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Array micro audio directional transducer

A transducer and micro-acoustic technology, applied in the field of MEMS-based transducers and ultrasound, can solve problems such as poor directivity, low receiving sensitivity, and low output power

Inactive Publication Date: 2009-11-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the output power of a single transducer unit is small, the directivity is poor, and the receiving sensitivity is low. Therefore, the present invention uses a transducer array to improve the directivity of the transducer, enhance the transmission distance, increase the output sound pressure level, and increase the output power etc.

Method used

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Embodiment Construction

[0035] figure 1 Shown is an embodiment of the circular array unit in the present invention, as follows figure 1 As shown, the array unit consists of four parts, the upper electrode 1 , the lower electrode 3 , the ultrasonic radiation material 2 and the base 4 . The upper electrode 1 and the lower electrode 3 fix the radiation material 2 and serve as positive and negative electrodes of the array unit. The upper electrode 1 and the lower electrode 3 are formed by sputtering. This process ensures the stability of the conduction on both sides of the film and the small parasitic resistance. The vibration radiation material 2 is a piezoelectric film material. The piezoelectric film material can be a piezoelectric ceramic film material or a piezoelectric polymer film material. The radiation material 2 requires high mechanical response and electrical response sensitivity. Impedance is required to match air impedance as closely as possible. When a voltage is applied to the electrode...

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Abstract

The invention provides an array micro audio directional transducer, belonging to the technical field of ultrasound, in particular to the technical field of transducer. The transducer comprises the following working steps: a plurality of micro transducer units are arranged on a support frame evenly or unevenly for transmitting ultrasound modulated by audible signals; the ultrasound is self modulation in air to generate audible sound with high directivity. The transducer unit consists of four parts, namely, a top electrode, a bottom electrode, radiating materials and a base. The surface of the support frame is coated with plus-minus electrodes to connect with all plus-minus electrodes of the transducer units. The number of the array micro audio directional transducer units can be changed according to the requirements of directivity, sound pressure level and other parameters. The transducer features high conversation efficiency in electro mechanics, strong directivity, good stability, changeable array structure and the like.

Description

technical field [0001] The utility model relates to an array type miniature audio frequency directional transducer, which belongs to the field of ultrasonic technology, and in particular relates to the technical field of transducers based on MEMS. Specifically, the present invention relates to an ultrasonic transducer that directly generates ultrasonic waves, and generates audible sounds with high directivity through the nonlinear interaction of the ultrasonic waves in the air. Background technique [0002] A transducer is a device that converts electrical signals into acoustic signals. Traditional transducers radiate sound waves in the audible frequency range directly into the air, making it difficult to achieve high directivity. The array-type miniature audio frequency directional transducer produces highly directional audible sound through the nonlinear interaction of ultrasonic waves in the air, independent of the inherent characteristics of the transducer. Its main wo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R1/40H04R17/00
Inventor 徐利梅李学生王祎许亮锋耿云龙
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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