FLAT SPEAKER INCLUDING ASYMMETRICAL MAGNETIC BODIES AND BASE FRAME

Abstract

The flat speaker according to an embodiment of the present invention includes a voice coil plate, a diaphragm for generating sound according to vertical vibration of the voice coil plate, a damper contacting a lower end surface of the voice coil plate, and a yoke having a first yoke having a “-” shape in cross section and a second yoke having an “L” shape in cross section and the first and second yokes are disposed to face to each other to form asymmetry.

Claims

1. A flat speaker, comprising: a voice coil plate; a diaphragm which generates sound according to vertical vibration of the voice coil plate; a damper in contact with a lower end surface of the voice coil plate; magnets disposed in parallel on both sides of the voice coil plate; and a yoke, wherein the yoke has a first yoke having a “-” shape in cross section and a second yoke having an “L” shape in cross section and the first and second yokes are disposed to face to each other to form asymmetry.

2. The flat speaker of claim 1, wherein the second yoke further comprises: a base portion in contact with the magnet; and a bent portion which is bent in an orthogonal direction of the base portion, and the bent portion is positioned adjacent to a side surface portion of the voice coil plate.

3. The flat speaker of claim 1, wherein the first yoke further comprises: a magnet fixing part protruding to prevent the magnets from contacting each other due to attraction.

4. The flat speaker of claim 1, further comprising: a base frame supporting the diaphragm and the damper, wherein the base frame further comprises: side through holes penetrated through both sides so that the magnet and the yoke can be inserted into an inner space; and a yoke guide part fixing both ends of the yoke to limit a minimum value of the spacing distance between the magnets inserted into the inner space.

5. The flat speaker of claim 4, wherein the base frame further comprises: at least one insertion holes formed in each of both side surfaces, wherein a jig is fixed through the insertion hole to guide a center of the voice coil plate by the jig.

6. The flat speaker of claim 1, wherein the second yoke further comprises: a base portion in contact with the magnet; and a bent portion which is bent in an orthogonal direction of the base portion, wherein when the second yoke is positioned on an upper surface of the magnet, the bent portion is bent upward, when the second yoke is positioned on a lower surface of the magnet, the bent portion is bent downward.

7. The flat speaker of claim 1, wherein the second yoke further comprises: a base portion in contact with the magnet; and a bent portion which is bent in an orthogonal direction of the base portion, wherein an upper surface or a lower surface of the first yoke and a front end surface of the bent portion are placed on a same horizontal extension line.

8. The flat speaker of claim 1, wherein the first yoke is disposed on an N-pole surface of the magnet, and the second yoke is disposed on a S pole surface of the magnet.

9. The flat speaker of claim 1, wherein the magnets are disposed at different vertical positions with respect to the voice coil plate.

Description

DESCRIPTION OF DRAWINGS

[0027] FIG. 1 is a perspective view of a flat speaker according to an embodiment of the present invention.

[0028] FIG. 2 is an exploded perspective view of a flat speaker according to an embodiment of the present invention.

[0029] FIG. 3 is a plan view (a) of a flat speaker (a diaphragm is not shown), a side view (b) and a cross-sectional view (c) A-A according to an embodiment of the present invention.

[0030] FIG. 4 is a perspective view (a), a side view (b), and a cross-sectional view (c) of a base frame according to an embodiment of the present invention.

[0031] FIG. 5 is a view illustrating (a) the configuration and arrangement of a magnetic circuit according to an embodiment of the present invention, and (b) is a side view of FIG. 5(a).

[0032] FIG. 6 is a perspective view of a yoke according to an embodiment of the present invention.

[0033] FIG. 7 is a reference diagram for explaining a difference between a conventional flat speaker (a) and a flat speaker (b) according to an embodiment of the present invention.

MODE FOR INVENTION

[0034] A detailed description of the present invention, which will be described later, is referred to the accompanying drawings illustrating a specific embodiment in which the present invention may be implemented as an example. These embodiments are described in detail so that those skilled in the art may implement the present invention. It should be understood that various embodiments of the present invention are different from each other, but need not be mutually exclusive. For example, the specific shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the present invention in relation to one embodiment. In addition, it should be understood that the location or arrangement of individual components in each disclosed embodiment may be changed without departing from the spirit and scope of the present invention. Therefore, the detailed description to be described below is not limited in meaning, and the scope of the present invention is limited only by the appended claims as well as all scopes equivalent to those claimed in the claims, if appropriate. In the drawings, similar reference numerals refer to the same or similar functions across several aspects.

[0035] Detailed descriptions of specific embodiments shown in the accompanying drawings are read in connection with the accompanying drawings, and the drawings are considered to be part of the explanation of the entire invention. The mention of direction or orientation is only for convenience of explanation and has no intention of limiting the scope of the present invention in any way.

[0036] Specifically, terms indicating positions such as “down, up, horizontal, vertical, upper, lower, upward, downward, upper portion, and lower portion”, or derivatives thereof (e.g., “horizontally, downwardly, upwardly, etc.) should be understood with reference to both the drawings being described and related descriptions. In particular, since such a relative language is only for convenience of description, it does not require that the apparatus of the present invention be configured or operated in a specific direction.

[0037] In addition, a term representing an interconnection relationship between components such as “mounted, attached, connected, coupled, interconnected” may mean a state in which individual components are directly or indirectly mounted, attached, connected, or coupled, unless otherwise stated.

[0038] When adding reference numerals to the components of the drawings, it should be noted that the same components have the same reference numerals as much as possible even though they are indicated in different drawings. In addition, in describing the present invention, when it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

[0039] FIG. 1 is a perspective view of a flat speaker 100 according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of a flat speaker 100 according to an embodiment of the present invention. FIG. 3 is a plan view (a), a side view (b), and a cross-sectional view (c) A-A of the flat speaker 100 according to an embodiment of the present invention. FIG. 3 illustrates a diaphragm 140 to facilitate identification of the configuration and coupling state of the speaker.

[0040] Referring to FIGS. 1 to 3, a flat speaker 100 according to an embodiment of the present invention may include a voice coil plate 150, a diaphragm 140, a damper 110, magnets 130, a yoke 120, a base frame 160, a lead terminal 210 for fixing the flat speaker 100 to an object and a gasket-shaped fixing member 220.

[0041] The voice coil plate 150 may be vertically erected at the center of the flat speaker 100. A voice coil 151 may be formed on one or both surfaces of the voice coil plate 150 by being wound or pattern-printed in an oval shape.

[0042] The diaphragm 140 is adhered to an upper end surface of the voice coil plate 150. Therefore, the diaphragm 140 may vibrate according to vertical vibration of the voice coil plate 150 to generate sound.

[0043] The diaphragm 140 may include a connection part (also referred to as an edge) connected to the base frame 160. The connection part and the diaphragm 140 may be integrated or separated.

[0044] The damper 110 is bonded to a lower end surface of the voice coil plate 150. The damper 110 may serve to assist the vertical vibration of the voice coil plate 150.

[0045] The damper 110 may be made of a cloth having wrinkles. The outer periphery of the damper 110 may be adhered and fixed to the base frame 160. The damper 110 may have elasticity such that the voice coil plate 150 returns to its original state after vertical vibration.

[0046] The magnets 130 are disposed in parallel on both sides of the voice coil plate 150. The magnet 130 may be a rod-shaped magnet having different polarities vertically.

[0047] FIG. 4 is a perspective view (a), a side view (b), and a cross-sectional view (c) of the base frame 160 according to an embodiment of the present invention. FIG. 5(a) is a diagram illustrating the configuration and arrangement of a magnetic circuit according to an embodiment of the present invention. FIG. 5(b) is a side view of FIG. 5(a). FIG. 6 is a perspective view (lower) of a first yoke 120a and a perspective view (upper) of a second yoke 120b according to an embodiment of the present invention.

[0048] Referring to FIGS. 5 and 6, the yoke 120 includes a first yoke 120a having a “-” shape in cross section and a second yoke 120b having an “L” shape in cross section. The first yoke 120a and the second yoke 120b may be disposed to face each other with respect to the voice coil plate 150 and may be asymmetric.

[0049] The first yoke 120a is disposed on the N-pole or S-pole surface of the magnet 130. The second yoke 120b is disposed on the S-pole or N-pole surface of the magnet 130. The first yokes 120a and the second yokes 120b are disposed such that different polarities face each other.

[0050] Preferably, the first yoke is disposed on the N-pole surface of the magnet. The second yoke is disposed on the S-pole surface of the magnet. The magnetic field starting from the first yoke having a narrow area moves to the second yoke. Accordingly, magnetic field circulation may be efficiently improved.

[0051] To prevent the magnets 130 from contacting each other due to attraction, the first yoke 120a may include a magnet fixing part 122 protruding in the direction of the magnet 130 to limit movement of the magnet 130.

[0052] The magnet fixing part 122 may be formed through half-blanking processing.

[0053] Half blanking processing is a processing method for forming a shear fault having the same shape as a punch in the processing material by stopping the progress of the punch just before the blanking is completed.

[0054] The magnet fixing part 122 of the first yoke 120a may fix one side of the magnet 130, that is, one side of the magnet 130 disposed adjacent to the voice coil plate 150.

[0055] As described above, magnets 130 having different polarities are asymmetrically disposed around the voice coil plate 150. Therefore, an attraction may act between the magnets 130 facing each other.

[0056] Conventionally, in addition to the process of fixing the yoke 120 to the base frame 160, a bonding process of attaching the magnet 130 to the yoke 120 was required.

[0057] However, according to the present invention, the side surface of the magnet 130 is caught in the magnet fixing part 122 and movement of the magnet 130 toward the inside is restricted. Therefore, a bonding process of attaching the magnet 130 to the first yoke 120a may be omitted. Therefore, it is possible to reduce the production process and the use of subsidiary materials.

[0058] The second yoke 120b includes a base portion 123 in contact with the magnet 130 and a bent portion 124 which is bent in an orthogonal direction of the base portion 123. The bent portion 124 may be positioned adjacent to a side surface portion of the voice coil plate 150.

[0059] Referring to FIGS. 3(c) and 5(b), the bent portion 124 may be bent toward a direction opposite to that of the magnet 130.

[0060] That is, when the second yoke 120b is positioned on an upper surface of the magnet 130, the bent portion 124 may be bent upward, and when the second yoke 120b is positioned on a lower surface of the magnet 130, the bent portion 124 may be bent downward.

[0061] In addition, an upper surface or a lower surface of the first yoke 120a and a front end surface of the bent portion 124 of the second yoke 120b may be placed on the same horizontal extension line.

[0062] As shown in FIG. 3(c) and FIG. 5(b), magnets on both sides of the voice coil plate 150 may be disposed at different upper and lower positions as the upper surface or the lower surface of the first yoke 120a and the front end surface of the bent portion 124 of the second yoke 120b are placed on the same horizontal extension line.

[0063] As shown in FIGS. 4(a) and 4(b), the base frame 160 may include side through holes 162 penetrated through both sides to insert the magnet 130 and the yoke 120 into the inner space, a yoke guide part 161 which fixes both ends of the yoke 120 to limit a minimum distance g between the yokes 120 inserted into the inner space, and at least one insertion holes 163 formed on both sides.

[0064] A jig may be fixed to the base frame 160 through the insertion hole 163, and the center of the voice coil plate 150 may be guided using the fixed jig.

[0065] The yokes 120 disposed on both sides of the voice coil plate 150 may be spaced apart from the voice coil plate 150 by equal distances g1 and g2, and the distance between the yokes 120 may form an air gap g, which is a passage through which air moves when the voice coil plate 150 moves up and down.

[0066] Accordingly, by limiting the minimum value of the separation distances g1 and g2 between the voice coil plates 150 and the yokes 120 using the yoke guide part 161, the air gap g may be stably maintained, and the deterioration of the sound quality of the speaker may be prevented even in long-term use.

[0067] As illustrated in FIG. 4, the yoke guide part 161 may include a first yoke guide 161a to which both end portions of the first yoke 120a are fixed and a second yoke guide 161b to which both end portions of the second yoke 120b are fixed.

[0068] The yoke guide parts 161 on both sides of the voice coil plate 150 may be asymmetric.

[0069] That is, the first yoke guide 161a and the second yoke guide 161b may be disposed to face each other with respect to the voice coil plate 150.

[0070] In addition, the yoke guide part 161 may further include a magnet guide part 164 restricting movement of the magnet 130 in the longitudinal direction.

[0071] That is, the magnet 130 may be stably fixed to the base frame 160 by being restricted from moving in a width direction by the magnet fixing part 122 of the first yoke 120a and restricted from moving in a length direction by the magnet guide part 164.

[0072] FIG. 7 is a reference diagram for explaining a difference between a conventional flat speaker (a) and a flat speaker (b) according to an embodiment of the present invention.

[0073] The yokes 120 are disposed on the upper and lower surfaces of the magnet 130 to have the same polarity as the magnet 130 in contact.

[0074] Accordingly, the flat speaker b according to an embodiment of the present invention may expect the same performance as using the magnet 130 having the corresponding pole expanded in size (thickness) by changing and applying the cross section of the yoke 120.

[0075] That is, the flat speaker 100 according to the present invention has the same performance as using a magnet 130 having an S-pole or N-pole with a thickness which has a value of being added by the height of the bent portion 124 of the second yoke 120b, but the size of the magnet 130 actually applied is small, thereby reducing cost.

[0076] In addition, yoke 120 having different polarities are disposed opposite to both sides of the voice coil plate of the flat speaker, that is, at a position corresponding to the voice coil.

[0077] As shown in FIG. 7(a), in the case of a conventional flat plate-type speaker, the yoke 120′ having different polarities and the same cross-section (thickness) is disposed to face a position corresponding to the voice coil 151′.

[0078] Therefore, when the amplitude W′ is large, that is, when a low-band signal is input, the amplitude W′ of the voice coil plate 150′ is significantly greater than the thickness of the yoke 120′, and as a result, a reverse magnetic field is applied to the end of the voice coil plate 151′, and vertical vibration of the voice coil plate 150′ is not normally progressed.

[0079] However, according to the present invention, as shown in FIG. 7(b), the second yoke 120b has a thickness enlarged by the bent portion 124, and thus, even when the amplitude is large, that is, the amplitude of the voice coil plate 150 does not exceed the thickness of the second yoke 120b, thereby a problem of applying a reverse magnetic field to the end of the voice coil 151 is prevented.

[0080] Accordingly, the vertical vibration of the voice coil plate 150 is stably performed, and as a result, low sound as well as high output sound may be smoothly reproduced.

[0081] In addition, the magnetic field flows from the N pole to the S pole. The magnetic field starting from the N pole has the property of adhering to the nearest S pole at distance. Therefore, the magnetic field (the present invention) starting from the first yoke 120a (N pole) having a smaller area than the second yoke 120b (S pole) is more strongly formed than the magnetic field (prior art) flowing from the N pole having the same area to the S pole. And, this magnetic field can spread wider.

[0082] The spread magnetic field adheres to the nearest S pole, that is, the second yoke 120b disposed on the opposite side with respect to the voice coil plate 150, and the second yoke 120b receives a wide magnetic field transferred from the first yoke 120a using a large area of the bent portion 124 to facilitate circulation of the magnetic field.

[0083] That is, when the magnetic field is smoothly circulated using the bent portion 124 of the second yoke 120b, the vertical movement of the voice coil plate 150 becomes smooth, and as a result, it is possible to help improve the sound quality of the speaker.

[0084] In addition, the side through hole 162 of the base frame 160 and the rear (space) of the bent portion 124 of the second yoke 120b may facilitate the air flow inside the speaker, thereby facilitating the vertical movement of the voice coil plate 150 and consequently improving the sound quality of the speaker.

[0085] That is, according to the present invention, it is possible to implement a flat speaker 100 capable of reducing production processes and reducing costs as well as improving performance such as smooth sound reproduction and sound quality maintenance compared to existing flat speakers.

[0086] Features, structures, effects, and the like described in the embodiments are included in an embodiment of the present invention, and are not necessarily limited to one embodiment. Furthermore, the features, structures, effects, and the like illustrated in each embodiment may be implemented in combination or modification with other embodiments by a person of ordinary skill in the field to which the embodiments belong. Therefore, it should be interpreted that the contents related to these combinations and modifications are included in the scope of the present invention.

[0087] In addition, although the embodiment has been mainly described above, this is merely an example and the present invention is not limited, and it will be appreciated by a person skilled in the art that various modifications and applications not illustrated are possible within the essential characteristics of this embodiment.

[0088] For example, each component specifically shown in the embodiment may be modified and implemented. And differences related to these modifications and applications should be interpreted as falling within the scope of the present invention as defined in the appended claims.

REFERENCE NUMERALS

[0089] 100: flat panel speaker [0090] 220: fixing member [0091] 110: damper [0092] 120: yoke [0093] 130: magnet [0094] 140: diaphragm. [0095] 150: voice coil plate [0096] 160: base frame [0097] 210: lead terminal [0098] 220: gasket (fixing member) [0099] 120a: first yoke [0100] 120b: second yoke [0101] 122: magnet fixing part [0102] 123: base portion [0103] 124: bent portion [0104] 151: voice coil [0105] 161: yoke guide [0106] 162: side through hole [0107] 163: insertion hole [0108] 164: magnet guide part [0109] 161a: first yoke guide [0110] 161b: second yoke Guide [0111] g: air gap [0112] g1, g2: distance between the voice coil plate and the yoke. [0113] W: amplitude