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    • 2. 发明申请
    • Electrostatic ultrasonic transducer drive control method, electrostatic ultrasonic transducer, ultrasonic speaker using the same, audio signal reproduction method, ultra-directional acoustic system, and display device
    • 静电超声波传感器驱动控制方法,静电超声波传感器,使用相同的超声波扬声器,音频信号再现方法,超定向声学系统和显示装置
    • US20070154036A1
    • 2007-07-05
    • US11566803
    • 2006-12-05
    • Kinya MATSUZAWA
    • Kinya MATSUZAWA
    • H04R3/00H04B3/00
    • H04R1/403H04R1/06H04R17/00H04R2201/401H04R2217/03H04R2430/20
    • A Push-Pull-type electrostatic ultrasonic transducer includes a first electrode having a through hole, a second electrode having a through hole making a pair with the through hole of the first electrode, and a vibration film held between a pair of electrodes composed of the first and the second electrodes and having a conductive layer to which a direct-current bias voltage is applied, and holds the pair of electrodes and the vibration film. Assuming that λ is the wavelength of the carrier wave having a frequency shifted as a predetermined amount of frequency from the resonance frequency, which is the mechanical resonance frequency of the vibration film, the thickness t of each of the pair of electrodes is set to (λ/4)·n or roughly (λ/4)·n (where, λ is the wavelength of the ultrasonic wave, n is a positive odd number), and an alternating-current signal, which is a modulated wave obtained by modulating the carrier wave in the ultrasonic frequency band with a signal wave in an audible frequency band, is applied between the pair of electrodes.
    • 推挽式静电超声波换能器包括具有通孔的第一电极,具有与第一电极的通孔成对的通孔的第二电极和保持在由一对电极组成的一对电极之间的振动膜 第一电极和第二电极,并具有施加直流偏置电压的导电层,并保持该对电极和振动膜。 假设λ是从作为振动膜的机械共振频率的共振频率偏移了预定频率频率的载波的波长,则一对电极中的每一个的厚度t被设定为( λ/ 4).n或粗略(λ/ 4).n(其中,λ是超声波的波长,n是正奇数)和交流信号,其是通过调制获得的调制波 在一对电极之间施加具有在可听频带中的信号波的超声波频带中的载波。
    • 5. 发明申请
    • ELECTROSTATIC ULTRASONIC TRANSDUCER, ULTRASONIC SPEAKER AND DISPLAY DEVICE
    • 静电超声波传感器,超声波扬声器和显示装置
    • US20070071261A1
    • 2007-03-29
    • US11535101
    • 2006-09-26
    • Kinya MATSUZAWA
    • Kinya MATSUZAWA
    • H04R25/00
    • H04R19/02H04R2217/03Y10T29/49226
    • An electrostatic ultrasonic transducer includes: a first electrode provided with a through hole; a second electrode provided with a through hole forming a pair with the through hole of the first electrode wherein an alternating current signal is applied between the first electrode and the second electrode; an oscillation film sandwiched between the pair of electrodes and having a conductive layer wherein a direct current bias voltage is applied to the conductive layer; and a holding member for holding the pair of electrodes and the oscillation film, wherein a value “a” of one side amplitude of the film oscillation is obtained by the following formula: a=(1/πf)√{(Io·10P/10)/2ρoc} wherein Io denotes the reference acoustic intensity, the reference acoustic intensity being 0.96×10−12 (W/m2), ρo is the density of the air, the density of the air being 1.2 (kg/m3) and c denotes the sound speed in the air, the sound speed in the air being around 340 (m/S), when it is assumed that the outputted desired sound pressure is P (dB), the driving frequency is f (Hz) and a value of one side amplitude of the film oscillation of the oscillation film, which is being driven, is “a” (m), and a height of a step part provided in an outer circumference of the through hole on the respective oscillation film sides of the pair of electrodes in a direction of the oscillation film side is set at a value exceeding and close to the one side amplitude value “a”.
    • 静电超声波换能器包括:具有通孔的第一电极; 第二电极,设置有与第一电极的通孔形成一对的通孔,其中在第一电极和第二电极之间施加交流信号; 夹在所述一对电极之间并具有导电层的振荡膜,其中直流偏置电压施加到所述导电层; 以及用于保持该对电极和振动膜的保持构件,其中通过以下公式获得膜振荡的一侧振幅的值“a”:<?in-line-formula description =“In-line Formulas “end =”lead“?> a =(1 / pif)√{(I 0 )/ 2 / c} <?in-line-formula description =“In-line Formulas”end =“tail”?>其中I 表示参考声强度,参考声强度为0.96×10 -6 -12(W / m 2),空气的密度是空气的密度为1.2(kg / m 2) 3),c表示空气中的声速,空气中的声速约为340(m / S),当输出的所需声压为P(dB)时,驱动频率 是f(Hz),被驱动的振动膜的膜振动的一个侧振幅的值为“a”(m),并且设置在该外周的台阶部的高度 在振荡膜侧的方向上的一对电极的各振荡膜侧的通孔被设定为超过并接近一侧振幅值“a”的值。