Browse Prior Art Database

Ink on Demand Printing and Copying Employing Combined Ultrasonic and Electrostatic Control

IP.com Disclosure Number: IPCOM000083819D
Original Publication Date: 1975-Jul-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Mitchell, JL: AUTHOR [+2]

Abstract

This is an ink on demand ink jet printer in which jet formation is triggered ultrasonically, rather than by increasing the high voltage applied to a valving electrode.

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 64% of the total text.

Page 1 of 2

Ink on Demand Printing and Copying Employing Combined Ultrasonic and Electrostatic Control

This is an ink on demand ink jet printer in which jet formation is triggered ultrasonically, rather than by increasing the high voltage applied to a valving electrode.

Ink is housed in a reservoir 2 situated adjacent an ink jet head 4 having an exit aperture 6 formed therein. A high-voltage electrode 8 having an orifice 9 therein, has a high voltage on the order of 2-4 KV applied thereto by way of a voltage source 10. An acceleration electrode 12 has high voltage on the order of 7000 volts applied thereto from a source 14. A printing medium 16 is situated intermediate the electrodes 8 and 12. The voltage from the electrode 8 causes a meniscus 17 to be formed about the orifice 6.

When it is desired to provide a drop of ink from the orifice 6, ultrasonic energy is applied from a source 18 on command of the modulator 20 and the pulse of ultrasonic energy is applied locally at the meniscus, via a bundle of fine wires 22, which causes an ink droplet to be perturbed outward from the meniscus 17.

The combined electrostatic and hydrostatic forces are not sufficient to cause leakage of the ink or formation of a jet. However, if the meniscus is perturbed outward, the electrostatic field is sufficient to cause an instability in the meniscus to grow until a droplet is pulled off. The droplet formed can be an order of magnitude smaller in diameter than the meniscus.

X and Y deflection e...