KR20060055641A - Condenser type speaker - Google Patents

Abstract

The disclosed condenser speaker is coated with an electrode forming conductor on one surface of a polymer film to form a conductor coating layer, and an aerogel is coated on the other surface of the polymer film to form an airgel layer, and a spaced distance from the diaphragm. An insulator formed at a central portion of a bipolar plate forming an anode together with a diaphragm, a PCB electrically connected to the diaphragm and the bipolar plate to apply an external AC voltage, and a receiving hole in which the diaphragm and the bipolar plate are accommodated. And it includes a case for receiving and fixing each of the above components and a negative pressure outlet formed on one surface.

According to the present invention described above, it is possible to improve the sound quality of the low frequency band by compensating the low range by the damping effect of the diaphragm in which the airgel layer is formed while structurally simplifying using one diaphragm.

Condenser speaker, aerogels, amplification degree, low pass compensation, diaphragm.

Description

Condenser Speaker {Condenser type speaker}

1 is a view for explaining the principle of a conventional condenser speaker,

2A and 2B are exploded perspective and assembly cross-sectional views of a conventional condenser speaker,

3 is an exploded perspective view of a condenser speaker according to the present invention;

4 is a cross-sectional view in the state assembled by FIG.

5 is a view showing the structure of the diaphragm shown in FIG.

<Description of the symbols for the main parts of the drawings>

10: insulator 12: receiving hole

20: diaphragm 22: polymer film

24: conductive coating layer 26: conductive ring

28: airgel layer 30: spacer

40: bipolar plate 42: fixed electrode

44: polymer film 46: negative pressure discharge hole

50: connecting member 60: PCB

70: case 72: negative pressure outlet

74: curled portion

The present invention relates to a condenser speaker, and more particularly, to a condenser speaker using a phenomenon in which a metal plate vibrates by a coulomb force (electric force between charges) when a high AC voltage is applied to the metal plate.

As the speaker is replaced by a new material speaker, the speaker becomes smaller and thinner, but the sound quality gradually decreases.

On the other hand, the sound quality of the condenser speaker reproduces the superior sound quality which cannot be approached by any means, so that the sound quality that can be produced in a special place such as a recording studio can be enjoyed.

This condenser speaker is composed of the fixed electrodes (1a, 1b) and the vibrating membrane (2) as shown in Figure 1, and uses a phenomenon that vibrates when a high AC voltage is applied to the metal plate by the Coulomb force (electric force between charges). .

That is, when the vibrating membrane 2 and the fixed electrodes 1a and 1b are installed facing each other, a high voltage is applied to form an electrostatic field, and then a voice signal is applied to the primary side of the modulation transformer 3, the voltage fluctuations are interrupted. The oscillation membrane 2 and the fixed electrodes 1a, 1b are pushed and pulled to generate sound, which is converted into sound.

The vibrating membrane (2) is a coating of metal on a thin film of plastic, the thickness of which is very thin, 10 ~ 20㎛ reproducing delicate sound, especially the high-frequency advantage can cover the entire audio frequency band with one speaker There is this.

However, playing at low frequencies requires a large area, and the sound pressure is weak, making it unreasonable to play loud sounds.

That is, a separate means for compensating for the low range is required, and there is a problem in that an area becomes large to manufacture a high output speaker.

In order to solve this problem, the present applicant installs two diaphragms coated with a conductor on one surface of the polymer film to be spaced apart from the bipolar plate, and applies alternating voltage to alter the thickness of the diaphragm, thereby compensating the low range or the high range to improve sound quality of the entire band. A patent has been applied for a condenser speaker that can output high sound pressure even in a small size (application number: 10-2004-0018659).

2A and 2B, the conventional condenser speaker has been previously applied, and is formed by coating a conductor for forming an electrode on one surface of the polymer film 220, and the electrode connection and the polymer film 220 on the coating surface 240. 2 diaphragms 200 and 600 formed with a ring 260 to maintain the shape of the diaphragm, and the diaphragm 200 and 600 are spaced apart from each other by a predetermined distance, and a protrusion 420 is formed outwardly and extends vertically from the protrusion 420. And an electrical connection member 700 connected to a ring of the one diaphragm 600, an electrical connection member 700 connected to the ring of the diaphragm 600, and the electrical connection member 440 and the electrical connection member 700. The PCB 800 for applying an external AC voltage to the diaphragm 200, 600 and the bipolar plate 400, and the protrusion 120 having the receiving groove 140 in which the protrusion 420 is accommodated are formed at an outer side thereof. Receiving hole for receiving the diaphragm 200, 600, the bipolar plate 400, the connecting member 700 And an insulator 100 having a 160 formed therein, and a case 900 which accommodates and fixes the above components and has a negative pressure outlet 920 formed on its front surface.

In the above configuration, when an alternating voltage is applied to the PCB 800 connected to the outside by using the diaphragm 200 and 600 and the bipolar plate 400 as an anode, the alternating voltage is applied to the bipolar plate 400 and the diaphragm 200 and 600, and at this time, the diaphragm The coated surface 240 and the anode forming diaphragm of the bipolar plate 400 vibrates to generate a sound pressure.

The sound pressure is discharged through the sound pressure outlet 920 formed in the case 900 to generate sound.

At this time, by changing the thickness of the upper and lower diaphragms 200 and 600 to compensate for low or high frequencies, two disadvantages of low frequency reduction and low volume that a conventional condenser speaker could not be miniaturized can be solved and miniaturized.

However, the condenser speaker should be provided with two diaphragms 200 and 600, and the bipolar plate 400 and the insulator 100 must have a complicated structure in order to electrically connect the two diaphragms with the PCB. Therefore, there is a limit in miniaturizing the condenser speaker. have.

The present invention devised to solve the above problems, by using a single diaphragm to provide a condenser speaker that can improve the sound quality of the low frequency band by compensating the low range by the damping effect of the diaphragm formed with an airgel layer while structurally simplified. Its purpose is to.

The condenser speaker of the present invention for achieving the above object is a conductive coating layer is formed by coating a conductor for forming an electrode on one surface of the polymer film, an airgel (aerogel) is applied to the other surface of the polymer film is a vibration plate formed with an airgel layer And a bipolar plate spaced apart from the diaphragm by a predetermined distance to form an anode together with the diaphragm, a PCB electrically connected to the diaphragm and the bipolar plate to apply an external AC voltage, and the diaphragm and the bipolar plate accommodated therein. The receiving hole includes an insulator formed at the central portion, and a case in which each of the above components is accommodated and fixed, and a negative pressure outlet is formed at one surface thereof.

Hereinafter, the configuration and operation of the present invention will be described with reference to the accompanying drawings.

3 is an exploded perspective view of a condenser speaker according to the present invention.

4 is a cross-sectional view in the state assembled by FIG.

As shown, the condenser speaker according to the present invention includes an insulator 10, a diaphragm 20, a spacer 30, a bipolar plate 40, a connecting member 50, a PCB 60, and a case 70. do.

As shown in FIG. 5, the diaphragm 20 coats a conductor for forming an electrode on one surface of the polymer film 22 to form a conductor coating layer 24, and an electrode at an outer adjacent portion of the conductor coating layer 24. A conductive ring 26 is formed to maintain the connection and the shape of the polymer film 22. An aerogel is applied to the other surface of the polymer film 22 to form an airgel layer 28.

The airgel is a low density material having low thermal conductivity, low refractive index, high specific surface area and porosity, and the like, such as silica, carbon, and resorcinol-formaldehyde.

Among them, silica aerogel applied to the present invention has a low elastic modulus 4 times lower than that of silica glass and the sound velocity (c), which is a sound transmission speed, is slower than air at 100 m / sec.

And since the density (ρ) is very low at 0.003 g / cm ³ , which is only three times the air density, the acoustic impedance (Z = ρc), which is expressed as the product of sound speed and density, is also very low.

In this way, by applying an airgel with a small acoustic impedance that hinders the flow of current to the polymer film 22, the low frequency can be compensated by one diaphragm 20 by the damping effect due to the frequency transmission characteristic of the airgel. .

Subsequently, in FIG. 3 and FIG. 4, the bipolar plate 40 is positioned at a predetermined distance from the diaphragm 20 as described above, and a ring-shaped spacer 30 is interposed therebetween to maintain a predetermined distance.

Since the diaphragm 20 may be discharged by external moisture in actual use, the bipolar plate 40 may have a structure that causes polarization by applying an electric field by applying the polymer film 44 to the fixed electrode 42.

A negative pressure discharge hole 46 is formed in the fixed electrode 42 and the polymer film 44 so that the negative pressure generated while vibrating the diaphragm 20 is discharged to smooth the vibration of the diaphragm 20.

The spacer 30 is made of an insulating film to form a space between the gaps.

As shown in the drawing, the insulator 10 positioned below the diaphragm 20 has a ring shape in which a receiving hole 12 is formed in a central portion thereof, and the diaphragm 20, the bipolar plate 40, and the spacer are formed in the receiving hole 12. 30, the connection member 50 is accommodated.

The connecting member 50 is in contact with the fixed electrode 42 to electrically connect the bipolar plate 40 to the pattern formed on the lower surface of the PCB 60 to apply an alternating voltage to the diaphragm 20.

The connecting member 50 may be a member surface made of a conductive material, and in particular, in the present invention, when the case 70 is curled into the ring-shaped conductive plate spring, the diaphragm 20 may be curled. Prevent back injury.

The PCB 60 is connected to the outside and different patterns are formed on the upper and lower surfaces so that the upper surface pattern is connected to the diaphragm 20 and the lower surface pattern is connected to the bipolar plate 40.

That is, the conductive ring 26 of the diaphragm 20 is in contact with the conductive case 70 and the cured portion 74 of the case 70 is connected to the upper surface of the PCB 60 and electrically connected thereto. The electrode plate 40 is electrically connected to the lower surface of the PCB 60 through the connecting member 50 of the conductive plate spring.

According to the electrical connection described above, an AC voltage may be applied to the bipolar plate 50 and the diaphragm 20.

The case 70 is an injection molded material made of a conductive metal such as aluminum, and a negative pressure outlet 72 is formed on a lower surface thereof, and the upper part of the case 70 is bent inwardly by a curing ring in a state where the above components are accommodated so that the components do not move. The condenser speaker is manufactured by assembling it.

When an alternating voltage is applied to the PCB 60 connected to the outside using the diaphragm 20 and the bipolar plate 40 as the anode in the assembled state as described above, the alternating voltage is the bipolar plate 40 and the diaphragm 20. In this case, the conductive coating layer 24 of the diaphragm 20 and the polymer film 44 of the bipolar plate 40 vibrate to generate a negative pressure by the same principle as in FIG. 1.

The sound pressure is discharged through the sound pressure outlet 72 formed in the case 70 to generate a sound.

In this case, the low range may be compensated for by the frequency transmission characteristic of the aerogel coated on the polymer film 22 of the diaphragm 20.

Accordingly, even if one diaphragm 20 is used, the sound quality of the low frequency band can be improved, and since only one diaphragm 20 needs to be electrically connected to the PCB 60, the insulator 10 and the bipolar plate 40 are provided. There is no need to do this complicated structure.

Therefore, the condenser speaker can be miniaturized and it is easy for the processing company to process during mass production.

As described above, according to the present invention, it is possible to improve the sound quality of the low frequency band by compensating the low range by the damping effect of the diaphragm in which the airgel layer is formed while structurally simplifying using one diaphragm.

It is to be understood that the invention is not limited to that described above and illustrated in the drawings and that many more modifications and variations are possible within the scope of the following claims.

Claims (8)

A diaphragm in which an electrode forming conductor is coated on one surface of the polymer film to form a conductor coating layer, and an airgel is applied to the other surface of the polymer film to form an airgel layer; A bipolar plate spaced apart from the diaphragm to form a positive electrode together with the diaphragm; A PCB electrically connected to the diaphragm and the bipolar plate to apply an external AC voltage; An insulator formed at a central portion of the receiving hole in which the diaphragm and the bipolar plate are accommodated; And Condenser speaker containing a case for accommodating and fixing each of the above components, the sound pressure outlet is formed on one surface. The method of claim 1, The conductive coating layer is a capacitor speaker, characterized in that the conductive ring to maintain the form of the electrode connection and the polymer film is in contact with the case. The method of claim 2, The upper part of the case is bent inward by curling (Curling) condenser speaker, characterized in that the components inside the case is fixed. The method of claim 3, And the cured portion of the case contacts the PCB so that the conductive ring is electrically connected to the PCB through the case. The method of claim 1, The bipolar plate is a capacitor speaker, characterized in that the polymer film is coated on the fixed electrode and the negative pressure discharge hole is formed in the fixed electrode and the polymer film. The method according to claim 1 or 5, And the bipolar plate and the PCB are electrically connected by a connection member positioned therebetween. The method of claim 6, The connecting member is a condenser speaker, characterized in that the ring-shaped conductive plate spring. The method of claim 1, And a spacer of an insulating film forming a space between anodes between the diaphragm and the bipolar plate.

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