Piezoelectric low-energy-consumption broadband warning device for automobile

Abstract

The invention relates to a piezoelectric low-energy-consumption broadband warning device for an automobile. The piezoelectric low-energy-consumption broadband warning device comprises a shell, wherein an opening is formed on the upper end face of the shell, and a sound transmission hole is formed in the lower end face of the shell; an installation cavity is formed in the shell; a vibration base plate is fixedly arranged in the installation cavity of the shell; a composite piezoelectric sheet is arranged on the upper end face of the vibration base plate, and a vibration thin film is arranged on the lower end face of the vibration base plate; the vibration base plate and the composite piezoelectric sheet form a vibration base source; the vibration thin film and the vibration base plate form a sound transmission source; a circuit board is arranged in the opening of the upper end face of the shell; a flexible circuit board is arranged in the installation cavity of the shell; the circuit board is electrically connected with the flexible circuit board; and the flexible circuit board is electrically connected with the composite piezoelectric sheet. The piezoelectric low-energy-consumption broadband warning device for the automobile has the advantages that the composite piezoelectric sheet serves as the vibration base source, a spring steel material of which the thickness is 0.15 mm to 0.25 mm is hollowed out and serves as the vibration base plate, the molded composite piezoelectric sheet is attached to the vibration base plate, and a layer of polyester vibration thin film is attached to the lower part of the vibration base plate to form the vibration base source, so resonant frequency can reach 800 Hz, high frequency reaches 20,000 Hz, and the performance of a product is improved.

Description

technical field [0001] The invention relates to the technical field of automobile warning devices, in particular to a piezoelectric low-energy broadband warning device for automobiles. Background technique [0002] At present, my country's traditional car warning devices are divided into three types: piezoelectric buzzer, electromagnetic buzzer, and dynamic speaker. With the advancement of science and technology, people's requirements for sound quality are getting higher and higher. The traditional piezoelectric buzzer and electromagnetic buzzer are gradually replaced by coil speakers due to their shortcomings such as narrow frequency band and poor sound quality. However, with the country's control of rare earths, the cost of rare earths is getting higher and higher, and NdFeB magnets are indispensable components in moving coil speakers. As the cost of rare earths increases, the price of NdFeB magnets will also increase. As a rising tide lifts all boats, the cost of dynamic...

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Problems solved by technology

[0003] The traditional ceramic thin-film piezoelectric sheet requires at least 1100 degrees of high temperature to form, while the composite piezoelectric sheet contains silver. When the temperature is higher than 950 degrees, the silver will evaporate and disappear. The traditional solution is to add palladium paste to the silver paste Composition, the ratio is: 70% silver + 30% palladium, although it can reach the temperature required for the formation of ceramic thin film piezoelectric sheet, but the price of palladium is very expensive, which increases a lot of production costs

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