KR20050030183A - Micro speaker generating acoustic vibration and sound - Google Patents

Abstract

A micro speaker for generating the acoustic vibration and sound is provided to remove the interference of vibration by improving the vibrational transmission path to the case of the micro speaker. A micro speaker for generating the acoustic vibration and sound includes a housing, a diaphragm(80), a voice coil(81), a vibrational disk(50), a vibrational coil(51), one or two magnets and an inner frame(40). The housing is provided with a top case(30), a bottom case(31) and an external frame(32). The voice coil(81) is attached to the diaphragm(80) and the vibrational coil(51) is connected to the vibrational disk(50). The magnets is corresponding to the voice coil(81) and the vibrational coil(51). The diaphragm(80) is fixed to the external frame(32). The vibrational disk(50) is fixed to the inner frame(40).

Description

Micro speaker generating acoustic vibration and sound

The present invention relates to a sound and vibration generating microspeaker capable of conducting a complex sound through the air vibration and mechanical vibration in a configuration of a composite mode or only mechanical vibration in a single mode configuration,

More specifically, in delivering the generated sound of the speaker, a method of transmitting through the airway using air vibration, and using the mechanical vibration to perform the transmission through the bones of the human body at the same time, or to enable delivery to bone conduction The present invention relates to a microspeaker for generating sound and vibration.

There are a number of sources that apply the basic principles of microspeakers for various purposes by generating sound and vibration simultaneously.

For example, in Korean Patent Publication No. 2002-0086580, Korean Patent Publication No. 2002-0070475, Korean Patent Registration 10-0390003, Utility Model Registration No. 20-0295460, Patent Registration No. 10-0390003, etc. Speakers of various configurations to conduct electricity are presented.

8 is representative of such a source configuration,

Fig. 1 is a cross-sectional view showing the structure of a conventional microspeaker of a sound vibration combined mode using one voice coil. The voice coil 102 is bonded to the air vibration generating diaphragm 103, and the yoke 106 and the magnet 107 are bonded to the lower mechanical vibration generating diaphragm 105, and the diaphragm 103 and the diaphragm ( 105 is fixed to one frame 101.

When the AC signal is applied to the voice coil 102, the diaphragm 103 and the diaphragm 105 vibrate by mutual electromagnetic force generated between the voice coil 102 and the magnet 107, causing air vibration and mechanical A configuration for generating vibrations is disclosed.

However, in the case of this source configuration, the two forces acting between the voice coil 102 and the magnet 107 are equal in magnitude but opposite in direction as the acting force and the reaction force, resulting in suction or repulsive force, and the diaphragm 103 The upper vibrometer having a relatively low mass has a large amplitude, and the lower vibrometer including the diaphragm 105 has a relatively large mass, so that the amplitude is small. It is very low, it is difficult to give enough vibration to transmit sound by bone conduction, and it is impossible to adjust the proper output level between air vibration and machine vibration because of the same force exchanged by one voice coil. .

As another source configuration, FIG. 9 is a cross-sectional view showing a conventional microspeaker structure of a conventional acoustic vibration combined mode using two voice coils to improve the problems of the above-described configuration.

Since each voice coil can be adjusted using the upper vibration part for generating air vibration and the lower vibration part for generating mechanical vibration, the level of the mechanical vibration is appropriate while maintaining the level of air vibration. It is possible to match.

However, two forces of the same size and opposite directions are generated between the upper voice coil 110 and the magnet 111, that is, the action force and the reaction force are generated, and the action force and reaction between the lower vibration coil 112 and the magnet 111. Force is generated. In this case, since the upper vibration part, the lower vibration part, and the magnet 111 are all fixed to one frame 114, each vibration is partially canceled by overlapping in the frame 114. When the sound or vibration is transmitted through the frame 114, there is a problem that there is a loss in the occurrence of mechanical vibration and cause distortion of the acoustic signal.

10 relates to a bone conduction microspeaker having a mastoid 120 in Korean Utility Model Publication No. 20-0295460,

In the configuration of this source, the force received by the magnet 121 is transmitted to the frame 122, and the vibration generated by the voice coil 123 by magnetic force is transmitted to the human skin through the mastoid 120.

There is no direct contact between the frame 122 and the mastoid 120, there is no overlap or distortion between the vibration of the magnet 121 and the voice coil 123.

However, since the vibrator is in direct contact with the skin, pressure is applied to the vibrator from the outside, and the pressure is not constant according to the user, and the output or characteristic depends on the external pressure applied to the mastoid 120. Significantly different and there is a problem with reliability.

The acoustic and vibration generating microspeakers of the present invention are to provide an improved configuration of such a conventional microspeaker of acoustic conduction, complex mode of oscillation bone conduction or single mode of oscillation bone conduction,

It consists of a voice coil, a vibration coil, an inner frame as a magnet and an intermediate member, a housing which enables effective bone conduction vibration transmission, and the like.

By minimizing the offset and the loss and distortion of mechanical vibration caused by the overlap in the housing, it is possible to use not only the vibration mode with improved sound quality and frequency characteristics, but also the combined mode that can simultaneously transmit airway sound and bone conduction vibration. It aims at making it possible.

The present invention implements the improved mechanical configuration of the acoustic diaphragm, vibrating disk, magnet, internal frame, etc., and provides a configuration to effectively transfer bone conduction vibration to a separate housing.

Accordingly, the microspeaker of the present invention satisfies the airway acoustic characteristics of the microspeaker using only the conventional acoustic mode, and simultaneously generates sufficient vibration to transmit sound through the bone conduction vibration.

In addition, the present invention is to provide a micro-speaker capable of reducing energy efficiency, miniaturization, and thinning while solving various problems such as frequency band limitation and deterioration of mechanical stability of the conventional bone conduction microspeaker.

The sound and vibration generating microspeakers of the present invention together with the accompanying drawings will be described in more detail.

1, 2 and 3 are basic examples of the first embodiment for the composite mode of the acoustic and vibration generating microspeakers of the present invention, Figure 4 is a first modification of the first embodiment, Figure 5 is a second embodiment of the first embodiment Variation,

6 is a basic example of the second embodiment of the bone conduction mode of the acoustic and vibration generating microspeakers of the present invention, Figure 7 is a first modification of the second embodiment,

FIG. 11 is an explanatory diagram sequentially showing an embodiment in which the microspeaker of the acoustic vibration combined mode of the present invention is applied to a cellular phone.

The present invention is applicable to the composite mode of the acoustic-bone conduction method and the bone conduction mode, respectively, and will be described below as a separate embodiment.

[Basic Example of First Embodiment]

[Microspeakers for Combined Sound and Vibration Generation Modes]

As disclosed in detail in the cross-sectional view of FIG. 1 and the exploded perspective view of FIG. 2, in which a microspeaker (MS) implementing a composite mode of acoustic conduction and vibrating bone conduction is shown,

In the micro speaker MS, the upper case 30, the lower case 31 and the outer frame 32 constitute a housing H.

In the housing (H) is formed a receiving space (G), as a constitutional feature of the present invention, the inner frame 40 of the form that is capable of free flow up and down within the housing (H) is accommodated as a medium, Vibration applied to the lower case 31 is transmitted to the upper case 30 via the outer frame 32 to have a configuration that generates the vibration in the same direction as the sound.

The upper casing 30 and the lower casing 31 drill a plurality of vent holes 30 'and 31' to facilitate the flow of air and to facilitate the emission of the generated sound.

As shown in Fig. 3 below the inner frame 40,

The vibration disk 50 generating vibration for bone conduction is fixed, and the vibration disk 50 is attached to the central protrusion 31 ′ of the lower case 31 of the housing H so that the internal frame 40 vibrates. The disk 50 is mounted in a floating shape.

The mounting plate 90 is fixed inside the upper end of the inner frame 40,

A ring-shaped magnet 70 is attached below the mounting plate 90, and a yoke plate 60 having a pole piece 61 is fixed below the magnet 70 to operate the voice coil and the vibration coil. The first air gap g1 and the second air gap g2 may be formed.

The diaphragm 80 for sound generation is fixed to the upper side of the outer frame 32, and the voice coil 81 attached to the diaphragm 80 operates in the first air gap g1.

The vibration coil 51 attached to the vibration disk 50 operates in the second air gap g2 configured between the magnet 70 and the mounting plate 90.

In the above-described configuration, the diaphragm 80-the voice coil 81-the magnet 70 in the sound and vibration generating microspeaker of the present invention forms a magnetic field for sound generation, and the vibration disk 50-vibration coil 51 The) -magnet 70 forms a magnetic field of vibration generation and is divided into an acoustic generation region and a vibration generation region.

The vibration disk 50 is processed into a metal plate having a good elasticity so as to easily transfer the vibration of the acoustic conversion caused by the magnet 70 and the vibration coil 51 to the lower case 31, more preferably Figure 3 As in the top view of a,

A plurality of bridge slits (S1, S2, ..), which are arc-shaped perforated slits (S1, S2,. By connecting C1, C2, C3 ..), spring ribs (P1, P2, P3 ..) are formed therebetween so as to have a shape of a diaphragm configured to induce mechanical vibration more smoothly.

In this configuration, the vibrating disk 50 has a constant elastic modulus such as a leaf spring as a whole.

Vibration discs 50 ', 50 "of another embodiment are disclosed in Figures 3b, 3c and the number, thickness, number of bridge slits S1, S2, ..., spring ribs P1, P2, ... It is, of course, based on the comprehensive data through the acoustic-vibration characteristics, the characteristics of the material constituting the vibrating disk, the speaker capacity, and the electrical characteristics.

[First Modification of First Embodiment]

The first modification of the first embodiment constructed while sharing the technical idea with the acoustic and vibration generating microspeakers of the present invention is shown in Fig. 4, and the same members as the above-described embodiments will be described using the same member numbers.

As shown in the configuration of the mounting plate 190 is fixed to the upper end of the inner frame 40,

By removing the yoke plate 60 of the above-described basic embodiment and having a first magnet 170 in the center of the mounting plate 190 in which the central portion is embedded, to have a first air gap (g1),

The outer circumference of the mounting plate 190 is provided with a second magnet 171 so as to have a mounting plate and a second air gap g2.

In this configuration, the voice coil 81 of the diaphragm 80 performs sound generation in the first air gap g1 in which the first magnet 170 is present.

The vibration coil 51 on the vibration disk 50 has a differentiated configuration for generating vibration in the second air gap g2 of the second magnet 171.

As such, the sound generation and the vibration generation are performed independently so that the vibration generated in the inner frame 40 is efficiently transmitted to the housing through the lower case 31 connected to the vibration disk 50.

Second Modification of First Embodiment

A second modification of the first embodiment constructed while sharing the technical idea with the acoustic and vibration generating microspeakers of the present invention is shown in Fig. 5, and the same members as the above-described embodiments will be described using the same member numbers.

In this modification, the modified mounting plate 290 is fixed to the upper end of the inner frame 40 while having a configuration substantially similar to that of the first modification of the first embodiment, and the first magnet is disposed below the mounting plate 290. 170 and a second magnet 171 are provided.

As shown, the mounting plate 290 has a concave-convex shape so that the first magnet 170 and the second magnet 171 are separately received.

The mounting plate 290 serves as a plate on the upper side of the first magnet 170 and the second magnet 171, and separate plates 291 and 291 ′ are disposed below the first magnet 170 and the second magnet 171. And attaching to form the first air gap g1 and the second air gap g2.

The voice coil 81 of the diaphragm 80 and the vibration coil 51 of the vibration disk 50 are configured to operate in the first air gap g1 and the second air gap g2.

By constructing as described above, the pair of first magnets 170 and the second magnets 171 inside the inner frame 40 drive the voice coil 81 and the vibration coil 51 with the increased magnetic flux to increase the output. Can be imported.

In the above configuration, the vibration generated in the inner frame 40 is efficiently transmitted to the entire housing through the lower case 31 which is also bonded to the vibrating disk 50.

[Basic Example of Second Embodiment]

[Microspeaker of bone only mode]

According to the present invention, a second embodiment configured as a bone conduction-only mode by mechanical vibration of a coil is shown in FIG. 6, and the same members as the above-described embodiments will be described with the same member numbers.

In the case of the boneless conduction-only micro speaker (MSB), which does not have an acoustic generator, the acoustic diaphragm is not mounted, and thus, has a relatively simple configuration.

The housing H is composed of an upper case 30 and a lower case 31, and the vibrating disk 50 is also fixed to the lower case 31 central projection 31 ″.

The yoke plate 160 is mounted on the upper portion of the inner frame 40, the magnet 370 is positioned below the yoke plate 160, and the plate 162 is attached to the magnet 370, as shown in the figure. g).

The vibration disk 50 is fixed to the inner frame 40, the vibration coil 51 for vibration generation attached to the center side is located in the air gap (g) to operate the electrical signal is converted into vibration, The converted vibration is transmitted to the entire housing H through the lower case 31.

[First modification of the second embodiment]

Bone conduction-specific microspeakers (MSBs) as a first variation of the second embodiment are shown in FIG.

In this modification, unlike the basic example of the second embodiment, the first magnet 370 and the second magnet 371 are mounted on the yoke plate 160 to increase the magnetic flux interacting with the vibration coil 51. It was.

The overall operation of the first modification is the same as the basic example of the second embodiment.

The thickness, the number of windings, and the impedance of the voice coil 81 and the vibration coil 51 of each of the above-described embodiments may be appropriately experimentally distributed to enable level adjustment between sound and vibration. Since can be obtained by repeated experiments and calculations, etc. are not presented in the present invention.

11 shows an example in which the microspeaker for generating sound and vibration of the present invention is applied to a cellular phone.

When the microspeaker MS of the present invention is applied as a speaker of the mobile phone M, the electric signal applied to the voice coil 81 and the vibration coil 51 can be set in software so that the mobile phone M can be set. Allows the user to select on the settings screen (CT).

For example, as shown in Figure 11, by selecting the speaker mode setting menu, any one of the sound speaker mode, vibration speaker mode, composite mode, it is usually set to the sound speaker mode, vibration when using in a place with high noise You can set speaker mode or composite mode, or set vibration speaker mode for calls for personal privacy protection.

In addition, as shown in the cross-sectional view of Fig. 1, the inner frame 40 has a floating configuration, but as shown in the graph of the frequency response characteristic of bone conduction vibration of Fig. 12, the peak value of the amplitude (intensity) at the resonance frequency f ₀ . Since (α) exists and tends to distort the characteristics of the speaker, it is also preferable to intervene the braking material S as a ring-shaped cushioning member between the inner frame 40 and the bottom of the lower case 31 to absorb it. Do. A is a characteristic diagram before use of the braking agent S which is a buffer material, and B is an improved characteristic diagram after use.

This braking material (S) may be used as a variety of elastic materials that can alleviate the impact can be applied to all embodiments and modifications thereof.

According to the present invention as described above, one or two magnets, voice coil, vibration coil, yoke plate is located in the inner frame, and improves the degree of freedom of vibration by transmitting the mechanical vibration generated in the inner frame directly to the housing The response characteristics can be improved.

In particular, in the generation of bone oscillation, the vibration transmission path is improved by the case of the microspeaker, thereby eliminating the interference of the vibration, and efficiently transmitting the vibration to the input signal.

Therefore, in normal times, you can hear the sound through the airway by air vibration, in the elderly, deaf or noisy environment, there is an effect that can be heard through the bone bones by mechanical vibration.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional view showing a basic example of a first embodiment of a configuration for a compound mode of a microspeaker for sound and vibration generation according to the present invention;

Figure 2 is an exploded perspective view of Figure 1 which is an exemplary configuration of a microspeaker for sound and vibration generation in accordance with the present invention.

Figure 3 a, b, c is a plan view illustratively showing the shape of a vibration disk which is a diaphragm for generating bone oscillation in the sound and vibration generating microspeaker according to the present invention.

Fig. 4 is a sectional view showing a first modification of the first embodiment for the combined mode of the sound and vibration generating microspeaker of the present invention.

Fig. 5 is a sectional view showing a second modification of the first embodiment for the combined mode of the sound and vibration generating microspeaker of the present invention.

Fig. 6 is a sectional view showing a basic example of the second embodiment of the bone conduction mode of the acoustic and vibration generating microspeaker of the present invention.

Fig. 7 is a cross-sectional view showing a first modification of the second embodiment of the bone conduction mode of the acoustic and vibration generating microspeaker of the present invention.

Fig. 8 is a cross sectional view of a conventional multimode microspeaker for sound and vibration generation using one voice coil;

9 is a cross-sectional view of a conventional microspeaker in combination mode for sound and vibration generation using two voice coils.

10 is a cross-sectional view of a conventional bone conduction vibration generating microspeaker with a mastoid.

11 is an explanatory diagram showing an application example in which the microspeaker for sound and vibration generation of the present invention is applied to a cellular phone.

12 is a graph illustrating the change in the frequency response characteristics of the vibration for bone conduction when the braking material is attached to the sound and vibration generating microspeakers of the present invention.

* Explanation of symbols for the main parts of the drawings *

30: upper case

31: lower case

32: outer frame

40: internal frame

50: vibrating disc

80: diaphragm

Claims (10)

A sound and vibration generating microspeaker for simultaneously generating vibrations for bone conduction of sound and sound signal conversion, The micro speaker is configured to be housed in a single body in a housing composed of an upper case 30, a lower case 31 and an outer frame 32, The voice coil 81 fixed to the diaphragm 80 for sound generation, the vibration coil 51 for vibration generation fixed to the vibration disk 50, and the voice coil 81 and the vibration coil 51 correspond to With one or two magnets, The diaphragm 80 for sound generation is fixed to the outer case 32, and the vibration disk 50 for vibration generation is fixed to the inner frame 40 to perform sound generation and vibration generation. Acoustic and vibration generating microspeakers, characterized in that. The method of claim 1, The voice coil 81 fixed to the diaphragm 80 for sound generation and the vibration coil 51 for vibration generation are housed in an inner frame 40 that is elastically fixed on the vibration disk 50 and the housing. (H) Sound and vibration generating microspeakers, characterized in that driven in a floating state (floating) in the room. The method of claim 2, The vibration generated in the vibration disk 50 is conducted to the entire housing (H) through the lower case 31, the sound and vibration generating microspeakers. A sound and vibration generating microspeaker for simultaneously generating vibrations for bone conduction of sound and sound signal conversion, the microspeakers comprising; It is housed in the accommodation space (G) inside the housing (H) consisting of the upper case 30, the lower case 31 and the outer frame 32, A vibration disk 50 fixed to the lower case 31 and mounted with a vibration coil 51, an inner frame 40 elastically supported by the vibration disk 50, Mounting plate 90 is fixed to the inside of the upper end of the inner frame 40 to form an air gap (g1, g2), Ring-shaped magnet 70 for fixing the lower side of the mounting plate 90, The yoke plate 60 of the magnet 70 fixed downward, Diaphragm 80 is fixed to the upper end of the outer frame 32, The voice coil 81 attached to the diaphragm 80 and positioned in the first air gap g1, Sound and vibration generating microspeakers, characterized in that it comprises a vibration coil (51) attached to the vibration disk (50) located in the second air gap (g2). The method of claim 4, wherein The mounting plate 190 fixed to the inner side of the upper end of the inner frame 40 includes a first magnet 170 in a central part by incorporating a central portion thereof to have a first air gap g1, and the mounting plate ( In the outer periphery of the 190 is provided with a second magnet 171 to have a mounting plate and a second air gap (g2), The voice coil 81 of the diaphragm 80 performs sound generation in the first air gap g1, The vibration coil 51 on the vibration disk 50 is a microspeaker for sound and vibration generation, characterized in that it can be replaced with a configuration to perform the vibration generation in the second air gap (g2). The method of claim 4, wherein The mounting plate 290 is fixed to the upper end of the inner frame 40, and provided with a first magnet 170 and a second magnet 171 below the mounting plate 290, and the first magnet 170. ) And the upper side of the second magnet 171, the mounting plate 290 serves as a plate, and a separate plate 291, 291 ′ is attached to the lower side of the first magnet 170 and the second magnet 171. Configured to form one air gap g1 and a second air gap g2, The voice coil 81 of the diaphragm 80 and the vibration coil 51 of the vibration disk 50 operate in the first air gap g1 and the second air gap g2. Acoustic and vibration generating microspeakers, characterized in that the replacement. In order to configure a microspeaker (MSB) dedicated to bone conduction, the housing (H) is composed of an upper case 30, a lower case 31, the vibration disk 50 is fixed to the lower case 31, The yoke plate 160 is mounted on the inner frame 40, the magnet 370 is positioned below the yoke plate 160, and the plate 162 is attached to the magnet 370 to form an air gap g. , Vibration disk 50 is fixed to the inner frame 40, the vibration coil 51 for vibration generation attached to the center side is located in the air gap (g) to operate the electrical signal is converted into vibration and conversion The vibration is transmitted to the lower case 31, the sound and vibration generating microspeakers, characterized in that transmitted to the entire housing (H). The method of claim 7, wherein The first and second magnets 371 and 371 are mounted on the yoke plate 160 to increase the magnetic flux interacting with the vibration coil 51. . The method according to any one of claims 1 to 8, The oscillating disk 50 for generating bone conduction vibrations is formed of a plurality of bridge slits S1, S2, .. which are arc-shaped perforated slits along the center C thereof as elastic thin plates, radially spaced apart. Each bridge slit (S1, S2, ..) has a spring rib (P1, P2, P3 ..) formed by being connected by the slitting connection (C1, C2, C3 ..) serves as an elastic plate Acoustic and vibration generating microspeakers, characterized in that. The method according to any one of claims 1 to 8, Sound and vibration generation, characterized in that the braking material (S) of the elastic material can be further provided between the inner frame 40 and the bottom surface of the lower case 31 to mitigate the impact at the peak value of the amplitude (intensity) Micro speaker.