초록 ▼

A low cost digitally operated dispenser apparatus and method of operation and construction is obtained by combining flat sided, preferably rectangular tubular capillary tube having an orifice, with a flat elongated strip of piezoelectric material. Microdroplets are dispensed from an internal chamber

A low cost digitally operated dispenser apparatus and method of operation and construction is obtained by combining flat sided, preferably rectangular tubular capillary tube having an orifice, with a flat elongated strip of piezoelectric material. Microdroplets are dispensed from an internal chamber within the capillary tube, or a separate feed supply, upon application of voltage pulses through electrodes connected to conductive layers on the piezoelectric material. The piezoelectric strip may be parallel to the flat capillary tube or perpendicular to it. On a variation, a fixture can be used to improve performance in combination with the capillary tube and piezoelectric strip. A standoff strip allows the piezoelectric operator to be thermally isolated from a flat rectangular capillary tube.

대표청구항 ▼

1. A method of operating a low cost dispensing device, comprising the steps of:providing a dispensing device having a capillary tube having flat sides and a strip of piezoelectric material in operative contact with a flat side of the capillary tube, the capillary tube having an orifice and dispensin

1. A method of operating a low cost dispensing device, comprising the steps of:providing a dispensing device having a capillary tube having flat sides and a strip of piezoelectric material in operative contact with a flat side of the capillary tube, the capillary tube having an orifice and dispensing liquid to be dispensed; applying cyclical voltage pulses to the piezoelectric strip, of an intensity and duration sufficient to dispense droplets of dispensing liquid from the orifice.