JPH11150791A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of abnormal sound by equalizing the shapes of the arcs of the roll of a damper supporting a voice coil and the roll of an edge thereby preventing amplitude from being restricted by the roll shorting arc length at threshold amplitude at the time of a large input. SOLUTION: An edge 1 in the form of an arc RE with a single upper roll and the damper 2 of an ark length RD with an upper roll in the same shape as the edge 1 are provided to hold the voice coil 4 respectively fixed to a dome- like oscillator 3. At this time, the arc lengths of the damper 2 and the edge 1 are respectively equally R. At the time of taking a threshold amplitude L straightening the ark of the edge 1 upward at this oscillation system, the edge 1 and the damper 2 are respectively expanded and the threshold amplitude L at the time depends on the arc lengths R of the edge 1 and the damper 2. Consequently, thrusting sound at the time of largest input is eliminated by equalizing the arc lengths R of the edge 1 and the damper 2 and nearly equalizing a shape size for equalizing the threshold amplitude and a largest amplitude.

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, the digitization of information equipment has led to higher sound quality of music sources and higher image quality of screens of television receivers and the like. I have.

Here, a conventional speaker will be described with reference to a side sectional view of FIG. As shown in the figure, the conventional speaker has a frame 22 coupled to an upper plate 18 of a magnetic circuit 20 having a magnet 17 sandwiched between an upper plate 18 and a lower plate 19. Edge 23 which is the outer peripheral portion of
The center of the bobbin 25 of the voice coil 24 for driving the diaphragm 23 is centered by the damper 27, and the diaphragm 2 is fitted into the magnetic gap 21.
3 and a dust cap 26 made of paper or non-woven fabric is adhered to the upper surface of the bobbin 25.

[0004]

However, in the above-mentioned loudspeaker, since the arc length of the roll of the damper and the roll of the edge are different, the amplitude is limited to the corrugation having the shorter arc length at the limit amplitude at the time of large input. However, there is a problem that an abnormal sound such as a flattening sound is generated.

An object of the present invention is to solve the above-mentioned problems and to provide a loudspeaker in which abnormal sounds such as clipping sound at a limit amplitude at the time of a large input are reduced.

[0006]

According to the present invention, there is provided a loudspeaker according to the present invention, wherein a frame is coupled to a top surface of a magnetic circuit having a magnetic gap, and a voice coil which fits into the magnetic gap at a peripheral portion of the frame. In the loudspeaker with the edge of the diaphragm attached to the center, the roll shape of the damper supporting the voice coil and the arc shape of the edge roll are substantially the same, so that the amplitude is limited to a roll having a short arc length. Since there is no such noise, it is possible to prevent abnormal sounds such as clipping sounds.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention focuses on a voice coil which is connected to a top surface of a magnetic circuit having a magnetic gap and which fits into the magnetic gap at the periphery of the frame. In the speaker with the edge of the combined diaphragm attached, the shape of the arc of the roll of the damper supporting the voice coil and the shape of the arc of the edge roll are almost the same, and the amplitude is limited to the roll with a short arc length. Since there is no limit amplitude in the vertical direction, it is possible to prevent abnormal sounds such as clipping sounds.

According to a second aspect of the present invention, the directions of the arcs of the roll of the damper and the roll of the edge supporting the voice coil are substantially symmetrical with respect to a horizontal plane. It is intended to eliminate a vertical stress difference applied to the roll and to reduce third-order nonlinear distortion.

An embodiment of a speaker according to the present invention will be described below with reference to FIGS. Note that the same parts as those in the prior art are denoted by the same reference numerals, and description thereof will be omitted.

(Embodiment 1) FIG. 1 is a cross-sectional view of a speaker according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of an essential part, an edge and a damper, at maximum amplitude. FIG. 3 is a cross-sectional view when the roll shapes of the edge and the damper are different and the arc lengths are different from each other, and FIG. 4 is a cross-sectional view at the time of the maximum amplitude of the edge and the damper, which are the main parts.

According to FIG. 1, reference numeral 1 denotes an edge of an arc length RE having a single upward roll, and 2 denotes a damper of an arc length RD having an upward roll having the same shape as the edge 1 described above. The configuration is such that the voice coil 4 fixed to the shaped diaphragm 3 is held. At this time, the arc lengths of the damper 2 and the edge 1 are equal to R, respectively.

In the vibration system configured as described above, when the arc of the edge 1 takes the limit amplitude L at which the arc of the edge 1 becomes straight, the edge 1 and the damper 2 are expanded as shown in FIG. Is dependent on the arc length R of the edge 1 and the damper 2 as shown in (Equation 1).

[0013]

(Equation 1)

Referring to FIG. 3, the limit amplitude of the conventional speaker will be described in comparison with FIG. 2. As shown in FIG. 3, the roll shape of the edge 7 and the damper 8 is different as shown in FIG.
, The critical amplitude L depends on the arc length RE of an edge having a short arc length, as shown in (Equation 2).

[0015]

(Equation 2)

Therefore, as shown in FIG. 4, when the maximum input of the maximum amplitude LD at which the long RDa of the damper 8 is linear is generated as shown in FIG. 4, the long RDa has an amplitude greater than the limit amplitude. However, as described above, the arc lengths of the edge 1 and the damper 2 are made equal, and the limit amplitude and the maximum amplitude are reduced. By making the shapes and dimensions substantially the same so as to make them the same, it is possible to prevent a rattling sound at the time of maximum input.

(Embodiment 2) Another embodiment of the present invention will be described with reference to FIGS. 5, 6, and 7. FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description is omitted.

FIG. 5 is a sectional view showing the relationship between the edge 11 and the damper 12, which is a main part of another embodiment of the present invention. FIG. 6 is a sectional view when the edge 11 and the damper 12 oscillate upward. FIG. 7 is a cross-sectional view when the edge 11 and the damper 12 oscillate downward.

According to the figure, the difference from the first embodiment is that a roll of the damper 2 and a roll of the edge 1 are provided with a damper 12 and an edge 11 whose arc directions are line-symmetric with respect to a horizontal plane.

Referring to FIG. 6, when the amplitude is upward, the stress acting on the edge 11 and the damper 12 is A and B, respectively, and the resultant force is C in the upward direction. In addition, the lower amplitude will be described with reference to FIG. 7. The stress acting on the edge 11 and the damper 12 is −
A, -B, and the resultant is -C in the downward direction.

Here, comparing the above-mentioned stresses A and -A, it can be seen from FIG. 5 that the arc directions of the roll of the damper 12 and the roll of the edge 11 are line-symmetric with respect to the horizontal plane, so that the resultant force generated at the time of vertical amplitude is obtained. A and −A are equal in magnitude and have vectors whose directions are opposite to the horizontal plane.

Therefore, the vertical stress difference applied to each roll at the time of the amplitude is canceled, and the third-order nonlinear distortion does not occur. Therefore, the distortion level can be reduced in the vertical amplitude.

[0023]

As described above, the loudspeaker according to the present invention can be formed into a roll having a short arc length at the limit amplitude at the time of a large input by making the shape of the arc of the roll of the damper supporting the voice coil and the shape of the roll of the edge roll the same. Since the amplitude is not limited, it is possible to prevent abnormal sounds such as clipping sounds.

[Brief description of the drawings]

FIG. 1 is a sectional view of an edge and a damper, which are main parts of an embodiment of a speaker according to the present invention.

FIG. 2 is a sectional view of a main part at the time of the maximum amplitude.

FIG. 3 is a cross-sectional view of a case where the roll shapes of the edge and the damper, which are the main parts of the speaker, are different and the arc lengths are different from each other.

FIG. 4 is a cross-sectional view of a main part of the edge and the damper at the maximum amplitude.

FIG. 5 is a cross-sectional view of a main part showing a relationship between an edge and a damper, which is a main part of another embodiment of the present invention.

FIG. 6 is a cross-sectional view of a main part when the amplitude is upward.

FIG. 7 is a cross-sectional view of a main part when the amplitude is downward.

FIG. 8 is a side sectional view of a conventional speaker.

[Explanation of symbols]

 1, 11 edge 2, 12 damper 4 voice coil 20 magnetic circuit 21 magnetic gap 22 frame

Claims (2)

[Claims] 1. A loudspeaker comprising: a frame connected to an upper surface of a magnetic circuit having a magnetic gap; and an edge of a diaphragm connected to a center of a voice coil which fits into the magnetic gap is attached to a peripheral portion of the frame. A speaker in which the shape of the roll of the damper that supports the coil and the shape of the roll of the edge are approximately equal. 2. The speaker according to claim 1, wherein the directions of the arcs of the roll of the damper and the roll of the edge supporting the voice coil are substantially line-symmetric with respect to a horizontal plane.