JP2000175294A - Speaker and speaker system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic shield type speaker with a simple configuration where a magnetic force in a magnetic gap to drive a diaphragm is enhanced. SOLUTION: The speaker has a pot type yoke 20 with a center pole 20a, a ring magnet 21 placed on a bottom 20b of the pot type yoke 20, a 1st plate 22 that is placed on the ring magnet 21 so as to form a 1st magnetic gap 23 between the inner circumferential face and an outer circumferential face of the center pole 20a, and a 2nd plate 24 that is placed on an upper end face of the pot type yoke 20 to form a 2nd magnetic gap 25 between the inner circumferential face and the outer circumferential face of the center pole 20a. The 1st magnetic gap 23 is used to drive a diaphragm 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker suitable for being applied to a small speaker and a speaker device using the speaker.

[0002]

2. Description of the Related Art Conventionally, small speakers as shown in FIG. 9 have been proposed. As shown in FIG. 9, the loudspeaker includes a ring-shaped magnet 1 having north and south poles magnetized in a vertical direction, a ring-shaped plate 2 and a center pole 3a mounted so as to sandwich the ring-shaped magnet 1. A yoke 3 integrally formed with a flange 3b is provided, and a magnetic gap 4 is formed between the inner peripheral surface of the plate 2 and the outer peripheral surface of the center pole 3a of the yoke 3.

A frame 5 of a speaker is mounted on the plate 2, and an edge 7 is provided on an outer peripheral portion of the diaphragm 6. The outer peripheral portion of the cone-shaped diaphragm 6 is held by the frame 5 by the edge 7. ing. 8 is a gasket.

On the other hand, a voice coil bobbin 9 is mounted on the inner peripheral portion of the diaphragm 6, and a voice coil 10 is wound around the voice coil bobbin 9.
Are inserted into a magnetic gap 4 formed by the center pole 3a of the plate 2 and the yoke 3.

[0005] In FIG. 9, reference numeral 11 denotes a damper for holding the voice coil 10 in the magnetic gap 4. As the damper 11, for example, a spiral damper obtained by impregnating a cloth with a synthetic resin is used.

Reference numeral 12 denotes an input terminal. An audio signal from the input terminal 12 is supplied to the voice coil 10 through a tinsel wire 13. Reference numeral 14 denotes a cap for covering the upper surface of the voice coil bobbin 9 for preventing dust from entering.

As shown in FIG. 9, in a speaker, a ring-shaped magnet 1 → a plate 2 → a magnetic air gap 4 →
The magnetic circuit of the center pole 3a of the yoke 3 → the flange 3b → the ring-shaped magnet 1 is formed. Since the plate 2 and the yoke 3 have different polarities, as shown in FIG. Leakage magnetic flux, in which a magnetic flux flows directly, is generated, and there is an inconvenience that only about 1/3 of the magnetic force of the ring-shaped magnet 1 is used.

As a speaker which eliminates such a leakage magnetic flux, a speaker using a cancel magnet as shown in FIG. 10 has been proposed. In the description of FIG. 10, parts corresponding to those in FIG.

In FIG. 10, a ring-shaped cancel magnet 15 magnetized in a direction opposite to the main drive ring-shaped magnet 1 is mounted near the outer periphery of the lower surface of the flange 3b of the yoke 3 in FIG. Therefore, a shield cover 16 having a bottomed cylindrical shape is attached so as to cover the cancel magnet 15 so as to eliminate magnetic flux leakage.
Otherwise, the configuration is the same as that of FIG.

[0010]

In such a speaker as shown in FIG. 10, in order to use a magnetic shield type,
It is necessary to provide a cancel magnet 15, magnetize the cancel magnet 15 in a polarity opposite to that of the main ring magnet 1, adhere the magnet to the rear surface of the main ring magnet 1, and provide a magnetic shield cover 16. As this magnetic circuit becomes larger, the magnetic force (magnetic flux) of the magnetic gap 4 for driving the diaphragm 6 of the magnetic shield type speaker does not increase so much, for example, increases by only about 10% and the magnetic force of the cancel magnet 15. Is not used for driving the diaphragm 6 at all.

In view of the above, the present invention provides a speaker of a magnetic shield type with a simple configuration and increases the magnetic force (magnetic flux) of a magnetic gap for driving a diaphragm, and uses the speaker. The proposed speaker device is proposed.

[0012]

A speaker according to the present invention comprises a pot-shaped yoke having a center pole, a ring-shaped magnet provided on the bottom of the pot-shaped yoke, an inner peripheral surface on the ring-shaped magnet, and a center. A first plate arranged so as to form a first magnetic gap between the outer peripheral surface of the pole and a second magnetic plate between the inner peripheral surface and the outer peripheral surface of the center pole on the upper end surface of the pot-shaped yoke; It has a second plate arranged so as to form an air gap, and the diaphragm is driven by the first magnetic air gap.

According to the present invention, the magnetic flux from the N pole of the ring magnet forms a magnetic circuit which returns to the S pole of the ring magnet through the pot-shaped yoke and the first and second plates. A magnetic shield type speaker can be obtained with a simple configuration that does not require a cancel magnet or the like.

According to the present invention, the diaphragm is driven by the first magnetic gap in which the leakage magnetic flux is reduced and the magnetic flux is concentrated. Therefore, the magnetic force for driving the diaphragm is increased, The sensitivity and the sound quality are improved, and the resonance sharpness Q at the lowest resonance frequency of the bass sound of the speaker can be reduced, and a speaker device that can expand the bass reproduction band when a small speaker box is used can be obtained.

Further, the speaker of the present invention has a pot-shaped yoke having a center pole, and a first magnetic gap formed between an inner peripheral face and an outer peripheral face of the center pole on an upper end face of the pot-shaped yoke. A first plate disposed, a ring-shaped magnet disposed on a lower surface of the first plate, and a second magnetic gap formed between an inner peripheral surface and an outer peripheral surface of the center pole on the lower surface of the ring-shaped magnet. And a second plate arranged as described above, and the diaphragm is driven by the second magnetic gap.

According to the present invention, the magnetic flux from the N pole of the ring magnet passes through the pot-shaped yoke and the first and second plates and returns to the S pole of the ring magnet. Therefore, a magnetic shield type speaker can be obtained with a simple configuration that does not require a cancel magnet or the like.

Further, according to the present invention, the diaphragm is driven by the second magnetic gap in which the leakage magnetic flux is small and the magnetic flux is concentrated. Therefore, the magnetic force for driving the diaphragm is increased, and the sensitivity is increased. And the sound quality is improved, and the resonance sharpness Q at the lowest resonance frequency of the bass of the speaker can be reduced,
It is possible to obtain a speaker device capable of expanding a bass reproduction band when a small speaker box is used.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the speaker according to the present invention will be described below with reference to FIG. In FIG. 1, parts corresponding to those in FIG. 9 are denoted by the same reference numerals.

In the example of FIG. 1, the center pole 20a
Ring-shaped magnet 2 having N-poles and S-poles vertically magnetized on a bottom 20b of a pot-shaped yoke 20 integrally formed with
1 is bonded and fixed such that the S pole is in contact with the bottom 20b of the pot-shaped yoke 20. In this case, the center pole 20a penetrates the ring-shaped magnet 21 and the ring-shaped magnet 21 is positioned by a magnet guide 20d provided on the bottom 20b of the pot-shaped yoke 20.

A ring-shaped plate 22 is adhesively fixed on the N pole of the ring-shaped magnet 21 and a magnetic gap 23 is formed between the inner peripheral surface of the plate 22 and the outer peripheral surface of the center pole 20a.

In this embodiment, the outer peripheral edge of the plate 24 is adhesively fixed on the circular upper end surface of the pot-shaped yoke 20, and a magnetic gap is formed between the inner peripheral surface of the plate 24 and the outer peripheral surface of the center pole 20a. 25 is formed.

A speaker frame 5 is mounted on the upper surface of the plate 24.
The outer peripheral portion of the cone-shaped diaphragm 6 provided with is provided with a gasket 8.

On the other hand, a voice coil bobbin 9 is mounted on the inner peripheral portion of the diaphragm 6, and a voice coil 10 is wound around the voice coil bobbin 9. In this embodiment, the voice coil 10 is inserted into a magnetic gap 23. I do.

In this embodiment, the ring-shaped magnet 21
From the N pole of the ring-shaped magnet 21 →
Plate 22 → Magnetic gap 23 → Center pole 20a →
The bottom 20b of the pot-shaped yoke 20 → the ring-shaped magnet 21
S-pole magnetic circuit and N-pole of ring-shaped magnet 21 →
Plate 22 → Magnetic gap 23 → Center pole 20a →
Magnetic gap 25 → plate 24 → side wall 2 of pot-shaped yoke 20
0c → the bottom 20b → the magnetic circuit of the S-pole of the 21 ring-shaped magnets.

Accordingly, the magnetic flux of the ring-shaped magnet 21 intensively flows through the magnetic gap 23, and the magnetic force (magnetic flux) of the magnetic gap 23 is increased.

The voice coil 10 is held in the magnetic gap 23 by the damper 11. This damper 1
For example, a spiral damper in which cloth is impregnated with a synthetic resin is used as 1. Further, a cap 14 for preventing dust from entering is provided so as to cover the upper surface of the voice coil bobbin 9.
In addition, an audio signal from an input terminal 12 provided at a predetermined position of the frame 5 is supplied to the voice coil 10 via a tinsel wire 13.

Since the present embodiment is constructed as described above, the magnetic flux from the N pole of the ring-shaped magnet 21 is generated by the pot-shaped yoke 20 having the center pole 20a and the two plates 2
A magnetic circuit that returns to the S pole of the ring-shaped magnet 21 through 2 and 24 is formed, and a magnetic shield type speaker can be obtained with a simple configuration that does not require a cancel magnet and a magnetic shield cover.

According to the present embodiment, the voice coil 10 for driving the diaphragm 6 is driven by the magnetic gap 23 in which the leakage magnetic flux is reduced and the magnetic flux of the ring-shaped magnet 21 is concentrated. The magnetic force of the magnetic gap 23 that drives the loudspeaker 10 increases, sensitivity and sound quality are improved, and the resonance sharpness Q at the lowest resonance frequency of the bass of the speaker can be reduced, and bass reproduction when a small speaker box is used. A loudspeaker device capable of expanding the band can be obtained.

2 to 7 show other examples of the embodiment of the speaker of the present invention. In describing FIGS. 2 to 7, portions corresponding to FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the example of FIG. 2, the outer diameter of the plate 22 is made larger than the outer diameter of the plate 22 of FIG. 1 in the example of FIG. A magnetic gap 26 is formed between the peripheral surface and the outer peripheral surface. The example of FIG. 2 is otherwise the same as the example of FIG.

In the example shown in FIG.
The magnetic flux from the N pole of No. 1 is different from the magnetic circuit of FIG.
N pole of ring magnet 21 → plate 22 → magnetic gap 26 → side wall 20 c of pot-shaped yoke 20 → bottom 20 b → magnetic circuit of S pole of ring magnet 21 and N pole of ring magnet 21 → plate 22 → magnetism Air gap 26 → side wall 20c of pot-shaped yoke 20 → plate 24 → magnetic air gap 2
5 → Center pole 20a → Bottom 20 of pot-shaped yoke 20
b → flows through the magnetic circuit of the S pole of the ring-shaped magnet 21.

It can be easily understood that the same operation and effect as in the example of FIG. 1 can be obtained in the example of FIG.

In the example of FIG. 3, a ring-shaped magnet 21 having N and S poles vertically magnetized is formed on a bottom 20b of a pot-shaped yoke 20 integrally formed with a center pole 20a. The yoke 20 is adhered and fixed on the bottom portion 20b of the yoke 20.

A ring-shaped plate 22 is bonded and fixed on the N pole of the ring-shaped magnet 21 and a magnetic gap 23 is formed between the inner peripheral surface of the plate 22 and the outer peripheral surface of the center pole 20a.

In the example shown in FIG. 3, a columnar magnet 27 having N and S poles vertically magnetized on the center pole 20a is bonded and fixed such that the S pole contacts the center pole 20a. And this columnar magnet 27
The pole piece 28 is adhesively fixed on the N pole. In this case, the ring magnet 21 and the columnar magnet 27 are magnetized in the same direction.

In the example of FIG. 3, the outer peripheral edge of the plate 24 is adhesively fixed on the circular upper end surface of the pot-shaped yoke 20, and the inner peripheral surface of the plate 24 and the outer peripheral surface of the pole piece 28 are fixed. The magnetic air gap 25 is formed between them. In the example of FIG. 3, the rest is configured in the same way as the example of FIG.

The magnetic flux from the N pole of the ring magnet 21 of the speaker in the example of FIG. 3 is N pole of the ring magnet 21 → plate 22 → magnetic gap 23 → center pole 2.
0a → bottom 20b of pot-shaped yoke 20 → magnetic circuit of S-pole of ring-shaped magnet 21 and N-pole of ring-shaped magnet 21 → plate 22 → magnetic gap 23 → center pole 2
0a → S pole of cylindrical magnet 27 → N pole → pole piece 28 → magnetic air gap 25 → plate 24 → pot-shaped yoke 20
, The bottom 20b, and the magnetic circuit of the S pole of the ring-shaped magnet 21 (in this magnetic circuit, the magnetic flux of the columnar magnet 27 is added).

In the example of FIG. 3, the N pole of the columnar magnet 27 → the pole piece 28 → the magnetic gap 25 → the plate 24 → the side wall 20c of the pot-shaped yoke 20 → the bottom 20b.
→ Center pole 20a → S-pole magnetic circuit of columnar magnet 27 is formed.

In the example of FIG. 3, the magnetic force of the magnetic gap 23 is increased by the provision of the columnar magnet 27 as compared with the example of FIG. It can be easily understood that the same effect as that of the example of FIG. 1 can be obtained in the example of FIG.

FIG. 4 shows an example in which the outer peripheral edge of a ring-shaped plate 24 is bonded and fixed on the circular upper end surface of a pot-shaped yoke 20 having a center pole 20a at the center and the inner peripheral surface of the plate 24. The magnetic gap 25 is formed between the magnetic pole 25 and the outer peripheral surface of the center pole 20a.

A ring-shaped magnet 30 having N and S poles vertically magnetized on the lower surface of the plate 24 is bonded and fixed such that the N pole contacts the lower surface of the plate 24.
In this case, the center pole 20a penetrates the ring-shaped magnet 30.

A ring-shaped plate 31 is adhered and fixed to the lower surface of the south pole of the ring-shaped magnet 30, and a magnetic gap 32 is formed between the inner peripheral surface of the plate 31 and the outer peripheral surface of the center pole 20a. .

In the example shown in FIG. 4, the voice coil 10 for driving the diaphragm 6 is inserted into the magnetic gap 32. In the example of FIG. 4, the rest is configured in the same way as the example of FIG.

In the example of FIG. 4, the magnetic flux from the N pole of the ring magnet 30 is N pole of the ring magnet 30 → the plate 24 → the magnetic gap 25 → the center pole 2.
0a → magnetic gap 32 → plate 31 → magnetic circuit of S pole of ring magnet 30 and N pole of ring magnet 30 → plate 24 → side wall 20c of pot-shaped yoke 20 → bottom 20b → center pole 20a → magnetic gap 32 → plate 31 → flows through the magnetic circuit of the S pole of the ring-shaped magnet 30.

Therefore, the magnetic flux of the ring-shaped magnet 30 intensively flows through the magnetic gap 32, and the magnetic force (magnetic flux) of the magnetic gap 32 is increased.

Therefore, also in the example of FIG. 4, the magnetic flux from the N pole of the ring-shaped magnet 30
Pot-shaped yoke 20 with 0a, two plates 24,3
A magnetic circuit that returns to the S pole of the ring-shaped magnet 30 through 1 and forms a magnetic shield type speaker with a simple configuration that does not require a cancel magnet and a magnetic shield cover can be obtained.

According to the example of FIG. 4, the voice coil 1 for driving the diaphragm 6 is reduced by the magnetic gap 32 in which the leakage magnetic flux is reduced and the magnetic flux of the ring-shaped magnet 30 is concentrated.
0, so that the voice coil 1
The magnetic force of the magnetic gap 32 driving the zero increases, the sensitivity and the sound quality are improved, and the resonance sharpness Q at the lowest resonance frequency of the low frequency of the speaker can be reduced, and the reproduction of the low frequency when a small speaker box is used. A loudspeaker device capable of expanding the band can be obtained.

In the example shown in FIG. 5, the outer diameter of the plate 31 is made larger than the outer diameter of the plate 31 shown in FIG.
A magnetic gap 33 is formed between the inner peripheral surface of the magnetic head c and the inner peripheral surface of the magnetic head c. The example of FIG. 5 is otherwise the same as the example of FIG.

In the example shown in FIG.
The magnetic flux from the N-pole of the ring-shaped magnet 30 as well as the N-pole of the ring-shaped magnet 30 → the plate 24 → the side wall 20c of the pot-shaped yoke 20 → the magnetic gap 33 → the plate 31 → the ring-shaped magnet 30 S pole magnetic circuit and N pole of ring magnet 30 → plate 24 → magnetic gap 25 → center pole 20 a → bottom 20 b of pot-shaped yoke 20 → side wall 20 c → magnetic gap 33 → plate 31 → S of ring magnet 30 Flow through the magnetic circuit of the pole.

It can be easily understood that the same effect as that of the example of FIG. 4 can be obtained in the example of FIG.

FIG. 6 shows an example of a bottom portion 34 of a pot-shaped yoke 34.
A columnar magnet 35 having N-poles and S-poles magnetized in the up-down direction is bonded and fixed to the central portion on the bottom portion 34a such that the S-pole contacts the bottom portion 34a. N of this cylindrical magnet 35
A relatively long pole piece 36 is adhesively fixed on the very top.

In the example shown in FIG. 6, the outer peripheral edge of the ring-shaped plate 24 is adhesively fixed on the circular upper end surface of the pot-shaped yoke 34 and the inner peripheral surface of the plate 24 and the outer periphery of the pole piece 36 are fixed. A magnetic gap 25 is formed between the surface and the surface.

A ring-shaped magnet 30 having N-poles and S-poles vertically magnetized on the lower surface of the plate 24 is bonded and fixed such that the N-pole contacts the lower surface of the plate 24.
In this case, the magnetization directions of the N pole and the S pole of the columnar magnet 34 and the ring magnet 30 are set to be the same.

A ring-shaped plate 31 is bonded and fixed to the lower surface of the S-pole of the ring-shaped magnet 30, and a magnetic gap 32 is formed between the inner peripheral surface of the plate 31 and the outer peripheral surface of the pole piece 36. . The example of FIG. 6 is configured similarly to the example of FIG.

The N of the ring-shaped magnet 30 shown in FIG.
The magnetic flux from the pole is determined by the N pole of the ring-shaped magnet 30, the plate 24, the magnetic gap 25, the pole piece 36, the magnetic gap 32, the plate 31, the magnetic circuit of the S pole of the ring magnet 30, and the N of the ring magnet 30. Pole → plate 24 → side wall 34b of pot-shaped yoke 34 → bottom 34a → S pole of cylindrical magnet 35 → N pole → pole piece 36 → magnetic gap 32 → plate 31 → magnetic circuit of S pole of ring-shaped magnet 30 In the magnetic circuit, the magnetic flux of the columnar magnet 35 is added.).

Further, in the example of FIG. 6, the N pole of the cylindrical magnet 35 → the pole piece 36 → the magnetic gap 25 →
Plate 24 → side wall 34b of pot-shaped yoke 34 → bottom 34
a → S-pole magnetic circuit of the columnar magnet 35 is formed. In the example of FIG. 6, a magnetic flux in the same direction flows through the magnetic gap 32, and the magnetic force of the magnetic gap 32 is stronger than the magnetic force of the magnetic gap 25.

In the example of FIG. 6, the magnetic force of the magnetic gap 32 is increased by the provision of the columnar magnet 35, as compared with the example of FIG. It can be easily understood that the same operation and effect as in the example of FIG. 4 can be obtained in the example of FIG.

FIG. 7 shows the cylindrical magnet 3 of FIG.
A columnar magnet 37 whose magnetization direction is reversed is provided, and the voice coil 10 for driving the diaphragm 6 is inserted into the magnetic gap 25.

That is, a columnar magnet 37 having N-poles and S-poles magnetized in the vertical direction is bonded and fixed to the center of the bottom 34a of the pot-shaped yoke 34 so that the N-pole contacts the bottom 34a. . Also, a relatively long pole piece 36 is bonded and fixed on the S pole of the columnar magnet 37.

In the example of FIG. 7, the voice coil 10 for driving the diaphragm 6 of the speaker is inserted into the magnetic gap 25, and the voice coil 1 is
0 is driven. The example of FIG. 7 is otherwise the same as the example of FIG.

In the example shown in FIG. 7, the magnetic flux from the N pole of the ring-shaped magnet 30 is changed from the N pole of the ring-shaped magnet 30 → the plate 24 → the magnetic gap 25 → the pole piece 36.
→ Magnetic gap 32 → Plate 31 → Ring magnet 3
0 flows through the magnetic circuit of the S pole, and the columnar magnet 37
The magnetic flux from the N pole of the plate magnet is the N pole of the columnar magnet 37 → the bottom 34a of the pot-shaped yoke 34 → the side wall 34b → the plate 24.
→ magnetic gap 25 → pole piece 36 → flows through the magnetic circuit of the S pole of cylindrical magnet 37.

Accordingly, the magnetic flux from the ring magnet 30 and the columnar magnet 37 flows in the magnetic gap 25 in the same direction, and the magnetic force of the magnetic gap 25 becomes stronger than the magnetic force of the magnetic gap 32.

It can be easily understood that the same effect as that of the example of FIG. 4 can be obtained in the example of FIG.

FIG. 8 shows an example of a speaker device in which the speaker of FIG. 1 is mounted on a small speaker box 40. Referring to FIG. 8, in FIG. 8, reference numeral 40 denotes a small speaker box.
A speaker as shown in the example of FIG. 1 is fixed to a speaker sound emission hole 41a formed in a baffle plate 41 provided on the front surface of the speaker.

An audio signal from an input terminal 42 provided at a predetermined position outside the speaker box 40 is supplied to the input terminal 12 of the speaker via a connection line 43, and the audio signal from the input terminal 12 is supplied to a tinsel. The power is supplied to the voice coil 10 via the line 13.

The baffle plate 41 has a speaker sound hole 4.
A duct 44 having an opening 44a on the same surface as 1a;
The phase of the sound emitted from the rear surface of the diaphragm 6 of the speaker is inverted and radiated from the duct 44 to the outside of the speaker box 40 so as to widen the bass range of the sound emitted from the front surface of the diaphragm 6. The example in FIG. 8 constitutes a phase inversion type speaker device.

In the speaker device according to the present embodiment, since the magnetic force for driving the diaphragm 6 of the speaker is strong as described above, the sensitivity and sound quality of the speaker device are improved, and the resonance sharpness at the lowest resonance frequency of the bass of the speaker is improved. It is possible to obtain a speaker device capable of reducing Q and expanding a low-frequency sound reproduction band when the small speaker box 40 is used.

The loudspeakers of FIGS. 2 to 7 according to the above example may be mounted on a small speaker box 40 as in the example of FIG. 8 to obtain a loudspeaker device. In this case, it can be easily understood that the same operation and effect as in the example of FIG. 8 can be obtained.

In the above example, the pot-shaped yoke having the center pole is integrally formed. However, the center pole is formed by combining the yoke integrally formed with the flange and the center pole and the ring-shaped yoke forming the side wall. A pot-shaped yoke may be used.

Further, the present invention is not limited to the above-described example, and may adopt various other configurations without departing from the gist of the present invention.

[0071]

According to the present invention, the magnetic flux from the north pole of the ring magnet passes through the pot-shaped yoke and the first and second plates to return to the south pole of the ring magnet. However, a magnetic shield type speaker can be obtained with a simple configuration that does not require a cancel magnet or the like.

Further, according to the present invention, the diaphragm is driven by the magnetic gap in which the leakage magnetic flux is reduced and the magnetic flux is concentrated. Therefore, the magnetic force for driving the diaphragm is increased, and the sensitivity and the sensitivity are increased. The sound quality is improved and the resonance sharpness Q at the lowest resonance frequency of the bass of the speaker can be reduced,
It is possible to obtain a speaker device that can expand a bass reproduction band when a small speaker box is used.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an example of an embodiment of a speaker of the present invention.

FIG. 2 is a sectional view showing another example of the embodiment of the present invention.

FIG. 3 is a sectional view showing another example of the embodiment of the present invention.

FIG. 4 is a sectional view showing another example of the embodiment of the present invention.

FIG. 5 is a sectional view showing another example of the embodiment of the present invention.

FIG. 6 is a sectional view showing another example of the embodiment of the present invention.

FIG. 7 is a sectional view showing another example of the embodiment of the present invention.

FIG. 8 is a sectional view showing an example of an embodiment of the speaker device of the present invention.

FIG. 9 is a cross-sectional view illustrating an example of a conventional speaker.

FIG. 10 is a cross-sectional view illustrating an example of a conventional speaker.

[Explanation of symbols]

5 ‥‥ frame, 6 ‥‥ diaphragm, 10 ‥‥ voice coil, 20,34 ‥‥ pot-shaped yoke, 20a ‥‥ center pole, 20b, 34a ‥‥ bottom, 20c, 34b ‥‥ side wall, 21, 30 ‥ ‥ Ring magnets, 22, 24,
31 ‥‥ plate, 23, 25 ‥‥ magnetic air gap, 40 ‥‥
Speaker box, 41 mm baffle plate

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Takayuki Mizuuchi 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F-term (reference) 5D012 BB03 BB04 BB05 BB09 FA02 FA08

Claims (8)

[Claims] 1. A pot-shaped yoke having a center pole,
A ring-shaped magnet arranged on the bottom of the pot-shaped yoke,
A first plate disposed on the ring-shaped magnet so as to form a first magnetic gap between an inner peripheral surface and an outer peripheral surface of the center pole; and an inner peripheral surface on an upper end surface of the pot-shaped yoke. A loudspeaker comprising a second plate disposed so as to form a second magnetic gap between the outer peripheral surface of a center pole and a diaphragm, the diaphragm being driven by the first magnetic gap. 2. The speaker according to claim 1, wherein a third magnetic gap is formed between an outer peripheral surface of the first plate and an inner peripheral surface of a side wall of the pot-shaped yoke. 3. A pot-shaped yoke having a center pole,
A ring-shaped magnet arranged on the bottom of the pot-shaped yoke,
A first plate disposed on the ring-shaped magnet so as to form a first magnetic gap between an inner peripheral surface and an outer peripheral surface of the center pole; and a same direction as the ring-shaped magnet disposed on the center pole. , A pole piece disposed on the columnar magnet, and a second magnetic gap between an inner peripheral surface and an outer peripheral surface of the pole piece on an upper end surface of the pot-shaped yoke. And a second plate disposed so as to form a diaphragm, and wherein the diaphragm is driven by the first magnetic gap. 4. A pot-shaped yoke having a center pole,
A first plate disposed on an upper end surface of the pot-shaped yoke so as to form a first magnetic gap between an inner peripheral surface and an outer peripheral surface of the center pole; and a ring disposed on a lower surface of the first plate. And a second plate disposed on the lower surface of the ring-shaped magnet so as to form a second magnetic gap between an inner peripheral surface and an outer peripheral surface of the center pole. A speaker characterized in that a diaphragm is driven. 5. The speaker according to claim 4, wherein a third magnetic gap is formed between an outer peripheral surface of the second plate and an inner peripheral surface of a side wall of the pot-shaped yoke. 6. A pot-shaped yoke, a columnar magnet disposed at a central portion on the bottom of the pot-shaped yoke, a pole piece disposed on the columnar magnet, and an inner part disposed on an upper end surface of the pot-shaped yoke. A first plate disposed so as to form a first magnetic gap between a peripheral surface and an outer peripheral surface of the pole piece;
A ring-shaped magnet magnetized in the same direction as the columnar magnet disposed on the lower surface of the plate, and a second magnetic gap formed between the inner peripheral surface and the outer peripheral surface of the pole piece on the lower surface of the ring-shaped magnet. And a second plate arranged in such a manner that the diaphragm is driven by a magnetic gap having a strong magnetic force among the first and second magnetic gaps. 7. The speaker according to claim 6, wherein the cylindrical magnet and the ring magnet are magnetized in opposite directions. 8. A speaker device having a speaker attached to a baffle plate at the front of a speaker box, wherein the speaker is a speaker device.
A speaker device according to any one of the preceding claims.