JP2000156898A - Speaker device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to easily position respective primary coils and to improve the fitting strength of the primary coils. SOLUTION: The speaker unit is provided with a bobbin 14 fixed on a diaphragm 4, a york 2 with a positioning part 8 and forming a magnetic circuit together with a magnet 3, primary coils 16, 17 arranged in a magnetic gap 13 and capable of receiving a voice signal, and a secondary coil 15 fit to the bobbin 14 and arranged in a magnetic gap 13. Cylindrical bodies 18, 19 are provided to the respective one-end parts of which are respectively connected to the primary coils 16, 17 and the other end parts of which are connected to the positioning part 8 of the york 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a speaker device. More specifically, the present invention relates to a technology that enables easy positioning of a primary coil and improves mounting strength of the primary coil.

[0002]

2. Description of the Related Art Conventionally, an electromagnetic induction speaker has been known. This speaker has a so-called inner-magnet type electromagnetic induction speaker in which a magnet is arranged inside and a so-called outer-magnet type electromagnetic induction speaker in which a magnet is arranged outside. There is a speaker.

As shown in FIG. 6, an internal magnet type electromagnetic induction speaker 100 includes a yoke 110, a magnet 120 and a diaphragm 130.

The yoke 110 has a disk-shaped bottom portion 111 and a peripheral wall portion 112 projecting upward from the periphery of the bottom portion 111.
And an annular annular plate 113 provided on the upper edge of the peripheral wall portion 112 are integrally formed. A columnar magnet 120 is attached to the center of the upper surface of the bottom part 111. The yoke 110 has the upper surface of the annular plate 113 attached to the frame 140.

A disk-shaped center plate 150 is mounted on the upper surface of the magnet 120.
Is located within. A gap formed between the annular plate 113 and the center plate 150 is formed as a magnetic gap 160.

The vibrating plate 130 has a substantially hemispherical dome portion 131 located at the center portion and a small arc-shaped edge portion 13 provided continuously on the outer periphery of the dome portion 131.
2 are formed integrally, and the outer end of the edge 132 is attached to the upper surface of the frame 140. A cylindrical bobbin 170 is provided on the outer peripheral edge of the dome portion 131.
Is fixed by bonding or the like.

A one-turn secondary coil 171 is wound and fixed to a portion near the lower end of the bobbin 170, and the secondary coil 171 is fixed to the annular plate 113 and the center plate 1.
50 are located in a magnetic gap 160 formed therebetween.

The secondary coil 17 is provided in the magnetic gap 160.
The outer peripheral side primary coil 180 and the inner peripheral side primary coil 190 are arranged so as to face each other with 1 therebetween.
The outer primary coil 180 is fixed to the inner peripheral surface of the annular plate 113 of the yoke 110, and the inner primary coil 190 is fixed to the outer peripheral surface of the center plate 150.
The secondary coil 180 and the inner peripheral primary coil 190 are connected in series. One end of the outer peripheral side primary coil 180 and one end of the inner peripheral side primary coil 190 are respectively connected to the signal lead wire 180.
a, 190a.

When a current is supplied to the outer primary coil 180 and the inner primary coil 190, an induced current flows through the secondary coil 171 disposed in the magnetic gap 160, and vibrates due to Lorentz force. The plate 130 vibrates to generate sound.

As shown in FIG. 7, the external magnetic induction speaker 200 includes a yoke 210, a magnet 220, and a diaphragm 230.

The yoke 210 has a disk-shaped bottom portion 211.
And a center pole 212 protruding upward from the center of the bottom portion 211.
A cylindrical magnet 220 is attached to an outer end of the upper surface of the first magnet 220.

An annular annular plate 240 is mounted on the upper surface of the magnet 220, and the annular plate 240 is located corresponding to the upper end of the center pole 212. The upper surface of the outer end of the annular plate 240 is attached to the frame 250. In addition, a gap formed between the annular plate 240 and the center pole 212 is formed as a magnetic gap 260.

The diaphragm 230 has a central portion 231 having an arcuate cross-sectional shape located at the central portion, an inclined portion 232 continuously provided on the outer periphery of the central portion 231 and being displaced upward as going outward. An edge portion 233 continuous with the outer periphery of the portion 232 and a fixing portion 234 provided continuously with the outer periphery of the central portion 231 and projecting in the opposite direction to the inclined portion 232;
The outer end of the edge 233 is attached to the upper surface of the outer end of the frame 250. The upper end of a cylindrical bobbin 270 is fixed to the distal end of the fixing portion 234 by bonding or the like.

A one-turn secondary coil 271 is wound and fixed to a portion near the lower end of the bobbin 270, and the secondary coil 271 is fixed to the annular plate 240 and the center pole 21.
2 are located in a magnetic gap 260 formed between the two.

A secondary coil 27 is provided in the magnetic gap 260.
The outer peripheral side primary coil 280 and the inner peripheral side primary coil 290 are arranged so as to face each other with 1 therebetween.
The outer peripheral side primary coil 280 is fixed to the inner peripheral surface of the annular plate 240, the inner peripheral side primary coil 290 is fixed to the upper end of the outer peripheral surface of the center pole 212, and the outer peripheral side primary coil 280 and the inner peripheral side The secondary coil 290 is connected in series. One end of the outer peripheral side primary coil 280 and one end of the inner peripheral side primary coil 290 are connected to signal lead wires 280a, 290, respectively.
a.

When a current is supplied to the outer primary coil 280 and the inner primary coil 290, an induced current flows through the secondary coil 271 disposed in the magnetic gap 260, and vibrates due to Lorentz force. The plate 230 vibrates to generate sound.

[0017]

By the way, the above-mentioned 1
When fixing the secondary coils 180, 190, 280, 290 to the annular plates 113, 240 or the center plate 150 or the center pole 212, there are generally the following two methods.

(1) The primary coils 180, 190, 280, 290 are wound around the outer peripheral surface of a cylindrical bobbin (not shown) and fixed to the annular plates 113, 240 in a state where they are fixed.
And fixed by bonding or the like.

(2) The primary coil 18 without using a bobbin
0, 190, 280, and 290 are wound (formed as a bobbin-less coil) in an annular plate 113, 2
40, or externally fitted to the center plate 150 or the center pole 212 and fixed by bonding or the like.

In general, the above-described bobbin and the primary coil 18 fitted inside the annular plates 113 and 240 or fitted outside the center plate 150 or the center pole 212.
0, 190, 280 and 290 are very thin and have low mechanical strength, so that when they are fitted inside the annular plates 113 and 240 or outside fitted on the center plate 150 or the center pole 212, the bobbin and the primary coil 18 are hardened.
0, 190, 280, 290 are annular plates 113, 2
40, center plate 150, center pole 212
It is necessary to prevent breakage and the like by avoiding contact with the substrate.

Therefore, in any of the above methods,
In a state where the primary coils 180 and 280 are wound in advance, the outer diameter is slightly smaller than the inner diameter of the annular plates 113 and 240 so that the primary coils 180 and 280 and the annular plate 1
13 and 240 are filled with an adhesive and fixed.
In the state where the secondary coils 190 and 290 are wound, the inner diameter is slightly larger than the outer diameter of the center plate 150 or the center pole 212 so that the primary coil 190 or 290 is positioned between the primary coils 190 and 290 and the center plate 150 or the center pole 212. The adhesive is filled and fixed.

However, the annular plates 113, 240,
The center plate 150 and the center pole 212
Since both are thin, the area of each peripheral surface is small, and there is a problem that the bonding strength between the primary coils 180, 190, 280, 290 and the annular plates 113, 240, the center plate 150, and the center pole 212 is weak. .

Also, usually, the internal magnet type electromagnetic induction speaker 1
00, the inner peripheral side primary coil 190 is fixed to the center plate 150,
Is fixed to the magnet 120 attached to the yoke 110 while being positioned. On the other hand, in the case of the external magnet type electromagnetic induction speaker 200, the outer peripheral side primary coil 280 is fixed to the annular plate 240,
0 is fixed to the magnet 220 attached while being positioned on the yoke 110.

When performing the fixing operation, the outer peripheral side primary coil 180 and the inner peripheral side primary coil 190 are maintained in order to maintain a predetermined gap between the magnetic gaps 160 and 260 in advance.
Or a gap gauge is inserted between the outer peripheral side primary coil 280 and the inner peripheral side primary coil 290 to adjust the gap interval so as to be constant in the circumferential direction to position each member. If the gap gauge comes into contact with the primary coils 180, 190, 280, 290 during this positioning work, the primary coils 180, 19
0, 280, 290 may fall off from the annular plates 113, 240, the center plate 150, and the center pole 212.

Accordingly, it is an object of the speaker device of the present invention to overcome the above-mentioned problems, enable easy positioning of the primary coil, and improve the mounting strength of the primary coil.

[0026]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a speaker device according to the present invention comprises: a bobbin fixed to a diaphragm; a yoke in which a magnetic circuit is formed together with a magnet and a positioning portion is formed; A primary coil disposed in the gap to receive an audio signal; and a secondary coil disposed on the bobbin and disposed in the magnetic gap. A cylindrical body is provided, the end of which is attached to a positioning portion of the yoke.

Therefore, in the speaker device of the present invention, it is not necessary to use a gap gauge to obtain a predetermined magnetic gap interval, and the mounting area of the primary coil is increased.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the speaker device of the present invention will be described below with reference to the accompanying drawings.

In the embodiments described below, the present invention is applied to an electromagnetic induction speaker.

First, an internal magnet type electromagnetic induction speaker 1 shown in FIG. 1 will be described as a first embodiment.

The internal magnet type electromagnetic induction speaker 1 includes a yoke 2, a magnet 3, and a diaphragm 4.

The yoke 2 includes a substantially disk-shaped bottom portion 5, a peripheral wall portion 6 protruding upward from a peripheral edge of the bottom portion 5, and an annular annular plate 7 provided on an upper edge of the peripheral wall portion 6. Are integrally formed. A positioning portion 8 is formed on the upper surface of the central portion of the bottom portion 5.

The positioning portion 8 is formed in a stepped shape when viewed in a vertical cross-sectional shape, and has a first step 9 and a second step 10 formed integrally with the bottom 5. The first step 9 has a disk shape,
The outer peripheral surface 9 a is formed as a first step surface, and the upper surface 9 a
b is located slightly above the upper surface of the bottom portion 5. Second
The step 10 has a disk shape slightly smaller than the first step 9 and is provided coaxially with the first step 9. And
The outer peripheral surface 10 a of the second step 10 is formed as a second step surface, and the upper surface 10 b is located slightly above the upper surface 9 b of the first step 9.

At the center of the upper surface 10b of the second step 10, a columnar magnet 3 is mounted.
Are arranged in, for example, positioning recesses (not shown) formed on the upper surface 10b of the second step portion 10, so that the second
Are arranged coaxially with the step portion 10 of FIG.

The yoke 2 has the upper surface of the annular plate 7 attached to the frame 11. And the annular plate 7
Is located slightly outside the first step surface 9a of the first step portion 9 with reference to the center axis of the positioning portion 8.

A disk-shaped center plate 12 formed as a center member is mounted on the upper surface of the magnet 3, and the center plate 12 is
In the center hole 7a. The peripheral surface of the center plate 12 is located at the same phase as the second step surface 10a of the second step portion 10 with reference to the center axis of the positioning portion 8. A gap formed between the annular plate 7 and the center plate 12 is formed as a magnetic gap 13.

The vibrating plate 4 is formed integrally with a substantially hemispherical dome portion 4a located at the center and an edge portion 4b having a small and substantially arcuate cross section and provided continuously on the outer periphery of the dome portion 4a. The outer end of the edge portion 4 b is attached to the upper surface of the frame 11. And the dome part 4
The upper end of a cylindrical bobbin 14 is fixed to the outer peripheral edge of the portion a by bonding or the like.

A one-turn secondary coil 15 is wound and fixed to a portion near the lower end of the bobbin 14, and the secondary coil 15 is formed by a magnetic gap 13 formed between the annular plate 7 and the center plate 12. Is located within.

In the magnetic gap 13, the outer circumferential primary coil 16 is opposed to each other with the secondary coil 15 interposed therebetween.
And an inner peripheral side primary coil 17 are arranged. And
The outer peripheral side primary coil 16 and the inner peripheral side primary coil 17 are connected in series, and one end of each is connected to a signal lead wire 16a, 17a.
It is connected to the.

The outer peripheral side primary coil 16 is wound around and fixed to the outer periphery of the upper end of a first cylindrical body 18 having a thin cylindrical shape. The inner diameter of the first cylindrical body 18 is the first stepped portion 9.
Is formed to have the same outer diameter. The inner surface of the lower end of the first cylindrical body 18 is adhered to the first step surface 9 a of the first step 9 of the positioning portion 8.
The outer peripheral surface of the outer peripheral side primary coil 16 fixed to the inner surface of the annular plate 7 is adhered.

The outer peripheral side primary coil 16 fixed to the first cylindrical body 18 is fixed to the yoke 2 by, for example, inserting the first cylindrical body 18 into the yoke 2 from above and lowering the lower end. This is performed by bonding to the first step surface 9 a and bonding the outer peripheral surface of the outer peripheral side primary coil 16 to the inner peripheral surface of the annular plate 7.

The inner peripheral side primary coil 17 is wound and fixed around the outer periphery of the upper end of a second cylindrical body 19 having a thin cylindrical shape. The inner diameter of the second cylindrical body 19 is the second stepped portion 1.
It has the same outer diameter as 0. The inner surface of the lower end of the second cylindrical body 19 is the second step 1 of the positioning portion 8.
0 is adhered to the second step surface 10 a, and the inner peripheral surface of the upper end of the second cylindrical body 19 is adhered to the outer peripheral surface of the center plate 12.

The inner peripheral side primary coil 17 fixed to the second cylindrical body 19 is fixed to the yoke 2 by, for example, fitting the second cylindrical body 19 to the center plate 12 in advance and setting the upper end thereof. The inner surface of the portion is adhered to the center plate 12, and the second cylindrical body 19 is inserted into the yoke 2 from above while being fixed to the center plate 12, and the lower end portion is inserted into the second step surface 1.
This is performed by adhering to Oa. Then, the second cylindrical body 19 is externally fitted to the second step portion 10 of the positioning portion 8 to position the inner peripheral side primary coil 17 with respect to the yoke 2, thereby being attached to the yoke 2. The center plate 12 is positioned with respect to the magnet 3 at the same time. The fixing of the center plate 12 to the magnet 3 is performed by using an appropriate means such as bonding or screwing.

As described above, in the internal magnet type electromagnetic induction speaker 1, the positioning portion 8 is formed on the yoke 2 and the first cylindrical body 18 to which the outer peripheral side primary coil 16 is fixed. By simply externally fitting the second cylindrical body 19 to which the inner peripheral side primary coil 17 is fixed to the first step portion 9 and the second step portion 10 of the positioning portion 8, respectively, the outer peripheral side primary coil 17 is formed. 1
6 and the inner peripheral side primary coil 17 can be positioned with respect to the yoke 2.

Accordingly, the positioning of the outer primary coil 16 and the inner primary coil 17 with respect to the yoke 2 can be performed extremely easily, and there is no need to use a gap gauge. Alternatively, there is no risk of dropping from the yoke 2 or the like due to contact with the inner peripheral side primary coil 17.

Further, the first cylindrical body 18 is bonded to the first step surface 9a of the positioning portion 8 and the first cylindrical body 18
Is fixed to the annular plate 7, and the second cylindrical body 19 is bonded to the second step surface 10 a of the positioning portion 8 and to the center plate 12. Therefore, the bonding area increases as the number of bonding locations increases, and the bonding strength between the outer primary coil 16 and the inner primary coil 17 improves.

The positioning portion 8 need only be formed with two steps 9, 10 on the bottom surface 5 of the yoke 2, and the positioning portion 8 can be easily formed.

In the positioning section 8, the steps 9 and 10 are formed so that the center of the yoke 2 is located at the uppermost position. Conversely, the steps 9 and 10 are formed such that the center of the yoke 2 is located at the lowermost position. The positioning portion may be provided by forming a concave portion such that the bottom surface is displaced stepwise downward.

The inner magnet type electromagnetic induction speaker 1 shown in FIG.
Is arranged such that the primary coils face each other with the secondary coil interposed therebetween. However, in the present invention, the primary coil as shown in FIG. 2 is arranged only on one side of the secondary coil. Can be applied to the internal magnet type electromagnetic induction speaker 1A.

The inner-magnet-type electromagnetic induction speaker 1A described below is different from the inner-magnet-type electromagnetic induction speaker 1 in that the primary coil is arranged only on one side of the secondary coil. Corresponding to this, the only difference is that only one step portion is provided as a positioning portion. Therefore, in the description of the internal magnet type electromagnetic induction speaker 1A, compared with the internal magnet type electromagnetic induction speaker 1, Only the different parts will be described in detail, and the other parts will be denoted by the same reference numerals as those of the similar parts in the internal magnet type electromagnetic induction speaker 1, and the description thereof will be omitted.

The positioning portion 8A is formed by forming a disc-shaped step portion 10A, and its outer peripheral surface 10c is formed as a step surface.

In the magnetic gap 13, a primary coil 17A is arranged between the secondary coil 15 and the center plate 12. The primary coil 17A is connected to the signal lead 17
a.

The primary coil 17A is wound and fixed on the outer periphery of the upper end of a thin cylindrical body 19A.
The cylindrical body 19A is formed to have the same inner diameter as the outer diameter of the step 10A. The lower end of the cylindrical body 19A is bonded to the stepped surface 10c of the step 10A of the positioning portion 8A, and the inner peripheral surface of the upper end of the cylindrical body 19A is bonded to the outer peripheral surface of the center plate 12. ing.

The primary coil 17 fixed to the cylindrical body 19A
The A is fixed to the yoke 2 by, for example, fitting the cylindrical body 19A to the center plate 12 in advance, bonding the inner surface of the upper end to the center plate 12, and fixing the cylindrical body 19A to the center plate 12. The body 19A from above with the yoke 2
This is performed by inserting into the inside and bonding the lower end to the step surface 10c, and fixing the center plate 12 to the magnet 3 by bonding or the like.

Thus, the internal magnet type electromagnetic induction speaker 1A
Even if the primary coil 17A is arranged only on one side of the secondary coil 15 as shown in FIG.
The positioning of the 7A with respect to the yoke 2 can be performed very easily.

The above-mentioned positioning portion 8A is provided with a step portion 10A.
Although the positioning portion 8A is formed as a concave portion,
The outer peripheral surface of the lower end portion of the tubular body 19A may be bonded to the peripheral surface of the concave portion.

The above-described inner-magnet-type electromagnetic induction speaker 1A has a primary coil 17A disposed between the secondary coil 15 and the center plate 12 in the magnetic gap 13; The primary coil may be arranged between the secondary coil 15 and the annular plate 7 in the above.

The internal magnet type electromagnetic induction speaker 1B shown in FIG.
The first cylindrical body to which the outer peripheral side primary coil is fixed is directly bonded to the annular plate 7.

The internal magnetic induction speaker 1B described below is different from the internal magnetic induction speaker 1 only in that the first cylindrical body is directly adhered to the annular plate. Therefore, in the description of the inner-magnet-type electromagnetic induction speaker 1B, only the parts different from those of the inner-magnet-type electromagnetic induction speaker 1 will be described in detail, and the other parts of the inner-magnet-type electromagnetic induction speaker 1 will be described. The same reference numerals are given to the same parts and the description is omitted.

The outer peripheral side primary coil 16 is wound and fixed on the inner periphery of the upper end of a first cylindrical body 18A having a thin cylindrical shape. The first cylindrical body 18 </ b> A is formed to have the same inner diameter as the outer diameter of the first step portion 9. The inner surface of the lower end of the first cylindrical body 18A is adhered to the first stepped surface 9a of the first step portion 9 of the positioning portion 8, and the outer peripheral surface of the first cylindrical body 18A is annular. It is adhered to the inner peripheral surface of the plate 7.

Generally, when the primary coil is directly bonded to the inner surface of the annular plate, the outer surface of the primary coil is not flat, so that a flat surface must be formed with an adhesive before bonding, which is very troublesome. Further, when the cylindrical body is inserted into the yoke, the primary coil comes into contact with the inner surface of the annular plate, and
The next coil may be damaged.

However, by bonding the outer peripheral side primary coil 16 to the annular plate 7 via the first cylindrical body 18A as in the above-described inner magnet type electromagnetic induction speaker 1B, the bonding operation is very easy. In addition, there is no possibility that the outer peripheral side primary coil 16 contacts the annular plate 7 to cause damage.

The inner magnet type electromagnetic induction speaker 1C shown in FIG.
Has a positioning portion formed as an annular groove.

The internal magnetic type electromagnetic induction speaker 1C shown below differs from the above-described internal magnetic type electromagnetic induction speaker 1 only in that the positioning portion is formed as an annular groove. In the description of the magnetic type electromagnetic induction speaker 1C, only the different parts as compared with the internal type electromagnetic induction speaker 1 will be described in detail, and the other parts will be the same as those of the internal type electromagnetic induction speaker 1. The same reference numerals are given to the reference numerals, and the description is omitted.

The positioning portion 8B is composed of two annular first grooves 20 formed on concentric circles formed on the bottom surface 5 and a second groove 21 located inside the first grooves.

The outer peripheral side primary coil 16 is provided with a first cylindrical body 18.
Is wound around and fixed to the outer periphery of the upper end. The lower end of the first cylindrical body 18 is fixed in the first groove 20 and the outer peripheral surface of the outer peripheral side primary coil 16 is
Is adhered to the inner peripheral surface of the.

The outer peripheral side primary coil 16 fixed to the first cylindrical body 18 is fixed to the yoke 2 by, for example, inserting the first cylindrical body 18 into the yoke 2 from above and lowering the lower end. This is performed by fixing the outer peripheral surface of the outer peripheral side primary coil 16 to the inner peripheral surface of the annular plate 7 while fixing it in the first groove 20.

The inner peripheral side primary coil 17 is connected to the second cylindrical body 19.
Is wound around and fixed to the outer periphery of the upper end. The lower end of the second cylindrical body 19 is fixed in the second groove 21, and the inner peripheral surface of the upper end of the second cylindrical body 19 is bonded to the outer peripheral surface of the center plate 12.

The inner peripheral side primary coil 17 fixed to the second cylindrical body 19 is fixed to the yoke 2 by, for example, fitting the second cylindrical body 19 to the center plate 12 in advance and setting the upper end thereof. The inner surface of the portion is adhered to the center plate 12, and the second cylindrical body 19 is inserted into the yoke 2 from above while being fixed to the center plate 12, and the lower end is fixed to the second groove 21. Performed by

However, the positioning portion 8B only needs to form the two grooves 20, 21 in the bottom portion 5 of the yoke 2, and the formation of the positioning portion 8A is extremely easy.

In the internal magnet type electromagnetic induction speaker 1C, the first cylindrical body 18 and the second cylindrical body 19 are fixed so as to be fitted in the first groove 20 and the second groove 21, respectively. Therefore, the mounting strength of the outer peripheral side primary coil 16 and the inner peripheral side primary coil 17 can be further improved.

Next, an external magnet type electromagnetic induction speaker 22 shown in FIG. 5 will be described as a second embodiment.

The outer magnet type electromagnetic induction speaker 22 is a yoke 2
3, a magnet 24 and a diaphragm 25.

The yoke 23 is formed integrally with a bottom portion 26 and a center pole 27 protruding upward from the center of the bottom portion 26. The center pole 27 is formed as a center member. A positioning portion 28 is integrally formed on the upper surface at the center of the bottom portion 26.

The positioning portion 28 is formed as a step 29 having a disk shape. And the outer peripheral surface 29a of the step portion 29
Is formed as a stepped surface, and the upper surface 29b is located slightly above the upper surface of the bottom portion 26. The center pole 27 is provided integrally at the center of the upper surface 29b of the step portion 29.

A cylindrical magnet 24 is attached to the outer end of the upper surface of the bottom part 26. The magnet 24 is arranged coaxially with the step portion 29 and the center pole 27 by, for example, being arranged in a positioning recess (not shown) formed on the upper surface of the bottom portion 26.

An annular plate 30 is attached to the upper surface of the magnet 24.
Are located corresponding to the upper end of the center pole 27, that is, the upper end of the center pole 27 is located in the center hole 30a of the annular plate 30. The upper surface of the outer end of the annular plate 30 is attached to the frame 31. In addition, the annular plate 30 and the center pole 2
7 is formed as a magnetic gap 32.

The inner peripheral surface of the annular plate 30 is
8 is located slightly outside the step surface 29a of the step 29 with reference to the central axis of the step 29.

The diaphragm 25 has a central portion 25a which is located at the central portion and has an arc-shaped cross section, an inclined portion 25b which is continuously provided on the outer periphery of the central portion 25a, and which is displaced upward as going outward. Edge portion 2 continuous with the outer periphery of portion 25b
5c and the inclined portion 2 provided continuously on the outer periphery of the central portion 25a.
5b and a fixing portion 33 protruding in the opposite direction. The outer end of the edge portion 25c is attached to the upper surface of the outer end of the frame 31. The upper end of a cylindrical bobbin 34 is fixed to the tip of the fixing portion 33 by bonding or the like.

A one-turn secondary coil 35 is wound and fixed to a portion near the lower end of the bobbin 34, and the secondary coil 35 is attached to a magnetic gap 32 formed between the annular plate 30 and the center pole 27. Is located within.

In the magnetic gap 32, an outer peripheral side primary coil 36 and an inner peripheral side primary coil 37 are arranged so as to be opposed to each other with a secondary coil 35 interposed therebetween. The outer primary coil 36 is fixed to the inner peripheral surface of the annular plate 30, and the inner primary coil 37 is fixed to the upper end of the outer peripheral surface of the center pole 27. The secondary coil 37 is connected in series. One ends of the outer peripheral side primary coil 36 and the inner peripheral side primary coil 37 are connected to signal lead wires 36a and 37a, respectively.

The outer peripheral side primary coil 36 is wound and fixed around the outer periphery of the upper end of a first cylindrical body 38 having a thin cylindrical shape. The inner diameter of the first cylindrical body 38 is
8 are formed to have the same outer diameter as the step portion 29. And
The inner surface of the lower end of the first cylindrical body 38 is adhered to the step surface 29 a of the step portion 29, and the outer peripheral surface of the outer peripheral side primary coil 36 fixed to the first cylindrical body 38 is formed by the annular plate 30. Is adhered to the inner peripheral surface of the.

The outer primary coil 36 fixed to the first cylindrical body 38 is fixed to the yoke 23 by, for example, being fixed to the inner cylindrical surface of the annular plate 30 in advance. The outer peripheral side primary coil 36 is bonded to the annular plate 3
In this state, the first cylindrical body 38 is inserted into the center hole 24a of the magnet 24 from above, and the lower end is bonded to the step surface 29a of the step portion 29 of the positioning portion 28 while the first cylindrical member 38 is fixed at zero. Then, the outer peripheral side primary coil 36 is positioned with respect to the yoke 2 by externally fitting the first cylindrical body 38 to the step portion 29, thereby positioning the annular plate 30 with respect to the magnet 24 attached to the yoke 2. Will be done at the same time. The fixing of the magnet 24 to the annular plate 30 is performed using an appropriate means such as adhesion or screwing.

The inner peripheral side primary coil 37 is wound and fixed around the outer periphery of the upper end of a second cylindrical body 39 having a thin cylindrical shape. The inner diameter of the second cylindrical body 39 is substantially the same as the outer diameter of the center pole 27. And the second
The cylindrical body 39 is adhered with its inner surface fitted to the center pole 27 outside.

The inner peripheral side primary coil 37 fixed to the second cylindrical body 39 is fixed to the center pole 27 by, for example,
This is performed by externally fitting and bonding the second cylindrical body 39 to the center pole 27.

As described above, in the case of the external magnet type electromagnetic induction speaker 22, the positioning portion 2 is attached to the yoke 2.
8 is formed, and the outer peripheral side primary coil 36 is fixed to the first
The cylindrical body 38 and the second cylindrical body 39 to which the inner peripheral side primary coil 37 is fixed are externally fitted to the step 29 of the positioning portion 28 and the center pole 27 formed integrally with the yoke 2, respectively. Thus, the outer primary coil 36 and the inner primary coil 37 can be positioned with respect to the yoke 2.

Therefore, the positioning of the outer peripheral side primary coil 36 and the inner peripheral side primary coil 37 with respect to the yoke 2 can be performed extremely easily, and there is no need to use a gap gauge. Alternatively, there is no risk of falling off from the yoke 2 or the like due to contact with the inner peripheral side primary coil 37.

Further, the first cylindrical body 38 is positioned
The outer peripheral side primary coil 36 fixed to the first cylindrical body 38 is bonded to the annular plate 30, and the second cylindrical body 39 is bonded to the center pole 2.
7, the bonding area increases, and the outer circumferential side 1
The adhesive strength between the secondary coil 36 and the inner peripheral side primary coil 37 is improved.

It should be noted that the positioning portion 28 need only be formed with a step portion 29 on the bottom surface portion 26 of the yoke 2, and the positioning portion 28 can be easily formed.

The positioning portion 28 is formed as a step portion 29 protruding upward. Conversely, the positioning portion is formed as a concave portion opening upward and the first cylindrical member 38 is formed.
May be adhered to the peripheral surface of the concave portion. Further, the positioning portion may be formed as an annular groove, and the lower end of the first cylindrical body 38 may be inserted and fixed in the groove.

In the above description, the outer magnetic type electromagnetic induction speaker 22 is provided with the outer peripheral side primary coil 36 and the inner peripheral side primary coil 37 which are opposed to each other with the secondary coil 35 interposed therebetween. An outer-magnet-type electromagnetic induction speaker in which the primary coil is arranged only on one side of the outer periphery or the inner periphery of the secondary coil may be used.

Further, the outer magnetic type electromagnetic induction speaker 22 described above has the outer peripheral side primary coil 36 directly adhered to the annular plate 30.
May be fixed to the inner peripheral surface of the cylindrical body, and the upper end of the inner peripheral surface of the first cylindrical body may be directly bonded to the annular plate 30.

The specific shape and structure of each part shown in each of the above-described embodiments are merely examples of the embodiment for carrying out the present invention. The technical scope of the invention should not be construed as being limited.

[0094]

As is apparent from the above description, the speaker device of the present invention comprises a bobbin fixed to a diaphragm, a yoke in which a magnetic circuit is formed together with a magnet and a positioning portion is formed, And a secondary coil provided on the bobbin and disposed in the magnetic gap, wherein the primary coil is fixed to one end and the other end is disposed. Is provided with a tubular body attached to a positioning portion of the yoke.

Therefore, the positioning of the primary coil with respect to the yoke can be performed extremely easily, and there is no need to use a gap gauge, so that there is no danger of the gap gauge coming off the yoke or the like due to contact with the primary coil.

Also, the mounting area of the primary coil directly or via the cylindrical body is increased, and the mounting strength can be improved.

According to a second aspect of the present invention, there is provided an annular plate having a center hole, and a center member disposed inside the annular plate, wherein the magnetic gap is formed between the annular plate and the center member, The primary coil is
Between the annular plate and the secondary coil or between the center member and
It is characterized by being arranged between the next coil.

As described above, even if the primary coil is arranged only on one side of the secondary coil, the positioning of the primary coil with respect to the yoke can be performed very easily.

According to the third aspect of the present invention, an annular plate having a center hole and a center member arranged inside the annular plate are provided, and the magnetic gap is provided between the annular plate and the center member. Since the primary coil is formed and fixed to the inner peripheral surface of the annular plate via a tubular body or fixed to the outer peripheral surface of the center member via a tubular body,
The fixing operation becomes very easy, and there is no possibility that the primary coil contacts the annular plate or the center member to cause damage.

According to a fourth aspect of the present invention, there is provided an annular plate having a center hole, and a center member disposed inside the annular plate, wherein the magnetic gap is formed between the annular plate and the center member, The primary coil is
Between the annular plate and the secondary coil and between the center member and
It is characterized by being arranged between each of the following coils.

As described above, even when the primary coil is disposed with the secondary coil interposed therebetween, the positioning of the primary coil with respect to the yoke can be performed extremely easily.

According to the fifth aspect of the present invention, since the positioning portion provided on the yoke is formed as a step,
The positioning portion can be easily formed.

In the invention described in claim 6, since the positioning portion provided on the yoke is formed as an annular groove, it is extremely easy to form the positioning portion.

Further, since the cylindrical body can be fixed by being fitted into the groove, the mounting strength of the primary coil can be further improved.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing a first embodiment in which the speaker device of the present invention is applied to an internal magnet type electromagnetic induction speaker.

FIG. 2 is a schematic longitudinal sectional view showing an inner-magnet type electromagnetic induction speaker in which a primary coil is arranged only on one side of a secondary coil.

FIG. 3 is a schematic longitudinal sectional view showing an inner-magnet type electromagnetic induction speaker in which a first cylindrical body is directly fixed to an annular plate.

FIG. 4 is a schematic longitudinal sectional view showing an inner magnet type electromagnetic induction speaker in which a positioning portion is formed as a groove.

FIG. 5 is a schematic longitudinal sectional view showing a second embodiment in which the speaker device of the present invention is applied to an external-magnet-type electromagnetic induction speaker.

FIG. 6 is a schematic longitudinal sectional view showing a conventional inner magnet type electromagnetic induction speaker.

FIG. 7 is a schematic longitudinal sectional view showing a conventional external magnet type electromagnetic induction speaker.

[Explanation of symbols]

1 ... inner magnet type electromagnetic induction speaker (speaker device), 2
... Yoke, 3 ... Magnet, 4 ... Vibration plate, 7 ... Circular plate, 7a ... Center hole, 8 ... Positioning part, 9 ... First step (step), 10 ... Second step (step) , 12: Center plate (center member), 13: Magnetic gap, 14
... bobbin, 15 ... secondary coil, 16 ... outer peripheral side primary coil (primary coil), 17 ... inner peripheral side primary coil (primary coil), 18 ... first cylindrical body (cylindrical body), 19: second cylindrical body (cylindrical body), 1A: inner magnet type electromagnetic induction speaker (speaker device), 8A: positioning part, 10A: step part, 1
7A: primary coil, 19A: cylindrical body, 1B: internal magnetic type electromagnetic induction speaker (speaker device), 18A: first cylindrical body (cylindrical body), 1C: internal magnetic type electromagnetic induction speaker (speaker device) ), 8B: positioning portion, 20: first groove (groove), 21: second groove (groove), 22: external magnetic induction speaker (speaker device), 23: yoke, 24 ...
Magnet, 25: diaphragm, 27: center pole (center member), 28: positioning part, 29: step, 30 ...
Annular plate, 30a central hole, 32 magnetic gap,
34 ... bobbin, 35 ... secondary coil, 36 ... outer peripheral side primary coil (primary coil), 37 ... inner peripheral side primary coil (primary coil), 38 ... first cylindrical body (cylindrical body) , 39... Second cylindrical body (cylindrical body)

Claims (6)

[Claims] A bobbin fixed to a diaphragm; a yoke forming a magnetic circuit together with a magnet and having a positioning portion formed therein; a primary coil disposed in a magnetic gap to receive an audio signal; And a secondary coil disposed in the magnetic gap. A cylindrical body having one end fixed to the primary coil and the other end attached to a positioning portion of the yoke. Characteristic speaker device. 2. An annular plate having a center hole, and a center member disposed inside the annular plate, wherein the magnetic gap is formed between the annular plate and the center member, and wherein the primary coil has an annular shape. The speaker device according to claim 1, wherein the speaker device is disposed between the plate and the secondary coil or between the center member and the secondary coil. 3. An annular plate having a center hole, and a center member disposed inside the annular plate, wherein the magnetic gap is formed between the annular plate and the center member, and wherein the primary coil has an annular shape. 2. The speaker device according to claim 1, wherein the speaker device is fixed to an inner peripheral surface of the plate via a cylindrical member or is fixed to an outer peripheral surface of the center member via a cylindrical member. 3. 4. An annular plate having a center hole, and a center member disposed inside the annular plate, wherein the magnetic gap is formed between the annular plate and the center member, and wherein the primary coil has an annular shape. The speaker device according to claim 1, wherein the speaker device is disposed between the plate and the secondary coil and between the center member and the secondary coil. 5. The speaker device according to claim 1, wherein the positioning portion provided on the yoke is formed as a step. 6. The speaker device according to claim 1, wherein the positioning portion provided on the yoke is formed as an annular groove.