Title: Method and apparatus for producing drops using a drop-on-demand dispenser

Abstract

A method and apparatus for dispensing fluid from a drop-on-demand (DOD) fluid dispenser. The method involves withdrawing fluid in the dispenser for a first duration of time, followed by a second duration of time during which the fluid is propelled toward the orifice of the dispenser. Following the period during which the fluid is propelled, there is a second withdrawing of the fluid into the dispenser. The duration of the propelling period is shorter than the duration of either the first withdrawing or the second withdrawing. The propelling of the fluid results in the extension of a small tongue of fluid from the meniscus of the fluid. The second withdrawing of the fluid results in a retraction of the meniscus into the passageway such that only the small tongue of fluid separates and is ejected from the dispenser.

Inventors:

Chen, Alvin U.; Basaran, Osman A.

Issue Date:

Wed Jan 01 00:00:00 EST 2003

Research Org.:

Purdue Univ., West Lafayette, IN (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

875015

Patent Number(s):

6513894

Application Number:

09/716,576

Assignee:

Purdue Research Foundation (West Lafayette, IN)

Patent Classifications (CPCs):

B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY

B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01L - CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE

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B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY

B01J2219/00274 - Sequential or parallel reactions

B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01L - CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE

B01L2400/02 - Drop detachment mechanisms of single droplets from nozzles or pins
B01L2400/021 - non contact spotting by inertia, i.e. abrupt deceleration of the nozzle or pin
B01L2400/0433 - vibrational forces
B01L3/0268 - {using pulse dispensing or spraying, eg. inkjet type, piezo actuated ejection of droplets from capillaries}

B - PERFORMING OPERATIONS B41 - PRINTING B41J - TYPEWRITERS

B41J2/04581 - {controlling heads based on piezoelectric elements}
B41J2/04588 - {using a specific waveform}

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DOE Contract Number:  

FG02-96ER14641

Resource Type:

Patent

Resource Relation:

Patent File Date: 2000 Nov 20

Country of Publication:

United States

Language:

English

Subject:

/347/