JP2001016685A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reproduction capability of a sound at a low frequency range of a speaker used for various sound devices. SOLUTION: This speaker is provided with a rib 1b whose cross-section has a U-shape on a coordinate face 1a of a frame 1 coupled with a magnetic circuit 2 formed with a magnetic gap 7. Thus, the speaker with an excellent reproduction capability at a low frequency band is provided by enhancing stiffness so as to suppress resonance with vibration of the speaker at reproduction of sound at a low frequency range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker used for various kinds of audio equipment.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIG. FIG. 13 is a half sectional view of the speaker.

According to FIG. 1, reference numeral 2 denotes an inner magnet type magnetic circuit composed of a pot-shaped yoke 3, a columnar magnet 4 and a columnar plate 5, and an upper surface of the magnetic circuit 2 has a frame. 1 are connected. Reference numeral 6 denotes a voice coil, and a suspension 16 is provided so that a lower portion of the voice coil 6 is fitted into the magnetic gap 7 of the magnetic circuit 2 without being eccentric.
Are connected to the voice coil 6 and the outer circumference is connected to the frame 1, and the suspension 16 supports the voice coil 6.

Reference numeral 8 denotes a diaphragm, the outer periphery of which is coupled to the frame 1 together with a gasket 9;
The inner peripheral portion of the diaphragm 8 is connected to the voice coil 6.

[0005] Reference numeral 10 denotes a dust cap coupled to the diaphragm 8, and 11 denotes lead wires at both ends of the voice coil 6, each eyelet 12 caulked on the surface of the diaphragm 8. The other end of the tinsel wire 13 is soldered to a terminal 15 of a connector 14 fixed to the frame 1.

The lead wire 11 extending to the voice coil 6 on the diaphragm 8 is bonded and fixed to the diaphragm 8 by applying an adhesive.

It is to be noted that the most common method of bonding described above is to use an adhesive.

The operation of the conventional loudspeaker configured as described above will be described below. First, when an input signal is applied to the voice coil 6 from the connector 14 through the terminal 15 and the tinsel wire 13, the voice coil 6 is driven according to Fleming's left-hand rule, and the diaphragm 8 is vibrated by the driving force. It emits sound into the air.

[0009]

However, in the above-mentioned conventional configuration, when a low-frequency signal is applied to the speaker, the area of the seating surface 1a of the frame 1 is relatively small, so that the rigidity is low and the frame 1 has a low rigidity. The bearing surface 1a, which is a coupling surface with the magnetic circuit 2, causes vibration and resonance of the speaker at the time of low-frequency reproduction, and has a problem that the reproduction performance in the low-frequency band is reduced.

There is also a method of reducing the outer diameter of the seating surface 1a of the frame 1 in order to solve the above problem.
In such a case, the outer diameter of the suspension 16 becomes smaller, so that the amplitude margin becomes smaller, and there is a similar problem that the reproduction capability of a low frequency band having a large amplitude is reduced.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a speaker which improves the reproduction capability of a low frequency band.

[0012]

In order to solve the above-mentioned problems, a speaker according to the present invention comprises a magnetic circuit having at least a magnetic gap, a frame provided with a rib at a connection portion with the magnetic circuit, and an inner periphery having the above-mentioned structure. It is composed of a diaphragm that is connected to a voice coil that fits into the magnetic gap and has an outer periphery that is connected to the frame.Ribs are provided to increase rigidity at the connection part, improve vibration suppression, and improve speaker performance. Even when a low-frequency signal is applied, the seating surface, which is the coupling surface with the magnetic circuit of the frame, suppresses the vibration and resonance of the speaker during low-frequency reproduction, and reproduces low-frequency frequencies. This makes it possible to provide an excellent speaker.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The speaker according to the present invention according to the first aspect of the present invention includes a magnetic circuit having at least a magnetic gap, a frame provided with a rib at a connection portion with the magnetic circuit, and an inner periphery having the magnetic gap. And a diaphragm whose outer periphery is connected to the frame and which is fitted to the voice coil. Has a function of preventing resonance with the vibration of the speaker at the time of low-frequency reproduction in which the speaker is likely to vibrate.

According to a second aspect of the present invention, the rib according to the first aspect is provided so as to extend from the seating surface of the frame to the magnetic circuit to the side surface of the frame, and the rib is provided to the side surface of the frame. Therefore, the present invention has the function of preventing resonance with the vibration of the speaker even during low-frequency reproduction in which the amplitude is larger than in claim 1 and the frame is likely to vibrate.

According to a third aspect of the present invention, the rib of the first aspect is an annular rib and has the same function.

According to a fourth aspect of the present invention, the rib of the first aspect is formed by providing a plurality of convex portions on the seating surface of the frame, and has the same operation as the first aspect. Processing can be easily performed.

According to a fifth aspect of the present invention, the rib according to the first aspect is provided on a circumference of a joining portion between a seating surface of the frame and a side surface of the frame, and the rib is connected to a magnetic circuit. Since it is provided so as to avoid the coupling portion, the strength of the adhesive coupling can be maintained in addition to the suppression of the resonance phenomenon in the low frequency region due to the improvement in rigidity.

An embodiment of the present invention will be described below with reference to FIGS.

The same parts as those in the prior art are given the same reference numerals, and the description thereof will be omitted, and only different points will be described.

(Embodiment 1) FIG. 1 is a half sectional view of an embodiment of the present invention, FIG. 2 is a perspective view of a cut model of a frame which is the main part, and FIG. 3 and FIG. It is a perspective view of the cut model of the example of deployment of the frame which is each the principal part. 1 is a frame, 2 is a magnetic circuit composed of a pot-shaped yoke 3, a columnar magnet 4, and a columnar plate 5, 6 is a voice coil fitted in a magnetic gap 7 of the magnetic circuit 2 without eccentric lower part. Reference numeral 8 denotes a vibration plate having a central portion coupled to the upper portion of the voice coil 6 and a peripheral portion coupled to a peripheral portion of the frame 1 together with a gasket 9. Reference numeral 10 denotes a dust cap attached to the upper surface of the central portion of the diaphragm 8.
Is a lead wire drawn out of the voice coil 6, 12 is an eyelet provided on the diaphragm 8 to which the lead wire 11 is connected, 13 is an eyelet 12 and a terminal 15 of a connector 14 provided on the frame 1.
A damper 16 holds the voice coil 6. Note that a description will be given of a frame 1 which is different from the related art.

Referring to FIG. 1, reference numeral 1b denotes a rib having a U-shaped cross section provided at a portion where the frame 1 and the magnetic circuit 2 of the inner magnet type are connected to the magnetic circuit 2 on the seating surface 1a of the frame 1. is there.

Even when a low frequency signal is applied to the speaker, the rib 1b increases the amplitude because the rigidity of the seating surface 1a, which is the coupling surface with the magnetic circuit 2 of the frame 1, is improved. Since the loudspeaker has an effect of suppressing resonance with vibration of the loudspeaker even at the time of low-frequency reproduction in which the loudspeaker is likely to vibrate, it is possible to provide a loudspeaker having excellent reproduction capability in a low frequency band.

3 and 4 are perspective views of a cut model of a frame in a developed example.
A rib 1c having a substantially V-shaped cross section is provided at a portion of the seat surface 1a connected to the magnetic circuit 2. Even if the rib 1c has a substantially triangular cross section, the rigidity of the seating surface 1a can be improved, and the amplitude of the rib 1c increases as in the frame of FIG. To suppress the resonance of the loudspeaker and provide a speaker having excellent reproduction capability in a low frequency band.

Reference numeral 1d denotes a rib having a concave cross section provided at a portion where the frame 1 is connected to the magnetic circuit 2 provided on the seating surface 1a.

The rib 1d may be a rib having a rectangular cross section. Like the ribs 1a and 1b, the amplitude of the rib 1d is large and the vibration of the speaker 1 is not affected by the vibration of the loudspeaker even during low-frequency reproduction where the frame 1 is likely to vibrate. An object of the present invention is to provide a speaker which suppresses resonance and has excellent reproduction capability in a low frequency band.

Since the ribs 1c and 1d have a relatively large surface area than the rib 1b, the heat radiation effect is superior to the rib 1b.

(Embodiment 2) FIG. 5 is a perspective view of a cut model of a main frame of another embodiment of the present invention, and FIGS. 6 and 7 are cuts of a main frame of the developed example. It is a perspective view of a model. Hereinafter, the frame 1 that is different from the related art will be described.

Referring to FIG. 1, reference numeral 1e denotes a rib having a U-shaped cross section provided to extend from the seating surface 1a of the frame 1 to be connected to the magnetic circuit 2 to the side surface of the frame 1.

As described above, since the rib 1e is provided from the seating surface 1a to the side surface of the frame 1, the rigidity is further improved as compared with the first embodiment, so that when a low frequency signal is applied to the speaker. However, it is possible to suppress the resonance with the vibration of the speaker at the time of low-frequency reproduction in which the amplitude becomes large and the frame 1 is likely to vibrate, and to provide a speaker excellent in reproduction performance in a lower frequency band.

Next, an example of development will be described with reference to FIG. 6. If 1f is provided extending from the seating surface 1a, which is similar to the rib 1e of FIG. The rib is formed in a substantially V-shaped cross section. With the above configuration, the frame 1 is formed in the same manner as the rib 1e.
The rigidity of the ribs can be improved, and the same effect can be obtained. In addition, since the surface area is relatively large, the heat radiation effect can be improved.
e is better than e.

The same effect can be obtained even if the cross section of the rib 1f has a substantially triangular cross section.

Next, a development example shown in FIG. 7 will be described. Reference numeral 1g denotes a seat surface 1a coupled to the magnetic circuit 2 of the frame 1.
And a rib having a rectangular cross section provided to extend from the side to the side surface of the frame 1, and has the same vibration damping effect and heat radiation effect as the rib 1f.

(Embodiment 3) FIG. 8 is a perspective view of a cut model of a main part of a frame according to another embodiment of the present invention. FIGS. It is a perspective view of a model.

The frame 1 that is different from the prior art will be described below.

Reference numeral 1h denotes an annular rib having a U-shaped cross section provided on the bearing surface 1a of the frame 1.

With the above configuration, the first embodiment
Similarly to the rib 1b, even when a low-frequency signal is applied to the speaker, the amplitude increases because the rigidity of the seating surface 1a, which is the coupling surface of the frame 1 with the magnetic circuit 2, is improved. 1 has an effect of preventing resonance with vibration of a speaker at the time of low-frequency reproduction in which vibration is liable to occur, so that it is possible to provide a speaker excellent in reproduction performance in a low-frequency band.

Since the rib 1h is formed in an annular shape, it is formed by pressing when the frame 1 is formed of a metal plate, but is formed on the bearing surface 1a over the entire circumference. Of the seating surface 1a
Has the advantage that a uniform state can be obtained, and the rib 1h is annular when formed by resin molding, so that it is easy to manufacture a molding die.

Reference numeral 1i denotes an annular rib similar to 1h and formed in a V-shaped cross section or a triangular cross section. Similarly, the rigidity is improved to suppress resonance in a low frequency band, and reproduce a low frequency band. It is possible to provide a speaker having excellent ability.

1j is also an annular rib similar to 1h and has a rectangular cross section and has the same effect as the rib 1i.

(Embodiment 4) FIG. 11 is a perspective view of a cut model of a main part of a frame according to another embodiment of the present invention.

1k is the same as in the first embodiment,
A plurality of hemispherical projections provided on the seating surface 1a of the frame 1, the rigidity of the seating surface 1a of the frame 1 is improved by the hemispherical ribs having a U-shaped cross section, the amplitude is increased, and the frame 1 vibrates. Since it has an effect of preventing resonance with vibration of the speaker at the time of easy low-frequency reproduction, it is possible to provide a speaker having excellent reproduction capability in a low-frequency band. The projections can be formed relatively easily in the case where the frame 1 is provided by pressing a metal plate or in the case where the frame 1 is formed by resin molding, and the same effect as in the first embodiment can be obtained.

(Embodiment 5) FIG. 12 is a perspective view of a cut model of a main frame according to another embodiment of the present invention.

Numeral 11 denotes a rib having a triangular cross section provided on the circumference of a portion where the seat surface 1a of the frame 1 connected to the magnetic circuit 2 and the side surface of the frame 1 are joined.

Similarly to the first embodiment, when a low-frequency signal is applied to the loudspeaker, the seat 11a, which is a coupling surface of the frame 1 with the magnetic circuit 2, is formed by the rib 11 as well.
Since the rigidity of the loudspeaker is improved, the amplitude increases, and the frame 1 has an action of controlling resonance with the vibration of the speaker at the time of low-frequency reproduction in which vibration is likely to occur. In addition, the rib 11 avoids the joint portion with the magnetic circuit, so that the adhesive connection between the magnetic circuit 2 and the frame 1 can maintain the conventional strength.

In the embodiment of the present invention, the magnetic circuit 2 is of the internal magnet type. However, various small magnetic circuits such as an external magnetic type using a ring-shaped magnet may be used. In the embodiment, the ribs are formed on the frame 1. However, the same effect can be obtained by connecting the ribs to the frame 1 as separate components.

[0046]

As described above, the loudspeaker according to the present invention comprises a magnetic circuit having at least a magnetic gap, a frame provided with a rib at a connecting portion with the magnetic circuit, and a voice coil whose inner periphery fits into the magnetic gap. And a diaphragm whose outer periphery is connected to the frame. A rib is provided to increase the rigidity at the connection, improve vibration damping, and apply a low-frequency signal to the speaker. Even if it is done, the bearing surface that is the coupling surface with the magnetic circuit of the frame,
An object of the present invention is to suppress the occurrence of vibration and resonance of a speaker during low-frequency reproduction, and to provide a speaker having excellent reproduction performance in a low-frequency band.

[Brief description of the drawings]

FIG. 1 is a half sectional view of an embodiment of a speaker according to the present invention.

FIG. 2 is a perspective view of a cut model of a frame, which is the main part.

FIG. 3 is a perspective view of a cut model of a frame of a main part of the developed example.

FIG. 4 is a perspective view of a cut model of a frame of a main part of the developed example.

FIG. 5 is a perspective view of a cut model of a main part frame according to the other embodiment.

FIG. 6 is a perspective view of a cut model of a frame of a main part of the developed example.

FIG. 7 is a perspective view of a cut model of a frame of a main part of the developed example.

FIG. 8 is a perspective view of a cut model of a frame of a main part according to another embodiment of the present invention.

FIG. 9 is a perspective view of a cut model of a frame of a main part of the developed example.

FIG. 10 is a perspective view of a cut model of a frame of a main part of the development example.

FIG. 11 is a perspective view of a cut model of a main part frame according to another embodiment of the present invention.

FIG. 12 is a perspective view of a cut model of a frame of a main part according to another embodiment of the present invention.

FIG. 13 is a half sectional view of a conventional speaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame 1a Seat 1b-1l Rib 2 Magnetic circuit 6 Voice coil 8 Diaphragm

Claims (5)

[Claims] 1. A magnetic circuit having at least a magnetic gap, a frame provided with a rib at a coupling portion with the magnetic circuit, an inner periphery coupled to a voice coil that fits into the magnetic gap, and an outer periphery coupled to the frame. Speaker comprising a vibrating plate. 2. The loudspeaker according to claim 1, wherein the rib is constituted by a frame provided from a seating surface of the frame to a magnetic circuit and a side surface of the frame. 3. The loudspeaker according to claim 1, wherein the rib provided on the frame comprises a frame provided with at least one annular rib having a U-shaped cross section. 4. The loudspeaker according to claim 1, wherein a plurality of substantially hemispherical projections are provided on the seat surface of the frame to form ribs. 5. A frame provided with at least one rib having a triangular cross-section on a circumference of a joint portion between a side surface of the frame and a coupling seat surface of the frame with a magnetic circuit of the frame. The speaker according to claim 1, wherein the speaker is configured by: