JPH09149493A - Cone-shaped speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker of high reliability and excellent performance by forming the summit part of a diaphragm and an engaging mechanism of the summit part of the diaphragm at the upper outside of the bobbin of a voice coil 12 to help the fixing force of adhesive and to facilitate assembling. SOLUTION: This speaker forms a circular projection part 1a at the inner peripheral surface of the summit part of the diaphragm 1 of an oscillation system A and a pair of tongue louvered pieces 2b and 2c warped downward and upward from the side face of a spool 2a to the plural places of a connection part with the diaphragm 1 of the spool 2a of a voice coil. Then the cone-shaped diaphragm 1 and the voice coil are stick-combined in the state of holding and inserting a circular projection part 1a between the pair of tongue louvered pieces 2b and 2c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combined structure of a diaphragm and a voice coil of a cone-shaped speaker in the field of audio, and even a diaphragm made of a material which is difficult to adhere to is manufactured in the same manner as an ordinary speaker. The present invention relates to a structure of a speaker that facilitates the operation.

[0002]

2. Description of the Related Art In a cone type speaker that has been widely used in the past, as shown in FIG. 6, a voice coil 12 is attached to the top of a conical diaphragm 11 to form a vibration system. The vibration system includes the voice coil 1 inside the frame 15 having the magnetic circuit 14 at the bottom.
The second winding portion 12b is inserted into the magnetic gap 14a of the magnetic circuit 14 in a vibrating manner, and is held via the edge 13 provided on the outer periphery of the diaphragm 11.

In the cone type speaker having the above structure, the driving force generated in the voice coil 12 is transmitted from the mounting portion to the diaphragm 11 and the diaphragm 11 vibrates to emit a sound wave. The mounting portion of the diaphragm 11 and the voice coil 12 is one of the important parts that influence the performance of the speaker, but conventionally, the voice coil 1 is generally provided in the hole 11a provided at the top of the diaphragm 11.
2 of the bobbin 1 and the inner peripheral surface of the hole 11a
The outer surface of 2a was joined simply by adhesion. Even for diaphragms made of materials that are difficult to bond, such as polypropylene sheets, the simple bonding method is the same as for normal speakers, and it depends on the double coating of the adhesive and the performance of the adhesive itself to improve the adhesive strength. Is the current situation.

There is a speaker described in Japanese Utility Model Laid-Open No. 58-68797 as a structure for strengthening the coupling between the diaphragm and the voice coil by using a diaphragm made of a material that is difficult to adhere. This speaker has a structure in which a connecting portion between the diaphragm and the voice coil winding frame is provided with a protruding portion that fits with each other or a protruding portion that engages adjacently.

[0005]

As described above, in a cone type speaker using a diaphragm made of a material which is difficult to adhere, the diaphragm and the voice coil, which are required to have the highest strength, are attached to each other. There is a drawback that it is difficult to secure a sufficient bonding strength by face-to-face bonding with only an adhesive layer on the adhesive surface, and in the structure described in Japanese Utility Model Laid-Open No. 58-68797, In order to deform the protrusion and insert the voice coil winding frame into the hole at the top of the diaphragm, if the protrusion is made large in order to strengthen the coupling force between the diaphragm and the voice coil, the deformation of the protrusion is prevented. The problem that should be solved is that if it becomes too large and the insertion force becomes too large, it will hinder the assembly, or conversely if the deformation of the protruding part is made small to prevent the insertion force from becoming too large, the coupling force will weaken and the practicality will be lost. Had.

Therefore, according to the present invention, when the diaphragm 11 and the voice coil 12 of the cone-shaped speaker are adhered, a step is provided on the inner peripheral surface of the top of the diaphragm 11 and the outside of the upper portion of the bobbin of the voice coil 12 is provided. An object of the present invention is to provide a speaker having a high reliability and an excellent performance by facilitating the fixing force of the adhesive by forming the engaging portion with the step portion on the side surface and facilitating the assembling.

[0007]

A speaker according to the present invention for achieving the above object will be described with reference to the reference numerals used in the embodiments shown in FIGS. 1 to 4.
The annular protrusion 1a formed on the inner peripheral surface of the top of the cone-shaped diaphragm 1 and the voice coil winding frame 2a of the voice coil 2 are connected to the vibration plate 1 at a plurality of positions downward from the side surface of the winding frame 2a. And a pair of tongue-shaped cut-and-raised pieces 2b and 2c formed so as to be valgus upward, and the cut-and-raised pieces 2b and 2c are provided.
A vibration system A in which the cone-shaped diaphragm 1 and the voice coil 2 are adhesively bonded with the annular protrusion 1a sandwiched between the tongue ends of the Inside the attached frame 6, the voice coil 2
Is a cone-shaped speaker characterized in that it is retained in a state that it is oscillatably fitted in the magnetic gap of the magnetic circuit 5.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a cone type speaker of the present invention will be described based on the first embodiment shown in FIGS. In the side cross-section shown in FIG. 1, reference numeral 1 denotes a cone-shaped diaphragm, which has a conical shape, and a voice coil 2 is attached to a cone-shaped top portion 1b to form a main part of a vibration system. An edge 3 for supporting the diaphragm 1 is attached to the outer periphery of the diaphragm 1. A damper 7 for further stabilizing the holding of the vibration system is attached to the bonding portion between the voice coil 2 and the diaphragm 1, that is, in the vicinity of the top 1b of the diaphragm 1.

FIG. 2 shows a half cross section of an essential part of the diaphragm 1 which is one of the constituent features. A hole 1c into which the voice coil 2 is inserted and attached is provided at the top 1b of the cone-shaped main body 1d. An annular protrusion 1a is formed on the inner peripheral surface of the hole 1c. Such an annular protruding portion 1a has a cross-sectional shape of a mold when the material of the diaphragm 1 is thermoformed or press-formed.
By having a predetermined shape as shown in (3), it is possible to easily manufacture without replacing the conventional manufacturing process at all.

FIG. 3 is a perspective view of the voice coil 2 of the embodiment of the present invention, showing its outer shape, in which an insulated wire is wound around the winding frame 2a to form a winding portion 2d. A set of tongue-shaped cut-and-raised pieces 2 which valgus downwardly and upwardly from the side surface of the winding frame 2a at a plurality of places of the winding frame 2a where the diaphragm 1 is connected.
b, 2c are formed. The distance La between the tip of the cut-and-raised pieces 2b and the tip of the cut-and-raised pieces 2c is smaller than the width Lo of the annular protrusion 1a, and the root of the pair of cut-and-raised pieces 2b is formed. The distance Lb between the cut-and-raised piece 2c and the root of the cut-and-raised piece 2c is set to be larger than the width Lo.

Such a winding frame 2a is a sheet of material, and cut and raised pieces 2b, 2 when cut into an expanded shape.
c is simultaneously formed by the press. Then, in the winding process during manufacturing of the voice coil 2, the voice coil 2 is wound around the core to have a cylindrical shape. Therefore, even in the voice coil, the press die is the same as in the diaphragm, and the manufacturing process is not different from the conventional one.

FIG. 4 shows the connected state of the diaphragm 1 and the voice coil 2. Hole 1 provided on top 1b of diaphragm 1
The winding frame 2a of the voice coil 2 is inserted into c, and the annular protrusion 1a is sandwiched between the tip of the pair of cut and raised pieces 2b and the tip of the cut and raised piece 2c. There is. An adhesive 3 is applied and interposed between the inner peripheral surface of the annular protrusion 1a inside the hole 1c and the upper outer surface of the winding frame 2a. The adhesive 3
Also flows into the tips of the cut-and-raised pieces 2b and 2c and the vicinity of the end faces of the annular protrusion 1a, solidifies, and contributes to strengthening the adhesive force.

The process of assembling the vibration system is performed by the magnetic circuit 5
Voice coil 2 held by a jig in the magnetic gap of
Insert the winding frame 2a into the hole at the top of the diaphragm 1 from above,
The diaphragm 1 is moved downward. Next, the bobbin 2 of the voice coil 2 is provided inside the annular protrusion 1a formed on the diaphragm 1.
With the a inserted, the diaphragm 1 is further moved downward,
The inner circumference of the annular protrusion 1a deforms the tip of the cut-and-raised piece 2b with the tip facing downward, and at the same time, the lower end face of the annular protrusion 1a cuts with the tip facing upward. The cut-raised piece 2b returns to its original shape at the time when the tip of the raised piece 2c is bent outward and cut and raised, passing through the site of the piece 2b, and the annular projection 1a cut-raised and finished passing through the piece 2b. Stand up,
The cut-and-raised piece 2c also returns to its original shape by elasticity and the cut-and-raised piece 2c is sandwiched between the tongue ends of the cut-and-raised pieces 2b and 2c, and the cone-shaped diaphragm 1 holds the voice coil. Hold on top of two.

The adhesive is applied to the inside of the annular protrusion 1a formed on the diaphragm 1 as described above, and the winding frame 2a of the voice coil 2 is provided.
At the time of insertion, the coating is applied in advance to the site where each cut-and-raised piece is formed, or the annular protrusion 1a of the diaphragm 1 is placed between the tongue ends of the cut-and-raised pieces 2b and 2c. Sandwiched, vibrating plate 1
May be applied at the time of being held on the voice coil 2. After that, the adhesive is dried and solidified, and the cone-shaped diaphragm 1 and the voice coil 2 are firmly bonded and bonded.

[0015]

EXAMPLES Examples of the cone type speaker of the present invention will be described below. The structure and operation of the basic elements of the first embodiment are as described in detail in the section of the above-mentioned embodiment with reference to FIGS. A set formed by valving downward and upward from the side surface of the winding frame 2a at a plurality of coupling portions between the formed annular protrusion 1a and the diaphragm 1 of the voice coil winding frame 2a of the voice coil 2. Tongue-shaped cut-and-raised pieces 2b and 2c, and the cone-shaped diaphragm 1 with the annular protruding portion 1a sandwiched between the tongue ends of the cut-and-raised pieces 2b and 2c. A vibration system A, which is adhesively bonded to the voice coil 2, is fitted inside a frame 5 having a magnetic circuit 4 mounted at the center of the bottom thereof so that the voice coil 2 can vibrate in a magnetic gap of the magnetic circuit 5. The cone-shaped speaker is characterized in that it is held in the inserted state.

At the time of assembly, the bobbin 2 of the voice coil 2 is provided inside the annular protrusion 1a formed on the diaphragm 1.
With the a inserted, the diaphragm 1 is moved downward so that the inner circumference of the annular protrusion 1a deforms the tip of the cut-and-raised piece 2b with the tip facing downward, and simultaneously the annular The lower end surface of the projecting portion 1a has a tip end facing upward, and the tip end portion of the cut and raised piece 2c is pushed outward while bending the cut and raised piece 2b.
When the annular protruding portion 1a cuts and rises and finishes passing through the piece 2b, the cut-raised piece 2b returns to its original shape, and the cut-raised piece 2c also returns to its original shape by elasticity and cut-raised. The cone-shaped diaphragm 1 is held above the voice coil 2 with the annular protrusion 1a sandwiched between the tongue ends of the strips 2b and 2c.

At this time, the cut-and-raised piece is much more flexible than the protrusion of the conventional example, and the insertion force for inserting the winding frame 2a inside the annular protrusion 1a of the diaphragm 1 is different from the conventional one. Differently, it doesn't have to be too big.

The cut-raised pieces are provided at six locations in this embodiment shown in the figure, but normally four to eight locations are suitable from the standpoint of productivity.

FIG. 5 is a perspective view of a modification of the above embodiment. This is a shape in which a continuous portion 2d with the winding frame 2a remains at the portion of the cut-and-raised pieces 2b, 2c of the winding frame 2a that is left behind.
This modified example uses the continuous portion 2d at the time of assembly,
Since the adhesive is prevented from flowing into the inside of the voice coil 2 from the removal mark, it is possible to prevent the malfunction from occurring due to the inflow of the adhesive.

The embodiments which are considered to be representative of the present invention have been described above. However, the present invention is not necessarily limited to the structures of the embodiments, but has the above-mentioned constitutional requirements according to the present invention, and The present invention achieves the object of the present invention and can be appropriately modified and implemented within the range having the following effects.

[0021]

As is apparent from the above description, the cone-shaped speaker according to the present invention is a cut-and-raised piece formed on the winding frame in the work of adhering the diaphragm and the winding frame of the voice coil. Since the diaphragm is held at the attachment position and the cut-and-raised pieces are also used to strengthen the bonding force, even a diaphragm made of a material such as polypropylene that is difficult to adhere can be firmly bonded. Therefore, the transmission of the driving force to the diaphragm is perfect, and it is possible to provide a speaker of stable quality which makes good use of the performance of the material, has an excellent timbre, and is durable.

Further, since the cut-and-raised pieces formed on the winding frame can be manufactured and processed by using an ordinary press, the cost of parts does not increase. Further, the above-mentioned bonding process easily bends, and no special work is required for assembly. Therefore, it is possible to keep the manufacturing cost of the speaker low as a whole in combination with the fact that the cost of the parts does not increase without changing the man-hours required for the work.

With the above advantages, it is possible to inexpensively provide a speaker having an excellent tone color and a stable quality, which makes full use of the characteristics of the diaphragm material.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of essential parts of a diaphragm according to an embodiment.

FIG. 3 is a perspective view of a voice coil of the embodiment.

FIG. 4 is a perspective view of a main part of the vibration system according to the embodiment.

FIG. 5 is a perspective view of a voice coil of a modified example.

FIG. 6 is a side sectional view of a conventional example.

[Explanation of symbols]

 1 Vibration Plate 2 Voice Coil 3 Adhesive 4 Edge 5 Magnetic Circuit 6 Frame 7 Damper A Vibration System

Claims (1)

[Claims] 1. An annular protrusion (1a) formed on the inner peripheral surface of the top of a cone-shaped diaphragm (1), and the diaphragm (1) of a voice coil reel (2a) of a voice coil (2). At a plurality of binding sites with, a pair of tongue-shaped cut-and-raised pieces (2b), (2c) formed by valgus downward and upward from the side surface of the reel (2a), and,
The cone-shaped diaphragm (1) and the voice coil (2) with the annular protrusion (1a) being sandwiched between the tongue ends of the cut-and-raised pieces (2b) and (2c). Vibration system adhesively bonded (A)
However, inside the frame (6) in which the magnetic circuit (5) is attached to the center of the bottom, the voice coil (2) has the magnetic circuit (5).
A cone-shaped speaker characterized in that the cone-shaped speaker is held so as to be oscillatably fitted in the magnetic air gap.