Drop on demand print head with fluid stagnation point at...

Details Drop on demand print head with fluid stagnation point at... Drop on demand print head with fluid stagnation point at...

2011-08-16

2011-08-16

Mruk, Geoffrey (Department: 2853)

Incremental printing of symbolic information

Ink jet

Fluid or fluid source handling means

C347S068000, C347S085000

Reexamination Certificate

active

07997709

ABSTRACT:
A drop on demand ink jet print head has a chamber with a plurality of liquid passages into and out of said chamber, such that liquid is continuously moved into the chamber to a stagnation point adjacent to the nozzle opening, whereat the fluid comes substantially to rest, and out of the chamber from the stagnation point such that vector sum of liquid flow derived forces within the liquid channels is neutral. An actuator associated with the chamber is adapted to selectively increase the pressure of the liquid at the stagnation point to thereby eject a liquid drop from the nozzle opening. Continuous fluid flow internal to the system decreases the time to refill the fire chamber directly behind the nozzle opening after droplet ejection. This in turn dramatically increases the response time of the system.

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IBM Technical Disclosure Bulletin, vol. 31, No. 6, Nov. 1988.

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