JP3427263B2 - Loudspeaker and manufacturing method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker used in various audio equipments, in particular, a magnetic circuit can be easily assembled and disassembled, the reuse of magnetic circuit components can be promoted, and a magnetic flux The present invention relates to a speaker that can be optimally designed to reduce loss and a manufacturing method thereof.

[0002]

2. Description of the Related Art Generally, the magnetic circuit of an outer magnet type speaker is
An inner peripheral surface of the top plate, which comprises a bottom plate having a center pole at the center of the top surface, a ring-shaped magnet mounted on the bottom plate, and a top plate provided on the top surface of the magnet. A magnetic gap is formed between the center pole and the outer peripheral surface of the center pole. When forming the magnetic gap, a gap gauge made of a material such as Duracon is used, and a top plate, a magnet and a bottom plate are formed. Acrylic adhesive is used to fix the magnetic circuit.

On the other hand, in Japanese Utility Model Laid-Open No. 2-21998, a plastic magnet is mounted on the upper surface of the lower plate, and a bonding projection provided on the back surface thereof is inserted through a hole provided in the lower plate and mounted. The upper plate and the frame are placed on the upper surface of the plastic magnet, the joining projections protruding from the upper surface of the plastic magnet are sequentially placed in the respective holes (the holes formed in the upper plate and the frame), and then heated, A structure for assembling a magnetic circuit for a speaker, characterized in that a lower plate, a plate magnet, and an upper plate are thermocompression-bonded, and a protrusion of a joining projection provided on an upper surface of the plastic magnet is deformed and enlarged and fixed to a frame bottom. Is disclosed.

[0004]

SUMMARY OF THE INVENTION In the magnetic circuit of a general external magnet type speaker, the means for using an adhesive for assembling it requires ten or more minutes for the adhesive to cure, as described above. The lead time cannot be compressed, and the step of removing the gap gauge is required after the adhesive has hardened, but since the gap gauge is used repeatedly, an appropriate gap is formed due to wear or adhesion of adhesive. As the adhesion becomes stronger, it takes more time to dismantle the magnetic circuit, and in some cases the parts that make up the magnetic circuit may be damaged and cannot be reused. No reuse or separate disposal of components.

On the other hand, in the speaker magnetic circuit described in the above publication, the mutual positional relationship among the upper plate, the lower plate, the plastic magnet, and the frame is unique due to the fitting of the joining projection and the hole provided in the plate or the like. However, there is no eccentricity between parts due to misalignment in the assembly process and no adhesive is used, which has the advantage of facilitating the assembly of the magnetic circuit. Since the protrusions are formed, there is a problem in storage and transportation of plastic magnets as parts.

Further, when assembling the magnetic circuit, the upper plate and the lower plate are once thermocompression-bonded to the upper and lower surfaces of the plastic magnet by means of high-frequency dielectric heating, and then the frame and the plastic magnet are engaged. The assembly process itself is not always advantageous because it is necessary to connect the protrusions by appropriate means, and the thermocompression-bonded upper plate, lower plate and plastic magnet are integrated, so separate them for reuse. However, the plastic magnet material cannot obtain sufficient strength required for the magnetic circuit, and there is a problem in reliability.

On the other hand, in the outer magnet type speaker, since the inner diameter and outer diameter of the magnet used are standardized by EIAJ (Japan Electronic Machinery Manufacturers Association), the outer circumference of the center pole of the bottom plate of the magnetic circuit, It is not possible to optimize the loss of magnetic flux caused by the gap formed between the inner circumference of the magnet and the inner circumference.

In other words, in the conventional outer magnet type speaker, the inner diameter of the magnet is set in proportion to the outer diameter.
In order to increase the magnetic flux density, it is necessary to increase the outer diameter of the magnet, but of course the inner diameter also increases accordingly, so the contradiction that the loss of the magnetic flux due to the gap increases cannot be resolved.

In view of such problems, the present invention makes it possible to extremely easily assemble a magnetic circuit without using a gap gauge when manufacturing a speaker, and to disassemble the magnetic circuit if necessary. It is an object of the present invention to provide a speaker in which circuit components can be reused and / or sorted and discarded, and a manufacturing method thereof.

Another object of the present invention is to provide a high-quality speaker having a high magnetic flux density without changing the size of the magnet, and a manufacturing method thereof.

[0011]

In order to achieve the above object, the invention according to claim 1 of the present invention is a bottom plate having an engaging portion formed along the outer periphery of the base end portion of a center pole, The bottom portion is in close contact with the engaging portion, and is formed of a cylindrical cylindrical body capable of forming a required gap between the inner peripheral surface and the outer peripheral surface of the center pole, and the distal end portion of the cylindrical body. A plurality of guide pins having the same height as the thickness of the top plate are formed to project at a required interval in
A guide ring provided with a projection of a required length at the tip of each guide pin, a ring-shaped magnet positioned on the outer circumference of the guide ring, and a through hole corresponding to each guide pin near its inner peripheral edge. And a top plate having a plurality of positioning protrusions formed on the upper surface thereof so as to project concentrically with the required spacing, and in the vicinity of the inner peripheral edge of the inner bottom portion thereof, the plurality of protrusions corresponding to the guide ring are provided. , A frame having a through hole capable of receiving the same and a frame having a through hole capable of receiving the through hole corresponding to the positioning protrusion of the top plate at the center thereof. It is a speaker.

According to a sixth aspect of the present invention, a cylindrical guide ring capable of forming a required gap with the outer peripheral surface of the center pole is closely engaged on the bottom plate on the outer periphery of the center pole. The guide ring is centered, and a ring-shaped magnet is arranged on the outer side of the guide ring. A plurality of guide pins protruding from the upper surface of the guide ring are formed in a ring-shaped top corresponding to the guide pins. Insert each into the guide hole of the plate and fix the top plate on the magnet to define the positional relationship between the outer circumference of the center pole and the inner circumference of the top plate to form a magnetic gap. , Inserted into the through hole formed in the inner bottom of the frame corresponding to the positioning protrusion, and the position of the inner diameter of the magnetic gap and the inner bottom of the frame. A magnetic circuit defining a relationship,
Then, the protrusion provided on the tip of each of the guide pins is inserted into a through hole formed in the frame inner bottom corresponding to the protrusion, and the tip of the protrusion protruding to the frame inner bottom is crushed,
A method of manufacturing a speaker, characterized in that a frame and the magnetic circuit are integrated.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a speaker and a manufacturing method thereof according to the present invention will be specifically described below with reference to the accompanying drawings.

The speaker 1 of the present invention, as shown in FIG. 1, has a bottom plate 2 having a center pole 21 in the center thereof, and a cylindrical guide ring arranged on the bottom plate 2 on the outer periphery of the center pole 21. 3 and a ring-shaped magnet 4 provided outside the guide ring 3.
And an outer magnet type magnetic circuit 6 including a top plate 5 placed on the upper surface of the magnet 4, and the magnetic circuit 6
Is composed of a frame 7 to which is mounted, a voice coil 8 arranged in the magnetic gap of the magnetic circuit 6, and a diaphragm 9. In the figure, 10 is a damper and 11 is a dustproof cap. .

The bottom plate 2 has a concave engaging portion 22 formed along the outer periphery of the base end portion of a center pole 21 provided vertically in the central portion of the upper surface, and the cylindrical portion is formed in the engaging portion 22. By fitting the base end portion of the guide ring 3 into close contact with and holding the guide ring 3, the required space X is formed between the inner peripheral surface of the guide ring 3 and the outer peripheral surface of the center pole 21.

As is apparent from FIG. 3, the tubular guide ring 3 has the center pole on the inner peripheral surface of the base end portion of a short cylindrical body 31 having an inner diameter larger than the outer diameter of the center pole 21. While contacting the outer peripheral surface of the base end of 21,
A plurality of guide pins 33, 33 having a bottom surface portion 32 that closely engages with the inside of the engagement portion 22 and having a height substantially equal to the thickness of the top plate 5 to be used on the upper surface of the tip portion.
... are formed so as to project at a required interval, and projections 34 each having a height higher than the thickness of the inner bottom portion 7a of the frame 7 are provided on the upper end surface of each guide pin 33. It is integrally molded with a mold such as plastic.

As a material for forming the guide ring 3 having such a structure, either plastic or non-magnetic metal such as aluminum can be used, but a material magnetized with a plastic magnet capable of injection molding is used. By doing so, it is possible to form a guide ring having a complicated shape without changing the size of the ring-shaped magnet 4, and by selecting the thickness of the guide ring appropriately,
The gap between the outer peripheral surface of the center pole and the inner diameter of the magnet is filled with a magnetic material up to the limit position, so that a speaker with high magnetic flux density and good quality can be provided.

The ring-shaped magnet 4 has an inner diameter substantially equal to the outer diameter of the guide ring 3, and the outer diameter of the guide ring 3 arranged on the bottom plate 2 makes it easy to center the magnet 4. Can be done. The height of the magnet 4 is set so that the top of the guide ring 3 provided on the bottom plate 2 is flush with the height of the guide ring 3. The thickness of the body 31) is set.

The top plate 5 is composed of a ring body having a required diameter and thickness, and receives the guide pin 33 formed at the tip of the guide ring 3 along the inner peripheral edge side. A plurality of through holes 51 are formed corresponding to the guide pins 33, and a plurality of positioning protrusions 52 having a height higher than the thickness of the inner bottom portion 7a of the frame 7 are concentrically formed in the central portion of the upper surface. It is arranged.

The frame 7 corresponds to the protrusion 34 formed on the guide ring 3 along the vicinity of the inner peripheral edge of the inner bottom portion 7a, and the tip end of the protrusion 34 is formed on the inner bottom portion 7a.
A through hole (reference numeral is omitted) for projecting above a is formed, and the central portion thereof corresponds to the positioning projection 52 formed on the top plate 5.
A through hole (reference numeral is omitted) for projecting 2 on the inner bottom portion 7a is formed on a concentric circle.

In order to assemble the speaker 1 using the member having such a structure, the guide ring 3 is dropped along the center pole 21 of the bottom plate 2 and the bottom portion 32 of the guide ring 3 is placed on the bottom plate 2. After being held in close contact with the formed concave engaging portion 22, the magnet 4 is placed on the bottom plate 2 using the outer peripheral surface of the guide ring 3 as a guide.

Next, the guide pins 33 provided so as to project from the guide ring 3 closely held on the bottom plate 2,
.. are inserted into the through holes 51, 51 ... Formed in the top plate 5 corresponding to the guide pins 33, respectively, and the outer peripheral surface of the center pole 21 of the bottom plate 2 and the top plate The magnetic circuit 6 is formed by defining the positional relationship with the inner peripheral surface of 5 to form a magnetic gap (reference numeral is omitted).

At this time, the projections 34 formed at the tip of each guide pin 33 are in a state of protruding from the upper surface of the top plate 5.

The frame 7 is attached to the magnetic circuit 6 by
First, the positioning protrusion 52 arranged in the central portion of the upper surface of the top plate 5 is inserted into the through hole formed in the inner bottom portion 7a of the frame 7 corresponding to the positioning protrusion 52, and the magnetic gap portion and the inner diameter of the frame 7 are inserted. And the top plate 5 and the bottom plate 2 are fixed by the magnetic force of the magnet 4 without using an adhesive. At that time, the protrusion 34 formed on the guide ring 3 protruding from the upper surface of the top plate 5 also engages with the through hole arranged in the vicinity of the inner peripheral edge of the inner bottom portion 7a of the frame 7, and the tip portion thereof has the inner bottom portion 7a. Protruding above.

Through the above steps, the frame 7 mounted on the magnetic circuit 6 and the magnetic circuit 6 are fixed to each other by fixing the inner bottom portion 7a thereof.
This is performed by crushing the protrusion 34 of the guide ring 3 protruding upward by an appropriate means depending on the material of the guide ring used.

A concrete means for integrally mounting the magnetic circuit 6 and the frame 7 by crushing the projection 34 formed on the guide ring 3 is to select it appropriately according to the material forming the guide ring 3, and to use plastic. In the case of using, the heat welding or the heat welding is performed by an ultrasonic welder, the tip portions of the protrusions 34 are melted, the shape thereof is adjusted, and if it is a metal, it is performed by mechanical caulking.

In the speaker 1 thus formed, the magnetic circuit assembling process, the adhesive drying time, and the magnetic circuit assembling facility during manufacturing can be greatly reduced, and the magnetic circuit can be easily disassembled by demagnetizing the magnet. This makes it possible to reuse and separate and dispose of magnetic circuit components, which was previously impossible.

In order to disassemble the magnetic circuit 6, as shown in FIG. 4, when the magnet 4 is demagnetized, the bottom plate 2 and the magnet 4 which are coupled by the magnetic force of the magnet 4 can be easily removed from the speaker 1. Since the bottom plate 2 and the magnet 4 are removed, the guide ring 3 can be hit with a hammer or the like for easy disassembly.

[0029]

The speaker and the manufacturing method thereof according to the present invention are
On the bottom plate on the outer circumference of the center pole, the center of the magnet can be easily centered by the outer circumference of a cylindrical guide ring that is arranged so that there is a required gap between the inner circumference and the outer circumference of the center pole. By inserting the guide pin protruding from the tip of the into the through hole formed in the vicinity of the inner peripheral edge of the top plate, the positional relationship between the outer periphery of the center pole and the inner periphery of the top plate is determined to form a magnetic gap. However, since the state can be maintained, the magnetic circuit can be assembled without using a gap gauge.

Further, by inserting the positioning protrusions formed on the upper surface of the top plate into the through holes formed in the inner bottom portion of the frame corresponding to the positioning protrusions, the positional relationship between the magnetic gap and the frame inner diameter can be defined. By sandwiching the top plate between the guide ring and the frame, the positional relationship can be held and fixed, and at the same time, the positional relationship of the magnetic gap is completely fixed by the guide ring and the magnetic force of the magnet can be used. The top plate and the bottom plate can be fixed without using an adhesive.

Further, a projection provided on the tip of the guide pin of the guide ring is inserted into a through hole in the inner bottom portion of the frame formed corresponding to this projection, and the tip portion of the projection protruding above the inner bottom portion is crushed. The magnetic circuit can be easily and easily fixed to the frame, the assembly process of the magnetic circuit in manufacturing can be simplified, and the equipment required for assembly can be significantly reduced. Since the magnetic circuit can be easily disassembled by simply removing the magnet from the speaker and hitting the guide ring with an appropriate means, it is possible to reuse the magnetic circuit components or separate and discard them.

Furthermore, in the present invention, in the above-mentioned magnetic circuit configuration, the guide ring is made of a plastic magnet which can be injection-molded, and by magnetizing the plastic magnet, the outer circumference of the center pole is Since the gap formed between the inner surface of the magnet and the magnet can be filled to the limit with magnetic material, the quality of high magnetic flux density can be improved without changing the size of the magnet used in the outer magnet type magnetic circuit. This is a great practical advantage such as providing a good speaker.

[Brief description of drawings]

FIG. 1 is a half sectional view showing a preferred embodiment of a speaker of the present invention.

FIG. 2 is an exploded perspective view of a magnetic circuit of the speaker.

FIG. 3 is a partially cutaway front view of a guide ring in the speaker.

FIG. 4 is an explanatory diagram showing an example of a method of disassembling a magnetic circuit of the speaker.

[Explanation of symbols]

1 speaker 2 bottom plate 21 Center pole 3 Ring-shaped guide ring 33 guide pin 34 Protrusion 4 ring-shaped magnet 5 Top plate 51 Through hole on top plate 52 Positioning protrusion 6 magnetic circuit 7 frames 7a Inner bottom of frame 8 voice coils 9 diaphragm 10 damper 11 Dustproof cap

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04R 9/02 102 H04R 9/02 101 H04R 31/00

Claims (7)

(57) [Claims] 1. A bottom plate having an engaging portion formed along an outer periphery of a base end portion of a center pole, and a bottom portion closely engaging with the engaging portion, and an inner peripheral surface thereof and an outer peripheral surface of the center pole. A plurality of guide pins that have the same height as the thickness of the top plate and that have a required spacing at the tip of the cylindrical body and that form a required spacing between them. A guide ring having a projection of a required length provided at the tip of each guide pin, and a ring-shaped magnet positioned on the outer circumference of the guide ring, and each guide pin near the inner peripheral edge of the guide ring. In addition to forming corresponding through-holes, a top plate having a plurality of positioning protrusions projecting concentrically on the upper surface portion with a required space, and a plurality of guide rings of the guide ring near the inner peripheral edge of the inner bottom portion thereof. Correspondence with protrusion , And a frame having a through hole capable of receiving the same and having a through hole capable of receiving the through hole corresponding to the positioning protrusion of the top plate at the center thereof. Speaker. 2. The bottom plate according to claim 1, wherein the bottom plate has a concave engaging portion on the outer peripheral portion of the base end of the center pole, which is capable of receiving a part of the base end portion of the guide ring. The described speaker. 3. The speaker according to claim 1, wherein the guide ring is made of plastic or non-magnetic metal. 4. The tubular guide ring is composed of a cylindrical body having a required thickness as a whole, and a part of a base end portion of the guide ring contacts an outer peripheral surface of a base end portion of the center pole. A certain distance is formed between the outer periphery of the center pole and the center pole, and there are multiple guide pins on the upper surface that engage with the through holes formed in the top plate at the required distance. The speaker according to claim 1 or 3, wherein a projection for inserting and projecting into a through hole formed in the inner bottom portion of the frame is integrally formed at the tip of the speaker. 5. The speaker according to claim 1, wherein the guide ring is magnetized with a plastic magnet capable of injection molding. 6. A cylindrical guide ring capable of forming a required gap with the outer peripheral surface of the center pole is closely engaged on the bottom plate on the outer periphery of the center pole, and the guide ring is centered. After arranging a ring-shaped magnet on the outer side of the magnet, a plurality of guide pins protruding from the upper surface of the guide ring are respectively inserted into the guide holes of the ring-shaped top plate formed corresponding to the guide pins, and the magnet is inserted. The top plate is fixed on the top of the center pole to define the positional relationship between the outer circumference of the center pole and the inner circumference of the top plate to form a magnetic gap. The magnetic circuit is constructed by inserting it into the through hole formed at the bottom and defining the positional relationship between the magnetic gap and the inner diameter of the bottom inside the frame. Then, the projections provided on the tip end portions of the guide pins are inserted into the through holes formed on the inner bottom portion of the frame corresponding to the projections, and the tip end portions of the projections protruding on the inner bottom portion of the frame are crushed,
A method for manufacturing a speaker, characterized in that a frame and the magnetic circuit are integrated. 7. The method of manufacturing a speaker according to claim 6, wherein the crushing of the tip end portion of the protrusion is mechanical caulking or heat welding or fusion.