Apparatus for optically detecting ink droplets

Details Apparatus for optically detecting ink droplets Apparatus for optically detecting ink droplets

1982-11-22

1985-01-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

346 75, 346140R, G01V 904

Patent

active

044939930

ABSTRACT:
Ink jet printers include orifices which may become clogged or otherwise inoperative. This can cause printing defects which may go undetected for a substantial period because these printers usually operate unattended. An optical detector is provided for testing the operability of each ink jet orifice prior to the beginning of printing either a print cycle or a page. Ink is deposited on a member which moves the deposit through an optical path for detection. Absence of a deposit signals a malfunction.

REFERENCES:
patent: 3870884 (1975-03-01), Williams
patent: 3956987 (1976-05-01), Alix
patent: 3958509 (1976-05-01), Murray et al.
patent: 4176363 (1979-11-01), Kashahara
patent: 4255754 (1981-03-01), Crean et al.
patent: 4323905 (1982-04-01), Reitberger et al.
patent: 4328504 (1982-05-01), Weber et al.
patent: 4392142 (1983-07-01), Seachman et al.
patent: 4410895 (1983-10-01), Houston et al.

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