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US 4,384,231 AGranted
Piezoelectric acoustic transducer with spherical lens
AssigneeHitachi, Ltd.
InventorsIsao Ishikawa, Hiroshi Kanda, Toshio Kondo
Life of this patent
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Abstract
An acoustic spherical lens wherein a hemispherical hole is formed from a bubble which appears owing to the expansion of resudual gases in a lens material employing silica, and the hemispherical hole is used as a lens surface.
Claims6
An acoustic spherical lens comprising:
- propagating means for forming a solid acoustic energy propagating medium;
- and
- piezoelectric transducer means for generating acoustic energy disposed on one side of the propagating means,
- wherein the other side of the propagating means is provided with the shape of a concave spherical surface comprising a bubble surface formed by gaseous expansion in said propagating means and a taper surface except in the region of the concave spherical surface.
1 more element
Dependencies are inferred from the claim text.