KR20160004693A - Bone conduction speaker - Google Patents

Bone conduction speaker Download PDF

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Publication number
KR20160004693A
KR20160004693A KR1020140083502A KR20140083502A KR20160004693A KR 20160004693 A KR20160004693 A KR 20160004693A KR 1020140083502 A KR1020140083502 A KR 1020140083502A KR 20140083502 A KR20140083502 A KR 20140083502A KR 20160004693 A KR20160004693 A KR 20160004693A
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KR
South Korea
Prior art keywords
bone conduction
permanent magnet
conduction speaker
frequency
coil
Prior art date
Application number
KR1020140083502A
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Korean (ko)
Inventor
이인호
Original Assignee
(주)테라다인
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Priority to KR1020140083502A priority Critical patent/KR20160004693A/en
Publication of KR20160004693A publication Critical patent/KR20160004693A/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
    • 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
    • H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
    • H04R2209/024—Manufacturing aspects of the magnetic circuit of loudspeaker or microphone transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/13—Hearing devices using bone conduction transducers

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

Provided is a bone conduction speaker comprising: a case forming a space therein; a support member arranged inside the case; a permanent magnet coupled to a lateral side of the support member and having a space therein; a frequency regulating member arranged in the space of the permanent magnet; an elastic member with one lateral side fixed on an inner side of the case and the other lateral side connected to the support member; a coil arranged to wrap a portion of the permanent magnet; and a power supply connected to the coil and combined with the case. Since a movable unit includes the frequency regulating member to regulate a resonant frequency of the bone conduction speaker by the change in weight of the movable unit, the bone conduction speaker can operate in the resonant frequency and consequently obtain optimal vibration force. In addition, more than one permanent magnet are arranged inside and outside the coil, respectively, so both the inner side and outer side of the coil are close to the permanent magnets. As a result of the arrangement, the vibration force resulting from interaction between electromagnetic force generated by the coil and the permanents magnets may be increased. In other words, it is possible to provide a high-performance bone conduction speaker with uniform resonant frequency characteristics by regulating the resonant frequency of the bone conduction speaker using the frequency regulating member and maximizing the vibration force by the arrangement of the multiple permanent magnets.

Description

Bone conduction speaker < RTI ID = 0.0 >

The present invention relates to a bone conduction speaker, and more particularly, to a bone conduction speaker capable of maximizing bone conduction efficiency, maintaining resonance frequency characteristics constant, reducing the size and weight, and simplifying manufacturing and cost. Further, the present invention can be also applied to mobile phones or wearable vibrators.

The vibration of the sound, normally transmitted to the air, is transmitted to the eardrum in the ear. There are three bones in the eardrum, and the vibration of the eardrum is transmitted through the bones to a threaded wah (cochlea). The wah has a liquid called lin - ba - ju, and the vibration of the liquid turns into an electric signal, which is transmitted to the auditory nerve. Thus, the human brain recognizes sound. Bone conduction (osteogenesis) omits the process of vibra- tion through the eardrum and osseol in the voice recognition mechanism. Send the vibration of the sound directly to the wah through the skull. Even those with hearing loss in the tympanic membrane or in the ossicles can hear the bone conduction reliably if the wah or auditory nerve is normal. The speaker that applies this principle is bone conduction speaker. A wide variety of bone conduction speakers are being developed, and most bone conduction speakers consist of a case, a permanent magnet, a coil, and an elastic member.

The vibrational force generated by the bone conduction speaker to transmit sound has the characteristic of generating the greatest vibration force at the resonant frequency. However, when the resonance frequency of the bone conduction speaker is out of the range of the frequency to be used, the vibration power is weakened and the sound transmission function can not be normally performed. Therefore, the resonance frequency characteristic of the bone conduction speaker must be made constant. However, in the conventional bone conduction speaker, even if the resonance frequency becomes distorted due to scattering and assembly tolerance of the constituent components, etc., it can not be adjusted.

SUMMARY OF THE INVENTION The present invention has been conceived in order to solve the problems of the conventional art described above, and it is an object of the present invention to provide a bone conduction speaker comprising a case, a supporting member, a permanent magnet, an elastic member, a coil, By changing the weight of the moving part, the resonance frequency of the bone conduction speaker can be adjusted so that the bone conduction speaker can operate at the resonance frequency, thereby ensuring the optimum vibration power.

The permanent magnets are disposed on the inner side and the outer side of the coils so that the inner and outer sides of the coils are arranged adjacent to the permanent magnets, so that the electromagnetic force generated in the coils and the permanent magnets And may increase the generated vibration force.

That is, a high performance bone conduction speaker having a constant resonance frequency characteristic by adjusting an oscillation frequency of a bone conduction speaker through a frequency adjusting member to generate an optimal oscillation force and arranging a plurality of permanent magnets to maximize a oscillation force, .

To achieve this object, there is provided a magnetic bearing device comprising: a casing defining a space therein; a support member disposed inside the casing; a permanent magnet having an inner space coupled to one side surface of the support member; An elastic member having one side fixed to the inside of the case and the other side connected to the supporting member, a coil wound around the permanent magnet, and a power source connected to the coil, Supply device.

The support member is preferably formed of a ferromagnetic material.

And an end of the support member may protrude in the movement direction.

A cover made of a ferromagnetic material may be formed on one side of the permanent magnet so as to seal the inner space of the permanent magnet.

Further, a cover made of a ferromagnetic material may be provided on one side of the permanent magnet, and a hole may be formed to connect the inner space and the outer space of the permanent magnet.

The plurality of permanent magnets may be disposed on the inner side and the outer side of the coil, respectively, but may be magnetized in opposite directions in the direction of motion.

The frequency adjusting member can be configured by adjusting the height or the size of the diameter.

In addition, the frequency adjusting member may be made of a material having a different specific gravity while maintaining a constant size.

The frequency adjusting member may be formed by applying a bond including metal powder to the inner space of the permanent magnet.

The features and advantages of the present invention will become apparent from the following detailed description based on the accompanying drawings. Prior to this, terms and words used in the present specification and claims should be construed in accordance with the spirit and scope of the present invention, on the basis of the principle that a concept of a term can be properly defined to explain it in a normal and best manner. .

According to the present invention, a frequency adjusting member is provided in the moving part to adjust the resonance frequency of the bone conduction speaker by changing the weight of the moving part so that the bone conduction speaker can operate at the resonance frequency, .

The permanent magnets are disposed on the inner side and the outer side of the coils so that the inner and outer sides of the coils are arranged adjacent to the permanent magnets, so that the electromagnetic force generated in the coils and the permanent magnets It is possible to increase the generated vibration force.

That is, it is possible to provide a high-performance bone conduction speaker in which the resonance frequency of the bone conduction speaker is adjusted through the frequency adjusting member to generate an optimum vibration force, and a plurality of permanent magnets are arranged to maximize the vibration power, .

1 is a cross-sectional view of a bone conduction speaker according to the present invention;
2 is an exploded perspective view of the bone conduction speaker according to the present invention.
3 is a view for explaining the effect of resonance frequency adjustment of the bone conduction speaker according to the present invention;
4 is a sectional view of a bone conduction speaker according to an embodiment of the present invention.
5 is a view showing an example of a process of applying a frequency adjusting member to a bone conduction speaker according to the present invention
6 is a view for explaining a fixing jaw provided in the bone conduction speaker according to the present invention;
Another embodiment of the bone conduction speaker according to the present invention
8 is a view for explaining the magnetization of the permanent magnet provided in the bone conduction speaker according to the present invention;

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

FIG. 1 is a cross-sectional view of a bone conduction speaker 100 according to the present invention, and FIG. 2 is an exploded perspective view of the bone conduction speaker 100. As shown in the figure, the bone conduction speaker 100 includes a case 111 forming a space therein, a support member 117 disposed inside the case 111, a support member 117 coupled to one side of the support member 117, A frequency adjusting member 119 disposed in an inner space of the permanent magnet 113; a fixed member 113 having one side fixed to the inside of the case 111 and another side fixed to the inside of the case 111; An elastic member 123 connected to the support member 117, a coil 125 surrounding a part of the permanent magnet 113, a power supply device connected to the coil 125 and coupled to the case 111 115).

When the permanent magnet 113 and the support member 117 are combined to constitute the moving unit 120 and power is applied to the coil 125 through the power supply unit 115 to generate an electromagnetic force, So that the moving part 120 moves upward or downward to generate vibration.

The support member 117 is formed of a ferromagnetic material to form a magnetic circuit, thereby preventing leakage of magnetic force generated in the permanent magnet 113 and increasing magnetic efficiency. In addition, when the end of the support member 117 is protruded in the direction of motion of the motion unit 120, a magnetic circuit is formed and the magnetic force generated by the coils 125 and the permanent magnets 113 The power can be increased.

One side of the elastic member 123 is fixed to the case 111 and the other side of the elastic member 123 is coupled to the support member 117 so that the coil 125 and the permanent magnets 113 and 114 And serves to increase the vibration power by resonance. The elastic member 123 can be fixed to the case 111 and the support member 117 by welding, bonding, caulking, or the like, and is preferably made of a metal having good elasticity.

The bone conduction speaker can maximize the force generated by the interaction of the electromagnetic force between the permanent magnet and the coil by the resonance of the elastic member to generate a large force. However, as shown in FIG. 3 (a), when the resonance frequency deviates from the frequency range used due to dispersion and assembly tolerances of the components of the bone conduction speaker, the vibration power becomes weak. As shown in FIG. 3 (b), if the resonance frequency of the bone conduction speaker can be adjusted to a frequency that uses the frequency, optimum vibration power can be achieved by compensating for such disadvantages.

The frequency adjusting member 119 is disposed inside the permanent magnet 113 to adjust the weight of the moving part 120 to adjust the resonance frequency of the bone conduction speaker 100 according to the present invention, The resonance frequency of the speaker 100 can be adjusted.

The relation between the resonance frequency and the weight of the bone conduction speaker can be expressed as follows.

Figure pat00001

In the above equation, it can be seen that the resonance frequency of the bone conduction speaker 100 can be adjusted by changing the weight of the motion unit 120.

The frequency adjusting member 119 is coupled to the inside of the permanent magnet 113 when adjustment of the resonance frequency is required due to assembly tolerance of the parts constituting the bone conduction speaker 100, The effect of adjusting the resonance frequency of the bone conduction speaker 100 can be obtained by changing the weight of the motion unit 120.

The weight of the frequency adjusting member 119 may be variously adjusted by adjusting the diameter or the height thereof to have a different volume or using different materials such as iron, tungsten, resin, or alloy having the same size and shape, The frequency adjusting member 119 of an appropriate weight can be selected and applied so that the bone conduction speaker 100 can have an optimal resonance frequency. Or tungsten may be mixed and applied to the bond to adjust the ratio of the metal powder or the weight of the metal powder may be adjusted by varying the amount of the metal powder.

That is, when a failure occurs in which the resonance frequency does not match the frequency used by the component and the assembly tolerance and the vibration power becomes small, the weight of the motion unit 120 is adjusted through the frequency adjusting member 119 to compensate the resonance frequency So that the bone conduction speaker 100 can operate at a resonance frequency, and an optimum vibration force can be generated, thereby stabilizing the quality of the bone conduction speaker 100.

The cover 121 may be disposed on the upper surface of the frequency adjusting member 119 to more firmly couple the frequency adjusting member 119. When the cover 121 is made of a ferromagnetic material, it is preferable that leakage of the magnetic force generated in the permanent magnet 113 is prevented to increase the vibration force generated in the coil 125 and the permanent magnet 113.

3 is a view for explaining the effect of adjusting the resonance frequency of the bone conduction speaker 100 according to the present invention.

FIG. 3 (a) shows the vibration acceleration with respect to the frequency of the bone conduction speaker. As shown in the figure, when the bone conduction speaker generates the maximum vibration acceleration G0 at the resonance frequency f0 and the input frequency f1, f1 becomes larger or smaller than the resonance frequency f0, the vibration acceleration G1 becomes resonant Becomes weaker than the vibration acceleration (G0) generated at the frequency (f0).

3 (b) shows the vibration acceleration () of the bone conduction speaker 100 with respect to the frequency before the resonance frequency adjustment and the vibration acceleration () with respect to the frequency after the adjustment. When the resonance frequency f0 of the bone conduction speaker 100 does not match the frequency f2 at which the bone conduction speaker 100 is used due to scattering or assembly tolerance of the components, vibrations occurring at the resonance frequency f0 The vibration acceleration G2 performance smaller than the acceleration G0 can not be used due to the poor power performance. At this time, when the weight of the motion unit 120 is increased by coupling the frequency adjusting member 119, the resonance frequency of the bone conduction speaker 100 is lowered so that the resonance frequency f0 of the bone conduction speaker 100 is used And the maximum vibration acceleration G0 can be generated at the frequency f2.

That is, when the frequency to be used is equal to the resonance frequency, the bone conduction speaker generates the maximum vibration acceleration. Therefore, when the resonance frequency deviates from the frequency to be used due to component scattering and assembly tolerance of the bone conduction speaker, By adjusting the resonance frequency to be equal to the frequency to be used, the bone conduction speaker can achieve the optimum performance.

FIG. 4 shows an embodiment of the frequency adjusting member 119 in the bone conduction speaker 100 according to the present invention.

As shown in FIG. 4 (a), the frequency adjusting member 119 using the same raw material has the same height but different diameters by changing the volume so that the weight of the frequency adjusting member 119 is made different, The resonance frequency of the resonator 100 can be adjusted in several steps. When the frequency adjusting member 119 has the same height, the cover 121 is brought into contact with the cover 121 to directly support the frequency adjusting member 119, so that the cover 121 can be firmly assembled.

FIG. 4 (b) shows that the frequency adjusting members 119 using the same raw material have the same diameter but different heights to make up different volumes. The inner side surface of the permanent magnet 113 and the side surface of the frequency adjusting member 119 may be uniformly assembled so that the assembling position of the frequency adjusting member 119 Can be easily assembled without turning.

FIG. 4 (c) shows that the size of the frequency adjusting member 119 is made uniform and the weight is made different from that of a material having a different specific gravity. The frequency adjusting member 119 may be made of iron, tungsten, aluminum, resin, alloy, or the like, and may have various weights. In addition, the frequency adjusting member 119 may be formed of an injection molded product, and may include a metal powder or a metal piece having a large specific gravity, and may have various proportions of metal components to vary the weight. Since the diameter of the frequency adjusting member 119 is the same, the permanent magnet 113 can be uniformly assembled in the inner space of the permanent magnet 113, and the jig for assembling can be simplified because the size is constant. Also, since the cover 121 is in contact with the cover 121, the cover 121 can directly support the frequency adjusting member 119 and can be firmly assembled.

4 (d) shows that the frequency adjusting member 119 is formed by mixing and applying metal powder to the bond. At this time, the weight of the frequency adjusting member 119 can be varied by adjusting the amount of metal powder mixed in the bond. The amount of the metal powder may be made the same, but the weight of the frequency adjusting member 119 may be changed by changing the application amount.

5 is an embodiment of a process of applying the frequency adjusting member 119 of the bone conduction speaker 100 according to the present invention.

5 (a), the bone conduction speaker 100 is assembled except for the frequency adjusting member 119 and the cover 121, and its performance is checked. When the resonance frequency characteristic is out of the range of good products The stator 130 constituted by the coil 125 and the power supply unit 115 is separated and the frequency adjusting member 119 having a weight capable of adjusting the resonance frequency characteristic of the normal range is selected, 113, and then the cover 121 and the stator 130 are coupled to complete the assembly.

5 (b) shows a case where the cover 121 is made of a ferromagnetic material to prevent leakage of magnetic force generated in the permanent magnet 113 and to prevent leakage of the magnetic force generated in the coil 125 and the permanent magnet 113 A hole is formed in the cover 121 so that the inner space of the permanent magnet 113 is connected to the outer space, thereby simplifying the process of adding the frequency adjusting member 119.

As shown in FIG. 1, when assembling the bone conduction speaker 100, only the frequency adjusting member 119 is assembled, and the performance of the assembly is checked to separate the stator 130 of a product whose resonance frequency characteristic is out of the good range. After assembling the frequency adjusting member 119, the stator 130 is coupled to complete the assembly. In this case, since the cover 121 is assembled in the performance testing process, when the frequency characteristic is in the good range, it is not necessary to perform additional steps to assemble the cover 121, This reduction can simplify the process. Further, since the performance of the cover 121 is tested in the assembled state, there is no defect that can be generated in the final assembly due to the size of the cover 121 or the deformation due to scattering and assembly tolerance of the material, The cause of defects is reduced.

As described above, the bone conduction speaker 100 according to the present invention can adjust the resonance frequency according to the characteristics of the product after performing the performance test so that the final product can operate at the resonance frequency, The resonance frequency defects can be improved.

6 is another embodiment of the support member 117 provided in the bone conduction speaker 100 according to the present invention. As shown in the figure, a fixing jaw 127 is provided on a part of a side surface of the support member 117 which is coupled with the permanent magnet 113, so that when the support member 117 and the permanent magnet 113 are engaged, And the durability of the bone conduction speaker 100 can be increased.

FIG. 7 illustrates another embodiment of a bone conduction speaker 100 according to the present invention. As shown in the figure, the permanent magnet 113 is composed of a plurality of permanent magnets 113 disposed on the inner side and the outer side of the coil 125 so that both the inner side and the outer side of the permanent magnet 113 It is possible to maximize the electromagnetic force generated by the coil 125 and the vibration force generated by the interaction of the permanent magnets 113. [

When a yoke 122 formed of a ferromagnetic material is coupled to the upper surface of the permanent magnet 113 surrounding the coil 125, magnetic leakage of the permanent magnet is prevented and a magnetic circuit is formed, The vibrating force of the speaker 100 can be maximized.

FIG. 8 shows a magnetizing direction of the permanent magnet 113 provided in the bone conduction speaker 100 according to the present invention. As shown in the figure, it is preferable that the permanent magnet 113 is magnetized in the same direction as the motion direction of the motion unit 120.

When a plurality of the permanent magnets 113 are formed, the electromagnetic force generated by applying power to the coils 125 is generated in opposite directions from the inside and outside of the coils 125, The magnetization directions of the permanent magnets 113 disposed inside and outside the coil 125 are preferably formed in directions opposite to each other.

While the invention has been shown and described with reference to certain embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention .

100: bone conduction speaker 111: case
113: permanent magnet 115: power supply
117: support member 119: frequency adjusting member
120: moving part 121: cover
122: yoke 123: elastic member
125: coil 127: fixed jaw
130: stator

Claims (9)

A case defining a space therein;
A support member disposed inside the case;
A permanent magnet coupled to one side of the support member and having an inner space;
A frequency adjusting member disposed in an inner space of the permanent magnet;
An elastic member having one side fixed to the inside of the case and the other side connected to the supporting member;
A coil surrounding the part of the permanent magnet;
And a power supply coupled to the coil and coupled to the case.
The method according to claim 1,
Characterized in that the support member is formed of a ferromagnetic body
The method according to claim 1,
And an end of the supporting member protrudes in a moving direction.
The method according to claim 1,
Wherein a cover made of a ferromagnetic material is formed on one side of the permanent magnet and the inner space of the permanent magnet is closed.
The method according to claim 1,
Wherein a hole made of a ferromagnetic material is formed on one side of the permanent magnet so that an inner space of the permanent magnet and an outer space are connected to each other.
The method according to claim 1,
Wherein the permanent magnets comprise a plurality of magnetic poles and are magnetized in directions opposite to each other in the direction of motion while being disposed inside and outside the coil,
The method according to claim 1,
Characterized in that the frequency adjusting member is configured by adjusting the height or diameter of the bone conduction speaker
The method according to claim 1,
Characterized in that the frequency adjusting member is made of a material having a different specific gravity while maintaining a constant size.
The method according to claim 1,
Wherein the frequency adjusting member is formed by applying a bond including metal powder to the inner space of the permanent magnet.
KR1020140083502A 2014-07-04 2014-07-04 Bone conduction speaker KR20160004693A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102016672B1 (en) * 2018-09-03 2019-08-30 주식회사 엠플러스 Sound vibration actuator
WO2020096356A1 (en) * 2018-11-06 2020-05-14 경북대학교 산학협력단 Bone conduction vibration transducer
KR20200102858A (en) * 2019-02-22 2020-09-01 (주)파트론 Vibration motor
WO2023036303A1 (en) * 2021-09-10 2023-03-16 苏州索迩电子技术有限公司 Vibration device, bone conduction earphone, wearable apparatus, and intelligent hardware apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102016672B1 (en) * 2018-09-03 2019-08-30 주식회사 엠플러스 Sound vibration actuator
WO2020096356A1 (en) * 2018-11-06 2020-05-14 경북대학교 산학협력단 Bone conduction vibration transducer
KR20200102858A (en) * 2019-02-22 2020-09-01 (주)파트론 Vibration motor
WO2023036303A1 (en) * 2021-09-10 2023-03-16 苏州索迩电子技术有限公司 Vibration device, bone conduction earphone, wearable apparatus, and intelligent hardware apparatus

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