KR20110002370A - Micro speaker with dual suspension - Google Patents

Micro speaker with dual suspension Download PDF

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Publication number
KR20110002370A
KR20110002370A KR1020090059939A KR20090059939A KR20110002370A KR 20110002370 A KR20110002370 A KR 20110002370A KR 1020090059939 A KR1020090059939 A KR 1020090059939A KR 20090059939 A KR20090059939 A KR 20090059939A KR 20110002370 A KR20110002370 A KR 20110002370A
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KR
South Korea
Prior art keywords
suspension
diaphragm
plate
shaped
voice coil
Prior art date
Application number
KR1020090059939A
Other languages
Korean (ko)
Inventor
동 현 서
Original Assignee
부전전자 주식회사
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Publication date
Application filed by 부전전자 주식회사 filed Critical 부전전자 주식회사
Priority to KR1020090059939A priority Critical patent/KR20110002370A/en
Publication of KR20110002370A publication Critical patent/KR20110002370A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
    • H04R7/20—Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/045—Mounting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/046—Construction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/207—Shape aspects of the outer suspension of loudspeaker diaphragms

Abstract

PURPOSE: A dual suspension micro speaker is provided to position a second suspension in a voice coil by using a support protrusion installed on the lower side of the second suspension. CONSTITUTION: A microspeaker(1) comprises a yoke(2), a permanent magnet(3), a plate(4), a vibration plate integrated with a first suspension, a voice coil(7), a frame(8), and a protector(9). A second suspension(6,20) is made of materials with high restoring force. The second suspension is installed on the lower side of the vibration plate. A support protrusion(10) is positioned on the lower side of the second suspension and is protrusively installed on the plate. The second suspension is fixed to the upper side of the support protrusion. The second suspension is positioned in the voice coil.

Description

Dual suspension micro speaker {Micro speaker with dual suspension}

The present invention relates to a micro speaker used for the purpose of sound reproduction of small electronic devices such as mobile phones, notebook computers, LCD TVs, LED TVs, and more particularly, in the lower portion of the diaphragm formed integrally with the first suspension (edge) The present invention relates to a dual suspension micro speaker which is provided with a second suspension made of a material having excellent restoring force, and which fixes the second suspension to an upper surface of the support protrusion installed below the second suspension.

Speakers are used in various fields as voice devices for outputting electrical and electronically received acoustic signals as sounds.

Micro speaker refers to a thin speaker and is mainly used in mobile communication terminals or small electronic devices such as mobile phones, notebook computers, LCD TVs, LED TVs. As multimedia functions are installed in such mobile communication terminals or small electronic devices, micro speakers are required to have high power and wideband reproduction similar to those of general speakers.

In general, when a micro speaker has a current signal including several frequencies applied to a voice coil, the voice coil generates mechanical energy according to the strength of the current and the magnitude of the frequency, and a diaphragm attached to the voice coil. Vibration is generated at the end to generate a sound pressure of a predetermined magnitude that is ultimately recognizable to the human ear.

That is, the magnetic circuit of the micro speaker has a low speed magnetic flux connected at right angles to the voice coil existing in the air gap formed by using a magnet and an upper plate in a metal yoke. The voice coil is bonded to the diaphragm to generate electromotive force up and down by the input signal, and vibrates the diaphragm bound to the frame up and down to generate sound pressure.

Conventional micro-speakers are integrally provided with a first suspension (also called an edge) at the edge of the diaphragm. This suspension serves as a braking function to limit the vibration of the diaphragm. For example, the first suspension prevents the amplitude of the diaphragm from becoming excessively large due to excessive input signals, and buffers the vibration of the diaphragm to improve bass characteristics.

However, there is a limitation that only one suspension installed in the diaphragm cannot sufficiently brake the vibration of the diaphragm. Therefore, the greater the electric energy input, the weaker the braking force of the suspension is, the vibration occurs with the abnormal sound over the entire portion of the diaphragm, and the expansion into the low range becomes difficult, making it difficult to reproduce broadband.

In order to solve this problem, Korean Patent Application No. 2002-51911 discloses a dual suspension dynamic micro speaker that installs a second suspension separately from the first suspension.

The conventional dual suspension dynamic micro speaker has a second suspension spaced apart from the bottom of the first suspension. In this case, the planar shape of the second suspension is similar to the first suspension and is fixed to the inner circumferential surface of the frame like the first suspension. Such a conventional micro speaker enables a high power and wideband reproduction since the first suspension and the second suspension perform a braking function together.

However, in the conventional dual suspension dynamic micro speaker, since both the first suspension and the second suspension are fixed to the inner circumference of the frame, the size and shape of the second suspension are constrained by the size and shape of the frame and the first suspension.

In the conventional dual suspension dynamic micro speaker, when the size of the frame is large or the shape is complicated, the size and shape of the first and second suspensions are also increased and complicated, thereby limiting their application to various products.

The present invention is to solve the problem according to the prior art, the main object of the present invention is to install a second suspension made of a material having excellent resilience to the lower portion of the diaphragm formed integrally with the first suspension (edge), the second suspension It is to provide a dual suspension micro-speaker that can be designed in various shapes and sizes without restraining the size and shape of the second suspension by fixing to the upper surface of the support protrusion installed on the lower portion.

As a means for achieving the above object, the dual suspension micro speaker according to the present invention, a yoke, a permanent magnet, a plate, a diaphragm having a primary suspension integrated, a voice coil, a micro frame having a protector In the speaker,

A second suspension formed at a lower portion of the diaphragm and made of a material having excellent restoring force, and a support protrusion disposed at the lower portion of the second suspension and protruding onto the plate; The second suspension is fixed to the upper surface of the support protrusions, characterized in that located inside the voice coil.

In the present invention, the support protrusion is formed to protrude in the middle of the upper surface of the plate or yoke, or is formed to protrude on the inner surface of the frame on which the plate or yoke is seated.

The second suspension may include a diaphragm attachment portion corresponding to a plane shape of an interface between the diaphragm and the first suspension; A fixing part corresponding to the support protrusion; It comprises a connecting portion consisting of a plurality of elastic pieces connecting the diaphragm attachment portion and the fixing portion.

In addition, a vertical portion having a predetermined height is integrally formed between the diaphragm attaching portion and the connecting portion to prevent the diaphragm from hitting the diaphragm when the second suspension vibrates.

Preferably, the lead wire of the voice coil may be connected to a flexible substrate attached to the bottom surface of the second suspension to be electrically connected to a connection terminal provided outside the frame.

The dual suspension micro speaker according to the present invention can be applied to both a micro speaker having one yoke, a permanent magnet and a plate, and a micro speaker having two yokes, a permanent magnet and a plate.

In addition, the dual suspension micro speaker according to the present invention is a micro speaker having a circular yoke and a permanent magnet and a plate, a micro speaker having a track-shaped yoke and a permanent magnet and a plate, and a track-shaped diaphragm, voice coil and a frame. All can be applied to a micro speaker having a.

In the dual suspension micro speaker of the present invention, the second suspension is installed on the lower part of the diaphragm, but the second suspension is positioned inside the voice coil by using the support protrusion provided on the lower part of the frame or the first suspension. There is an effect that can be designed in various ways without being constrained.

The present invention also has the effect of reducing the size of the second suspension, simplifying the structure and exerting a braking force more efficiently by fixing the second suspension to the support protrusion provided in the center of the diaphragm.

Hereinafter, exemplary embodiments of a dual suspension micro speaker according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view showing a first embodiment of a dual suspension micro speaker according to the present invention, Figure 2 is a plan view showing a second suspension applied to the first embodiment.

As shown, the dual suspension micro speaker 1 according to the present invention comprises a yoke 2, a permanent magnet 3, a plate 4, a diaphragm 5, a voice coil 7, It comprises a frame 8 and a protector 9.

The dual suspension micro speaker 1 of this embodiment is provided with two suspensions 6 and 20. As shown in FIG. The first suspension 6 is integrally formed around the diaphragm 5. The first suspension 6 is provided outside of the diaphragm 5. The planar shape of the first suspension 6 is ring-shaped or track-shaped.

The second suspension 20 is located below the diaphragm 5. The second suspension 20 is located inside the voice coil 7. As shown in FIG. 2, the second suspension 20 is a leaf spring made of a spring material having excellent restoring force.

In the dual suspension micro speaker 1 of the present embodiment, the first suspension 6 is fixed to the stepped portion 35 formed on the inner circumferential surface of the frame 8. On the other hand, the second suspension 20 is fixed to the upper surface of the support protrusion 10 provided in the lower portion of the second suspension 20. At this time, the upper surface of the support protrusion 10 is located below the stepped portion 35 and spaced apart from each other by a predetermined distance.

The support protrusion 10 is formed to protrude on the upper surface of the plate (4). Accordingly, the second suspension 20 is located between the diaphragm 5 and the support protrusion 10. The diaphragm 5 is located above the second suspension 20, and the voice coil 7 is located below the suspension 20.

The second suspension 20 includes a diaphragm attachment part 22 to which the diaphragm 5 is attached and a fixing part 24 to which the support protrusion 10 is fixed. The diaphragm attaching part 22 has a shape corresponding to the planar shape of the boundary surface or the overlapping portion 5a or 6a (hereinafter referred to as the boundary surface) of the diaphragm 5 and the first suspension 6. The fixing part 24 is formed in a shape that can contact the upper surface of the support protrusion (10). As shown, the diaphragm attaching part 22 is formed in a ring shape, and the fixing part 24 is formed in a plate shape.

The second suspension 20 further includes a connection portion 26 for integrally connecting the ring-shaped diaphragm attachment portion 22 and the disc-shaped fixing portion 24. The connection part 26 is composed of a plurality of spiral elastic pieces connecting the diaphragm attachment part 22 and the fixing part 24. The plurality of elastic pieces allow the ring-shaped diaphragm attachment portion 22 to vibrate up and down while being generally balanced. The elastic piece is made of a narrow plate with a narrow width to impart an elastic force.

In addition, the second suspension 20 is further provided with a vertical portion 28 between the diaphragm attachment portion 22 and the connection portion 26. The vertical portion 28 has a gap formed between an upper surface of the second suspension 20 and a bottom surface of the diaphragm 5 so that the vertical portion 28 collides with the diaphragm 5 during vertical vibration of the second suspension 20 to generate an abnormal sound. To prevent this from happening. As shown, the vertical portion 28 is cylindrical.

The voice coil 7 is wound around the outer circumferential surface of the cylindrical bobbin 17, and the cylindrical bobbin 17 is attached to the bottom surface of the second suspension 20. Preferably, the upper end of the cylindrical bobbin 17 is attached to the bottom surface of the diaphragm attachment portion 22 of the second suspension 20 or to the outer circumferential surface of the vertical portion 28. The lead wire of the voice coil 7 is electrically connected to a connection terminal provided on one side of the frame 8.

Therefore, when an electrical signal is applied to the voice coil 7, the voice coil 7 generates mechanical energy according to the strength of the current and the magnitude of the frequency, and vibrates on the diaphragm 5 attached to the voice coil 7. To generate sound. At this time, the first suspension 6 and the second suspension 20 to limit the vibration or amplitude of the diaphragm 5 within a predetermined range to prevent abnormal sounds due to excessive vibration, and to prevent the vibration of the diaphragm 5 It buffers to improve bass characteristics.

3 is a cross-sectional view showing a second embodiment of a dual suspension micro speaker according to the present invention. The dual suspension micro speaker 50 according to the present exemplary embodiment has the same structure as the first exemplary embodiment except that the support protrusion 80 to which the second suspension 60 is fixed is installed at the bottom of the cylindrical yoke. Accordingly, detailed description of parts having the same functions as those of the first embodiment will be omitted.

As shown, the support protrusion 80 is integrally formed at the center of the inner surface of the yoke 52. The permanent magnet 53 and the plate 54 is formed with a through hole 11 through which the support protrusion 80 passes. The upper end of the support protrusion 80 passes through the permanent magnet 53 and the through hole 11 of the plate 54 and protrudes a predetermined height above the upper surface of the plate 54.

The diaphragm attaching portion 62 of the second suspension 60 is formed in a ring shape corresponding to a planar shape of an interface between the diaphragm 55 and the first suspension 56, and the fixing portion 64 is formed in the ring 64. It consists of a plate shape corresponding to the upper surface of the support protrusion (80). In addition, a connection portion 66 formed of a plurality of elastic pieces is further formed between the ring diaphragm attachment portion 62 and the plate-shaped fixing portion 64.

Therefore, the second suspension 60 is located between the diaphragm 55 and the support protrusion 80, and the boundary surface of the diaphragm 55 is attached to the upper surface of the diaphragm attachment part 62, and the An upper end is attached to the bottom of the diaphragm attachment part 62, and an upper surface of the support protrusion 80 is fixed to the bottom of the fixing part 24.

4 is a perspective view showing a third embodiment of the dual suspension micro speaker according to the present invention, and FIGS. 5 and 6 are cross-sectional views and exploded perspective views showing the dual suspension micro speaker shown in FIG.

As illustrated, the dual suspension micro speaker 100 according to the present embodiment includes a track-shaped yoke 102 having a long axis and a short axis, a permanent magnet 103, a plate 104, a diaphragm 105, and the like. And a voice coil 107 and a frame 108 and a protector 109 accommodating the voice coil 107.

Sound emission outlets 133 and 134 are formed in the frame 108 and the protector 109, and a terminal portion 139 in which the connection terminal 143 is installed is provided at one side of the frame 108. As shown, in the present embodiment, the terminal portion 139 is formed on the bottom of the frame 108, and the through hole 137 through which the leader line (or the lead portion) is formed in the frame 108 is formed. do.

The dual suspension micro speaker 100 of the present embodiment is provided with two suspensions. The first suspension 106 is integrally formed around the diaphragm 105. The planar shape of the first suspension 106 is a track shape. The second suspension 120 is located below the diaphragm 105. The second suspension 120 is installed inside the voice coil 107. The second suspension 20 is a leaf spring made of a spring material with excellent restoring force.

The first suspension 106 is fixed to the stepped portion 135 formed on the inner circumferential surface of the frame 108. On the other hand, the second suspension 120 is fixed to the upper surface of the support protrusion 110 provided in the lower portion of the second suspension 120. The support protrusion 110 is formed to protrude from the center of the upper surface of the plate 104. Preferably, the support protrusion 110 is made of a hollow structure by drawing the plate 104. In addition, a plurality of alignment pins 112 are integrally formed on the upper surface of the support protrusion 110.

The second suspension 120 is located between the diaphragm 105 and the support protrusion 110. The diaphragm 105 is attached to the top surface of the second suspension 120, and the voice coil 107 is attached to the bottom surface of the second suspension 120.

The diaphragm attachment part 122 to which the diaphragm 105 is attached has a track shape corresponding to the plane shape of the boundary surface 105a of the diaphragm 105 and the first suspension 106. The voice coil 107 is attached to the bottom surface of the diaphragm attachment portion 122.

In addition, the fixing part 124 of the second suspension 120 is formed in a plate shape corresponding to the planar shape of the support protrusion 110, the plate-shaped fixing part 124 is formed on the upper surface of the support protrusion 110. An alignment hole 123 through which the alignment pin 112 is formed is formed.

In addition, the second suspension 120 includes a connecting portion 126 connecting the track-shaped diaphragm attachment portion 122 and the plate-shaped fixing portion 124. The connection part 126 is composed of a plurality of elastic pieces connecting the diaphragm attachment part 122 and the fixing part 124. The plurality of elastic pieces are installed in the longitudinal direction across the interior of the track-type diaphragm attachment portion 122. In addition, both ends of the elastic piece are bent to the outside and connected to the diaphragm attachment part 122.

The diaphragm 105 is attached to an upper surface of the diaphragm attaching portion 122 of the second suspension 120, and the voice coil 107 is attached to a lower surface of the diaphragm attaching portion 122 of the second suspension 120. Attached. The fixing part 124 of the second suspension 120 is attached to an upper surface of the support protrusion 110.

The lead wire of the voice coil 107 is connected to the flexible substrate 140 attached to the bottom surface of the second suspension 120. At this time, the voice coil 107 is wound on the outer peripheral surface of the track-shaped bobbin 117 having a long axis and a short axis.

The flexible substrate 140 includes a suspension attachment portion 142 corresponding to a planar shape of the diaphragm attachment portion 122 of the second suspension 120, and a connection terminal 143 provided outside the frame 108. And a lead portion 145 connecting the track-type suspension attachment portion 142. The lead portion 145 includes two lead pieces connected to two connection terminals 143, respectively. The drawing piece is a thin and thin plate, and a conductive wire is printed on the bottom thereof.

As shown, the suspension attachment portion 142 of the flexible substrate 140 has the same shape as the diaphragm attachment portion 122 of the second suspension 120. Accordingly, the suspension attachment portion 142 of the flexible substrate 140 is attached to the bottom surface of the diaphragm attachment portion 122 of the second suspension 120 and vibrates up and down together with the second suspension 120.

The upper end of the bobbin 117 of the voice coil 107 is attached to the bottom surface of the diaphragm attachment part 122 of the second suspension 120. Two lead wires of the voice coil 107 are electrically connected to the connection terminal 143 by being connected to a conductive wire formed on the upper surface of the flexible substrate 140.

Next, FIG. 7 is a perspective view showing a fourth embodiment of the dual suspension micro speaker according to the present invention, and FIGS. 8 and 9 are cross-sectional views and exploded perspective views of the dual suspension micro speaker shown in FIG. 7.

As shown, the dual suspension micro speaker 150 according to the present embodiment, the yoke 152 of the channel form, the rectangular permanent magnet 153 and the plate 154 seated on the upper surface of the yoke 152 And a diaphragm 155 and a voice coil 157 having a long axis and a short axis, and a frame 158 accommodating the diaphragm 157.

The dual suspension micro speaker 150 of the present embodiment has two suspensions. The first suspension 156 is integrally formed around the diaphragm 155. The planar shape of the first suspension 156 is a track shape. The second suspension 160 is located below the diaphragm 155. The second suspension 160 is installed inside the voice coil 157. The second suspension 160 is a leaf spring made of a spring material having excellent restoring force.

The first suspension 156 is fixed to the stepped portion 135 formed on the inner circumferential surface of the frame 158. On the other hand, the second suspension 160 is fixed to the upper surface of the support protrusion 180 provided in the lower portion of the second suspension 160. The support protrusion 180 protrudes from the center of the upper surface of the plate 154.

The second suspension 160 is located between the first suspension 156 and the support protrusion 180. The top surface of the second suspension 160 is attached to the bottom surface of the first suspension 156, and the bottom surface of the second suspension 160 is attached to the top surface of the support protrusion 180. The voice coil 157 is attached to the bottom surface of the first suspension 156.

The second suspension 160 includes a diaphragm attachment part 162 to which the diaphragm 155 is attached, and a fixing part 164 to which the support protrusion 180 is attached. The diaphragm attaching portion 162 has a track shape corresponding to the planar shape of the boundary surface 156a of the diaphragm 155 and the first suspension 156. The fixing part 164 of the second suspension 160 is formed in a plate shape corresponding to the planar shape of the support protrusion 180.

In addition, the second suspension 160 includes a connecting portion 166 connecting the track-shaped diaphragm attachment portion 162 and the plate-shaped fixing portion 164. The connection part 166 is composed of a plurality of curved elastic pieces connecting the diaphragm attachment part 162 and the fixing part 164.

In addition, a vertical portion 168 is further provided between the diaphragm attachment portion 162 and the connection portion 166. The vertical portion 168 is a track-shaped cylinder, and forms a sufficient distance between the upper surface of the second suspension 160 and the bottom surface of the first suspension 156 or the diaphragm 155, so that the second suspension 160 is Do not collide during vertical vibration.

The voice coil 157 includes a track-shaped bobbin 177 having a long axis and a short axis. The track-shaped bobbin 177 is attached to the bottom of the diaphragm attaching portion 162 or to the vertical portion 168.

10 and 11 are cross-sectional views and exploded perspective views showing a fifth embodiment of the dual suspension micro speaker according to the present invention.

As shown, the dual suspension micro speaker 200 according to the present embodiment includes two cylindrical yokes 202, a permanent magnet 203, a plate 204, a voice coil 207, and one The track-type diaphragm 205 and the frame 208 are provided.

A sound discharge port 233 is formed in the frame 208, and a terminal portion in which a connection terminal is installed is formed at one side of the frame 208. As shown in the drawing, two through holes 237 through which the lead portion 245 penetrates are formed at one side of the frame 208. In addition, two cylindrical seating portions 231 for installing two cylindrical yokes 202 are formed on the inner surface of the frame 208 at a predetermined distance from each other.

The dual suspension micro speaker 200 of the present embodiment is provided with two suspensions. The first suspension 206 is integrally formed around the diaphragm 205. The first suspension 206 is in track shape. The second suspension 220 is located below the diaphragm 205. The second suspension 220 is a leaf spring made of a spring material with excellent restoring force.

The first suspension 206 is fixed to the stepped portion 235 formed on the inner circumferential surface of the frame 208. On the other hand, the second suspension 220 is fixed to the upper surface of the two support protrusions 210 provided in the lower portion of the second suspension 220. In this embodiment, the support protrusion 210 is formed on the upper surface of the plate 204.

The secondary suspension 220 is located between the diaphragm 205 (or the first suspension) and the support protrusion 210. The upper surface of the second suspension 220 is attached to the bottom surface of the diaphragm 205 (or the first suspension 206), and the bottom surface of the second suspension 220 is attached to the upper surface of the support protrusion 210. . In addition, two voice coils 207 are attached to the bottom surface of the second suspension 220.

The second suspension 220 may include a diaphragm attachment part 222 to which the diaphragm 205 (or the first suspension) is attached, and two fixing parts 224 to which the two support protrusions 210 are attached. And a coil attachment portion 223 to which the two voice coils 207 are attached.

The diaphragm attachment part 222 consists of a track-shaped elastic piece corresponding to the planar shape of the boundary surface 206a of the diaphragm 205 and the first suspension 206. On the other hand, the coil attachment portion 223 to which the voice coil 207 is attached is formed of a ring-shaped elastic piece corresponding to the plane shape of the voice coil 207. The two coil attachment parts 223 are integrally formed with a predetermined distance on the diaphragm attachment part 222.

The fixing part 224 of the second suspension 220 is made of a plate-shaped elastic piece corresponding to the planar shape of the support protrusion 210, and the two fixing parts 224 are the center of the coil attachment part 223. Located in

The second suspension 220 includes a connection part 226 for connecting the coil attachment part 223 and the fixing part 224. The connection part 226 is composed of a plurality of helical elastic pieces connecting the coil attachment part 223 and the fixing part 224.

A vertical portion 228 is further provided between the coil attachment portion 223 and the connection portion 226. The vertical portion 228 forms a sufficient gap between the upper surface of the second suspension 220 and the bottom surface of the diaphragm 105 so that the second suspension 220 does not collide with each other during vertical vibration.

Subsequently, the voice coil 207 is wound around the outer circumferential surface of the cylindrical bobbin 217. The cylindrical bobbin 217 is attached to the bottom surface of the coil attachment portion 223 and the outer circumferential surface of the vertical portion 228. The lead wire of the voice coil 207 is connected to the flexible substrate 240 which is coupled to the bottom of the second suspension 220.

The flexible substrate 240 includes two ring-shaped suspension attachment portions 242 corresponding to the planar shape of the cylindrical bobbin 217, two connection terminals 243 and a ring-shaped suspension provided outside the frame 208. It consists of a lead-out portion 245 connecting the attachment portion 242 and the coupling portion 246 for coupling the two suspension attachment portion 242.

At this time, the lead portion 245 is composed of two lead pieces connected to each of the two connection terminals 245, the coupling portion 246 two coupling pieces for coupling the two ring-shaped suspension attachment portion 242 Is done. The drawing piece and the engaging piece are made of a narrow and thin plate to enable vertical vibration, and a conductive wire is printed on the bottom thereof.

As shown, the ring-shaped suspension attachment portion 242 of the flexible substrate 240 has the same shape as the coil attachment portion 223 of the second suspension 220. The coupling portion 246 of the flexible substrate 240 has the same shape as the center portion of the diaphragm attachment portion 222 of the second suspension 220. Therefore, the flexible substrate 240 is attached to the bottom surface of the second suspension 220 and vibrates up and down together.

The suspension attachment portion 242 of the flexible substrate 240 is attached to the coil attachment portion 223 of the second suspension 220. The cylindrical bobbin 217 of the voice coil 207 is connected to the inner circumferential surface of the suspension attachment portion 242. Two lead wires of the voice coil 207 are connected to two conductive wires printed on the bottom surface of the flexible substrate 240, respectively.

12 and 13 are cross-sectional views and exploded perspective views illustrating a sixth embodiment of a dual suspension micro speaker according to the present invention.

As shown, the dual suspension micro-speaker 250 according to the present embodiment, except that the support protrusion 280 to which the second suspension 260 is fixed is installed on the floor 252b of the cylindrical yoke 252. And have the same structure as in the fifth embodiment.

The support protrusion 280 is integrally formed at the center of the inner surface 252b of the yoke 252. The two permanent magnets 253 and the plate 254 are formed with a through hole 211 through which the support protrusion 280 passes. An upper end of the support protrusion 280 passes through the permanent magnet 253 and the through hole 211 of the plate 204, and protrudes a predetermined height to an upper portion of the plate 254.

Therefore, the second suspension 260 is located between the diaphragm 255 and the support protrusion 280, the diaphragm 255 is attached to the upper portion of the second suspension 260, the voice coil 257 is the suspension 260 is attached to the bottom.

Meanwhile, sound emission ports 233 and 234 are formed in the frame 258 and the protector 259, and a terminal portion 239 in which the connection terminal 243 is provided is formed at one side of the frame 258. As shown, the terminal portion 239 is formed at one side of the frame 258, and two through grooves 237 through which the lead portion 245 penetrates are formed at one side of the frame 258.

In addition, two cylindrical seating parts 231 for installing two cylindrical yokes 252 are formed at a predetermined distance from an inner surface of the frame 258. At this time, the two yoke 252 is a cylindrical outer cylinder 252a and a disk-shaped lower plate 252b coupled to the lower end of the outer cylinder 252a, and the ring-shaped plate 252c installed on the upper end of the outer cylinder 252a. )

14 and 15 are a cross-sectional view and an exploded perspective view showing a seventh embodiment of a dual suspension micro speaker according to the present invention.

As shown, the dual suspension micro speaker 300 according to the present embodiment includes two cylindrical yokes 302, a permanent magnet 303, a plate 304, a voice coil 307, a long axis, A track-like diaphragm 305 having a single axis, a frame 308 and a protector 309 are provided.

Sound emission ports 333 and 334 are formed in the frame 308 and the protector 309, and terminal portions 339 in which the connection terminals 343 are installed are formed at one side of the frame 308. As shown, in the present embodiment, the terminal portion 339 is formed on one side of the frame 208, and two through grooves 337 through which the lead portion 345 penetrates are formed on one side of the frame 308. do.

In addition, two cylindrical seating portions 331 for installing two cylindrical yokes 302 are formed at a predetermined distance from the inner surface 332 of the frame 308. At this time, the two yoke 302 is a cylindrical outer cylinder 302a and a disk-shaped lower plate 302b coupled to the lower end of the outer cylinder 302a, and a ring-shaped plate 302c installed on the upper end of the outer cylinder 302a. )

 The dual suspension micro speaker 300 of the present embodiment is provided with two suspensions. The first suspension 306 is integrally formed around the diaphragm 305. The first suspension 306 is in track shape. The second suspension 320 is located below the diaphragm 305. The second suspension 320 is a leaf spring made of a spring material with excellent restoring force.

The first suspension 306 is fixed to the stepped portion 305 formed on the inner circumferential surface of the frame 308. On the other hand, the second suspension 320 is fixed to the upper surface of the support protrusion 310 provided in the lower portion of the second suspension (320).

The support protrusion 310 is integrally formed at the center of the inner surface 332 of the frame 308. The support protrusion 310 is installed on an inner surface 332 between two settled portions 331 for installing the yoke 302. In this case, since the inner surface 332 of the frame 308 is coplanar with the upper surface of the plate 304, the upper surface of the support protrusion 310 protrudes to the upper portion of the plate 304. The alignment pin 311 is integrally formed on the upper surface of the support protrusion 310.

The dual suspension micro speaker 300 is provided with two support protrusions 310. The two support protrusions 310 are installed at a predetermined distance from the inner surface 332 of the frame 308 back and forth so that the second suspension 320 can vibrate up and down while maintaining horizontality.

The secondary suspension 320 is located between the diaphragm 305 and the support protrusion 310. The diaphragm 305 is attached to an upper surface of the second suspension 320, and two voice coils 307 are attached to a lower surface of the second suspension 320.

The diaphragm attaching part 322 to which the diaphragm 305 is attached is formed of a straight line corresponding to the plane shape of the boundary surface 305a of the diaphragm 305 and the first suspension 306. On the other hand, the coil attachment portion 323 to which the voice coil 307 is attached has a ring shape corresponding to the planar shape of the cylindrical voice coil 307. In the present embodiment, the coil attachment portion 323 is integrally installed at both ends of the linear diaphragm attachment portion 322 to attach two voice coils 307, respectively.

In addition, the fixing part 324 of the second suspension 320 is formed in a straight line formed at a position corresponding to the two support protrusions 310 spaced apart from the upper surface of the frame 308, the two support protrusions Alignment holes 312 into which the alignment pins 311 of 310 are inserted are formed, respectively.

On the other hand, the two ring-shaped coil attachment portion 323 of the second suspension 320 is connected by the linear diaphragm attachment portion 322 and the linear fixing portion 324. At this time, the linear fixing portion 324 is composed of two narrow and long elastic pieces are connected to both ends of the ring-shaped coil attachment portion 323 to maximize the elastic force.

Subsequently, the lead wire of the voice coil 307 is connected to the flexible substrate 240 coupled to the bottom surface of the second suspension 320. At this time, the voice coil 307 is wound on the outer circumferential surface of the cylindrical bobbin 317. The flexible substrate 240 is the same as in the above-described embodiment.

As illustrated, the ring-shaped suspension attachment portion 242 of the flexible substrate 240 has the same shape as the coil attachment portion 323 of the second suspension 320, and the coupling portion 246 of the flexible substrate 240. ) Is the same as the diaphragm attachment portion 322 of the second suspension (320). Therefore, the flexible substrate 240 is attached to the bottom surface of the second suspension 320 and vibrates up and down together.

The cylindrical bobbin 317 of the voice coil 307 is fixed to the bottom surface of the suspension attachment portion 242 of the flexible substrate 240. In addition, the two lead lines 307a of the voice coil 307 are connected to the conductive line printed on the bottom surface of the flexible substrate 240.

16 and 17 are cross-sectional views and exploded perspective views illustrating an eighth embodiment of the dual suspension micro speaker according to the present invention.

As shown, in the dual suspension micro speaker 350 according to the present embodiment, the support protrusion 380 to which the second suspension 360 is fixed is integrally formed at both side ends of the inner surface 332 of the frame 358. Is formed. That is, the support protrusion 380 is installed on the inner surface 332 of the outside of the two settlement portion 331 for installing the yoke 352. The support protrusion 380 is spaced apart from the frame 308 by a predetermined distance. In this case, since the inner surface 332 of the frame 358 is coplanar with the upper surface of the plate 354, the upper surface of the support protrusion 380 protrudes upward from the plate 354.

Therefore, the secondary suspension 360 is located between the diaphragm 355 and the support protrusion 380. The diaphragm 355 is attached to the upper surface of the second suspension 360, and two voice coils 357 are attached to the lower surface of the second suspension 360.

The diaphragm attaching portion 362 of the second suspension 260 is formed of a straight line corresponding to the planar shape of the boundary surface 355a of the diaphragm 355 and the first suspension 356. On the other hand, the coil attachment part 363 to which the voice coil 357 is attached has a ring shape corresponding to the planar shape of the cylindrical voice coil 357. In this embodiment, the coil attachment part 363 is integrally installed at both ends of the linear diaphragm attachment part 362 so as to attach two voice coils 357, respectively.

The fixing part 364 of the second suspension 360 is formed at a position corresponding to the two support protrusions 380 spaced apart from both ends of the upper surface of the frame 368. The fixing portion 364 is an arc-shaped elastic piece integrally formed on the outside of the coil attaching portion 363. The fixing part 364 is formed with an alignment hole 382 into which the alignment pin formed on the upper surface of the support protrusion 380 is inserted.

1 is a cross-sectional view showing a first embodiment of a dual suspension micro speaker according to the present invention;

2 is a plan view showing a second suspension applied to the first embodiment,

3 is a perspective view showing a second embodiment of a dual suspension micro speaker according to the present invention;

 4 is a perspective view showing a third embodiment of a dual suspension micro speaker according to the present invention;

FIG. 5 is a cross-sectional view illustrating the dual suspension micro speaker shown in FIG. 4;

FIG. 6 is an exploded perspective view showing the dual suspension micro speaker shown in FIG. 4;

7 is a perspective view showing a fourth embodiment of a dual suspension micro speaker according to the present invention;

FIG. 8 is a cross-sectional view of the dual suspension micro speaker shown in FIG. 7;

9 is an exploded perspective view of the dual suspension micro speaker shown in FIG. 7;

10 and 11 are a cross-sectional view and an exploded perspective view showing a fifth embodiment of a dual suspension micro speaker according to the present invention;

12 and 13 are a cross-sectional view and an exploded perspective view showing a sixth embodiment of a dual suspension micro speaker according to the present invention;

14 and 15 are a cross-sectional view and an exploded perspective view showing a seventh embodiment of a dual suspension micro speaker according to the present invention;

16 and 17 are a cross-sectional view and an exploded perspective view showing an eighth embodiment of a dual suspension micro speaker according to the present invention.

**** Description of the symbols for the main parts of the drawings *****

1, 50, 100, 150, 200, 250, 300, 350: Dual suspension micro speakers

2, 52, 102, 152, 202, 252, 302, 352: York

3, 53, 103, 153, 203, 253, 303, 353: permanent magnet

4, 54, 104, 154, 204, 254, 304, 354: plates

5, 55, 105, 155, 205, 255, 305, 355: Diaphragm

6, 56, 106, 156, 206, 256, 306, 356: first suspension

7, 57, 107, 157, 207, 257, 307, 357: voice coil

8, 58, 108, 158, 208, 258, 308, 358: frames

10, 80, 110, 180, 210, 280, 310, 380: support protrusion

20, 60, 120, 160, 220, 260, 320, 360: second suspension

22, 62, 122, 162, 222, 362, 322, 362: diaphragm attachment

24, 64, 124, 164, 224, 124, 324, 364: fixing part

26, 66, 126, 166, 226: connection

140, 240: flexible substrate

142, 242; Suspension Attachment

223, 323, 363: coil attachment

Claims (17)

In a micro speaker having a yoke, a permanent magnet, a plate, a diaphragm integrating a primary suspension, a voice coil, a frame and a protector, A second suspension formed at a lower portion of the diaphragm and made of a material having excellent restoring force, and a support protrusion disposed at the lower portion of the second suspension and protruding onto the plate; And the second suspension is fixed to an upper surface of the support protrusion and positioned inside the voice coil. The method of claim 1, Dual support micro-speakers, characterized in that the support protrusion is formed to protrude in the middle of the upper surface of the plate or yoke. The method of claim 1, The support suspension is a dual suspension micro speaker, characterized in that formed to protrude on the inner surface of the frame on which the plate or yoke is seated. The method according to any one of claims 1 to 3, The second suspension may include a diaphragm attachment portion corresponding to a plane shape of an interface between the diaphragm and the first suspension; A fixing part corresponding to the support protrusion; Dual suspension micro-speaker comprising a connecting portion consisting of a plurality of elastic pieces connecting the diaphragm attachment portion and the fixing portion. The method of claim 4, wherein Dual suspension micro-speakers, characterized in that between the diaphragm attaching portion and the connecting portion is formed integrally with a vertical portion of a predetermined height to prevent from hitting the diaphragm during the vibration of the second suspension. The method of claim 5, The lead wire of the voice coil is connected to a flexible substrate attached to the bottom surface of the second suspension, the dual suspension micro-speakers, characterized in that electrically connected to the connection terminal provided on the outside of the frame. In a micro speaker having a circular yoke, a permanent magnet, a plate, a diaphragm integrating a primary suspension, a voice coil, and a frame, A second suspension made of a material having excellent restoring force and positioned below the diaphragm, and a support protrusion vertically installed on an upper surface of the yoke and protruding above the upper surface of the plate through a through hole formed in the permanent magnet and the plate; ; The second suspension may include a diaphragm attachment portion corresponding to a planar shape of an interface between the diaphragm and the first suspension, a fixing portion corresponding to the support protrusion, and a plurality of elastic pieces connecting the diaphragm attachment portion and the fixing portion. Consisting of connections made; And the diaphragm is attached to an upper surface of the diaphragm attaching part, the voice coil is attached to a lower surface of the diaphragm attaching part, and the fixing part is fixed to an upper surface of the support protrusion. In a micro speaker having a track-shaped yoke having a long axis and a short axis, a permanent magnet, a plate, a diaphragm, a voice coil, and a frame, A second suspension formed at a lower portion of the diaphragm and made of a material having excellent restoring force, and a support protrusion vertically installed at the center of the track-type plate; The second suspension includes a track-shaped diaphragm attaching portion corresponding to a planar shape of an interface between the diaphragm and the first suspension, a plate-shaped fixing portion corresponding to the support protrusion, and a track-shaped diaphragm-attaching portion and a plate-like shape. It is composed of a connecting portion consisting of a plurality of elastic pieces connecting the fixed portion; And the diaphragm is attached to an upper surface of the track-type diaphragm attaching part, the voice coil is attached to a lower surface of the diaphragm attaching part, and the fixing part is fixed to an upper surface of the support protrusion. The method according to claim 7 or 8, The voice coil is wound around the outer circumferential surface of the track bobbin, the lead wire of the voice coil is connected to a flexible substrate attached to the bottom surface of the second suspension is electrically connected to the connection terminal provided on the outside of the frame Dual suspension micro speakers. The method of claim 9, The flexible substrate may include a track-type suspension attachment portion attached to a bottom surface of the second suspension; A connection terminal provided outside the frame; Dual suspension micro speaker, characterized in that consisting of a lead-out portion consisting of two elastic pieces connecting the track-type suspension attachment portion and the connection terminal. It has two circular yokes, permanent magnets, plates and voice coils, a diaphragm incorporating a track-type primary suspension having a long axis and a short axis, and a track-shaped frame having two seats for accommodating the circular yoke. In the micro speaker, A second suspension made of a material having excellent restoring force and positioned under the diaphragm, and two support protrusions protruding from the upper surface of the plate; The second suspension includes a track-shaped diaphragm attaching portion corresponding to a planar shape of an interface between the diaphragm and the first suspension, and two ring coils formed integrally with the diaphragm attaching portions and corresponding to the two voice coils. A portion comprising two plate-like fixing portions corresponding to the two support protrusions and a plurality of spiral elastic pieces connecting the ring-shaped coil attachment portion and the plate-shaped fixing portion; The diaphragm is attached to the upper surface of the diaphragm attachment portion, the voice coil is attached to the bottom surface of the two ring-shaped coil attachment portion, the two plate-shaped fixing portion is fixed to the upper surface of the two support protrusions micro suspension speaker. It has two circular yokes, permanent magnets, plates and voice coils, a diaphragm incorporating a track-type primary suspension having a long axis and a short axis, and a track-shaped frame having two seats for accommodating the circular yoke. In the micro speaker, A second suspension made of a material having excellent restoring force and positioned below the diaphragm, and two support stones vertically installed in the center of the circular yoke and protruding upward through the through-holes formed in the permanent magnet and the plate. Including wealth; The second suspension includes a track-shaped diaphragm attaching portion corresponding to a planar shape of an interface between the diaphragm and the first suspension, and two ring coils formed integrally with the diaphragm attaching portions and corresponding to the two voice coils. A portion comprising two plate-like fixing portions corresponding to the two support protrusions and a plurality of spiral elastic pieces connecting the ring-shaped coil attachment portion and the plate-shaped fixing portion; The diaphragm is attached to the upper surface of the diaphragm attachment portion, the voice coil is attached to the bottom surface of the two ring-shaped coil attachment portion, the two plate-shaped fixing portion is fixed to the upper surface of the two support protrusions micro suspension speaker. It has two circular yokes, permanent magnets, plates and voice coils, a diaphragm incorporating a track-type primary suspension having a long axis and a short axis, and a track-shaped frame having two seats for accommodating the circular yoke. In the micro speaker, A second suspension formed at a lower portion of the diaphragm and made of a material having excellent restoring force, and two support protrusions vertically installed on an inner surface of the frame; The second suspension is formed integrally with both ends of the straight diaphragm attaching portion formed of two elastic pieces corresponding to the planar shape of the interface between the diaphragm and the first suspension, and the diaphragm attaching portion, and corresponds to the two voice coils. Consisting of two ring-shaped coil attachment portions and two elastic pieces corresponding to the two support protrusions; The diaphragm is attached to the upper surface of the linear diaphragm attachment portion, the voice coil is attached to the bottom surface of the two ring-shaped coil attachment portion, the linear suspension is fixed to the upper surface of the support projections dual suspension micro speaker. The method of claim 13, And the two support protrusions are formed between two seating portions for accommodating the circular yoke. The method of claim 13, Dual suspension micro speakers, characterized in that each of the two support protrusions are formed on the outside of the two seating portion for receiving the circular yoke. The method according to any one of claims 11 and 12 to 13, The voice coil is wound around the outer peripheral surface of the cylindrical bobbin, the lead wire of the voice coil is connected to a flexible substrate attached to the bottom surface of the second suspension is electrically connected to the connection terminal provided on the outside of the frame Suspension micro speaker. The method of claim 16, The flexible substrate, Two ring-shaped suspension attachment portions attached to the second suspension; A coupling part consisting of two elastic pieces connecting the two ring-shaped suspension attachment parts; A connection terminal provided outside the frame; The dual suspension micro speaker, characterized in that consisting of a lead portion consisting of two elastic pieces connecting the ring-shaped suspension attachment portion and the connection terminal.
KR1020090059939A 2009-07-01 2009-07-01 Micro speaker with dual suspension KR20110002370A (en)

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WO2012157888A3 (en) * 2011-05-13 2013-01-17 주식회사 이엠텍 High output micro speaker
WO2014029153A1 (en) * 2012-08-21 2014-02-27 Deng Zhiguo Resonance loudspeaker
EP2725820A1 (en) * 2012-10-29 2014-04-30 Em-tech. Co., Ltd. Vibration module for sound transducer
CN103997707A (en) * 2013-02-15 2014-08-20 易音特电子株式会社 Slim protector and slim microspeaker module having the same
EP2809080A1 (en) * 2013-05-28 2014-12-03 Em-tech. Co., Ltd. Microspeaker with improved soldering structure
EP2811759A1 (en) * 2013-06-03 2014-12-10 Em-tech. Co., Ltd. Slim width microspeaker
KR101481650B1 (en) * 2013-07-22 2015-01-14 주식회사 이엠텍 Microspeaker with improved vibration module
US9473837B2 (en) 2012-10-25 2016-10-18 Em-Tech. Co., Ltd. Sound transducer with ventilation structure
EP2901713A4 (en) * 2012-09-25 2016-10-26 Sung Ju & Solution Co Ltd Speaker frame and speaker having the same
US9712921B2 (en) 2014-08-25 2017-07-18 Apple Inc. High aspect ratio microspeaker having a two-plane suspension
KR20190019455A (en) * 2017-08-17 2019-02-27 주식회사 이엠텍 Microspeaker with structure for preventing partial vibration
US10321235B2 (en) 2016-09-23 2019-06-11 Apple Inc. Transducer having a conductive suspension member
US10555085B2 (en) 2017-06-16 2020-02-04 Apple Inc. High aspect ratio moving coil transducer
KR102061885B1 (en) * 2018-12-31 2020-02-11 아날로그플러스 주식회사 A Support Structure for Vibrator Speaker Unit
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US9025808B2 (en) 2011-05-13 2015-05-05 Em-Tech. Co., Ltd. High-output microspeaker
WO2012157888A3 (en) * 2011-05-13 2013-01-17 주식회사 이엠텍 High output micro speaker
WO2014029153A1 (en) * 2012-08-21 2014-02-27 Deng Zhiguo Resonance loudspeaker
EP2901713A4 (en) * 2012-09-25 2016-10-26 Sung Ju & Solution Co Ltd Speaker frame and speaker having the same
US9473837B2 (en) 2012-10-25 2016-10-18 Em-Tech. Co., Ltd. Sound transducer with ventilation structure
EP2725820A1 (en) * 2012-10-29 2014-04-30 Em-tech. Co., Ltd. Vibration module for sound transducer
CN103796140A (en) * 2012-10-29 2014-05-14 易音特电子株式会社 Vibration module for sound transducer
CN103796140B (en) * 2012-10-29 2017-07-28 易音特电子株式会社 Vibration module for sonic transducer
EP2768237A1 (en) * 2013-02-15 2014-08-20 Em-tech. Co., Ltd. Slim protector and slim microspeaker module having the same
CN103997707A (en) * 2013-02-15 2014-08-20 易音特电子株式会社 Slim protector and slim microspeaker module having the same
EP2809080A1 (en) * 2013-05-28 2014-12-03 Em-tech. Co., Ltd. Microspeaker with improved soldering structure
EP2811759A1 (en) * 2013-06-03 2014-12-10 Em-tech. Co., Ltd. Slim width microspeaker
KR101481650B1 (en) * 2013-07-22 2015-01-14 주식회사 이엠텍 Microspeaker with improved vibration module
US9712921B2 (en) 2014-08-25 2017-07-18 Apple Inc. High aspect ratio microspeaker having a two-plane suspension
US10321235B2 (en) 2016-09-23 2019-06-11 Apple Inc. Transducer having a conductive suspension member
US10911874B2 (en) 2016-09-23 2021-02-02 Apple Inc. Transducer having a conductive suspension member
US10555085B2 (en) 2017-06-16 2020-02-04 Apple Inc. High aspect ratio moving coil transducer
KR20190019455A (en) * 2017-08-17 2019-02-27 주식회사 이엠텍 Microspeaker with structure for preventing partial vibration
KR102061885B1 (en) * 2018-12-31 2020-02-11 아날로그플러스 주식회사 A Support Structure for Vibrator Speaker Unit
KR20200082965A (en) * 2018-12-31 2020-07-08 엘지디스플레이 주식회사 Sound generating apparatus, display apparatus and automotive apparatus including the same
WO2020141870A1 (en) * 2018-12-31 2020-07-09 아날로그플러스 주식회사 Support structure of vibrator speaker unit
US11743654B2 (en) 2018-12-31 2023-08-29 Lg Display Co., Ltd. Sound generating device, display apparatus including the same, and automotive apparatus including the sound generating device

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