Drop size detect circuit

Details Drop size detect circuit Drop size detect circuit

1993-04-30

1995-07-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25055924, G01N 1506

Patent

active

054344301

ABSTRACT:
An optical drop detect circuit for a thermal ink jet printer. The optical drop detect circuit includes an optical sensor for providing an electrical output indicative of a presence of an ink drop, a transconductance amplifier responsive to the output of said optical sensor, first and second cascaded bandpass amplifiers responsive to the transconductance amplifier, a first comparator circuit responsive to the output of the cascaded bandpass amplifiers for providing an output pursuant to optical sensing of a first minimum ink drop size, and a second comparator circuit responsive to the output of the cascaded bandpass amplifiers for providing an output pursuant to optical sensing of a second minimum ink drop size.

REFERENCES:
patent: 3992103 (1976-11-01), Tyley et al.
patent: 4063252 (1977-12-01), Jensen et al.
patent: 4720636 (1988-01-01), Benner
patent: 4754149 (1988-06-01), Wang
patent: 4820281 (1989-04-01), Lawler

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