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US 4,308,547 AGranted
Liquid drop emitter
AssigneeRecognition Equipment Incorporated
InventorsKenneth T. Lovelady, Larimore F. Toye
Life of this patent
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Abstract
A liquid drop emitter utilizing acoustical principles ejects liquid from a body of liquid onto a moving document to form characters or bar codes thereon.
Claims3
A nozzleless ink jet printing apparatus wherein controlled drops of ink are propelled from an unbounded ink surface by an acoustical force produced by a curved transducer at or below the surface of said ink, the improvement comprising a homogeneous piezoelectric crystal and means on said crystal for altering the focal point of said crystal to selectively propel said ink drops in a desired direction.
Dependencies are inferred from the claim text.