 Anti-fouling compositions |
| I claim: 1. In a marine anti-fouling liquid paint composition containing resin, marine toxin and ... |
|
| Thick film resistor element with coarse and fine adjustment provision |
| It is an object of the present invention to provide a thick film resistance element especially ... |
|
| Process enhancement using molybdenum plugs in fabricating integrated circuits |
| OF ILLUSTRATIVE EMBODIMENTS The use of a moly plug in accordance with the invention allows ... |
|
| Light emitting diode transmitter circuit with temperature compensation |
| I claim: 1. A light emitting diode circuit having first, second and third nodes comprising, first ... |
|
| Thin film resistor and method for producing same |
| OF THE INVENTION FIG. 1 is the schematic view of a semiconductor structure with a resistor mounted ... |
|
| Multichannel amplifier with gain matching |
| It is a principal object of the present invention to provide a multichannel amplifier with accurate ... |
|
| Method and apparatus for accurate, high speed pulse-echo measurement calibration |
| An apparatus for time-based measurements comprises, in general form, a receiver for receiving an ... |
|
| Anhydrous kaolin clay pigment and method of preparation |
| We claim: 1. An anhydrous white kaolin clay pigment having high light scattering when incorporated ... |
|
| Pressure-contact sealing arrangement for a semiconductor pellet |
| It is an object of the present invention to provide a semiconductor device which simplifies the ... |
|
| Means for mounting membrane switches to cathode ray tubes |
| What is claimed is: 1. A membrane switch having mounting means for mounting the switch to a cathode ... |
|
|
Ink-drop print-head
| Details |
Inventors: Taylor, Terrence F. E.; Bansal, Vishwa N.; Raby, Peter T. C.;
Assignee: International Standard Electric Corporation (New York, NY)
Primary Examiner: Hartary; Joseph W.
Assistant Examiner:
Attorney, Agent or Firm: Stolzy; A. Donald
A drop-on-demand ink-drop printer (as opposed to a continuous-droplet-stream printer) has a printhead through which ink flows continuously. In the vicinity of the orifice through which drops are expelled there is a constriction, for instance a Venturi tube, which (a) maintains a negative meniscus at the orifice, and (b) prevents any accumulation of detritus or gas at the orifice. The ink drop is expelled by some form of shock-wave producing means. |
|
DETAILED DESCRIPTION We claim: 1.
A print-head for an on-demand ink drop printer comprising an orifice plate, a back wall and a side wall member which together bound a chamber which has a restriction in the vicinity of the orifice in the orifice plate; an inlet to the chamber; an outlet from the chamber; shock wave producing means effective to produce, through a wall of the chamber, a shock wave in the chamber; and means for maintaining a continuous flow of ink through the chamber such that ink is contained in the orifice with a negative meniscus except when a shock wave is produced whereupon a single droplet of ink is ejected from the orifice, the side wall member having a cutout interior shaped like an hour glass to give a Venturi-tube effect, the constriction being arranged to be aligned with the orifice in the orifice plate, the inlet entering the chamber on one side of the constriction, the outlet leaving the chamber on the other side of the constriction.
2.
A printhead as claimed in claim 1 wherein the shock wave producing means is a pair of piezoelectric motors attached, one on either side of the constriction, to the back wall.
3.
A printhead as claimed in claim 1 wherein the shock wave producing means is a single piezoelectric motor attached to the back wall on the opposite side of the constriction from the orifice, and wherein the material of the side wall member is sufficiently compliant not to diminish the effect of the shock wave.
Description:
This invention relates to ink jet printers.
Most ink-jet printers produce a continuous stream of droplets directed at a record web and deflect the stream to draw characters in either an analogue fashion or a digital fashion.
Recently there have been proposals to produce a printer in which the droplets are not produced in a stream but "on demand.
" See, for example, the proposal of N.
G.
E.
Stemme in the United Kingdom Pat.
specification No.
1,356,704, in which a piezo-electric motor "kicks" a droplet of ink from an orifice connected to a reservoir
|
| Related patents |
|
|
Ink jet printing using horizontal interlacing
What is claimed is: 1. A method of printing on an image-receiving surface using an oscillating bar ink jet printer, which comprises: (a) advancing said image-receiving ...
|
|
|
Liquid jet device with cleaning protective means
It is a primary object of the present invention to provide a liquid jet device which eliminates the disadvantages peculiar to the liquid jet device according to the ...
|
|
|
Semiconductor heat sink assembly including thermally responsive means for increasing compression as the temperature of said assembly increases
We claim: 1. A semiconductor assembly for facilitating electrical connection and double-side cooling of said semiconductor, comprising: a semiconductor element having ...
|
|
|
Ink jet printing apparatus and process
It is, therefore, an object of the present invention to provide an ink jet printing apparatus suitable for printing large size alpha-numeric characters on a moving ...
|
|
|
Thermal printing system
Accordingly, an object of the present invention is to provide a thermal printing system and a thermal printing head apparatus which are easy to operate, simple in ...
|
|
|
6-tetrahydrofurfurylaminofluoran compound useful as a color former
We claim: 1. A 6-tetrahydrofurfurylaminofluoran compound of the formula (I): R1 ? ? ##STR24## wherein R.sub.1 represents a member selected from the group consisting of a ...
|
|
|
Optical floppy disc data storage and retrieval techniques
It is an object of the present invention to store and retrieve information of the type set forth in the Gokey et al applications on a microdisc such that skew and ...
|
|
|
Lithographic ink composition and process for making same
OF THE PREFERRED EMBODIMENT The present invention pertains to an ink composition having at least 0.1 percent, based on weight of ink composition, of a pH-stabilizing ...
|
|
|
Sample cell window cleaning device
An object of the present invention is to provide a cell cleaning device, the moving parts of which are located within the sample cell chamber and therefore avoids the ...
|
|
|
Monitoring camera
OF THE PREFERRED EMBODIMENT Referring to the FIGURE, it may be seen that a monitoring camera generally denoted as 1 is mounted on a wall 3 of a submersible pressure ...
|
|
|
TV Signal 
