JPH11187484A - Loudspeaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slender loudspeaker for use in various video devices which has improved characteristics in low frequency reproduction and in transient behavior as well as high input withstanding performance. SOLUTION: This loudspeaker is provided with a diaphragm 10 and a damper 12, that are coupled respectively with an upper coil 8a and a lower coil 8 nearly in the middle inserted to a magnetic circuit 5, having an upper magnetic gap 4a and a lower magnetic gap 4b the magnetic flux directions of which are opposite to each other to enhance low sound frequency reproduction and input withstanding performance, and then split resonance hardly takes place.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A conventional speaker will be described with reference to a sectional view of FIG. In the figure, a plate 1 formed in a disk shape
3 is provided with a magnetic gap 15 in which a gap of a certain distance is continuous with the inner periphery of the yoke 14 in a circular shape.
A magnetic circuit 17 through which a magnetic flux 16 radially penetrates is formed together with a magnet 18.

[0003] Reference numeral 19 denotes a bobbin portion 20 formed of at least a cylindrical shape with a voice coil, and a coil portion 21 wound along the outer periphery of the bobbin portion 20 and inserted into the magnetic gap 15. The outer peripheral portion is coupled to the inner periphery of a damper 25 coupled to the frame 23 while the outer periphery is coupled to the inner periphery of a diaphragm 24 coupled to the frame 23 via the edge 22, and the coil portion 21 is positioned at an appropriate position of the magnetic gap 15. It is supported to be inserted into.

In the loudspeaker configured as described above, when a voice current flows through the coil portion 21 of the voice coil 19, the voice coil 19 vibrates up and down according to the direction of the voice current.
The diaphragm 24 connected to the voice coil 19 also vibrates in the same manner and is radiated to the outside as sound waves. 26 is a dustproof cap.

[0005]

However, the above-mentioned loudspeaker has the following disadvantages. (1) When the outer diameter or the width is reduced, the magnetic circuit 1
7 is also reduced, which causes a reduction in the efficiency of voice reproduction. (2) When the outer diameter or the width is reduced, the width of the damper 25 and the edge portion 22 is also reduced, so that the stiffness of the vibration system is increased, the minimum resonance frequency f0 is increased, and it becomes difficult to reproduce the low frequency range, and the amplitude at the time of large input is reduced. I can't follow. (3) If the width is narrowed and the shape of the diaphragm 24 is also elongated, the driving force is transmitted only to the central portion of the diaphragm 24, so that a split resonance in the long axis direction occurs, and a peak occurs in the frequency characteristic of the reproduced sound pressure.・ Dip occurs and sound quality deteriorates. (4) Since the driving force generated in the coil portion 21 of the voice coil 19 is once transmitted to the bobbin portion 20 and then propagated to the diaphragm 24, a transmission loss occurs in the bobbin portion 20, resulting in poor transient characteristics. There was a problem that.

The present invention has been made to solve the above-mentioned problems, and a speaker having excellent reproduction sound pressure frequency characteristics and transient characteristics which can improve efficiency and input resistance even in an elongated shape having a small diameter and a narrow width. To provide.

[0007]

In order to solve the above-mentioned problems, a speaker according to the present invention comprises a voice coil in which coils are inserted in two upper and lower parallel magnetic gaps having different magnetic flux directions, and a substantially center of the voice coil. The diaphragm is connected to the upper portion and the outer periphery is connected to the frame or the magnetic circuit, and the substantially center is formed by the damper connected to the lower portion of the voice coil and the outer periphery is connected to the frame or the magnetic circuit. It is possible to provide a speaker having an improved reproduction sound pressure frequency and an improved reproduction sound pressure frequency with a low minimum resonance frequency f0 set even if the structure has a narrow width and a narrow structure.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, two yokes connected to a set of magnets are opposed to each other, and the directions of magnetic fluxes between the respective yokes and the magnets are opposite to each other. A magnetic circuit having two upper and lower parallel magnetic gaps, a frame coupled to the magnetic circuit, a voice coil having a coil inserted in the magnetic gap of the magnetic circuit, and a substantially center coupled to an upper portion of the voice coil. A diaphragm whose outer periphery is connected to the frame or the magnetic circuit and a damper whose center is connected to a lower portion of the voice coil and whose outer periphery is connected to the frame or the magnetic circuit have a small diameter and a small width. Even in the case of a slender structure, the amplitude of the support system can follow a large input, and the lowest resonance frequency f0 is set low to achieve flatness at the reproduced sound pressure frequency.

According to a second aspect of the present invention, there is provided a magnetic circuit according to the first aspect, wherein two yokes which are connected to a magnet face each other, and a magnetic flux is applied between the yokes and the magnets. It is configured as a magnetic circuit having two upper and lower parallel magnetic gaps in opposite directions, and performs the same function as the speaker according to the first aspect.

According to a third aspect of the present invention, there is provided a magnetic circuit according to the first aspect, wherein a yoke coupled to a magnet and another yoke are opposed to each other, and the yokes and the yokes are mutually connected. It is configured as a magnetic circuit having two upper and lower parallel magnetic gaps opposite to each other in the direction of the magnetic flux, so that the number of parts can be reduced as compared with the speaker according to claim 1 and the same function as in claim 1 is provided at a lower cost. To fulfill.

According to a fourth aspect of the present invention, only an edge for connecting the outer periphery to a frame or a magnetic circuit is provided on the outer periphery of the upper coil of the voice coil directly without using the diaphragm according to the first, second or third aspect. The configuration is such that sound waves are radiated from the voice coil to the outside to reduce transmission loss.

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

(Embodiment 1) FIG. 1 is a cross-sectional view of a speaker according to an embodiment of the present invention, FIG. 2 is a perspective view of a magnetic circuit which is the main part, and FIG. FIG. 2 is a perspective view of a voice coil.

According to FIG. 1, reference numeral 1a denotes a magnet and a yoke 2
a. Also, the magnet 1b and the yoke 2b are connected in the same manner, and the upper magnetic gap 4 is provided between the respective yokes and the magnet so that the magnetic flux 3 penetrates in opposite directions.
a and a lower magnetic gap 4b are provided to form a magnetic circuit 5 composed of two sets of yokes and magnets as a whole and connected to a frame 6. The voice coil 7 is wound around the center 9 so that the upper coil 8a and the lower coil 8b can be inserted into the upper magnetic gap 4a and the lower magnetic gap 4b, respectively. Reference numeral 10 denotes a diaphragm which is coupled to the upper coil 8a at substantially the center and is coupled to the frame 6 at the outer periphery via the edge portion 11, and 12 is coupled to the lower coil 8b at substantially the center and coupled to the magnetic circuit 5 at the outer periphery. It is a damper.

The operation of the loudspeaker configured as described above will be described with reference to FIG. First, when a voice current flows through the upper coil portion 8a and the lower coil portion 8b disposed in the upper magnetic gap 4a and the lower magnetic gap 4b, respectively, the voice coil 7 vibrates according to the direction of the voice current. Sound waves are radiated to the outside through the connected diaphragm 10.

With the above configuration, the width of the damper 12 and the outer edge portion 11 of the diaphragm 10 can be made larger than in the prior art even if the speaker has a small diameter or an elongated structure with a narrow width. Is small and can withstand a large input amplitude, and the vibration energy of the upper coil 8a can be transmitted to the vibration plate 10 uniformly and directly to the vibration plate 10.

As described above, according to the present embodiment, the area of the edge 11 and the damper 12 of the diaphragm 10 can be maximized, and the vibration energy of the voice coil 7 can be made more uniform so that the vibration Since the power is transmitted, it is possible to realize the supply of a speaker having a high input resistance, low sound reproduction, and excellent flatness of sound pressure frequency characteristics.

In the above embodiment, the description has been made assuming that the diaphragm 10 is coupled to the frame 6.
The damper 12 may be connected to the frame 6.

(Embodiment 2) Another embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 4 is a sectional view of another embodiment of the present invention. According to the figure, the difference from the first embodiment is that the magnet 1
The position b is that an upper magnetic gap 4a is provided between the magnet 1a and the magnet 1b, and the operation is the same as that of the first embodiment.

(Embodiment 3) Another embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 5 is a sectional view of another embodiment of the present invention. According to the figure, the difference from the first embodiment is that the magnet 1
b, the upper magnetic gap 4a and the lower magnetic gap 4b are formed without the provision of the first embodiment.
It performs the same operation as.

(Embodiment 4) Another embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 6 is a sectional view of another embodiment of the present invention. According to the figure, the difference from the first embodiment is that an edge portion 11 for connecting the outer periphery to the frame 6 or the magnetic circuit 5 is provided on the outer periphery of the upper coil 8a of the voice coil 7 without providing the diaphragm 10, and the upper coil 8a is provided. The structure is such that sound waves are radiated directly from the outside to the outside, and the transmission loss in the diaphragm 10 is eliminated to improve the transient characteristics.

[0025]

As described above, the loudspeaker according to the present invention comprises a magnetic circuit having two upper and lower parallel magnetic gaps having opposite magnetic flux directions, a frame connected to the magnetic circuit, and a voice coil substantially at the center. The diaphragm is connected to the upper part and the outer periphery is connected to the frame or magnetic circuit, and the center is connected to the lower part of the voice coil and the outer periphery is connected to the frame or the magnetic circuit. Even with a narrow slender structure, the edge around the diaphragm and the area of the damper are maximized, the stiffness of the entire vibration system is reduced, the lowest resonance frequency f0 is lowered, and the amplitude at the time of large input can be followed. Since the vibration energy is more uniformly transmitted directly to the diaphragm, it is possible to improve the input resistance, the low-frequency sound reproduction, and the sound pressure frequency characteristic.

[Brief description of the drawings]

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

FIG. 2 is a perspective view of a magnetic circuit which is a main part of the same.

FIG. 3 is a perspective view of a voice coil which is a main part of the same.

FIG. 4 is a cross-sectional view of a speaker according to another embodiment.

FIG. 5 is a sectional view of a speaker according to another embodiment.

FIG. 6 is a cross-sectional view of a speaker according to another embodiment.

FIG. 7 is a sectional view of a conventional speaker.

[Explanation of symbols]

 1a, 1b magnet 2a, 2b yoke 3 magnetic flux 4a upper magnetic gap 4b lower magnetic gap 5 magnetic circuit 6 frame 7 voice coil 8a upper coil 8b lower coil 9 center 10 diaphragm 11 edge 12 damper

Claims (4)

[Claims] 1. A magnetic circuit comprising two yokes coupled to at least one set of magnets facing each other, and two upper and lower parallel magnetic gaps having opposite magnetic flux directions between the respective yokes and the magnets. A frame coupled to the magnetic circuit, a voice coil having a coil inserted into a magnetic gap of the magnetic circuit, and a diaphragm having a substantially center coupled to an upper portion of the voice coil and an outer periphery coupled to the frame or the magnetic circuit. And a damper having a substantially center coupled to a lower portion of the voice coil and an outer periphery coupled to the frame or the magnetic circuit. 2. A magnetic circuit comprising two yokes coupled to a magnet, facing each other, a yoke and a yoke of each other, and a magnetic circuit for providing two upper and lower parallel magnetic gaps between the magnets and having opposite magnetic flux directions. Item 7. The speaker according to Item 1. 3. A magnetic circuit in which a yoke coupled to a magnet and another yoke are opposed to each other, and two upper and lower parallel magnetic gaps whose magnetic flux directions are opposite to each other are formed between the yoke and the yoke. The speaker according to claim 1, wherein 4. The loudspeaker according to claim 1, wherein an edge for connecting the outer circumference to a frame or a magnetic circuit is provided on the outer circumference of the upper coil of the voice coil so that sound waves are radiated directly from the voice coil to the outside without using a diaphragm. .