Incremental printing of symbolic information – Ink jet – Controller
Patent
1998-03-09
2000-08-29
Braun, Fred L.
Incremental printing of symbolic information
Ink jet
Controller
347 14, B41J 2938
Patent
active
061097160
ABSTRACT:
In an ink-jet printing apparatus, a first drive pulse is applied to a printing head and then a second drive pulse is applied to the printing head. The second drive pulse has a magnitude equal to that of the first drive pulse and a pulse width equal to approximately 1.6 to 1.8 times the one-way propagation time T of pressure wave in an ink channel so that a center of the second drive pulse is provided in a range of approximately 2.25 to 2.75 times the one-way propagation time T from an end time of the first drive pulse. Voltages of the drive pulses to the printing head are regulated according to variation in the viscosity of ink to be ejected. The viscosity of ink is represented by the ambient temperature around the printing head. This arrangement makes it possible to ensure adequacy in volume of ink per droplet and stability in ink droplet ejection rate.
REFERENCES:
patent: 4352114 (1982-09-01), Kyogoku et al.
patent: 4947194 (1990-08-01), Kyoshima
patent: 4972211 (1990-11-01), Aoki
patent: 4980699 (1990-12-01), Tanabe et al.
patent: 5264865 (1993-11-01), Shimoda et al.
patent: 5774137 (1998-06-01), Yoshida
patent: 5909228 (1999-06-01), Takahashi
Braun Fred L.
Brother Kogyo Kabushiki Kaisha
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