KR100813156B1 - Microspeaker - Google Patents

Abstract

A micro-speaker is provided to reduce a thickness of the micro-speaker without a back volume, and to obtain an effect to form the back volume at the micro-speaker, in substance. A micro-speaker is made by combining a front module and a rear module. The front module comprises a vibration plate(320), a coil(330) coupled with the vibration plate, and a front frame(310) which the vibration plate is coupled with, and forms a vibration system. The rear module comprises a rear frame(210) and a magnet(230) coupled with the rear frame, and forms a magnetic circuit system. The magnetic circuit system has a yoke(220) installed in a reception part of the rear frame, the magnet installed on the yoke, and a plate(240) installed on the magnet. Gaps corresponding to the coil are formed in the plate and the magnet respectively, and the front frame and the rear frame are coupled for positioning a rear end of the coil to an opening which is formed by the gaps of the plate and the magnet.

Description

Microspeaker {microspeaker}

The present invention relates to a speaker, and more particularly, to a micro speaker used in a portable communication terminal or the like.

BACKGROUND In general, portable electronic devices, such as a notebook computer and a portable electronic device such as an MP3, are provided with a micro speaker for converting an electrical signal into an acoustic signal.

1 is a cross-sectional view showing an example of such a microspeaker. As shown in the drawing, a conventional micro speaker 1 includes a lower case 3 of a predetermined shape injection molded of synthetic resin, and a yoke member 4 and a magnet (sequentially seated on a seating portion of the lower case 3). 5), the plate 6, the diaphragm 8 and the voice coil 7 fixed to the bottom of the diaphragm 8, and the upper portion of the lower case 3, the diaphragm 8 is protected In addition, the upper cover (9) is formed with a plurality of front sound discharge ports (91) for smoothly radiating sound generated from the front (upper) of the diaphragm (8).

Depending on the microspeaker, a sound discharge port may be formed on the exterior case of the device to which the micro speaker is attached without a top cover having a separate sound discharge hole to serve as a top cover.

Accordingly, when a predetermined electric signal is applied to the voice coil 7, the electromagnetic force formed on the voice coil 7 and the magnetic forces formed on the yoke member 4, the magnet 5, and the plate 6 are attracted and repelled. The diaphragm 8 together with the voice coil 7 vibrates in the front and rear directions (up and down in the drawing) to generate a sound signal corresponding to the electric signal. And the sound wave generated in front of the diaphragm 8 is output to the front through the sound discharge port 91 of the upper cover (9).

As shown in this example, the existing microspeaker is formed by substantially coupling the lower case 3 with most of the parts forming the microspeaker from the yoke member 4 to the diaphragm 8, and the diaphragm having a lower case around the diaphragm. Is fixed to.

However, since most of the parts are coupled to the lower case 3 in order to form a microspeaker, there is a problem in that the final entire microspeaker product is defective even if only one of the coupling processes has a process error. In addition, there was an unreasonable point that if a defect occurs, it is almost impossible to produce a micro speaker by removing only the parts combined by a separate defective process and reusing the remaining parts.

On the other hand, the lower case is typically formed with a plurality of rear sound outlet 31 so that the sound generated from the rear (lower in the drawing) of the diaphragm smoothly radiates to the rear as in the example of FIG. The rear sound discharge port 31 is generally formed to improve sound resonance by using a back volume, but internally caused by vibration of the diaphragm 8 in an enclosed space behind the diaphragm 8 in the speaker. As a result of the temporary increase in air pressure, the vibration amplitude of the diaphragm 8 may be narrowed and the vibration may not be smoothly prevented.

In this case, the sound waves generated in front of the diaphragm 8 is output to the front through the sound discharge port 91 of the upper cover 9, the sound waves formed in the rear of the diaphragm 8 is the lower case (3) It is output to the rear through the rear sound discharge port (31).

In a microspeaker, the front sound radiated forward and the rear sound radiated backward are 180 °, so if they cancel each other in any way in a narrow space, it may be impossible to reproduce the bass region close to the original sound. have. For example, if the rear sound is not blocked, the low range is canceled and weakened, and the sound is mainly focused on the high range, making it difficult to reproduce the natural sound. Accordingly, a rear enclosure 130 may be installed to form a back volume 133 having a predetermined size in the rear of the micro speaker to block the rear sound emitted to the rear of the micro speaker.

However, it is practically difficult to install a sufficient volume of back volume in a microspeaker that adds thickness and miniaturization. That is, in order to improve the bass characteristics, the larger the volume of the back volume is, the more advantageous, but the size of the back volume is limited in the microspeaker that pursues thinning and miniaturization. On the other hand, when the back volume is small in the microspeaker, the amplitude of the diaphragm is narrowed and the sound is shifted to the high range as the air pressure increases inside the rear back volume, similarly to the case where the rear sound discharge port 31 is not installed. Is generated.

Therefore, most microspeakers are not designed to form a back volume separately, but the external case of the apparatus to which the micro speakers are mounted is designed to serve as the back volume.

However, in reality, the sound emitted into the exterior case is reduced as the space inside the exterior case decreases due to the miniaturization and thinning of the exterior case. Leaks into. Therefore, the user can not only listen to the leakage sound leaking from the inside of the outer case at the same time with the direct sound radiated directly through the micro-speaker at the same time there was a problem that the sound is cloudy and the resolution is lowered.

The present invention is to alleviate the above-described problems of the conventional microspeaker structure and installation, and to provide a microspeaker having a structure that can reduce the disposal of parts due to defects and defects in the process while allowing the production process to operate flexibly. For the purpose of

In addition, an additional aspect of the present invention can be easily mounted on a thinner device, and is less affected by the internal structure of the device to be mounted, and cancels the low frequency interference due to the sound traveling behind the diaphragm through the space formed therein. It is an object of the present invention to provide a microspeaker capable of reducing the clouding of sound caused by a leaking sound.

The microspeaker of the present invention for achieving the above object has a magnetic circuit system having a diaphragm and a front module and a magnet coupled to the rear frame and the rear frame having a vibration plate and a coil coupled to the vibration plate and a front frame to which the vibration plate is coupled. It is characterized by consisting of a rear module forming a.

In the present invention, the magnetic circuit system is generally provided by mounting the yoke on the seating portion of the rear frame, and sequentially stacking magnets and plates inside the yoke, and generally, the front module is disposed in the gap (gap space) between the yoke and the magnet. The front frame and the rear frame are combined in a form in which the rear end of the coil is located.

In order to achieve the additional object of the present invention, the microspeaker of the present invention is formed such that the front frame is formed in a first space which is distinguished from the region where the diaphragm is formed and is located outside (the peripheral side) of the region where the diaphragm is formed, The frame is formed to have a second space located outside the region where the magnet is installed, and a portion of the periphery of the region where the diaphragm is formed communicates with the second space, and the second space communicates with the first space, but the space in front of the diaphragm. And is characterized in that it is formed to be blocked.

Separating ribs may be formed in the rear of the front frame in order to distinguish the region where the diaphragm is formed and the first space, and the separating rib may be formed at the rear, and the peripheral end of the diaphragm may be the upper end of the diaphragm or the inner surface of the separating rib. It may be in close contact with some.

The area in which the magnet located behind the diaphragm is installed and the second space may be distinguished through seating ribs formed in the rear frame, but are in communication with each other spatially, and generally, the first space, the second space, and the rear of the diaphragm. The space in the area where the magnets are installed is passed through each other but blocked from the outside and sealed.

In the present invention, the front frame or the rear frame outer surface extended around the diaphragm or around the magnet installation area to form the first space and the second space or the first space and the second space is connected to and used with a device equipped with a micro speaker. Possible antennas, electrical terminals for connecting to the outside, and the like can be installed.

According to the present invention, the microspeaker parts are largely divided into two parts, and the two parts are finally combined to complete the microspeakers, thereby exhibiting process flexibility compared to the process of producing one from the beginning.

The replacement is possible even when a defect occurs in one part, so the other part is not affected, thereby reducing the problem of discarding the entire microspeaker by one part.

In addition, according to an additional aspect of the present invention, while reducing the thickness of the microspeaker to the level without the back volume has the effect of forming the back volume in the microspeaker substantially. Therefore, by reducing the influence of the microspeaker by the installation environment in a mobile phone or other applied device, the sound quality provided at the time of design can be maintained even after the installation of the applied device. It can have an effect of reducing the degree.

In addition, as the case area is increased due to lateral expansion, it is easy to provide antennas necessary for application devices such as mobile phones on the front and rear of the case (frame) outside, so that it can be provided in the form of modules. It may also have an additional effect.

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

Figure 3 is an exploded perspective view of the microspeaker showing the configuration of an embodiment according to the present invention, Figure 4 is a perspective view showing a state in which the front module is assembled in the embodiment of Figure 3, Figure 5 is a dotted line portion of Figure 4 6 is a perspective view illustrating an assembled state of a rear module, and FIG. 7 is a cross-sectional view in a state in which a front module and a rear module are coupled to each other.

In the embodiment of Figure 3, the microspeaker is a front module portion consisting of a diaphragm 320 consisting of the front frame 310, the edge 321 and the main body 323, the coil 330 coupled to the rear portion around the main body 323 And a rear module composed of a rear frame 210, a yoke 220 installed on a seating portion of the rear frame, a magnet 230 installed on the yoke 220, and a plate 240 installed on the magnet 230. Are distinguished.

The front module includes a diaphragm 320 and a diaphragm 320 having a flange portion attached to a front frame 310 having a plurality of front sound discharge ports 315 and a rear end of an oval-shaped rib 313 formed on the front frame 310. The voice coil 330 is coupled to. Two terminals of the voice coil 330 are connected to one end of the two electrical terminals 340 through a flexible printed circuit board (FPCB: not shown), and the other end of the electrical terminal 340 is connected to the front frame 310. Passed through the provided resonance hole 318 is drawn out.

The diaphragm 320 is divided into an edge 321 and a main body 323. The edge 321 is made of a soft and low density material, and the body 323 is preferably made of a hard material having a high elasticity and a low density. Various materials have been developed to meet the required performance of these edges. For example, coating fabrics, foamed polyurethane rubber, elastomers, and the like are used, and silicone resins have attracted much attention recently. The edge portion and the main body portion may be formed integrally by varying the thickness and shape of the same material, but is usually formed by a separate material and then formed by combining the two parts by ultrasonic fusion or adhesion.

There is an elliptical dividing rib 313 covering an area in which the front sound emitting outlet 315 is formed in the front frame 310, and the peripheral rib 311 is also formed at the quadrilateral peripheral end of the front frame 310. The space from the outside of the elliptical dividing rib 313 to the peripheral rib 311 at the peripheral end forms the first space of the present invention. At one corner of the quadrilateral there is a path rib 318 and a duct cover 319 which together with a portion of the front frame 310 form a duct portion D. One resonance hole 318 is formed in the front frame 310 in the duct portion (D). The duct part is designed to give Helmholtz resonance to the microspeaker formed by combining the front module and the rear module, and the path rib 317 and the duct cover 319 of the duct part have a rear sound traveling behind the diaphragm 320. Guided to form a path to the resonance hole 318.

The rear module has a seating rib 213 protruding forward while being elliptical in the center of the rear frame 210 as shown in FIG. 6 and a peripheral rib 211 protruding forward in a quadrilateral shape at the peripheral end thereof. The space between these ribs becomes the second space of the present invention.

A hole 215 is formed in the rear frame inside the seating portion rib 213 forming an elliptical shape of the center portion, and the seating portion rib 213 and the hole form a seating portion. The seating part is provided with the yoke 220, the magnet 230, and the plate 240 in order toward the front. When the magnet 230 and the plate 240 have gaps 231 and 241 formed therebetween the center and the periphery, and the yoke 220 has two holes or grooves formed therein to install the yoke 220 in the rear frame 210. It can be used to align the front and rear modules. The rear end of the coil 330 is coupled to the front module and the rear module such that the gap 231 of the magnet and the gap 241 of the plate is located in the gap 250 space formed by the connection.

Figure 7 is a cross-sectional view showing a state in which the front module and the rear module is coupled in one embodiment of the present invention. The rear end of the peripheral rib 311 protruding rearward from the peripheral end of the front frame 310 in the front module and the front end of the peripheral rib 211 protruding forward from the peripheral end of the rear frame 210 in the rear module are bonded and The space between the rear module and the front module constitutes a space separated from the outside as a whole. The seating ribs 213 constituting the seating portion of the rear frame 210 are shifted from each other without contact with the oval-shaped rib 313 of the front frame 310, and thus, with the front end of the seating rib 213 forming the seating portion. Air and sound are free to move between the space behind the diaphragm 320 and the second space 260 as a gap between the rear ends of the division ribs 313. In addition, since the second space 260 and the first space 360 also communicate with each other, the rear sound may be guided to the first space 360.

The second space 260 and the first space 360, which are connected to the rear space of the diaphragm 320, substantially form a back volume formed by a conventional rear enclosure. In a microspeaker that forms a rear enclosure, the back volume is the inner surface of the front frame 310 or the first space 360 facing the first space 360 because its main purpose is to block and eliminate rear sound. It may be equipped with a nonwoven fabric or cotton or other sound absorbing material. In this case, it may have an effect of preventing interference due to reflection of sound propagating therein.

In this embodiment, the front frame or the rear frame is extended laterally compared to the area where the diaphragm is conventionally installed so that the outer surface area is increased, so that the antenna required for the apparatus to which the microspeaker is mounted using the expanded flat surface area is used as a microspeaker. If installed on the front or rear frame outer surface of the supply in the form of a module may facilitate the assembly process of devices such as mobile phones.

On the other hand, a part of the rear sound guided to the first space 360 may be released to the front of the microspeaker through the resonance hole of the duct portion may also play a role of reinforcing the low frequency sound. The rear sound emitted forward through the resonance hole has a difference in the sound source position and the front sound emitted directly in front of the diaphragm, and there is a difference in the path, so that it is possible to solve the problem of offset interference. Therefore, in a broad sense, the first space 360 and the second space 260 may be considered to be directly blocked from the space located in front of the diaphragm despite the existence of the resonance hole.

FIG. 8 is a comparison graph showing sound intensities (dB) for each frequency band when an electrical signal having the same intensity is applied to a voice coil for an embodiment of the present invention and a conventional micro speaker, and FIG. 9 is an embodiment of the present invention. It is a comparison graph showing the negative distortion ratio (%) for each frequency band when the same electrical signal is applied to the voice coil for the example and the conventional microspeaker.

According to these comparison graphs, according to one object of the present invention, when the second space and the first space were formed in the rear frame and the front frame to the outer side of the magnet mounting region and the diaphragm mounting region, respectively, the conventional microspeakers were used. It can be seen that the deviation of the overall sound into the high frequency band is greatly reduced, so that the sound intensity in the low frequency band is enhanced, and the ratio of the low frequency band is significantly reduced.

1 and 2 are cross-sectional views showing examples of a conventional microspeaker;

Figure 3 is an exploded perspective view of the microspeaker showing the configuration of an embodiment according to the present invention,

Figure 4 is a perspective view showing a state in which the front module is assembled in the embodiment of Figure 3,

FIG. 5 is a perspective view showing a detailed configuration of a duct portion which is a dotted line portion of FIG. 4; FIG.

6 is a perspective view showing the assembled state of the rear module,

7 is a sectional view in a state in which the front module and the rear module are coupled;

FIG. 8 is a comparison graph showing sound intensity (dB) for each frequency band when an electric signal having the same intensity is applied to a voice coil for an embodiment of the present invention and a conventional microspeaker. FIG.

FIG. 9 is a comparison graph showing a negative distortion ratio (%) for each frequency band when the same electrical signal is applied to the voice coil for one embodiment of the present invention and a conventional micro speaker. FIG.

Claims (9)

A front module comprising a diaphragm and a coil coupled to the diaphragm and a front frame to which the diaphragm is coupled to form a vibration system; And And a rear module having a rear frame and a magnet coupled to the rear frame to form a magnetic circuit system. The method of claim 1, The magnetic circuit system includes a yoke provided on a seating portion of the rear frame, the magnet provided on the yoke, and a plate provided on the magnet. The method of claim 2, A gap corresponding to the coil is formed in the plate and the magnet, respectively, and the rear end portion of the coil is coupled to the front frame and the rear frame such that the gap is formed by the gap formed by the gap between the magnet and the plate. Micro speaker characterized in that the. The method of claim 1, The diaphragm is a microspeaker comprising a main body in which the coil is formed on the rear of the periphery of the rear of the periphery and an edge formed outwardly from the periphery of the main body. The method of claim 1, The front frame is formed to form a first space which is located outside the area where the diaphragm is formed and is opened toward the rear while being separated from the area where the diaphragm is formed. The rear frame is formed to have a second space located outside the area where the magnet is installed and opened toward the front, A part of the area around which the diaphragm is formed is in communication with the second space to the rear, and the second space is communicated with the first space, characterized in that the microspeaker is formed so as to be blocked from the space in front of the diaphragm . The method of claim 5, wherein In order to distinguish between the area where the diaphragm is formed and the first space in the front frame, a front frame division rib protruding to the rear is formed, and a periphery of the diaphragm is formed on the front frame division rib. Microspeaker characterized in that the close contact with the top or inner side. The method of claim 5, wherein And a part of the front frame defining the first space, the hole facing the front frame forward. The method of claim 7, wherein And a duct part including a path rib and a cover for forming a path connected to the hole in a part of the first space. The method of claim 5, wherein Microspeakers, characterized in that the antenna is connected to the front frame or the rear frame outer surface is used to be connected to the device to be mounted.

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