US 4,380,018 A · Ink droplet projecting device and an ink jet printer

Abstract

An on-demand type ink jet printer, and an ink droplet projecting device used in this printer are disclosed. This device operates in the following way: a piezo-electric element transmits the pressure generated by its vibration first to the pressure transmitting medium of a non-solid matter; through this medium, the pressure is transmitted to the passive vibrating means being in contact with the ink to be projected, and facing the orifice through which ink is projected, thereby vibrating this vibrating means, and by the pressure generated by the vibration, ink is projected through the orifice. With such a structure, the assembling work of this device is easy; uniform projection characteristics are achieved, and moreover, the problem of air suction with resultant projection failure is eliminated.

Claims19

Dependent claims

An ink droplet projecting device comprising:

a pressure generating means which vibrates in response to an electric signal;
a pressure cell, a part of the side wall thereof being composed of said pressure generating means and a passive vibrating means which has a smaller area than that of the pressure generating means;
transmission medium filled in said pressure cell to transmit the vibration of the pressure generating means to the passive vibrating means;
and
a means for holding an ink layer on the passive vibrating means on the exterior side of said pressure cell;
whereby the pressure generated by the vibration of the pressure generating means is concentrically given to the passive vibrating means through the transmission medium, the passive vibrating means vibrates thereby, and by this vibration, each ink droplet is projected from the ink layer.

3 more elements

Dependencies are inferred from the claim text.

Ink droplet projecting device and an ink jet printer

Life of this patent

Ink droplet projecting device and an ink jet printer

Life of this patent

Abstract

Claims19