JP3323256B2 - Speaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker edge.

[0002]

2. Description of the Related Art In recent years, digital signal processing technology has advanced remarkably, and the quality of electric signals supplied to the speaker has been greatly improved. Accordingly, a speaker capable of reproducing high sound quality has been strongly desired. ing. Hereinafter, a conventional speaker will be described with reference to the drawings.

FIG. 6 is a sectional view of the structure of a conventional speaker, wherein 1 is a plate, 2 is a yoke integrally formed with the plate 1, 3 is a magnet fixed to the plate 1, and 4 is fixed to the upper surface of the magnet 3. The center pole 5 is a voice coil held in a magnetic gap formed by the outer circumference of the center pole 4 and the inner circumference of the yoke 2, 6 is a bobbin of the voice coil 5, 7 is a cone fixed to the tip of the voice coil bobbin 6. Reference numeral 8 denotes a damper fixed to an outer peripheral portion of the voice coil bobbin 6, reference numeral 9 denotes a semicircular edge provided on an outer peripheral portion of the cone-shaped diaphragm 7, and reference numeral 10 denotes a damper 8.
And a frame holding the outer periphery of the edge 9 and holding a magnetic circuit composed of the plate 1, the yoke 2, the magnet 3, and the center pole 4.

In the above configuration, when an electric signal is applied to the voice coil 5, the driving force generated in the voice coil 5 is transmitted to the voice coil bobbin 6, and vibrates the cone-shaped diaphragm 7 fixed to the tip.

[0005]

In such a conventional loudspeaker, the cone-shaped diaphragm 7 is supported by a damper 8 and an edge 9 fixed to the outer peripheral portion of the voice coil bobbin 6, and the linearity of the supporting force of these supports is obtained. Is a problem especially during reproduction in the low-frequency range where the amplitude is large, and is a cause of harmonic distortion. In particular, a small-diameter woofer needs to have a large amplitude to obtain the same level of sound pressure at the same frequency in the low frequency range as compared to a large-diameter woofer. However, when such a large amplitude is used, there is a problem that the margin of the amplitude of the edge is small, so that the edge is stiff, and this causes breakage of the edge, leading to a reduction in the input resistance. Conventionally, in order to increase the amplitude margin of the edge 9, the roll width is widened like a roll indicated by a dotted line in FIG. However, this method has a problem that the area of the diaphragm 7 is reduced, the sound pressure is reduced, and edge resonance is likely to occur.

[0008] FIG. 8 shows the vibration state of the edge 9. In the figure, A shows a neutral state before an electric signal is applied to the voice coil 5, B shows a state of vibrating forward from the neutral point, and C shows a state of vibrating backward from the neutral point. In each vibration state, it is assumed that the amplitude value 動 く in which the cone-shaped diaphragm 7 moves back and forth with respect to the neutral point is the same. At this time, assuming that the air amount when moving from the position A to the state B is U1 and the air amount when moving from the position A to the state C is U2, the edge that is amplitude with the cone-shaped diaphragm 7 is U2. As shown in FIG. 8, the amount of air removed by 9 differs from that shown in FIG. The sound pressure characteristic as a speaker is proportional to the sum of the cone-shaped diaphragm 7 and the amount of air removed by the edge 9, but the sound pressure radiated from the edge 9 depends on the amount of air removed before and after as described above. Therefore, the sound pressure characteristic of the loudspeaker necessarily includes a distortion component because the sound pressure characteristic differs depending on the movement of the speaker.

The present invention has been made to solve the above-mentioned problems, and has a linear support force for an edge serving as a support for a diaphragm.
It is an object of the present invention to realize a speaker in which the amplitude margin is improved and harmonic distortion caused by the asymmetry of the air exclusion amount is significantly reduced.

[0008]

In order to solve the above-mentioned object, the present invention divides the length direction of an edge into a plurality of pieces,
The cross-section of the adjacent divided pieces as vertically symmetrical parabolic curved roll form, between the split pieces and the adjacent divided pieces connected by connecting portions in cross-section changes gradually and continuously, of the edge the circumferential or outer peripheral diaphragm, further on the outer or inner periphery of the front Symbol edge in which a structure formed by joining the frame.

[0009]

According to the present invention, by making the cross section of the roll into a parabolic curve as described above, the roll length can be increased even with the same roll width as the semicircular roll, and a large amplitude margin can be obtained. . Further, since the edge is divided into a plurality of pieces and the adjacent divided pieces have a symmetrical structure, the air removed from one piece of the edge and the air removed from one adjacent piece together with the amplitude of the diaphragm. Is equal to the vertical amplitude at the neutral point when no electric signal is applied, regardless of the two connected pieces connected to any connecting portion. Further, the asymmetry of the supporting force due to the asymmetry of the structure can be improved.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a structural sectional view of a speaker according to a first embodiment of the present invention. In this figure, the same components as those of the conventional example shown in FIG. 6 are denoted by the same reference numerals. In this embodiment, the configuration and operation are almost the same as the conventional example,
The difference is that the cross-sectional shape of the edge 20 in FIG. 1 is a parabolic curve. That is, the configuration of the present embodiment aims at improving the margin of the amplitude of the edge among the above-mentioned problems of the conventional speaker. 2A and 2B are diagrams showing a structure of a speaker according to a second embodiment of the present invention. FIG. 2A is a plan view, and FIG. 2B is a cross-sectional view along AA ′. The present embodiment is significantly different from the conventional example in that the edge 11 is divided into four parts in the circumferential direction and concave and convex rolls partially formed of a parabolic curve are selectively used. 12 and 13 are convex rolls, 14 and 15 are concave rolls vertically symmetrical to the convex roll, and 16, 17, 18 and 19 are connecting portions.

FIG. 3 is a perspective view showing the appearance of the vicinity of the connecting portion 17 of the edge 11. The convex roll 13 and the concave roll 15 have a vertically symmetric structure, and are connected therebetween by a connecting portion 17 whose cross section changes gradually and continuously. The shape of the connecting portion 17 will be described in more detail with reference to FIG. FIG. 4 (a)
5 is a plan view of the vicinity of the connecting portion 17 of the edge 11, and FIG. 5B shows a cross section of each portion shown in FIG. As shown in FIG. 4B, the connecting portion 17 has a convex shape and a concave shape, and as shown in FIG. When it becomes smaller and reaches the convex roll 13, the diameter of the concave roll becomes zero and becomes the same shape as the convex roll 13. Conversely, the diameter of the concave roll of the connecting portion 17 becomes larger and the diameter of the convex roll becomes smaller as it approaches the concave roll 15, and when it reaches the concave roll 15, the diameter of the convex roll becomes zero and has the same shape as the concave roll 15. Becomes

The operation of the above configuration will be described. When an electric input is applied to the voice coil 5, the connecting portion 16,
Convex rolls 12, 1 connected by 17, 18, 19
The rolls 3 and the concave rolls 14 and 15 operate as a support for the cone diaphragm 7 without obstructing the vertical amplitude movement of the cone diaphragm 7, and radiate from the back surface of the cone diaphragm 7 together with the connecting portions 16, 17, 18 and 19. Acoustic shielding of the sound produced.

First, when the cone diaphragm 7 oscillates upward,
The convex rolls 12 and 13 are in the state of B in the vibration state of the roll-shaped edge shown in FIG. 8, that is, the air displacement amount is U1, while the concave rolls 14 and 15 are in the state of C in the vibration state of FIG. The state is inverted in the vertical direction, and the air exclusion amount is U2. Next, when the cone diaphragm 7 oscillates downward, the convex rolls 12 and 13 are in the state of C in the vibrating state of the roll-shaped edge shown in FIG. Reference numeral 15 indicates a state in which the state of B in the vibration mode shown in FIG. That is, the combined amount of air removed by the pair of convex rolls and concave rolls for each of the upper and lower amplitudes is always constant at U1 + U2, and the asymmetry of the amount of air removed is eliminated. Exactly the same is true for the convex roll and the concave roll provided continuously to the connecting portions 16, 18, and 19.

FIG. 5 shows the sound pressure frequency characteristics of a 14 cm diameter speaker using the edge of the present invention. When FIG. 5 is compared with FIG. 9, the characteristic of the conventional speaker shown in FIG.
It can be seen that the second harmonic distortion is significantly reduced in the low frequency range below 00 Hz.

In the above-described second embodiment, the number of the connecting portions is four. However, the number of the connecting portions is two or more even numbers. As long as the total amount of air removed by the parabolic curve-shaped divided pieces is constant, the asymmetry of the air removal amount is eliminated, and the same effect as in the present embodiment is exerted. Therefore,
Naturally, the cross-sectional shape of the edge is the same as in this embodiment.
It is not limited to a simple parabolic curve shape, but may be an elliptic curve shape.
I don't know.

Furthermore, the entire roll width of each connecting portion does not necessarily have to be equal to the divided piece as in this embodiment, and may have a flat surface at the end.

[0018]

As described above, according to the present invention, by making the cross section of the edge a parabolic curve or an elliptic curve , the roll length can be increased without increasing the edge width, and the amplitude margin of the edge can be increased. growing. Further, the roll end is hard to move at the time of the amplitude, and the stress applied to the boundary between the fixed portion and the movable portion is small, so that the input resistance can be improved. Furthermore, the edge is divided into a plurality of pieces, for example, if one piece is a convex roll, the adjacent piece has a symmetrical structure of a concave roll, and the cross section between the divided pieces gradually continues. Air removed from one piece of the edge with respect to the vertical amplitude of the diaphragm,
The combined amount of air removed from one adjacent piece and the adjacent piece are equalized in each part, greatly reducing the second harmonic distortion of the sound pressure characteristic caused by the asymmetry of the air removal amount at the edge, which occurred conventionally. Accordingly, it is possible to provide a speaker having extremely low distortion and high input resistance, for example, the asymmetry of the supporting force caused by the asymmetry of the edge structure can be improved.

[Brief description of the drawings]

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

FIG. 2A is a plan view of a speaker according to a second embodiment of the present invention, and FIG. 2B is a structural cross-sectional view of the speaker according to the second embodiment of the present invention.

FIG. 3 is a perspective view of the vicinity of a connection portion of a speaker edge according to a second embodiment of the present invention.

FIG. 4 (a) is a plan view showing the vicinity of a connecting portion of a speaker edge according to a second embodiment of the present invention, and FIG. 4 (b) is a sectional view of each portion in FIG.

FIG. 5 is a sound pressure frequency characteristic diagram of a 14 cm aperture speaker employing the edge of the present invention.

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

FIG. 7 is an explanatory view of a conventional method for improving an edge margin in a speaker.

FIG. 8 is an explanatory diagram of a vibration state of an edge portion of a conventional speaker.

FIG. 9 is a sound pressure frequency characteristic diagram of a conventional 14 cm aperture speaker.

[Explanation of symbols]

 Reference Signs List 5 voice coil 7 cone-shaped diaphragm 10 frame 11, 20 edge 12, 13 convex roll 14, 15 concave roll 16, 17, 18, 19 connecting part

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Tetsuji Koura 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. In-house (56) References JP-A 51-41437 (JP, U) JP-A 60-98996 (JP, U) JP-A 55-91294 (JP, U)

Claims (2)

(57) [Claims] 1. A parabolic curve- shaped cross-section formed by rotating an axis-rotating edge about a central axis, a diaphragm joined to an inner or outer periphery of the edge, and an outer or inner periphery of the edge. A speaker comprising a joined frame. 2. A dividing a circumferential direction into a plurality of pieces, adjacent section of the split pieces are vertically symmetrical structure and the parabolic curved edges, the cross-section between the adjacent split pieces split pieces Characterized by comprising an edge connected by a connecting portion that changes gradually continuously, a diaphragm bonded to the inner or outer circumference of the edge, and a frame bonded to the outer or inner circumference of the edge. Speaker.