Manufacturing method of ultrasonic transducer

Abstract

The invention provides a manufacturing method of an ultrasonic transducer so as to achieve the purpose, which is characterized by comprising the following steps: (1) cutting piezoelectric ceramics into array elements, and bending the piezoelectric ceramics into a concave shape; (2)respectively bonding two circuit boards on the right side and the reverse side of an aluminium block, and aligning one end of a circuit board circular arc to a central circular arc line of the concave of the piezoelectric ceramics, with both centers of circles superposed and both curvature radii differing by about 5 mm; (3) welding one end of an electrode wire on a welding pad at one end of the circuit board circular arc, and welding the other end of the electrode wire on a welding spot of an array element signal electrode surface of the piezoelectric ceramics; and (4) filling the concave space of the piezoelectric ceramics and the welded part of the electrode wire with an elastic polymer material mixture by a casting method, namely carrying out backing casting. The manufacturing method can greatly improve the fastness and the reliability of the welding spot and the shock resistance of the transducer, and has a very obvious effect on resisting expansion caused by heat and contraction caused by cold.

Description

technical field [0001] The invention relates to a manufacturing method of an ultrasonic transducer. Background technique [0002] Ultrasonic transducer is a device that can convert electrical signals into ultrasonic waves, and can convert ultrasonic reflection signals received from the human body or other detected objects into electrical signals. It is widely used in the field of medical ultrasonic diagnosis and field of ultrasonic nondestructive testing. Usually the structure of the ultrasonic transducer is as figure 1 As shown, it includes a piezoelectric ceramic 1', an acoustic matching layer 2', a backing 6', an acoustic lens 11' and a circuit board 15' with connectors. [0003] Commonly used array ultrasonic transducers include linear array and convex arc array. In the manufacturing process of array ultrasonic transducers, how to connect the electrodes of dozens or even hundreds of array elements of piezoelectric ceramics to the circuit board is the key One of the pr...

AI Technical Summary

Problems solved by technology

This method can be used in the manufacture of convex arc array and micro-convex array transducers, but the firmness and reliability of the solder joints are poor, and the solder joints are located on the edge, resulting in poor impact resistance and easy damage

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