WO2022169263A2

WO2022169263A2 - Linear speaker

Info

Publication number: WO2022169263A2
Application number: PCT/KR2022/001691
Authority: WO
Inventors: 왕기성; 유종민
Original assignee: 대홍테크뉴(주)
Priority date: 2021-02-05
Filing date: 2022-02-03
Publication date: 2022-08-11
Also published as: KR20220113091A; WO2022169263A3; KR102433620B1

Abstract

The present invention relates to a linear speaker and is for providing a linear speaker for easily assembling a speaker having a diaphragm in a shape extending in one direction.

Description

linear speaker

This application is filed on 2021.02.05. Claims the benefit of priority based on the Korean Patent Application No. 10-2021-0016849 filed, and all contents disclosed in the documents of the Korean patent application are incorporated as a part of this specification.

The present invention relates to a linear speaker, and to a linear speaker for easily assembling a speaker having a diaphragm extending in one direction.

A linear speaker has a big difference in structure and performance in amplifying sound compared to a typical point source speaker, and as the space increases, the use of the line array speaker may be more advantageous than the use of the point source speaker.

A linear speaker is a group of omni-directional radiation speaker elements, specifically, a speaker device having a linear diaphragm extending in one direction. Linear speakers can be very effective at radiating sound over long distances.

The linear speaker differs from the existing speaker having a disk-shaped diaphragm in the structure or configuration of a driving part for vibrating the diaphragm, and requires a technique for assembling the speaker easily and quickly by minimizing interference between parts during the assembly process.

The present invention relates to a linear speaker, and to provide a linear speaker for easily assembling a speaker having a diaphragm having a shape extending in one direction.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the following description. will be able

The linear speaker of the present invention includes: a diaphragm that vibrates in a first direction, which is an up-down direction, and extends in a second direction perpendicular to the first direction; a coil substrate having an upper end coupled to a lower surface of the diaphragm and extending in the second direction; a first magnetic force unit spaced apart from one side of the coil substrate by a predetermined distance in a third direction perpendicular to the first direction and the second direction; a second magnetic force unit spaced apart from the other side of the coil substrate by a predetermined distance in the third direction; a first frame to which the first magnetic unit is fixed; and a second frame to which the second magnetic force part is fixed and coupled to the first frame with the coil substrate interposed therebetween.

The linear speaker of the present invention minimizes the interference between the first magnetic force unit and the second magnetic force unit used as a driving unit in the assembly process, so that assembly can be performed easily and quickly.

The linear speaker of the present invention utilizes the symmetrical structure of the linear speaker, and by manufacturing the first frame and the second frame with the same mold, it is possible to minimize the resources required for manufacturing.

1 is a perspective view showing a linear speaker of the present invention.

2 is an exploded perspective view showing the linear speaker of the present invention.

3 is a plan view illustrating a first frame and a second frame.

4 is a bottom view showing a first frame and a second frame.

5 is a perspective view illustrating a first frame.

6 is a plan view showing the linear speaker of the present invention.

7 is a bottom view showing the linear speaker of the present invention.

In the linear speaker of the present invention, a first seating groove is formed on an upper surface or a lower surface of the first frame in which the first magnetic force part is inserted and seated in the first direction, and the upper or lower surface of the second frame A second seating groove in which the second magnetic force part is inserted and seated in the first direction may be formed.

In the linear speaker of the present invention, a first assembly hole may be formed on a bottom surface or a ceiling surface of the first seating groove, and a second assembly hole may be formed on a bottom surface or a ceiling surface of the second seating groove.

* In the linear speaker of the present invention, a first opening is formed in the first frame so that one surface of the first magnetic force part seated in the first seating groove is exposed to the one surface of the coil substrate, and the second frame has the A second opening through which one surface of the second magnetic force portion seated in the second seating groove is exposed to the other surface of the coil substrate may be formed.

In the linear speaker of the present invention, a length of the first seating groove in the second direction is longer than a length of the first opening in the second direction, and a length of the second seating groove in the second direction is The length of the second opening in the second direction may be longer than that of the second opening.

In the linear speaker of the present invention, the first frame is provided with a first coupling means formed on a surface facing the second frame, and the second frame has a second coupling means formed on a surface facing the first frame is provided, the first frame is provided with a third coupling means coupled to the second coupling means on one surface facing the second frame, and the second frame has the first frame on one surface facing the first frame A fourth coupling means for coupling with the first coupling means may be provided.

In the linear speaker of the present invention, the first coupling means and the third coupling means are positioned in the second direction with the first seating groove therebetween, and the second coupling means and the fourth coupling means are the second coupling means. It may be positioned with the second seating groove interposed therebetween.

In the linear speaker of the present invention, a plurality of first ventilation holes for ventilation in the first direction are formed in the first frame, and a plurality of second ventilation holes for ventilation in the first direction are formed in the second frame. it may be

In the linear speaker of the present invention, the diaphragm passes through the flexible frame so as to cover the first seating groove, the second seating groove, the first ventilation hole, and the second ventilation hole, the first frame and the second frame. It may be coupled to the upper surface of the.

In the linear speaker of the present invention, a lower end of the coil substrate is coupled to the coil substrate and extended in the second direction, one end in the third direction is coupled to the lower surface of the first frame, and the other end in the third direction is It may further include a flexible support coupled to the lower surface of the second frame.

In the linear speaker of the present invention, the flexible support part may have a plurality of pleats extending in the second direction.

In the linear speaker of the present invention, the flexible support part may be coupled to lower surfaces of the first frame and the second frame so as not to cover the first and second ventilation holes.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings. In this process, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator. Definitions of these terms should be made based on the content throughout this specification.

In the description of the present invention, it should be noted that the terms “center”, “top”, “bottom” “left”, “right”, “vertical”, “horizontal”, “inside”, “outside”, “one side” The azimuth or positional relationship indicated by ”, “other surface”, etc. is based on the azimuth or positional relationship shown in the drawings, or the orientation or positional relationship that is usually placed when using the product of the present invention, for the description and brief description of the present invention. It should not be construed as limiting the present invention, as it does not necessarily suggest or imply that the indicated device or element must be configured or operated in the specified orientation with the specified orientation.

1 is a perspective view showing a linear speaker of the present invention. 2 is an exploded perspective view showing the linear speaker of the present invention. 3 is a plan view illustrating the first frame 100 and the second frame 200 . 4 is a bottom view illustrating the first frame 100 and the second frame 200 . 5 is a perspective view illustrating the first frame 100 . 6 is a plan view showing the linear speaker of the present invention. 7 is a bottom view showing the linear speaker of the present invention.

Hereinafter, the linear speaker of the present invention will be described in detail with reference to FIGS. 1 to 7 .

1 and 2, the linear speaker of the present invention includes a diaphragm 500 that vibrates in a first direction, which is an up-down direction, and extends in a second direction perpendicular to the first direction; a coil substrate 600 having an upper end coupled to a lower surface of the diaphragm 500 and extending in the second direction; a first magnetic force unit 300 spaced apart from one side of the coil substrate 600 by a predetermined distance in the first direction and a third direction perpendicular to the second direction; a second magnetic force unit 400 spaced apart from the other side of the coil substrate 600 by a predetermined distance in the third direction; a first frame 100 to which the first magnetic unit 300 is fixed; and a second frame 200 to which the second magnetic force unit 400 is fixed and coupled to the first frame 100 with the coil substrate 600 interposed therebetween.

Hereinafter, in FIGS. 1 to 7 , a z-axis direction, which is an up-down direction, is referred to as a first direction, and an x-axis direction that is perpendicular to the first direction and is a longitudinal direction of the diaphragm 500 is referred to as a second direction, and the first direction and A y-axis direction perpendicular to the second direction is referred to as a third direction.

In the speaker device of the present invention, the first frame 100 and the second frame 200 may be formed axially symmetrically with respect to a straight line parallel to the first direction perpendicular to the surface of the diaphragm 500 . That is, the first frame 100 and the second frame 200 may have an axially symmetric relationship with each other based on the z-axis direction in a three-dimensional space. For example, if the first frame 100 is rotated 180 degrees based on a symmetry axis (an axis parallel to the z-axis), the second frame 200 may be formed. Accordingly, the first frame 100 and the second frame 200 may be manufactured using the same mold.

As shown in FIG. 2, the linear speaker of the present invention has a linear shape of the diaphragm 500 for generating sound. Specifically, the diaphragm 500 is formed in a plane perpendicular to the first direction, It may have a constant width in three directions and may have a shape extending in the second direction. That is, in the linear speaker of the present invention, the diaphragm 500 may be a plane having a length in the second direction longer than a length in the third direction. The diaphragm 500 is a plate made of a honeycomb material, and may be lightweight and have strong bending stress. In addition, the diaphragm 500 made of a honeycomb material may have an advantage in the straightness of sound.

As shown in FIG. 2 , the flexible frame 510 may be connected along the edge of the diaphragm 500 . The flexible frame 510 may be provided in a ring shape, and the rim of the diaphragm 500 may be connected to the inner periphery, and the outer periphery may be connected to the upper surfaces of the first frame 100 and the second frame 200 . The flexible frame 510 is formed in a curved surface so that its shape can be changed with a small stress. The flexible frame 510 may be made of a material such as thermo plastic polyurethane (TPU) or nitrile-butadiene rubber (NBR).

As shown in FIG. 2 , the first magnetic material includes a first permanent magnet 310 having a bar shape extending in the second direction, and a pair of first permanent magnets coupled to upper and lower ends of the first permanent magnet 310 , respectively. It may include a yoke 320 . The magnetic polarization direction of the first permanent magnet 310 may be the first direction. The first yoke 320 is a plate having a plane perpendicular to the first direction and may have a shape extending in the second direction.

As shown in FIG. 2 , the second magnetic material includes a second permanent magnet 410 in the shape of a bar extending in the second direction, and a pair of second permanent magnets coupled to upper and lower ends of the second permanent magnet 410 , respectively. It may include a yoke 420 . The magnetic polarization direction of the second permanent magnet 410 may be the first direction, and may be opposite to the magnetic polarization direction of the first permanent magnet 310 . The second yoke 420 is a plate having a plane perpendicular to the first direction and may have a shape extending in the second direction. For example, when the magnetic polarization direction of the first permanent magnet 310 is formed such that the N pole is the upper S pole and the lower side, the magnetic polarization direction of the second permanent magnet 410 is the S pole and the upper N pole is the lower side It can be formed to face.

Accordingly, magnetic fields may be formed in the third direction at upper and lower portions of the first magnetic unit 300 and the second magnetic unit 400 .

The coil substrate 600 may have a plane perpendicular to the third direction and may be formed in a shape extending in the second direction. An upper end of the coil substrate 600 may be coupled to the diaphragm 500 , and a lower end of the coil substrate 600 may be coupled to a flexible support unit 700 to be described later. The coil substrate 600 may be positioned between the first magnetic force part 300 and the second magnetic force part 400 in a non-contact state with the first magnetic force part 300 and the second magnetic force part 400 . Specifically, in the third direction, the first magnetic force unit 300 , the coil substrate 600 , and the second magnetic force unit 400 may be arranged in this order. The length of the coil substrate 600 in the first direction is longer than the lengths of the first magnetic force part 300 and the second magnetic force part 400 in the first direction, and the upper end of the coil substrate 600 is the first magnetic force part. 300 and the second magnetic force part 400 protrude upward more than the upper ends, and the lower end of the coil substrate 600 protrudes further downward than the lower ends of the first magnetic force part 300 and the second magnetic force part 400 . can be A coil formed of wiring including a straight section extending in the second direction may be formed on the coil substrate 600 .

As shown in FIG. 3 , a first seating groove 110 in which the first magnetic force part 300 is inserted and seated is formed on the upper surface or the lower surface of the first frame 100 in the first direction, , a second seating groove 210 in which the second magnetic force part 400 is inserted and seated in the first direction may be formed on an upper surface or a lower surface of the second frame 200 . For example, the first seating groove 110 and the second seating groove 210 are formed on the upper surfaces of the first frame 100 and the second frame 200, respectively, and the first magnetic force part 300 and the second seating groove 210 are respectively formed. The second magnetic unit 400 may be inserted into the first and

second seating grooves

110 and 210 respectively on the upper sides of the first frame 100 and the second frame 200 .

The first seating groove 110 may be formed as a long groove extending in the second direction. Specifically, the cross-sectional shape of the first seating groove 110 perpendicular to the first direction may be formed to correspond to the cross-sectional shape of the first magnetic force unit 300 perpendicular to the first direction.

The second seating groove 210 may also be formed as a long groove extending in the second direction. Specifically, the cross-sectional shape of the second seating groove 210 perpendicular to the first direction may be formed to correspond to the cross-sectional shape of the second magnetic force unit 400 perpendicular to the first direction.

3 and 4 , a first assembly hole 111 is formed on the bottom or ceiling surface of the first seating groove 110 , and on the bottom or ceiling surface of the second seating groove 210 . The second assembly hole 211 may be formed. For example, when the first seating groove 110 is formed on the upper surface of the first frame 100 , the first assembly hole 111 penetrating the bottom surface of the first seating groove 110 in the vertical direction is formed. can be Similarly, when the second seating groove 210 is formed on the upper surface of the second frame 200 , the second assembly hole 211 penetrating the bottom surface of the second seating groove 210 in the vertical direction may be formed. have.

As shown in FIG. 3 , in the first frame 100 , one surface of the first magnetic force part 300 seated in the first seating groove 110 is exposed to the one surface of the coil substrate 600 . a first opening 120 is formed, and in the second frame 200 , one surface of the second magnetic force part 400 seated in the second seating groove 210 is the other surface of the coil substrate 600 . The second opening 220 to be exposed to may be formed. A portion of one surface of the first magnetic unit 300 may protrude in the third direction so that a portion of the first magnetic unit 300 is inserted into the first opening 120 . Second magnetic unit 400 Also, a portion of one surface of the second magnetic unit 400 may protrude in the third direction so that a portion of the second magnetic unit 400 is inserted into the second opening 220 .

As shown in FIG. 3 , a length of the first seating groove 110 in the second direction is longer than a length of the first opening 120 in the second direction, and the second seating groove ( A length of the second opening 210 in the second direction may be longer than a length of the second opening 220 in the second direction. Accordingly, a part of the first magnetic part 300 and a part of the second magnetic part 400 are inserted into the first opening 120 and the second opening 220, respectively, and the first magnetic part 300 and the second magnetic part 300 are respectively inserted. A strong magnetic field may be formed by minimizing the gap between the magnetic units 400 , and the remaining part of the first magnetic unit 300 not inserted into the first opening 120 and the second opening 220 and the second magnetic force The remaining part of the part 400 may be firmly fixed to the structure of the first frame 100 and the second frame 200 having sufficient thickness.

3 to 5, the first frame 100 is provided with a first coupling means 131 formed on one surface facing the second frame 200, the second frame 200 ) is provided with a second coupling means 231 formed on one surface facing the first frame 100 , and the first frame 100 is provided with the second coupling means 231 on one surface facing the second frame 200 . A third coupling means 132 for coupling with the coupling means 231 is provided, and the second frame 200 is coupled to the first coupling means 131 on one surface facing the first frame 100 The fourth coupling means 232 may be provided.

The first coupling means 131 and the third coupling means 132 are positioned in the second direction with the first seating groove 110 therebetween, and the second coupling means 231 and the fourth coupling means 231 are disposed therebetween. The coupling means 232 may be positioned in the second direction with the second seating groove 210 interposed therebetween.

The first coupling means 131 and the second coupling means 231 may be symmetrical to each other on an axis parallel to the first direction, and the third coupling means 132 and the fourth coupling means 232 are first coupled to each other. It may be a structure that is symmetrical about an axis parallel to the direction and symmetrical to each other.

The first coupling means 131 may be formed in a position facing the fourth coupling means 232 , and the second coupling means 231 may be formed in a position facing the third coupling means 132 . The first coupling means 131 is formed to protrude from one surface of the first frame 100 facing the second frame 200 , and the fourth coupling means 232 is a second coupling means 232 facing the first frame 100 . The frame 200 is formed as a groove on one surface, and the first coupling means 131 is inserted into the fourth coupling means 232 so that the first coupling means 131 and the fourth coupling means 232 can be coupled to each other. have. The second coupling means 231 is formed to protrude from one surface of the second frame 200 facing the first frame 100 , and the third coupling means 132 is a first coupling means 132 facing the second frame 200 . The frame 100 is formed as a groove on one surface, and the second coupling means 231 is inserted into the third coupling means 132 so that the second coupling means 231 and the third coupling means 132 can also be coupled to each other. have.

The first coupling means 131 or the second coupling means 231 may be formed in a structure such as a snap-fit or a hook, and the third coupling means 132 or the fourth coupling means ( 232) may be formed as a hole or a groove.

An adhesive may be applied between the first coupling means 131 and the fourth coupling means 232 or between the second coupling means 231 and the third coupling means 132 to be coupled by bonding.

In another embodiment, the coupling structure between the first coupling means 131 and the fourth coupling means 232 or the simple coupling structure between the second coupling means 231 and the third coupling means 132 is a rivets structure, a spring Spring clips structure, machine screw structure, self tapping screw structure, pin hinge structure, hook and eye hinge structure, living hinge structure, a ball grip hinge structure, a strap hinge structure, a spring clip hinge structure, or a heat sealing hinge structure.

3 and 4 , a plurality of first ventilation holes 140 for ventilation in the first direction are formed in the first frame 100 , and the second ventilation holes 140 are formed in the second frame 200 . A plurality of second ventilation holes 240 for ventilation in one direction may be formed. The first ventilation hole 140 and the second ventilation hole 240 may prevent the vibration plate 500 from being disturbed by the air inside the assembly. Specifically, the first ventilation hole 140 may be formed to penetrate the first frame 100 in the first direction, and the second ventilation hole 240 may be formed to penetrate the second frame 200 in the first direction. have.

As shown in FIG. 6 , the diaphragm 500 includes the first seating groove 110 , the second seating groove 210 , the first ventilation hole 140 , and the second ventilation hole 240 . It may be coupled to upper surfaces of the first frame 100 and the second frame 200 through the flexible frame 510 so as to cover it. With such a structure, the first vent hole 140 and the second vent hole 240 are configured to allow the air between the first frame 100 and the second frame 200 and the diaphragm 500 to be ventilated with external air. can

In the linear speaker of the present invention, a lower end of the coil substrate 600 is coupled, and one end in the third direction is coupled to a lower surface of the first frame 100, and the third The other end in the direction may further include a flexible support part 700 coupled to the lower surface of the second frame 200 . The flexible support unit 700 may prevent the coil substrate 600 from being tilted or deviated from its original position.

The flexible support part 700 may have a plurality of wrinkles extending in the second direction. The wrinkles formed in the flexible support 700 may prevent the flexible support 700 from interfering with the motion of the coil substrate 600 .

As shown in FIG. 7 , the flexible support part 700 includes the first frame 100 and the second frame 200 so as not to cover the first ventilation hole 140 and the second ventilation hole 240 . It may be coupled to the lower surface of the. Specifically, the flexible support unit 700 may be formed in a rectangular shape having a surface perpendicular to the first direction, and two corners parallel to the second direction in the flexible support unit 700 are the bottom surfaces of the first frame 100 , respectively. And it may be attached to the bottom surface of the second frame (200).

7 , a pair of first electrode grooves 150 are formed on the bottom surface of the first frame 100 , and a pair of second electrode grooves 250 are formed on the bottom surface of the second frame 200 . can be The first electrode groove 150 is located at an end of the first frame 100 facing the second frame 200 in the third direction, and the second electrode groove 250 is formed in the first frame 100 in the third direction. ) may be formed at an end of the second frame 200 facing the first electrode groove 150 and at the same time facing the first electrode groove 150 . Accordingly, the first electrode groove 150 and the second electrode groove 250 may be combined to form one groove. That is, one electrode 800 may be simultaneously inserted into the first electrode groove 150 and the second electrode groove 250 .

The pair of electrodes 800 inserted into the pair of first electrode grooves 150 and the second electrode grooves 250 may be electrically connected to the coil formed on the coil substrate 600 by a conductive wire 900 .

Hereinafter, a method of assembling a linear speaker for assembling the linear speaker of the present invention will be described.

A method of assembling a linear speaker of the present invention,

inserting the first magnetic part into the first seating groove, and inserting the second magnetic part into the second seating groove;

combining the first frame and the second frame;

inserting the coil substrate, the upper end of which is coupled to the diaphragm, between the first magnetic force unit and the second magnetic force unit;

coupling the diaphragm to upper surfaces of the first frame and the second frame through the flexible frame;

attaching the flexible support to the lower end of the coil substrate;

coupling the flexible support to the lower surfaces of the first frame and the second frame;

inserting an electrode into the first electrode groove and the second electrode groove; and

It may include connecting the electrode and the coil substrate with a energized wire.

Although the embodiments according to the present invention have been described above, these are merely exemplary, and those of ordinary skill in the art will understand that various modifications and equivalent ranges of embodiments are possible therefrom. Accordingly, the true technical protection scope of the present invention should be defined by the following claims.

[Explanation of code]

100...First frame 110...First seating groove

111...First assembly hole 120...First opening

131...first coupling means 132...third coupling means

140...First ventilation hole 150...First electrode groove

200...Second frame 210...Second seating groove

211...Second assembly hole 220...Second opening

231...Second engaging means 232...Fourth engaging means

240...Second ventilation hole 250...First electrode groove

300... First magnetic part 310... First permanent magnet

320...first yoke 400...second magnetic part

410...Second permanent magnet 420...Second yoke

500...diaphragm 510...flexible frame

600...coil board 700...flexible support

800...electrode 900...carrying wire

Claims

a diaphragm vibrating in a first direction that is an up-down direction and extending in a second direction perpendicular to the first direction;

a coil substrate having an upper end coupled to a lower surface of the diaphragm and extending in the second direction;

a first magnetic force unit spaced apart from one side of the coil substrate by a predetermined distance in a third direction perpendicular to the first direction and the second direction;

a second magnetic force unit spaced apart from the other side of the coil substrate by a predetermined distance in the third direction;

a first frame to which the first magnetic unit is fixed; and

and a second frame to which the second magnetic force part is fixed and coupled to the first frame with the coil substrate interposed therebetween.
According to claim 1,

A first seating groove is formed in an upper surface or a lower surface of the first frame to be seated by inserting the first magnetic force part in the first direction,

A second seating groove is formed in an upper surface or a lower surface of the second frame in which the second magnetic force part is inserted and seated in the first direction.
3. The method of claim 2,

A first assembly hole is formed in the bottom surface or the ceiling surface of the first seating groove,

A linear speaker in which a second assembly hole is formed on a bottom surface or a ceiling surface of the second seating groove.
3. The method of claim 2,

A first opening is formed in the first frame so that one surface of the first magnetic force part seated in the first seating groove is exposed to the one surface of the coil substrate;

wherein a second opening is formed in the second frame so that one surface of the second magnetic force part seated in the second seating groove is exposed to the other surface of the coil substrate.
5. The method of claim 4,

A length of the first seating groove in the second direction is longer than a length of the first opening in the second direction,

A length of the second seating groove in the second direction is longer than a length of the second opening in the second direction.
3. The method of claim 2,

The first frame is provided with a first coupling means formed on one surface facing the second frame,

The second frame is provided with a second coupling means formed on one surface facing the first frame,

The first frame is provided with a third coupling means coupled to the second coupling means on one surface facing the second frame,

The second frame has a linear speaker provided with a fourth coupling means coupled to the first coupling means on one surface facing the first frame.
7. The method of claim 6,

The first coupling means and the third coupling means are positioned in the second direction with the first seating groove therebetween,

The second coupling means and the fourth coupling means are positioned in the second direction with the second seating groove therebetween.
3. The method of claim 2,

A plurality of first ventilation holes for ventilation in the first direction are formed in the first frame,

A plurality of second ventilation holes for ventilation in the first direction are formed in the second frame.
9. The method of claim 8,

The diaphragm is coupled to upper surfaces of the first frame and the second frame through the flexible frame to cover the first seating groove, the second seating groove, the first ventilation hole, and the second ventilation hole. linear speaker.
10. The method of claim 9,

A lower end of the coil substrate is coupled, extended in the second direction, one end in the third direction is coupled to the lower surface of the first frame, and the other end in the third direction is the lower surface of the second frame. The linear speaker further comprising a flexible support coupled to the.
11. The method of claim 10,

The flexible support portion is a linear speaker having a plurality of pleats extending in the second direction.
11. The method of claim 10,

and the flexible support part is coupled to lower surfaces of the first frame and the second frame so as not to cover the first and second ventilation holes.