KR100987854B1 - A dynamic type unit with attach the assistant plate for multiple magnetic field system - Google Patents

Abstract

The present invention relates to a composite magnetic field dynamic type unit having multiple auxiliary plates using several auxiliary plates. More specifically, the present invention relates to a composite magnetic field having Korean Patent No. 10-0799862-00-00 registered on January 17, 2008. As an improved invention of the dynamic unit (PCT registration WO / 2008/010679), the basic magnetic circuit is composed of the main magnet, main plate and yoke, such as a microphone or a speaker, and is composed of a vibration circuit with a diaphragm and a moving coil. In the unit, in order to install a separate auxiliary magnet around the basic magnetic field formed by the main magnet and the moving coil and to maximize the efficiency of the magnetic force of the auxiliary magnet, the magnet (Fe) on the surface of the magnet By attaching the structure, it is assisted by the property that maintains maximum magnetic force. Composite magnetic field dynamics with multiple auxiliary plates that attach rates to the front and back of the auxiliary magnets to correct the waveform of each distorted individual frequency generated by the microphone or speaker, resulting in the best sound quality close to the original. It is about a unit.

Dynamic Units, Magnetic Fields, Auxiliary Magnets, Auxiliary Plates, Speakers, Microphones

Description

A dynamic type unit with attach the assistant plate for multiple magnetic field system}

The present invention relates to a dynamic unit having a complex magnetic field, and more specifically, to a dynamic unit having a diaphragm, a magnet, and a moving coil, such as a microphone or a speaker, in the vicinity of a basic magnetic field formed by the magnet. Auxiliary magnets, which form auxiliary magnetic fields, are installed, and auxiliary plates are attached to the front and rear of the auxiliary magnet to maximize the efficiency of the magnetic force of the auxiliary magnet so that the waveform of each distorted individual frequency generated from the microphone or speaker is generated. The present invention relates to a complex magnetic field dynamic unit with multiple auxiliary plates that can be calibrated to achieve the best sound quality close to the original sound.

In general, a microphone for converting vibration energy by sound pressure into electrical energy, or a speaker for converting electrical energy into vibration energy, has a magnet and a vibrometer. It comprises diaphragms and moving coils, which are referred to collectively as 'dynamic type units'.

1 is a cross-sectional view illustrating a structure of a conventional microphone. When the diaphragm 103 vibrates up and down by sound pressure (arrow), the moving coil 111 located on the bottom of the diaphragm 103 also moves up and down simultaneously. Then, the N polarity and the S polarity formed at the upper portion of the magnetized magnet 108 form an S polarity at the portion of the plate 106 via the yoke 107, and the magnet 108 A magnetic field MF 1 is formed in the space between the plates 106. As the moving coil 111 moves up and down in the magnetic field MF 1, electromagnetic induction occurs according to Faraday's law. That is, induced electromotive force is generated at both ends of the moving coil 111. 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).

The sound color reproduced by the microphone as shown in FIG. 1 includes adjustment of the amount of air through the first filter 101, adjustment of the amount of air discharge in the space A2 through the second filter 105, and third filter 112. It is determined by adjusting the air discharge amount of the space A3 through, vortex formation of the remaining air in the echo air tank (115). In FIG. 1, reference numeral 100 is an upper lid, 104 is an upper vent, 110 is a housing, 113 is a side vent, 109 is a lower vent, and 114 is a rubber holder.

2 is a cross-sectional view illustrating a structure of a conventional speaker. When an electrical signal is applied to the moving coil 111 between the plate 106, the main magnet 108, and the pole 117, the moving coil 111 is applied. ) Vibrates the diaphragm 103 while moving up and down, and reproduces the sound source while pressing or discharging the air volume between the spaces A1, A2 and A3 by the vibration of the diaphragm 103.

2 is important to control the vibration of the diaphragm 103 by the spider 119 and the air volume of the spaces A2 and A3 by the side vents 113. In FIG. 2, reference numeral 116 denotes a pole plate, and 118 denotes a bobbin.

In the conventional dynamic unit as described above, the induced electromotive force, i.e., the volume generated from the moving coil 111, 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 number of windings of the moving coil 111, the thickness of the winding conductor, the change in the resistance value, and the like. In addition, the frequency response (Frequecy Response) is largely determined by the shape of the pattern stamped on the diaphragm 103 to smoothly flow the thickness and material of the diaphragm 103, the sound pressure.

As described above, in the conventional dynamic unit, the moving coil forms a basic magnetic field MF 1 between the plate and the magnet. Therefore, when the driving range of the moving coil is out of the maximum dense part of the magnetic field MF1, Induced electromotive force is not generated smoothly, the moving coil itself generates a natural vibration has a negative effect on the reproduction of the normal sine wave (Sine Wave).

Therefore, the conventional microphones and speakers show universal characteristics in frequency response and sensitivity, but sound quality and sound clearness are distorted and accurate reproduction of the original sound. There was an impossible problem.

On the other hand, Korean Patent Publication No. 2000-40796 (published date; 2000.07.05) introduces a speaker device having a double magnet with an auxiliary magnet installed on the inner circumference of the magnet. In some cases, an auxiliary magnet is attached to the surface. The conventional speaker unit has a structure in which the auxiliary magnet is in direct contact with poles and pole plates, which are components constituting the basic magnetic circuit, to further supply the magnetic force of the auxiliary magnet to the basic magnetic circuit. Achieve. Therefore, there is an effect that can improve the gain (sensitivity), and to realize the small and light weight of the speaker, but the effect of correcting the waveform of each distorted individual frequency, or to achieve the best sound quality at all It is not.

In addition, Japanese Patent Application Laid-open No. Hei 17-354571 (published date: December 22, 2005) relates to a dynamic microphone unit, in which an auxiliary magnetic field having the same polarity as that of the upper polarity of the main magnet is disposed on the upper part of the basic magnetic circuit. The structure which forms (Anti Magnetic Field) is introduced. The microphone unit aims to improve sensitivity by reducing magnetic leakage, but in the structure facing the same polarity, the improvement of sensitivity is almost expected because the magnetic force of the main magnet decreases due to the repulsion of the opposite magnetic field. Can not.

An object of the present invention is a dynamic unit comprising a main magnet constituting a basic magnetic field circuit and a diaphragm and moving coil constituting a vibrometer in the magnetic field circuit, wherein each individual frequency waveform generated by vibration of the diaphragm is generated. It provides a complex magnetic field dynamic unit with multiple auxiliary plates that compensates for accurate sinusoidal distortion without distortion, resulting in the best sound quality close to the original without changing the basic design value.

In order to achieve the above object, the composite magnetic field dynamic type unit having multiple auxiliary plates according to the present invention is provided with at least one auxiliary magnet so as to be spaced apart from the main magnet in at least one of the upper, lower or side surfaces of the main magnet. The total magnetic flux density of the auxiliary magnet is 25 to 100% of the main magnet magnetic flux density, and an auxiliary plate having an area equal to that of the auxiliary magnet is placed on a surface of the auxiliary magnet opposite to the main magnet. Attached to the front and rear of the auxiliary magnet, the thickness of the auxiliary plate is characterized in that 25% -100% of the thickness of the main plate.

In the present invention, the magnetic flux density of the upper auxiliary magnet and the side auxiliary magnet is 25% of the magnetic flux density retained by the main magnet, respectively, and the area of the front auxiliary plate of the upper auxiliary magnet and the front auxiliary plate of the side auxiliary magnet is the respective auxiliary magnet. The thickness of the front subplates is the same as the area of the surface facing the magnet, and the thickness of the front subplates also serves as a path for magnetic force according to the distribution ratio of 25% of the magnetic flux density retained by the upper and side auxiliary magnets compared to the main magnets. The area of the rear auxiliary plate of the upper auxiliary magnet and the rear auxiliary plate of the side auxiliary magnet is equal to the area of the side where each auxiliary magnet faces the main magnet, and the thickness is 25% of the thickness of the upper auxiliary magnet and the lower auxiliary. Like the contrast of the magnet 1: 2 Depending on the ratio, the thickness of the rear auxiliary plates is 50% of the thickness of the main plate, which serves as a passage for magnetic force.The magnetic flux density of the lower auxiliary magnet is 50% of the magnetic flux density of the main magnet and the area of the lower front auxiliary plate is The lower auxiliary magnet is the same as the area of the surface facing the main magnet and the thickness is 50% of the thickness of the main plate in the same manner as the above distribution ratio, and the area of the lower rear auxiliary plate is the lower auxiliary magnet It is characterized in that it is equal to the area of the surface facing the magnet and the thickness is 100% of the thickness of the main plate in the same manner as the above distribution ratio.

In addition, the present invention is characterized in that the separation distance of the main magnet and the auxiliary magnet to which the auxiliary plates are attached is within a thickness of the main magnet at 0.1 mm.

Dynamic type unit having a complex magnetic field having an auxiliary plate according to a preferred embodiment of the present invention is installed on the upper, lower and side of the main magnet to be spaced apart from the main magnet, respectively, the upper auxiliary magnet and the side auxiliary magnet The magnetic flux density value of is 25% of the magnetic flux density value of the main magnet, and the magnetic flux density value of the lower auxiliary magnet is 50% of the magnetic flux density value of the main magnet.

The most preferred embodiment of the present invention is based on the proportional auxiliary magnets spaced apart in the up, down, left and right directions with respect to the main magnet on the basis of the installation of the magnet in order to maximize the efficiency of the magnetic force retained by each of the auxiliary magnets Among the characteristics, the iron (Fe) structure is attached to the surface of the magnet to maintain the maximum magnetic force, and the front and rear of the upper auxiliary magnet facing the main magnet, the front and rear of the side auxiliary magnet and the front of the lower auxiliary magnet Attach the auxiliary plate on the back.

The diameter of the auxiliary plates has a diameter equal to the diameter of each of the auxiliary magnets facing the main magnets, and the thickness of the auxiliary plates is 25-100% of the thickness of the main plate, which is a basic component of the magnetic field circuit. .

The present invention is applied to a dynamic unit, such as a speaker or a microphone, to correct the waveform of each individual frequency generated when the diaphragm is driven with an accurate sine wave to minimize howling and hum and to reduce the basic design value. There is an effect that can realize the best sound quality by utilizing the characteristics of the original sound without change.

The present invention relates to a dynamic unit consisting of a basic magnetic field circuit and a vibrometer, such as a microphone or a speaker. In this case, the basic magnetic field circuit is composed of a main magnet, a plate, and a yoke in the case of a microphone, and a main magnet, a pole, and a pole plate in the case of a speaker. In addition, the vibrometer usually consists of a diaphragm and a moving coil.

A feature of the present invention is to install an auxiliary magnet having an auxiliary plate attached to a front side and a rear side of the main magnet so as to be spaced apart from the main magnet in at least one of upper, lower, or side surfaces of the main magnet. In this case, the auxiliary magnet may be installed only at any one of the upper, lower, or side surfaces of the main magnet, or may be installed at two or more of these. In particular, the side auxiliary magnets may be installed on the left and right sides of the main magnet, or may be installed so as to surround the main magnet from all directions, such as left and right, front and rear. It is preferable to install both the upper auxiliary magnet, the lower auxiliary magnet and the side auxiliary magnet to which the auxiliary plate of each front and rear is attached. In the present invention, when only one auxiliary magnet is installed, the auxiliary plate is attached to the front and rear surfaces. It is most effective to install the lower auxiliary magnet.

In the present invention, the magnetic flux density of the auxiliary magnet is characterized in that the total amount is 25 to 100% of the magnetic flux density of the main magnet. At this time, the magnetic flux density of the upper auxiliary magnet and the side auxiliary magnet is 25% of the magnetic flux density held by the main magnet, respectively, and the area of the upper front auxiliary plate of the upper auxiliary magnet and the side front auxiliary plate of the side auxiliary magnet is It is equal to the area of the surface facing the main magnet, and the thickness is 25% of the thickness of the main plate, and the area of the upper rear auxiliary plate and the side rear auxiliary plate of the side auxiliary magnet is that each auxiliary magnet faces the main magnet. It is equal to the surface area and the thickness is 50% of the thickness of the main plate. In addition, the magnetic flux density of the lower auxiliary magnet is 50% of the magnetic flux density of the main magnet, and the area of the lower front auxiliary plate of the lower auxiliary magnet is equal to the area of the surface where the lower auxiliary magnet faces the main magnet, and the thickness is the thickness of the main plate. The area of the lower rear auxiliary plate of the lower auxiliary magnet is preferably equal to the area of the surface where the lower auxiliary magnet faces the main magnet, and the thickness is preferably 100% of the thickness of the main plate. If all the upper, lower, and side auxiliary magnets are installed, the total magnetic flux density of the auxiliary magnet is the same as the main magnet.

If the magnetic flux density values of the upper, lower and side auxiliary magnets differ from the suggested proportional values of the upper (25%) side (25%) and lower (50%) or the arrangement order is changed or the upper, lower and side auxiliary magnets The thickness of the auxiliary plates attached to the upper plate is proportional to the thickness of the main plate. Upper Front (25%) Side Front (25%) Upper Rear (50%) Side Rear (50%) Lower Front (50%) Lower Rear (100 When%) is changed, the magnetic density of the magnetic field density part changes during the formation of the composite magnetic field, which causes problems in the equilibrium and stability of the main magnet and the magnetic field formation, thereby halving the effect of the composite magnetic field. In the present invention, different types of magnets having different materials may be used as the auxiliary magnets, but in this case, the magnetic flux density of each auxiliary magnet may be distributed at the same ratio as described above.

In addition, in the present invention, the separation distance between the main magnet and the auxiliary magnet to which the auxiliary plates are attached is preferably within 0.1 mm to the same distance as the thickness of the main magnet. The auxiliary plate and the auxiliary magnet are in close contact for increasing the efficiency of the magnetic force. It is preferable.

In the present invention, the separation guide may be installed between the main magnet and the auxiliary magnet, the separation distance may be less than 0.1mm depending on the performance of the separation guide. In other words, the lower limit of the separation distance 0.1mm. Represents the minimum distance that the main magnet and the auxiliary magnet do not contact each other, the number itself is not technically critical. On the other hand, if the separation distance between the main magnet and the auxiliary magnet is larger than the thickness of the main magnet, the dense magnetic field of the portion of the cross magnetic field is reduced to reduce the effect of the complex magnetic field. This can be seen from the magnetic tape showing the density of the magnetic field. In the present invention, even if the separation distance between the main magnet and the auxiliary magnet within the distance of the sum of the thickness of the main magnet and the yoke and the plate constituting the basic magnetic circuit, some effects appear. In addition, the diameter of the auxiliary magnet and the auxiliary plate is preferably equal to or smaller than the diameter of the main magnet.

The dynamic type unit according to the present invention may be implemented as one of a microphone, a speaker, a headphone, an earphone, and a buzzer.

FIG. 3 shows the structure of a composite magnetic field microphone having an auxiliary plate as a preferred embodiment of the present invention. The main magnet 11 and the yoke 12 and the main plate 13 constitute a basic magnetic circuit, and the moving coil 14 and the diaphragm 15 constitute a vibrometer. Electromotive force is generated by the vertical movement of the moving coil 14 driven by the diaphragm 15 with respect to the basic magnetic field MF1 formed between the main plate 13 showing the S pole and the N pole pole of the main magnet 11. do. This electromotive force is negatively reproduced by an amplification means (not shown). Reference numeral 10 is a housing, 16 is the first filter, 17 is the lid, 18 is the upper vent hole, 19 is the second filter, 20 is the third filter, 22 is the side vent hole, 23 is the lower vent hole, 26 is It is a rubber holder

A feature of the present invention is that the upper auxiliary magnet 21, the upper front auxiliary plate 32, and the upper rear auxiliary plate 36 are installed at the upper center portion of the first filter 16. The upper auxiliary magnet 21 has a magnetic flux density value corresponding to 25% of the total magnetic flux density value of the main magnet 11, and a distance from the main magnet 11 is separated from the upper surface of the main magnet 11 by the main magnet ( It is preferable to install them so as to be spaced apart within the thickness of 11), but the thickness of the main magnet 11, the yoke 12, and the main plate 13 constituting the basic magnetic circuit may be within the combined distance. The area of the auxiliary plate 32 is equal to the area of the surface where the upper auxiliary magnet 21 faces the main magnet 11, and the thickness is 25% of the thickness of the main plate 13, and the upper rear auxiliary plate ( The area of 36) is equal to the area of the surface where the upper auxiliary magnet 21 faces the main magnet 11, and the thickness thereof is 50% of the thickness of the main plate 13.

In addition, the outer side of the lid 17 is provided with a side auxiliary magnet 27, side front auxiliary plate 33 and side rear auxiliary plate 37. This side auxiliary magnet 27 has a magnetic flux density value corresponding to 25% of the total magnetic flux density total value of the main magnet 11, and the distance from the main magnet 11 is equal to that of the main magnet 11 from the outer surface of the main magnet 11. It is preferable to install so as to be spaced apart by a distance within the thickness of 11) and the area of the side front auxiliary plate 33 is equal to the area of the side where the side auxiliary magnet 27 faces the main magnet 11 and the thickness is the main plate. The area of the side rear auxiliary plate 37 is equal to the area of the side where the side auxiliary magnet 27 faces the main magnet 11 and the thickness of the main plate 13 It is made into 50% of the thickness which it has.

In addition, in the third filter 20 which controls the air volume of the echo air tank 25, the lower auxiliary magnet 24, the lower front auxiliary plate 34, and the lower rear surface are spaced apart from the yoke 12 at a predetermined interval. The auxiliary plate 35 is installed. The lower auxiliary magnet 24 has a magnetic flux density value corresponding to 50% of the total magnetic flux density total value of the main magnet 11, and a distance from the main magnet 11 is separated from the lower surface of the yoke 12 by the main magnet 11. It is preferable to install so as to be spaced apart by a distance within the thickness of the lower front auxiliary plate 34 and the area of the lower auxiliary magnet 24 is equal to the area of the surface facing the main magnet and the thickness is 50 of the thickness of the main plate The area of the lower rear auxiliary plate 35 is equal to the area of the surface where the lower auxiliary magnet 24 faces the main magnet, and the thickness is 100% of the thickness of the main plate.

In the present invention, the separation distance of the auxiliary magnet (21, 24, 27) is 0.1mm or more within the thickness of the main magnet 11, the sum of the magnetic flux density of the auxiliary magnet (21, 24, 27) is the main magnet It is equal to the magnetic flux density of (11), the auxiliary magnets (21, 24, 27) are the same as the diameter of each of the auxiliary magnets (21, 24, 27) on the surface of the portion facing the main magnet (11) The auxiliary magnets (21, 24) are used in close contact with the front auxiliary plates (32.33.34) and the rear auxiliary plates (35, 36, 37) in proportion to the thickness of the main plate (13), which is a component of the basic magnetic field circuit. , 27) can maximize the efficiency of the magnetic flux density can achieve a more stable performance.

In the microphone unit in which the auxiliary magnets 21, 24, and 27 are installed according to the present invention, as shown, the upper auxiliary magnet 21 is positioned on the upper part of the lid 17 and the upper filter 16, which serve as a separating guide. The magnetic pole MF2 is formed between the N pole of the main magnet 11 through the upper front auxiliary plate 32 which serves to maximize the efficiency of the S pole of the upper auxiliary magnet 21, and the upper auxiliary magnet. A magnetic field MF3 is formed between the north pole of the 21 and the south pole of the main plate 13 through the upper rear auxiliary plate 36, and the lower filter (in which the lower auxiliary magnet 24 takes the place of the separation guide) Between the yoke 12 through the lower front auxiliary plate 34 of the lower auxiliary magnet 24 and the lower pole of the auxiliary magnet 24 to maximize its efficiency. ) Between S poles Between the magnetic field MF4, the north pole of the upper auxiliary magnet 21 and the south pole of the lower auxiliary magnet 24, the magnetic field MF5 and the side auxiliary magnet 27 are located outside the separation guide 30 and the side auxiliary magnet 27 The magnetic field MF6 is respectively formed between the N poles of the main magnet 11 through the side front auxiliary plate 33 having a S pole of which maximizes its efficiency. In addition, although less influential than the composite magnetic field MF2-MF6, magnetic fields not shown are formed to surround the entire unit.

In this way, the basic magnetic field MF1 is formed between the main magnet 11 and the main plate 13, and the auxiliary magnets 21, 24, 27, the front auxiliary plate (32.33.34) and the rear auxiliary plate (35, 36 and 37 form complex magnetic fields MF2 to MF6. In this state, when the moving coil 14 vibrates together with the diaphragm 15 by the pressure of the sound source, the additionally formed complex magnetic field MF2 to MF6 block corrects the generation of induced electromotive force which is a unique role of the moving coil 14. By doing so, the individual waveforms of each frequency are not distorted, and the perfect waveform can be reproduced by inducing them to form a sine wave of a perfect waveform. In addition, the naturally occurring potatoes are formed by the complex magnetic fields (MF 2-MF6) wrapped around the unit. It prevents demagnetization and shields the external anti-magnetic field to maintain the best original sound.

In the present invention, despite the installation of the auxiliary magnet (21, 24, 27) and the auxiliary plate (32.33.34, 35, 36, 37), the magnetic flux density value of the main magnet 11 and the moving coil 14 is implemented Resistance value, the number of windings of the moving coil 14, the adjustment of the air amount to the first filter 16, the second filter 19 and the third filter 20, the density of each filter (16, 19, 20) There is no change in the basic design values conventionally used, such as the value, the amount of air for the vortex of the echo air tank 25.

Meanwhile, FIG. 5 illustrates a structure of a composite magnetic field speaker having an auxiliary plate according to another embodiment of the present invention. In the case of the speaker, the main magnet 11, the main plate 13, the pole plate 28, and the pole 29 constitute a basic magnetic circuit, and the moving coil 14 and the diaphragm 15 constitute a vibrometer. A characteristic of the present invention is to simulate a horizontal line connecting the upper surface of the main plate 13 and the upper surface of the pole 29 and the separation guide 30 for space separation on the vertical center upper surface of the pole 29. The upper auxiliary magnet 21, the upper front auxiliary plate 32 and the upper rear auxiliary plate 36 symmetrically to the vertical center line of the pole 29, and then attach the upper side of the pole plate 28 Imagine a horizontal line on the lower surface and attach the separation guide 30 to the lower part of the pole plate 28 for space separation on the lower surface of the vertical center of the pole 29 and then symmetrical to the vertical center line of the pole 29 below it. The lower auxiliary magnet 24, the lower front auxiliary plate 34 and the lower rear auxiliary plate 35 are installed, and a horizontal horizontal line is simulated on the upper surface of the pole 29, and the side auxiliary magnet ( Side auxiliary line to be in line with the horizontal center of The magnet 27 and the side front auxiliary plate 33 and the side rear auxiliary plate 37 are symmetrically installed, but the separation guide 30 is disposed between the main magnet 11. The ratio of the magnetic flux density distribution ratio of the auxiliary magnets 21, 24, 27, the separation distance from the main magnet 11, and the area and thickness of the auxiliary plates 32. 33. 34, 35, 36, 37 are shown in FIG. 3. Same as the case of microphone. And 31 is a spider

Like the microphone unit, the auxiliary plates (32.33.34, 35, 36, 37) can be attached to the respective auxiliary magnets (21, 24, 27) to realize more stable performance.

As shown in FIG. 5, in the composite magnetic field speaker having the auxiliary plates, a basic magnetic field MF 1 and a complex magnetic field MF 2 to MF 6 are formed.

Hereinafter, the effects on the dynamic unit of the present invention will be described. FIG. 6 is a photograph comparing output characteristics of sine waves for each frequency measured at 1 KHz with respect to the microphone of the present invention and the conventional microphone, and FIG. 7 is a diagram showing a speaker of the present invention and a conventional speaker. This is a comparison of the output characteristics of a sine wave measured at 10 kHz. 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 Figs. 6 and 7, the dynamic unit 1 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. Doing. However, in the conventional unit 4, the curved portions of the valleys and floors 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. Accordingly, it can be seen that the conventional unit 4 does not implement accurate original sound and reproduces the distorted sound.

8 is a graph comparing the overall frequency response characteristics of the microphone of the present invention and the conventional microphone. The instrument for measuring the output characteristics of the microphone 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). 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, it can be seen that the microphone of the prior art and the microphone of the present invention have no change in sensitivity and frequency response as shown in FIG. 8. That is, the electromotive force value generated when the moving coil is driven in the basic magnetic field circuit formed by the main magnet, the plate, and the yoke does not change even though the auxiliary magnetic field is additionally formed by the auxiliary magnet and the auxiliary plate according to the present invention. none.

On the other hand, Figure 9 is a graph showing a comparison of the characteristics of the sensitivity of the floor and valley of the frequency waveform output when the instantaneous signal (Trigger) of frequency 1Khz for the microphone unit and the conventional microphone unit according to the present invention, respectively . 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. FIG. 10 is an enlarged graph illustrating main parts of FIG. 9.

And Fig. 11 shows the individual frequencies obtained from the microphone B and the microphone C according to the conventional microphone A in the photograph and patent 10-0799862-00-00 (dynamic type unit having a complex magnetic field). It is a photograph of the waveform of a 1 kHz sine wave. Compared with the above three waveforms, the conventional microphone (A) has a limited line because the curved portions of the sine wave and the curved portion of the floor are distorted. It can be seen that it is more boosted and protrudes upward than the sinusoidal round curve waveform, and the tremor phenomenon is large in the waveform portion of the peak point. Patent 10-0799862-00-00 (Dynamic type unit having a compound magnetic field) The microphone (B) by the method of) shows that the microphone (A) is close to the limit line by correcting the distorted valleys and ridges of the microphone (A). ) Shows that the waveform of the microphone (B) can be more precisely corrected to show perfect sine wave reproduction. That is, it shows the best effect when using the auxiliary magnet with the auxiliary plate rather than the auxiliary magnet alone.
This means that the reproduction of the input or output signals applied from the original sound to the dynamic type units is possible.
9, 10, and 11, the equipment used to measure the output characteristics of each unit is an audio sweep generator (SWG 103, Japan Kokuyo), audio tracer (Audio Tracer, FCR 113, Japan Kokuyo) , Recorder (WX 4000, Japan Leader), speaker (Speaker, EV 2502, USA, Electro voice).

How to measure

The microphone unit of the present invention and the conventional microphone unit were provided with the speaker 1 m in the anechoic chamber. The speaker outputs a signal amplified by 1 W frequency of 1 kHz, and applies a momentary signal to each of the two units for 0.1 second, and then the difference between the floor and the valley of the frequency sensitivity and sine waveform output from each unit. 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. The same test was repeated twice to ensure the accuracy of the test.

Measurement result

As a result of the test, in the case of the conventional microphone unit, as shown by the red line (A) of FIG. You can see that it is distorted than the level of) and boosted to the upper side.

That is, the conventional microphone unit generates electromotive force by moving the moving coil attached to the diaphragm up and down within a single magnetic field composed of a main magnet and a plate when receiving a momentary signal. At this time, the driving range of the moving coil is out of the effective dense range of the basic magnetic field which generates the maximum effective electromotive force. In this case, the moving coil does not generate enough induced electromotive force, thereby lowering the electromotive force generation efficiency. However, the influence of natural vibration owned by moving coils and diaphragms increases. As a result, the ridges and valleys of the waveform appear distorted and spread.

However, even when the instantaneous signal is input, the microphone unit of the present invention derives only the output value for the value in response to the absolute value of the input signal. Therefore, as shown in FIG. 10, the blue line B maintains the same level as the line C on the right side, and it can be seen that there is no change.

That is, in the microphone unit of the present invention, since the auxiliary magnets and the auxiliary plates form a complex magnetic field in addition to the basic magnetic field circuit, even when the driving range of the moving coil is out of the optimum range of the basic magnetic field, deterioration of the electromotive force generation efficiency or diaphragm or moving The perfect sine wave can be realized by correcting distortion caused by the vibration of the coil itself.

The composite magnetic field dynamic type unit having the auxiliary plate according to the present invention can be applied to headphones, earphones, buzzers, etc. in addition to a microphone or a speaker.

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

2 is a cross-sectional view showing the structure of a conventional speaker.

3 is a cross-sectional view of a microphone according to an embodiment of the present invention.

4 is an enlarged view illustrating a state in which a composite magnetic field is formed in FIG. 2.

5 is a cross-sectional view of a speaker according to another embodiment of the present invention.

6 is a photograph of a sine wave waveform of an individual frequency of 1 kHz obtained from the microphone of the present invention and a conventional microphone.

FIG. 7 is a photograph of a sine wave waveform having an individual frequency of 10 khz obtained from a speaker of the present invention and a conventional speaker. FIG.

8 is a graph comparing the overall frequency response characteristics of the microphone of the present invention and the conventional microphone.

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

10 is an enlarged view of a main part of FIG. 9.
Fig. 11 is a sine wave of the individual frequency 1khz obtained from the microphone B and the microphone C according to the method of the conventional microphone A and patent 10-0799862-00-00 (dynamic type unit having a complex magnetic field). (sine wave) A picture taken with a waveform.

(Explanation of symbols for the main parts of the drawing)

10: housing 11: main magnet

12: yoke 13: main plate

14: moving coil 15: diaphragm

16,19,20: filter 17: lid

28: pole plate 29: pole

30: Separation guide 32,33,34 35,36,37: Auxiliary plate.

Claims (4)

In the dynamic unit which consists of the main magnet, the main plate and the yoke, the basic magnetic circuit, and the diaphragm and the moving coil and the vibration circuit, An auxiliary magnet having at least one front and rear auxiliary plate is installed on at least one of the upper, lower, and side surfaces of the main magnet so as to be spaced apart from the main magnet, and the total amount of magnetic flux density of the auxiliary magnet is determined by the main magnet. 25-100% of the magnetic flux density of the magnet, and the area of the front or rear auxiliary plate is the same area as the surface of each of the auxiliary magnets facing the main magnet and the thickness value of the front and rear auxiliary plate. Is a magnetic field dynamic unit having multiple auxiliary plates, wherein the main plate thickness is 25-100% of the thickness. The magnetic flux density value of the upper auxiliary magnet and the side auxiliary magnet is 25% of the magnetic flux density value of the main magnet, and the magnetic flux density value of the lower auxiliary magnet is 50% of the magnetic flux density value of the main magnet. The thickness of the front auxiliary plates of the upper and side auxiliary magnets is 25% of the thickness of the main plate, and the thickness of the rear auxiliary plates of the upper and side magnets is 50% of the thickness of the main plate and the front of the lower auxiliary magnets. And the thickness of the auxiliary plate is 50% of the thickness of the main plate, and the thickness of the rear auxiliary plate is 100% of the thickness of the main plate. The complex magnetic field dynamic unit of claim 1 or 2, wherein a separation distance between the main magnet and the auxiliary magnet to which the auxiliary plate is attached is a distance within 0.1 mm to a thickness of the main magnet. In the dynamic unit which consists of the main magnet, the main plate and the yoke, the basic magnetic circuit, and the diaphragm and the moving coil and the vibration circuit, An auxiliary magnet having front and rear auxiliary plates is installed on the upper, lower and side surfaces of the main magnet so as to be spaced apart from the main magnet, respectively. The magnetic flux density values of the upper auxiliary magnet and the side auxiliary magnet are respectively measured. 25% of the value, the magnetic flux density of the lower auxiliary magnet is 50% of the magnetic flux density value held by the main magnet, and the area of the front or rear auxiliary plate is the surface of each of the auxiliary magnets facing the main magnet. The area equal to the area, the thickness of the front auxiliary plates of the upper and side auxiliary magnets is 25% of the main plate thickness and the thickness of the rear auxiliary plates of the upper and side auxiliary magnets is 50% of the main plate thickness, The thickness of the front plate of the auxiliary magnet is Value of 50% and a thickness of the back plate of the auxiliary plate thickness of the composite magnetic field, a dynamic type unit with a multiple auxiliary plate, characterized in that 100% of the value of the main plate thickness.

Images