WO2008072830A1

WO2008072830A1 - Multi-functional microspeaker

Info

Publication number: WO2008072830A1
Application number: PCT/KR2007/003377
Authority: WO
Inventors: Sung-Moon Han; Jong-Man Kim
Original assignee: Ifeelu Inc.
Priority date: 2006-12-12
Filing date: 2007-07-12
Publication date: 2008-06-19

Abstract

Disclosed is a multi-functional microspeaker for achieving various vibration motor functions, a tactile vibration function, an attached-speaker function and a bone-conduction function, besides a general speaker function.

Description

Description MULTI-FUNCTIONAL MICROSPEAKER

Technical Field

[1] The present invention relates to a multi-functional microspeaker for achieving various vibration motor functions, a tactile vibration function, an attached-speaker function and a bone-conduction function, besides a general speaker function. Background Art

[2] In general, a microspeaker means a sound microspeaker using a magnet, and includes a magnet supporter fixed on a lower housing, a magnet assembled to the magnet supporter, a diaphragm for generating sound, and a sound coil vertically downwardly attached to the lower portion of the diaphragm and downwardly disposed to the outer circumference of the magnet.

[3] In the field of a speaker using a magnet, recently- appearing speakers include vibration speakers using generated vibrations instead of a conventional diaphragm. Specifically, such recent vibration speakers include a bone-conduction speaker transferring sound through bone vibrations instead of air propagation, and a tactile sound speaker transferring vibrations through tactile sense (skin).

[4] In a general magnetic sound speaker, electrical sound signals applied to a sound coil reproduces sound by vibrating a diaphragm (including a carbon sheet).

[5] A vibration speaker using a magnet usually generates vibrations by using a vibration coil and a magnet. Such a structure of generating vibrations includes a variety of structures. However, such various structures cannot be applied to a microspeaker because the microspeaker requires a different structure.

[6] In a conventional speaker used for a slim-type multimedia mobile communication device such as a mobile phone, it is possible to reproduce a sound source including music, game sounds, etc., simply through ringing sound. However, there has been a problem in that the conventional speaker cannot provide vibration contents for implementing various vibrations (such as tactile vibrations of transferring sound vibrations through skin, and a vibration motor function, etc.), a bone-conduction function for transferring sound not through ears (external/middle ears), and an attached-speaker function in which attached material is vibrated and functions as a speaker.

[7] In such a sound speaker using a magnet and a vibration speaker using a magnet, it is possible to utilize components (such as a magnet) unified as one integrated structure. When the components are unified as one integrated structure, it is possible to achieve an integrated multi-functional speaker providing functions of both sound/vibration speakers in a single speaker structure.

[8] However, the addition of the above described various functions to one speaker structure may increase the overall volume of a device, and it is thus problematic to add the various functions to a handheld multimedia mobile communication device (such as a mobile phone). Therefore, it can be said that there is an urgent requirement for structural improvement in order to achieve all of the above described multi-functions in a micro size.

[9] Accordingly, in the field of the integrated multi-functional speaker, the applicant of this application has uniquely researched structural improvement of a micro-sized multi-functional speaker in order to achieve the above described various functions in a micro size applicable to a slim-type mobile phone.

[10] There was an application entitled "Multi-functional Two-way Micro-speaker having

Characteristics of tactile sound, bone-conduction, and vibration motor" previously filed by the present applicant and assigned Serial No. 10-2003-0078919. The application provides the idea of a microspeaker including a diaphragm 10, an elastic supporter 13, and a vibration coil member 19, as shown in FIG. 1. Herein, the diaphragm 10 is disposed at the uppermost portion within a housing 12 and reproduces sound by vibrations of a sound coil member 11. In the elastic supporter 13 (such as an elastic bridge, a leaf-spring having a ring-shaped frame, etc.) at the lowest portion of the housing 12, the frame is attached to a lateral housing 12a, and the central portion of the elastic supporter 13 is fixed to the center of a

shaped magnet supporter 14 supporting two magnets by a central assembling member 15 (such as a pin, a rivet, or adhesives). The vibration coil member 19 is upwardly disposed and fixed to the elastic supporter 13, thereby reducing the thickness of a single-layer magnet and improving vibration force.

[11] Herein, the magnet supporter 14 is assembled with the elastic supporter 13 by the central assembling member 15, such as a pin, a rivet, etc., and supports the lower portion of a central magnet 17 and the upper portion of an outer ring magnet 18 in a

shape. Also, the magnet supporter 14 is integrated with the two magnets 17 and 18, the central assembling member 15, the elastic member 13, and a protection member 14a as one vibration weight. [12] The magnet supporter 14 is set in such a manner that the magnet supporter 14 is spaced apart from both the outer lateral portion of the central magnet 17 and the inner lateral portion of the outer ring magnet 18, thereby forming two divided spaces between the central magnet 17 and the outer ring magnet 18. In an upward-open space, the sound coil member 11 is positioned, and in a downward-open space, the vibration coil member 19 is positioned. Herein, the sound coil member 11 is downwardly disposed to the lower portion of the diaphragm 10, and the vibration coil member 19 is upwardly disposed to the upper portion of the elastic supporter 13.

[13] The housing 12 including an upper housing 12b protects the above described components from external impact, and prevents the loss of vibration force. Also, the housing 12 is assembled with the elastic supporter 13 so that vibrations of a vibration weight can be efficiently dispersed within the housing, thereby minimizing the overall size of a device and efficiently transferring vibrations to outer attached material.

[14] However, in a vibration microspeaker according to a conventional patent application technology, there has been a problem in that a vibration coil member 16 works as a disturbing factor of vibrations generated from the elastic supporter 13. The vibration coil member 16, vertically attached to the elastic supporter 13 and disposed between the outer ring magnet 18 and the magnet supporter 14, generates vibration force by a magnetic field generated between the outer ring magnet 18 and the magnet supporter 14. But herein, direct attachment of the vibration coil member 16 on the elastic supporter 13 disturbs vibrations of the elastic supporter 13, and reduces vibrations generated from a vibration weight (that is, the central magnet 17, the outer ring magnet 18, the magnet supporter 14, the elastic supporter 13, the central assembling member 15 and the protection member 14a unified as one vibration weight). Therefore, there has been a demand for promoting vibrations of a vibration weight by directly fixing the vibration coil member 16 to the housing, instead of a vibration weight (including the elastic supporter 13). Also, there has been a demand for improving an assembly method in such a manner that it is possible to assemble the microspeaker while keeping the elastic supporter 13 intact. It is proper that a vibration coil and a magnet, which are vibration generating factors, are spaced apart from each other, and one of them generates force at a fixed position while the other receives the force as a vibration weight. However, in the conventional technology, a magnet is included in a vibration weight, and a vibration coil is also assembled with an elastic supporter (which is included in the vibration weight). That is, since all components are assembled in one unit, it is impossible to sufficiently implement vibrations. Disclosure of Invention Technical Problem

[15] The present invention provides a micro-sized multi-functional speaker of sound/ bone-conduction/vibration functions so as to achieve various vibration levels in one microspeaker by removing disturbing/restraining factors of generating/transferring vibration force, which may be caused by the internal structure thereof. The various vibration levels include minute vibrations for bone-conduction up to strong vibrations for a vibration motor. Herein, in order to promote vibrations of one vibration weight (that is, a central magnet/ an outer ring magnet/ a magnet supporter/ an elastic supporter/ an assembling member/ a protection member unified as one vibration weight), a supporter for a vibration coil member is fixed to a lower housing or a lateral housing, avoiding elastic bridges of the elastic supporter. Therefore, the vibration weight can sufficiently vibrate upward and downward without fixation of the vibration coil member. Technical Solution

[16] In accordance with an aspect of the present invention, there is provided a multifunctional microspeaker including: a housing covering a lateral surface; a central magnet mounted within the housing; a magnet supporter supporting a lower portion of the central magnet; an elastic supporter including at least one elastic bridge passing over a center in a lower portion within the housing and supporting a lower portion of the magnet supporter, ends of the elastic bridge being fixed to the housing so as to prevent eccentricity of the elastic supporter, and the elastic bridge being concentrically assembled with the magnet supporter through a central assembling member; a vibration coil member assembled to an outer circumference of the central magnet with a space therebetween; and a coil supporter including the vibration coil member at a height of the outer circumference of the central magnet and supporting the vibration coil member, in which a lower portion of the coil supporter is assembled and fixed to the housing, avoiding the elastic bridge of the elastic supporter, and an upper portion of the coil supporter is vertically upward.

[17] The housing is selectively provided with an upper housing covering an upper portion and/or a lower housing covering a lower portion.

[18] According to another aspect of the present invention, the multi-functional microspeaker further includes: an outer ring magnet surrounding the central magnet, a diaphragm of which an outer circumference is fixed at the uppermost portion of the housing so as to reproduce sound vibrations, and a sound coil member downwardly attached to a lower portion of the diaphragm, wherein the coil supporter is attached and fixed to the housing in such a manner that the vibration coil member is vertically upwardly disposed between the central magnet and the outer ring magnet; and the magnet supporter in a form of

supports the lower portion of the central magnet, fixes an upper portion of the outer ring magnet, and is set in such a manner that the magnet supporter is spaced apart from both an outer lateral portion of the central magnet and an inner lateral portion of the outer ring magnet, thereby forming two divided spaces between the central magnet and the outer ring magnet. Herein, in an upward-open space, the sound coil member is disposed, and in a downward-open space, the vibration coil member is disposed, the sound coil member being vertically downwardly assembled to the lower portion of the diaphragm, and the vibration coil member being formed on the upper portion of the coil supporter.

[19] According to a further aspect of the present invention, the multi-functional mi- crospeaker further includes: a first outer ring magnet surrounding the central magnet, a second outer ring magnet surrounding the first outer ring magnet, a diaphragm of which an outer circumference is fixed at the uppermost portion within the housing so as to reproduce sound vibrations, and a sound coil member downwardly attached to a lower portion of the diaphragm, wherein the coil supporter is attached and fixed to the housing in such a manner that the vibration coil member is vertically upwardly disposed between the first outer ring magnet and the second outer ring magnet; the magnet supporter supports lower portions of both the central magnet and the first outer ring magnet, and, connects upper portions of the first and second outer ring magnets, and an outer lateral portion and a lower portion of the second outer ring magnet by attaching one protection member; and the sound coil member is vertically downwardly attached to the lower portion of the diaphragm, and is disposed between the central magnet and the first outer ring magnet.

[20] According to a still further aspect of the present invention, the multi-functional mi- crospeaker further includes: an outer ring magnet surrounding the central magnet, wherein the magnet supporter supports the lower portion of the central magnet, and covers/connects upper portions of the central magnet and the outer ring magnet by one protection member; and the coil supporter is attached and fixed to the housing in such a manner that the vibration coil member is vertically upwardly disposed between the central magnet and the outer ring magnet.

[21] According to a yet further aspect of the present invention, the multi-functional mi- crospeaker further includes: an outer ring magnet surrounding the central magnet, an upper magnet formed on the central magnet, a diaphragm of which an outer circumference is fixed at the uppermost portion of the housing so as to reproduce sound vibrations, and a sound coil member downwardly attached to a lower portion of the diaphragm, wherein the coil supporter is attached and fixed to the housing in such a manner that the vibration coil member is vertically upwardly disposed between the central magnet and the outer ring magnet; upper portions of the central magnet and the outer ring magnet are covered by a protection member; and the sound coil member is downwardly disposed to an outer circumference of the upper magnet.

Advantageous Effects [22] In a multi-functional microspeaker according to the present invention, a coil supporter is introduced, the coil supporter enabling a coil member to be vertically installed while not disturbing vibrations of an elastic supporter. Therefore, vibrations can be smoothly generated and transferred from a vibration weight (that is, a central magnet, an outer ring magnet, a magnet supporter, a assembling member and a protection member unified as one vibration weight), and thereby various functions can be sufficiently achieved. Herein, the functions include a vibration motor function requiring strong vibrations up to a bone-conduction speaker function requiring transfer of minute vibrations.

[23] In the present invention, a structure around an integrated magnet structure is changed in such a manner that one microspeaker can achieve a variety of functions, such as a sound speaker function, a bone-conduction function, and a vibration motor function. Therefore, in application to a handheld multimedia communication device (such as a mobile phone), it is expected that the multi-functional speaker can consider ably contribute to cost/space reduction by replacing "a sound speaker, a receiver (a telephone speaker), and a vibration motor" with one unit.

[24] Since a receiver is replaced by a bone-conduction speaker, it is possible to provide bone-conduction services such as hearing impairment support, eardrum protection, a telephone conversation in a noisy environment, privacy protection, an emergency call, etc. Also, a vibration motor can provide a vibration contents service in which a vibration level is easily adjusted by a frequency and volume (output), instead of a conventional simple vibration.

[25] Also, the microspeaker according to the present invention provides an attachment speaker service in which an attached object vibrates and emits sound. Accordingly, to summarize the above mentioned description, it can be said that the microspeaker according to the present invention can change the landscape in the market of speakers, and is expected to have strong market competitive power. Brief Description of the Drawings

[26] The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which:

[27] FIG. 1 is a cross-sectional view of a speaker including conventional vibration characteristics;

[28] FIG. 2 is an exploded perspective view illustrating a first embodiment of a multifunctional microspeaker according to the present invention;

[29] FIG. 3 is a cross-sectional view illustrating a first embodiment of a multi-functional microspeaker according to the present invention; [30] FIG. 4 is a detailed view illustrating a coil supporter and a vibration coil member of a multi-functional microspeaker according to the present invention;

[31] FIG. 5 is a cross-sectional view illustrating a second embodiment of a multifunctional microspeaker according to the present invention;

[32] FIG. 6 is a cross-sectional view illustrating a third embodiment of a multifunctional microspeaker according to the present invention;

[33] FIG. 7 is a cross-sectional view illustrating a fourth embodiment of a multifunctional microspeaker according to the present invention; and

[34] FIG. 8 is a cross-sectional view illustrating a fifth embodiment of a multi-functional microspeaker according to the present invention. Mode for the Invention

[35] Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

[36] FIG. 2 is an exploded perspective view illustrating a first embodiment of a multifunctional microspeaker according to the present invention. The multi-functional microspeaker according to a first embodiment includes a disk-type upper housing, an elastic supporter, and a coil supporter. The elastic supporter disposed at the lower portion within a housing includes at least one elastic bridge and a frame attached to a lateral housing. The coil supporter is upwardly fixedly provided in a lower housing, avoiding the elastic bridge of the elastic supporter, and includes a vibration coil member to be disposed to the outer circumference of a central magnet.

[37] A housing is an essential component for fixing internal components and protecting the product from external impact, and basically includes a structure covering a lateral surface. The housing transfers vibrations to the outside while dispersing all vibrations generated from a vibration weight (that is, a central magnet, an outer ring magnet, a magnet supporter, a central assembling member and a protection member unified as one vibration weight) to the entire housing.

[38] The housing may be realized in various forms including a square pillar, a circular cylinder, etc. according to design requirements of an object. Since a housing form has influence on internal component forms, the internal components are formed similarly to the housing form, with an adjusted scale.

[39] FIG. 2 is an embodiment of the present invention, and illustrates a cylindrical- pipe-shaped lateral housing, disk-type upper/lower housings, and other internal components basically formed in a circle. The embodiment illustrated in FIG. 2 is only one example, and thus shapes of housings and internal components are not limited only to the above embodiment.

[40] The illustrated housing may be divided into a cylindrical-pipe-shaped lateral housing and disk-type upper/lower housings, or may be in a single body. In the initial state in the process of manufacturing the housing, a cylindrical-pipe-shaped lateral housing and disk-type upper/lower housings are separated. Then, the lateral housing and the upper (or lower) housing are connected with each other, and internal components are built up in layers. Finally, the lower (or upper) housing is connected.

[41] Herein, when the entire thickness of a speaker is required to be reduced, there is no harm in selectively omitting the upper housing and/or the lower housing.

[42] Hereinafter, in description of internal components in a case where a cylindrical housing covering the entire surface is employed, a form suitable for the cylindrical housing will be specifically mentioned. However, such a mention is only for describing the embodiment, and is not intended to limit the scope of the present invention to the form.

[43] A central magnet 27 mounted within a housing 22 is a cylindrical single-layer magnet, and is assembled with a magnet supporter 24 supporting the lower portion of the central magnet 27.

[44] An elastic supporter 23 includes at least one elastic bridge 23a. Herein, at the lower portion within the housing, one end of the elastic bridge is fixed to a lateral housing 22a or a lower housing 22c (direct attachment or indirect attachment through an assembling member) so as to prevent eccentricity of the elastic supporting member, and the other end is concentrically assembled with the magnet supporter 24 by a central assembling member 25, such as a rivet, a pin, or adhesives, etc. Also, the elastic supporter 23 fixes the magnet supporter 24 in such a manner that the magnet supporter is spaced apart from the lower housing 22c, Therefore, a central magnet, an outer ring magnet, a magnet supporter, an assembling member and a protection member vibrate as an integrated vibration weight, and transfer vibrations of all levels generated within the housing with no loss to the outside.

[45] When a rivet or a pin is used as the central assembling member 25, it is preferable that the elastic supporter 23 and the magnet supporter 24 include a through hole 24a at the center.

[46] A vibration coil member 29 causing vibrations is disposed on a coil supporter 29a acting as a supporting axis, at a position to be spaced apart from the outer circumference of the central magnet. Herein, the lower portion of the coil supporter 29a is fixedly provided in the lateral or lower housing, avoiding the elastic bridge 23 a of the elastic supporter 23, and on the other hand, the upper portion is vertically upwardly positioned within the housing, and includes the vibration coil member at the height of the outer circumference of the central magnet so that the vibration coil member can be supported.

[47] When the coil supporter is provided in the lower housing, first, the vibration coil member (e.g. a bobbin coil) is assembled on the coil supporter, the coil supporter including the lower portion having divisions of the same number as that of the elastic bridge. Then, the vibration coil member assembled on the coil supporter is upwardly fixedly disposed in the lower housing 22c, avoiding the elastic bridge of the elastic supporter, and thereby enhances the stability of vibration performance while keeping the original form of the vibration coil member.

[48] FIG. 3 is a cross-sectional view of a multi-functional microspeaker including assembled components. In installation of a coil to a single layer magnet, the vibration coil member is disposed to the lateral portion of the magnet, instead of the housing, because the coil supporter 29a is provided in the lower housing 22c, avoiding the elastic bridge 23a. Therefore, a central magnet, an outer ring magnet, a magnet supporter, a central assembling member and a protection member can vibrate as an integrated vibration weight, and can smoothly move upward/downward.

[49] FIG. 4 is a detailed view partially illustrating a coil supporter and a vibration coil member of a multi-functional microspeaker according to a first embodiment of the present invention. The coil supporter 29a is upwardly attached and fixed to the lower housing 22c, avoiding the elastic bridge 23a of the elastic supporter 23, in such a manner that upward/downward vibrations of the elastic supporter 23 are not disturbed. When magnetic force of the central magnet is influenced by magnetic force of sound signals generated from the vibration coil member 29, vibrations occur.

[50] A handheld multimedia mobile communication device (such as a mobile phone) requires a micro size (e.g. a diameter of 10mm) except for a diaphragm. Herein, it is preferable that the simplified elastic bridge 23a is employed as the elastic supporter 23 in order to maintain the elasticity. Also, it is required that the number/form of the elastic bridge 23a is adjusted according to the weight and vibration force of a vibration weight (that is, a central magnet, an outer ring magnet, a magnet supporter, a central assembling member and a protection member unified as one vibration weight).

[51] In the elastic bridge including an elastic body such as a leaf spring, it is preferable that the elastic bridge has a form having a repeatedly changing phase in a view from one side, such as a wave form. Herein, one end from both ends of the elastic bridge may be attached to the lateral housing or the lower housing in such a manner that eccentricity does not occur, or may be fixed through an additional supporter.

[52] The multi-functional microspeaker according to the present invention is intended for application to a micro-sized mobile phone. The embodiment in FIG. 4 is applicable to a speaker having a diameter of about 10mm, and illustrates one bridge provided in an elastic supporter including a ring-shaped frame (supporter). Herein, the bridge extends from one end of the frame to another end in such a manner that eccentricity does not occur. [53] The one bridge may employ two elastic bodies (e.g. leaf springs) connected at the center, each of the two elastic bodies having a length from the frame of the elastic supporter to the center, or otherwise may employ one elastic body having a length from one end of the frame of the elastic supporter to another end.

[54] Since the elastic supporter 23 is provided with the elastic bridge 23a fixed to the lateral housing, the coil supporter 29a vertically upwardly attached and fixed to the lower housing 22c includes the lower portion having divisions so as to avoid the elastic bridge 23a. Also, at the height exceeding the elastic supporter 23, the coil supporter 29a includes a single cylindrical form, and from above the height of the inner circumference of the outer ring magnet 27, the vibration coil member is formed on the coil supporter 29a.

[55] However, the coil supporter may be attached to the lateral housing as well as the lower housing. Therefore, in installation of the vibration coil member by using the coil supporter, it is important that the vibration coil member is disposed to the outer circumference of the central magnet, avoiding the elastic supporter. Herein, if the above described requirements are satisfied, it does not matter which form is used for the structure. Also, besides the described embodiment, a "^{J L}" shaped coil supporter may be employed/fixed to the lateral housing at a position above the elastic supporter.

[56] Since the vibration coil member 29 is upwardly disposed to the inner circumference of the outer ring magnet, it is possible to generate vibration force for vibrating a vibration weight (that is, a central magnet, an outer ring magnet, a magnet supporter, a assembling member and a protection member unified as one vibration weight), without disturbing vibrations of the elastic supporter 23. In other words, the integrated vibration weight can freely vibrate upward/downward because the vibration coil member is assembled on the coil supporter fixed to the lower housing. Therefore, it is possible to create a speaker structure for maximizing the vibration level.

[57] The coil supporter according to the present invention is at a position avoiding the elastic supporter in order to prevent the disturbance of vibrations of the elastic supporter, and includes the vibration coil member assembled with the outer circumference of the central magnet. Herein, the lower portion of the coil supporter is fixed to the lower housing or the lateral housing, and the upper portion is upwardly disposed and fixed within the housing so as to reach the outer circumference of the central magnet. When the coil supporter is fixed to the lower housing, the form of the coil supporter may be realized in various ways according to an elastic bridge form of an elastic supporter. Accordingly, the invention is not limited in scope to this particular embodiment.

[58] FIG. 5 is a cross-sectional view illustrating a second embodiment of a multifunctional microspeaker according to the present invention. The second embodiment can be made by modification of a first embodiment.

[59] A speaker structure according to the second embodiment further includes an outer ring magnet 38 within a housing 32, the outer ring magnet surrounding a cylindrical central magnet 37 with a space therebetween, a diaphragm 30 positioned at the uppermost portion of the housing 32, and a sound coil member 31 downwardly attached to the lower portion of the diaphragm. A coil supporter 39a is assembled and fixed to a lower housing, avoiding an elastic bridge 33a of an elastic supporter 33, in such a manner that a vibration coil member 39 can be vertically upwardly disposed between the central magnet 37 and the outer ring magnet 38.

[60] The diaphragm 30 at the uppermost portion of the housing reproduces sound vibrations through vibrations of the sound coil member 31 downwardly attached to the lower portion of the diaphragm.

[61] Also, a magnet supporter 34 is shaped in the form of '

', so as to support the lower portion of the central magnet, and to fix the upper portion of the outer ring magnet. The magnet supporter 34 is set in such a manner that the magnet supporter 34 is spaced apart from both the outer lateral portion of the central magnet 37 and the inner lateral portion of the outer ring magnet 38, thereby forming two divided spaces. Herein, in an upward-open space, the sound coil is disposed, and in a downward-open space, the vibration coil member is disposed. The sound coil is downwardly attached to the lower portion of the diaphragm, and the vibration coil member is upwardly assembled to the upper portion of the elastic supporter.

[62] The upper portion of the central magnet and the lower portion of the outer ring magnet, which are not covered by the magnet supporter 34, are covered by a protection member 34a so as to prevent loss of magnetic force.

[63] The protection member 34a has a shape of a plate, and includes materials such as pure iron. On the magnets, the protection member 34a prevents loss of magnetic force and induces electromagnetic force in the intentional direction.

[64] According to the second embodiment, the '

¹ shaped magnetic supporter 34 supports the magnets, and at the same time provides spaces for a sound coil and a vibration coil upwardly/downwardly disposed between magnets. Therefore, it is possible achieve a sound/vibration two-way speaker. The polarity of the magnet supporter is reversed to the same as that of a magnet on which the magnet supporter is attached, and is opposed to that of an adjacent magnet. Thus, between the magnet supporter and each magnet, a very strong magnetic field is generated, thereby maximizing vibration force generated by a vibration coil member. [65] Also, the microspeaker according to the second embodiment includes a sound coil member 31, an elastic supporter 33, and a central assembling member 35. Herein, the sound coil member 31 is attached to the diaphragm, an outer frame of the elastic supporter 33 is fixed to the lowest portion of the housing, and the central assembling member 35 is used to concentrically assemble the elastic supporter 33 with the magnet supporter.

[66] FIG. 6 is a cross-sectional view illustrating a third embodiment of a multifunctional microspeaker according to the present invention. Herein, the description of the present embodiment that overlaps that of the above described embodiments may be omitted.

[67] In the same manner of the second embodiment, the third embodiment of the present invention is a two-way speaker achieving sound/vibration speaker functions and a vibration function. Differently from the second embodiment, the structure of the third embodiment further includes an additional outer ring magnet, and thus has a size larger than those of the first/second embodiments.

[68] In other words, the multi-functional microspeaker according to the third embodiment includes a cylindrical central magnet 47, a first outer ring magnet 48 surrounding the central magnet 47, and a second outer ring magnet 48a surrounding the first outer ring magnet 48. Such increase in the number of magnets for vibrations strengthens vibration force.

[69] Herein, a sound coil member 41 is downwardly disposed to the lower portion of a diaphragm 40, and is positioned between the central magnet 47 and the first outer ring magnet 48. Also, a vibration coil member 49 is vertically upwardly assembled to a lower housing 42c by a coil supporter 49a, and is disposed between the first outer ring magnet 48 and the second outer ring magnet 48a, thereby generating vibrations.

[70] A magnet supporter 44 supports the lower portions of both the central magnet 47 and the first outer ring magnet 48. A plate-shaped protection member 44a (including materials such as pure iron, etc.) covers the magnets, thereby fixing the positions of the magnets and minimizing loss of magnetic force. Herein, the protection member 44a solely covers the upper portion of the central magnet 47. Also, the protection member 44a simultaneously covers both the upper portions of the first and second outer ring magnets 48 and 48a and the outer lateral portion and the lower portion of the second outer ring magnet 48a while connecting them with each other.

[71] The model according to the third embodiment is applicable to a product requiring stronger vibration force despite an increased diameter, and is for a sound/vibration two-way speaker.

[72] Also, the microspeaker according to the third embodiment includes a housing 42, an elastic supporter 43, and a central assembling member 45. Herein, an outer frame of the elastic supporter 43 is fixed to the lowest portion within the housing, and the central assembling member 45 is used to concentrically assemble the elastic supporter 43 with the magnet supporter.

[73] FIG. 7 is a cross-sectional view illustrating a fourth embodiment of a multifunctional microspeaker according to the present invention. Herein, the description of the present embodiment that overlaps those of the above described embodiments may be omitted.

[74] The fourth embodiment of the present invention is a one-way speaker excluding a sound speaker function. In the microspeaker according to the fourth embodiment, differently from the second and third embodiments, a diaphragm and a sound coil member are omitted. However, the structure is constructed similarly to the second embodiment. In other words, a central magnet 57 and an outer ring magnet 58 provided in the structure are fixed by an elastic supporter 53 and a magnet supporter 54 in such a manner that vibrations of the magnets are kept. Also, one protection member 54a covers upper portions of both the central magnet 57 and the outer ring magnet 58, and a vibration coil member 59 is disposed between the central magnet 57 and the outer ring magnet 58 by a coil supporter 59a vertically upwardly fixed and attached to a lower housing 52c.

[75] Such a microspeaker according to the fourth embodiment is a one-way vibration speaker achieving a vibration speaker function and a vibration motor function except for a sound speaker function, and has a structure capable of greatly reducing the thickness of a speaker.

[76] Also, the microspeaker according to the fourth embodiment includes a housing 52 and a central assembling member 55 for concentrically assembling the elastic supporter 53 with the magnet supporter 54.

[77] FIG. 8 is a cross-sectional view illustrating a fifth embodiment of a multi-functional microspeaker according to the present invention. Herein, the description of the present embodiment that overlaps that of the above described embodiments may be omitted.

[78] The fifth embodiment of the present invention is a two-way vibration speaker including a sound speaker function. The microspeaker according to the fifth embodiment has a structure capable of omitting a lower housing, and thus there is an advantage in that the thickness of a speaker can be further reduced.

[79] The structure of the fifth embodiment further includes an outer ring magnet 68 surrounding a central magnet 67, an upper magnet 67a on the central magnet 67, a diaphragm 60 of which the outer circumference is fixed to a lateral housing at the uppermost portion within a housing so as to reproduce sound, and a sound coil member 61 downwardly attached to the lower portion of the diaphragm.

[80] A coil supporter 69a is attached and fixed to the lateral housing in such a manner that a vibration coil member can be vertically upwardly disposed between the central magnet 67 and the outer ring magnet 68. Also, a protection member 64a connects and fixes the upper portions of the central magnet 67 and the outer ring magnet 68, and the sound coil member 61 is downwardly disposed to the outer circumference of the upper magnet 67a.

[81] Herein, in order to increase vibration sense, the thickness of the protection member

64a fixedly connecting the upper portions of the central magnet 67 and the outer ring magnet 68 can be increased as far as the sound coil member 61 can be downwardly installed.

[82] The above description focuses on only the final disposition of respective components due to the importance of the structure according to the present invention, but does not mention a specific manufacturing process/method. Therefore, no matter which manufacturing method is selected, the same structure as that of the multifunctional speaker according to the present invention will still be within the scope of the claims of the present invention.

Claims

[1] A multi-functional microspeaker comprising: a housing covering a lateral surface; a central magnet mounted within the housing; a magnet supporter supporting a lower portion of the central magnet; an elastic supporter comprising at least one elastic bridge passing over a center in a lower portion within the housing and supporting a lower portion of the magnet supporter, ends of the elastic bridge being fixed to the housing so as to prevent eccentricity of the elastic supporter, and the elastic bridge being concentrically assembled with the magnet supporter through a central assembling member; a vibration coil member assembled to an outer circumference of the central magnet with a space therebetween; and a coil supporter including the vibration coil member at a height of the outer circumference of the central magnet and supporting the vibration coil member, in which a lower portion of the coil supporter is assembled and fixed to the housing, avoiding the elastic bridge of the elastic supporter, and an upper portion of the coil supporter is vertically upward.

[2] The multi-functional microspeaker as claimed in claim 1, wherein the housing is selectively provided with an upper housing covering an upper portion and/or a lower housing covering a lower portion.

[3] The multi-functional microspeaker as claimed in claim 1 or 2, further comprising an outer ring magnet surrounding the central magnet, a diaphragm of which an outer circumference is fixed at the uppermost portion of the housing so as to reproduce sound vibrations, and a sound coil member downwardly attached to a lower portion of the diaphragm, wherein the coil supporter is attached and fixed to the housing in such a manner that the vibration coil member is vertically upwardly disposed between the central magnet and the outer ring magnet; and the magnet supporter in a form of '

' supports the lower portion of the central magnet, fixes an upper portion of the outer ring magnet, and is set in such a manner that the magnet supporter is spaced apart from both an outer lateral portion of the central magnet and an inner lateral portion of the outer ring magnet, thereby forming two divided spaces between the central magnet and the outer ring magnet. Herein, in an upward- open space, the sound coil member is disposed, and in a downward-open space, the vibration coil member is disposed, the sound coil member being vertically downwardly assembled to the lower portion of the diaphragm, and the vibration coil member being formed on the upper portion of the coil supporter.

[4] The multi-functional microspeaker as claimed in claim 1 or 2, further comprising a first outer ring magnet surrounding the central magnet, a second outer ring magnet surrounding the first outer ring magnet, a diaphragm of which an outer circumference is fixed at the uppermost portion within the housing so as to reproduce sound vibrations, and a sound coil member downwardly attached to a lower portion of the diaphragm, wherein the coil supporter is attached and fixed to the housing in such a manner that the vibration coil member is vertically upwardly disposed between the first outer ring magnet and the second outer ring magnet; the magnet supporter supports lower portions of both the central magnet and the first outer ring magnet, and, connects upper portions of the first and second outer ring magnets, and an outer lateral portion and a lower portion of the second outer ring magnet by attaching one protection member; and the sound coil member is vertically downwardly attached to the lower portion of the diaphragm, and is disposed between the central magnet and the first outer ring magnet.

[5] The multi-functional microspeaker as claimed in claim 1 or 2, further comprising an outer ring magnet surrounding the central magnet, wherein the magnet supporter supports the lower portion of the central magnet, and covers/connects upper portions of the central magnet and the outer ring magnet by one protection member; and the coil supporter is attached and fixed to the housing in such a manner that the vibration coil member is vertically upwardly disposed between the central magnet and the outer ring magnet.

[6] The multi-functional microspeaker as claimed in claim 1 or 2, further comprising an outer ring magnet surrounding the central magnet, an upper magnet formed on the central magnet, a diaphragm of which an outer circumference is fixed at the uppermost portion of the housing so as to reproduce sound vibrations, and a sound coil member downwardly attached to a lower portion of the diaphragm, wherein the coil supporter is attached and fixed to the housing in such a manner that the vibration coil member is vertically upwardly disposed between the central magnet and the outer ring magnet; upper portions of the central magnet and the outer ring magnet are covered by a protection member; and the sound coil member is downwardly disposed to an outer circumference of the upper magnet.

[7] The multi-functional microspeaker as claimed in claim 3, wherein an upper portion of the central magnet and a lower portion of the outer ring magnet are covered by a protection member.

[8] The multi-functional microspeaker as claimed in claim 4, wherein an upper portion of the central magnet is covered by an additional protection member.

[9] The multi-functional microspeaker as claimed in claim 5, wherein a lower portion of the outer ring magnet is covered by an additional protection member.

[10] The multi-functional microspeaker as claimed in claim 6, wherein in the protection member connecting the upper portions of the central magnet and the outer ring magnet, it is possible to change a form of the protection member in order to adjust a weight of an entire speaker and efficiency of the diaphragm.

[11] The multi-functional microspeaker as claimed in claim 1, wherein the housing is selectively provided with the elastic supporter or the coil supporter, thereby forming an integrated form.