JP2016015530A - Speaker, electronic apparatus and mobile device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker that can perform reduction of the weight and resource saving while securing coupling strength between the yoke of a magnetic circuit and a frame.SOLUTION: A pawl provided to a frame is engaged with a step provided on a yoke of a magnetic circuit to fix and join the frame to the yoke while the pawl is elastically deformed, thereby performing the joint between the frame and the magnetic circuit. Accordingly, weight reduction and resource saving can be performed while the joint strength is secured, and enhancement of the production and reduction of the cost can be implemented.

Description

  The present invention relates to a speaker used for in-vehicle use or various audio equipments.

  In recent years, in the automobile industry, weight reduction and resource saving for improving fuel efficiency have been strictly demanded from the viewpoint of global environment.

  For this reason, with respect to in-vehicle speakers mounted on automobiles, the market demand for weight reduction and resource saving is unavoidable.

  From the background described above, these in-vehicle speakers have been continuously pursued with technologies for the conflicting demands of miniaturization and weight reduction and high performance due to high sound pressure and high output.

  Therefore, in order to meet such demands, a magnetic circuit that has an extremely high influence on the weight of the speaker is replaced with a large external magnetic type magnetic circuit using a conventional ferrite magnet. A speaker that uses a neodymium magnet to reduce the size of the magnetic circuit to an internal magnet type and significantly reduce its weight has also been realized.

  Hereinafter, a conventional speaker will be described with reference to the drawings.

  FIG. 7 is a cross-sectional view of a conventional speaker, and shows a cross-sectional view of a tweeter having an internal magnetic circuit.

  As shown in FIG. 7, the magnet 2 is sandwiched between the yoke 1 and the plate 3 to constitute an internal magnet type magnetic circuit 4.

  A frame 6 made of resin is coupled to the yoke 1 of the magnetic circuit 4, and the outer periphery of the diaphragm 7 is coupled to the peripheral portion of the frame 6.

  One end of the voice coil 8 is coupled to the diaphragm 7 and the opposite end is coupled so as to fit into the magnetic gap 5 of the magnetic circuit 4.

  The equalizer 10 is bonded to the front surface of the diaphragm 7.

  Here, the yoke 1 and the frame 6 are joined by inserting a part of the yoke 1 into the frame 6 to which an adhesive has been applied and bonding them together.

  In this case, when sufficient bonding reliability cannot be obtained only by adhesive bonding only by application of an adhesive, the yoke 1 and the frame 6 are provided by providing a flange portion on the yoke 1 and fitting it with the frame 6. Some of the configurations ensured coupling reliability.

  In addition, a conventional full range or woofer has a configuration as shown in FIG.

  FIG. 8 is a cross-sectional view of a speaker according to another conventional embodiment, and shows a cross-sectional view of a full range or woofer having an internal magnetic circuit.

  That is, as shown in FIG. 8, the magnet 2 is sandwiched between the yoke 1 and the plate 3 to constitute an internal magnet type magnetic circuit 4.

  A frame 6 made of resin is coupled to the yoke 1 of the magnetic circuit 4.

  Then, the outer periphery of the diaphragm 7 is coupled to the peripheral edge of the frame 6, and one end of the voice coil 8 is coupled to the diaphragm 7, and the other end is held centrally by the damper 9, while the magnetic circuit 4. The magnetic gap 5 is coupled so as to be fitted.

  The dust cap 11 is bonded to the front surface of the diaphragm 7.

  Here, a method of coupling the yoke 1 and the frame 6 will be described with reference to FIGS. 9, 10, and 11.

  FIG. 9 is a plan view of a conventional yoke, FIG. 10 is a plan view of a main part of a conventional frame, and FIG. 11 is a plan view of a main part showing a coupling state between the conventional yoke and the frame.

  As shown in FIG. 9, the yoke 1 is provided with a flange 1a, and further provided with a notch 1b.

  As shown in FIG. 10, the frame 6 is provided with a protrusion 6 a at a fitting portion with the yoke 1.

  Then, as shown in FIG. 11, after the notch 1b provided in the flange 1a of the yoke 1 and the projection 6a provided in the frame 6 are fitted, the yoke 1 or the frame 6 is rotated. Thus, the notched portion 1b of the yoke 1 and the protruding portion 6a of the frame 6 are coupled by shifting.

  For example, Patent Document 1, Patent Document 2, and Patent Document 3 are known as prior art document information relating to the invention of this application.

JP 2005-203972 A JP 2006-254038 A JP 2006-186517 A

  In conventional loudspeakers, the method of joining the yoke 1 and the frame 6 is often adhesively bonded with an adhesive, so the strength and reliability in the connection must be relied only on the adhesive strength of the adhesive. Absent.

  Therefore, in this case, it is considered that there is no problem in an environment where a small and light magnetic circuit is used, and the environment in which the temperature changes is small and there is almost no influence of vibration or the like. In an environment where the change is severe and the influence of vibration or the like is large, the adhesive strength using only the adhesive cannot be said to be sufficient in terms of strength and reliability.

  For this reason, when the bonding strength and reliability between the yoke 1 and the frame 6 are not sufficient only by the adhesive force by the adhesive, the coupling strength or The configuration ensures reliability.

  However, in this case, a processing step for providing the flange portion on the yoke 1 is required, and a structure setting and a processing step for providing the fitting portion on the frame 6 are also required. A joining step for fitting the fitting portion of the frame 6 is also required.

  That is, providing the collar 1a on the yoke 1 significantly reduces the productivity of the yoke 1 and makes it expensive in terms of processing steps.

  Further, a notch portion 1b is provided in the flange portion 1a of the yoke 1, a projection portion 6a is provided in a fitting portion of the frame 6 with the yoke 1, and after fitting these, the yoke 1 or the frame 6 is rotated. Thus, in the case of a coupling configuration in which the notch portion 1b of the yoke 1 and the projection portion 6a of the frame 6 are displaced, the step of providing the notch portion 1b in the flange portion 1a of the yoke 1, and the yoke 1 of the frame 6 The process of providing the protrusion 6a in the fitting part and the process of rotationally coupling the yoke 1 or the frame 6 are necessary, and the price becomes very expensive.

  On the other hand, when the yoke 1 provided with the flange 1a and the frame 6 are joined by the joining method of the yoke 1 to the frame 6 by insert molding, the productivity reduction as a joining process is small, but the insert molding is performed. The mold equipment necessary for this is expensive, and as a result, the joining method by insert molding becomes expensive.

  As described above, in order to improve the coupling strength and reliability between the yoke 1 and the frame 6, it is necessary to reduce productivity and introduce expensive equipment due to many processes, resulting in high product prices. It had the subject that it will become a thing.

  SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and aims at weight reduction and resource saving, improving the productivity and lowering the price while improving the coupling strength and reliability between the speaker yoke and the frame. Is intended to provide.

  In order to solve the above problems, a speaker of the present invention is coupled to a frame, a magnetic circuit provided in the frame, a voice coil inserted into a magnetic gap of the magnetic circuit, an outer peripheral portion of the frame, and the voice coil. The magnetic circuit is composed of at least a magnet and a yoke, and is coupled to the magnetic circuit of the frame by elastically deforming the claw provided on the frame at the step provided on the yoke. It is configured to be fixed by being fitted while being engaged.

  With such a configuration, it is possible to provide a speaker capable of improving productivity and reducing the price while improving the coupling strength and reliability between the yoke and the frame.

  With the above-described configuration, the speaker of the present invention has a magnetic circuit including at least a magnet and a yoke, and the frame and the magnetic circuit of the frame are coupled to the step at the yoke. The claw is fixed by being fitted while being elastically deformed.

  With such a configuration, it is possible to provide a speaker capable of improving productivity and reducing the price while improving the coupling strength and reliability between the yoke and the frame.

  Therefore, the speaker according to the present invention can contribute to the global environment by reducing the weight and saving resources, and also has a great effect of being able to realize low price, high quality, and high reliability.

Sectional view of the speaker of the present invention The perspective view of the flame | frame of this invention Sectional drawing of the yoke in another embodiment of this invention Sectional drawing of the speaker in another embodiment of this invention External view of electronic device of the present invention Sectional view of the mobile device of the present invention Cross-sectional view of a conventional speaker Sectional drawing of the speaker in another conventional embodiment Plan view of conventional yoke Plan view of main parts of a conventional frame A plan view of a main part showing a coupling state between a conventional yoke and a frame.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
Hereinafter, the present invention will be described using the first embodiment.

  1 is a cross-sectional view of a speaker of the present invention, FIG. 2 is a perspective view of a frame of the present invention, FIG. 3 is a cross-sectional view of a yoke according to another embodiment of the present invention, and FIG. It is sectional drawing of the speaker in another embodiment of this.

  The speaker of the present invention will be described with reference to FIGS. 1, 2, 3 and 4.

  In the cross-sectional view of the tweeter shown in FIG. 1, the speaker of the present invention includes a frame 26, a magnetic circuit 24 provided in the frame 26, a voice coil 28 inserted in a magnetic gap 25 of the magnetic circuit 24, The diaphragm 27 is coupled to the outer peripheral portion 26 and the voice coil 28. The equalizer 30 covers the front surface of the diaphragm 27 and also serves as a protector.

  On the other hand, in the sectional view of the full range or woofer which is another speaker shown in FIG. 4, the frame 26, the magnetic circuit 24 provided in the frame 26, and the voice coil 28 inserted into the magnetic gap 25 of the magnetic circuit 24. And a damper 29 for holding the voice coil 28 at the center, a diaphragm 27 coupled to the outer periphery of the frame 26 and the voice coil 28, and a dust cap 31 provided on the front surface of the diaphragm 27. Has been.

  Here, if the magnetic circuit 24 is composed of at least the magnet 22 and the yoke 21, a magnetic gap can be formed, so that the function of the magnetic circuit is sufficient. The case where the plate 23 is provided on the opposite side will be described.

  The magnetic circuit 24 sandwiches the magnet 22 between the yoke 21 and the plate 23 to form an internal magnet type magnetic circuit, and constitutes a magnetic gap 25.

  A frame 26 made of resin is coupled to the yoke 21 of the magnetic circuit 24.

  Here, the coupling between the yoke 21 and the frame 26 is constituted by fixing the step 21a provided on the yoke 21 by fitting the claw 26a provided on the frame 26 while elastically deforming.

  With such a configuration, it is possible to provide a speaker capable of improving productivity and reducing the price while improving the coupling strength and reliability between the yoke 21 and the frame 26.

  Next, the configuration of the magnetic circuit 24 will be described.

  If the magnetic circuit 24 is composed of at least the magnet 22 and the yoke 21, a magnetic gap can be formed, which is sufficient as a function of the magnetic circuit.

  As described above, the magnetic circuit composed only of the magnet 22 and the yoke 21 is mainly used in the magnetic circuit of a small speaker for mobile use and the like, which is beneficial for reducing the number of components and reducing the weight. It is a simple structure, can improve productivity, and can also reduce the price.

  Further, in the case where the plate 23 is provided on the opposite side of the coupling portion of the magnet 22 with the yoke 21, the number of components increases, but the effect of providing the plate 23 allows the magnetic flux of the magnet 22 to be concentrated in the magnetic gap 25. As a result, the magnetic flux density can be improved and a good magnetic flux density distribution can be obtained.

  Therefore, since a high-performance speaker with high sound pressure and good linearity can be provided, the speaker is often used for audio visual applications such as automobile applications, minicomponents, and video equipment.

  As described above, the configuration of the magnetic circuit 24 can be properly used according to the usage and field of use. By doing so, the best effect can be exhibited in the usage and field of use. Can do.

  Next, a detailed configuration when the frame 26 is coupled to the yoke 21 of the magnetic circuit 24 will be described.

  The yoke 21 is made of a metal material such as iron. In the case of a yoke used for a small speaker, it is often obtained by drawing a sheet-like metal material, while the yoke used for a large speaker. In many cases, a final shape product is obtained by sequentially forming a lump of a metal material by press forming using a multi-stage former.

  In any case, the step 21a provided in the yoke 21 is set by forming a step shape in the die for press molding or the die for press molding at the time of drawing molding or press molding. The step 21a can be easily obtained without the need for an additional process.

  Here, by providing the step 21a on the outside of the side wall portion of the yoke 21, the step 21a can be obtained with good productivity and high accuracy at the time of drawing forming or press forming.

  Also, in the coupling with the frame 26, the claw 26a provided on the frame 26 is fixed by being fitted while being elastically deformed, so that it can be stably held with a simple fitting structure. As a result, the quality and reliability of the coupling can be improved.

  Further, since the step 21a is provided over the entire circumference of the side wall portion of the yoke 21, the step 21a can be combined without causing an angular directionality in relation to the claw 26a provided on the frame 26. Can be improved.

  At this time, if the thickness of the yoke 21 is thin and the step 21a is provided over the entire circumference of the side wall of the yoke 21, the cross-sectional area of the step portion of the yoke 21 is reduced, resulting in an increase in magnetic resistance. In such a case, the step 21 a may be partially provided without being provided over the entire circumference of the side wall of the yoke 21.

  In this case, providing the step 21a corresponding only to the fitting portion with the claw 26a provided on the frame 26 can minimize the location where the cross-sectional area of the step portion of the yoke 21 is reduced. In order to prevent a decrease in magnetic flux density, an optimum step structure is obtained.

  That is, when securing the minimum holding performance of the magnetic circuit 24 by the frame 26 is considered, the circular magnetic circuit 24 may have at least three claws 26a as fitting portions. As for the step on the side wall, only three points corresponding to the claw 26a are required.

  By adopting such a configuration, the number of places where the cross-sectional area of the stepped portion of the yoke 21 is reduced is reduced to only a minimum of three by providing three fitting portions with the claws 26a provided on the frame 26. Since it is not necessary to set a stepped portion where the cross-sectional area decreases at other locations, it is possible to prevent a decrease in magnetic flux density.

  Further, by providing three fitting portions, the resin material used for the claw 26a provided on the frame 26 is minimized, and the holding performance, quality and reliability of the magnetic circuit 24 by the frame 26 are improved. The function can be ensured, and the weight and price of the speaker can be reduced.

  Further, as shown in FIG. 3, the step 21b of the yoke 21 may be provided not only in one step but also in two steps. In such a configuration, a portion where the cross-sectional area of the yoke 21 is extremely reduced is provided. Since it can be generated in a distributed manner in two locations while avoiding being concentrated in one location, an increase in magnetic resistance can be suppressed and a decrease in magnetic flux density can be reduced.

  Furthermore, in this case, in terms of productivity, it is not necessary to concentrate a large step at one place, and it can be provided at two places so that it can be provided at the time of one draw forming process or press forming process. The step shape can be easily set without being influenced by the performance of the molding machine.

  And, if necessary, the step size at the second location is larger than the case where it is concentrated in one location when it is distributed in two locations compared to the case where it is concentrated in one location. Since it can be set large, the fitting dimension with the claw 26a provided on the frame 26 can be set large, so that the coupling quality and reliability can be further improved.

  As described above, the shape of the step 21a and the step 21b provided on the side wall of the yoke 21 can be appropriately and selectively set according to the material thickness of the yoke 21 to be used. Accordingly, it is possible to improve the balance of securing the productivity and magnetic flux density, and to obtain a speaker with high performance.

  The detailed contents of the step 21a and the step 21b provided on the side wall of the yoke 21 have been described above. Next, the detailed contents of the frame 26 and the claw 26a provided on the frame 26 will be described.

  The frame 26 of the present invention is formed of a resin, and this resin is often formed by injection molding. Therefore, the production efficiency is high and the price can be reduced.

  By forming the frame 26 from resin, the weight can be reduced due to the difference in specific gravity compared to a conventional frame made of metal such as iron.

  Further, in the production method, unlike the metal frame, there is no step of removing inner and outer diameters, window holes and the like, and material loss can be reduced, so that resource saving can be realized.

  Furthermore, compared to the conventional frame made of metal such as iron, it is possible to reduce the price by using an inexpensive resin material, which is produced by press molding and punching with a mold. There is also a merit that the degree of freedom in shape design is large compared to a frame made of metal such as iron.

  That is, by forming the frame 26 from a resin, it is possible to easily realize the material thickness of the frame 26 which is difficult to configure with a metal frame depending on the location, and more complicated shapes can be formed by injection molding. It can be easily realized depending on the situation.

  Since the frame 26 is integrally molded simultaneously with the claw 26a by injection molding, it is not necessary to provide a step for providing the claw 26a, and the productivity can be further improved.

  By adopting such a configuration, the frame 26 provided with the claw 26a can easily obtain good productivity and high dimensional accuracy by using the resin, and the productivity and quality can be improved and the price can be reduced. it can.

  Here, the claw 26a provided in the frame 26 is provided inside the fitting portion with the side wall portion of the yoke of the frame 26 as shown in FIG.

  As shown in FIG. 2, when using a frame having a circular planar shape and a circular magnetic circuit, the claws are provided at at least three locations of the fitting portion with the side wall portion of the yoke 21 of the frame 26, By minimizing the resin material used, it is possible to secure functions such as the holding performance, quality and reliability of the magnetic circuit by the frame, and it is possible to reduce the weight and the price of the speaker.

  On the other hand, when using a square or rectangular magnetic circuit with a planar shape that is not circular, the claws are provided at a total of four locations, one on each side of the fitting portion with the side wall of the yoke of the frame. By minimizing the resin material used, it is possible to secure the magnetic circuit holding performance by the frame, as well as functions such as quality and reliability, and to reduce the weight and price of the speaker. .

  As described above, the planar shape of the magnetic circuit may be any shape such as a circle, a square, a rectangle, an ellipse, or a track shape. Any structure can be used as long as it can be held, and it can be freely set in accordance with market requirements, functions such as quality and reliability can be secured, and the weight and price of the speaker can be reduced.

  Further, the claws may be provided over the entire circumference of the fitting portion with the side wall portion of the yoke 21 of the frame 26. With such a configuration, the resin material used tends to increase. The holding performance of the magnetic circuit can be significantly improved.

  Further, when the claw is provided over the entire circumference of the fitting portion with the side wall portion of the yoke 21 of the frame 26, the claw is placed on the circumference so as to be easily elastically deformed when fitted with the step of the yoke 21. Alternatively, one or several slits may be provided.

  Here, since the resin material used for the frame 26 is a material having high flexibility, the step provided on the yoke 21 of the magnetic circuit 24 by elastically deforming the claw 26 a provided on the frame 26. When fitted to 21a, the magnetic circuit 24 can be securely held with good productivity by the effect of the spring property.

  After the magnetic circuit 24 is held, the magnetic circuit 24 can be easily removed from the frame 26 by continuously applying elastic stress to the magnetic circuit by the claw 26a provided on the frame 26 due to the effect of the spring property. It will not come off.

  Further, as described above, the resin material used for the frame 26 may be formed by using a material having high flexibility and mixing a reinforcing filler.

  The reinforcing filler to be mixed here can improve the rigidity and heat resistance of the frame and further improve the dimensional accuracy by using a reinforcing filler having an effect of improving the rigidity such as glass and mica.

  Therefore, the claw 26a provided on the frame 26 that needs to be elastically deformed can also improve rigidity, heat resistance, and dimensional accuracy. Therefore, the quality and reliability of the speaker can be improved.

  On the other hand, when it is desired to improve toughness, toughness, weight reduction, impact resistance, and heat resistance can be improved by mixing bamboo fiber, bamboo charcoal, or cellulose fiber.

  Therefore, since the toughness, impact resistance and heat resistance of the claw 26a provided on the frame 26 which needs to be elastically deformed can be improved, the magnetic circuit 24 is stable against vibration and temperature change. As a result, the quality and reliability of the speaker can be improved.

  Further, since the internal loss of the frame 26 can be expanded, unnecessary resonance can be reduced and the frequency characteristics and sound quality of the speaker can be improved.

  As described above, the reinforcing filler is mixed with any one of glass, mica, bamboo fiber, bamboo charcoal, cellulosic fiber, or a combination thereof, whereby the strength, rigidity and reliability required for the frame 26, According to desired characteristics and sound quality required for the speaker, it is possible to selectively cope with mixing, and it is possible to satisfy the request more finely and to further improve the performance of the speaker.

  Furthermore, a positioning guide 26b for fixing the yoke 21 and the frame 26 at a predetermined position may be provided by integral molding when the frame 26 is integrally molded by injection molding simultaneously with the claw 26a.

  With such a configuration, during the production of the speaker, the guide effect of the positioning guide 26b improves the productivity when the frame 26 and the yoke 21 are fitted, and the frame 26 holds the magnetic circuit. The performance can be improved, and the price and quality and reliability of the speaker can be reduced.

  The detailed contents of the claw 26a provided on the frame 26 have been described above. However, when the frame 26 and the yoke 21 of the magnetic circuit 24 are fitted and coupled, an adhesive is bonded to the coupling portion between the frame 26 and the yoke 21. May be applied and combined.

  By adopting such a configuration, due to the effect of the adhesive, in addition to the coupling strength in the fitting between the step 21a of the yoke 21 and the tab 26a of the frame 26, the coupling strength by the adhesive is also added, thereby improving the coupling strength and abnormal noise. Further synergistic effects can be exerted on prevention.

  Further, the adhesive can be concentratedly applied also in the vicinity of the positioning guide 26b described above, so that the contact area between the frame 26 and the yoke 21 can be increased, and the coupling strength between the frame 26 and the yoke 21 can be further increased. Can be improved.

  Therefore, the holding performance of the magnetic circuit 24 can be greatly improved, and furthermore, abnormal noise or flickering noise caused by resonance that easily occurs between the frame 26 and the yoke 21 can be eliminated.

  Furthermore, by applying an adhesive, air leakage can be prevented, and abnormal sound such as distorted sound due to air leakage can be eliminated.

  For this reason, quality and reliability can be greatly improved, and it is extremely useful for a speaker for an automobile or the like that requires severe environmental resistance such as vibration and temperature change.

  As described above, in the speaker of the present invention, the frame 26 is coupled to the magnetic circuit 24 by fitting the step 26a provided on the yoke 21 while elastically deforming the tab 26a provided on the frame 26. With such a configuration, a speaker capable of improving productivity and reducing costs while improving the coupling strength and reliability between the yoke 21 and the frame 26 is achieved. Can be provided.

  Therefore, the speaker according to the present invention can contribute to the global environment by reducing the weight and saving resources, and at the same time exhibits the great effect of being able to realize low price, high quality and high reliability by improving productivity. can do.

(Embodiment 2)
Hereinafter, the present invention will be described using the second embodiment.

  FIG. 5 is an external view of an audio minicomponent system that is an electronic apparatus according to an embodiment of the present invention.

  As shown in FIG. 5, the speaker 32 of the present invention is incorporated in an enclosure 41 to constitute a speaker system, and an amplifier 42 which is an amplifying means for an electric signal supplied to the speaker 32, and is input to the amplifier 42. And an audio mini-component system 44 that is an electronic device.

  With this configuration, as described above, it is possible to realize an electronic device that can contribute to the global environment by reducing weight and saving resources.

  Therefore, it is possible to exert a great effect that the electronic device can be reduced in weight and resources, and can be realized with low cost, high quality, and high reliability by improving productivity.

(Embodiment 3)
Hereinafter, the present invention will be described using the third embodiment.

  FIG. 6 shows a cross-sectional view of an automobile 50 that is a mobile device according to an embodiment of the present invention.

  As shown in FIG. 6, at least a power generating means 45, a power transmitting means 46 for transmitting the generated power, a steering means 47, and a chassis 48 are provided, and the speaker 32 of the present invention is incorporated in a rear tray or a front panel. Thus, the automobile 50 is configured as a part of car navigation or car audio.

  Note that the mounting position of the speaker 32 to the automobile 50 is not limited to the rear tray or the front panel, and may be any position such as a door, a ceiling, a pillar portion, an instrument panel portion, or a floor.

  By adopting this configuration, as described above, it is possible to realize the weight reduction and resource saving of the speaker 32, thereby reducing the fuel consumption of the mobile device and contributing to the global environment. Can be realized.

  Furthermore, although the example which mounted the speaker of this invention in the motor vehicle was demonstrated, it is not limited to this, A motorbike, a bus | bath, a train, a ship, etc. can be mounted in anything, and it is the same. The effect can be demonstrated.

  Therefore, it is possible to exert a great effect that the mobile device can be reduced in weight, fuel consumption can be reduced, resource saving and cost reduction, high quality, and high reliability can be realized.

  The speaker according to the present invention can be applied to a speaker that needs to be reduced in weight and resources.

Reference Signs List 1 yoke 2 magnet 3 plate 4 magnetic circuit 5 magnetic gap 6 frame 7 diaphragm 8 voice coil 9 damper 10 equalizer 11 dust cap 21 yoke 21a step 21b step 22 magnet 23 plate 24 magnetic circuit 25 magnetic gap 26 frame 26a claw 27 vibration plate 28 Voice coil 29 Damper 30 Equalizer 31 Dust cap 32 Speaker 41 Enclosure 42 Amplifier 43 Player 44 Mini component system 45 Power generation means 46 Power transmission means 47 Steering means 48 Chassis 50 Automobile

Claims (16)

A speaker comprising a frame, a magnetic circuit provided in the frame, a voice coil inserted into a magnetic gap of the magnetic circuit, and an outer peripheral portion of the frame and a diaphragm coupled to the voice coil. In the speaker, the magnetic circuit is composed of at least a magnet and a yoke, and the frame is coupled to the magnetic circuit at a step provided in the yoke. Speaker fixed by fitting while elastically deforming. The speaker according to claim 1, wherein the magnetic circuit is provided with a plate on a side opposite to a coupling portion of the magnet with the yoke. The speaker according to claim 1, wherein the step is provided outside the side wall portion of the yoke. The speaker according to claim 3, wherein the step is provided over the entire circumference of the side wall of the yoke. The speaker according to claim 1, wherein the step is provided in two or more steps. The speaker according to claim 1, wherein the claw is provided inside a fitting portion with a side wall portion of the yoke of the frame. The speaker according to claim 6, wherein the claw is provided over the entire circumference of the fitting portion with the side wall portion of the yoke of the frame. The speaker according to claim 1, wherein the claws are provided at at least three positions of the fitting portion with the side wall portion of the yoke of the frame. The speaker according to claim 1, wherein the frame is made of resin. The speaker according to claim 9, wherein the frame is integrally formed with resin by a resin. The speaker according to claim 1, further comprising a positioning guide for fixing the yoke and the frame at a predetermined position. The speaker according to claim 9, wherein a reinforcing filler is mixed in the resin. The speaker according to claim 12, wherein the reinforcing filler is mixed with glass, mica, bamboo fiber, bamboo charcoal, cellulosic fiber, or a combination thereof. The speaker according to claim 1, wherein an adhesive is applied to a joint portion between the yoke and the frame. An electronic device comprising the speaker according to claim 1 and at least an amplifying means for supplying an electric signal to the speaker. A mobile device comprising the speaker according to claim 1, at least power generation means, power transmission means for transmitting generated power, steering means, and a chassis.

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