Browse Prior Art Database

Partitioned Drop-On-Demand Generator

IP.com Disclosure Number: IPCOM000041523D
Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Cappelletti, W: AUTHOR [+4]

Abstract

A drop generator for a drop-on-demand ink jet print head uses a partition in the print head cavity to separate corrosive ink from the piezoelectric (PZT) driver.

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 100% of the total text.

Page 1 of 2

Partitioned Drop-On-Demand Generator

A drop generator for a drop-on-demand ink jet print head uses a partition in the print head cavity to separate corrosive ink from the piezoelectric (PZT) driver.

In the figure above, the print head cavity is split into two sections by a membrane 10. The front section 12 is conical in shape.

The tip of the cone is located at the nozzle plate 14. The fluid in the front section is ink which is supplied through inlet port 15. The rear section 16 of the cavity is cylindrical in shape. A portion of this section's wall includes a cylindrical PZT element 18. The material in section 16 is inert, having substantially the same acoustic impedance as the ink in front section 12. In operation, PZT element 18, when energized, generates a pressure wave traveling in rear section 16 toward front section 12. Membrane 10 transmits this wave to the ink in front section 12. The conical shape of front section 12 concentrates the energy of the wave as it moves forward to eject a drop out of the nozzle. Membrane 10 might be either
.025 mm polyethylene or .038 mm polyester. Any material that will transmit the pressure wave with very little loss in energy may be used. While front section 12 has been shown as a conical cavity, it is not necessary to have a converging cavity behind nozzle plate 14. A nonconverging cavity for front section 12 will also work well.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text objects]