KR101389691B1 - Bone conduction speaker unit for reducing noise by magnet fluid - Google Patents

Abstract

The present invention relates to a bone conduction speaker unit reducing noises by magnetic fluid. The purpose of the present invention is to provide the bone conduction speaker unit minimizing the noises by the magnetic fluid, capable of minimizing the power consumption of a bone conduction earphone and removing contact noises when the bone conduction earphone is operated. The bone conduction speaker unit reducing the noises by the magnetic fluid improves a frequency response in a low frequency band and a high frequency band.

Description

Bone conduction speaker unit which reduced noise with magnetic fluid {BONE CONDUCTION SPEAKER UNIT FOR REDUCING NOISE BY MAGNET FLUID}

The present invention relates to a bone conduction speaker unit in which noise is reduced by magnetic fluid. More particularly, the present invention relates to a bone conduction speaker unit, in which noise is reduced by magnetic fluid that transmits a vibration corresponding to a voice signal to a skull so that a user can recognize a sound. A bone conduction speaker unit.

In general, as portable electronic devices such as portable radios, MP3 players, mobile phones, PDAs, and notebook computers are made smaller and lighter, portable electronic devices become easier to carry.

On the other hand, as described above, in order to listen to audio information without damaging the surrounding people using portable electronic products, the use of earphones or headphones equipped with a micro speaker is essential, and thus the use of the micro speaker is gradually increased. Doing.

However, conventionally, the micro speaker inserted into the ear canal not only can permanently damage the eardrum when the volume is too high, but also has a problem that a person with a hearing impairment cannot use it.

In order to improve such a problem, a bone conduction speaker has been developed and applied to a language speaker such that a sound source generator is brought into contact with a listener's skin and then mechanical vibration is directly transmitted to a bone so that the user can hear the sound.

However, the conventional bone conduction earphone has a problem in that the magnetic force is weak because only one magnet is used, and thus, a large amount of current must be sent to the voice coil, thereby increasing power consumption of the audio device.

In addition, the conventional bone conduction earphone has a problem that the vibrating body vibrating in the vertical direction hits the inner wall of the case to generate a contact noise, the vibration body vibrating in the vertical direction is deflected to one side there is a problem that one side vibration.

In addition, the conventional bone conduction earphone has a problem that the structure of the elastic member is unstable, and the frequency response in the low frequency band and the high frequency band is inferior.

Meanwhile, the prior art of the present invention includes the "bone conduction speaker" of the application number "10-2004-7019160", the "micro speaker for sound and vibration generation" of the application number "10-2005-0015033", and the application number " 10-2005-0090142 "," Bone Conduction Speakers ".

In order to solve the above problems, the present invention minimizes the power consumption of the bone conduction earphones, and minimizes the noise as a magnetic fluid capable of removing the contact noise generated when the bone conduction earphones are driven. It is an object of the present invention to provide a unit.

In addition, the present invention provides a bone conduction speaker unit by reducing the noise with a magnetic fluid to stably design the elastic member to suppress the oscillation of bone conduction earphones, and to improve the frequency response in the low frequency band and high frequency band There is another object of the present invention.

The bone conduction speaker unit which reduces noise with the magnetic fluid according to the present invention for achieving the above object is a hollow three-dimensional shape, the bottom of the case is open, a bracket for closing the open bottom of the case, installed inside the case PCB that receives voice signals from the outside of the case, a coil that is soldered on the PCB disposed inside the case and generates a magnetic field according to the voice signal transmitted from the PCB, and is installed inside the case to interact with the magnetic field generated from the coil. It consists of a vibrating body vibrating in the up and down direction, the vibrating body is a yoke spaced apart a predetermined distance in the upper direction of the coil, the upper surface is fixedly coupled to the center of the yoke and the body is fixed to the coil into the coil into the body An inner magnet to generate a ring (Ring) form of the yoke An external magnet fixedly coupled to the bottom and installed in an outer direction of the coil to generate a fixed magnetic field with respect to the coil together with an internal magnet, and mounted to the bottom of the inner magnet facing the coil to lose a magnetic field generated inside the case. The inner plate which prevents the magnetic field generated from the inside of the case from being concentrated to the coil, and is fixedly coupled to the upper surface of the yoke and separated from the upper surface of the case by a predetermined distance, and the edge is fixed to the inner wall of the case so that the voice signal An elastic member vibrating elastically together with an inner magnet, an inner magnet, an outer magnet and an inner plate when it comes in, and an elastic member mounted on the upper surface of the elastic member facing the case and vibrated in an up and down direction are provided with the case. Magnetic oil cushions shocks when encountered When the voice signal enters the coil, the variable magnetic field generated from the coil reacts with the fixed magnetic field generated from the inner magnet and the outer magnet to vibrate the vibrating body in the up and down directions, and the magnetic fluid is an elastic member. Contact noise can be reduced by cushioning the collision between the case and the case.

The bone conduction speaker unit which reduces noise with the magnetic fluid according to the present invention having such a structure can reduce the current flowing into the voice coil by increasing the magnet inside the case to increase the magnetic force and consequently the audio device for driving the bone conduction speaker. Can minimize the power.

In addition, by attaching a magnetic fluid to one side of the elastic member facing the inner wall of the case to prevent a collision between the elastic member and the case it can reduce the contact noise that may be generated in the bone conduction speaker.

In addition, the present invention can stably design the elastic member to suppress the oscillation of the bone conduction earphone, and can improve the frequency response in the low frequency band and high frequency band.

1 is a perspective view of a first embodiment of the present invention,
2 is an exploded view of a first embodiment of the present invention;
3 is a longitudinal cross-sectional view of a first embodiment of the present invention;
4 is a view for explaining an elastic member provided in the first embodiment of the present invention;
5 is a longitudinal cross-sectional view of a second embodiment of the present invention;
6 is a view for explaining the elastic member provided in the second embodiment of the present invention.

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

As shown in FIGS. 1, 2, and 3, the bone conduction speaker unit having reduced noise with the magnetic fluid according to the present invention has a hollow three-dimensional shape with a case 1 having an open bottom, and the case 1. Bracket (3) for closing the open bottom of the case, PCB (5) installed inside the case (1) and receiving a voice signal from the outside of the case (1), PCB (5) disposed inside the case (1) Coil 7 which is soldered on and generates a magnetic field according to the voice signal transmitted from PCB 5 and installed inside the case 1 and interacts with the magnetic field generated by coil 7 in the up and down direction. It may consist of a vibrating vibrating body.

The vibrating body has a yoke 11 spaced a predetermined distance in the upper direction of the coil (7), the upper surface is fixedly coupled to the center of the yoke (11) and the body enters into the coil (7) with respect to the coil (7) An inner magnet 13 generating a fixed magnetic field and a ring shape are fixedly coupled to the bottom surface of the yoke 11 and installed in an outer direction of the coil 7 to form a coil together with the inner magnet 13. 7) is mounted on the bottom of the outer magnet (15), the inner magnet 13 facing the coil (7) generating a fixed magnetic field to prevent the magnetic field generated inside the case (1) is lost (1) the inner plate 17 to concentrate the magnetic field generated inside the coil (7), and fixedly coupled to the upper surface of the yoke 11, a predetermined distance apart from the inner upper surface of the case (1), the edge is the case The nose is fixed to the inner wall of (1) Yoke 11 integrally coupled to the voice signal when the voice signal (7), and the elastic member 19 to vibrate elastically with the inner magnet 13, the outer magnet 15 and the inner plate 17, and The elastic member 19 mounted on the upper surface of the elastic member 19 facing the case 1 may be made of a magnetic fluid 21 that cushions an impact when the elastic member 19 oscillates in the vertical direction. have.

According to the present invention having the above structure, the variable magnetic field generated from the coil 7 reacts with the fixed magnetic field generated from the inner magnet 13 and the outer magnet 15 when a voice signal is input to the coil 7. By vibrating the vibrating body in the vertical direction, the magnetic fluid 21 can reduce the contact noise by buffering the collision between the elastic member 19 and the case (1).

In addition, as shown in FIGS. 2 and 3, the outer surface of the outer magnet 15 is formed in a ring shape and is mounted on the lower surface of the outer magnet 15 facing the coil 7. The outer plate 23 is mounted to prevent the magnetic field generated inside the case 1 from being lost and to concentrate the magnetic field generated inside the case 1 into the coil 7.

As shown in FIG. 4, the elastic member 19 is formed in a ring shape, the fixing ring 25 having an edge fixed to an inner wall of the case 1, and an outer diameter of the fixing ring 25. A vibration plate 27 which is smaller than an inner diameter and is inserted into the fixing ring 25 and whose bottom is fixedly coupled to an upper surface of the yoke 11, and between the fixing ring 25 and the vibration plate 27. ) And the vibration plate 27 may be composed of a connection bridge 29 to elastically hold and secure.

When the voice signal is input to the coil 7, the elastic member 19 has a vibration plate 27 integrally coupled with the yoke 11 with respect to the fixing ring 25 fixed to the case 1 in the vertical direction. Vibrate.

In addition, the upper surface of the yoke 11 facing the elastic member 19, as shown in Figure 5 and 6, is provided with a projection jaw 31 protruding in the upper direction of the yoke 11, the vibration The plate 27 is provided with a through hole 33 so that the through hole 33 is engaged with the protruding jaw 31.

The structure as described above facilitates the assembly of the elastic member 19 and the yoke 11, and the elastic member 19 and the yoke 11 to be concentric to prevent the vibration of the vibrating body, the magnetic fluid 21 ) So that it is in position.

The elastic member 19 determines the resonance frequency of the speaker while amplifying the vibration.

In addition, the bottom surface of the yoke 11 to which the inner magnet 13 is coupled is configured to enter concavely, as shown in FIGS. 3 and 5 so that the inner magnet 13 is seated in position to achieve concentricity. By increasing the size of the internal magnet 13, the magnetic force inside the case 1 can be increased.

3 and 5, an inner side surface of the case 1 is provided with an annular jaw 35 in the circumferential direction of the case 1, and the fixing ring 25 of the elastic member 19 is provided. ) Is fixed over the annular jaw 35.

The bone conduction speaker unit having the noise reduced to the magnetic fluid according to the present invention having the structure as described above, as shown in FIGS. 1 to 6, when a current flows in either direction in the coil 7, an inner / outer magnet Due to the action of the magnetic field of 15 and the magnetic field generated from the coil 7, the vibrating body is raised.

On the other hand, when the current in the opposite direction flows to the coil 7, the vibrating body is lowered.

At this time, the amount of current flowing through the coil 7 determines the strength of the magnetic field and adjusts the degree of vibration of the vibrating body. When the voice signal voltage is applied to the coil 7, the direction and the intensity of the current are proportional to the voice signal voltage. And the vibrating body is vibrated at a varying intensity and ratio.

In addition, the vibrating body transmits a vibration corresponding to the voice signal through the skull to the cochlea, the lymphatic fluid of the cochlea causes a wave.

These movements are also sensed by auditory cells, reached through the auditory nerve to the brain, and perceived as sound.

The bone conduction speaker unit which has reduced noise with the magnetic fluid according to the present invention having such a structure can reduce the current flowing into the voice coil 7 by increasing the magnetic force by increasing the magnet inside the case 1 and consequently the bone conduction. The power of the audio device driving the speaker can be minimized.

In addition, the magnetic fluid 21 may be attached to one side of the elastic member 19 facing the inner wall of the case 1 to prevent a collision between the elastic member 19 and the case 1. Contact noise can be reduced.

In addition, the present invention can stably design the elastic member 19 to suppress the oscillation of the bone conduction earphone, and can improve the frequency response in the low frequency band and the high frequency band.

1. Case 3. Bracket
5. PCB 7. Coil
11. Yoke 13. Internal magnet
15. Outer magnet 17. Inner plate
19. Elastic member 21. Magnetic fluid
23. Outer plate 25. Retaining ring
27. Vibration plate 29. Connecting bridge
31. Protruding jaw 33. Through hole
35. Annular Jaw

Claims (6)

A case 1 whose bottom surface is open as a hollow three-dimensional shape;
A bracket 3 for closing the open bottom surface of the case 1;
A PCB 5 installed inside the case 1 to receive a voice signal from outside the case 1;
A coil 7 soldered onto the PCB 5 disposed inside the case 1 and generating a magnetic field in accordance with a voice signal transmitted from the PCB 5;
It is made of a vibrating body which is installed inside the case 1 and vibrates in the vertical direction by interacting with the magnetic field generated from the coil (7),
The vibrating body is a yoke 11 spaced apart a predetermined interval in the upper direction of the coil (7),
An inner magnet 13 having an upper surface fixedly coupled to the center of the yoke 11 and a body entering the coil 7 to generate a magnetic field fixed with respect to the coil 7,
An external magnet is formed in a ring shape and fixedly coupled to the bottom of the yoke 11 and installed in an outward direction of the coil 7 to generate a fixed magnetic field with respect to the coil 7 together with the internal magnet 13. 15,
It is mounted on the bottom surface of the inner magnet 13 facing the coil 7 to prevent the magnetic field generated inside the case 1 to be lost and to concentrate the magnetic field generated inside the case 1 to the coil 7. Inner plate (17),
It is fixedly coupled to the upper surface of the yoke 11 and spaced apart from the inner top surface of the case 1, the edge is fixed to the inner wall of the case 1 is integrally coupled when the voice signal enters the coil 7 An elastic member 19 which vibrates elastically with the yoke 11, the inner magnet 13, the outer magnet 15 and the inner plate 17,
And a magnetic fluid 21 which is mounted on the upper surface of the elastic member 19 facing the case 1 to cushion the impact when the elastic member 19 oscillates in the vertical direction. ,
When the voice signal enters the coil 7, the variable magnetic field generated from the coil 7 reacts with the fixed magnetic field generated from the inner magnet 13 and the outer magnet 15 to move the vibrating body in the vertical direction. Vibrates, the magnetic fluid 21 buffers a collision between the elastic member 19 and the case 1 to reduce contact noise,
The bottom surface of the yoke 11 to which the inner magnet 13 is coupled is configured to be concave so that the inner magnet 13 may be seated in position to achieve concentricity, and the size of the inner magnet 13 may be increased. 1) A bone conduction speaker unit which reduces noise with magnetic fluid, characterized by increasing internal magnetic force.
The method of claim 1,
A bottom of the outer magnet 15 is formed in a ring shape, and a magnetic field generated inside the case 1 is lost in a state in which it is mounted on the bottom of the outer magnet 15 facing the coil 7. To reduce the noise and reduce the noise with the magnetic fluid, characterized in that the outer plate 23 for mounting the magnetic field generated inside the case (1) is concentrated to the coil (7).
delete The method of claim 1,
The elastic member 19 is formed in a ring (Ring) shape and the edge is fixed to the inner wall of the case (1) (25);
An outer diameter smaller than the inner diameter of the fixing ring 25 is inserted into the fixing ring 25, and a bottom plate fixedly coupled to the upper surface of the yoke 11;
When the voice signal is input to the coil 7 consists of a connecting bridge 29 for holding the fixing ring 25 and the vibrating plate 27 elastically between the fixing ring 25 and the vibration plate 27, the case A bone conduction speaker unit having reduced noise with magnetic fluid, characterized in that the vibrating plate (27) integrally coupled with the yoke (11) vibrates in the vertical direction with respect to the fixing ring (25) fixed to (1).
5. The method of claim 4,
The upper surface of the yoke 11 facing the elastic member 19 is provided with a protruding jaw 31 protruding in the upper direction of the yoke 11,
The vibrating plate (27) is provided with a through hole (33), the through hole (33) is a bone conduction speaker unit which reduces noise with magnetic fluid, characterized in that the engaging jaw (31).
5. The method of claim 4,
The inner side of the case 1 is provided with an annular jaw 35 in the circumferential direction of the case 1,
The fixing ring 25 of the elastic member 19 is fixed to the annular jaw (35) characterized in that the bone conduction speaker unit reduced noise with magnetic fluid.

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