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Ultrasonic atomizer, ultrasonic inhaler and method of controlling same

  • US 6,651,650 B1
  • Filed: 10/04/1994
  • Issued: 11/25/2003
  • Est. Priority Date: 04/09/1992
  • Status: Active Grant
First Claim
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1. An ultrasonic atomizer comprising:

  • an ultrasonic pump comprising a pump shaft having an upper end, a lower end, and a pump bore passing axially through said pump shaft to form openings in the upper and lower ends, said ultrasonic pump further comprising an ultrasonic vibrator mounted on said pump shaft substantially at a midpoint thereof with respect to the axial direction of said pump shaft;

    a liquid vessel arranged such that it is penetrated by a lower end of said pump shaft;

    a mesh plate placed on a face of the upper end of said pump shaft, said mesh plate having a plurality of minute holes; and

    a resilient biasing member for biasing said mesh plate toward the upper end face of said pump shaft, said mesh plate intermittently contacting the upper end face of said pump shaft, wherein the upper end face of said pump shaft comprises a shape in which the upper end face is slightly and smoothly curved so as to attain maximum height at the position of the opening in the upper end of the pump bore and to diminish in height as the periphery is approached.

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