JPH04183199A - Speaker provided with rectangular york and its manufacture - Google Patents

Abstract

PURPOSE:To protect adherence of welding scale to a magnetic circuit of a speaker and to save electric power for mass production of the speaker by covering the main unit of yoke of section channel type with the top section open and the opening of the yoke with yoke, by integrating the main unit of yoke, and a yoke plate provided with caulking protrusions at its top without requiring any welding and using stacking method. CONSTITUTION:Yoke plate 27 that covers the opening of the top of main unit of yoke 22 of section channel type with the top open has square through holes 27a for forming a magnetic gap in the center section thereof, and is provided with a plurality of coaxially installed caulking protrusions 28 at the top surface for fixing frame 29. First, yoke plate 27 is fixed to frame 29 using caulking protrusions 28, main magnet 26 fixed to bottom yoke 25 is bonded to the back of yoke plate 27, a vibrating system is mounted, and first, an external magnet type speaker is completed, and then repulsion magnet 23 fixed to main unit of yoke 22 is attached to the back of bottom yoke 25.

Description

[Detailed Description of the Invention] [Industrial Application Field] The second invention relates to a speaker used in various sound devices, particularly a speaker having a repulsive magnetic circuit using a square yoke, and a method for manufacturing the same. be.

[Conventional technology]

A speaker 1 having a magnetic circuit using a rectangular yoke shown in FIG. A magnet 6 having a pole 5 in the center is provided,
The voice coil 3 is installed in the gap formed between the outer peripheral surface of the tip of the pole 5 and the inner peripheral surface of the yoke hole 3. A convex dowel is formed on the upper surface 4a of the yoke 4, and since this dowel can only be caulked to the frame 7, - for boat fishing, a welding dowel is formed on the bottom surface of the metal frame 7 as shown in Fig. 4. A dowel 7a is provided protruding from the frame 7 and a current is applied between the frame 7 and the square yoke 4 to melt the dowel 7a provided on the frame 7 and weld them together, as shown in FIG. With the frame 7 facing down, the pole 5 is placed inside the square yoke 4 that is welded to the frame 7, and then a magnet 6 coated with adhesive on both sides is attached to form a magnet 6 between the yoke hole 3 and the pole. After inserting a gap gauge (not shown) into the magnetic gear knob and turning the face-down frame 7 upward, set the dust ring 8 around the pole 5 from one side of the square yoke 4 that was released. Assemble the magnetic circuit.

In the figure, 9 is a diaphragm, 10 is a damper, 11 is a dust cap, and 12 is a gasket.

[Problems to be Solved by the Invention] The above-mentioned known speaker using a square yoke uses a method in which a current is passed between the frame and the square yoke to weld them together, so there is no possibility of melting during welding. Since welding scum is scattered in the direction of the yoke hole, it is an essential step to remove this welding scum with a wire brush or the like.

However, since the welding scum is iron, it easily adheres to poles and magnets, and when the magnet is magnetized, it is attracted to the magnetic gap of the magnetic circuit where the magnetic flux density is highest and enters, causing the speaker to sound. The welding residue rubs against the voice coil and causes noise, so removing welding residue with a wire brush must be done extremely carefully.Moreover, the square yoke used is
Since a rectangular plate member is bent to form a rectangular tube, it requires skilled techniques and time to incorporate components such as magnets, poles, and even dust rings into the rectangular yoke, making mass production impossible. It has become a bottleneck.

In view of the current situation, the present invention has developed a speaker using a rectangular yoke that is extremely easy to assemble, eliminates welding residue from adhering to the magnetic circuit, and saves labor for mass production. The purpose of this invention is to provide a method for producing the same.

[Means to solve the problem]

A speaker having a rectangular yoke, which is a first aspect of the present invention, has a yoke body having a channel-shaped cross section with an open upper surface, and a yoke plate that covers the opening of the yoke body and has a caulking protrusion. A bottom yoke having a pole is interposed between the yoke body and the yoke plate, and a ring-shaped main magnet and a pulsion magnet are attached so that the polarities of opposing surfaces repel each other. a repulsion type magnetic circuit is formed, and a through hole for engagement provided in the frame is engaged with a caulking protrusion of the yoke plate of the repulsion type magnetic circuit, and the frame and the yoke plate are integrated by caulking the caulking protrusion. It is characterized by a combination of

A method for manufacturing a speaker having a square yoke according to a second invention includes a yoke body having a channel-shaped cross section with an open top surface;
forming a square yoke with a yoke plate that covers the opening of the yoke body and has a crimping protrusion, and engaging a through hole for engagement provided on the bottom surface of the frame with the crimping protrusion of the yoke plate; A process of caulking the caulking protrusion to integrally connect the yoke plate and the frame, a process of fixing a ring-shaped main magnet to the bottom yoke having a pole, and a process of attaching the bottom yoke to the back side of the yoke plate integrated with the frame. After fixing the top surface of the main magnet integrated with the yoke, the voice coil, damper, and diaphragm are installed inside the frame and magnetized to produce an external magnet type speaker. fixing a repulsion magnet, and attaching the bottom surface of the bottom yoke of the external magnetic speaker to the top surface of the repulsion magnet, which is magnetized to have a polarity opposite to the polarity of the main magnet in the external magnetic speaker. This method is characterized by a step of fixing.

[Function] A speaker using the rectangular yoke of the present invention includes a yoke constituting a magnetic circuit, a yoke body having a channel-shaped cross section with an open top surface, and a yoke body that covers the opening of the yoke body and has a swage mechanism for caulking. Since it is composed of a yoke plate with protrusions on the top surface, the yoke plate and frame can be crimped using the crimping protrusions provided on the yoke plate, which stabilizes the mounting strength and prevents iron powder generated during welding. No problems arise at all.

On the other hand, a method of manufacturing a speaker using a square yoke consists of a yoke that constitutes a magnetic circuit, a yoke body that has a chaffle-shaped cross section with an opening at the top, and a yoke body that covers the opening of the yoke body and is used for caulking. It consists of a yoke plate with protrusions on the top, and the frame is fixed to the yoke plate by caulking.Then, the main magnet fixed to the bottom yoke is attached to the back of the yoke plate, the vibration system is attached to the frame, and the frame is removed. After manufacturing a magnetic type speaker, a repulsion magnet fixed to the yoke body is attached to the back of the bottom yoke of the resulting external magnetic type speaker, so no welding is required during speaker manufacture, and each process is separated. Since the products obtained in each process are finally integrated using a stacking method, it is possible to save labor in speaker manufacturing.

[Example] Hereinafter, an example of a speaker using a square yoke of the present invention will be described based on the attached drawings.

As shown in the first part, the magnetic circuit 21 of the speaker 20 using the square yoke of the present invention is attached to a yoke body 22 having a channel-shaped cross section with an open upper surface, and to the center of the bottom surface 22a of the yoke body 22. A bottom yoke 25 having a ring-shaped repulsion magnet 23, a pole 24 provided on the repulsion magnet 23, and a ring-shaped main part surrounding the pole 24 and provided on the bottom yoke 25. magnet 26 and the yoke main body 2
This is a repulsion type magnetic circuit composed of a yoke plate 27 that covers an opening on the upper surface of the magnetic head 2.

As is clear from FIG. 2, the yoke main body 22 has a protrusion 22b at the center of the bottom surface 22a, which has an outer diameter slightly smaller than the inner diameter of the repulsion magnet 22 to be used.
is integrally provided and serves as a mark for positioning the repulsion magnet 23.

This repulsion magnet 23 and main magnet 2
6 and the yoke portion 25a of the bottom yoke 25 have the same diameter, and on the upper surface of the yoke portion 25a of the bottom yoke 25, the inner diameter of the main magnet 26 which is used to surround the pole 24 is equal to the diameter. Projection 25b having an outer diameter
is integrally provided and serves as a positioning mark when attaching the main magnet 26.

Yoke plate 2 that covers the opening on the top surface of the yoke body 22
7 has a rectangular shape and has a through hole 27a in the center for forming a magnetic gearing, and a plurality of caulking protrusions for fixing the frame 29 are arranged concentrically on the upper surface.

The following method is used to assemble a speaker using such a repulsion type magnetic circuit.

First, the caulking protrusion 28 integrally provided on the upper surface of the yoke plate 27 is engaged with the engagement through hole 29a provided on the bottom surface of the frame 29 and fixed, and then the caulking protrusion 28 is fixed by an appropriate means. Caulk the yoke plate 27 with
and the frame 29 are integrated.

Next, after applying adhesive to the upper surface of the yoke 25a of the bottom yoke 25, the bottom surface of the ring-shaped main magnet 26 is brought into contact with the adhesive surface to fix them together, and the upper surface of the main magnet 26 is fixed. Frame 2 obtained in the above process
The voice coil 30 is attached to the back side of the yoke plate 27 which is integrated with the frame 29 with adhesive.
, a damper 31, and a diaphragm 32 are attached, and then magnetized to complete an external magnet type speaker.

On the other hand, a ring-shaped repulsion magnet 23 is fixed to the center of the bottom surface 22a of the yoke body 22 with adhesive,
After magnetizing the revision magnet 23 so that its polarity is opposite to the polarity of the main magnet 26 of the external magnet type speaker completed in advance as shown in FIG. 2,
Bottom yoke 25 on the top surface of revision magnet 23
The bottom surface of the yoke portion 25a is adhered with an adhesive to form a speaker 20 having a repulsion type magnetic circuit.

In addition, in FIG. 2, 33 indicates a dust cap, and 34 indicates a gasket.

〔Effect of the invention〕

A speaker having a square yoke according to the second invention includes a yoke body having a challe-shaped cross section with an open top portion of the square yoke;
Since the yoke plate covers the opening and has a crimping protrusion, the yoke plate and the frame can be crimped by the crimping protrusion provided on the yoke plate, increasing the mounting strength of both. It is stable and has no malfunctions such as noise caused by iron powder compared to conventional integration by welding, and the shape of the yoke is better than a square yoke with a cylindrical cross-section made by winding and welding iron plates. It has the advantages of being extremely simple, mass-produced at low cost, and reducing manufacturing costs as parts.

On the other hand, a method for manufacturing a speaker having a square yoke is to construct a square yoke with a yoke main body having a channel-shaped cross section with an opening at the top, and a yoke plate that covers the opening and has a caulking protrusion. The frame is crimped by the crimping protrusion provided on the yoke plate, and the main magnet, bottom yoke, and main body and pulsion magnet 7 that make up the magnetic circuit are integrated in separate processes, and integrated with the frame. After attaching the main magnet nodule integrated with the bottom yoke to the main magnet that has been converted into an outer magnetic type speaker, a yoke body with a revitalized magnet nozzle is attached to the obtained outer magnetic type speaker to create the final product. Since the speaker has a repulsive square yoke, there is no process to remove welding residue attached to the magnet as in the past, and the speaker is manufactured using a stacking method, which greatly reduces labor in the speaker assembly process. It has many practical advantages, such as being able to mass-produce speakers with improved and stable quality.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a magnetic circuit constituting a speaker having a square yoke according to the present invention, FIG. 2 is a sectional view showing an embodiment of the speaker having a square yoke according to the present invention, and FIG. 3 is a conventional FIG. 4 is a cross-sectional view of a speaker having a square yoke, FIG. 4 is a cross-sectional view showing the relationship between the frame and the square yoke, and Part 5 is an exploded perspective view for explaining the assembled state of the magnetic circuit. 20...Speaker 21...Repulsion type magnetic circuit 22...Yoke body 23...Repulsion magnet 24...Pole 25...Bottom yoke 26...Main magnet 27...Yoke Plate 28...Protrusion for caulking 29...Frame

Claims (1)

[Claims] 1) A yoke body having a channel-shaped cross section with an open top surface;
A square yoke is formed by a yoke plate that covers the opening of the yoke body and has a caulking protrusion, and a ring-shaped main body is formed by interposing a bottom yoke having a pole between the yoke body and the yoke plate. A repulsion type magnetic circuit is constructed by attaching a magnet and a repulsion magnet so that the polarities of opposing surfaces repel each other,
The crimping projection of the yoke plate of the repulsive magnetic circuit is engaged with an engagement through hole provided in the frame, and the crimping projection is crimped to integrally connect the frame and the yoke plate. A speaker with a square yoke. 2) A yoke body with a channel-shaped cross section with an open top surface;
forming a square yoke with a yoke plate that covers the opening of the yoke body and has a crimping protrusion, and engaging a through hole for engagement provided on the bottom surface of the frame with the crimping protrusion of the yoke plate; A process of caulking the caulking protrusion to integrally connect the yoke plate and the frame, a process of fixing a ring-shaped main magnet to the bottom yoke having a pole, and a process of attaching the bottom yoke to the back side of the yoke plate integrated with the frame. After fixing the top surface of the main magnet integrated with the yoke, the voice coil, damper, and diaphragm are installed inside the frame and magnetized to produce an external magnet type speaker. fixing a repulsion magnet, and attaching the bottom surface of the bottom yoke of the external magnetic speaker to the top surface of the repulsion magnet, which is magnetized to have a polarity opposite to the polarity of the main magnet in the external magnetic speaker. A method of manufacturing a speaker having a square yoke, which comprises a fixing process.