PZT transducer and manufacturing method thereof

Abstract

The invention relates to a PZT transducer and a manufacturing method thereof. The PZT transducer comprises: a piezoelectric ceramic substrate and an electrode unit. The piezoelectric ceramic substrate has a first surface and a second surface, wherein the first surface is opposite to the second surface; and the mechanical quality factor (Qm) of the piezoelectric ceramic substrate is larger than 1400. And the electrode unit has a first electrode and a second electrode; the first electrode is arranged on the first surface and has a first diameter; the second electrode covers on the second surface and is extended to cover a portion of surfaces of the periphery of the first surface as well as the portion of the second electrode has a second diameter, wherein the portion of the second electrode covers the second surface; and a ratio of the first diameter to the second diameter is 0.498 to 0.502. Therefore, according to the invention, the PZT transducer has advantages of great atomization amount and long service life.

Description

technical field [0001] The invention relates to a piezoelectric ceramic sheet device and a manufacturing method thereof, and in particular to a piezoelectric ceramic sheet oscillator and a manufacturing method thereof. Background technique [0002] In the known technology, the piezoelectric ceramic vibrator (PZT Transducer) can be used in the mist humidifier, which can generate ultrasonic waves in the water, push out a water column, and eject the Rayleigh wave of the surface acoustic wave from the interface between the water column and the air ( Rayleigh wave) droplets, and the air is blown into the air by the fan to transport the droplets to the surrounding environment, and the droplets float in the air to increase the humidity of the environment. The droplet size is related to the ultrasonic frequency, the higher the frequency, the smaller the droplet, and the smaller the atomization amount under the same droplet delivery device. [0003] Some known mist humidifiers spray...

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Problems solved by technology

[0005] In recent years, the demand for thin, small and portable mist humidifiers has been increasing day by day, and the device with small electric energy spray has gradually become a development trend. In the design, a piezoelectric ceramic plate is used to generate vibration and squeeze the liquid to produce mist droplets through a metal plate with small holes. Most of the demands are for the design of the mist humidifier structure, but there are few literature and patent discussions on how to make a piezoelectric ceramic vibrator with a large spray volume and a long service life.

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