JPH1155785A - Speaker device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the sensitivity of a speaker and to improve sound quality by enlarging the magnetic force of a small speaker device. SOLUTION: A thin disk-like magnet 20 magnetized in the same direction as a ring-like magnet 2 is fixed on the center pole 1a of a yoke 1 by adhesive and the like. A disk-like magnetic sheet 21 is fixed on the thin disk-like magnet 20 by adhesive. The magnetic flux of the magnet 20 is concentrated on the magnetic sheet 21 provided on the thin disk-like magnet 20. The magnetic sheet 21 and a plate 3 have the same poles. Leaking magnetic flux from the plate 3 is suppressed by magnetic flux from the magnetic sheet 21 and the density of magnetic flux flowing to the center pole 1a from the plate 3 through a magnetic gap 4 increases. The use efficiency of energy which the magnet 2 has increases and the magnetic force of the magnetic gap 4 can increase by not less than 25%. The magnetic force of the small speaker device can be enlarged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, a dynamic speaker device as shown in FIG. 3 has been proposed as a small speaker device.
Referring to FIG. 3, reference numeral 1 in FIG. 3 denotes a columnar center pole 1a which is made of a magnetic material and which is erected at the center of a disk, and which surrounds the center pole 1a concentrically. Guide 1 with step formed
b shows a yoke having an inverted T-shaped cross section in which the yoke 1 is integrated.
Further, a ring-shaped magnet 2 magnetized in the thickness direction in a ring shape is provided, and a ring-shaped plate 3 is provided on the upper surface of the magnet 2 with an adhesive or the like. These form a magnetic circuit (a so-called external magnet type magnetic circuit).

In this case, the center pole 1a of the yoke 1
A concentric magnetic air gap 4 is formed between the magnetic coil 4 and the inner periphery of the plate 3, and a voice coil 6 a wound around a voice coil bobbin 6 for vibrating the diaphragm 5 is arranged in the magnetic air gap 4. A funnel-shaped frame 7 made of steel or the like is fixed on the plate 3. An edge 8 is provided on an outer peripheral portion of the frame 7, and the outer peripheral portion of the cone-shaped diaphragm 5 is held by the edge 8.

On the other hand, the upper end of the voice coil bobbin 6 is attached to the inner peripheral portion of the diaphragm 5, and the voice coil 6a wound around the voice coil bobbin 6 is inserted into the magnetic gap 4, and the voice coil 6a The diaphragm 5 is made to vibrate. A corrugated damper 9 having a corrugated shape is bonded between the upper end of the outer periphery of the voice coil bobbin 6 and the bottom surface of the frame 7 with an adhesive or the like, and the voice coil 6 a is held in the magnetic gap 4 by the damper 9. I will do it.

A lead wire is pulled out from the voice coil 6a, and a terminal 1 provided on
1 so that the audio signal obtained at the terminal 11 is supplied to the voice coil 6a. Also, a dustproof cap 12 is provided on the upper surface of the voice coil bobbin 6.

[0006]

The problem to be solved by the present invention is shown in FIG.
In a small-sized speaker device, the magnetic flux that vibrates the voice coil 6a in the magnetic gap 4 has a relatively large amount of leakage magnetic flux and is about 30% of the energy of the magnet 2,
In addition, since the magnet 2 cannot be increased in a small speaker, the magnetic force of the magnetic gap 4 that vibrates the voice coil 6a cannot be increased, the sensitivity cannot be sufficiently increased, and good sound quality can be obtained. There was an inconvenience that I could not do.

Therefore, it is conceivable to dispose a ring-shaped thin plate magnet 13 magnetized in the same direction as the ring-shaped magnet 2 so as to surround the voice coil bobbin 6 on the bottom surface of the frame 7 as shown in FIG. In this case, the magnetic flux leaking from the ring-shaped thin plate magnet 13 is large and the magnetic force of the magnetic gap 4 is slightly increased, so that the sensitivity cannot be sufficiently increased and good sound quality cannot be obtained. Was.

In view of the foregoing, it is an object of the present invention to increase the magnetic force of a small speaker device, thereby improving the sensitivity and sound quality of the speaker. I do.

[0009]

A speaker device according to the present invention comprises a yoke having a center pole, a ring-shaped magnet, and a ring-shaped plate disposed on the ring-shaped magnet. In a speaker device in which a magnetic gap is formed between a peripheral wall and a center pole of the yoke, and a voice coil that vibrates a diaphragm is held in the magnetic gap, the speaker magnet is mounted on the center pole in the same direction as the ring-shaped magnet. And a thin magnetic plate provided on the thin magnet.

According to the present invention, the magnetic thin plate and the plate provided on the thin magnet have the same polarity, and the magnetic flux leaking from the plate is suppressed by the magnetic flux from the magnetic thin plate. The density of the magnetic flux flowing through the magnetic gap increases, the efficiency of using the energy of the magnet increases, and the magnetic force of the magnetic gap increases.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a speaker device according to the present invention will be described below with reference to FIG. In FIG. 1, portions corresponding to FIG. 3 are denoted by the same reference numerals.

In FIG. 1, a yoke 1 is made of a magnetic material and has a columnar center pole 1a planted in a disk-shaped center portion. A step portion is formed so as to concentrically surround the center pole 1a. The formed magnet guide 1b has an inverted T-shaped cross section in which it is integrated.

An inner diameter is fitted to and joined to the magnet guide 1b of the yoke 1 to provide a ring-shaped magnet 2 which is magnetized in the thickness direction. The yoke 1, the magnet 2 and the plate 3 constitute a magnetic circuit (a so-called external magnetic circuit).

As the magnet 2, for example, a neodymium plastic magnet is used. This neodymium plastic magnet has stronger magnetism than a ferrite magnet and can be easily formed into any shape.

In this case, the center pole 1a of the yoke 1
A concentric magnetic air gap 4 is formed between the magnetic coil 4 and the inner periphery of the plate 3, and a voice coil 6 a wound around a voice coil bobbin 6 for vibrating the diaphragm 5 is arranged in the magnetic air gap 4.

In this embodiment, a thin disk-shaped magnet 20 magnetized in the same direction as the ring-shaped magnet 2 is fixed on the center pole 1a of the yoke 1 with an adhesive or the like, and the thin disk-shaped magnet 20 is fixed. A disk-shaped magnetic thin plate 21 is fixed on the top 20 by an adhesive or the like.

In this case, the magnetic flux of the magnet 20 is concentrated on the magnetic thin plate 21 provided on the thin disk-shaped magnet 20, and the magnetic thin plate 21 and the plate 3 have the same polarity. The leakage magnetic flux is suppressed by the magnetic flux from the magnetic thin plate 21, the density of the magnetic flux flowing through the magnetic gap 4 to the center pole 1a from the plate 3 is increased, and the energy utilization efficiency of the magnet 2 is reduced. The magnetic force of the magnetic gap 4 has increased by 25% or more as compared with the prior art.

A funnel-shaped frame 7 made of steel or the like is fixed on the plate 3. The outer peripheral portion of the cone-shaped diaphragm 5 having the edge 8 is bonded and fixed to the outer peripheral flange portion of the frame 7 via the gasket 14.

On the other hand, the inner peripheral portion of the diaphragm 5 is fixed to the upper end of the outer periphery of the voice coil bobbin 6 with an adhesive or the like, and the voice coil 6a wound around the lower end of the voice coil bobbin 6 is provided in the magnetic gap 4. And the vibration coil 5 is vibrated by the voice coil 6a.

A concentric damper 9 having a corrugated shape is bonded between an underside of the fixed portion of the inner peripheral portion of the diaphragm 5 on the outer periphery of the voice coil bobbin and an outer peripheral portion of the bottom surface of the frame 7 with an adhesive or the like. The voice coil 6 a is held in the magnetic gap 4 by the damper 9.

A lead wire is pulled out from the voice coil 6a, and a terminal 11 provided on the frame 7 via a tinsel wire 10.
And the audio signal obtained at the terminal 11 is supplied to the voice coil 6a. In addition, a dustproof cap 12 is provided on the upper surface of the voice coil bobbin 6.

In this embodiment, as described above, a thin disk-shaped magnet 20 magnetized in the same direction as the ring-shaped magnet 2 is provided on the center pole 1a of the yoke 1, and the thin disk-shaped magnet 20 is provided. Since only the magnetic thin plate 21 is provided on the upper side, the outer shape is not so large as compared with the conventional case, and the magnetic flux of the magnet 20 is concentrated on the magnetic thin plate 21 provided on the thin disk-shaped magnet 20. The body thin plate 21 and the plate 3 have the same polarity, and the leakage magnetic flux from the plate 3 is suppressed by the magnetic flux from the magnetic thin plate 21, and flows to the center pole 1 a from the plate 3 via the magnetic gap 4. The magnetic flux density is increased, the efficiency of using the energy of the magnet 2 is increased, and the magnetic force of the magnetic gap 4 is reduced by 25% as compared with the related art.
As described above, it is possible to increase the magnetic force of the small speaker device, thereby improving the sensitivity of the speaker and improving the sound quality.

FIG. 2 shows another example of the present invention. In describing the example of FIG. 2, portions corresponding to those of FIG.

In FIG. 2, reference numeral 22 denotes a columnar magnet magnetized in the vertical direction, and a disk-shaped pole piece 23 is fixed on the columnar magnet 22 with an adhesive or the like. Further, a yoke 24 having a plate portion 24a having a shape surrounding the cylindrical magnet 22 is provided, and the cylindrical magnet 22, the pole piece 23 and the yoke 2 are provided.
4 constitutes a magnetic circuit (inner magnetic circuit).

In this case, the pole piece 23 and the yoke 24
A concentric magnetic air gap 4 is formed between the inner circumference of the plate portion 24a and a voice coil 6a wound around a voice coil bobbin 6 for vibrating the diaphragm 5 in the magnetic air gap 4.

In this embodiment, as shown in FIG. 2, a thin ring-shaped magnet 2 magnetized in the same direction as the columnar magnet 22 is provided inside the plate portion 24a of the yoke 24.
5 is fixed with an adhesive or the like, and a ring-shaped magnetic thin plate 26 is fixed on the thin ring-shaped magnet 25 with an adhesive or the like.

In this case, the ring-shaped magnet 25 is attached to a magnetic thin plate 26 provided on the thin ring-shaped magnet 25.
The magnetic thin plate 26 and the pole piece 2
3 has the same polarity, and the magnetic flux leaking from the pole piece 23 is suppressed by the magnetic flux from the magnetic thin plate 26, and the magnetic flux leaks from the pole piece 23 to the plate portion 24 a of the yoke 24 through the magnetic gap 4. The flowing magnetic flux density increases, the energy use efficiency of the cylindrical magnet 22 increases, and the magnetic force of the magnetic gap 4 increases.

The plate portion 24a of the yoke 24
A funnel-shaped frame 7 made of steel or the like is fixed to the upper outer peripheral side.
Other configurations are the same as in the example of FIG.

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

It should be noted that 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.

[0031]

According to the present invention, since the energy of the magnet can be used efficiently and the magnetic force in the magnetic gap can be increased without increasing the outer shape, the sensitivity of a small speaker can be improved. In addition, there is an advantage that sound quality can be improved.

[Brief description of the drawings]

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

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

FIG. 3 is a cross-sectional view illustrating an example of a conventional speaker device.

FIG. 4 is a cross-sectional view illustrating an example of a speaker device.

[Explanation of symbols]

1,24 ‥‥ yoke, 1a ‥‥ center pole, 2 ‥‥
Ring magnet, 3 ‥‥ plate, 4 ‥‥ magnetic gap, 5 ‥‥ diaphragm, 6 ‥‥ voice coil bobbin, 6a ‥
{Voice coil, 7} Frame, 8} Edge, 9}
{Damper, 20} Thin disk-shaped magnet, 21, 22
6 ‥‥ Magnetic thin plate, 22 ‥‥ cylindrical magnet, 23 ‥
{Pole piece, 24a} Plate part, 25} Thin ring-shaped magnet

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akihiro Akihiro 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo In-house Sony Corporation (72) Inventor Naoki Watanabe 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo In-house Sony Corporation (72) Inventor Kenji Tokushige 6-35 Kita Shinagawa, Shinagawa-ku, Tokyo In-house Sony Corporation

Claims (2)

[Claims] 1. A magnetic circuit comprising a yoke having a center pole, a ring-shaped magnet, and a ring-shaped plate disposed on the ring-shaped magnet, and a magnetic circuit formed between an inner peripheral wall of the ring-shaped plate and a center pole of the yoke. In a speaker device having a magnetic gap formed therein and holding a voice coil for vibrating a diaphragm in the magnetic gap, a thin magnet magnetized in the same direction as the ring-shaped magnet is provided on the center pole. A speaker device comprising a thin magnetic plate provided on the thin magnet. 2. A magnetic circuit comprising a columnar magnet, a yoke having a plate portion surrounding the columnar magnet, and a pole piece disposed on the columnar magnet, and a plate portion of the yoke and the pole piece. In the speaker device, a magnetic gap is formed between the magnets, and a voice coil that vibrates the diaphragm is held in the magnetic gap. A thin magnet that is magnetized on the plate portion of the yoke in the same direction as the columnar magnet. A speaker device comprising: a ring-shaped magnet; and a ring-shaped magnetic thin plate provided on the thin ring-shaped magnet.