WO2016155321A1 - 压电受话器和超声波发生器复合结构 - Google Patents

压电受话器和超声波发生器复合结构 Download PDF

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Publication number
WO2016155321A1
WO2016155321A1 PCT/CN2015/094734 CN2015094734W WO2016155321A1 WO 2016155321 A1 WO2016155321 A1 WO 2016155321A1 CN 2015094734 W CN2015094734 W CN 2015094734W WO 2016155321 A1 WO2016155321 A1 WO 2016155321A1
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Prior art keywords
ultrasonic
piezoelectric
switching circuit
circuit
generator
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English (en)
French (fr)
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平慷
杨鑫峰
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Goertek Inc
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Goertek Inc
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Priority to US15/551,203 priority Critical patent/US20180031683A1/en
Priority to JP2017535047A priority patent/JP6535743B2/ja
Priority to EP15887275.4A priority patent/EP3247133B1/en
Publication of WO2016155321A1 publication Critical patent/WO2016155321A1/zh
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/521—Constructional features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • B06B1/0644—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88—Sonar systems specially adapted for specific applications
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/017—Gesture based interaction, e.g. based on a set of recognized hand gestures
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/043—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using propagating acoustic waves
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings
    • G10K9/22—Mountings; Casings
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/539—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section

Definitions

  • the present invention relates to the field of electronic technologies, and in particular, to a piezoelectric receiver and an ultrasonic generator composite structure.
  • the ultrasonic signal generator, the ultrasonic transducer and the ultrasonic receiving sensor need to be added to realize such a function, and the device is more, which undoubtedly increases the mobile phone.
  • the space and cost are also challenges to the trend of thin and light mobile phones.
  • the object of the present invention is to provide a composite structure of a piezoelectric receiver and an ultrasonic generator, and the technical solution adopted is as follows:
  • a composite structure of a piezoelectric receiver and an ultrasonic generator comprising: a piezoelectric sheet, an ultrasonic signal generator, an audio signal input circuit, and a switching circuit; an input end of the switching circuit and the ultrasonic signal generator and an audio signal, respectively An input circuit is coupled to switch between the two, the output of the switching circuit being coupled to the piezoelectric sheet.
  • a pattern recognition circuit for controlling the switching circuit is further included.
  • an ultrasonic receiving sensor is further included.
  • the outer casing further includes a boss, and the inner side of the outer casing is provided with a boss, and one end of the piezoelectric piece is bonded to the boss.
  • a weight is bonded to the other end of the piezoelectric sheet.
  • the weight is bonded to a side of the piezoelectric sheet adjacent to the outer casing.
  • the housing further includes a sensor slot, and the ultrasonic receiving sensor is disposed in the sensor slot, and the receiving side of the ultrasonic receiving sensor faces the outer side of the outer casing.
  • the outer casing is provided with an ultrasonic sounding passage.
  • the ultrasonic receiving sensors are two, and the ultrasonic sounding channel is disposed between the two ultrasonic receiving sensors.
  • the ultrasonic sounding channel is a honeycomb sounding hole.
  • the inventors of the present invention have found that there is no structure in which the piezoelectric receiver and the ultrasonic generator are combined in the prior art, and therefore the present invention is a new technical solution.
  • the technical effect of the present invention is that the piezoelectric receiver and the ultrasonic generator are combined, and only one piezoelectric piece can realize the functions of the receiver and the ultrasonic generator, thereby saving the cost and space of the electronic device.
  • Figure 1 is a circuit block diagram of an embodiment of a composite structure of a piezoelectric receiver and an ultrasonic generator of the present invention.
  • Figure 2 is a schematic exploded view of an embodiment of a composite structure of a piezoelectric receiver and an ultrasonic generator of the present invention.
  • 3-5 are schematic structural views of the back, front and side sides of the composite structure of the piezoelectric receiver and the ultrasonic generator of the present invention, respectively.
  • 6-8 are schematic structural views of a three-dimensional, a plan view and a side view of a honeycomb structure, respectively.
  • Fig. 9 is a schematic diagram showing the principle of gesture recognition using the piezoelectric receiver and ultrasonic generator composite structure of the present invention.
  • 1-pattern recognition circuit 2-switching circuit, 3-audio signal input circuit, 4-ultrasonic signal generator, 5-amplifier circuit, 6-piezoelectric sheet, 7-ultrasonic receiving sensor, 8-ultrasonic processor, 11- Double-sided tape, 12-double-sided tape, 13-flexible weight, 14-sensor groove, 15-slot, 16-ultrasonic sound channel, 17-cell structure, 171-sound hole 171.
  • the receiver is also called an earpiece. It is an electroacoustic device that converts an audio electrical signal into a sound signal without sound leakage. It is widely used in communication terminals such as mobile phones, fixed telephones and hearing aids to realize audio (call voice and music, etc.). Play.
  • the input circuit of the audio signal (including call voice and music, etc.) is connected to the piezoelectric piece through the power amplifier circuit, and the piezoelectric piece generates vibration due to the inverse piezoelectric effect, and the panel is passed through
  • the connected coupling structure transmits vibration to the mobile phone panel and then emits a sound, because the entire panel is vibrating and sounding, so there is no need to open a sound hole.
  • the piezoelectric sheet itself has excellent ultrasonic performance, it can work well in the frequency band of 20 Hz-20 kHz (the audible domain of the human ear) and the ultrasonic frequency band of 20 kHz or more, so the present invention is piezoelectrically received.
  • the combination of the receiver and the ultrasonic generator is realized by the excellent ultrasonic performance of the piezoelectric piece itself, and the dual functions of audio playback and gesture recognition are realized by using different working frequency bands.
  • the circuit connection can be referred to as shown in Fig. 1: the pattern recognition circuit 1 is used to identify the ultrasound mode and other modes (such as a call mode, a music play mode, etc.), and the mode recognition circuit 1 can be served by the mobile phone processor in the mobile phone.
  • the pattern recognition circuit 1 controls the switching circuit 2 to switch between the audio signal input circuit 3 and the ultrasonic signal generator 4 for emitting an electrical signal of the ultrasonic frequency band.
  • the switching circuit 2 is connected to the ultrasonic signal generator 4, and the ultrasonic signal generator 4 outputs an ultrasonic electric signal to the piezoelectric sheet 6 through the power amplifier circuit 5, and the piezoelectric sheet 6 generates vibration by the inverse piezoelectric effect.
  • the switching circuit 2 is connected to the audio signal input circuit 3.
  • an ultrasonic receiving sensor and an ultrasonic processor are further included, and the ultrasonic receiving sensor is configured to receive an echo of the ultrasonic wave, and perform an operation by the ultrasonic processor to implement gesture positioning.
  • the outer casing of the electronic device is composed of a panel, and a boss 15 and a piezoelectric piece are disposed at a position close to the edge of the back surface of one of the panels.
  • One end of 6 is bonded to the boss 15 by a double-sided tape 12, and the flexible weight 13 is bonded to the other end of the piezoelectric sheet 6 by the double-sided tape 11 and faces the panel, and the pressure can be adjusted by the flexible weight 13
  • the vibration characteristics and resonance frequency of the electric sheet 6, wherein the back side of the panel refers to the side of the panel facing the inside of the electronic device.
  • a sensor slot 14 is defined at each of the two sides of the piezoelectric sheet 6, and two ultrasonic receiving sensors 7 for receiving ultrasonic echoes are respectively disposed in the sensor slot 14, and the ultrasonic receiving sensor 7 receives The side faces the outside of the outer casing.
  • the panel is provided with an ultrasonic sounding passage 16 in the middle of the two sensor slots 14, and a honeycomb structure 17 is disposed in the sounding passage.
  • the specific structure of the honeycomb structure 17 can be seen in Figures 6-8. It can be seen that the sound holes 171 are radially arranged to facilitate ultrasonic scattering.
  • the size of the ultrasonic sounding passage 16 and the number, shape, arrangement of the sound emitting holes, and the position, number, and arrangement of the ultrasonic receiving sensors 7 can be further optimized according to the actual application environment.
  • the finger moves, the piezoelectric sheet 6 vibrates to emit ultrasonic waves, the ultrasonic receiving sensor 7 receives the echo, and the ultrasonic processor 8 calculates the time difference of the reflection to calculate the position of the finger. To achieve gesture recognition.
  • the composite structure works in the frequency band of 20Hz-20kHz, it can be used as a receiver.
  • the composite structure works in the ultrasonic frequency band above 20 kHz, it can be used as an ultrasonic generator.
  • the gesture recognition function can be realized by using the piezoelectric receiver and the ultrasonic generator composite structure of the present invention.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Remote Sensing (AREA)
  • Acoustics & Sound (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Human Computer Interaction (AREA)
  • Signal Processing (AREA)
  • Mechanical Engineering (AREA)
  • Multimedia (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Telephone Function (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

本发明公开了一种压电受话器和超声波发生器复合结构，包括：压电片、超声信号发生器、音频信号输入电路、以及切换电路；所述切换电路的输入端分别与所述超声信号发生器和音频信号输入电路连接以在两者之间进行切换，所述切换电路的输出端与所述压电片连接。本发明的技术效果在于，将压电受话器和超声波发生器结合在一起，只需要一个压电片就可以实现受话器和超声波发生器的功能，节省了成本和空间。

Description

压电受话器和超声波发生器复合结构 技术领域
本发明涉及电子技术领域，尤其涉及一种压电受话器和超声波发生器复合结构。
背景技术
移动互联时代，消费类电子信息产品越来越受关注，大量的智能设备出现在人们的日常生活中。在人机交互中，手势识别的应用使得大屏智能设备的操控变得更加方便。随着科学技术的发展和对基础材料研究的不断深入，智能设备上关于手势识别的传感器件也越来越多，利用压电陶瓷的超声回声定位原理实现悬空手势识别的技术也日臻发展。手机上传统的声学器件超声频带性能较差，无法满足超声传感器的要求，因此实现这样的功能至少需要增加超声信号发生器、超声换能器和超声波接收传感器，器件较多，这无疑增加了手机的空间和成本，也是对手机轻薄化趋势的挑战。
发明内容
本发明的目的是提供一种压电受话器和超声波发生器复合结构，采用的技术方案如下：
一种压电受话器和超声波发生器复合结构，包括：压电片、超声信号发生器、音频信号输入电路、以及切换电路；所述切换电路的输入端分别与所述超声信号发生器和音频信号输入电路连接以在两者之间进行切换，所述切换电路的输出端与所述压电片连接。
优选的，还包括控制切换电路的模式识别电路。
优选的，还包括超声波接收传感器。
优选的，还包括外壳，所述外壳的内侧设置有凸台，所述压电片的一端粘接在所述凸台上。
优选的，还包括粘接在所述压电片的另一端的配重块。
优选的，所述配重块粘接于所述压电片靠近所述外壳的一侧。
优选的，还包括外壳，所述外壳上设置有传感器槽，所述超声波接收传感器设置于所述传感器槽内，所述超声波接收传感器的接收侧朝向所述外壳的外侧。
优选的，所述外壳上设置有超声波出声通道。
优选的，所述超声波接收传感器为两个，所述超声波出声通道设置于两个超声波接收传感器之间。
优选的，所述超声波出声通道为蜂窝状的出声孔。
本发明的发明人发现，在现有技术中还没有将压电受话器和超声波发生器结合在一起的结构，因此本发明是一种新的技术方案。
本发明的技术效果在于，将压电受话器和超声波发生器结合在一起，只需要一个压电片就可以实现受话器和超声波发生器的功能，节省了电子设备的成本和空间。
通过以下参照附图对本发明的示例性实施例的详细描述，本发明的其它特征及其优点将会变得清楚。
附图说明
被结合在说明书中并构成说明书的一部分的附图示出了本发明的实施例，并且连同其说明一起用于解释本发明的原理。
图1是本发明压电受话器和超声波发生器复合结构实施例的电路框图。
图2是本发明压电受话器和超声波发生器复合结构实施例的爆炸示意图。
图3-5分别是本发明压电受话器和超声波发生器复合结构实施例的背面、正面、侧面的结构示意图。
图6-8分别是蜂窝结构的立体、俯视、侧视的结构示意图。
图9是利用本发明压电受话器和超声波发生器复合结构进行手势识别的原理示意图。
附图标记说明：
1-模式识别电路、2-切换电路、3-音频信号输入电路、4-超声信号发生器、5-功放电路、6-压电片、7-超声波接收传感器、8-超声处理器、11-双面胶、12-双面胶、13-柔性配重块、14-传感器槽、15-凸台、16-超声波出声通道、17-蜂窝结构、171-出声孔171。
具体实施方式
现在将参照附图来详细描述本发明的各种示例性实施例。应注意到：除非另外具体说明，否则在这些实施例中阐述的部件和步骤的相对布置、数字表达式和数值不限制本发明的范围。
以下对至少一个示例性实施例的描述实际上仅仅是说明性的，决不作为对本发明及其应用或使用的任何限制。
对于相关领域普通技术人员已知的技术、方法和设备可能不作详细讨论，但在适当情况下，技术、方法和设备应当被视为说明书的一部分。
在这里示出和讨论的所有例子中，任何具体值应被解释为仅仅是示例性的，而不是作为限制。因此，示例性实施例的其它例子可以具有不同的值。
应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步讨论。
受话器也叫听筒，是在无声音泄漏条件下将音频电信号转换成声音信号的电声器件，广泛用于移动电话、固定电话及助听器等通信终端设备中，实现音频(通话语音和音乐等)播放。以手机为例说明现有压电受话器的电路连接方式，音频信号(包括通话语音和音乐等)输入电路经过功放电路接入压电片，由于逆压电效应压电片产生振动，通过与面板连接的耦合结构将振动传递给手机面板继而发出声音，因为整个面板在振动发声所以不需要开设出声孔。
由于压电片本身具有优异的超声性能，可以很好的工作在20Hz-20kHz频段(人耳的可听域)和20kHz以上的超声频段，因此本发明以压电受话 器为基础，凭借压电片本身优异的超声性能实现受话器和超声波发生器的结合，利用其不同的工作频段实现音频播放和手势识别的双重功能，电路连接可以参考图1所示：模式识别电路1用于识别超声模式和其它模式(例如通话模式、音乐播放模式等)，在手机中模式识别电路1可以由手机处理器担任。模式识别电路1控制切换电路2在音频信号输入电路3和超声信号发生器4之间进行切换，超声信号发生器4用于发出超声频段的电信号。在超声模式下，切换电路2接入超声信号发生器4，超声信号发生器4输出超声电信号经过功放电路5接入压电片6，由于逆压电效应压电片6产生振动发出超声波。在其它模式下，切换电路2接入音频信号输入电路3。进一步的，还包括超声波接收传感器和超声处理器，超声波接收传感器用于接收超声波的回声，通过超声处理器进行运算实现手势定位。
参考图2-5介绍本发明压电受话器和超声波发生器复合结构的具体设置方式，电子设备的外壳由面板组成，在其中一块面板的背面的靠近边缘的位置设置有一凸台15，压电片6的一端通过双面胶12粘接在凸台15上，柔性配重块13通过双面胶11粘接于压电片6的另一端并且朝向该面板，利用柔性配重块13可以调节压电片6的振动特性和谐振频率，其中面板的背面是指面板朝向电子设备内部的一面。在该面板的正面，压电片6的两侧的位置处各开设有一个传感器槽14，两个用于接收超声波回声的超声波接收传感器7分别设置于传感器槽14内，超声波接收传感器7的接收侧朝向外壳的外侧。该面板在两个传感器槽14的中间设置有超声波出声通道16，该出声通道内设置有蜂窝结构17。蜂窝结构17的具体结构可以参考图6-8，可以看出出声孔171为放射状排布以利于超声波散射。
超声波出声通道16的尺寸和出声孔数量、形状、排列方式，以及超声波接收传感器7的位置、数量、排列方式可以根据实际应用环境进一步优化。
参考图9介绍本发明手势识别的原理，在超声手势识别模式下手指进行移动，压电片6振动发出超声波，超声波接收传感器7接收回波，超声处理器8计算反射的时间差来计算手指的位置以实现手势识别。
本发明压电受话器和超声波发生器复合结构的技术效果在于：
1.复合结构工作在20Hz-20kHz频段时，可以作为受话器使用。
2.复合结构工作在20kHz以上超声频段时，可以作为超声波发生器使用。
3.受话器和超声波发生器结合，节省手机空间和成本。
4.采用本发明的压电受话器和超声波发生器复合结构，可以实现手势识别功能。
虽然已经通过例子对本发明的一些特定实施例进行了详细说明，但是本领域的技术人员应该理解，以上例子仅是为了进行说明，而不是为了限制本发明的范围。本领域的技术人员应该理解，可在不脱离本发明的范围和精神的情况下，对以上实施例进行修改。本发明的范围由所附权利要求来限定。

Claims (10)

  1. 一种压电受话器和超声波发生器复合结构，其特征在于，包括：压电片、超声信号发生器、音频信号输入电路、以及切换电路；所述切换电路的输入端分别与所述超声信号发生器和音频信号输入电路连接以在两者之间进行切换，所述切换电路的输出端与所述压电片连接。
  2. 根据权利要求1所述的结构，其特征在于，还包括控制切换电路的模式识别电路。
  3. 根据权利要求1所述的结构，其特征在于，还包括超声波接收传感器。
  4. 根据权利要求3所述的结构，其特征在于，还包括外壳，所述外壳的内侧设置有凸台，所述压电片的一端粘接在所述凸台上。
  5. 根据权利要求4所述的结构，其特征在于，还包括粘接在所述压电片的另一端的配重块。
  6. 根据权利要求5所述的结构，其特征在于，所述配重块粘接于所述压电片靠近所述外壳的一侧。
  7. 根据权利要求3所述的结构，其特征在于，还包括外壳，所述外壳上设置有传感器槽，所述超声波接收传感器设置于所述传感器槽内，所述超声波接收传感器的接收侧朝向所述外壳的外侧。
  8. 根据权利要求7所述的结构，其特征在于，所述外壳上设置有超声波出声通道。
  9. 根据权利要求8所述的结构，其特征在于，所述超声波接收传感器为两个，所述超声波出声通道设置于两个超声波接收传感器之间。
  10. 根据权利要求8所述的结构，其特征在于，所述超声波出声通道为蜂窝状的出声孔。
PCT/CN2015/094734 2015-03-31 2015-11-16 压电受话器和超声波发生器复合结构 Ceased WO2016155321A1 (zh)

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