
patent: 5481287 (1996-01-01), Tachihara

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