Inkjet drop generator

Details Inkjet drop generator Inkjet drop generator

1987-03-19

1990-09-18

Reynolds, Bruce A.

Recorders

Record receiver deforming

346140R, G01D 1518

Patent

active

049581686

ABSTRACT:
An inkjet printer applies symmetrical driver vibrations to the full length of a linear nozzle array. A nozzle array and nozzle support plate are supported on the end of a supporting housing which also supports a plate for defining an ink flow cavity. The housing also defines an acoustic cavity which extends from the ink cavity to an end of the acoustic transducer and is filled with acoustically transmissive material. A transducer is bonded to the distal end of this acoustic material, so that when the transducer is energized, the vibrations are transmitted uniformly through the acoustically transmissive material and the acoustic cavity to the ink cavity, symmetrically driving the ink out through the nozzles of the nozzle plate. It has been found that the acoustic cavity in fact has a critical length which is related to the frequency of operation of this system. Specifically, for a frequency of 110 KHz, the length of the acoustic cavity should be 4.7 mm; for an operating frequency of 120 KHz, the length of the acoustic cavity from the ink cavity to the face of the transducer should be 4.2 mm. In order to produce uniform vibrations at the face of the transducer, grooves extend up from the distal end of the transducer about 9/10 of the way to the surface of the transducer which is bonded to the aroustic cavity material. These grooves should have a width of about 0.56 mm.

REFERENCES:
patent: 4138687 (1979-02-01), Cha et al.
patent: 4380018 (1983-04-01), Andoh et al.
patent: 4587528 (1986-05-01), Beaudet
patent: 4703330 (1987-10-01), Culpepper

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