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US 2017/0365771 A1Published application
Piezoelectric element, ultrasound probe and ultrasound imaging apparatus
AssigneeKonica Minolta, Inc.
InventorsMasashi OZAWA, Hisashi MINEMOTO, Junichi KATO, Koetsu SAITO
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Abstract
The ultrasound probe includes a piezoelectric element including a piezoelectric composition and an electrode that applies a voltage to the piezoelectric composition. The piezoelectric composition has piezoelectric characteristics expressed by any coordinates included in a region formed by a polyhedron having a plurality of predetermined points as vertexes in Cartesian coordinates (keff, ε33S, Ec) including variables keff, ε33S and Ec.
Claims36
An ultrasound probe comprising:
- a piezoelectric element comprising a piezoelectric composition and an electrode that applies a voltage to the piezoelectric composition, and
- an acoustic back layer acoustically coupled to the piezoelectric element and disposed on a back surface of the piezoelectric element, wherein
- the piezoelectric composition has piezoelectric characteristics expressed by any coordinates included in a region formed by a polyhedron having point A1 to point A18 shown below as vertexes in Cartesian coordinates (keff, ε33S, Ec) comprising variables keff, ε33S and Ec when an effective electromechanical coupling coefficient, a bound relative permittivity and a coercive electric field thereof are defined as keff, ε33S and Ec (kV/cm), respectively:
- Point A1 (0.5, 2200, 18)
- Point A2 (0.5, 1400, 18)
- Point A3 (0.7, 600, 18)
- Point A4 (0.9, 600, 18)
- Point A5 (0.9, 2200, 18)
- Point A6 (0.5, 2200, 15)
- Point A7 (0.5, 1400, 15)
- Point A8 (0.7, 600, 15)
- Point A9 (0.9, 600, 15)
- Point A10 (0.65, 2200, 10)
- Point A11 (0.65, 1400, 10)
- Point A12 (0.8, 600, 10)
- Point A13 (0.9, 600, 10)
- Point A14 (0.75, 2200, 7)
- Point A15 (0.75, 1400, 7)
- Point A16 (0.8, 1000, 7)
- Point A17 (0.9, 1000, 7)
- Point A18 (0.9, 2200, 7).
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An ultrasound probe comprising:
- a piezoelectric element comprising a plurality of piezoelectric compositions and an electrode that applies a voltage to each of the plurality of piezoelectric compositions, a layer of each of the piezoelectric compositions and the electrode being alternately stacked, wherein
- the piezoelectric composition has piezoelectric characteristics expressed by any coordinates included in a region formed by a polyhedron having point B1 to point B14 shown below as vertexes in Cartesian coordinates (keff, ε33S, Ec) comprising variables keff, δ33S and Ec when an effective electromechanical coupling coefficient, a bound relative permittivity and a coercive electric field thereof are defined as keff, ε33S and Ec (kV/cm), respectively:
- Point B1 (0.5, 2200, 18)
- Point B2 (0.5, 600, 18)
- Point B3 (0.9, 600, 18)
- Point B4 (0.9, 2200, 18)
- Point B5 (0.5, 2200, 15)
- Point B6 (0.5, 600, 15)
- Point B7 (0.65, 2200, 9)
- Point B8 (0.65, 1000, 9)
- Point B9 (0.75, 600, 9)
- Point B10 (0.9, 600, 9)
- Point B11 (0.8, 2200, 7)
- Point B12 (0.8, 1000, 7)
- Point B13 (0.9, 1000, 7)
- Point B14 (0.9, 2200, 7).
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An ultrasound probe comprising:
- a piezoelectric element comprising a single-layer piezoelectric composition and an electrode that applies a voltage to the piezoelectric composition;
- and
- no acoustic back layer to be acoustically coupled to the piezoelectric element and disposed on a back surface of the piezoelectric element, wherein
- the piezoelectric composition has piezoelectric characteristics expressed by any coordinates included in a region formed by a polyhedron having point C1 to point C18 shown below as vertexes in Cartesian coordinates (keff, ε33S, Ec) comprising variables keff, ε33S and Ec when an effective electromechanical coupling coefficient, a bound relative permittivity and a coercive electric field thereof are defined as keff, ε33S and Ec (kV/cm), respectively:
- Point C1 (0.55, 2200, 18)
- Point C2 (0.55, 1400, 18)
- Point C3 (0.75, 600, 18)
- Point C4 (0.9, 600, 18)
- Point C5 (0.9, 2200, 18)
- Point C6 (0.55, 2200, 13)
- Point C7 (0.55, 1400, 13)
- Point C8 (0.75, 600, 13)
- Point C9 (0.9, 600, 13)
- Point C10 (0.6, 2200, 10)
- Point C11 (0.6, 1400, 10)
- Point C12 (0.8, 600, 10)
- Point C13 (0.9, 600, 10)
- Point C14 (0.75, 2200, 7)
- Point C15 (0.75, 1400, 7)
- Point C16 (0.8, 1200, 7)
- Point C17 (0.9, 1200, 7)
- Point C18 (0.9, 2200, 7).
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A piezoelectric element comprising:
- a piezoelectric composition comprising, as a main component, a composition represented by the following general formula, and an electrode that applies a voltage to the piezoelectric composition, wherein
- the piezoelectric composition satisfies the following expressions (1) to (3) when an electromechanical coupling coefficient, a bound relative permittivity and a coercive electric field thereof are defined as k33, ε33S and Ec (kV/cm), respectively:
- x[(Pba1Aa2){(M11/3Nb2/3)O3}]-y{(Pba1Aa2)TiO3}-z{(Pba1Aa2)ZrO3}
- wherein A represents Ba or Sr, M1 represents Mg, or Mg and Zn, and the following expressions (4) to (8) are satisfied:
- k33≧0.65 (1)
- ε33S≧1000 (2)
- Ec≧12 (3)
- 0≦a2≦0.1 (4)
- a1+a2=1 (5)
- x+y+z=1 (6)
- 0.1≦x≦0.375 (7)
- 0.5≦y/(y+z)≦0.64 (8).
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Dependencies are inferred from the claim text.