Patent US4440025A successfully refreshed from Google Patents.
US4440025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arc scan transducer array having a diverging lens
Assignee: Panasonic Holdings Corp
•
Filing: 1981-06-26
•
Granted: 1984-04-03
•
Expires: 2001-06-26
Abstract
Abstract An ultrasonic transducer array for arc scan imaging systems comprises a plurality of elongated piezoelectric transducers arranged successively to define a convexed energy radiating surface. A plano-concave acoustic diverging lens is attached to the convexed surface to diverge the acoustic energy transmitted from the transducers in an increased steering angle. The transducers are assembled on an impedance matching layer which defines the convexed radiating surface. The acoustic impedance of the diverging lens is substantially equal to the acoustic impedance of the human body, while the acoustic impedance of the impedance matching layer is greater than that of the human body.
Inventors
- 👤 Yoshihiro Hayakawa
- 👤 Tsutomu Yano
- 👤 Ryobun Tachita
- 👤 Hiroshi Fukukita
- 👤 Kazuyoshi Irioka
- 👤 Akira Fukumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:51
CPC Classifications
G; G01; G01S; G01S15/00; G01S15/88; G01S15/89; G01S15/8906; G01S15/8909; G01S15/8915; G01S15/892; B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0607; B06B1/0622; B06B1/0633; G10; G10K; G10K11/00; G10K11/02; G10K11/18; G10K11/26; G10K11/32
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
145 words
An ultrasonic transducer array for transmitting a diverging acoustic beam, comprising: a plurality of successively arranged, elongated piezoelectric transducers for generating an acoustic beam from different locations of said array; means for supporting said transducers on a generally convex surface so that said beam diverges from a first point located behing the array; and an acoustic diverging lens having a first curved surface that is complementary to said convex surface and a second, opposite surface that is generally flat and adapted to contact a body, said complementary curved surface of said lens being attached to said convex surface for diverging said acoustic beam outwardly to cause the acoustic energy transmitted from said transducers to emanate from a second point closer to said array than said first point enabling the array to scan a shallower region of the body than is achieved without said diverging lens.
Claim 2
Dependent Claim
145 words
An ultrasonic transducer array for transmitting a diverging acoustic beam, comprising: a plurality of successively arranged, elongated piezoelectric transducers for generating an acoustic beam from different locations of said array; means for supporting said transducers on a generally convex surface so that said beam diverges from a first point located behing the array; and an acoustic diverging lens having a first curved surface that is complementary to said convex surface and a second, opposite surface that is generally flat and adapted to contact a body, said complementary curved surface of said lens being attached to said convex surface for diverging said acoustic beam outwardly to cause the acoustic energy transmitted from said transducers to emanate from a second point closer to said array than said first point enabling the array to scan a shallower region of the body than is achieved without said diverging lens.
Claim 3
Dependent Claim
43 words
An ultrasonic transducer array as claimed in claim 1, wherein said acoustic diverging lens has a convexed surface as viewed in the longitudinal direction of said array to provide focusing of the acoustic energy in a direction normal to the direction of scan.
Claim 4
Dependent Claim
57 words
An ultrasonic transducer array as claimed in claim 1 or 2, wherein said acoustic lens comprises a material having substantially the same acoustic impedance as the acoustic impedance of the human body and having a characteristic such that in said acoustic lens the ultrasonic energy propagates at a speed lower than it propagates in said human body.
Claim 5
Dependent Claim
69 words
An ultrasonic transducer array as claimed in claim 1, wherein each of said piezoelectric transducers comprises a piezoelectric element and an impedance matching element which is secured to said piezoelectric element, further comprising an impedance matching layer secured between said impedance matching elements of the transducers and said acoustic diverging lens, said impedance matching layer having a lower acoustic impedance than the acoustic impedance of said impedance matching elements.
Claim 6
Dependent Claim
34 words
An ultrasonic transducer array as claimed in claim 4, wherein each of said impedance matching elements and said impedance matching layer have a greater acoustic impedance than the acoustic impedance of the human subject.
Claim 7
Dependent Claim
129 words
An ultrasonic diagnostic probe for transmitting a diverging acoustic beam into the body of an animate object, comprising: an array of piezoelectric transducers; and an acoustic lens having a concave surface on one side thereof and a generally flat opposite surface which makes contact with said animate object to define an entry surface thereto, wherein said transducers are successively arranged on said concave surface for transmitting acoustic beams from different locations of said array through different paths of said lens, said opposite surface of said lens diverging said beam outwardly on each side of an axis normal to said array at a point of entry to said animate object, thereby enabling the array to scan a shallower region of the animate object than is achieved without said diverging lens.
Claim 8
Dependent Claim
129 words
An ultrasonic diagnostic probe for transmitting a diverging acoustic beam into the body of an animate object, comprising: an array of piezoelectric transducers; and an acoustic lens having a concave surface on one side thereof and a generally flat opposite surface which makes contact with said animate object to define an entry surface thereto, wherein said transducers are successively arranged on said concave surface for transmitting acoustic beams from different locations of said array through different paths of said lens, said opposite surface of said lens diverging said beam outwardly on each side of an axis normal to said array at a point of entry to said animate object, thereby enabling the array to scan a shallower region of the animate object than is achieved without said diverging lens.
Claim 9
Dependent Claim
16 words
An ultrasonic diagnostic probe as claimed in claim 6, wherein said lens is a plano-concave lens.
Claim 10
Dependent Claim
32 words
An ultrasonic diagnostic probe as claimed in claim 6, wherein said opposite surface is convex as viewed in a longitudinal direction of said array to provide a focusing effect on said beam.
Claim 11
Dependent Claim
28 words
An ultrasonic diagnostic probe as claimed in claim 6, wherein said acoustic lens comprises a material having substantially the same acoustic impedance as that of said animate object.
Claim 12
Dependent Claim
60 words
An ultrasonic diagnostic probe as claimed in claim 6, further comprising a plurality of impedance matching elements each secured to each of said transducers and an impedance matching layer secured between said impedance matching elements and said concave surface of said lens, said impedance matching layer having a lower acoustic impedance than the acoustic impedance of said impedance matching elements.
Claim 13
Dependent Claim
37 words
An ultrasonic diagnostic probe as claimed in claim 6, further comprising means for successively energizing each of a plurality of subarrays of said transducers which partially overlap the transducers of adjacent subarrays to generate said acoustic beam.
Claim 14
Dependent Claim
32 words
An ultrasonic diagnostic probe as claimed in claim 7, wherein said opposite surface is convex as viewed in a longitudinal direction of said array to provide a focusing effect on said beam.
Claim 15
Dependent Claim
28 words
An ultrasonic diagnostic probe as claimed in claim 7, wherein said acoustic lens comprises a material having substantially the same acoustic impedance as that of said animate object.
Claim 16
Dependent Claim
60 words
An ultrasonic diagnostic probe as claimed in claim 8, further comprising a plurality of impedance matching elements each secured to each of said transducers and an impedance matching layer secured between said impedance matching elements and said concave surface of said lens, said impedance matching layer having a lower acoustic impedance than the acoustic impedance of said impedance matching elements.
References Cited (Backward Citations)
US2300251A
Cited
US2420676A
Cited
US3168659A
Cited
US3587561A
Cited
US3927662A
Cited
US3982223A
Cited
DE2345697A1
Cited
US3971962A
Cited
US3922907A
Cited
US3958559A
Cited
US4183249A
Cited
US4242912A
Cited
US4217516A
Cited
DE2718772A1
Cited
US4168482A
Cited
US4205686A
Cited
US4156863A
Cited
US4211948A
Cited
US4211949A
Cited
JPS5646390A
Cited
US4325381A
Cited
US4344327A
Cited
US4344327B1
Cited
US4340944A
Cited
US4297607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-03 | 1987-10-03 | 1988-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-03 | 1991-10-03 | 1992-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-03 | 1995-10-03 | 1996-04-03 | $7700.00 | Window Closed / Lapsed |