Communications – electrical: acoustic wave systems and devices – Acoustic image conversion
Patent
1991-11-22
1993-08-10
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Acoustic image conversion
367150, 73642, 12866301, G03B 4206
Patent
active
052355535
ABSTRACT:
A preferred embodiment of a large diameter solid ultrasonic imaging transducer is illustrated in FIG. 5 with alternate embodiments illustrated in FIGS. 6-9. The large diameter solid ultrasonic imaging lens 100 has a diameter preferably greater than six inches with a focal length-to-diameter ratio of between 1 and 2. The lens 100 has concave surfaces 108 and 110, and is composed of a homogenous material that has an ultrasonic impedance of less than twice that of water and has a density less than the water. Preferably, the velocity of the ultrasonic sound through homogenous plastic material is less than twice that of water. One or both of the concave surfaces 108 and 110 have surfaces that are without a constant radius and curvature, but however are composed of separate radius of curvatures for each small increment of lens surface to properly focus the ultrasound at a desired focal length "L".
An alternate embodiment is illustrated in FIG. 6 which has two exterior solid rigid lens elements that are of a concaval-convex nature forming a liquid lens 126 therebetween that has a double convex arrangement for accurately focusing the ultrasound rays to the desired focal length. Preferably, the solid lens surfaces are coated with a one-quarter wave length reflection reduction layer for reducing even further any ultrasonic reflection or energy loss.
REFERENCES:
patent: Re32062 (1986-01-01), Samodovitz
patent: 3687219 (1972-08-01), Langlois
patent: 3802533 (1974-04-01), Brenden
patent: 3898608 (1975-08-01), Jones et al.
Garlick George F.
Neeley Victor I.
Advanced Imaging Systems
Pihulic Daniel T.
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