Acoustics – Sound-modifying means – Lens
Patent
1993-02-09
1994-11-15
Gellner, Michael L.
Acoustics
Sound-modifying means
Lens
367103, 367150, G10K 1100, G01S 1500
Patent
active
053650247
ABSTRACT:
The acoustic lens system is used for ultrasonic imaging in an ultrasonic system which displays an image of an object while transmitting ultrasonic waves and receiving the ultrasonic waves reflected from the object, and has a half field angle .omega. expressed as follows: ##EQU1## wherein the reference symbol v.sub.0 represents the velocity of sound in the medium located on the incidence side of the first lens surface and the reference symbol v.sub.1 designates the velocity of sound in the medium located on the emergence side of the first lens surface. Accordingly, the acoustic lens system according to the present invention is remarkably excellent in the performance thereof in respect of field angles, aberrations, aperture angles, attenuation, etc., and has an advantage to permits further reducing acoustic attenuation and preventing spurious images from being formed due to multiple reflections by arranging antireflection films on the lens surfaces.
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Beaver, et al., "Ultrasonic Imaging with an Acoustic Lens", IEEE Transactions on Ultrasonics, vol. SU-24, No. 4, Jul. 1977, pp. 235-243.
Hasegawa Akira
Ikuta Eishi
Imade Shinichi
Omura Masayoshi
Gellner Michael L.
Noh Jae N.
Olympus Optical Co,. Ltd.
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