Gray scale printing with ink jet drop-on demand printing head

Recorders – Markers and/or driving means therefor – With ink supply to marker

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310369, G01D 1516

Patent

active

044994796

ABSTRACT:
An ink jet drop-on-demand printing system having gray scale capability comprising a transducer having a plurality of separately actuable sections. Print data is provided which defines a selected drop volume and control means is provided which is operable in response to the print data to produce drive signals to selectively actuate a particular combination of the separately actuable sections of the transducer to produce a drop of the volume specified by the print data. To provide further control over the drop volume while maintaining the drop velocity within selected limits, the amplitude of the drive signals can also be varied. A further refinement can be provided by varying not only the amplitude of the drive signals but also the pulse width of the drive signals. In a first embodiment the transducer sections are of equal length, while the sections are of unequal length in a second embodiment.

REFERENCES:
patent: 3747120 (1973-07-01), Stemme
patent: 3832579 (1974-08-01), Arndt
patent: 3946398 (1976-03-01), Kyser et al.
patent: 4222060 (1980-09-01), Sato et al.
patent: 4251824 (1981-02-01), Hara
patent: 4281333 (1981-07-01), Tsuzuki et al.
patent: 4395719 (1983-07-01), Majewski

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