PWA inkjet printer element with resident memory

Details PWA inkjet printer element with resident memory PWA inkjet printer element with resident memory

1995-01-20

1998-04-21

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 12, 347 13, B41J 2155

Patent

active

057423059

ABSTRACT:
An inkjet page-wide-array "PWA" printer element includes memory resident on its printbar. The printbar memory offloads an otherwise excessive PWA printhead data throughput requirement enabling print speed to approach nozzle speed. Instead of transferring dot data from printer memory directly to printhead nozzle circuitry, dot data is first transferred from printer memory to printbar memory. Dot data then is transferred from printbar memory to the nozzle circuitry. Printbar memory is organized as a plurality of memory planes (i.e., 2 or more). Each plane stores dot data for one or more dot lines. For a 20 kHz nozzle speed, 600 dpi resolution, and an 11 inch printhead, dot data is transferred from printer memory to the printbar memory's first plane at a rate less than 140 MHz. Dot data then is transferred from the first plane to the second plane in one parallel transfer. For a two-plane embodiment dot data then is output from the second plane to respective nozzles to sustain printing at nozzle speed. A multiplexer data path between the second memory plane and the firing circuitry enables output of dot data for multiple nozzles at a time so that an approximately 20 MHz data rate sustains printing at the nozzle speed.

REFERENCES:
patent: 5016023 (1991-05-01), Chan et al.
patent: 5357268 (1994-10-01), Kishida et al.

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