초록 ▼

An ultrasonic transducer and a method for manufacture thereof in which a piezoelectric crystal is bonded to a flat diaphragm with the neutral bending axis of the crystal/diaphragm combination being within the bonding agent. The diaphragm is then pressed into the open end of a hollow shell. The reson

An ultrasonic transducer and a method for manufacture thereof in which a piezoelectric crystal is bonded to a flat diaphragm with the neutral bending axis of the crystal/diaphragm combination being within the bonding agent. The diaphragm is then pressed into the open end of a hollow shell. The resonant frequency of the shell, diaphragm and crystal combination is determined by the extent to which the diaphragm is pressed into the shell and, in the preferred example disclosed, is set at about 19.8 KHz. The shell cavity is then filled with a mixture of RTV and a nonconductive particulate material at a weight ratio between 5/1 and 20/1. This mixture lowers the Q of the transducer while also raising its resonant frequency to the desired 20 KHz.

대표청구항 ▼

The method of constructing an ultrasonic transducer having a shell open at least at one end and a vibratory element having an element periphery and including a piezoelectric crystal, said method comprising the steps of locating said vibratory element over an open end of said shell coaxially therewit

The method of constructing an ultrasonic transducer having a shell open at least at one end and a vibratory element having an element periphery and including a piezoelectric crystal, said method comprising the steps of locating said vibratory element over an open end of said shell coaxially therewith such that said vibratory element is mechanically coupled to said shell, and adjusting resonant frequency of said element and shell by varying the mechanical coupling between said vibratory element and said shell around the periphery of said element until the resonant frequency of the combined element and shell is equal to a preselected frequency.