On chip conductive fluid sensing circuit

Details On chip conductive fluid sensing circuit On chip conductive fluid sensing circuit

1988-08-15

1989-08-01

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

324 60CD, 340618, G01D 1516

Patent

active

048537187

ABSTRACT:
The ink in an ink jet is sensed by a capacitor, one plate of which is coupled to ground through the ink. The absence of ink will appear as a decreased amount of capacitance. In this case the charge of the capacitor will leak off faster, and a sample and hold circuit can sense this to output a signal indicating the absence of ink. The charging signal can either be generated on the chip, which is made from silicon, or can be supplied to the chip. The number of pins on the chip taken for this sensing function can be minimized by multplexing the states of signals supplied to the chip for other purposes to generate the necessary signals to control and operate this sensor.

REFERENCES:
patent: 4550327 (1985-10-01), Miyakawa
patent: 4700754 (1987-10-01), Kringe
Phillips, D. W.; Capacitive Ink Level Detector, IBM TDB, vol. 16, No. 10, Mar. 1974, pp. 3293-3294.

Affiliated with

Also associated with

Rating

On chip conductive fluid sensing circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with On chip conductive fluid sensing circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On chip conductive fluid sensing circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-134449