JP4006843B2 - Speaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a speaker used for various audio equipment.
[0002]
[Prior art]
The prior art will be described with reference to a cross-sectional view in the major axis direction of the elliptical speaker shown in FIG.
[0003]
According to the figure, a frame 6 is coupled to an upper plate 2 of a magnetic circuit 5 formed by superimposing a magnet 1 and an upper plate 2 on a lower plate 4 having a center pole 3. The diaphragm 7 is bonded and bonded, and the middle portion of the voice coil 8 coupled to the central portion for driving the diaphragm 7 is held by the damper 9 so as to fit into the magnetic gap 10. The dust cap 11 is adhered to the surface of the joint portion with the voice coil 8.
[0004]
[Problems to be solved by the invention]
However, the above-described speaker is configured to support the voice coil 8 with a soft support system (such as the diaphragm 7) that is small in size and capable of large amplitude so as to be compatible with small size, heavy bass reproduction, and high input resistance. Therefore, when a large input is applied as shown in FIG. 7, the amplitude of the vibration system increases, rolling occurs, the center holding force of the support system weakens, the voice coil 8 swings up and down while being biased , and the lower plate 4 A gap defect or a high gap defect in contact with the center pole 3 (a normal gap defect occurs due to a large amplitude due to a relatively large signal input to the voice coil 8, whereas an input signal is at a specific relatively high frequency. It is a problem that the voice coil 8 is likely to occur).
[0005]
These gap defects and high gap defects may be caused by factors such as the routing of the tinsel wire (not shown) that connects the voice coil 8 and the input terminal, which affects the shape of the support system and the support system, and the like. It is thought that it occurs near the limit value because it is not well balanced.
[0006]
The present invention solves the above-mentioned problems, and provides an excellent speaker that can realize small size, reproduction of heavy bass and high input resistance, and suppresses occurrence of gap failure or high gap failure.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, a speaker according to the present invention includes a lower plate having a center pole and a magnetic circuit in which a magnet and a top plate are superimposed on each other to form a magnetic gap between the center pole and the top plate. A frame coupled on the magnetic circuit; a diaphragm coupled to the voice coil having an outer circumferential edge coupled to the frame and an inner circumferential edge fitted in the magnetic gap; and at least an upper end portion of the center pole. It is composed of a notch portion that avoids collision with the voice coil during amplitude driving of the diaphragm provided in an arc shape in the outer circumferential direction, and suppresses contact with the center pole of the voice coil to cause a gap failure or Providing an excellent speaker that suppresses the occurrence of high-gap defects and can achieve small size, heavy bass reproduction, and high input resistance. It is.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 of the present invention comprises: a lower plate having a center pole; and a magnetic circuit formed by superposing a magnet and a top plate thereon to form a magnetic gap between the center pole and the top plate; A frame coupled on the magnetic circuit, a diaphragm coupled to the voice coil having an outer circumferential edge coupled to the frame and an inner circumferential edge fitted in the magnetic gap, and an outer circumference including at least an upper end portion of the center pole It is composed of a notch that avoids collision with the voice coil during amplitude vibration of the diaphragm provided in an arc shape in the direction, and suppresses the contact of the voice coil with the center pole to prevent gap failure or high The present invention provides an excellent speaker that suppresses the occurrence of gap defects.
[0009]
The invention according to claim 2 of the present invention comprises: a lower plate having a center pole; and a magnetic circuit formed by superposing a magnet and a top plate thereon to form a magnetic gap between the center pole and the top plate; An elliptical frame coupled on the magnetic circuit; an elliptical diaphragm coupled to the voice coil having an outer circumferential edge coupled to the elliptical frame and an inner circumferential edge fitted into the magnetic gap; and The center pole is composed of a notch portion that avoids collision with the voice coil provided in an arc shape in the outer circumferential direction including at least the upper end portion in the major axis direction of the diaphragm. circular, including an elongated shape such as a track shape) bias due gap defect and Haigya to the major axis direction during the amplitude of the voice coil due to the shape of the speaker It is intended to prevent up bad.
[0010]
According to a third aspect of the present invention, the center pole diaphragm of the second aspect avoids a collision with a voice coil provided in an arc shape in the outer circumferential direction including at least the upper end portion in the minor axis direction. A notch is provided to prevent gap failure and high gap failure due to bias in the minor axis direction, which is one of the major factors in the major axis direction at the time of amplitude of the voice coil due to the speaker shape.
[0011]
According to a fourth aspect of the present invention, the center pole and the lower plate of the first aspect are configured as separate bodies so that the direction of the notch can be adjusted in the rotational direction, and are fixed after adjustment. not due to the shape (high) is obtained by allowing the direction adjustment of the cut-out portion of the center pole at the gap defect or notch of the notch direction of the upcoming state completion of fine adjustment, such as a speaker.
[0012]
Hereinafter, an embodiment of the speaker of the present invention will be described with reference to FIGS.
[0013]
(Embodiment 1)
FIG. 1 is a cross-sectional view on the long diameter side of an elliptical speaker which is an embodiment of the speaker of the present invention, and FIG. 2 is a perspective view of a lower plate having a center pole which is the main part. FIG. 4 is a top view of the same development example. FIG.
[0014]
According to the figure, a frame 26 is coupled to the upper plate 22 of a magnetic circuit 25 formed by superimposing a magnet 21 on a lower plate 24 having a center pole 23 together with an upper plate 22. The outer peripheral edge of the diaphragm 27 is adhesively bonded, and the inner peripheral edge is adhesively bonded to the voice coil 28 so as to fit into the magnetic gap 30 between the upper plate 22 of the magnetic circuit 25 and the center pole 23. .
[0015]
Reference numeral 29 denotes a damper whose inner peripheral edge is adhesively bonded to the voice coil 28 and whose outer peripheral edge is adhesively bonded to the frame 26. Reference numeral 31 denotes a dust cap bonded to the upper surface of the connecting portion of the diaphragm 27 with the voice coil 28. .
[0016]
As shown in FIG. 2, the center pole 23 has an arc-shaped notch 40 in the outer peripheral direction including the upper end, and the notch 40 is formed on the diaphragm 27 of the elliptical speaker as apparent in FIG. It is provided on both sides in the major axis direction so as to avoid collision with the voice coil .
[0017]
With the above-described configuration, the gap between the magnetic gaps 30 in the major axis direction that tends to be biased when the voice coil 28 swings is widened to secure a distance between the voice coil 28 and the center pole 23, thereby preventing gap defects and high gap defects.
[0018]
That is, in the above embodiment, since the shape of the speaker is elliptical, different vibration modes occur in the major axis direction and the minor axis direction, and this is a mechanism for inducing gaps and high gap defects by rolling. In particular, rolling frequently occurs in the major axis direction where the weight balance is easily lost. Therefore, the center pole 23 is provided with a notch 40 in an arc shape in the outer circumferential direction including two upper ends in the major axis direction. The distance between the center pole 23 and the center coil 23 is secured , and the collision with the voice coil can be avoided .
[0019]
FIG. 4 shows a development example of the above-described embodiment. As a countermeasure to the minor axis direction in which the rolling occurs frequently in the major axis direction, another notch in the arc shape in the outer circumferential direction including the upper end also in the minor axis direction. The portion 41 is provided, which is effective for rolling in both the major axis and minor axis directions, and can prevent gap defects and high gap defects.
[0020]
In the above embodiment, an elliptical speaker has been described. However, the present invention is effective even when applied to all loudspeakers having a major axis direction and a minor axis direction. Oblong, track, and elongated speakers are also included.
[0021]
(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 is omitted.
[0022]
FIG. 5 is a perspective view of a lower plate which is a main part of another embodiment of the present invention. The lower plate 24a includes a center pole portion 23a provided with a notch 40 in an arc shape in the outer peripheral direction including the upper end portion, and a lower portion. The center pole part 23a is configured to be separated from the plate part 24b and is press-fitted and held to the lower plate part 24b so that it can be rotated. This makes it possible to adjust the rotation.
[0023]
That is, the gap defect can be corrected after it is assembled to make it non-defective.
[0024]
If the direction of the notch 40 is adjusted from the shape of the speaker as in the first embodiment, it can be handled by assembling with high accuracy, but as described above, the support system is affected. When there is something to be given (for example, handling of a tinsel wire), it is particularly effective when the bias direction at the time of amplitude of the voice coil 28 is confirmed and adjusted at the final stage of assembling the speaker.
[0025]
Therefore, it goes without saying that the present invention can be applied not only to the elliptical speaker in the above embodiment, but also to a general cone-shaped planar shape.
[0026]
In the above-described embodiment, the center pole portion 23a has been described as being press-fitted and held to the lower plate portion 24b so that it can be rotated. Other known means such as screwing may be used.
[0027]
As described above, the present invention suppresses a gap defect by providing a cutout portion in the center pole corresponding to the direction of the bias of the voice coil at the time of the amplitude of the voice coil of the speaker, and can achieve small size, heavy bass reproduction, and high input resistance. It provides an excellent speaker.
[0028]
【The invention's effect】
The speaker more to the outer circumference including the upper end portion of the center pole corresponding to deviation direction during the voice coil amplitude provided an arc-shaped notch, the voice coil is in contact tends gap position of the present invention as described above Position the notch of the center pole to secure the distance between the voice coil and the center pole, avoid collision with the voice coil , suppress gap and high gap defects, increase input resistance, and achieve deep bass reproduction. It is possible to provide an excellent speaker capable of greatly improving performance.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a major diameter side of an embodiment of a speaker of the present invention. FIG. 2 is a perspective view of a lower plate which is the main part. FIG. 3 is a top view. FIG. 5 is a perspective view of a lower plate which is a main part of the other embodiment. FIG. 6 is a cross-sectional view of a conventional speaker. FIG. 7 is a cross-sectional view of a conventional speaker when rolling occurs. Explanation】
21 Magnet 22 Upper plate 23 Center pole 23a Center pole portion 24 Lower plate 24a Lower plate 24b Lower plate portion 25 Magnetic circuit 26 Frame 27 Diaphragm 28 Voice coil 29 Damper 30 Magnetic gap 40, 41 Notch

Claims (4)

A magnetic circuit formed by forming a magnetic gap between the center pole and the top plate by superimposing a magnet and a top plate on the lower plate having a center pole, a frame coupled to the magnetic circuit, and an outer A diaphragm having a peripheral edge coupled to the frame and an inner peripheral edge coupled to the voice coil fitted in the magnetic gap, and the diaphragm provided in an arc shape in the outer circumferential direction including at least the upper end portion of the center pole. A speaker comprising a notch for avoiding a collision with the voice coil during amplitude vibration. A lower plate having a center pole, a magnetic circuit in which a magnet and a top plate are superimposed thereon to form a magnetic gap between the center pole and the top plate, and an elliptical frame coupled on the magnetic circuit And an elliptical diaphragm coupled with an outer peripheral edge to the elliptical frame and an inner peripheral edge coupled to the voice coil fitted in the magnetic gap, and at least the upper end of the center pole in the major axis direction of the diaphragm And a notch for avoiding a collision with the voice coil provided in an arc shape in the outer circumferential direction including the portion . 3. The speaker according to claim 2, further comprising another notch for avoiding a collision with a voice coil provided in an arc shape in an outer circumferential direction including at least an upper end portion in a minor axis direction of the diaphragm of the center pole.   The speaker according to claim 1, wherein the center pole and the lower plate are configured separately so that the direction of the notch can be adjusted in the rotation direction, and fixed after adjustment.

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