JPH11205897A - Loudspeaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a loudspeaker that is applied to various elecctroacoustic transducers and has superior acoustic characteristic. SOLUTION: A magnetic gap 20 of a magnetic circuit of this loudspeaker is shaped rectangular and an outer shape of the magnetic circuit is shaped rectangular, and a frame 17, a voice coil 21, a damper 22, a diaphragm 23 and a neck part of a dust cap 24 are al shaped rectangular. Thus, even when a speaker of elliptical type, track type or the like having a different ratio of major diameter to minor diameter is manufactured, or when a speaker restricted in its shape such as space or diameter size, or a speaker with determined size is manufactured, the structure is freely formed without sacrificing an output sound pressure level, a high magnetic flux density is maintained to earn a sufficient output sound pressure level, and a slim and compact shape having provision for any condition and an extended high frequency characteristic are realized with excellent acoustic performance.

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 In recent years, digital signal processing technology has dramatically advanced, and the quality of electric signals supplied to speakers has been greatly improved. Accordingly, development of speakers capable of reproducing high sound quality has been strongly desired. ing.

A conventional speaker will be described with reference to FIGS. FIG. 6 is a cross-sectional view showing a cross section viewed from the long and short diameter sides of the above-described conventional speaker, and FIG. 7 is a plan view of a circular magnetic circuit which is the main part. In the figure, 1 is a bottom plate having a center pole, 2 is a ring-shaped main magnet fixed to the bottom plate 1, and 3 is a top plate fixed to the upper surface of the magnet 2. 4 is the bottom plate 1
And a frame coupled to a circular magnetic circuit formed by a ring-shaped main magnet 2 and a top plate 3.

[0004] Reference numeral 5 denotes a ring-shaped cancel magnet fixed to the lower surface of the bottom plate 1 by being magnetized in a direction opposite to that of the main magnet 2, and 6 is a shield cover for covering the entire circular magnetic circuit.

Reference numeral 7 denotes a voice coil held in a magnetic gap formed by the inner circumference of the top plate 3 and the outer circumference of the center pole of the bottom plate 1. Reference numeral 8 denotes an elliptical damper fixed to the voice coil 7. Reference numeral 9 denotes an elliptical diaphragm fixed to the tip of the voice coil 7. 10
Is a dust cap attached to the upper surface of the center of the diaphragm 9.

[0006] a is the major diameter side vertical angle indicating the angle of the portion where the diaphragm 9 and the voice coil 7 are attached. Reference numeral 11 denotes a circular magnetic gap of the magnetic circuit. Numeral 12 denotes a major axis ratio of the circular magnetic circuit, numeral 13 denotes a minor axis ratio of the circular magnetic circuit, and the ratio of the major axis to the minor axis is 1: 1 in this speaker.

The operation of the conventional speaker configured as described above will be described below. First, when an electric signal is applied to the voice coil 7 of the speaker, a driving force is generated in the magnetic circuit.

This driving force is transmitted to the voice coil 7,
The elliptical diaphragm 9 fixed to the tip is vibrated to emit a sound corresponding to the vibration. In order to further reduce the magnetic influence to the outside, the magnetism is blocked by the cancel magnet 5 and the shield cover 6.

Further, in order to increase the sound radiated by the vibration, the size of a circular magnetic circuit composed of the main magnet 2, the cancel magnet 5, and the like is increased to obtain an output sound pressure level. Also, in order to extend the high-frequency reproduction limit of the sound pressure frequency characteristic, the angle formed at the portion where the diaphragm 9 and the voice coil 7 are attached to each other, in particular, the apical angle a on the long diameter side is made as small as possible to improve the high-frequency characteristic. I was planning.

[0010]

However, in the above-described conventional configuration, the main magnet 2 and the cancel magnet 5 are formed on the bottom surface of the speaker frame 4 in order to increase the radiated sound, that is, to increase the output sound pressure level. It is necessary to maintain the output sound pressure level by enlarging the circular magnetic circuit, especially since the magnetic circuit is configured as a circle,
In the case of elliptical type, track type, etc., where the ratio of the major axis to minor axis is different, or in the case of limited space or limited shape such as speaker diameter, or the size is determined, the structure is realized at the expense of the output sound pressure level. I was letting it.

In order to maintain the output sound pressure level,
Conversely, the circular magnetic circuit protrudes more than the frame 4 of the loudspeaker, which greatly restricts the usage and the like. Further, since the apex angle a, particularly on the major diameter side, of the angle formed by the portion where the diaphragm 9 and the voice coil 7 are attached increases, the lower limit of the high-frequency reproduction of the sound pressure frequency characteristics is also reduced, which adversely affects the high-frequency characteristics. I was

The present invention solves the above-mentioned conventional problems. Even among types such as elliptical type and track type having different ratios of the major axis to the minor axis, limited space, and speaker aperture size,
A loudspeaker that combines a slim, compact shape that can be used under any conditions and an extended high-frequency characteristic that can achieve a sufficient output sound pressure level while maintaining a high magnetic flux density. The purpose is to provide.

[0013]

According to the present invention, there is provided a speaker according to the present invention, wherein a magnetic circuit formed by a main magnet, a cancel magnet, or the like on the bottom of a speaker frame has a rectangular magnetic gap, The outer diameter of the circuit is also rectangular, and the magnetic circuit is configured with different dimensions on the short side and long side, and the frame, voice coil, damper, diaphragm, and the neck of the dust cap are rectangular. With this structure, high magnetic flux density can be maintained and sufficient output sound pressure level can be maintained even in types such as elliptical type and track type, which have different ratios of major axis to minor axis, limited space, and speaker aperture size. Can earn
It is possible to provide a speaker having both a slim and compact shape and excellent acoustic performance realizing an extended high-frequency characteristic.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, the magnetic circuit has a rectangular magnetic gap, a magnetic circuit having an outer diameter of a rectangular type, and a magnetic circuit having a smaller diameter. The structure on the long diameter side is different, and the frame, voice coil, damper, and diaphragm connected to this are also rectangular structures, such as elliptical and track types with different ratios of long diameter to short diameter, and limited space. And among speakers of the caliber size, a speaker that can maintain a high magnetic flux density and achieve a sufficient output sound pressure level, and has excellent acoustic performance that realizes a slim, compact shape and extended high-frequency characteristics. To provide.

According to a second aspect of the present invention, the magnetic gap of the magnetic circuit has a non-uniform dimension in which the magnetic gap is made different on the short diameter side and the long diameter side, and the magnetic gap has a long diameter such as an elliptical type or a track type. In addition to reducing the disturbance of the amplitude mode and the seesaw phenomenon such as a voice coil, which are often found in the types having different minor diameter ratios, it also absorbs the dimensional variation of the magnetic gap during assembly.

An embodiment of the speaker according to the present invention will be described below with reference to FIGS. In the description, the same parts as those of the related art will be assigned the same part numbers and will not be described.

(Embodiment 1) FIG. 1 is a cross-sectional view showing one section of a speaker according to an embodiment of the present invention viewed from the long and short diameter sides, and FIG. 2 is an exploded perspective view of the speaker. FIG. 3 is a plan view of the rectangular magnetic circuit. Only the differences between the present invention and the prior art will be described with reference to FIG.
4 is a rectangular bottom plate, 15 is a rectangular main magnet, 16 is a rectangular top plate, 17 is a rectangular frame, 18 is a rectangular cancel magnet, and 19 is a rectangular cancel magnet. A rectangular shield cover 20 is a rectangular magnetic gap. 21 is a rectangular voice coil, 22 is a rectangular damper, 23 is a rectangular diaphragm, 24 is a rectangular dust cap, A is a rectangular diaphragm 23 and a rectangular Of the angle formed by the affixed portion of the voice coil 21 in particular, shows the apex angle on the long diameter side. As can be seen from the figures, each rectangular shape has a rectangular shape having a different ratio between the long diameter and the short diameter. .

In the present embodiment, the magnetic circuit has a rectangular magnetic gap 20 having a rectangular shape, an outer diameter of the magnetic circuit being rectangular, and further having different dimensions of the minor axis and the major axis of the magnetic circuit. All of the frame 17, the voice coil 21, the damper 22, the diaphragm, and the neck portion of the dust cap 24 to be connected thereto have a rectangular structure and do not protrude from the frame 17, and in particular, the magnetic circuit is formed in a rectangular shape. The output sound pressure level is sacrificed even when the size is determined or the size is determined, such as elliptical type or track type, where the ratio of the major axis to the minor axis is different, or the limited space and the shape of the speaker aperture. The structure can be freely established without the need to perform, and it can be used in a limited space, such as an elliptical type or a track type, or a type with a different ratio between the major axis and the minor axis, and even in a limited space and speaker aperture size. A loudspeaker that can maintain sufficient magnetic flux density and achieve a sufficient output sound pressure level, and has excellent acoustic performance that realizes a slim, compact shape and extended high-frequency characteristics that can be used under any conditions. It can be provided.

FIG. 4 shows the sound pressure frequency characteristic and the second harmonic distortion characteristic of the conventional speaker and the present embodiment.
It can be seen that the loudspeaker of the present embodiment exhibits a sound pressure frequency characteristic 28 higher than the sound pressure frequency characteristic 29 of the conventional speaker over the entire band. In addition, the low frequency range characteristic of the sound pressure frequency characteristic shows extended low-frequency reproduction, and the high frequency range has a remarkably extended high frequency characteristic. Further, it can be confirmed that, compared to the second harmonic distortion (conventional one 31), the one according to the present embodiment (30) achieves low distortion and high linearity can be obtained.

(Embodiment 2) Another embodiment of the speaker of the present invention will be described with reference to FIG.

FIG. 5 is a plan view of a rectangular magnetic circuit according to another embodiment of the present invention. Only the differences between the present invention and the prior art will be described with reference to the figure. Reference numeral 25 denotes a rectangular non-uniform magnetic gap in which the lengths of the magnetic gaps on the long and short diameter sides are different. And 27 is a minor-side gap of the rectangular non-uniform magnetic gap 25.

In the present embodiment, in particular, the ellipse which cannot be prevented by a uniform magnetic gap is provided by having a structure in which the dimension of the long diameter side gap 26 is larger than that of the short diameter side gap 27. Disturbance of the amplitude mode by allowing the long-side gap 26 to balance the short-side gap 27 by allowing the long-side gap 26 to degrade the linearity at the time of amplitude, which is often found in types having a different ratio between the long and short diameters such as a mold and a track type. In addition to reducing seesaw phenomena such as noise and voice coils, it is also possible to absorb dimensional variations of the magnetic gap having a long and short diameter at the time of assembling at a dimensional ratio between the long and short diameters.

In each of the above embodiments, the outer diameter of the magnetic circuit is rectangular, but the shape is not limited as long as it is non-circular such as track, square or rectangular. The same effect can be obtained in

[0024]

As described above, according to the present invention, the shape of the magnetic gap of the magnetic circuit is rectangular, the outer diameter of the magnetic circuit is rectangular, and the short side and the long side of the magnetic circuit have different dimensions. The frame, voice coil, damper, and diaphragm connected to it have a rectangular structure, so that the ratio of the major axis to the minor axis is different, such as elliptical or track type, or limited space and speaker Even among the caliber sizes, it is possible to maintain a high magnetic flux density and achieve a sufficient output sound pressure level, and to realize a slim and compact shape that can be used under any conditions and an extended high frequency characteristic A speaker having acoustic performance can be realized.

[Brief description of the drawings]

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

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a plan view of a rectangular magnetic circuit which is a main part of the same.

FIG. 4 is a characteristic diagram of a sound pressure frequency characteristic and a second harmonic distortion characteristic.

FIG. 5 is a plan view of a rectangular magnetic circuit which is a main part of another embodiment of the speaker of the present invention.

FIG. 6 is a sectional view of a conventional speaker.

FIG. 7 is a plan view of a magnetic circuit that is a main part of the same.

[Description of Signs] 14 Bottom plate 15 Main magnet 16 Top plate 17 Frame 18 Cancel magnet 19 Shield cover 20 Magnetic gap 21 Voice coil 22 Damper 23 Vibration plate 24 Dust cap 25 Non-uniform magnetic gap 26 Gap 27 Gap A

Claims (2)

[Claims] 1. A speaker in which the shape of a magnetic gap of a magnetic circuit is rectangular, the outer diameter of the magnetic circuit is rectangular, and a frame, a voice coil, a damper, and a diaphragm are rectangular. 2. The loudspeaker according to claim 1, wherein the magnetic gap of the magnetic circuit has different dimensions on the major axis side and the minor axis side.