KR200417799Y1 - Electroacoustic conversion unit having an output structure of the same phase bass reversal method - Google Patents

Abstract

Electroacoustic conversion unit having an output structure of the same phase bass reversal method according to the present invention, the protector 110 having a first discharge port 171 is formed in the center portion is open; A first vibration plate 121 mounted in the first gasket 124 and extending in a lateral direction with a first edge 122 formed at least one convex, and having an internal hollow structure; A first vibration unit 120 formed of a voice coil 123 formed at a lower side of the bottom of the protector 110; The magnetic circuit part 141 including the yoke 144 serving as a diaphragm surrounding the magnet 143 positioned inside the voice coil 123, the outer shell of the yoke 144, and the frame 130. A second vibration part (140) consisting of a supporter (145) having a second edge (147) having a portion recessed downward in a second gasket (148) provided between the sidewalls; The electrode pattern 151 is printed on one surface and the terminal plate 150 coupled to the lower surface of the flame 130 is spaced at a lower portion of the second vibrating unit 140; At least one second discharge port 172 is formed around the inner wall of the 130 in the vertical direction toward the top surface.

Description

ELECTRONIC SOUND-TRANSFORMING UNIT HAVING STRUCTURE OF GENERATING BASS REFLEX WITH SAME PHASE}

1 is a cross-sectional view of a vibration function speaker for the prior art 1.

Figure 2 is a graph showing the speaker output characteristics for the prior art 1.

Figure 3 is a cross-sectional view of a two-way speaker for the prior art 2.

Figure 4 is a graph showing the speaker output characteristics for the prior art 2.

5 is a partial cutaway perspective view and a cross-sectional view of the entire configuration of a unit according to the present invention.

Figure 6 is a partial cutaway perspective view and cross-sectional view of the protector according to the present invention.

7 is a partial cutaway perspective view and a cross-sectional view of the first vibration unit according to the present invention.

8 is a partial cutaway perspective and sectional view of the frame according to the present invention;

9 is a partial cutaway perspective view and a cross-sectional view of the second vibration unit according to the present invention.

10 is a partial cutaway perspective view and cross-sectional view of the terminal plate according to the present invention.

Figure 11 is a partial cross-sectional perspective view and cross-sectional view showing the discharge path of air or sound inside the unit according to the present invention.

12 is a cross-sectional view showing another embodiment of a unit according to the present invention.

Figure 13 is a cross-sectional view of the kernel-type earphone to which the unit according to the present invention is applied.

14 is a graph showing the sound output characteristics of the unit according to the present invention.

Figure 15 is a graph illustrating a comparison of the sound output characteristics of the unit according to the present invention and the prior art 1,2.

Explanation of symbols on the main parts of the drawings

100: unit 147 according to the present invention: yoke guide

110: protector 148: second gasket

120: first vibration portion 150: terminal plate

121: first vibration plate 161: first air chamber

122: first edge 162: second air chamber

123: voice coil 163: third air chamber

130: frame 171: first discharge port

140: second vibration portion 172: second discharge port

142: plate 173: third outlet

143: Magnet 181: York Aerator

144: York 183: third edge

The present invention relates to a bass reflex speaker, that is, an electroacoustic conversion unit having an output structure of a co-phase bass reversal method, and more particularly, bass reversal, but not dependent on an external housing or a cabinet box. The present invention relates to a wideband reproduction (particularly bass) speaker, which is possible as a single unit of independent in-phase output / radiation in which the direction of the bass inverted and inverted coincides with the traveling direction of the main diaphragm for mid / high pitch reproduction.

When the conventional speaker technology is classified into large items, it can be classified into a single unit technology and a system technology in which the unit is mounted.

There are five structural theories of Electro Dynamic, Electro Magnetic, Electro Capacitive, Reverse Piezo, and Ion for single unit technology. Are distinguished.

The largest and most widely used unit technology is the electrodynamic technology. In 2003, a superdirectional unit utilizing ultrasonic Doppler effect and a film-type unit surface-modified on a fluorinated film based on reverse piezo theory were used. Since then, it is actively developed.

Notable prior arts include the vibration function speaker of FIG. 1 and the 2-way speaker of FIG. 2 based on the electrodynamic theory.

1 is a cross-sectional view showing the structure of a dynamic vibration, acoustic composite mode micro speaker according to the prior art 1.

The conventional dynamic vibration, acoustic composite mode micro speaker includes a cylindrical frame 1 and a magnetic circuit portion and a sound generating portion mounted therein. Here, the yoke of the magnetic circuit part is fixed to the leaf spring 2, and the leaf spring 2 is fixed to the frame 1, whereby vibration is generated. Let's look at this more specifically.

The upper cover 3 is coupled to the upper side of the frame 1, the lower cover 4 is coupled to the lower side, the acoustic cover 5 is provided at the upper cover, and the rear vent hole is provided at the lower cover 4. 6) is provided. The sound generating unit includes the first and second vibration units 8 and 9 and the voice coil, and the voice coil receives power by connecting the voice coil lead wire to the PCB electrode terminal. The magnetic circuit portion is composed of a circular plate, a permanent magnet, and a circular yoke, and the magnetic circuit portion acts as a mass of vibration to generate vibration.

The first vibrator 8 is composed of a diaphragm, and the second vibrator 9 is configured as a magnetic circuit. The first vibrator 8 has only a wide range of sound expression possible, and the second vibrator 9 has a constant frequency. Is intended only for vibrational expression. In order to express vibration only, the air gap 7 is formed in the suspension of the second vibration unit 9 so that the sound generated is extinguished.

This prior art is disclosed in Korean Patent Application Publication No. 2000-12495 as an external compound mode micro speaker.

The vibration force generation of the AC-driven dynamic acoustic / vibration combined mode micro-speaker is defined by the lead wire of the voice coil inserted at right angles in the air gap of the magnetic circuit or in the air chamber (the space between the inside of the yoke and the outside of the plate). When a negative electrical signal is induced, an alternating rotating magnetic field corresponding to the positive or opposite direction and a directing magnetic field generated from a permanent magnet react with each other and are attracted or repelled.

At this time, the direction of force generated is determined by the direction of the direct current magnetic flux from the inside of the magnetic circuit air gap to the outside and the direction of the alternating rotation magnetic flux generated in the coil, and acts in the up or down direction based on the cross section of the air gap. Done. At this time, AC electric energy of full duty wave must be applied to the coil in order to repeat up and down in sequence. The magnitude of the generated force is proportional to the magnetic flux density in the air gap, the length of the coil and the magnitude of the current flowing through the coil. In addition, when the reaction angle between the magnetic field generated in the coil and the magnetic field present in the air gap is at right angles, it interacts with the greatest force, and the applied unit is Newton.

The above is a quote from Framing's left-handed rule, and since it is well known about the mutual reaction of two magnetic fields, a detailed description thereof will not be given.

In the conventional vibrating body, the resonant frequency is determined by the correlation between the weight of the entire vibrating part and the rigidity based on the elasticity of the support, and the vibration width is the largest in the resonant part. In addition, the smaller the stiffness of the leaf spring, the braking support, the lower the resonant frequency. It is noted that the magnetic circuit structure has a much larger mass than the diaphragm structure. As a result, when a relatively large magnetic circuit structure is used as the vibration source, it is possible to generate a low frequency vibration frequency that can be easily felt by the human body.

The vibration / acoustic composite mode micro speaker according to the prior art 1 has a theoretical background based on the above-mentioned principle, which is a vibration mode at the maximum resonance point frequency of the magnetic circuit structure, and the frequency from the resonance point frequency of the light diaphragm structure to the maximum audible region. Used in speaker mode to reproduce sound.

In the case of the AC type dynamic vibration / acoustic composite mode micro speaker, by integrating separate components that provide two functional elements into one, a cost reduction effect can be obtained by reducing the number of components included in the mobile phone set. Since it is an AC method, there is an advantage that it is possible to secure the added value of adding various types of vibration functions according to the frequency of the driving signal source.

However, considering the acoustical aspect of the prior art 1 according to Figure 1, because the magnetic circuit portion and the sound generating portion is driven in reverse at the same time to move because the magnetic circuit portion is fixed, the regeneration efficiency is inevitably lowered. In addition, since the suspension of the second vibration unit 9 is a breathable structure, there is a disadvantage in that the bass is canceled and thus it cannot have an excellent bass generating effect.

Figure 2 is a graph showing the state of the synthetic sound characteristics for the prior art 1.

Referring to FIG. 2, it can be seen that the acoustic energy is lowered because the prior art 1 is basically based on reverse phase vibration, and the second vibrator 9 has independent acoustic characteristics due to vibration and the bass within itself cancels out. It can be seen that there is a disadvantage that the renewable energy is extremely small.

3 is a cross-sectional view illustrating a structure of a 2-way speaker according to the related art 2. FIG.

Referring to the configuration of FIG. 3 schematically, a protector 31 having a first discharge port 29 formed of a plurality of holes in the speaker unit 21 mounted inside the housing 20 is bent and formed at a lower portion thereof. It is provided to have the first air chamber 26 between the first vibration plate 24 and two voice coils 22 and 23 are disposed under the first vibration plate 24. These voice coils 22, The lower part of 23 is provided with the 2nd diaphragm 25 which is also bend | molding. The second air chamber 27 is provided between the voice coils 22 and 23 and the second vibration plate 25.

A bottom surface of the speaker unit 21 having a through hole is located below the second vibration plate 25, and a third air chamber 28 is provided between the bottom surface of the speaker unit 21 and the inner wall of the housing 20. The third discharge port 31 is formed at one side of the third air chamber 28, that is, the portion of the outer housing 20.

As can be seen from this configuration, it can be seen that the first vibrating plate 24 reproduces only a high frequency of at least 5 KHz due to the sealed structure, and the generated sound of the second diaphragm 25 is the second and third discharge ports 30. And 31), the result is that the bass is completely canceled and only mid-to-high pitch reproduction above a certain band is possible.

Furthermore, when the first and second vibrating plates 24 and 25 simultaneously operate, the direction of sound emitted from the first to third emission ports 29, 30 and 31 is inversely phased. There is a problem that it is difficult to reproduce the sound in the long low band.

In addition, when one of the second and third discharge ports 30 and 31 is closed to prevent the bass sound from being canceled due to the reverse phase, the second diaphragm 25 is also sealed like the first diaphragm 24, and thus it is impossible to reproduce the bass. There is a disadvantage of losing.

4 is a graph showing the sound acoustic characteristics of the prior art 2 according to FIG.

As can be seen from Fig. 4, the acoustic energy of the second diaphragm (vibrator) 25 is synthesized in the reversed phase at the second and third discharge ports 30 and 31, so that the acoustic energy near the bass resonance frequency is reduced. It can be seen that it disappears rapidly, which shows that there is a problem in sound generation related to bass.

When summarizing the problem of the bass region, which can be said to be a major disadvantage of the prior art 2 according to FIGS. 3 and 4, the phase of the front and rear surfaces of the unit is -180 in the case of a single unit, and thus the longer the bass, the longer the bass wavelength. This is due to the fact that it becomes impossible to hear because it is canceled.

In order to prevent the bass offset phenomenon, a plate-shaped structure for blocking the front and rear surfaces of the unit is called a baffle. The baffle is ideally infinitely expandable but practically impossible, thus forming a space similar to the infinite baffle. It is the cabinet that houses the unit.

This is a key part of the system's technology, which can be subdivided into a hermetic enclosure where the space behind the unit is completely isolated from the outside and a base reflex that connects a portion of the cabinet to the exterior space.

The ideal setting of a closed cabinet space is to be able to realize a low resonant frequency equivalent to the low resonant frequency of a unit in a free space, in order to extend the limit of the low range that can be expressed even when mounted in a cabinet. to be.

At present, as the size of a speaker having a sound generating device such as a portable terminal for information communication is miniaturized, the external propensity of a speaker required in practical surroundings is small, so that even a speaker can be required as little as possible if equal bass can be realized. Speakers are also being developed and marketed as small as possible, and new structures are continuously being developed that can produce lower frequencies with lower frequencies.

Among the cabinet technologies described above, the bass reflex technology, which is capable of miniaturization and moderately low bass extension, is divided into the classic representative technologies of the front load type and the back load type.

Bass reflex technology means that a certain amount of sound emitting space is formed in a part of a closed cabinet, and the air is radiated to the rear of the speaker unit by using a resonance frequency related to the size and thickness of the space and the outlet of the cabinet. It is a technology that expresses even lower bass.

In other words, in order to realize a more maximized bass reproduction in the same unit, a separate cabinet, which is essentially an extended space of infinite baffles, is necessary, but it is possible to reinforce the bass region according to the deformation and development of such a cabinet. There is a need for speaker technology with a new structure, and furthermore, there is a need for a new technology capable of achieving an excellent reinforcement structure in the bass region without a cabinet structure.

The present invention has been devised to overcome the above-mentioned problems of the prior art, and provides a novel structure that enables the bass reflex cabinet function only by the unit itself, so that the bass reflex can be used as the unit itself without a separate external cabinet. The purpose is to provide.

Another object of the present invention is to provide a base copper phase reflex unit in which two separate resonance points can be formed as one coil, and in particular, the phase of the vibration part having a low resonance point that can be enlarged is in-phase reversed to the front of the unit.

In order to achieve the above object, the electroacoustic conversion unit having an output structure of the in-phase bass reversal method according to the present invention, the first outlet 171 is coupled to the upper portion of the frame 130, the center portion is open; Having a protector 110; A first vibration plate 121 mounted in the first gasket 124 and extending in a lateral direction with a first edge 122 formed at least one convex, and having an internal hollow structure; A first vibration unit 120 formed of a voice coil 123 formed at a lower side of the bottom of the protector 110; The magnetic circuit part 141 including the magnet 143 positioned inside the voice coil 123 and the yoke 144 that surrounds the voice coil 123 and serves as a diaphragm, and the yoke 144 A second vibration part (140) consisting of a supporter (145) having a second edge (147) having a portion recessed downward in a second gasket (148) provided between an outer shell and a side wall of the frame (130); The electrode pattern 151 is printed on one surface and the terminal plate 150 coupled to the lower surface of the flame 130 is spaced at a lower portion of the second vibrating unit 140; At least one second discharge port 172 is formed around the inner wall of the 130 in the vertical direction toward the upper surface, and the sound generated by the vibration of the yoke 144 is the second. Inverted and moved through the discharge port 172 is synthesized in the same phase with the sound generated in the first vibration unit 120 and is characterized in that it is output to the first discharge port (171).

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings are not drawn to scale, and like reference numerals in each of the drawings refer to like elements.

5 is a partially exploded perspective view and an assembled sectional view of the unit 100 according to the present invention.

As can be seen from Figure 5, the unit 100 according to the present invention is preferably described on the basis of the assembly order from the top to the bottom with respect to the configuration located inside the frame 130 consisting of a cylindrical shape Consists of the protector 110, the first vibrator 120, the second vibrator 140, the terminal plate 150 forming the lowest layer. Each of these components will be described with reference to the accompanying detailed drawings.

6 is a partially cutaway perspective view and a cross-sectional view of the protector 110 according to the present invention.

Referring to FIG. 6, the protector 110 according to the present invention forms the uppermost part of the unit 100 and provides a basic function of protecting the first and second vibration parts 120 and 140 located therein from external shocks. Composed along the top wall of the frame 130 is made of the same shape as. In the central portion of the protector 110 is formed a first discharge port 171 having an open structure. The first discharge port 171 basically serves as a vent to allow the sound to be emitted to the outside.

In addition, the protector 110 is open to the upper end of the frame 130, the plurality of second discharge port 172 is formed in the first and second vibration unit (120, 140) to be described later does not directly contact the outside The first discharge port 171 serves to cause a certain convergence.

7 is a partial cutaway perspective view and a cross-sectional view showing the configuration of the first vibration unit 120 according to the present invention.

The first vibration part 120 according to the present invention is structurally positioned at a predetermined distance below the protector 110, and is formed in a shape corresponding to the shape of the frame 130 to the protector 110, preferably a cylindrical plate shape. The first vibrating plate 121 extends in the transverse direction, including at least one convex portion, such as embossing, and extends into the first gasket 124 formed along the outer circumferential surface thereof. This is referred to as edge 122.

The voice coil 123 is seated at the lower end of the first vibration plate 121 at substantially the center portion, and one wire 125 of the wires constituting the voice coil 123 extends outside the first gasket 124. . The voice coil 123 has a cylindrical hollow structure, and the magnet 143 of the second vibration unit 140 to be described below is positioned below the hollow portion.

8 is a partial cutaway perspective view and a cross-sectional view showing the configuration of the frame 130 according to the present invention.

As can be seen from Figure 8, the frame 130 serves as a basic housing to the acoustic emission medium of the unit 100 according to the present invention has a cylindrical shape basically the upper surface of the protector 110 is The fitting is coupled and the lower terminal plate 150 is coupled. The inner side of the frame 130 has a hollow structure so that the same configuration as the first and second vibrating parts 120 and 140 may be located. In the inner circumferential surface portion of the frame 130, a plurality of second outlets 172 are preferably arranged along the inner circumference of the frame 130 in the vertical direction, that is, parallel to the longitudinal direction of the frame 130, up to the upper surface. It is formed radially. Specifically, the second discharge port 172 is located between the inner wall of the frame 130 and the outer side of the second gasket 148 of the second vibration unit 140 to be described later.

On the outer wall of the frame 130, a plurality of third discharge ports 173 penetrated in the transverse direction until the third air chamber 163 to be described later is radially along the outer wall of the frame 130. On the one side of the outer wall is formed a crack is formed in the longitudinal crack (crack) portion due to this crack is formed by the coil lead-out groove 131 to allow the wire of the voice coil 123 to be drawn in and out. .

9 is a partial cutaway perspective view and a cross-sectional view showing the configuration of the second vibration unit 140 according to the present invention.

The second vibrator 140 according to the present invention includes a magnetic circuit part 141 that largely forms a source of magnetic field generation, and a supporter 145 that supports the magnetic circuit part 141 along the outer circumferential surface of the magnetic circuit part 141.

First, the magnetic circuit unit 141 will be described. The magnet 143 formed at the center portion is seated inside the hollow portion of the voice coil 123 and the upper surface of the magnet 143 is provided for preventing the position of the magnet and preventing movement. The yoke (Yoke) surrounding the magnet and the voice coil 123 in a U shape with a plate 142 formed and spaced apart at regular intervals along the outer circumferential surfaces of the magnet 143 and the voice coil 123 as the outer shell of the magnet 143. 144 is provided.

The supporter 145 extends in the lateral direction including a yoke guide 146 for seating and supporting the yoke 114 and a portion recessed downward to the outside of the yoke guide 146 by surrounding the outside of the yoke 144. A second gasket 148 is formed, and the downward depression portion in the second gasket 148 is referred to as a second edge 147.

10 is a partial cutaway perspective view and a cross-sectional view showing the configuration of the terminal plate 150 according to the present invention.

The terminal plate 150 corresponds to a bottom surface of the unit 100, and the electrode pattern 11 is printed on one surface of the terminal plate 150.

In the unit 100 according to the present invention, a space is generated in the lower surface of the protector 110 and the upper surface of the first vibrator 120, which is referred to as a first air chamber 161. 2 The space between the lower surface of the vibration unit 140 and the upper surface of the terminal plate 150 is called the second air chamber 162, and the first vibration unit 120, specifically, the lower portion of the first edge 122 The space between the surface and the second vibrator 140, specifically, the upper surface of the second edge 147 is called a third air chamber 163.

As can be seen from the above configuration and the accompanying drawings, the protector 110, which basically constitutes the upper structure of the unit 100 according to the present invention, is opened by the first discharge port 171 and forms a terminal plate. 150 is sealed.

The operation of the unit 100 according to the present invention will be described with reference to the accompanying drawings based on the above configuration.

The unit 100 according to the present invention has two vibration parts called first and second vibration parts 120 and 140, but the second vibration part 140 is composed of a magnetic circuit, and the first and second vibration parts 120 and 140 are also provided. ) Is driven by one voice coil 123. Since the first and second vibrators 120 and 140 do not have ventilation holes on their own, both vibrators 120 and 140 may achieve only sound expression.

The first and second vibrators 120 and 140 have the purpose of sound expression, but for more wider sound reproduction, the first vibrator 120 reproduces the sound up to a midrange or higher treble over a predetermined band, and the second vibrator ( 150) is responsible for the sound reproduction function from the bass to a constant mid-band.

The configuration that performs the function of the second diaphragm is the yoke 144 surrounding the magnet 143. In the present invention, the air vibrates directly from the yoke (! 44) of the second vibrator 140. After all, the magnetic circuit unit 141 has a structure for directly vibrating air.

The magnetic circuit unit 141 and the first diaphragm 121 are closely located to each other so that the first diaphragm 121 for the mid-high sound is directly driven by the voice coil 123, and the bass sound of the magnetic circuit unit 141 is reduced. By vibrating the air directly by the yoke 144 and the second diaphragm, it is inverted 'in phase' back to the first diaphragm 121. By this action / reaction, the vibration directions of the first and second vibration parts 120 and 140 are opposite to each other. Accordingly, the unit 100 according to the present invention is capable of reproducing broadband as one electric input channel and making it thin.

As mentioned above, the resonant frequency of a conventional vibrator is determined by the correlation between the equivalent stiffness of the edge and the equivalent mass of the vibrating body.

Based on the above reason, the first vibrating unit 120 having a lower relative mass and the second vibrating unit 140 including a magnetic circuit unit having a higher relative mass may exhibit different resonance regions, and as a result, this phenomenon may occur. One channel, but at the same time, allows the reproduction of sound at different frequencies.

Referring to the drawings, the first diaphragm 121 may be reproduced up to a high-pitched region above a resonance frequency through the shape of the first edge 122 protruding or bending at an appropriate bending angle. In the case of the yoke 144 corresponding to the dedicated second diaphragm, the surface is flat in structure, so that the yoke 144 can be reproduced only from the resonant frequency up to a predetermined frequency. For this reason, the yoke 144 dedicated to the low tone is reproduced from the bass region to the middle portion of the predetermined portion, and the first vibrating plate 121 for the medium and high tone is reproduced from the middle portion to the high tone region of the predetermined portion.

The vibration principle of the second vibration unit 140 of the present invention follows the operation principle of a known acoustic vibration combined function speaker. However, in the conventional vibration function speaker, the resonance of the magnetic circuit part is used for the vibration purpose, but in the present invention, the yoke 143 included in the magnetic circuit part 141 is used as the diaphragm for the bass reproduction.

For the function of vibration only, a low frequency dissipation structure is needed so that sound is not generated at the vibration frequency possible. However, where the purpose of sound generation is to transmit the generated vibrations in the air as far as possible without extinction.

Therefore, the unit according to the present invention, in order to transfer the generated vibration in the air as possible without extinction, the outside of the yoke 144 serving as the second diaphragm to the second edge 147, the communication of the front and rear air is blocked. It forms and transmits the vibration generated directly in the yoke 144 in the air.

11 is an air distribution structure diagram showing an air distribution structure through the discharge port of the unit 100 according to the present invention.

As can be seen with reference to Figure 11, the first to third outlets (171, 172, 173) according to the present invention are separated from each other to induce the flow of air independently, bar coil 123 and the magnet 143 in the interaction The sound generated by the first diaphragm 121 is emitted through the first discharge port 171 via the first edge 122, and the sound generated by the yoke 144 is the second edge 147 and the first sound. 2 is discharged through the second discharge port 172 via the air chamber 162 and in phase confluence with the sound generated by the first vibrating plate 121 in the first air chamber 161 to allow the first discharge port 171 to be discharged. ) Is released. In this principle, the sound generated from the second vibration unit 140 according to the present invention is synthesized in the same phase without cancellation.

At the time of vibration, the air of the third air chamber 163 which is formed to be compressed and expanded at the contact surface of the yoke 141 corresponding to the lower surface of the first vibration plate 121 and the second vibration plate is discharged from the third discharge port ( Although the name is expressed as the discharge port, it is guided to the position of the range that is not offset with the first discharge port 171 through the simultaneous acting as the inlet of the air (163). As a result, the reproduction frequency characteristic of the first vibration unit 120 may also be emitted by the third discharge port 163.

In this manner, the sound generated by the first first vibrator 120 and the second vibrator 140 may be synthesized through the reverse phase or the second discharge port 172. Is generated is emitted in the same phase as the first vibration unit (120).

12 is a cross-sectional view showing another embodiment of a unit according to the present invention. The second to fourth embodiments shown in FIG. 12 describe additional structures that can appropriately guide and control the flow of air to vibrations generated in yoke 144. 12 (a) to (c), the third discharge port 173 does not exist, but replaces its role by a separate vent.

Figure 12 (a) is a second embodiment of the unit according to the present invention, the yoke vent 182 is additionally formed on the cross section on the plate 142 provided on the magnet 143, but the yoke (! 44) of The bottom surface is bent to extend further vertically up to the terminal plate 150, from which the yoke vents 181 to the bottom of the unit 100 in the vertically downward direction along the inner central portion of the magnet (! 43) and the yoke 144. ) Is formed, and the terminal plate 150 is provided with a third edge 183 which is convex, similarly to the first edge 122 formed on the first gasket 124.

According to this configuration, the vent hole 190 is formed at the bottom of the unit 100 to directly induce the air flow or draw-out flow generated by the vibration of the yoke 144 by the vent hole, and in this process, the third edge 183 performs the same resonant frequency shaping induction role as the first edge 122 described above.

12 (b) is a third embodiment according to the present invention, similar to the structure of the unit (first embodiment) described in FIGS. 5 to 11, but similarly to the second embodiment, the yoke is formed on the upper surface of the plate 142. Aeration bubble 182 is formed therefrom of the terminal plate 150 located below the yoke vent 181 and the yoke vent 181 formed through the central portions of the magnet 143 and the yoke 144. Vent hole 190 is formed in the corresponding portion. By this structure, the air vent 190 induces the withdrawal of air, the air is discharged to the air vent 190 through the second air chamber 162 by the vibration generated from the yoke 144 unit ( The bottom of 100) induces the release of air.

12 (c) is a fourth embodiment of the unit 100 according to the present invention, and the yoke vent hole 181 is formed through the central portions of the magnet 143 and the yoke 144 in the third embodiment. As in the configuration of the example, but the vent hole 190 is not formed in the terminal plate 150, but the vent hole 195 is formed on one side of the first vibration plate 121, specifically the central portion in the yoke 144 The generated vibration is emitted to the upper surface of the unit 100, that is, the first discharge port 171 through the second air chamber 162 and the second discharge port 172.

13 is a cross-sectional view showing a structure in which a unit according to the present invention is mounted in a kernel-type earphone housing.

As can be seen from Figure 13, the unit 100 according to the present invention is mounted in the kernel-type earphone housing 200 is formed with a vent hole 210 on one side to seek a compact sound yet kernel-type earphone It can be applied appropriately to the structure.

14 is a graph showing the output sound curve by the unit 100 according to the present invention.

As can be seen from Figure 14, when looking at the frequency characteristics of the second vibrator 140 there is no separate air vent around the sound loss due to its own structure and the sound is emitted through the second discharge port 172 Since it has a non-sealed state, the expression of much higher volume than that of the prior art 1 can be achieved, and the frequency band is widened.

In addition, when the sound generated through the first and second vibrators 120 and 140 is synthesized by the first discharge port 171, the operating directions due to the vibrations of the first and second vibrators 120 and 140 are mutually different. On the contrary, the sound generated from the second vibrator 140 is reversed and output through the second discharge port 162, so that the sound signal of the synthesized part has the same phase. Is extended from the bass reproduction limit frequency corresponding to the bass resonance portion of the second vibration unit 140 to the limit frequency of the first vibration unit 120.

In addition, the regeneration frequency characteristic of the first vibrator 120 also has a characteristic that the frequency band is widened because the first vibrator 120 does not form a sealed structure by the structure emitted by the third discharge port 163.

15 is a graph illustrating a comparison of acoustic characteristics between the unit 100 according to the present invention and the above-described prior arts 1 and 2.

As can be seen from Figure 15, it can be seen that the unit according to the present invention has excellent characteristics, especially in the bass region compared to the prior arts 1 and 2, and also has a wide range of frequency bands.

As described so far, the configuration and operation of the unit according to the present invention have been expressed in the above description and the drawings, but this is merely an example, and the spirit of the present invention is not limited to the above description and the drawings, and the technical idea of the present invention. Of course, various changes and modifications are possible without departing from the scope.

As described above, the unit according to the present invention provides a structure that can effectively output the sound without relying on the outer housing or the cabinet box without forming the first and second vibrating portion in a closed structure frequency of the output sound The band has the advantage of being wider.

In particular, the output acoustic energy is increased by inverting in phase with the generated sound of the first vibration unit without canceling the bass sound generated in the second vibration unit, thereby improving the bass region.

Claims (13)

An electroacoustic conversion unit having an output structure of in-phase bass inversion, A protector 110 that is coupled to an upper portion of the frame 130 but has a first outlet 171 having a central portion open; A first vibration plate 121 mounted in the first gasket 124 and extending in a lateral direction with a first edge 122 formed at least one convex, and having an internal hollow structure; A first vibration unit 120 formed of a voice coil 123 formed at a lower side of the bottom of the protector 110; A magnetic circuit unit 141 having a magnet 143 positioned inside the voice coil 123 and a yoke 144 that surrounds the voice coil 123 and serves as a diaphragm, and an outer shell of the yoke 144. A second vibration part (140) comprising a supporter (145) having a second edge (147) having a portion recessed downward in a second gasket (148) provided between the sidewall of the frame (130); The electrode pattern 151 is printed on one surface and the terminal plate 150 coupled to the lower surface of the flame 130 is spaced at a lower portion of the second vibrating unit 140; A plurality of second discharge holes 172 are formed around the inner wall of the frame 130 in the vertical direction toward the upper surface thereof, and the sound generated by the vibration of the yoke 144 may be generated. 2, the electro-acoustic conversion unit, characterized in that the inverted movement through the discharge port (172) is synthesized in phase with the sound generated in the first vibration unit (120) and then output to the first discharge port (171). The method of claim 1, A first air chamber 161 is formed between the protector 110 and the first vibration plate 121, and a second air chamber 162 is formed between the second vibration unit 140 and the terminal plate 150. An electroacoustic conversion unit, characterized in that is formed. The method of claim 1, Electroacoustic transducer unit, characterized in that the third air chamber (163) is formed between the first and second edges (122,147) in the frame (130). The method of claim 3, wherein Electro-acoustic conversion unit, characterized in that the third discharge port (173) which is penetrated in the transverse direction from the side wall of the frame (130) to the inner third air chamber (163). The method according to claim 1 or 4, The air of the third air chamber 163 compression-expanded at the lower surface of the first vibration plate 121 and the contact surface of the yoke 144 is guided through the third discharge port 173, Acoustic conversion unit. The method of claim 1, The yoke guide 146 is formed around the yoke 144, an electroacoustic conversion unit. The method of claim 1, Electromagnetic conversion unit, characterized in that the plate 142 is provided on the upper end of the magnet (143). The method according to claim 1 or 2, The second acoustic outlet 172 is formed through the top of the outer peripheral surface of the second air chamber 162, the electroacoustic conversion unit. The method of claim 1, The yoke vent hole (181) is formed in the center of the magnet (143) and the yoke (144), the electro-acoustic conversion unit. The method according to claim 1 or 9, The yoke 144 is bent from the bottom surface is formed extending toward the terminal plate 150, the terminal plate 150 is characterized in that it comprises a convex third edge 183, electroacoustic conversion unit. The method according to claim 1 or 9, A vent hole 190 is formed in the central portion of the terminal plate 150, an electroacoustic conversion unit. The method according to claim 1 or 9, One side of the first vibration plate 121, characterized in that the ventilation hole (195) is formed, the electroacoustic conversion unit. The method of claim 1, The yoke (144) is U-shaped, characterized in that surrounding the outside of the magnet (143) and the voice coil (123), electrical conversion unit.

Images