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AssigneeKoninklijke Philips Electronics N.V.
InventorsJie Chen, Rajesh Kumar Panda, Turuvekere R. Gururaja, Heather Beck
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This invention is directed to a transducer comprising a lead-based single crystal wherein the crystal is diagonally oriented and has an effective coupling constant of at least 0.70. In one embodiment, the lead-based crystal has the formula Pb(B′B″)O3—PbTiO3 wherein B′ is Mg2+, Zn2+, Ni2+ or Sc3+ and B″ is Nb5+, Ta5+ or W6+. Preferably, the lead-based crystal is of the formula Pb(B′B″)O3—PbTiO3 where B′ is Mg2+, Zn2+, Sc3+ and B″ is Nb5+ or more specifically Pb(Mg⅓Nb⅔)O3—PbTiO3 (“PMN-PT”), Pb(Zn⅓Nb⅔)O3—PbTiO3 (“PZN-PT”), and Pb(Sc⅓Nb⅔)O3—PbTiO3 (“PSN-PT”). The invention also includes a transducer comprising a plurality of lead-based single crystal transducers. In one embodiment the ultrasonic probe comprising one or more piezoelectric components having surfaces that function as transmitting and/or receiving elements; and electrodes placed upon opposite surfaces of the elements, and wherein each lead based piezoelectric component as described above. In addition, the invention includes improved materials for reduced spurious modes. Furthermore, the invention includes diagonally oriented lead-based transducers.
A transducer comprising a lead-based single crystal wherein the longitudinal or thickness direction of the crystal is diagonally oriented and has an effective coupling constant of at least 0.70.
A transducer comprising a lead-based single crystal wherein the longitudinal or thickness direction of the crystal is diagonally oriented and has an effective coupling constant of at least 0.70 wherein the ratio of the crystal length to thickness to width is from about (300 to 15):(5 to 1):(5 to 1).
A transducer comprising a lead-based single crystal orientated slightly off the <001> orientation wherein the longitudinal or thickness direction of the sample is cut from 2 to about 20 degrees off the <001> orientation and the coupling constant is greater than 0.75.
A transducer comprising a lead-based single crystal orientated slightly off the <001> orientation wherein the longitudinal or thickness direction of the sample is cut from 2 to about 15 degrees off the <001> orientation and the coupling constant is greater than 0.80.
A transducer comprising a lead-based single crystal orientated in about the <001>t/<010>w orientation wherein the sample is cut from 2 to about 15 degrees off the width orientation and the ratio of the crystal length to thickness to width is from about (300 to 15):(5 to 1):(5 to 1).
A transducer comprising a lead-based single crystal wherein the sample is cut from 15 to about 25 degrees off the <010> width directions and the ratio of the crystal length to thickness to width is from (300 to 15):(5 to 3):(2 to 1).
An ultrasonic transducer comprising:
An ultrasonic transducer comprising:
An ultrasonic probe comprising:
A transducer comprising lead-based diagonally oriented polycrystalline material.
A transducer comprising a lead-based single crystal wherein the crystal is oriented in the <011> orientation along the longitudinal or thickness direction.
Dependencies are inferred from the claim text.