The utility model content
The purpose of this utility model is to provide a kind of microphone, is intended to solve the bigger problem of a plurality of microphone occupation space in the microphone array system.
Another purpose of the present utility model is to provide a kind of microphone, and described microphone comprises diaphragm, and described microphone also includes two backplanes, is respectively arranged with pad between described diaphragm and described two backplanes.
Another purpose of the present utility model is to provide a kind of microphone array system, described microphone array system comprises at least one microphone, described microphone comprises diaphragm, and described microphone also includes two backplanes, is respectively arranged with pad between described diaphragm and described two backplanes.
The microphone that the utility model embodiment provides includes two backplanes, be respectively arranged with pad between the diaphragm of microphone and two backplanes, on the basis of a microphone, adopt the structure of corresponding two backplanes of a vibrating diaphragm, form two interelectrode capacitances, needing to have realized two dual signal output effects that traditional microphones just can obtain.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The microphone that the utility model embodiment provides includes two backplanes, is respectively arranged with pad between the diaphragm of microphone and two backplanes, on the basis of a microphone, adopts the structure of corresponding two backplanes of a vibrating diaphragm, forms two interelectrode capacitances.
Fig. 1 shows the structure of the microphone that the utility model embodiment provides, and Fig. 2 is the vertical view of the microphone that provides of the utility model, below in conjunction with Fig. 1 and Fig. 2 the utility model is elaborated.
Wherein, this microphone comprises diaphragm 5; Zona 4; Pad 12,13; Backplane 8,11 etc.
In specific implementation process, diaphragm 5 connects earth polars by zona 4, and diaphragm 5 is as two interelectrode capacitance one ends, experiences acoustic pressure and vibrates, and causes the variation of interelectrode capacitance, realizes the conversion of acoustic-electric; Thereby pad 12,13 forms electric capacity at interval with diaphragm 5 and backplane 8,11, backplane 8,11 is as each end of two interelectrode capacitances, and the small electrical signals that the capacitance variations of gained causes conducted to corresponding effect transistor (FieldEffect Transistor, FET) 1 gate input, FET plays the effect of impedance conversion and gain amplification, and the backplane of the utility model embodiment is a disjunctor copper ring backplane.
See also Fig. 2: A, B are two signal output parts, and C is an earth terminal.
In specific implementation process, zona 4, diaphragm 5, backplane 11 and pad 13 form the converting system of a cover acoustic-electric, after the extraneous sound source work, sound enters from sound hole, under the acoustic pressure effect, cause diaphragm 5 vibrations, the acoustic pressure size causes the variation of diaphragm 5 Oscillation Amplitude sizes, and the sound frequency difference causes diaphragm 5 vibration frequency change, and diaphragm 5 is done harmonic vibration, cause the variation of the electric capacity spacing d between the pad 13, root is according to C=ε S/d, and capacitance changes thereupon, again according to C=Q/U, Q is the quantity of electric charge of electret on vibrating membrane, remain unchanged, capacitor C changes and causes a signal of telecommunication U, and resulting signal U is transmitted to the grid of a FET by disjunctor copper ring backplane 11, after the impedance conversion of FET, obtain to utilize signal, and draw from solder joint A shown in Figure 2.
Equally, zona 4, diaphragm 5, backplane 8 and pad 12 also form the converting system of a cover acoustic-electric, after the extraneous sound source work, sound enters from sound hole, under the acoustic pressure effect, cause the vibration of diaphragm 5, diaphragm 5 is done harmonic vibration, cause the variation of the electric capacity spacing d between the pad 12, root is according to C=ε S/d, and capacitance changes thereupon, again according to C=Q/U, Q is the quantity of electric charge of electret on vibrating membrane, remain unchanged, capacitor C changes and causes a signal of telecommunication U ', and resulting signal U ' is transmitted to the grid of a FET by disjunctor copper ring backplane 11, after the impedance conversion of FET, obtain to utilize signal, and draw from welding point B shown in Figure 2.
More than two the cover acoustic-electrics converting system shared zona 4, diaphragm 5, also promptly in the converting system of two cover acoustic-electrics the vibration source of two signals identical, the Oscillation Amplitude in any moment is identical, under the condition that other material parameter is set, cause that two interelectrode capacitance variable quantities are identical, but variation tendency is opposite, so phase place is opposite.And except that phase place, other temporal properties of two signals are identical, so frequency response curve and amplitude time graph are identical, and this has just reached the requirement of signal stack coupling.
The microphone that the utility model embodiment provides includes two backplanes, be respectively arranged with pad between the diaphragm of microphone and two backplanes, on the basis of a microphone, adopt the structure of corresponding two backplanes of a vibrating diaphragm, form two interelectrode capacitances, needing to have realized two dual signal output effects that traditional microphones just can obtain.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.