Inkjet Types
(At Least From Xerox Perspective)
(From: Peter (hedgieus@yahoo.com).)
Here are history/trivia. (I used to work at Xerox
marking technology group, working on ink-jets and
daisy printers.)
-
Type 1 (or "push") ejects continuous stream
(under pressure). The discovery goes back to
Hertz (one who has the unit named after him) and
theory is described in the book: theory of
Sound, by John William Strutt, 3rd Baron
Rayleigh.
Type 1 was commercialized first for printing
postal labels and other similar applications. It
was a big machine - 5x5x5 meters! Clumsy but
fast. This was before laser printers. IBM
published detailed (and definitive) research
paper on this - circa 1985.
-
Type 2 (or pull) uses electrostatic field to
extract the drop. It was never commercialized.
-
Type 3 (push-pull) or DOD is what we use in
small printers now. Xerox put lot of money into
developing this in the seventies, than (just
when it achieved some 10 kHz
(drops/second/nozzle) in the lab, (considered
necessary minimum for viable printer) Japanese
companies introduced first machines on the
market. (I think first was NEC or Ricoh) and
Xerox dropped the project. (Manufacturing people
in Webster estimated that they can never produce
it at profit, facing this competition.) Later,
Xerox was using Sharp inkjet heads and printers,
under Xerox label. Some research was then
revived, (I suppose in cooperation with OEM
supplier (Sharp).
Printer and Photocopier Troubleshooting and Repair
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Samuel M. Goldwasser
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