JPH1013993A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve high-input resistance and high linearity by making the shape of outer diameter of a damper which holds a middle part of a voice coil quadrangular and providing adjacent lines with space. SOLUTION: A damper 31 centrally holds a middle part of a voice coil 30 which drives a diaphragm 29, utilizes a space of a frame 26 in a direction of length and unites with a magnetic gap 25, putting itself into the gap 25. A dust cap is attached to the top of the coil 30. The damper 31 has down semicircular, down roll-type corrugation parts 31A in a direction of length and up semicircular, up roll-type corrugation parts in a direction of breadth with the corrugation parts of the same shape facing with each other. A flat surface of the damper 31 is quadrangular, and the damper 31 has some space on its diagonal lines except their ends. Therefore, the damper 31 separately secures the degree of freedom of vibrations for up and down roll-type corrugation parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elliptical or track-shaped slender speaker used for various audio equipment and video equipment.

[0002]

2. Description of the Related Art FIG.
The track-type speaker shown in FIGS. 6 and 7 will be described.

FIG. 5 is a sectional view in the major axis direction, FIG. 6 is a sectional view in the minor axis direction, and FIG. 7 is a top view without the diaphragm.
According to the drawing, a frame 6 is coupled to an upper plate 2 of a magnetic circuit 4 configured by sandwiching a magnet 1 between an upper plate 2 and a lower plate 3.
A diaphragm 9 having a configuration in which cone paper 7 is clamped by an edge 8 is adhered to a peripheral portion of the voice coil 10, and an intermediate portion of a voice coil 10 for driving the diaphragm 9 is formed into a circular damper 1.
1 and is coupled so as to fit into the magnetic gap 5, and a dust cap 12 is provided on the upper surface of the voice coil 10.
It was constructed by bonding.

[0004]

However, this kind of conventional loudspeaker has a drawback in terms of its skill, which is affected by its slim shape, such as a track shape. There is a problem that it is difficult in terms of design to achieve input and high linearity.

[0005] The cause of this is that the damper 11 largely determines the amplitude of the vibration system of the speaker, and since the shape of this type of speaker is a track type, the outer shape of the damper 11 is circular. This is because it is limited by the dimension of the track type in the minor diameter direction, and a damper having a large outer dimension cannot be used. Therefore, since it is not possible to secure a large amplitude of the vibration system, it is difficult in design to achieve high input resistance and high linearity.

The present invention solves such a conventional problem,
It is an object of the present invention to provide an excellent speaker that can achieve high input resistance and high linearity.

[0007]

According to the present invention, a voice coil mounted on a diaphragm having a peripheral portion connected to a frame connected to a magnetic circuit is fitted into a magnetic gap of the magnetic circuit. The outer shape of the damper holding the middle part of the voice coil is not a circle but a square shape, and a gap is provided between adjacent sides.In a track-type speaker, the damper is arranged with a good space factor, This makes it possible to secure a large amplitude.

[0008]

According to the first aspect of the present invention, a voice coil mounted on a diaphragm having a peripheral portion coupled to a frame coupled to a magnetic circuit is fitted into a magnetic gap of the magnetic circuit. The middle part of the voice coil has a square planar shape, and is held by a damper having a gap between adjacent sides, thereby improving the space factor of the damper for a track-type speaker and increasing the amplitude of the damper. As a result, high input resistance can be achieved.

According to a second aspect of the present invention, a damper having corrugations on opposing sides of a quadrilateral having the same shape is used, and has an effect of suppressing the occurrence of rolling in the short diameter direction and the long diameter direction. Have

According to a third aspect of the present invention, a rectangular frame is provided with a damper having an up-roll shape corrugation on the short diameter side and a down-roll shape corrugation on the long diameter side. Utilizing the extra space, the effect of improving the space factor of the damper is further improved, and the nonlinearity of the vertical amplitude characteristic of each of the up roll shape and the down roll shape is canceled by each other, thereby increasing the vertical amplitude. This has the effect of improving the symmetry and the linearity.

An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a longitudinal sectional view of an embodiment of the elongated speaker of the present invention, FIG. 2 is a sectional view of the same minor direction, and FIG. 3 is a top view without the diaphragm. FIG. 4 is a perspective view of a damper which is the main part.

A frame 26 is connected to an upper plate 22 of a magnetic circuit 24 having a magnet 21 sandwiched between an upper plate 22 and a lower plate 23, and a cone paper 27 is clamped to the peripheral edge of the frame 26 by an edge 28. The voice coil 30 for driving the vibration plate 29 is bonded to the voice coil 30 by using a damper 31 of a down-roll type corrugation portion 31A utilizing a space on the long diameter direction side of the frame 26. The voice coil 30 is joined so as to fit into the magnetic gap 25 while maintaining the center, and a dust cap 32 is adhered to the upper surface of the voice coil 30.

As shown in FIG. 1, the damper 31 has a lower semi-circular down-roll type corrugation section 31A in the major axis direction, and an upper semi-circular up-roll type corrugation section in the minor axis direction. Opposite sides having 31B are corrugated portions having the same shape, and a slight gap 31C is provided on the diagonal line of the quadrilateral damper 31 having a planar shape of the damper 31 constituted by these excluding the edge. The degree of freedom of vibration of each of the up-roll type corrugation unit 31B and the down-roll type corrugation unit 31A is ensured.

As described above, in the present embodiment,
The damper 31 has a quadrilateral shape, a slight gap 31C is provided on the diagonal line, the degree of freedom of the adjacent corrugation part is secured, the space factor is improved compared to the conventional damper, and high input resistance and high linearity are achieved. In addition, the corrugations facing each other have the same shape to prevent the occurrence of rolling in the short diameter direction and the long diameter direction.

Further, in the above embodiment, in the minor axis direction in which the gap between the frame 26 and the voice coil 30 is narrow, the efficiency of the space factor of the damper 31 in the minor axis direction in which the gap is small as the up-roll type corrugation portion 31B. Of the up-roll type corrugation unit 3
By canceling out (mutually complementing) the non-linearity of the vertical amplitude characteristics of each of the 1B and the down-roll type corrugation section 31A, the symmetry in the vertical amplitude can be secured and the linearity can be further improved. is there.

[0016]

As described above, according to the speaker of the present invention, the speaker is formed by using a damper having a square planar shape and a gap provided between adjacent sides, thereby improving the space factor of the damper. It is possible to improve the limit of the amplitude and increase the input resistance.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view in the same minor diameter direction.

FIG. 3 is a top view without the diaphragm.

FIG. 4 is a perspective view of a damper as the main part.

FIG. 5 is a cross-sectional view of a conventional elongated speaker.

FIG. 6 is a cross-sectional view in the minor axis direction.

FIG. 7 is a top view without the diaphragm.

[Explanation of symbols]

 Reference Signs List 24 magnetic circuit 25 magnetic gap 26 frame 29 diaphragm 30 voice coil 31 damper 31A down-roll type corrugation part 31B up-roll type corrugation part 31C gap

Claims (3)

[Claims] 1. A voice coil attached to a diaphragm having a peripheral portion coupled to a frame coupled to a magnetic circuit is fitted into a magnetic gap of the magnetic circuit, and an intermediate portion of the voice coil has a rectangular shape having at least a planar shape. And a speaker held by a damper having a gap between adjacent sides. 2. The loudspeaker according to claim 1, wherein a damper having corrugations on opposite sides of the quadrilateral having the same shape is used. 3. The loudspeaker according to claim 2, further comprising a damper in which a corrugated portion having an up-roll shape is disposed on the short-diameter side and a down-roll-shaped corrugation portion is disposed on the long-diameter side of the rectangular frame.