JPH06296300A - Speaker - Google Patents

Abstract

PURPOSE:To obtain a speaker in which no redundant wire cutting of a lead wire connected to a voice coil occurs when assembling is performed. CONSTITUTION:One terminal of the lead wire 18 cut in fixed length fitting in the size of the speaker to be used, etc., in advance is connected to a voice coil 17. The other terminal of the lead wire 18 is fitted in the magnetic gap of a magnetic circuit consisting of a bottom plate 9 in which a coil bobbin 16 connected to a terminal plate 20 is loaded on the magnetic circuit holding part 2 of a frame 3 made of plastic with bayonet coupling, a magnet 13, and a top plate 15. Thence, the terminal plate 20 is engaged with an engaging projection 3b provided at the frame 3, and the terminal plate 20 is fused with the engaging projection 3b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker used for various audio equipments, and more specifically, a speaker frame formed of heat-resistant plastic is used to assemble a magnetic circuit without using an adhesive. The present invention relates to a speaker that can be used.

[0002]

2. Description of the Related Art It is difficult to form a speaker frame from engineering plastics such as polycarbonate which has excellent heat resistance, mechanical strength, and abrasion resistance.
For example, JP-A-58-171197 and JP-B-63
-4999, and further JP-A-60-180300
It is already known in Japanese Patent Publications and the like. In particular, in the assembly structure of the speaker magnetic circuit disclosed in Japanese Utility Model Laid-Open No. 2-21998, the upper plate and the frame are placed on the upper surface of the plastic magnet with the joining projections inserted through the respective holes. By heating and fixing the lower plate and the bottom of the plastic frame, the magnetic circuit can be easily and easily attached to the speaker frame without using conventionally used assembling means such as an adhesive. On the other hand, a conventional speaker is manufactured by mounting a coil bobbin in a magnetic gap, cutting off an unnecessary portion of a lead wire whose one end is connected to a voice coil, and connecting the tip to a terminal board by an appropriate means such as welding. However, this method has a problem that a step of cutting the lead wire into a predetermined length is indispensable in the manufacturing process and the cut lead wire becomes an industrial waste. Therefore, the lead wire of the voice coil is preliminarily joined to the terminal plate without cutting the extra wire, and the length and shape of the lead wire are formed and fixed to the frame provided with the terminal mounting hole of the elongated hole while determining the position. A speaker is proposed in Japanese Patent Laid-Open No. 3-105480.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The invention disclosed in Japanese Patent Publication No. 98 is excellent in that a speaker having a plastic frame can be provided without using an adhesive, but the magnetic circuit for a speaker disclosed in this Publication is The assembly structure is
Engaging projections must be formed on a plurality of portions on the upper and lower surfaces of the ring-shaped plastic magnet, and engaging plates corresponding to the engaging projections must be provided in the plates arranged above and below the plastic magnet. Therefore, as the number of processing steps for the components that make up the magnetic circuit increases,
If an error occurs in the centering of the engaging projection or the hole, it becomes difficult to assemble the magnetic circuit. Also, while fixing by caulking or screws and adhesives are not necessary, heat fusion by high-frequency heating means is indispensable, so a large device is required in the manufacturing process, and the cost of the speaker is not necessarily reduced. There are many problems to be solved in practice, such as being unable to do so. Further, in the speaker proposed in Japanese Patent Laid-Open No. 3-105480, the terminal plate is positioned and fixed while caulking the frame, which complicates the manufacturing process and limits the holding of the forming shape only by the caulking position. There are many problems to be solved in practice.

In view of the above circumstances, it is an object of the present invention to provide a speaker which does not require an adhesive and can be assembled easily and easily.

[0005]

In order to achieve the above object, one speaker of the present invention is a voice coil in which one end of a lead wire cut in advance to a predetermined length according to the size of the speaker to be used is a voice coil. A coil bobbin connected to a terminal plate having an engaging hole at the other end is installed in the magnetic gap, and the engaging hole of the terminal plate is formed as an engaging protrusion integrally provided on a plastic frame. Engage,
It is characterized in that both are fused and fixed.

Another speaker of the present invention is a plastic frame in which a mounting portion for fixing the outer peripheral edge of the diaphragm and a mounting surface of the speaker are integrally formed above the bottomed cylindrical magnetic circuit holding portion. A bottom plate and a ring-shaped magnet are placed coaxially in the magnetic circuit holder, and a top plate is placed on the magnet, and a plurality of engaging portions projecting on the outer peripheral portion of the top plate. And a plurality of engaging pieces projectingly provided on the inner peripheral surface of the upper end of the magnetic circuit holding portion are bayonet-coupled to fix the magnetic circuit,
A voice coil has one end of a lead wire preliminarily cut into a certain length according to the size of a speaker to be used in the magnetic gap of the magnetic circuit, and a terminal plate having an engaging hole centered at the other end. It is characterized in that the connected coil bobbin is mounted, the terminal plate is engaged with an engaging projection provided on a plastic frame, and the terminal plate is fused and fixed to the engaging projection.

Furthermore, another speaker of the present invention is a plastic frame in which a mounting portion for fixing the outer peripheral edge of the diaphragm and a mounting surface of the speaker are integrally formed above the bottomed cylindrical magnetic circuit holding portion. A bottom plate and a ring-shaped magnet are placed coaxially in the magnetic circuit holder, and a top plate is placed on the magnet, and a plurality of engaging portions projecting on the outer peripheral portion of the top plate. The size of the speaker to be used in the magnetic gap of the magnetic circuit by bayonet coupling a plurality of engaging pieces protruding from the inner peripheral surface of the upper end of the magnetic circuit holding portion to fix the magnetic circuit. The lead wire, which was previously cut to a certain length according to the size, was attached to the voice coil at one end and the coil bobbin connected to the terminal plate at the other end, and the terminal plate was provided on the plastic frame. It is characterized in that it has engaging and holding the child plate holder.

In the speaker of the present invention, the coil bobbin to be used is such that a voice coil wound around the coil bobbin is connected to one end of a lead wire previously cut into a predetermined length, and the other end of the lead wire is connected to a terminal, respectively. It is fixed to the plate, and the length of the lead wire is defined by the diameter of the speaker to be manufactured and the amplitude of the diaphragm.

The frame constituting the speaker is integrally molded of engineering plastic having excellent heat resistance such as polyacetal, polyamide, polycarbonate, etc., and a bottomed cylindrical magnetic circuit portion is integrally formed. This magnetic circuit holding part is formed to be slightly deeper than the total thickness of the bottom plate, magnet and top plate to be used, and the inner diameter of the top plate when the top plate is fixed. It is set so as to have a desired distance from the outer peripheral edge. Further, on the inner peripheral surface of the upper end of the opening of the magnetic circuit holding portion, an engaging piece having an inclined surface inclined from the one end to the other end toward the bottom surface on the lower surface is provided so as to protrude in the axial direction. ,
A magnetic circuit is fixed in the cylindrical magnetic circuit holder by combining with an engaging part provided on the outer peripheral edge of the top plate by a bayonet method. It is provided on the inner peripheral surface having a height such that the magnetic circuit can be reliably fixed in the contact state with the upper surface of the engaging portion projecting on the peripheral edge.

[0010]

In the speaker of the present invention, the speaker is constructed by using the coil bobbin in which one end of the lead wire cut in advance to a predetermined length is connected to the voice coil and the other end is connected to the terminal board and the plastic frame. , The step of cutting unnecessary portions of the lead wire is not required when assembling the speaker, and the terminal plate is attached to the frame by a welding means or a simple means of engaging and holding the terminal plate holding portion provided on the frame. It can be carried out. Further, a plastic frame is used, and a bottom plate, a ring-shaped magnet and a top plate are sequentially mounted in a cylindrical magnetic circuit holding portion provided on the frame, and an engaging portion provided on the outer peripheral edge of the top plate. Is fixed to the engaging piece projecting from the inner peripheral surface of the opening of the magnetic circuit holder by bayonet coupling, so that a magnetic circuit can be constructed without using an adhesive.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the speaker of the present invention will be described below with reference to the accompanying drawings. A speaker 1 of the present invention includes a plastic frame 3 having a bottomed cylindrical magnetic circuit holder 2, a bottom plate 9 that is sequentially mounted and fixed in the magnetic circuit holder 2 of the frame 3, and A ring-shaped magnet 13 placed on the bottom plate 9,
Top plate 1 placed on the upper surface of the magnet 13
4 and a coil bobbin 16 in which a terminal plate 20 is connected to the voice coil 17 via a lead wire 18.

The frame 3 is provided with a mounting portion 4 for fixing the outer peripheral edge of the diaphragm 23 through a stepped portion that expands outwardly above the opening of the bottomed cylindrical magnetic circuit holder 2. A mounting surface 5 for mounting the speaker 1 on a vehicle door or the like is integrally provided, and the bottom surface 2 of the magnetic circuit holder 2 is provided.
An engaging projection 6 for positioning is provided so as to protrude from the central portion on a, and a back surface has an inclined surface 7 inclined from one side to the other in a bottom direction at a predetermined interval on the inner peripheral surface of the opening. A plurality of engaging pieces 8 are provided at a predetermined interval, and the entire frame 3 is integrally formed of a heat-resistant plastic material such as engineering plastic.

The bottom plate 9 is made of a magnetic material, and a cylindrical center pole 10 is integrally formed at the center of the upper surface of the bottom plate 9 and a magnet is formed so as to be concentric with the center pole 10. Guide 11 is provided,
An engaging recess 12 for engaging with an engaging projection 6 for positioning provided on the bottom surface 2a of the magnetic circuit holder 2 of the frame 3 is provided in the central portion of the back surface.

The ring-shaped magnet 13 has an inner peripheral portion in contact with the magnet guide 11 formed on the upper surface of the bottom plate 9, and an outer peripheral portion of the ring-shaped magnet 13 and the inner peripheral surface of the cylindrical magnetic circuit holding portion 2 are predetermined. It is a ferrite-based permanent magnet formed to have a size facing each other with an interval of.

The top plate 14 is made of a magnetic material, and in the embodiment, it is a disk-shaped member having a through hole for inserting the center pole 10 in its center portion, and is formed on the frame 3 on its outer peripheral edge. 3 to engage with the engaging piece 8
The one engaging portion 15 is integrally projected in the horizontal direction.
The engagement piece 8 formed on the frame 3 and the engagement portion 15 provided on the outer peripheral edge of the top plate 14 constitute a so-called bayonet mechanism. It should be noted that although a disk-shaped top plate is used in the embodiment, the whole top plate having a through hole for inserting the center pole in the center is formed into a square shape and each corner part is formed. Can also be used as the engaging portion.

As shown in FIG. 3, the coil bobbin 16 has a voice coil 17 wound around a lower outer peripheral portion of a heat-resistant plastic cylindrical body.
A terminal board 2 having one end of a lead wire 18 previously cut into a predetermined length connected to the other end and a terminal 19 at the other end.
It is connected to 0 and integrated. In the figure, 21
Is an engaging hole provided in the central portion of the terminal board 20.

The assembly of the speaker 1 using such constituent members will be described below with reference to FIG. First, on the bottom surface 2a of the cylindrical magnetic circuit holding portion 2 that constitutes the frame 3, the engagement recess 12 provided on the bottom surface of the bottom plate 9 and the engagement protrusion 6 of the frame 3 are engaged to achieve coaxiality. obtain. Then, the bottom plate 9 placed on the magnetic circuit holder 2
After the ring-shaped magnet 13 is mounted on the bottom plate 9 by using the magnet guide 11 of the above, the through hole of the top plate 14 is engaged along the center pole 10 to fit the top plate 14 in the magnetic circuit holding portion 2. Put on. At that time, the engaging portion 1 formed on the top plate 14
5 is mounted on the inner peripheral surface of the opening of the magnetic circuit holding portion 2 in a state where it does not come into contact with the engaging pieces 8 that are provided at a predetermined interval and project. Then, while pressing the top plate 14 downward. When rotated in a predetermined direction, the engagement portion 15 of the top plate 14 slides along the inclined surface 7 on the back surface of the engagement piece 8 formed on the magnetic circuit holding portion 2 by so-called bayonet coupling, and the movement thereof is prevented. If the top plate 14 is rotated to the extent that it cannot be used, the magnetic circuit composed of the bottom plate 9, the magnet 13 and the top plate 14 is fixed to the frame 3 without using an adhesive while absorbing the play of each component. be able to. Then, the coil bobbin 16 is fitted in the magnetic gap, and the coil bobbin 16 is held by the damper 22 and the vibrating plate 23, and then the terminal plate is attached to the engaging projection 3b vertically projecting on the horizontal step portion 3a of the frame 3. By engaging the engaging holes 21 of 20 from above and melting the engaging protrusions 3b protruding from the terminal plate 20, the terminal plate 20 is fused to the frame 3.

FIG. 2 shows an embodiment of another speaker 1a of the present invention, which is a coil bobbin 1
When the terminal plate 20 connected to the voice coil 17 of No. 6 through the lead wire 18 having a predetermined length is attached to the plastic frame 3, the terminal plate 20
And two engaging pieces 3c that are integrally provided on the frame 3 and project in parallel at an upper portion with a predetermined gap, and the engaging pieces 3c.
It is attached by being engaged and held by a terminal plate holding portion formed by one engaging piece 3d which is formed so as to protrude below the space between the terminal plate 20 and the thickness of the terminal plate 20. In the figure, the same reference numerals as those in FIG. 1 indicate the same members as the speaker 1.

[0019]

According to the speaker of the present invention, one end of the lead wire, which is cut in advance to a certain length according to the size of the speaker to be used, is connected to the voice coil and the other end is connected to the terminal board by a coil bobbin. It is mounted in the gap and can be fixed by fusing or engaging and holding the terminal plate with a plastic frame.There is no step of cutting the lead wire when manufacturing the speaker, Since the attachment to the frame can be performed by a very simple means such as fusion bonding or engagement holding, the efficiency of speaker production can be greatly improved.

Also, the frame is molded from plastic,
A bottom plate, a magnet, and a top plate are sequentially placed coaxially in a cylindrical magnetic circuit portion formed in the frame, and the engagement portion provided on the outer peripheral edge of the top plate and the opening portion of the magnetic circuit holding portion By fixing the magnetic circuit to the frame by combining the bayonet with the engaging piece provided on the peripheral surface, the magnetic circuit can be assembled without using an adhesive, and it can be adjusted according to the size of the speaker to be used. By using one end of the lead wire cut in advance to a voice coil and the coil bobbin connected to the terminal plate at the other end together, it is possible to produce a speaker more rationally I have.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a speaker of the present invention.

FIG. 2 is a vertical cross-sectional view showing another embodiment of the speaker of the present invention.

FIG. 3 is a partially cutaway side view of a voice coil used in the speaker of the present invention.

[Explanation of symbols]

 1 Speaker 2 Cylindrical Magnetic Circuit Holding Part 3 Frame 7 Sloping Surface 8 Engaging Piece 9 Bottom Plate 13 Magnet 14 Top Plate 15 Engaging Part 16 Coil Bobbin 17 Voice Coil 18 Lead Wire 20 Terminal Board

Claims (3)

[Claims] 1. A coil bobbin in which one end of a lead wire cut in advance to a predetermined length according to the size of a speaker to be used is connected to a voice coil and the other end is connected to a terminal plate having an engaging hole at the center. Is mounted in a magnetic gap, and the engaging hole of the terminal plate is engaged with an engaging protrusion integrally provided on a plastic frame to fuse and fix the both. 2. A bottom plate in a magnetic circuit holding portion of a plastic frame integrally formed with a mounting portion for fixing the outer peripheral edge of the diaphragm and a mounting surface of the speaker above the bottomed cylindrical magnetic circuit holding portion. And a ring-shaped magnet are placed coaxially with each other, a top plate is placed on the magnet, and a plurality of engaging portions projecting on an outer peripheral portion of the top plate and an upper end of the magnetic circuit holding portion are provided. A plurality of engaging pieces protruding from the inner peripheral surface of the part are bayonet-coupled to fix the magnetic circuit, and a fixed length is preset according to the size of the speaker to be used in the magnetic gap of the magnetic circuit. One end of the lead wire cut into a voice coil,
A coil bobbin connected to a terminal plate with an engaging hole centered on the other end is mounted, the terminal plate is engaged with an engaging protrusion provided on a plastic frame, and the terminal plate is fused and fixed to the engaging protrusion. A speaker characterized in that 3. A bottom plate is provided in a magnetic circuit holding portion of a plastic frame integrally formed with a mounting portion for fixing the outer peripheral edge of the diaphragm above the bottomed cylindrical magnetic circuit holding portion and a mounting surface of the speaker. And a ring-shaped magnet are placed coaxially with each other, a top plate is placed on the magnet, and a plurality of engaging portions projecting on an outer peripheral portion of the top plate and an upper end of the magnetic circuit holding portion are provided. A plurality of engaging pieces protruding from the inner peripheral surface of the part are bayonet-coupled to fix the magnetic circuit, and a fixed length is preset according to the size of the speaker to be used in the magnetic gap of the magnetic circuit. One end of the lead wire cut into a voice coil,
A speaker characterized in that a coil bobbin having the other end connected to a terminal plate is mounted and the terminal plate is engaged and held by a terminal plate holding portion provided on a plastic frame.