公开(公告)号：DE2842755A1

公开(公告)日：1979-04-12

申请号：DE2842755

申请日：1978-09-30

Applicant: IBM

Inventor： GIORDANO FRANCIS PETER ,  KUHN LAWRENCE ,  LANE RAMON ,  LEE CHEN-HSIUNG ,  ZIERDT GENE OVERHOLTS ,  SAN JOSE CALIF

IPC: B41J2/02 ,  B41J2/025 ,  B41J3/04

Abstract: An ink jet printing head comprising a head body made from a material having high specific stiffness and the head body includes an ink passage which is kept small to retain the high body stiffness. The ink passage comprises a narrow slot connected with internal holes in the body which lead to ink inlet and exit ports. A nozzle plate having a plurality of orifices is fixed to the front of the head body and a piezoelectric crystal is fixed to the back of the head body. The piezoelectric crystal is kept thin compared to the head thickness, typically on the order of 1/20 to 1/30 of the body thickness, so that the effect of the crystal on the resonant characteristics of the assembly is kept small. The ink jet head provides a plurality of columns or jets of ink which are excited in such a way as to break up into uniformly and equally spaced drops at a fixed distance from the nozzle plate containing the orifices which produce the jets.

公开(公告)号：DE3279880D1

公开(公告)日：1989-09-14

申请号：DE3279880

申请日：1982-05-13

Applicant: IBM

Inventor： GIORDANO FRANCIS PETER ,  HENSHAW ROBERT JOSEPH

IPC: B41J2/40 ,  H04N1/40

Abstract: An electrostatic gray scale printing system is disclosed having particular utility for producing gray scale images from signals received from a suitable data source such as a computer, telecommunications line, data storage device or the like. A unique, high voltage, pulse generating circuit is provided for producing gray scale voltage pulses between 300 and 600 volts to the individual styluses making up said printing device. The circuit utilizes a low voltage, power supply and a low voltage gray scale intensity signal input to produce the required high voltage printing pulses. The circuit, per se, consists of a high voltage transistor (Q1) having a relatively large inductance (L) connected in its emitter-collector circuit path. Current flows in the transistor Q1 in response to an input voltage applied to the base of the transistor Q1. The collector current is proporational to the value of the input signal V B divided by the emitter resistor R E . When the transistor Q1 is cut off the inductive tank circuit (L, R I ) produces a high voltage output pulse proportional to the original signal V E placed on the transistor base. The width of said output pulse is related to the value of the resistor R, in the inductive tank circuit which also controls the damping of the output pulse. Coded digital gray level signals are applied to digital to analogue converter 14 and the analogue signals are supplied to a multiplexer 17. The multiplexed output signals are selectively gated to a series of operational amplifiers, such as amplifier A1, as control signals. Each amplifier controls a high voltage transistor, such as transistor 01, and gives rise to an appropriate magnitude drive pulse.

公开(公告)号：DE2755610A1

公开(公告)日：1978-06-22

申请号：DE2755610

申请日：1977-12-14

Applicant: IBM

Inventor： GIORDANO FRANCIS PETER ,  HENDRIKS FERDINAND

IPC: B41J2/075 ,  B41J2/02 ,  B41J3/04

Abstract: There is described a droplet aspirator for an ink jet printer. The aspirator includes a housing having a tunnel therein, which is spaced from an ink jet nozzle which emits an ink jet stream which passes through the tunnel. A gas stream is also directed through the tunnel at substantially the same velocity as the ink jet stream for reducing the aerodynamic effects on adjacent ink droplets. The tunnels cross-sectional area is substantially constant from one plane to the next when measured in any given plane transverse to the longitudinal axis, for maintaining the velocity of the gas stream constant. The tunnel has a circular cross-section when used in a nozzle per spot system, and when used in an analog deflected system, has an entrance of one geometry, with the tunnel changing in geometry along its longitudinal axis to a different geometry at its exit. Preferably, in the analog deflected system, the entrance geometry is circular and the exit geometry is elliptical or rectangular.