Browse Prior Art Database

Ink Jet Printer

IP.com Disclosure Number: IPCOM000085064D
Original Publication Date: 1976-Feb-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 3 page(s) / 51K

Publishing Venue

IBM

Related People

Twardeck, TG: AUTHOR

Abstract

This ink jet printer prints on the interior of a print drum. Viewed as an output printer of a facsimile station, the advantages include (1) elimination of a revolving print drum, (2) elimination of a variable-frequency head, and (3) employment of an ink jet diagnostic apparatus in development and operation phases.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

Page 1 of 3

Ink Jet Printer

This ink jet printer prints on the interior of a print drum. Viewed as an output printer of a facsimile station, the advantages include (1) elimination of a revolving print drum, (2) elimination of a variable-frequency head, and (3) employment of an ink jet diagnostic apparatus in development and operation phases.

The system includes a printer system which generates and charges ink drops, employs a rotating electric deflection field to displace the electrically charged drops in any radial direction from the undeflected stream, and prints these drops on the interior of a print drum.

Fig. 1 shows the basic components of the ink drop generator and deflector portions of the printer. Generator 1 generates an ink stream which breaks-up into regularly spaced and uniformly sized droplets 2. Generator 1 is composed of a pipe which supplies ink, a piezoelectric crystal which perturbs the stream and causes drop formation at the desired rate, and an orifice through which the stream issues.

At the time of stream-to-drop separation, an electric charge may be induced on the forming drop by (1) applying a voltage to a charge electrode 3 which is positioned near the stream-drop not applying a voltage to the charge electrode as the drop is formed, or (2) applying a small voltage to overcome the induced charge caused by the charge on preceding drops. As the array of charged and uncharged drops travel down stream, the drops encounter a rotating electric field supplied by deflector 4.

In one configuration, deflector 4 may be composed of four opposing flat plate electrodes as shown in Figs. 2a and 2b. One possible pair of voltages which must be applied to two electrodes of deflector 4 are shown in Figs. 3a and 3b. Figs. 3a and 3b also show the instantaneous direction of the resultant electric field at the center of deflector 4, for various points along the impressed voltage waves.

Over o...