ACOUSTIC LENS, ULTRASONIC PROBE AND ULTRASONIC DIAGNOSTIC APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide an acoustic lens having a variable focal length. SOLUTION: The acoustic lens comprises an acoustic lens body 500 made of a rubber-like elastic material formed in a cylindrical shape, a pair of cavities 502 parallel to each other and symmetrical with respect to a lens axis 510 and provided at an inside of a curved surface of the body 500, and liquid 504 filled in the cavities to regulate their amounts to thereby change a curvature of the curved part of the body 500.