Acoustic ink printhead having reflection coating for improved in

Details Acoustic ink printhead having reflection coating for improved in Acoustic ink printhead having reflection coating for improved in

1989-10-03

1990-09-25

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

310335, B41V 204

Patent

active

049596748

ABSTRACT:
An acoustic ink printhead having improved ink drop ejection control includes a substrate having an array of acoustic lenses at its upper surface for bringing rf acoustic waves to a predetermined focus and a layer of acoustically reflective material of a thickness equal to an odd multiple of one quarter of the wavelength of the acoustic rf waves passing through it having openings corresponding to and positioned above each lens. Ink from an ink pool is allowed to couple acoustically to the lenses at each opening for receiving the focussed acoustic rf wave, while the layer acoustically isolates the interstitial regions between each lens by reflecting the acoustic rf waves incident on the upper surface of the substrate in those regions.

REFERENCES:
patent: 4006444 (1977-02-01), Quate et al.
patent: 4308547 (1981-12-01), Lovelady et al.
patent: 4321696 (1982-03-01), Kanda
patent: 4562900 (1986-01-01), Anderson et al.
patent: 4697195 (1989-09-01), Quate et al.
patent: 4719476 (1988-01-01), Elrod et al.
patent: 4719480 (1988-01-01), Elrod et al.
patent: 4751529 (1988-06-01), Elrod et al.
patent: 4751534 (1988-06-01), Elrod et al.
patent: 4782350 (1988-11-01), Smith et al.

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