KR20110106749A - Flat type speaker - Google Patents

Abstract

A flat panel speaker.
The present invention is a hollow frame having a predetermined size of the inner hole; A diaphragm provided with an outer end fixed to an inner side of the frame to enable vertical shaking; An upper end is attached to and fixed to a lower surface of the diaphragm, and a coil support portion extending a predetermined length downward, and a cylinder portion extending in a radial direction from an upper end of the coil support portion and being bent downward so as to be parallel to the coil support portion. And a vibrating body including the coil support part. A voice coil provided on an inner surface of the cylinder part facing the coil support part to generate an electric field when power is applied; And a magnetic field portion forming a vibration gap in which the cylinder portion is disposed without interference between the magnet and the yoke disposed in the frame, and generating a magnetic field interacting with the electric field of the voice coil.

Description

Flat Type Speaker {Flat Type Speaker}

The present invention relates to a flat panel speaker, and more particularly, to simplify the wiring structure for electrically connecting the voice coil and the terminal portion to each other without going through the diaphragm, and to perform the wiring work simply and quickly, and the specific portion thickness of the diaphragm. The present invention relates to a flat-panel speaker that can prevent poor vibration due to thickening, and can prevent impairing aesthetic appearance by external exposure of the coil.

In general, a speaker is a sound device that emits sound waves by converting an electric signal into vibration of a diaphragm to generate a small density wave in the air. The speaker interacts with magnetic fields formed by a permanent magnet and a voice coil. By converting the electrical signal into a voice signal.

In order to reproduce a wider frequency band in such a speaker, it is designed in consideration of various factors such as its vibration frequency, stiffness and energy absorption rate of the diaphragm. The material must be designed or wrinkled so that it can respond well to low frequency signals.

FIG. 7 is a cross-sectional view of a typical speaker, and referring to this, the speaker 1 supports a frame 11 having an internal space for accommodating the device, and vibrates inside the frame 11. A diaphragm 12 having a hollow through the center, an edge surround 13 for elastically supporting the outer end of the diaphragm 12 to the inner surface of the frame 11, and a hollow in the diaphragm 12 A bobbin 14 installed and having a cover plate 14a, a damper 15 having an outer edge fixed to the frame 11 and having an inner edge fixed to an outer surface of the bobbin 14, and the bobbin The voice coil 16 wound on the 14 and the permanent magnet 17 fixed to the frame so as to correspond to the voice coil 16, and is fixedly disposed between the frame 11 and the permanent magnet 17 Between the donut-shaped upper plate 18 and the permanent magnet 17 The bobbin 14 includes a yoke 19 disposed below the bobbin to form a vibration space in which the bobbin 14 vibrates up and down without interference.

The coil lead wire 16a extending from the voice coil 16 extends along the surface of the diaphragm 16 and then is fixed to the frame 11 via the gold wire 19a. Soldered).

Accordingly, when an electric signal containing voice information is input to the voice coil 16 through the terminal unit 19, the voice coil 16 generates an electric field according to the electric signal, and the voice coil 16 The bobbin 14 disposed in the vacuum space by the interaction between the generated electric field and the magnetic field generated from the magnetic field consisting of the permanent magnet 17 and the yoke 18 generates vibration by operating the diaphragm while vibrating up and down. .

Here, the edge surround 13 and the damper 15 determine the position of the vibrating portion consisting of the voice coil 16 and the bobbin 12 and directly involved in the smooth vertical movement of the vibrating portion and the vibration control of the diaphragm to output the speaker. In order to improve the sound quality and to provide a restoring force during the vibration of the bobbin 14 and the diaphragm 12, in particular the damper 15 controls the vibration of the diaphragm in a speaker that requires a relatively high output sound distortion This is to provide the restoring force necessary for the reciprocating motion of the bobbin 14 and the diaphragm 12 to pop up and down to react normally without this.

However, the damper 15 installed to improve sound quality has to be fixed and installed so as to connect between the frame 11 and the vibrating bobbin 14, which are supporting structures, so that the work of adhesively fixing and installing the damper is very troublesome. There was

In addition, the voice coil 16 has a very thin wire diameter, which is weak to external physical impact, so that the coil coil 16a extended from the voice coil 16 installed in the bobbin 14 and adhered to the surface of the diaphragm 12 is fixed. The end of the) is soldered and connected to the end of the thick gold wire (19a) that can withstand the shock due to the vibration of the diaphragm 12, and the other end is soldered connected to the terminal portion 19, which complicates the manufacturing process and reduces work productivity In addition, the manufacturing cost was increased, and the external appearance of the coil lead wire 16a adhered to the upper surface of the diaphragm 12 acted as a factor that hindered appearance appearance.

In addition, the coil lead wire 16a is fixed to the surface of the diaphragm while the sound quality is deteriorated due to split vibration or deflection vibration caused by thickening of a specific portion of the diaphragm.

In addition, it is difficult to precisely control the position of the vibrator including the voice coil and bobbin, there was a limit to precisely and efficiently control the vibration characteristics of the vibrating plate 16 up and down and the vibration plate 16 to obtain excellent sound quality.

Accordingly, the present invention is to solve the above problems, the object is to simplify the wiring structure for electrically connecting the voice coil and the terminal unit without going through the diaphragm, it is possible to easily and quickly perform the wiring work, The present invention aims to provide a flat speaker that can prevent the poor vibration caused by the thickening of a specific portion of the diaphragm while preventing the aesthetic appearance caused by the external exposure of the coil.

Another object of the present invention is to provide a flat-panel speaker capable of precisely and efficiently controlling the vertical vibration and vibration characteristics of the vibration unit by precisely performing the position control of the vibration unit including the voice coil and the bobbin.

Still another object of the present invention is to provide a flat panel speaker that can be applied to a product of a light and thin, so that the design can be slim and small.

The present invention as a specific means for achieving the above object, the hollow frame having a predetermined size of the inner hole; A diaphragm provided with an outer end fixed to an inner side of the frame to enable vertical shaking;

An upper end is attached to and fixed to a lower surface of the diaphragm, and a coil support portion extending a predetermined length downward, and a cylinder portion extending in a radial direction from an upper end of the coil support portion and being bent downward so as to be parallel to the coil support portion. And a vibrating body including the coil support part.

A voice coil provided on an inner surface of the cylinder part facing the coil support part to generate an electric field when power is applied;

The present invention provides a flat speaker including a magnetic field generating a magnetic gap that forms a vibration gap between the magnet disposed in the frame and the yoke without interference, and generates a magnetic field that interacts with the electric field of the voice coil.

Preferably, the diaphragm is provided via an elastic member for the edge fixed to the inside of the frame.

Preferably, the coil support is provided with an adhesive plate fixed to the diaphragm integrally on the upper end or detachable.

Preferably, the coil support portion is provided with a contact plate that is assembled to the central hole formed in the central region of the diaphragm integrally or detachably at the top.

Preferably, the coil support portion is provided with a detachable contact plate integrally or detachable to the upper end is inserted through the central hole formed through the central region of the diaphragm exposed to the upper portion of the diaphragm.

Preferably, the cylinder portion is extended upwardly or downwardly in parallel with the coil supporting portion from an outer end of the upper sealing surface and horizontally or inclined radially from the coil supporting portion, and is opened downwardly, and the voice is opened. It includes a vertical plane on which the coil is installed.

 More preferably, the upper sealing surface is provided with at least one air pressure adjustment vent formed to be formed so as to adjust the air pressure in the cylinder portion during the vertical vibration of the vibrating body.

Preferably, the voice coil includes a coil lead wire including a positive electrode terminal and a negative electrode terminal which are provided in a spring shape on the coil support part to have a free field having a margin of the maximum vibration width of the diaphragm and connected to the terminal part.

Preferably, the magnetic field is an external magnet of the magnet is disposed outside the yoke and the outer surface of the magnet is fixed to the inner surface of the frame or the magnet is disposed inside the yoke so that the outer surface of the yoke It is made of a magnetically fixed shape by interviewing the inner surface.

More preferably, the magnet or yoke of the magnetic field portion provided in the inner or outer shape further comprises a plate, the plate is a horizontal plate, the magnet or provided on the upper surface of the magnet or yoke fixed to the inside of the frame The vertical plate is provided on the vertical surface of the yoke, the horizontal plate and the vertical plate is provided with any one of the integral plate connected integrally.

More preferably, the outer surface of the cylinder portion and the corresponding plate form a contact portion in contact with each other, and the contact portion is surface treated to minimize frictional resistance.

More preferably, the outer surface of the cylinder portion and the corresponding magnet or yoke of the magnetic field portion to form a contact portion in contact with each other, the contact portion is surface-treated to minimize the frictional resistance.

Preferably, the cylinder portion and the plate comprises a sealing material made of a magnetic material or a non-magnetic material to minimize the frictional resistance generated in the contact portion in contact with each other, cool the frictional heat, and seal the contact portion.

More preferably, the sealing material is made of a magnetic fluid affected by the magnetic force transmitted through the magnetic field.

More preferably, the magnetic fluid is located at the upper end of the cylinder portion and the plate in contact with each other or at the boundary region between the outer surface of the cylinder portion and the outer surface of the plate.

Preferably, at least one air passage between the frame and the magnetic field portion, the air passage at least one inner recess formed in the inner surface of the frame, and the magnet or yoke fixed to the inner surface of the frame It is provided by at least one outer recess that is recessed to correspond to the inner groove between the outer surface of the.

According to the present invention, the voice coil is provided on the cylinder portion of the vibrating body attached to the vibrating plate, and the coil lead line of the voice coil is connected to the terminal portion via the coil supporting portion of the vibrating body, thereby passing the voice coil and the terminal portion without passing through the vibrating plate. The electrical connection to each other simplifies the wiring structure of the voice coil, and enables easy and quick connection of the voice coil to improve productivity, reduce manufacturing costs, and fundamentally eliminate external exposure of the voice coil. Therefore, it is possible to prevent aesthetic observation by external exposure of the voice coil, and to improve the sound quality of the speaker by preventing the poor vibration caused by the thickening of the specific part by the voice coil attached to the diaphragm.

In addition, it is possible to precisely and efficiently control the position of the vibrator including the voice coil and bobbin in the internal space of the frame, so that it is possible to obtain sound quality of excellent quality, and to be designed for slim and small sized products. Can be.

1 is a cross-sectional view of a flat panel speaker according to a first exemplary embodiment of the present invention.
2 is a perspective view illustrating a vibrating body employed in a flat panel speaker according to a first exemplary embodiment of the present invention.
3A and 3B are diagrams illustrating a coupling state between a vibrating body and a diaphragm employed in a flat panel speaker according to a first embodiment of the present invention.
4 is a cross-sectional view of a flat panel speaker according to a second exemplary embodiment of the present invention.
5 is a cross-sectional view illustrating a flat panel speaker according to a third exemplary embodiment of the present invention.
6 is a cross-sectional view illustrating a flat panel speaker according to a fourth exemplary embodiment of the present invention.
7 is a diagram illustrating a general speaker.

Preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

As shown in FIG. 2, the flat panel speaker 100 according to the first embodiment of the present invention includes a hollow frame 110, a diaphragm 120, a vibrator 130, a voice coil 140, and a magnetic field part. And 150.

The hollow frame 110 has an inner hole to form an inner space of a predetermined size to accommodate the diaphragm 120, the vibrating body 130, the voice coil 140 and the magnetic field unit 150 therein Is made of.

The hollow frame 110 may be provided in the form of any one of circular, oval or square, the open top is not shown to be sealed by the diaphragm 120 or to prevent damage to the internal components from the external environment. It may be covered by a cover member and sealed.

The diaphragm 120 may be provided with a thin diaphragm which is fixed to the outer edge of the outer end of the frame 110 to be bonded with a bonding agent to enable vertical shaking.

The diaphragm 120 is press-molded film material such as PEI (Polyetherimide), PET (Polyethylene Terephthalate), PC (Polycarbonate) at a high temperature and high pressure of about 200 ℃ to facilitate sound generation by up and down vibration It may be made of a thin thickness of μm, but is not limited thereto and may be made of various film materials and thicknesses according to the design purpose of the speaker.

Here, the diaphragm 120 may be made of an elastic material such as rubber or polyurethane, and may be installed inside the frame 110 through an edge elastic member 112 fixed to the inside of the frame 110. . Accordingly, by virtue of the elastic force of the edge elastic member 112 connected to the outer edge of the diaphragm 120, the vibration of the diaphragm 120 and the vibrator 130 may be controlled to obtain better sound quality. It is.

In addition, it is preferable to form a fixing groove 114 to which the edge elastic member 112 is inserted and fixed on the inner surface of the frame 110.

At this time, the edge elastic member 112 is composed of an upper elastic member (112a) and a lower elastic member (112b) divided into upper and lower, it is shown that the outer edge of the diaphragm 120 is inserted and fixed therebetween. Although described, the present invention is not limited thereto, and an outer edge of the diaphragm 120 may be inserted into and fixed to an insertion groove formed on an inner surface of the edge elastic member 112.

The vibrating body 130 includes a coil support part 131 and a cylinder part 132 and is provided with a vibrating mass that vibrates up and down together with the vibration plate. The coil support part 131 is a lower surface of the vibration plate 120. The upper end may be fixed by attaching the adhesive to the lower end to extend a predetermined length to the bottom to be a rod member in which the voice coil 140 is wound.

The cylinder part 132 may extend in a radial direction from an upper end of the coil support part 131 and bend downward to be parallel to the coil support part 131 so that the lower part is open and the upper part is formed in a hollow hollow cross section. .

Here, the coil support 131 is fixed to the center region of the lower surface of the diaphragm 120 by an adhesive to facilitate the bonding operation while increasing the contact fixing force between the diaphragm 120 and the vibrating body 130. It is preferable to provide the adhesive plate 133 to be integrally provided at the top or to be detachable.

As shown in FIG. 3 (a), the contact plate 133 is inserted into and fixed to the central hole 125 formed in the central region of the diaphragm 120, or as shown in FIG. 3 (b). In the same manner, the central hole 125 may be inserted into the upper end of the coil support part 131 exposed to the upper portion of the diaphragm 120.

In this case, the contact plate 133 detachably assembled to the coil support 131 may be assembled to any one of an adhesive method, a fastening method, and a fitting method on an upper end of the coil support 131.

The cylinder part 132 is parallel to the upper sealing surface 132a extending horizontally or inclined radially from the coil supporting part 131 and the coil finger part 131 from the outer end of the upper sealing surface 132a. It extends a predetermined length directly below and is opened downward, and includes a vertical surface 132b on which the voice coil 140 is installed.

Here, the upper sealing surface 132a is illustrated and described as being integrally connected to the outer surface of the coil support 131, but is not limited thereto. The coil may be provided as an independent member separated from the coil support 131. It may be assembled to the support 131.

 The upper sealing surface 132a is formed so as to control the upper and lower vibration width of the vibrating body 130 by adjusting the air pressure generated inside the cylinder portion 132 during the vertical vibration of the vibrating body 130 At least one air pressure adjusting vent 134 through which air is freely provided.

Here, the vent 134 is illustrated and described as being formed in a circular hole through the upper sealing surface 132a, but is not limited thereto. The vent 134 may be formed in a straight or arc slit hole.

The vibrating body 130 is a structure that vibrates up and down together with the diaphragm, and is preferably made of a non-magnetic material having a low specific gravity having abrasion resistance and heat resistance. The vibrating body 130 can adjust the vibration width by virtue of the weight change of the vibrating body 130. At least one weight body may be provided in the coil support 131 or the cylinder 132.

The voice coil 140 is provided on an inner surface of the cylinder part 132 facing the coil support part 131 and is an electric field part that generates an electric field that interacts with a magnetic field generated by the magnetic field part 150 when power is applied. Is done.

The voice coil 140 is formed of a coil body that is wound a plurality of times along the inner side of the vertical surface of the cylinder portion 132, and includes a positive electrode terminal 141 and a negative electrode terminal 142 connected to the terminal unit 160 to be described later. The coil lead wire 145 is formed in a spring shape on the coil support 131 to have a free field having a margin of more than the maximum vibration width of the diaphragm 120.

The positive and negative terminals 141 and 142, which are both ends of the coil leader line 145, are electrically connected to the terminal unit 160 fixed to the magnetic field unit 150.

Here, the coil support 131 provided with the coil leader line 145 is disposed so as not to interfere with the magnetic field in the placement hole formed in the central region of the magnet or yoke constituting the magnetic field 150.

The voice coil 140 is fixed to the inner surface of the cylinder portion of the vibrating body 130 in an annular ring shape, and the coil lead wire 145 drawn out to be electrically connected to the terminal portion has a central region of the magnetic field portion 150. It has a wiring structure connected to the terminal via the coil support 131 is disposed.

Accordingly, the voice coil 140 is connected to the terminal unit 160 as compared to the complicated and cumbersome wiring process and connection structure in which the coil lead wire extending to the diaphragm is connected to the terminal unit via a thick gold wire. The wiring structure and the wiring process can be simplified, and the coil lead wire is essentially excluded from the outer surface of the diaphragm, so that a certain part of the diaphragm is thickened by the voice coil attached to the diaphragm. It can fundamentally exclude the split or deflection vibration caused by the loss.

Since the coil lead wire is attached to the diaphragm and vibrates up and down together with the vibrating body in the inner space of the cylinder part of the vibrating body coupled to the diaphragm without being vibrated up and down, the outer diameter is thin and the speaker coil is vulnerable to external shock. It will improve the durability of.

 The magnetic field unit 150 includes a magnet 151 and a yoke 152 disposed in a frame to interact with an electric field generated by the voice coil 140 to generate a magnetic field causing vertical vibration of the diaphragm 120. It happens

The magnet 151 is magnetized in a vertical direction is provided as a permanent magnet for generating a magnetic force of a certain intensity, the yoke 152 to induce a magnetic force generated in the magnet to form a magnetic field interacting with the electric field of the voice coil It is made of a magnetic material, the lower surface is provided with a terminal portion 160 that is electrically connected to the positive and negative terminals of the voice coil 140.

As shown in FIG. 1, the magnetic field unit 150 has an external shape in which the magnet 151 is disposed on the outside of the yoke 152 so that the outer surface of the magnet 151 is the inner surface of the frame 110. As shown in FIG. 4, the magnet 151 is disposed inside the yoke 152, and the outer surface of the yoke 152 is formed inside the yoke 152. It may be made of a structure that is fixed by interviewing the inner surface.

Here, the magnet 151 or the yoke 152 of the magnetic field unit 150, which is provided in an inner or outer shape, is made of a magnetic material to form a magnetic flux that is a magnetic field flow passing through the voice coil 140. The plate 155 includes a horizontal plate 155a provided on the upper surface of the magnet 151 fixed to the inner side of the frame or the yoke 152 fixed to the inner side of the frame, and the magnet. 151 or the vertical plate 155b provided on the vertical surface of the yoke 152, the horizontal plate 155a and the vertical plate 155b may be made of any one of the integral plate connected integrally.

In addition, the outer surface of the cylinder portion 132 and the plate 155 corresponding thereto are illustrated and described as being supported in contact with each other so that the up and down vibration of the vibrating body 130 is smoothly performed, but is not limited thereto. The outer surface of the cylinder portion 132 and the magnet 151 or yoke 152 of the magnetic field unit 150 corresponding thereto also support the vertical movement of the vibrating body while being supported in contact with each other to smoothly move up and down Can be done.

The contact between the cylinder portion 132 and the plate 155 or any one of the cylinder portion 132, the magnet 151, and the yoke 152 is illustrated and described as being in surface contact with each other, but is not limited thereto. It may be in line contact or point contact.

The outer surface of the cylinder portion 132 and the contact surface of the plate 155 or the contact surface of the magnetic field unit 150 corresponding to the outer surface of the cylinder portion 132 to minimize the frictional resistance generated by the contact portion during the vertical vibration of the vibrating body It is preferable to coat or apply a material having a low coefficient of friction to surface-treat the surface.

In addition, the contact portion is cooled between the cylinder portion 132 and the plate 155 while cooling the frictional heat generated at the contact portion while lubricating to minimize the frictional resistance generated at the contact portion during the vertical vibration of the vibrating body 130. It may be provided with a sealing material 157 made of a magnetic material or a nonmagnetic material to seal the.

The sealing material 157 may be made of a magnetic fluid affected by the magnetic force transmitted through the magnetic field unit 150.

The magnetic fluid is a colloidal shape that stabilizes and disperses a magnetic powder in a liquid, and then adds a surfactant to prevent precipitation or aggregation of magnetic powder due to gravity or a magnetic field. Examples thereof include triiron tetraoxide and iron- Cobalt alloy fine powder is dispersed in oil and water, and recently cobalt is dispersed in toluene. The magnetic powder is ultrafine powder of 0.01 ~ 0.02㎛, and has brown movement peculiar to ultrafine particles. Even if the back is applied, the concentration of the magnetic powder particles in the fluid is kept constant.

Here, the magnetic fluid is illustrated and described as being located at the upper end of the cylinder portion 132 and the plate 155 in contact with each other, but is not limited thereto. As illustrated in FIG. 5, the cylinder portion ( It may be located at a boundary area between the outer surface of 132 and the outer surface of the plate 155.

Accordingly, an upper space between the diaphragm 120 and the magnetic field unit 150 and the coil of the vibrating body 130 are sealed by sealing the upper part of the vibration gap in which the cylinder part 132 is disposed by the sealing material 157. By completely isolating between the lower space in which the support 1132 is disposed, it is possible to effectively control the vibration of the diaphragm by causing a change in air pressure in the lower space during the vertical vibration of the diaphragm 120.

On the other hand, between the frame 110 and the magnetic field unit 150 to the upper space and the air discharge from the upper space formed between the diaphragm 120 and the magnetic field unit 150 during the vertical vibration of the diaphragm 120 At least one air passage (A) is formed to facilitate the inflow of the air.

The air passage (A) is at least one inner recess formed in the inner surface of the frame and at least one recessed to correspond to the inner groove between the outer surface of the magnet or yoke fixed to the inner surface of the frame It is provided by an outer groove.

As shown in FIG. 6, the flat panel speaker 100 includes a plurality of vibrating bodies 130 in the diaphragm 120 provided in the frame, and a voice coil provided in each of the plurality of vibrating bodies 130. 140 is a multi-driven flat tongue speaker having a magnetic field unit 150 corresponding to each other, and a central hole in which the coil support unit of the vibrator 130 is disposed in the magnetic field unit 150 provided in the frame. It may be provided.

A power source including a voice signal of a predetermined frequency band is input to the voice coil 140 provided in the vibrator 130 of the flat panel speaker 100 having the above-described configuration, and thus the electric field of a constant intensity is applied to the voice coil 140. When this occurs, the vibration plate and the vibrating plate vibrate finely up and down by the interaction between the magnetic fields generated by the magnetic field unit 140 to generate sound or sound.

While the invention has been shown and described with respect to particular embodiments, it will be understood that various changes and modifications can be made in the art without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

110 frame 112 elastic member
129: diaphragm 130: vibrating body
131: coil support 132: cylinder
133: contact plate 134: vent
140: voice coil 145: coil lead wire
150: magnetic field unit 151: magnet
152: yoke 155: plate
157: magnetic fluid 160: terminal

Claims (16)

Hollow frame having a predetermined size of the inner hole;
A diaphragm provided with an outer end fixed to an inner side of the frame to enable vertical shaking;
An upper end is attached to and fixed to a lower surface of the diaphragm, and a coil support portion extending a predetermined length downward, and a cylinder portion extending in a radial direction from an upper end of the coil support portion and being bent downward so as to be parallel to the coil support portion. And a vibrating body including the coil support part.
A voice coil provided on an inner surface of the cylinder part facing the coil support part to generate an electric field when power is applied;
And a magnetic field portion for forming a vibration gap in which the cylinder portion is disposed without interference between the magnet disposed in the frame and the yoke, and generating a magnetic field interacting with the electric field of the voice coil. The method of claim 1,
The diaphragm is a flat speaker, characterized in that provided via the elastic member for the edge fixed to the inside of the frame. The method of claim 1,
The coil support unit is provided with an adhesive plate fixed to the diaphragm to be integrally provided at the top or to be detachable flat speaker. The method of claim 1,
The coil support unit is provided with a contact plate to be integrally provided on the upper end or assembled into a central hole formed in the central region of the diaphragm plate, characterized in that the speaker. The method of claim 1,
The coil support is inserted into the central region of the diaphragm plate through the central hole is inserted into the flat plate speaker, characterized in that provided with or detachable integrally with a contact plate assembled on the upper end exposed to the upper portion of the diaphragm. The method of claim 1,
The cylinder portion extends horizontally or inclined radially from the coil support portion in an upward direction, and extends downwardly to a lower portion so as to be parallel to the coil finger portion from an outer end of the upper sealing surface, and opens downward. Flat speaker comprising a vertical surface. The method of claim 6,
The upper sealing surface is a flat speaker, characterized in that it comprises at least one air pressure adjustment vent formed to be formed so as to adjust the air pressure inside the cylinder portion during the vertical vibration of the vibrating body. The method of claim 1,
The voice coil is provided in the coil support portion in the form of a spring to have a free field having a margin of the maximum vibration width of the diaphragm, and includes a coil lead wire including a positive electrode terminal and a negative electrode terminal connected to the terminal portion speaker. The method of claim 1,
The magnetic field is disposed outside the yoke and the magnet is disposed inside the yoke or the outer surface of the magnet is fixed to the outer surface of the interview by the inner surface of the frame so that the outer surface of the yoke to the inner surface of the frame Flat speaker characterized in that the inner magnet is fixed to the interview. 10. The method of claim 9,
The magnet or yoke of the magnetic field provided in the magnetic or external type further comprises a plate,
The plate may be any one of a horizontal plate provided on the upper surface of the magnet or yoke fixedly installed inside the frame, a vertical plate provided on the vertical surface of the magnet or yoke, and an integrated plate in which the horizontal plate and the vertical plate are integrally connected. Flat panel speaker, characterized in that provided. The method of claim 10,
The outer surface of the cylinder portion and the corresponding plate to form a contact portion in contact with each other, the contact portion is a flat speaker, characterized in that the surface treatment to minimize the frictional resistance. The method of claim 10,
The outer surface of the cylinder portion and the magnet or yoke of the corresponding magnetic field to form a contact portion in contact with each other, the contact portion is characterized in that the surface treatment to minimize the frictional resistance. The method of claim 1,
And a sealing material made of a magnetic material or a non-magnetic material to minimize frictional resistance generated at the contact portions that are in contact with each other, to cool the frictional heat, and to seal the contact portions between the cylinder portion and the plate. The method of claim 13,
The sealing material is a flat speaker, characterized in that made of a magnetic fluid affected by the magnetic force transmitted through the magnetic field. The method of claim 14,
And the magnetic fluid is positioned at an upper end of the cylinder portion and the plate in contact with each other or at a boundary region between the outer surface of the cylinder portion and the outer surface of the plate. The method of claim 1,
Preferably, at least one air passage between the frame and the magnetic field,
The air passage includes at least one inner groove recessed in the inner surface of the frame and at least one outer recess recessed to correspond to the inner groove between the outer surface of the magnet or yoke fixed to the inner surface of the frame. Flat speaker provided by.

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