Acousto-electric transducer
AssigneeHewlett-Packard Company
InventorJ. Fleming Dias
Life of this patent
Estimating the term…
Abstract
An array of transducers is mounted on a base and means are provided for causing surface waves that emanate in opposite directions along the base to be reflected by transducers on either side so as to follow paths of respectively different lengths in going to the adjacent transducers and back to the transducer from which they emanated, the difference in path lengths being such that the surface waves return to the transducer from which they emanated out of phase with each other. The means can be comprised of grooves or spaces between pairs of transducers.
Claims6
An array of acousto-electric transducers, comprising
- a base,
- an array of planar transducers mounted on said base in spaced parallel relationship, said transducers vibrating at a given resonant frequency in a plane perpendicular to said base when excited, and
- means for causing surface waves that emanate in opposite directions along said base to be reflected by transducers on either side so as to follow paths of respectively different lengths in going to the adjacent transducers and back to the transducer from which they emanated, the difference in path lengths being such that the surface waves return to the transducer from which they emanated out of phase with each other.
An acousto-electric transducer array, comprising
- a base of material for absorbing acoustic energy,
- a plurality of planar transducers mounted on said base in spaced parallel relationship, and
- means defining grooves in said base between adjacent pairs of transducers and grooves in said base between transducers of each pair such that surface waves emanating along said base from each transducer and reflected by adjacent transducers return to each transducer substantially out of phase.
An acousto-electric transducer array, comprising
- a base of material for absorbing acoustic energy,
- a plurality of planar transducers mounted on said base in spaced parallel relationship, and
- each pair of transducers being mounted at a distance along the base from the pairs of transducers on either side that is greater than the distance between the transducers of the pair.
Dependencies are inferred from the claim text.