Incremental printing of symbolic information – Ink jet – Controller
Reexamination Certificate
1998-12-17
2001-10-23
Barlow, John (Department: 2861)
Incremental printing of symbolic information
Ink jet
Controller
Reexamination Certificate
active
06305777
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an apparatus and method for the measurement of a liquid droplet, and, more particularly to an apparatus and method for providing quantitative information about liquid droplets ejected by ink jet printer heads.
BACKGROUND OF THE INVENTION
In an ink jet printer, ink is supplied to a printer head which has a plurality of nozzles for ejecting droplets of ink onto a sheet of paper or the like to print words, pictures, etc. The characteristics of the ink droplets, such as the size, shape, velocity and frequency and stability of the droplet formation effect the characteristics of the lines, etc. which are printed. Therefore it would be desirable to be able to measure the various characteristics of ink droplets as ejected from a printer head to be able to determine how to control the printer head to achieve a print of desired characteristics.
SUMMARY OF THE INVENTION
A liquid droplet measuring apparatus includes means for generating and projecting a beam of illumination, and means for forming a portion of the beam into the shape of a sheet. Means is provided for forming and projecting a liquid droplet through the sheet portion of the beam of illumination. Means is also provided for detecting the beam after the droplet passes therethrough.
The method of the present invention for measuring a liquid droplet includes forming and projecting a beam of illumination along a path. A portion of the beam is formed into the shape of a sheet. A liquid droplet is projected through the sheet portion of the beam of illumination. The beam after the droplet passes therethrough is measured to determine a characteristic of the droplet.
REFERENCES:
patent: 4429995 (1984-02-01), Goulas
patent: 4751517 (1988-06-01), Crean et al.
patent: 5430306 (1995-07-01), Ix
patent: 5637881 (1997-06-01), Burghard et al.
Barlow John
Burke William J.
Sarnoff Corporation
Stewart Jr. Charles W.
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