JP2000350284A - Loudspeaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tweeter of which the magnetic force is made large in a magnetic gap even with a magnet having a relatively small magnetic force. SOLUTION: This loudspeaker has a magnet 10, 1st and 2nd flat plate yokes 11a and 11b which are arranged abutting against the N pole and S pole of the magnet 10, 1st and 2nd plates 12a and 12b which are arranged in a manner that each of the one-side ends of both plates are fixed onto each of the top end faces of the 1st and 2nd flat plate yokes 11a and 11b and a thin and long magnetic gap 13 is formed between the other-side ends of both plates, and 1st and 2nd diaphragms 14 and 30 which have one-side ends 14a and 30a fixed onto the 1st and 2nd plates 12a and 12b and are provided with plane voice coils 15 and 31 inserted into the magnetic gap 13 on the other-side end.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to, for example, 100 kHz.
The present invention relates to a loudspeaker for high sounds that can be reproduced up to an extremely high frequency range up to z.

[0002]

2. Description of the Related Art Conventionally, as a loudspeaker for a high sound which can reproduce a very high frequency up to, for example, 100 kHz, FIG.
A ribbon-shaped speaker as shown in FIG. 10 has been proposed.

Referring to the ribbon-shaped speaker shown in FIGS. 9 and 10, reference numeral 1 denotes a rectangular magnet.
A plate-shaped yoke 2a having a predetermined shape is provided in contact with the N pole of the rectangular parallelepiped magnet 1 and a plate-shaped yoke 2b having the same shape as the plate yoke 2a in contact with the S pole of the magnet 1
Is provided.

One end of each of the rectangular plates 3a and 3b is fixed to the upper end surface of each of the plate-like yokes 2a and 2b, and a relatively wide predetermined length is provided between the other end surfaces of the plates 3a and 3b. Is formed.

A ribbon-shaped diaphragm 5 made of a conductive material, for example, an aluminum thin plate, is inserted into the magnetic gap 4, and one end of the ribbon-shaped diaphragm 5 is insulated and held at one end of the magnetic gap 4 by a holding member 6a. At the same time, it is connected to one input terminal 7a, the other end of the ribbon-shaped diaphragm 5 is insulated and held by the holding member 6b at the other end of the magnetic gap 4, and is connected to the other input terminal 7b.

The audio signal supplied to the audio signal input terminals 8a and 8b is supplied to one and the other input terminals 7a and 7b via a transformer (matching transformer) 9 for impedance conversion.

In a ribbon-type speaker as shown in FIGS. 9 and 10, when a current flows through the ribbon-type diaphragm 5 in response to an acoustic signal supplied between one and the other input terminals 7a and 7b. According to the framing left-hand rule, the diaphragm 5 vibrates to emit high-pitched sounds.

[0008]

However, in the ribbon-shaped speaker as shown in FIGS. 9 and 10, the width of the magnetic gap 4 necessary for moving the ribbon-shaped diaphragm 5 is very large. 4, in order to generate a large magnetic force, the magnet 1 having a very large magnetic force must be used.
The magnet 1 having such an extremely large magnetic force is disadvantageous in that it is difficult to manufacture and expensive.

In view of the above, the present invention proposes a loudspeaker for a high-pitched sound in which a magnet having a relatively small magnetic force can increase the magnetic force in a magnetic gap.

[0010]

According to the present invention, there is provided a loudspeaker comprising: a magnet; first and second flat yokes arranged in contact with an N pole and an S pole of the magnet; First and second plates having one end fixed to each upper end surface of the flat plate yoke and arranged so as to form an elongated magnetic gap between the other end surfaces thereof, and one end side of the first and second plates, respectively. And first and second diaphragms provided on the other end side with planar voice coils respectively inserted into the magnetic gaps at the other end.

According to the present invention, since only the planar voice coil provided on the diaphragm is inserted into the elongated magnetic gap, the gap width of the magnetic gap can be made very small, and the magnet has a relatively small magnetic force. However, the magnetic force of the magnetic gap can be extremely increased. According to the present invention,
Since the first and second diaphragms are provided, a sound radiation area can be increased.

Further, the speaker of the present invention comprises a magnet,
First and second plate yokes arranged in contact with the N and S poles of the magnet, and one end fixed to the upper end surface of each of the first and second plate yokes, and each of the other ends fixed. A first arrangement arranged to form an elongated magnetic gap between the end faces.
And the second plate, and the first and second plates
A first and a second diaphragm fixed on a plate and provided with a short-circuit conductor inserted into the magnetic gap at the other end, respectively, and provided along inner surfaces of the first and the second plates. And a drive coil.

According to the present invention, since the short-circuit conductor and the drive coil provided on the diaphragm are merely inserted into the elongated magnetic gap, the gap width of the magnetic gap can be made very small, and the magnetic gap can be made relatively small. Even if the magnet has the above-mentioned force, the magnetic force of the magnetic gap can be extremely increased. Also, according to the present invention, since the first and second diaphragms are provided, the sound radiation area can be increased.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a speaker according to the present invention will be described below with reference to FIGS. 1, 2 and 3. FIG.

1 and 3, reference numeral 10 denotes a ring-shaped magnet made of, for example, a ferrite magnet and having a predetermined thickness. The ring-shaped magnet 10 is brought into contact with the N-pole surface of the ring-shaped magnet 10 and has a predetermined rectangular plate-like yoke. 11a, and a plate yoke 11b having the same shape as the plate yoke 11a is provided in contact with the S pole surface of the magnet 10.

One end of each short side of each of the rectangular plates 12a and 12b is fixed to the upper end surface of each of the plate-like yokes 11a and 11b.
An elongated magnetic gap 13 is formed between the other end faces of the respective short sides of 2b.

In this case, the gap width of the elongated magnetic gap 13 is determined by a flat voice coil 1 made of, for example, an aluminum thin plate provided integrally with two diaphragms 14 and 30 to be described later.
5 and 31 are very thin. In this case, the magnetic force of the magnetic gap 13 can be extremely increased even if the magnetic force of the magnet 10 is relatively small.

In this embodiment, two rectangular diaphragms 1 are provided.
The bonded portions 14a and 30a on one side of the plates 4 and 30 are connected to the plates 12a and 1 via gaskets 16a and 16b.
2b. These two diaphragms 14 and 30
Are formed in a dome shape, and planar one-turn voice coils 15 and 31 are provided on the other side opposite to the bonding portions 14a and 30a, respectively. Insert it.

As shown in FIG. 2A, the vibrating plate 14 has a bonding portion 14 on one side of a rectangle made of synthetic resin.
a is linearly bonded to a gasket 16a, and the diaphragm 14 is formed in a dome shape, and a flat one-turn voice coil 15 is formed on the other side opposite to the bonding portion 14a.
Is provided. As shown in FIG. 2B, the diaphragm 30 is formed in a symmetrical shape with respect to the diaphragm 14, and a bonding portion 30a on one side of a rectangular shape made of synthetic resin is linearly adhered and fixed to the gasket 16b, and The plate 30 has a dome shape, and a flat one-turn voice coil 31 is provided on the other side opposite to the bonding portion 30a. In this example, the two planar voice coils 15 and 31 of the diaphragms 14 and 30 are attached to each other as shown in FIG.

In this case, when the diaphragms 14 and 30 are formed of synthetic resin, it is possible to form the aluminum thin plates forming the planar one-turn voice coils 15 and 31 integrally with an aluminum insert. . Input terminals 17 are provided at both ends of the voice coils 15 and 30, respectively.
a, 17b, 17c and 17d are provided to supply audio signals to the input terminals 17a and 17b and 17c and 17d, respectively.

In order to hold the planar one-turn voice coils 15 and 31 integrally provided on the vibrating plates 14 and 30, respectively, in the elongated magnetic gap 13, the viscosity in the magnetic gap 13 in the magnetic field is reduced. The magnetic fluid 18 is injected.

Since the present embodiment is constructed as described above, the magnetic flux from the N pole of the magnet 10 according to the present embodiment is N pole of the magnet 10, plate yoke 11a, plate 12a, magnetic gap 13, plate 12b, and plate. The yoke 11b flows through the magnetic circuit of the S pole of the magnet 10.

Therefore, when an acoustic signal is supplied between the input terminals 17a and 17b, 17c and 17d of the one-turn planar voice coils 15 and 31 of the diaphragms 14 and 30, respectively, the planar voice coil 15 A current corresponding to the acoustic signal flows through the diaphragms 31 and 31, and the diaphragms 14 and 30 vibrate according to the framing left-hand rule, thereby emitting high sounds.

According to this embodiment, the elongated magnetic air gap 13
Since only one-turn planar voice coils 15 and 31 made of, for example, an aluminum thin plate are inserted into the magnet 10, the gap width of the magnetic gap 13 can be made extremely small. , This magnetic air gap 1
3, the magnetic force can be made very large, and an inexpensive and high-quality high-frequency speaker can be obtained.

In this embodiment, since the two diaphragms 14 and 30 are used, the area from which sound is radiated is increased, and the sound pressure level can be increased.

As shown in FIG. 1, in a dynamic high-frequency loudspeaker using one-turn planar voice coils 15 and 31, the impedance of the voice coils 15 and 31 is very small. Uses a matching transformer, but when used in combination with the treble speaker 50 and the main speaker 51 as shown in FIG. 7, as shown in FIG. If the voice coil 15 (31) of the speaker 50 is connected, the matching transformer can be omitted.

That is, as shown in FIG. 5, the audio signal 20 is supplied to the voice coil 15 (31) of the speaker 50 of the present embodiment via a parallel circuit of the voice coil 21 of the all-range speaker 51 and the high-pass capacitor 22. I will do it.

In FIG. 7, 52 is a speaker box, 53 is a baffle plate, 54 is a duct, 54a is a duct opening, 55a to 55d are input terminals, and 56a to 56d are connection lines.

FIGS. 4, 5 and 6 show another embodiment of the speaker according to the present invention. 4 to 6, parts corresponding to FIG. 1 are denoted by the same reference numerals.

Also in this example, a predetermined rectangular plate-like yoke 11a is provided in contact with the N-pole surface of a ring-shaped magnet 10 having a predetermined thickness made of, for example, a ferrite magnet. A plate yoke 11b having the same shape as the plate yoke 11a is provided in contact with the plate yoke 11b.

One end of each short side of each of the rectangular plates 12a and 12b is fixed to the upper end surface of each of the plate-like yokes 11a and 11b.
An elongated magnetic air gap 13 is formed between the respective other end faces of 2b.

In this case, the gap width of the elongated magnetic gap 13 is set to a short-circuiting conductor portion 2 made of, for example, an aluminum thin plate provided integrally with two diaphragms 25 and 35 to be described later.
5a and 35a shall be inserted thin. In this case, the magnetic force of the magnetic gap 13 can be extremely increased even if the magnetic force of the magnet 10 is relatively small.

In this embodiment, the bonded portions 25b and 35b on one side of the rectangular diaphragms 25 and 35 made of a conductive thin plate, for example, an aluminum thin plate are connected to the gaskets 26a and 26b, respectively.
6b is fixed on the plates 12a and 12b by adhesion.

The diaphragm 25 made of, for example, an aluminum thin plate
And 35 are respectively dome-shaped, and
The short-circuit conductors 25a and 35a on the other side end opposite to 5b and 35b are inserted into the magnetic gap 13.

As shown in FIG. 5A, for example, as shown in FIG. 5A, a bonding portion 25b on one side of a rectangular aluminum thin plate is linearly bonded and fixed to a gasket 26a, and the vibration plate 25 is formed in a dome shape. The other end opposite to the portion 25b is referred to as a short-circuiting conductor portion 25a.
Further, as shown in FIG. 5B, the diaphragm 35
The bonding portion 35b on one side of a rectangular aluminum thin plate is linearly bonded and fixed to the gasket 26b, and the diaphragm 35 is formed in a dome shape, and the other side facing the bonding portion 35b is formed. The end on the side is referred to as a short-circuiting conductor portion 35a. In this example, the short-circuit conductors 25a and 35a of the two diaphragms 25 and 35 are attached to each other as shown in FIG. 5B and inserted into the magnetic gap 13.

In this embodiment, the elongated openings along the other side, which are unnecessary portions for the ultrahigh frequency reproduction of the diaphragms 25 and 35 above the short-circuiting conductor portions 25a and 35a, are removed. 25c and 35c are provided. A thin film of a synthetic resin may be provided in the elongated openings 25c and 35c. In this case, the short-circuit current flows along the outer periphery of the elongated openings 25c and 35c.

In this embodiment, the drive coil 27 is wound along the respective inner surfaces of the magnetic gaps 13 of the plates 12a and 12b, and the drive coils 27 are bonded and fixed. As the electric wire of the drive coil 27, a wire made of a magnetic material may be used in order to easily pass a magnetic flux.
In this example, an audio signal is supplied to the drive coil 27.

In order to hold the short-circuiting conductor portions 25a and 35a on the other side of the vibration plates 25 and 35 in the elongated magnetic gap 13, the magnetic fluid 18 having viscosity in a magnetic field is formed in the magnetic gap 13. To be injected.

Since the present embodiment is constructed as described above, the magnetic flux from the N pole of the magnet 10 according to the present embodiment is N pole of the magnet 10, plate yoke 11a, plate 12a, magnetic gap 13, plate 12b, and plate. The yoke 11b flows through the magnetic circuit of the S pole of the magnet 10.

Therefore, when an acoustic signal is supplied to the drive coil 27, the short-circuit conductor 2
Short-circuit currents corresponding to the acoustic signals flow through the openings 5c and 35c in the holes 5a and 35a, whereby the diaphragms 25 and 35 vibrate in accordance with the acoustic signals, and can emit high-pitched sounds.

According to this embodiment, the elongated magnetic air gap (in this case, the drive coil 27 is also a magnetic material and forms a part of the plate) 13 is used for short-circuiting the diaphragms 25 and 35, which are, for example, aluminum thin plates. Since only the conductors 25a and 35a are inserted, the gap width of the magnetic gap 13 can be made very small, and the inexpensive magnet 10 having a relatively small magnetic force can be used.
Even in this case, the magnetic force of the magnetic gap 13 can be made extremely large, and an inexpensive and high-quality speaker for high sound can be obtained.

In this embodiment, the two diaphragms 25
And 35, the area for radiating sound is increased, and the sound pressure level can be increased.

As shown in FIGS. 4 to 6, the impedance of the drive coil 27 is relatively large in the electromagnetic induction type treble speaker, so that no matching transformer is required.

It is to be noted that the present invention is not limited to the above-described example, but may adopt various other configurations without departing from the gist of the present invention.

[0045]

According to the present invention, the gap width of the magnetic gap can be made very small, and even if an inexpensive magnet having a relatively small magnetic force is used, the magnetic force of this magnetic gap can be made very large. It is possible to obtain an inexpensive and high-quality loudspeaker for high sound.

According to the present invention, since the first and second diaphragms are provided, the area of sound radiation can be increased.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an embodiment of a speaker of the present invention.

FIG. 2 is a perspective view showing an example of the diaphragm shown in FIG.

FIG. 3 is a sectional view of the example of FIG. 1;

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

FIG. 5 is a perspective view showing an example of the diaphragm shown in FIG. 4;

FIG. 6 is a sectional view of the example of FIG. 4;

FIG. 7 is a sectional view showing an example of use of the speaker of FIG. 1;

FIG. 8 is a diagram provided for explaining FIG. 1;

FIG. 9 is a plan view showing an example of a conventional ribbon-shaped speaker.

FIG. 10 is a sectional view of FIG. 9;

[Explanation of symbols]

10 ° magnet, 11a, 11b plate yoke,
12a, 12b {plate, 13} magnetic air gap, 1
4, 25, 30, 35 {diaphragm, 15, 31} planar voice coil, 17a, 17b, 17c, 17d
Input terminal, 18 ° magnetic fluid, 25a, 35a conductor for short circuit, 27 ° drive coil

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kenji Tokushige 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F-term (reference) 5D012 AA03 BA01 BB05 CA02 5D016 AA08 FA04

Claims (2)

[Claims] 1. A magnet, first and second flat yokes disposed in contact with N and S poles of the magnet, respectively, and upper end faces of the first and second flat yokes, respectively. A first and a second plate fixed at one end thereof and arranged so as to form an elongated magnetic gap between the other end surfaces thereof; and one end side fixed to the first and second plates respectively and the other end thereof. A speaker comprising: first and second diaphragms each provided with a planar voice coil inserted into the magnetic gap on the side thereof. 2. A magnet, first and second flat yokes disposed in contact with N and S poles of the magnet, respectively, and upper end faces of the first and second flat yokes, respectively. A first and a second plate fixed at one end thereof and arranged so as to form an elongated magnetic gap between the other end surfaces thereof; and one end side fixed to the first and second plates respectively and the other end thereof. The first and second diaphragms are provided with short-circuit conductors to be inserted into the magnetic gaps on the sides thereof, respectively, and a drive coil is provided along inner surfaces of the first and second plates. Speaker.