KR200459177Y1 - A dynamic Microphone unit system with plural air reflection chamber adopted wool blankets filter - Google Patents

A dynamic Microphone unit system with plural air reflection chamber adopted wool blankets filter Download PDF

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Publication number
KR200459177Y1
KR200459177Y1 KR2020100010027U KR20100010027U KR200459177Y1 KR 200459177 Y1 KR200459177 Y1 KR 200459177Y1 KR 2020100010027 U KR2020100010027 U KR 2020100010027U KR 20100010027 U KR20100010027 U KR 20100010027U KR 200459177 Y1 KR200459177 Y1 KR 200459177Y1
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KR
South Korea
Prior art keywords
filter
microphone unit
echo
dynamic microphone
diaphragm
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KR2020100010027U
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Korean (ko)
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장동우
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장동우
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/021—Casings; Cabinets ; Supports therefor; Mountings therein incorporating only one transducer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2838—Enclosures comprising vibrating or resonating arrangements of the bandpass type
    • H04R1/2846—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/08—Microphones

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

.

Description

{A dynamic Microphone unit system with plural air reflection chamber adopted wool blankets filter}

The present invention uses a single layer of compressed wool to form a filter, a filter and the space therebetween, consisting of one independent reverberation chamber and one or several independent individual reverberation chambers having a certain proportion of air volume. Or it relates to a dynamic microphone unit of the structure having a plurality of stacked reverberation chamber by combining in a plurality of layers, more specifically, to form a vibration system with a diaphragm and a moving coil, consisting of a magnetic field system consisting of a magnet and a yoke and a plate, There are six upper and lower vent holes penetrating up and down inside the body of the microphone unit, and 12 square recessed protrusions are formed on the left and right sides of the microphone unit, and six rectangular side filter insert holes and the outside and side of the body of the unit are formed. Formed through the filter insertion hole A dynamic microphone unit consisting of six rectangular side vents and six circular side vents, an air conditioning system that controls air volume by consisting of sound absorbing material and an echo space on the inner side and the bottom of the unit body, and a moving coil on the upper part of the dynamic microphone unit. In the space between the dome bottom of the fixed diaphragm and the upper surface of the magnet, a single, separate, independent echo chamber made of a material of compressed wool is provided with a space within the limit that the diaphragm does not come into contact with it. In the lower part of the dynamic microphone unit, a plurality of independent individual reverberation chambers are stacked and installed in the lower part of the reverberation space installed for the purpose of resonance, thereby suppressing the occurrence of diffuse reflection and vortex caused by the air vibration generated when the diaphragm is driven. Diaphragm Stable A dynamic microphone unit having a stacked echo chamber composed of a compressed wool material that filters the waveform and frequency response sensitivity of each individual sine wave frequency by inducing vibration. will be.

In general, a dynamic microphone converting vibration energy due to sound pressure into electrical energy has a magnetic field circuit composed of a magnet, a yoke, and a plate, and a diaphragm and a moving coil responsible for vibration. The dynamic microphone unit has a vibration system including a moving coil, a side air conditioner for balancing the atmospheric pressure on the inner side, and a reverberation space that adjusts the remaining sound space by applying sound absorbing materials to the lower surface. Equipped.

1 is a cross-sectional view showing a structure of a conventional dynamic microphone unit. When the diaphragm 101 vibrates up and down by sound pressure (arrow), the moving coil 104 is located on the bottom surface of the dome 99 of the diaphragm 101. ) Will also exercise up and down at the same time.

Then, the N polarity formed at the upper portion of the magnetized magnet 108 and the S polarity formed at the lower portion form the S polarity at the portion of the plate 105 via the yoke 107. The magnetic field MF1 (Magnetic Field) is formed in the space between the plates 105. As the moving coil 104 moves up and down in a magnetic field, Electro Magnetic Induction occurs according to Faraday's law. That is, induced electromotive force is generated at both ends of the moving coil 104. Will be. At this time, the induced electromotive force is closer to the original sound as the shape of the waveform is closer to the sine wave (Sine Wave).

In the conventional dynamic microphone unit as described above, the induced electromotive force, i.e., the volume generated from the moving coil 104, is measured between the Gaussian magnetic flux density of the magnet 108, the N pole of the magnet 108, and the S pole of the plate 106. It is determined according to the interval, the winding number of the moving coil 104, the thickness of the winding conductor, the change in the resistance value, and the like. In addition, the frequency response (Frequecy Response) is the shape and the shape of the diaphragm stamped on the diaphragm 101 in order to smooth the flow of the diaphragm 101, the material angle, the hemispherical dome 99, the bending angle, the sound pressure 101) and the molding temperature.

In addition, the most important sound quality and tone of the characteristics of the dynamic microphone are the inflow and discharge amounts of the air of A1 introduced into the unit through the first filter 102 to the dynamic microphone unit as shown in FIG. 1. Adjusting the amount of inflow and discharge of air applied from the space A2 to the A6 through the second filter 106 and the echo space 111 through the third filter 110 via the portion A3 and the space A3 from the space A2. By adjusting the inflow and discharge amount of the air A5 in the role of the air cushion in the inside, the buffering action by the residual air amount (A5) in the echo space 111 located between the third filter 110 and the coupling rubber 112, etc. It is mostly determined by driving the diaphragm 101 without distortion.

All existing dynamic microphone units have a diaphragm when the diaphragm is driven by applied sound pressure or vibration of the diaphragm. There is only an original return force due to the elasticity of the diaphragm property itself at atmospheric pressure. ,

That is, in the dynamic microphone unit, the waveform of the normal phase is derived from the sound wave or the vibration of sound, but in the case of the anti-phase, the waveform is derived from the original return force due to the elasticity of the diaphragm property itself. have.

Accordingly, in the structural composition of the dynamic microphone unit, an echo space is provided to serve to correct the normal driving of the diaphragm by adjusting the amount of air.

The echo space in the conventional dynamic microphone unit has a structure surrounded by one rubber or injection material, and is generated when the diaphragm and moving coil are driven up and down the center horizontal line of the magnetic field MF1 formed between the plate and the magnet. When the flow of air is introduced into the reverberation space of the rubber or injection (ABS) material at the bottom of the unit and is discharged, the air flow is rapidly reflected and diffusely reflected or repulsed by the hard surface of the rubber or injection material. Due to this, it does not play a role as an air cushion and is rapidly discharged, increasing the reflection, diffuse reflection or repulsive pressure on the bottom of the diaphragm, thereby preventing the diaphragm from normal smooth driving and causing abnormal vibration of the diaphragm. Negative in normal frequency reproduction due to induction of electromotive force Therefore, the conventional dynamic microphone unit shows universal characteristics in frequency response and sensitivity, but the sound quality and sound clearness are distorted compared to the original sound. There is a problem that can only generate sound.

The purpose of the present invention is to adjust the air volume by applying the sound absorbing material and the echo space to the inner side and the lower side of the diaphragm and moving coil and the inner side and the lower side of the unit that constitute the vibration system in the main magnet and yoke and plate magnetic field circuits that constitute the basic magnetic field circuit. In the dynamic microphone unit consisting of an air conditioning system, the vibration of the air generated by the vibration of the diaphragm flows in and out of the up and down is applied to the diaphragm without distortion, leading to smooth and accurate frequency characteristics and correcting the close to the original sound The present invention relates to a dynamic microphone unit having a structure in which a compressed wool material that enables the best sound quality is configured as a filter and a stacked echo chamber is installed.

In order to achieve this object, a dynamic microphone unit having a plurality of stacked echo chambers using a compressed wool material according to the present invention as a filter is provided in the reflection space A5 of the lower part of the third filter located at the lower part of the unit. The fourth filter is installed on the bottom to form the first echo chamber, and the air volume A7 of the space under the fourth filter is 50% of the air volume of A5, and the bottom of the bottom space A7 of the fourth filter The fifth filter is installed and used as the second echo chamber, and the air volume A8 of the space under the fifth filter is 50% of the air volume of A7. A filter is installed and used as a third reverberation chamber. The air volume A9 of the space under the sixth filter is 50% of the air volume of A8, and the bottom of the lower space of A9 and the surface of the rubber or the injection molded product. The seventh filter is provided in the.

That is, the present invention installs a first echo chamber having an air volume of 1/2 of the echo space in the lower part of the echo space, and a second echo chamber having an air volume of 1/4 of the echo space in the lower part of the echo space; The third reverberation chamber having an air volume of 1/8 of the reverberation space is installed at the lower part thereof, and the fourth or fifth, sixth, seventh, It is characterized by being installed to the eighth, ninth, tenth echo chamber.

More specifically, the first echo chamber 50, the second echo chamber 25, the third echo 12.5, the fourth echo chamber 6.25, the fifth echo chamber 3.125, the sixth echo chamber 1.5625, based on the pupil of the echo space with a numerical value of 100. The seventh echo chamber 0.78125, the eighth echo chamber 0.390625, the ninth echo chamber 0.1953125, and the tenth echo chamber 0.09765625, where the sum of the numerical values of the echo chambers from 1 to 10 and the numerical value of the echo space correspond to the ratio of 1: 1. When it is most effective.

However, due to space constraints and the thickness of the filter material, it is efficient to install the first, second, third, fourth, and fifth echo chambers in the manufacturing process.

In the dynamic microphone unit, the closer the number of stacked echo chambers is to 10, the better the correction effect.

In addition, the present invention is characterized in that each filter between the reverberation chamber uses a thickness of 0.1 mm to 3 mm within the wool wool (Wool Blanket) material.

The present invention is applied to all dynamic microphone units used in microphones to correct the waveform of each individual frequency generated when the diaphragm of the dynamic microphone unit is driven by sinusoidal wave and increase the frequency response to improve howling and hum. Minimize, and make the best sound quality without changing the basic design value as it is.

The present invention relates to a dynamic microphone unit consisting of a magnetic field system, a vibration system and an air conditioner. In this case, the magnetic field system is composed of a main magnet, a plate and a yoke of the dynamic microphone unit, and the vibration system is generally composed of a diaphragm and a moving coil, and the air conditioner includes six upper and lower aeration holes penetrating up and down inside the dynamic microphone unit. 12 square recessed projections formed for mounting the auxiliary magnet on the inside, and 6 rectangular side vents and 6 circular side vents formed through the inside of the unit and 6 rectangular side filter insert holes inside the unit It consists of a lower filter and an echo space.

A feature of the present invention is the addition of a plurality of echo chambers at the bottom of the reverberation space at the bottom of the lower filter at the bottom of the inside of the dynamic microphone unit of the upper and lower vents and the side vents and the projections of the air conditioning system. It is installed at the diaphragm and compensates for unstable air pressure flow in the echo space.

In order to achieve the above object, a dynamic microphone unit having a plurality of stacked echo chambers surrounded by compressed wool according to the present invention has a bottom surface of a lower space A5 (111) of a third filter 110 located below the unit. The fourth filter 117 is installed in the first echo chamber, and the air volume A7 114 in the space under the fourth filter 117 is 50% of the air volume of the A5 111. The flow of air introduced and discharged from the echo space is corrected, and the fifth filter 121 is installed on the bottom of the lower space A7 114 of the fourth filter 117 to be used as the second echo chamber. The air volume A8 115 in the space below the filter 121 is 50% of the air volume of the A7 114 to correct the flow of air introduced and discharged from the second echo chamber. By installing the sixth filter 118, the seventh filter 120, Used as a fourth echo chamber.

In addition, the diaphragm 101 is within the limit allowed by the space in the cavity A3 between the bottom of the dome 99 located in the center of the diaphragm 101 located above the dynamic microphone unit and the top surface of the magnet 108. ) Is driven to the maximum and the independent reflection chamber composed of the eighth filter 122, the ninth filter 123, the space A 10 (124) within a distance that does not come into contact with the bottom surface of the dome 99 when vibrating up and down. The air distribution formula above is installed to stabilize the friction, reflection and diffuse reflection between the air flow applied from the diaphragm 101 and the upper surface of the magnet 108 and ultimately correct the normal driving of the diaphragm 101. do.

Compressed wool material according to the present invention is composed of a filter structured dynamic microphone unit having a stacked echo chamber can be implemented as any dynamic microphone.

2 is a preferred embodiment of the present invention.

2 is a cross-sectional view showing the structure of the dynamic microphone unit according to the present invention. When the diaphragm 101 vibrates up and down by sound pressure, the bottom surface of the dome 99 located in the center of the diaphragm 101 is shown. The moving coil 104 located also moves up and down at the same time.

When the negative pressure is applied to the diaphragm 101 through the unit lid vent 103 of the unit lid 100 via the first filter 102, the diaphragm 101 based on the horizontal line of the diaphragm 101 ) Is driven to the top and bottom, and also the moving coil 104 attached to the bottom of the diaphragm 101 to drive the induced electromotive force in the magnetic field (MF1).

And in the characteristic of the dynamic microphone unit according to the present invention for the most important sound quality and tone, the air of A1 introduced into the unit via the first filter 102 when sound pressure is applied to the upper surface of the unit body 119. The flow rate of the air flow of A2 generated by the flow rate of the diaphragm 101 is discharged into the space of A6 via the second filter 106 and the rectangular and circular vent holes 113 on the side of the unit. After the air flow amount of A3 and A2 is introduced into the echo space 111 through the yoke vent 109 and the third filter 110, the diaphragm 101 is withdrawn from the negative pressure or vibration pressure, and thus the diaphragm ( When the unstable air A5 in the reverberation space 111 is to be returned to the original position 101, the fourth filter 117 absorbs the flow of the reflection pressure or repulsion pressure which is to be directly discharged to the bottom surface of the diaphragm 101. The lower space A7 114 serves as an air cushion to control the flow of distorted air.

The volume of air in the space A7 114 retains 50% of the volume of air in the echo space 111 A5 and compensates for the flow of air directly in and out of the echo space 111 A5. The fifth filter 121 is installed at the bottom of the lower space A7 114 of the filter 117 to absorb the distorted pressure or flow that is not corrected at the A7 114, and the lower space A8 115 is further removed. It acts as another air cushion to control the flow of distorted air to a pressure or flow that was not corrected at A7 114.

The volume of air volume of space A8 115 holds 50% of the air volume of A7 114 and is responsible for secondary correction.

In addition, the sixth filter 118 is installed on the bottom surface of the lower space A8 115 of the fifth filter 121 to absorb the distorted pressure or flow not corrected by the A8 115 and the lower space A9 116. This serves as another air cushion to further control the flow of distorted air or pressure that was not corrected at A8 115.

In addition, the seventh filter 120 is installed on the surface where the bottom surface of the space A9 116 and the rubber 112 contact with each other to stabilize contact, friction, and reflection with the surface of the rubber 112, and are applied from the echo chambers. Further correction of the corrected airflow ultimately corrects the normal drive of the diaphragm 101.

The eighth filter 122 according to the above formula is also provided in the space A3 between the upper surface of the magnet 108 and the bottom surface of the dome 99 located in the center of the diaphragm 101 and the inner surface of the attached moving coil 104. And a ninth filter 123 and a space A 10 124 may be corrected.

The correction effect is best when the number of stacked echo chambers is set up to 10 in the dynamic microphone unit.

Hereinafter, the effects on the dynamic microphone unit of the present invention will be described.

7 is a graph comparing overall frequency response characteristics of the dynamic microphone unit of the present invention and a conventional dynamic microphone unit. The apparatus for measuring the output characteristics of the dynamic microphone unit includes an audio sweep generator (SWG 103, Japan kokuyo), an audio tracer (FCR 113, Japan kokuyo), a recorder (WX 400, Japan leader), A speaker (EV 2502, USA Electrovoice) was used. The measurement results were obtained by amplifying the output of 1W with an amplifier at a distance of 1M from the speaker in the anechoic chamber composed of the above-described measuring instruments and sweeping the audio signal at 10 second intervals.

As a result of the experiment, as shown in FIG. 7, the overall frequency response characteristic of the microphone unit of the present invention marked with a red line is higher than the overall frequency response characteristic line of a conventional microphone unit marked with a blue line. It can be seen that the area of the frequency range (Frequency Range) is increased.

That is, it can be seen that the microphone unit of the present invention provides superior sound quality than the conventional microphone unit.

FIG. 8 is a photograph showing output characteristics of a sine wave at a frequency measured at 1 KHz for a microphone equipped with a dynamic microphone unit of the present invention and a microphone equipped with a conventional microphone unit. FIG.

The apparatus used to measure the output characteristics includes an audio sweep generator (SWG 103, Japan kokuyo), a speaker (EV 2502, USA Electro voice), an oscillator (Tektronix 2465B, USA), and a flop (Strack IP). 005, Japan).

As shown in FIG. 8, the dynamic type unit A of the present invention forms accurate and smooth waveforms of waveforms formed on the sinusoidal peak point curve portion of the upper end marked on the oscilloscope. However, in the conventional unit B, the curved portions of the valleys and the ridges of the sine wave are distorted and boosted above the limit line so as to protrude upward from the circular curve waveform of the sine wave, and the waveform of the peak point. It can be seen that tremors are large at the site. When the diaphragm is withdrawn from the negative or vibration pressure and the diaphragm is about to return to normal, the diaphragm operates smoothly under the influence of the reflected pressure or the repulsive pressure, which is directly discharged to the bottom of the diaphragm. It can be seen that the conventional unit B does not realize accurate original sound and reproduces the distorted sound due to the occurrence of secondary tremor due to interference.

On the other hand, Figure 9 is a graph showing a comparison of the characteristics of the sensitivity of the floor and the valley of the frequency waveform output when the instantaneous signal (Trigger) of frequency 1Khz for each of the microphone unit and the conventional microphone unit according to the present invention .

In FIG. 9, equipment used to measure output characteristics of each unit includes an audio sweep generator (SWG 103, Japan Kokuyo), an audio tracer (FCR 113, Japan Kokuyo), a recorder (Recorder, WX). 4000, Japan Leader), speaker (Speaker, EV 2502, USA, Electro voice).

The measurement was made 1 m from the speaker in the anechoic chamber, and the microphone unit of the present invention and the conventional microphone unit were installed. The speaker outputs a signal amplified by 1W frequency of 1W, applies a trigger signal for 0.1 seconds to each of the two units, and then outputs a signal of the frequency sensitivity and sine waveform output from each unit. The difference between and goals was recorded. After 1 second, the signal was continuously applied to both units, and the continuous frequency sensitivity at 1 Khz for each unit was recorded.

Here, the red line (A) is a characteristic graph generated when a 0.1 second instantaneous signal is applied to a conventional unit at a frequency of 1 kHz, and the blue line (B) is a 0.1 second instantaneous signal applied to a unit of the present invention at a frequency of 1 kHz. This is a characteristic graph generated when the blue and red lines (C) on the right is a characteristic graph generated when a continuous signal of 1 kHz is applied to each of the two units.

As a result of the test, in the case of the conventional microphone unit, as shown by the red line (A) of FIG. 9, the output in response to the input signal when the instantaneous signal is received is the output in response to the continuous signal, that is, the right line (C). You can see that it is distorted than the level of) and boosted to the upper side.

That is, in the conventional microphone unit, when the diaphragm receives the instantaneous signal, the diaphragm withdraws the negative pressure or vibration pressure, and when the diaphragm tries to return to its original state, the air in the space of the echo chamber is directly discharged to the bottom part of the diaphragm. Alternatively, it can be seen that the phenomenon of distortion of the sine wave and the valley part of the sinusoidal wave appears due to the occurrence of the secondary shaking phenomenon by disturbing the normal smooth driving of the diaphragm under the influence of the repulsive pressure.

That is, it can be seen that the distorted sound is reproduced without the accurate original sound.

However, even if the instantaneous signal is input, the microphone unit of the present invention only derives an output value for the value in response to the absolute value of the input signal. Accordingly, as shown in FIG. 9, it can be seen that the blue line B maintains the same level as the line C on the right side and there is no change.

That is, the dynamic microphone unit of the structured structure having an echo chamber laminated with a compressed wool material of the present invention as a filter can reproduce accurate original sound.

The present invention compensates the waveform of each individual frequency generated when the diaphragms of all dynamic microphone units used in the dynamic microphone are driven by sine wave and improves the frequency response characteristic to minimize howling and hum, There is an effect that can realize the best sound quality by using the original characteristics without changing the design value.

Compressed wool material according to the present invention composed of a filter having a stacked echo chamber structured dynamic microphone unit can be applied to all dynamic microphones.

1 is a cross-sectional view showing the structure of a conventional dynamic microphone unit.

2 is a cross-sectional view of a structural scheme having stacked echo chambers of a dynamic microphone unit according to an embodiment of the present invention;

3 is a cross-sectional view of a structural scheme having an echo chamber of a dynamic microphone unit according to an embodiment of the present invention;

Figure 4 is a perspective view of the dynamic microphone unit of the present invention assembled.

Figure 5 is a perspective view of the unit body of the dynamic microphone unit of the present invention.

Figure 6 is a perspective view of the unit body of the dynamic microphone unit of the present invention after being assembled.

7 is a graph comparing total frequency response characteristics (Frequency Response Graph) for the microphone unit of the present invention and the conventional microphone unit.

Blue line: The overall frequency response line for a conventional microphone unit.

Red line: The overall frequency response line for the microphone unit of the present invention.

FIG. 8 is a photograph of a sine wave waveform having an individual frequency of 1 Khz obtained from the microphone unit of the present invention and a conventional microphone unit.

A: A sinusoidal waveform of individual frequency 1 Khz obtained from the microphone unit of the present invention.

B: A sinusoidal waveform of 1 Khz individual frequency obtained from a conventional microphone unit.

FIG. 9 is a graph comparing characteristics of a response sensitivity output when a trigger signal having a frequency of 1 kHz is applied to the microphone unit of the present invention and a conventional microphone unit.

Description of the Related Art

99: dome

100: microphone unit upper cap

101: diaphragm 102: first filter

104: moving coil

105: plate 107: yoke.

108: magnet 110: third filter 111: echo space.

113: rectangular side vent 119: unit body

117,118,120,121: filter 122,123,124: echo chamber.

125: up and down through air vent 126: rectangular depression projection

127: side filter insert hole 128: circular side vent hole

Claims (3)

Vibration system consists of diaphragm and moving coil, and magnetic field system consists of magnet, yoke and plate, and there are 6 vertical ventilation holes penetrating up and down inside the body of dynamic microphone unit, and 12 square recessed protrusions on the left and right positions And six rectangular side vents and six circular side vents formed through six rectangular structure side filter insertion holes formed between the upper and lower vent holes and between the outer side surface of the unit body and the side filter insertion holes. A dynamic microphone unit comprising an air conditioner configured to adjust the air volume by a sound absorbing filter and an echo space on the inner side and the bottom of the unit body, the bottom of the dome located in the center of the diaphragm and the inner side of the moving coil attached thereto. Between the upper surface of the magnet Dynamic microphone unit of the structure consists of compressed wool material, characterized in that used to install a separate echo chamber of each in the lower part of the copper and the echo area as a filter having a stacked echo chamber The dynamic microphone unit according to claim 1, wherein the compressed wool material is formed of a filter and laminated with echo chambers, which are installed by using one to ten echo chambers. The method of claim 1, wherein the body of the echo chamber comprises a wool wool (Wool Blanket) material as a filter and the thickness of the filter is composed of a compressed wool material, characterized in that using a filter within 0.1 mm to 3 mm Dynamic microphone unit of the structure having a stacked echo chamber.
KR2020100010027U 2010-09-29 2010-09-29 A dynamic Microphone unit system with plural air reflection chamber adopted wool blankets filter KR200459177Y1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6110396A (en) 1984-06-26 1986-01-17 Matsushita Electric Ind Co Ltd Dynamic microphone
JPH11275680A (en) 1998-03-24 1999-10-08 Sony Corp Acoustoelectric converter
KR20080007924A (en) * 2006-07-19 2008-01-23 장동우 The method of surface grinding for diaphragm material
KR20090095161A (en) * 2008-03-05 2009-09-09 장동우 A dynamic type unit system with sound collect Sphere and sound collect Ring

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6110396A (en) 1984-06-26 1986-01-17 Matsushita Electric Ind Co Ltd Dynamic microphone
JPH11275680A (en) 1998-03-24 1999-10-08 Sony Corp Acoustoelectric converter
KR20080007924A (en) * 2006-07-19 2008-01-23 장동우 The method of surface grinding for diaphragm material
KR20090095161A (en) * 2008-03-05 2009-09-09 장동우 A dynamic type unit system with sound collect Sphere and sound collect Ring

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