Recorders – Performance of multiple functions of steam and gas engines – Pressure responsive element
Patent
1982-03-15
1983-07-05
Griffin, Donald A.
Recorders
Performance of multiple functions of steam and gas engines
Pressure responsive element
346 75, 346140R, G01D 1518
Patent
active
043921426
ABSTRACT:
An ink jet printer having improved droplet sensing apparatus for calibrating the printer. The improved apparatus defines a number of sensing sites each having first and second light sources for directing light signals through a sensing zone and a single fiber optic light pipe leading away from the sensing zone to circuitry for detecting the presence of ink droplets in that sensing zone. The preferred apparatus includes two light emitting diodes, each of which generate visible light signals of different wavelengths. These two light signals are received by an output light pipe and travel together along the right pipe to means for detecting the intensity of the two signals and determining droplet positioning in the sensing zone as a function of the two intensities. One apparatus for differentiating between the two light intensities comprises first and second photo detectors which respond to the wavelength light generated by the two light sources. The output from these two detectors are then routed to a difference amplifier which gives an indication of droplet position as a function of time. A second way of sensing the intensities is to time multiplex the sources so that only one source illuminates the droplet at a given time. These intensities are then stored in a sample and hold circuit and compared with a difference amplifier in a manner identical to the multiple wavelength sensing embodiment.
REFERENCES:
patent: 3633035 (1972-06-01), Uchida
patent: 3925727 (1975-12-01), Duguay
patent: 4255754 (1981-03-01), Crean et al.
patent: 4260883 (1981-04-01), Onoda et al.
patent: 4272189 (1981-06-01), Bailey et al.
patent: 4364055 (1982-12-01), Aiba
Price Edgar E.
Seachman Ned J.
Beck John E.
Griffin Donald A.
Schultz Stephen J.
Xerox Corporation
LandOfFree
Ink jet droplet sensing method and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ink jet droplet sensing method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ink jet droplet sensing method and apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1442654