Acoustic vibrator

Abstract

The present invention provides an acoustic vibrator that is provided inside a housing, in which a yoke is vibrated in response to an externally applied electrical signal to generate an acoustic signal, the acoustic vibrator comprising: a length-variable member having a length in a horizontal direction and the length of which is selectively extendable and contractible by means of a signal applied from the outside; a first deformable member having one end and the other end respectively connected to one end and the other end of the length-variable member, and which is deformed in response to length expansion and contraction of the length-variable member; and a second deformable member having one end and the other end respectively connected to one end and the other end of the length-variable member, and which is deformed in response to length expansion and contraction of the length-variable member, wherein the acoustic vibrator achieves relatively large displacement by amplifying compression and extension of a piezoelectric body by using deformation of an elastic body, enables output of a large driving force (acoustic signal) by means of inertia generated by using a mass body coupled to the elastic body, and adjusts a resonant frequency via an appropriate combination of mass and elasticity so as to produce an output frequency characteristic optimized for a purpose.

Description

acoustic vibrator

[0001] The present invention relates to a vibrating body for outputting sound, and more particularly, to an acoustic vibrating body in which displacement of a displacement part for outputting a sound signal is rapidly achieved by utilizing deformation of a length-variable member whose length is expanded or contracted by an externally applied electrical signal (voltage) and a deformation member made of an elastic body.

[0002] In general, the human auditory transmission process is composed of the airway and bone conduction, and due to the shortcomings of airway transmission such as concealment or airway obstruction, various bone conduction vibrators with different mechanisms are being developed and utilized.

[0003] In the case of vibrators for the purpose of outputting sound signals, they can be divided into electromagnetic methods for improving energy efficiency and piezoelectric methods for miniaturization. However, the piezoelectric method has the disadvantage of requiring a high applied voltage to produce a large output.

[0004] For prior art, please refer to Patent No. 10-1389691 (April 22, 2014).

[0005] The purpose of the present invention is to provide an acoustic vibrator that can amplify the compression / extension of a piezoelectric body by utilizing the deformation of an elastic body to have a relatively large displacement, output a large driving force (acoustic signal) through inertia generated by utilizing a mass combined with an elastic body, and create output frequency characteristics optimized for the purpose by controlling the resonance frequency with an appropriate combination of mass and elasticity.

[0006] An acoustic vibrator according to the present invention is provided inside a housing, and generates an acoustic signal by vibrating a yoke in response to an externally applied electric signal, the acoustic vibrator comprising: a length-variable member having a length in a horizontal direction and selectively expanding and contracting in response to an externally applied signal; a first deformation member, one end and the other end of which are respectively connected to one end and the other end of the length-variable member, and deformed in response to the expansion and contraction of the length of the length-variable member; and a second deformation member, one end and the other end of which are respectively connected to one end and the other end of the length-variable member, and deformed in response to the expansion and contraction of the length of the length-variable member; wherein either the first deformation member or the second deformation member is connected to the yoke, and a diaphragm connected to the yoke vibrates due to the deformation of the deformation member connected to the yoke, thereby generating an acoustic signal.

[0007] At this time, it is preferable that the length-variable member according to the present invention is a piezoelectric material whose length is selectively stretched by an externally applied voltage.

[0008] And the length-variable member according to the present invention may include a central body arranged at the center of the length, a first piezoelectric member arranged on one side of the central body, and a second piezoelectric member arranged on the other side of the central body.

[0009] Here, it is preferable that the length of the first piezoelectric member and the length of the second piezoelectric member according to the present invention are arranged to form a straight line, so that the longitudinal expansion directions of the first piezoelectric member and the second piezoelectric member form a straight line.

[0010] In addition, it is preferable that the first deformation member and the second deformation member according to the present invention are elastic bodies having self-elasticity.

[0011] At this time, it is preferable that the first displacement member and the second displacement member according to the present invention are arranged symmetrically with each other with the length of the length-variable member as the axis.

[0012] And, it is preferable that one end and the other end of each of the first and second deformation members according to the present invention are connected to a connecting portion coupled to one end and the other end of the length-variable member, respectively.

[0013] In addition, each of the first deformation member and the second deformation member according to the present invention forms a displacement portion protruding in an upward and downward vertical line from the center of its length.

[0014] Here, among the first displacement portion of the first deformation member and the second displacement portion of the second deformation member according to the present invention, it is preferable that a yoke is connected to the second displacement portion that protrudes downward, and a mass is connected to the second displacement portion that protrudes upward.

[0015] The effects exhibited by the acoustic vibrator according to the present invention are as follows.

[0016] By utilizing the deformation of a length-variable member that is elastic and expandable by an externally applied electrical signal (voltage) and a deformation of a deformation member made of an elastic body, the displacement of the displacement part can be amplified (∝ velocity, acceleration), and a mass coupled to one of a pair of symmetrical displacement parts can be used to generate a large force displacement in the other displacement part, making it easy to generate a high-frequency output.

[0017] In addition, by controlling the degree of elongation of the length-variable member, the degree of displacement of the displacement part of the deformable member can be controlled, making it easy to control the frequency characteristics and widening the frequency bandwidth that can be output.

[0018] It can be used in various sound output devices such as bone conduction sound transmission devices by utilizing a vibrating body with excellent driving force (output).

[0019] FIG. 1 is an exemplary diagram showing a bone conduction sound transmission device having an acoustic vibrator according to an embodiment of the present invention.

[0020] Figure 2 is an exemplary diagram showing an acoustic vibrator according to the first embodiment of the present invention.

[0021] Figure 3 is an exemplary diagram showing the deformation state of a deformable member due to length expansion of a length-variable member according to the first embodiment of the present invention.

[0022] Fig. 4 is an exemplary diagram showing a state in which a mass body is provided in a vibrating body according to the first embodiment of the present invention.

[0023] Fig. 5 is an exemplary diagram showing an acoustic vibrator according to a second embodiment of the present invention.

[0024] Fig. 6 is an exemplary diagram showing the deformation state of a deformable member due to length expansion of a length-variable member according to a second embodiment of the present invention.

[0025] Fig. 7 is an exemplary diagram showing a state in which a mass body is provided in a vibrating body according to a second embodiment of the present invention.

[0026] An acoustic vibrator according to the present invention comprises a length-variable member having a length in a horizontal direction and selectively expanding and contracting in length by an externally applied signal, a first deformation member having one end and the other end connected to one end and the other end of the length-variable member, respectively, and deforming in response to the expansion and contraction of the length of the length-variable member, and a second deformation member having one end and the other end connected to one end and the other end of the length-variable member, respectively, and deforming in response to the expansion and contraction of the length of the length-variable member, wherein either the first deformation member or the second deformation member is connected to the yoke, and a diaphragm connected to the yoke vibrates due to the deformation of the deformation member connected to the yoke, thereby generating an acoustic signal.

[0027]

[0028] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concept of a term to best explain his or her invention, the terms and words should be construed in a way that conforms to the technical spirit of the present invention.

[0029] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that there may be equivalent modified examples that can replace them at the time of filing this application.

[0030] The present invention relates to an acoustic vibrator capable of amplifying (∝velocity, acceleration) the displacement of a displacement portion by utilizing the deformation of a length-variable member that is elastic and expandable by an externally applied electrical signal (voltage), and capable of generating a large force displacement in one displacement portion among a pair of symmetrical displacement portions by a mass body coupled to the other displacement portion, thereby varying the resonant frequency by a combination of the mass and elasticity of the mass body, and is as follows with reference to the drawings.

[0031] An acoustic vibrator (10) according to an embodiment of the present invention with reference to FIGS. 1 to 7 is provided inside a housing (20) and vibrates a yoke (30) in response to an electric signal applied from the outside, thereby causing a vibrating plate connected to the yoke (30) to vibrate and generate an acoustic signal. The acoustic vibrator includes a length-variable member (100), a first deformation member (200), a second deformation member (300), and a mass body (500).

[0032] First, looking at the length-variable member (100) of the vibrating body (10) according to the first embodiment of the present invention with reference to FIGS. 2 to 4, the length-variable member (100) has a length in the horizontal direction and is selectively stretched in length by an electrical signal (voltage) applied from the outside.

[0033] More specifically, the length-variable member (100) is reduced in length by an electrical signal (voltage) applied from the outside, and when the electrical signal (voltage) is no longer applied, it extends back to its original length.

[0034] At this time, it is preferable that the length-variable member (100) be composed of a piezoelectric material whose length is selectively stretched by an externally applied voltage.

[0035] Therefore, it is preferable that the length-variable member (100) be selectively lengthened or reduced (stretched) in the horizontal direction by a voltage applied from the outside.

[0036] And, a first deformation member (200) and a second deformation member (300) are connected to the length-variable member (100). The first deformation member (200) is connected to one end and the other end of the first deformation member (200), respectively, and the degree of curvature changes and is deformed in response to the length expansion and contraction of the length-variable member (100).

[0037] At this time, the first deformation member (200) forms an arc shape curved upward or downward, and one end and the other end of the length-variable member (100) are connected to the connecting portions (410, 420) formed to protrude inward from the one end and the other end of the first deformation member (200) toward the one end and the other end of the length-variable member (100).

[0038] Here, the ends of the above connecting parts (410, 420) are respectively joined by making contact with one end and the other end of the length-variable member (100).

[0039] In addition, the second deformation member (300) is also connected to one end and the other end of the length-variable member (100) at one end and the other end of the second deformation member (300), respectively, and the degree of curvature thereof changes and is deformed in response to the length expansion and contraction of the length-variable member (100).

[0040] Here, the second deformation member (300) also forms an arc shape that is curved upward or downward, and one end and the other end of the second deformation member (300) are also connected to the connecting portions (410, 420) that are connected to one end and the other end of the length-variable member (100), respectively.

[0041] Therefore, it is preferable that the first deformation member (200), the pair of connecting parts (410, 420), and the second deformation member (300) are connected to each other to form an integral body, and the first deformation member (200) and the second deformation member (300) are made of an elastic material (rubber, silicone, etc.) having elasticity of their own, so that their shape is quickly deformed in response to the length-extension action of the length-variable member (100), and the displacement width also generates a relatively large displacement compared to a hard material.

[0042] Looking at the first deformation member (200) and the second deformation member (300) in more detail, the first deformation member (200) and the second deformation member (300) are formed in a thin, belt-shaped shape with a width equal to the width of the length-variable member (100) so as to have a flexible property so that rapid displacement (displacement speed and displacement acceleration) can occur in selective deformation, and a displacement portion (210, 310) is formed to protrude vertically in the center of the length of each of the first deformation member (200) and the second deformation member (300).

[0043] At this time, it is preferable that the first deformation member (200) and the second deformation member (300) forming a belt shape form an arc that is curved upward and downward, respectively, and the first deformation member (200) is provided on the upper side of the length-variable member (100) with the length direction of the length-variable member (100) as the axis, and the second deformation member (300) is provided on the lower side of the length-variable member (100), so that the first deformation member (200) and the second deformation member (300) are symmetrical with respect to the length-variable member (100).

[0044] Here, the first deformation member (200) and the second deformation member (300) can form wrinkles along the length, form dimples in a pattern, or form unevenness in a pattern. However, since wrinkles, dimples, unevenness, etc. can be formed depending on the resonant frequency to be output, there is no limitation to any one of them.

[0045] Accordingly, the first deformation member (200) is provided on the upper side of the length-variable member (100) with the length direction of the length-variable member (100) as the axis, and the shape of the first deformation member (200) is deformed in response to the length contraction (or elongation) of the length-variable member (100), so that the first displacement portion (210) protruding upward from the center of the length of the first deformation member (200) is displaced in the vertical direction.

[0046] In addition, the second deformation member (300) is provided on the lower side of the length-variable member (100) with the length direction of the length-variable member (100) as the axis, so that the shape of the second deformation member (300) is deformed in response to the length contraction (or elongation) of the length-variable member (100), so that the second displacement portion (320) protruding downward from the center of the length of the second deformation member (300) is displaced in the vertical direction.

[0047] Here, the first deformation member (200) and the second deformation member (300) are provided symmetrically with respect to the upper and lower sides of the length-variable member (100) with the length direction of the length-variable member (100) as the axis, so that in response to the length expansion and contraction of the length-variable member (100), the first deformation member (200) and the second deformation member (300) are simultaneously deformed, and the displacement degrees of the first and second displacement portions (210, 310) are also identically displaced.

[0048] At this time, the first deformation member (200) and the second displacement part (320) of the second deformation member (300) among the second deformation members (300) are connected to the yoke (30), so that the second displacement part (320) is displaced by the deformation of the second deformation member (300), and the yoke (30) connected to the second displacement part (320) vibrates due to the displacement of the second displacement part (320) to generate an acoustic signal.

[0049] In addition, the first displacement portion (220) of the first deformation member (200) is connected to a mass body (500) having weight. Instead of limiting the deformation of the first deformation member (200), the mass body (500) connected to the first displacement portion (220) of the first deformation member (200) applies weight in the vertical direction so that when the second deformation member (300) is displaced, a greater force can be exerted, thereby exerting a large force (large output) at a high frequency output.

[0050] And the length-variable member (100) of the acoustic vibrating body (10) according to the second embodiment of the present invention with reference to FIGS. 5 to 7 can be composed of a pair of piezoelectric elements.

[0051] Referring to FIGS. 5 to 7, the length-variable member (100) may include a central body (110), a first piezoelectric member (120) arranged on one side of the central body (110), and a second piezoelectric member (130) arranged on the other side of the central body (110).

[0052] At this time, it is preferable that the first piezoelectric element (120) and the second piezoelectric element (130) are arranged so that the length of the first piezoelectric element (120) and the length of the second piezoelectric element (130) are in a straight line.

[0053] Accordingly, the first piezoelectric body (120) and the second piezoelectric body (130) are stretched along the same longitudinal stretching direction.

[0054] The first piezoelectric member (120) and the second piezoelectric member (130) of the above-mentioned variable length member (100) can be stretched simultaneously, or stretched at different times from each other, or only one of the first piezoelectric member (120) and the second piezoelectric member (130) can be controlled to stretch.

[0055] And, a first deformation member (200) and a second deformation member (300) are connected to the length-variable member (100). The first deformation member (200) is connected to one end and the other end of the first deformation member (200), respectively, and the degree of curvature changes and is deformed in response to the length expansion and contraction of the length-variable member (100).

[0056] At this time, the first deformation member (200) forms an arc shape curved upward or downward, and one end and the other end of the length-variable member (100) are connected to the connecting portions (410, 420) formed to protrude inward from the one end and the other end of the first deformation member (200) toward the one end and the other end of the length-variable member (100).

[0057] Here, the ends of the above connecting parts (410, 420) are respectively joined by making contact with one end and the other end of the length-variable member (100).

[0058] In addition, the second deformation member (300) is also connected to one end and the other end of the length-variable member (100) at one end and the other end of the second deformation member (300), respectively, and the degree of curvature thereof changes and is deformed in response to the length expansion and contraction of the length-variable member (100).

[0059] Here, the second deformation member (300) also forms an arc shape that is curved upward or downward, and one end and the other end of the second deformation member (300) are also connected to the connecting portions (410, 420) that are connected to one end and the other end of the length-variable member (100), respectively.

[0060] Therefore, it is preferable that the first deformation member (200), the pair of connecting parts (410, 420), and the second deformation member (300) are connected to each other to form an integral body, and the first deformation member (200) and the second deformation member (300) are made of an elastic material (rubber, silicone, etc.) having elasticity of their own, so that their shape is quickly deformed in response to the length-extension action of the length-variable member (100), and the displacement width also generates a relatively large displacement compared to a hard material.

[0061] Looking at the first deformation member (200) and the second deformation member (300) in more detail, the first deformation member (200) and the second deformation member (300) are formed in a thin, belt-shaped shape with a width equal to the width of the length-variable member (100) so as to have a flexible property so that rapid displacement (displacement speed and displacement acceleration) can occur in selective deformation, and a displacement portion (210, 310) is formed to protrude vertically in the center of the length of each of the first deformation member (200) and the second deformation member (300).

[0062] At this time, it is preferable that the first deformation member (200) and the second deformation member (300) forming a belt shape form an arc that is curved upward and downward, respectively, and the first deformation member (200) is provided on the upper side of the length-variable member (100) with the length direction of the length-variable member (100) as the axis, and the second deformation member (300) is provided on the lower side of the length-variable member (100), so that the first deformation member (200) and the second deformation member (300) are symmetrical with respect to the length-variable member (100).

[0063] Here, the first deformation member (200) and the second deformation member (300) can form wrinkles along the length, form dimples in a pattern, or form unevenness in a pattern. However, since wrinkles, dimples, unevenness, etc. can be formed depending on the resonant frequency to be output, there is no limitation to any one of them.

[0064] Accordingly, the first deformation member (200) is provided on the upper side of the length-variable member (100) with the length direction of the length-variable member (100) as the axis, and the shape of the first deformation member (200) is deformed in response to the length contraction (or elongation) of the length-variable member (100), so that the first displacement portion (210) protruding upward from the center of the length of the first deformation member (200) is displaced in the vertical direction.

[0065] In addition, the second deformation member (300) is provided on the lower side of the length-variable member (100) with the length direction of the length-variable member (100) as the axis, so that the shape of the second deformation member (300) is deformed in response to the length contraction (or elongation) of the length-variable member (100), so that the second displacement portion (320) protruding downward from the center of the length of the second deformation member (300) is displaced in the vertical direction.

[0066] Here, the first deformation member (200) and the second deformation member (300) are provided symmetrically with respect to the upper and lower sides of the length-variable member (100) with the length direction of the length-variable member (100) as the axis, so that in response to the length expansion and contraction of the length-variable member (100), the first deformation member (200) and the second deformation member (300) are simultaneously deformed, and the displacement degrees of the first and second displacement portions (210, 310) are also identically displaced.

[0067] At this time, the first deformation member (200) and the second displacement part (320) of the second deformation member (300) among the second deformation members (300) are connected to the yoke (30), so that the second displacement part (320) is displaced by the deformation of the second deformation member (300), and the yoke (30) connected to the second displacement part (320) vibrates due to the displacement of the second displacement part (320) to generate an acoustic signal.

[0068] In addition, the first displacement portion (220) of the first deformation member (200) is connected to a mass body (500) having weight. Instead of limiting the deformation of the first deformation member (200), the mass body (500) connected to the first displacement portion (220) of the first deformation member (200) applies weight in the vertical direction so that when the second deformation member (300) is displaced, a greater force can be exerted, thereby exerting a large force (large output) at a high frequency output.

[0069] While the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely exemplary, and those skilled in the art will appreciate that various modifications and equivalent alternative embodiments are possible. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

Claims

1. A vibrating body that is installed inside a housing and generates an acoustic signal by vibrating a yoke in response to an electric signal applied from the outside, A length-variable member having a length in the horizontal direction and whose length can be selectively expanded by an externally applied signal; A first deformation member, one end and the other end of which are connected to each other of the length-variable member, and which is deformed in response to the length expansion of the length-variable member; and A second deformation member is connected to one end and the other end of the length-variable member, respectively, and is deformed in response to the length expansion of the length-variable member; An acoustic vibrating body in which one of the first or second deformation members is connected to the yoke, and a vibration plate connected to the yoke vibrates due to deformation of the deformation member connected to the yoke, thereby generating an acoustic signal.

2. In claim 1, The above variable length member An acoustic vibrating body characterized by being a piezoelectric material whose length is selectively stretched by an externally applied voltage.

3. In claim 2, The above variable length member A central body placed in the center of that length, A first piezoelectric element arranged on one side of the above central body, An acoustic vibrating body including a second piezoelectric element arranged on the other side of the central body.

4. Following claim 3, An acoustic vibration body in which the lengths of the first piezoelectric body and the second piezoelectric body are arranged to form a straight line, and the longitudinal expansion directions of the first piezoelectric body and the second piezoelectric body form a straight line.

5. In claim 4, The above first deformation member and second deformation member An acoustic vibrating body characterized by being an elastic body having self-elasticity.

6. In claim 3, The above first displacement member and second displacement member An acoustic vibrating body arranged symmetrically with respect to the length of the above-mentioned variable length member as an axis.

7. In claim 6, One end and the other end of each of the first and second deformation members are An acoustic vibration body connected to a connecting portion respectively connected to one end and the other end of the above-mentioned variable length member.

8. In claim 6, The above first deformation member forms a first displacement portion protruding upward from the center of its length, The above second deformation member is an acoustic vibrating body that forms a second deformation portion protruding downward from the center of its length.

9. In claim 7, An acoustic vibration body characterized in that, among the first displacement portion of the first deformation member and the second displacement portion of the second deformation member, a yoke is connected to the second displacement portion that protrudes downward, and a mass is connected to the second displacement portion that protrudes upward.

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