KR20230089355A - A bone conduction speaker - Google Patents

Abstract

The present invention relates to a bone conduction speaker which comprises: a housing in which a receiving space is formed; a yoke installed in the receiving space of the housing and having the shape of a container; a magnet installed on the upper part of the yoke; a magnet support part installed on the upper part of the magnet; a coil surrounding the magnet support part; a yoke cover disposed to surround the yoke; and a suspension connecting the yoke and the housing within the housing. The suspension has an integrated circular ring shape which forms a plane, has a hollow formed therein, and has a predetermined width, and includes an inner ring part adjacent to the hollow and extending in the circumferential direction of the hollow, an outer ring part forming the outer periphery, and a bridge part connecting the inner ring part and the outer ring part. The bridge part is arranged in four sets at equal intervals in the circumferential direction and each set includes a connection bridge extending in the circumferential direction. Accordingly, a resonance frequency of 100 Hz or less is achieved, thereby enabling a patient with hearing loss to smoothly recognize low-pitched sounds.

Description

Bone conduction speaker {A BONE CONDUCTION SPEAKER}

The present invention relates to a bone conduction speaker, and relates to a bone conduction speaker, in which a resonant frequency is within a predetermined range to improve sound quality in a low-pitched range for a hearing-impaired patient so as not to cause discomfort in use.

In general, sound entered through the ear canal of the ear passes through the eardrum and is converted into an electrical signal in the cochlea and transmitted, thereby recognizing and hearing the sound.

However, in the case of hearing loss due to various diseases such as eardrum damage or otitis media, acoustic trauma caused by extreme noise, or aging, such a general sound transmission mechanism is destroyed, making it difficult to hear sound.

A hearing loss patient whose sound transfer mechanism is damaged as described above is usually assisted in recognizing sound by wearing a hearing aid.

The hearing aid is divided into an airway hearing aid that is inserted into the ear and a bone conduction hearing aid that transmits vibration through bones. The airway hearing aid recognizes sound by vibrating air, whereas the bone conduction hearing aid vibrates the temporal bone surrounding the cochlea to stimulate the auditory nerve. through the perception of sound.

Airway hearing aids can be applied to patients with no abnormalities in the external auditory canal and problems with the cochlea or auditory nerve, while airway hearing aids are suitable for patients with conductive hearing loss, such as perforation of the eardrum or leakage of exudate in the middle ear cavity, congenital external ear anomalies, severe chronic otitis media, or severe unilateral deep hearing loss. is difficult and requires the use of a bone conduction hearing aid.

1 shows a bone conduction speaker according to the prior art, and a yoke 11, a magnet 12, a voice coil 13, a lower diaphragm 14, a vibration spring 15, and an upper part inside a body 10. The diaphragm 16 is formed sequentially from bottom to top.

Here, the yoke 11 and the magnet 12, which are relatively heavy in weight, are disposed under the body 10, and the voice coil 13, which is relatively light in weight, the lower diaphragm 14, the vibration spring 15, and The upper diaphragm 16 is disposed above the body 10.

When an electrical signal is input to the signal input unit 17, vibration is sequentially transmitted from the voice coil 13 to the lower diaphragm 14, the vibration spring 15, and the upper diaphragm 16, and the upper diaphragm ( The vibration of 16) stimulates the auditory nerve of the human body through the skull of the user, so that sound can be heard.

However, in the case of the prior art, since hard bones must be vibrated and various voice components are canceled while passing through the bones, low-pitched sound performance is poor, making it very uncomfortable to hear.

Korean Registered Patent Publication No. 10-2167455 (2020.10.13)

The present invention has been made to solve the problems of the prior art, and an object of the present invention is to provide a bone conduction speaker that achieves a resonance frequency of 100 Hz or less so that patients with hearing loss can smoothly recognize low-pitched sounds. there is.

In order to achieve the above object, a bone conduction speaker according to the present invention,

a housing in which an accommodation space is formed;

A yoke installed in the accommodation space of the housing and having a container shape;

A magnet installed on top of the yoke;

a magnet support part installed on top of the magnet;

a coil surrounding the magnet support;

a yoke cover disposed to surround the circumference of the yoke; and

a suspension connecting the yoke and the housing within the housing;

Including,

The suspension is made of an integral circular annular shape having a flat surface, a hollow formed, and a constant width, an inner ring portion adjacent to the hollow and extending in the circumferential direction of the hollow, an outer ring portion forming an outer circumference, and It includes a bridge portion connecting the outer ring portion, and four sets of the bridge portion are arranged at equal intervals along the circumferential direction, and each set includes a connecting bridge extending along the circumferential direction.

The bridge part,

A first connection body extending radially from the outer ring portion toward the inner ring portion;

a second connection body extending radially from the inner ring portion toward the outer ring portion; and

a connection bridge connecting the first connection body and the second connection body and extending with a gap formed between the outer ring portion and the inner ring portion, respectively;

It is characterized in that it is configured to include.

Along the circumferential direction, the connection bridge is characterized in that it includes a corrugated region having a shape in which a radial width gradually decreases from both ends toward the center.

The angle of the wave area is characterized in that it is in the range of 40 degrees to 80 degrees with respect to the center of the circle.

The inner circumferential diameter of the inner ring portion has dimensions of 8.85 ± 0.03 mm, the outer circumferential diameter of the outer ring portion has dimensions of 12.25 ± 0.03 mm, and the minimum width of the connecting bridge is in the range of 0.3 mm to 0.6 mm.

The inner circumferential diameter of the inner ring portion is 8.85 ± 0.03 mm, the outer circumferential diameter of the outer ring portion has dimensions of 12.25 ± 0.03 mm, and the thickness of the bridge portion is characterized in that in the range of 0.06 mm ~ 0.3 mm.

It is characterized in that the wave area is composed of 70 degrees with respect to the center of the circular shape, the minimum width of the connection bridge is 0.3 mm, and the thickness of the bridge portion is 0.09 mm.

The housing is composed of a container-shaped accommodating portion and a circuit board portion covering the opening of the accommodating portion and applying a DSP (Digital Signal Processing) circuit, and a coil is installed on one side of the circuit board portion facing the accommodating portion. .

In addition, the bone conduction speaker according to the present invention is characterized by including a function of adjusting the electromagnetic force.

According to the present invention having the configuration as described above, the suspension is formed in a flat shape, a hollow is formed, and is formed in an integral circular annular shape having a constant width, and the inner ring portion adjacent to the hollow and extending in the circumferential direction of the hollow, the outer circumference It includes an outer ring portion forming an outer ring portion and a bridge portion connecting the inner ring portion and the outer ring portion, and four sets of the bridge portions are arranged spaced apart at equal intervals along the circumferential direction, and each set is connected to extend along the circumferential direction. Since it is characterized by including a bridge, it is possible to achieve a resonant frequency of 100 Hz or less so that patients with hearing loss can smoothly recognize low-pitched sounds.

In addition, according to the present invention, the bridge portion, the first connecting body extending radially from the outer ring portion toward the inner ring portion, the second connecting body extending radially from the inner ring portion toward the outer ring portion, and the first connecting body and Since it is characterized in that it comprises a connection bridge that connects the second connection body and extends in a state in which a gap is formed between the outer ring portion and the inner ring portion, respectively, the resonant frequency is maintained below the reference value to improve audible sound quality There is also an advantage that durability can be greatly increased by maintaining response displacement and maximum stress below the reference value.

In addition, according to the present invention, since the connecting bridge is characterized in that it includes a corrugated area of a shape in which the width in the radial direction gradually decreases from both ends toward the center along the circumferential direction, while maintaining durability, generated from a vibrator such as a yoke It also has the advantage of being able to physically and flexibly support vibration.

1 is a longitudinal cross-sectional view showing the structure of a bone conduction speaker according to the prior art.
2 is a perspective view showing the structure of a bone conduction speaker according to the present invention.
3 is a longitudinal cross-sectional view showing the structure of a bone conduction speaker according to the present invention.
4 is an exploded perspective view showing the structure of a bone conduction speaker according to the present invention.
Figure 5a is a perspective view showing the structure of the suspension in Figure 4;
Figure 5b is a plan view showing the structure of the suspension in Figure 4;
Figure 6a is a graph showing the main effect diagram for the resonant frequency of the suspension structure according to the present invention.
6B is a graph showing a main effect diagram for response displacement of a suspension structure according to the present invention.
6C is a graph showing a main effect diagram for the maximum stress of the suspension structure according to the present invention.
7 is a graph showing SPL characteristics of a bone conduction speaker when a suspension according to the present invention is applied.
8 is a perspective view showing the stress distribution in the primary resonance mode of the suspension according to the present invention.
9 is a diagram illustrating a resonance mode of a suspension according to the present invention.

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

2 to 4, the bone conduction speaker 1000 according to the present invention is installed in a housing 100 in which an accommodation space 110 is formed and an accommodation space 110 of the housing 100. A yoke 200 having a concave container shape, a magnet 300 installed on the upper portion of the concave portion of the yoke 200, a magnet support 400 installed on the upper portion of the magnet 300, and the housing 100 The coil 500 constituting the stator and surrounding the magnet support part 400 in a fixed state, the yoke cover 600 disposed to surround the circumference of the yoke 200, and the yoke within the housing 100 A suspension 700 connecting between the 200 and the housing 100 is included.

The housing 100 may include a container-shaped accommodating portion 120 accommodating various components and a circuit board portion 130 covering an opening of the accommodating portion 120 .

In particular, the suspension 700, which is a key part that affects the resonance frequency of the bone conduction speaker 1000, is made of a flat metal, has a hollow 710, and is formed in an integral circular annular shape with a constant width. , The inner ring portion 720 adjacent to the hollow 710 and extending in the circumferential direction of the hollow 710, the outer ring portion 730 forming the outer circumference, and connecting the inner ring portion 720 and the outer ring portion 730. Four sets of bridge parts 740 are spaced apart at equal intervals along the circumferential direction, and each set includes connection bridges 743 extending along the circumferential direction. do.

In the drawing, the inner ring portion 720 of the suspension 700 is interposed between the flange 210 of the yoke 200 and the yoke cover 600, and the outer ring portion 730 is the receiving portion 120 of the housing 100 It is fixed on the inner side.

Specifically, a coupling groove 150 concave in the circumferential direction is formed on the inner surface of the receiving portion 120 of the housing 100, and an annular fitting ring 140 is detachably coupled to the coupling groove 150. Thus, the outer ring portion 730 of the surf suspension 700 is interposed between the fitting ring 140 and the coupling groove 150, and the circuit board portion 130 is also coupled to the coupling groove with the fitting ring 140. It is configured to be fitted into (150).

The inner ring portion 720 is connected to the yoke 200 corresponding to the vibrator, and the outer ring portion 730 is connected to the housing 100 so that the vibrating yoke 200 is elastic with respect to the housing 100. It acts as a buffer and support.

The yoke 200 and the yoke cover 600 are disposed spaced apart from the bottom of the accommodating part 120 .

In addition to the yoke 200, the magnet 300 functions as a vibrator.

The suspension 700 may be made of metal such as stainless steel, beryl copper, brass or phosphor bronze.

As a result of the experiment, when the bridge part 740 is composed of 3 sets or less, there is a disadvantage in that the mechanical strength is lowered and the durability is lowered, and when the bridge part 740 is composed of 5 sets or more, there is a disadvantage in that the resonance frequency greatly exceeds 100 Hz, according to the present invention The bridge parts 740 are fixedly arranged in four sets.

In addition, the bridge portion 740 includes a first connection body 741 extending radially from the outer ring portion 730 toward the inner ring portion 720, and from the inner ring portion 720 toward the outer ring portion 730. A second connection body 742 extending in the radial direction and a gap 750 between the outer ring portion 730 and the inner ring portion 720 connecting the first connection body 741 and the second connection body 742 ) It is configured to include a connection bridge 743 extending in the form of a state.

The first connection body 741 and the second connection body 742 serve as a kind of support to improve durability by maintaining mechanical strength.

In addition, since the connection bridge 743 has a certain width and is connected between the first connection body 741 and the second connection body 742, the response displacement and maximum stress can be adjusted to a reference value or less.

In particular, along the circumferential direction, the connection bridge 743 includes a corrugated area 743a having a shape in which the width in the radial direction gradually decreases from both ends toward the center, so that the vibrator such as the yoke 200 is protected while maintaining durability. The generated vibration can be physically and flexibly supported.

Hereinafter, as an example, dimensions of a main part of a suspension 700 built into a cylindrical bone conduction speaker 1000 having an outer diameter of 13 mm ± 0.1 and a width of 5 mm will be described. The width of the bone conduction speaker 1000 can be selected within ±20%.

Of course, if the outer diameter of the bone conduction spker 1000 is changed, the relative dimensions of the suspension 700 may also be changed.

First, it is preferable that the wave area 743a is in the range of 40 degrees to 80 degrees with respect to the center of the circular shape.

When the angle α of the waveform region 743a is less than 40 degrees with respect to the center of the circle, the resonance frequency rapidly increases and the quality of the received sound deteriorates. When it is greater than 80 degrees, the response displacement and maximum stress become excessive. Durability is greatly reduced.

As shown in FIG. 8, when a predetermined electromagnetic force is applied in the primary resonance mode, the maximum stress of the bridge part 740 appears at both ends of the connecting bridge 743, as expected.

At this time, as a restraining condition, the upper ends of the circuit board portion 130 and the receiving portion 120 of the housing 100 were fixed, and electromagnetic force in the axial direction was applied.

In addition, the inner circumferential diameter of the inner ring portion 720 is 8.85 ± 0.03 mm, the outer circumferential diameter of the outer ring portion 730 is 12.25 ± 0.03 mm, and the minimum width (w) of the connecting bridge 743 is 0.3 It is preferable to exist in the range of mm - 0.6 mm.

If the minimum width of the connection bridge 743 is less than 0.3 mm, the response displacement becomes excessive, resulting in a significant drop in durability.

In addition, the inner circumferential diameter of the inner ring portion 720 is 8.85 ± 0.03 mm, the outer circumferential diameter of the outer ring portion 730 is 12.25 ± 0.03 mm, and the thickness (t) of the bridge portion 740 is 0.06 mm to 0.06 mm. It is preferable to be in the range of 0.3 mm.

If the thickness of the bridge part 740 is less than 0.06 mm, the response displacement and maximum stress become excessive, resulting in a significant decrease in durability.

In this way, through optimal selection of various dimensions (angle, minimum width, and thickness of the waveform region of the connecting bridge) of the bridge portion 740, appropriate restrictions on the resonance frequency, response displacement, and maximum stress can be achieved.

Based on these details, it is possible to obtain the optimal dimensions of the suspension that satisfy the above-mentioned limiting conditions.

In this case, what needs to be considered is the relationship between the angle of the corrugated region 743a, the minimum width of the connecting bridge 743, and the thickness of the bridge portion 740 and the response displacement and maximum stress.

As shown in FIGS. 6A to 6C, experimentally, it was found that the angle of the waveform region is inversely proportional to the resonant frequency and proportional to the response displacement and maximum stress, and the width of the connecting bridge 743 is proportional to the resonant frequency and the displacement It was found to be inversely proportional to and unrelated to the maximum stress, and the thickness of the bridge portion 740 was found to be proportional to the resonant frequency, and the response displacement and maximum stress exhibited nonlinear characteristics.

Based on this relationship, a prediction model for the resonance frequency (F ₀ ), the response displacement (δ), and the maximum stress (σ _max ) can be established through the regression equation as shown below.

First, the regression equation of the resonant frequency (F ₀ ) is as shown in [Equation 1] below.

[식 1]

[Equation 1]

Next, the regression equation of the response displacement (δ) is as [Equation 2] below.

[Equation 2]

And, the regression equation of the maximum stress (σ _max ) is as shown in [Equation 3] below.

[식 3]

[Equation 3]

Optimum values of the angle of the waveform region 743a, the minimum width of the connecting bridge 743, and the thickness of the bridge portion 740 satisfying predetermined constraints can be obtained using these relational expressions.

Numerically, with respect to the four sets of bridge parts 740, the main requirements of the suspension 700 are a resonance frequency (F ₀ ) of 100 Hz or less, a response displacement (δ) of 0.62 mm or less, and a maximum stress (σ _max ) of 2,300 Mpa. When the following limiting conditions were applied, the angle of the corrugated area 743a was 70 degrees, the minimum width of the connecting bridge 743 was 0.3 mm, and the thickness of the bridge portion 740 was 0.09 mm.

In this way, the angle of the waveform region 743a, the minimum width of the connecting bridge 743, and the thickness of the bridge part 740 derived through computer simulation based on the four sets of bridge parts 740 are experimentally verified. It was found that all of the above constraints were satisfied.

Experimentally, even if the angle of the wave region 743a is set to 70 degrees ± 2 degrees, the minimum width of the connecting bridge 743 is 0.3 mm + 0.03 mm, and the thickness of the bridge portion 740 is 0.09 mm ± 0.01 mm, indicate that it is within range.

Meanwhile, both of the response displacement (δ) and the maximum stress (σ _max ) may not be satisfied. In this case, the response displacement (δ) and the maximum stress (σ _max ) may be adjusted by adjusting the electromagnetic force.

This is possible by adjusting the magnetic flux and magnetic field formed by the magnet 300 and the coil 500 .

For reference, as the electromagnetic force decreases, values of response displacement δ and maximum stress σ _max decrease and fatigue life tends to increase.

As can be seen from SPL (Sound Pressure Level) of FIG. 7 , when the suspension 700 according to the present invention is applied, the bone conduction speaker 1000 has excellent sound quality not only in the high-pitched range but also in the low-pitched range.

In addition, as shown in FIG. 9, through natural frequency response analysis, it can be seen that the mode reciprocating in the axial direction is obtained as the first mode, and motions such as tilting appear in the other modes.

In this case, the frequency input range is 10 Hz to 10 kHz, the damping ratio is 0.0216, the electromagnetic force of 0.019485 N is applied as a load condition, and the circuit board part 130 of the housing 100 and the receiving part ( 120) was measured for displacement at the center point of the yoke 200 while the upper end was fixed.

A circuit board part 130 is installed at the end of the housing 100 where the coil 500 is installed to perform various control functions. Typically, the circuit board part 130 is a digital signal processing (DSP) circuit. can include

Although the invention made by the present inventors has been specifically described according to the above embodiments, the present invention is not limited to the above embodiments and can be changed in various ways without departing from the scope of the claims described below.

100... Housing
110... Accommodation space
120 ... receptacle
130... circuit board part
200... yoke part
300... magnet
400... magnet support
500... coil
600... yoke cover
700... Suspension
710... hollow
720... inner ring
730... outer race
740 ... bridge part
741... first connecting body
742... second connecting body
743... connecting bridge
743a... Waveform Region
750... Gap
1000... bone conduction speaker

Claims (9)

a housing in which an accommodation space is formed;
A yoke installed in the accommodation space of the housing and having a container shape;
A magnet installed on top of the yoke;
a magnet support part installed on top of the magnet;
a coil surrounding the magnet support;
a yoke cover disposed to surround the circumference of the yoke; and
a suspension connecting the yoke and the housing within the housing;
Including,
The suspension is made of an integral circular annular shape having a flat surface, a hollow formed, and a constant width, an inner ring portion adjacent to the hollow and extending in the circumferential direction of the hollow, an outer ring portion forming an outer circumference, and A bone conduction speaker characterized in that it includes a bridge portion connecting the outer ring portion, and four sets of the bridge portions are spaced apart at equal intervals along the circumferential direction, and each set includes connection bridges extending along the circumferential direction. . According to claim 1,
The bridge part,
A first connection body extending radially from the outer ring portion toward the inner ring portion;
a second connection body extending radially from the inner ring portion toward the outer ring portion; and
a connection bridge connecting the first connection body and the second connection body and extending with a gap formed between the outer ring portion and the inner ring portion, respectively;
A bone conduction speaker characterized in that it is configured to include. According to claim 2,
Bone conduction speaker according to claim 1, wherein, along the circumferential direction, the connecting bridge includes a waveform region having a shape in which a width in a radial direction gradually decreases from both ends toward the center. According to claim 3,
The bone conduction speaker, characterized in that the angle of the wave area is in the range of 40 degrees to 80 degrees with respect to the center of the circle. According to any one of claims 2 to 4,
The inner circumferential diameter of the inner ring portion has dimensions of 8.85 ± 0.03 mm, the outer circumferential diameter of the outer ring portion has dimensions of 12.25 ± 0.03 mm, and the minimum width of the connecting bridge is in the range of 0.3 mm to 0.6 mm. Bone conduction speaker, characterized in that. According to any one of claims 2 to 4,
The inner circumferential diameter of the inner ring portion has dimensions of 8.85 ± 0.03 mm, the outer circumferential diameter of the outer ring portion has dimensions of 12.25 ± 0.03 mm, and the thickness of the bridge portion is in the range of 0.06 mm to 0.3 mm. Bone conduction speaker, characterized in that. According to claim 3,
The bone conduction speaker according to claim 1, wherein the waveform area is 70 degrees with respect to the center of the circular shape, the minimum width of the connection bridge is 0.3 mm, and the thickness of the bridge portion is 0.09 mm. According to any one of claims 1 to 4,
The bone conduction speaker, characterized in that the housing is composed of a container-shaped accommodating portion and a circuit board portion to which a DSP circuit is applied and covering an opening of the accommodating portion, and a coil is installed on one side of the circuit board portion facing the accommodating portion. According to any one of claims 1 to 4,
A bone conduction speaker comprising a function of adjusting electromagnetic force.

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