Printhead with reduced interconnections to a printer

Details Printhead with reduced interconnections to a printer Printhead with reduced interconnections to a printer

1994-09-26

1996-07-30

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Controller

B41J 205

Patent

active

055416292

ABSTRACT:
The interconnections for transmitting print commands from a printer to a printhead are reduced by the use of on-printhead circuitry. In a basic embodiment, the printhead driver circuitry includes a matrix of drivers controlled by gates, power and control interconnections. Interconnections are reduced by enabling rows and columns of drivers with the power and control interconnections. A multiplexer may also be added to further reduce control interconnections. In an advanced embodiment, the printhead driver circuitry includes a register for converting a serial stream of print enable signals from the printer into a format for applying such signals concurrently to switching devices for one or more heater resistors. An address generator on the printhead generates address signals in response to an address generating signal from the printer. The printer provides constant power to the printhead so that energizing of the heater resistors is a function of the address and print enable signals and not of the power. Variations on the basic and advanced embodiments are also shown and described.

REFERENCES:
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Ream, G. L., "Multiplex Drivers For A Drop-On-Demand Print Head" IBM Technical Disclousre Bulletin, vol. 25, No. 11A Apr. 1983 pp. 5652-5655.

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