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Control of piezoelectric transducer array

A piezoelectric transducer and transducer technology, applied in piezoelectric/electrostrictive transducers, electrostatic transducer speakers, instruments, etc., can solve the influence of interference patterns, reduce the overall efficiency of equipment, transducers Differences in features, etc.

Pending Publication Date: 2022-03-01
NEDERLANDSE ORG VOOR TOEGEPAST NATUURWETENSCHAPPELIJK ONDERZOEK TNO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, variations in transducer characteristics may occur due to manufacturing tolerances, stress in the membrane, deformation, prolonged use, and / or temperature changes across the array, which may reduce the overall efficiency of the device
For example, when the phase difference between sound waves is not well controlled, the interference pattern can be affected and the efficiency of the device can also be affected

Method used

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  • Control of piezoelectric transducer array
  • Control of piezoelectric transducer array
  • Control of piezoelectric transducer array

Examples

Experimental program
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Embodiment Construction

[0015] The terminology used to describe particular embodiments is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. The term "and / or" includes any and all combinations of one or more of the associated listed items. It should be understood that the terms "comprising" and / or "comprising" specify the presence of stated features, but do not exclude the presence or addition of one or more other features. It will be further understood that when a specific step of a method is defined as being followed by another step, unless otherwise specified, the specific step may be performed directly after the other step, or may be performed after the specific step is performed. One or more intermediate steps are performed before. Also, it should be understood that when a connection between structures or components is described, that connection may...

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PUM

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Abstract

A method and system for controlling an array of piezoelectric transducers (11, 12, 13). A respective drive signal (Vn) is applied to the transducer. The drive signal (Vn) comprises an alternating component (A) that oscillates at one or more drive frequencies to induce a corresponding vibration in the transducer for generating the acoustic wave (Wn). The one or more drive signals (Vn) are biased by respective bias voltages (Bn). The bias voltage (Bn) is controlled to reduce the difference in resonant frequencies between the transducers. In order to eliminate any remaining difference, the alternating component (A) for at least a subset of the transducers (11, 12) is periodically reset to synchronize the phase of the resulting acoustic waves (W1, W2).

Description

technical field [0001] The present disclosure relates to piezoelectric transducers, and more particularly to methods and systems for controlling transducer arrays. Background technique [0002] Acoustic devices can be used in a variety of applications, such as acoustic imaging, measurement, audio, actuation, haptic feedback, and more. When placed in an array, multiple acoustic transducers can be configured to work in a coordinated manner to generate a combined acoustic wave profile. For example, the phases of the individual waves can be configured to produce constructive interference at a certain point in mid-air for purposes such as haptic feedback / control or 3D audio. Acoustic transducers generally include a vibrating membrane to generate corresponding sound waves. For example, the vibrating membrane can be induced to vibrate by applying an alternating current driving signal (Alternating Current, AC voltage) to the piezoelectric material. However, variations in transduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R19/02H04R7/16
CPCH04R19/02H04R7/16H04R2400/11G10K11/346B06B1/0207B06B1/0607G06F3/016H04R1/403H04R3/12H04R17/00
Inventor 希尔克·布勒·阿克曼保罗·路易斯·玛莉亚·约瑟夫·万妮尔阿尔诺·威廉·弗雷德里克·佛尔克
Owner NEDERLANDSE ORG VOOR TOEGEPAST NATUURWETENSCHAPPELIJK ONDERZOEK TNO