JP2002142291A - Loudspeaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a loudspeaker having symmetrical directivity with respect to the center axis of the loudspeaker. SOLUTION: This loudspeaker is provided with a diaphragm 6A which is formed by molding a resin in a symmetrical funnel-like shape with respect to the center axis c of the loudspeaker, lead wires 9 for supplying signals to a voice coil 5 which vibrates the diaphragm 6A through a frame 11 supporting the diaphragm 6A, and dummy wires 12 which are provided to obtain symmetry with respect to the lead wires 9 arranged on the frame 1. The lead wires 9 and dummy wires 12 are arranged on the whole periphery of the frame 11 at regular angular intervals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker having a directional characteristic symmetrical with respect to a center axis of the loudspeaker.

[0002]

2. Description of the Related Art FIG. 4 is a view showing a longitudinal sectional structure of a conventional loudspeaker and a front view thereof, FIG. 5 is a directional characteristic diagram asymmetrical with respect to the center axis of the loudspeaker, FIG.
7 to 9 are directional characteristics diagrams asymmetrical with respect to the center axis of a speaker using a diaphragm obtained by thermoforming a plastic sheet.

As shown in FIG. 4, a conventional speaker includes a yoke 1 having a center pole, a magnet 2, a plate 3, a bobbin 4, a voice coil 5, a diaphragm 6, an edge 7, a dust cap 8, and a lead wire 9. , An input terminal 10 and a frame 11. The above-described diaphragm 6 is manufactured by laminating paper, making paper, vacuum forming a plastic sheet, press forming a metal, or the like.

On the diaphragm 6, a pair of lead wires 9, 9 for supplying an electric signal supplied from the input terminal 10 to the voice coil 5 is arranged on one side (in the direction of arrow A).
The arrangement of the pair of lead wires 9, 9 is shown in FIGS.
As shown in the figure, one of them is arranged in the direction of arrow A or the direction of arrow B.

[0005] As described above, since the pair of lead wires 9 and 9 are arranged on the diaphragm 6 in one direction (Fig. 6A,
(B)), the directional characteristics of the speaker are asymmetric with respect to the center axis c of the speaker (FIG. 5). That is, in the directional characteristics shown in FIG. 5, the characteristics a and b are asymmetric with respect to the central axis c, and the characteristics a and b do not overlap. Here, the characteristic a
Is a speaker using the diaphragm shown in FIG.
This is a directional characteristic of a speaker when a test signal of z is reproduced. A characteristic b is a directivity characteristic of the speaker when a test signal of 10 kHz is reproduced on the speaker using the diaphragm shown in FIG. The directional characteristics c, d, and e shown in FIGS. 7 to 9 are asymmetric with respect to the central axis c. Here, the characteristics c to e are directional characteristics of the speaker when a 10 kHz test signal is reproduced in a speaker using a diaphragm formed by thermoforming a plastic sheet.

[0006]

When stereo reproduction is performed using two speakers having directional characteristics having asymmetry with respect to the center axis of the speakers, the directional characteristics of the speakers vary. Since the variations are not uniform, there is a possibility that sound field localization with a good sense of reality cannot be obtained. The reason for this is that in the conventional speaker production process, only the characteristics on the central axis of the speaker in the single speaker are managed and paid attention to. This is because there is no product management in which the characteristics of a plurality of loudspeakers are aligned to obtain a proper sound field localization.

Accordingly, the present invention provides a diaphragm having a shape symmetrical with respect to the center axis of the speaker, and connects a plurality of lead wires and a plurality of dummy wires at an equal angle over the entire circumference on a frame supporting the diaphragm. With the configuration arranged at intervals, it is possible to manufacture speakers having directional characteristics symmetrical with respect to the center axis of the speaker, and furthermore, by using a plurality of such speakers alone for stereo reproduction, there is no need to make special adjustments and to achieve a sense of realism. It is an object of the present invention to provide a speaker capable of obtaining good sound field localization.

[0008]

In order to solve the above-mentioned problems, the present invention provides the following speaker. That is, as shown in FIGS. 1 and 10 to 13, a diaphragm 6A resin-molded in a shape (a funnel shape) symmetrical with respect to the center axis c of the speaker, and a frame 11 supporting the diaphragm 6A. And a plurality of lead wires 9 for supplying a signal to the voice coil 5 that vibrates the diaphragm 6A, and a plurality of lead wires 9 arranged on the frame 11 for obtaining symmetry with the plurality of lead wires 9. A speaker provided with a dummy wire 12, wherein the plurality of lead wires 9 and the plurality of dummy wires 12 are arranged at equal angles (for example, 90 degrees) over the entire circumference of the frame 11. Speaker.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to FIGS. 1 to 3 and FIGS. FIG. 1 is a diagram showing a longitudinal sectional structure of a speaker according to a first embodiment of the present invention and its front surface, FIG. 2 is a directional characteristic diagram symmetrical with respect to a center axis of the speaker, and FIG. FIGS. 10 to 13 are views showing a longitudinal sectional structure of a speaker according to a second embodiment to a fifth embodiment of the present invention and a front surface thereof, respectively. The same components as those described above are denoted by the same reference numerals, and description thereof will be omitted.

The speaker according to the present invention is shown in FIGS.
As shown in FIG. 3, a yoke 1 having a center pole, a magnet 2, a plate 3, a bobbin 4, a driving coil (voice coil) 5, a cone paper (diaphragm) 6A, an edge 7, a dust cap 8, a lead wire 9, An input terminal 10, a frame 11, a dummy wire 12, mounting terminals 13, 13A, and a suspension 14 are provided. 1 and 10 to 13, when the lead wire 9 and the dummy wire 12 are indicated by broken lines, the lead wire 9 and the dummy wire 12 are provided on the back side of the diaphragm 6A.
Is present. On the other hand, when the lead wire 9 and the dummy wire 12 are indicated by solid lines, it indicates that the lead wire 9 and the dummy wire 12 exist on the surface side of the diaphragm 6A.

The loudspeaker (FIG. 1) according to the first embodiment of the present invention is of a type without a suspension 14, and has a structure in which the lead wire 9 of the voice coil 5 is directly connected to the input terminal 10.

A speaker according to a second embodiment of the present invention (FIG. 1)
0) is a type having a suspension 14, and has a configuration in which the lead wire 9 of the voice coil 5 is directly connected to the input terminal 10.

A speaker according to a third embodiment of the present invention (FIG. 1)
1) has a configuration in which the lead wire 9 of the voice coil 5 is directly fixed to the suspension 14 and then connected to the input terminal 10.

A speaker according to a fourth embodiment of the present invention (FIG. 1)
2) is a type having the suspension 14 and has the following configuration. The lead wire 9 of the voice coil 5 is fixed by wiring so as to crawl on the surface from the inner peripheral side to the outer peripheral side of the diaphragm 6A, and the mounting terminals 13A on the diaphragm 6A are fixed.
Connected to. The mounting terminal 13A protrudes on the back surface of the diaphragm 6A. The mounting terminal 13A on the back surface is connected to one end of another lead wire 9 and the other end is connected to the input terminal 10. Similarly, the dummy wire 12 is fixed by wiring so as to crawl on the surface from the inner peripheral side to the outer peripheral side of the diaphragm 6A, and is connected to the mounting terminal 13A on the diaphragm 6A.
The mounting terminal 13A protrudes on the rear surface of the diaphragm 6A. The mounting terminal 13A on the rear surface is connected to one end of another dummy wire 12, and the other end is connected to the mounting terminal 13.

A speaker according to a fifth embodiment of the present invention (FIG. 1)
3) is a type having a suspension 14, which has a configuration in which the lead wire 9 of the voice coil 5 is fixed by wiring so as to crawl on the back surface of the diaphragm 6A and then connected to the input terminal 10.

The above-mentioned diaphragm 6A is, as described later,
Resin molding is performed using an injection method in which resin is injected from the top, and thereby the uniformity of the shape of the diaphragm is maintained. That is, as shown in FIGS. 1 and 10 to 13, it is possible to obtain the diaphragm 6 resin-molded in a funnel shape symmetrical with respect to the center axis c of the speaker.

The dummy wire 12 is a lead wire having the same dimensions and the same material as the lead wire 9, but does not transmit a signal. The dummy line 12 is for achieving symmetry with the arranged lead wire 9. This dummy wire 12 is attached to the attachment terminal 13 of the frame 11. Thus,
The lead wires 9, 9 and the dummy wires 12, 12 are arranged at equal angle (90 degrees) intervals over the entire circumference of the frame 11.

The loudspeaker of the present invention having the diaphragm 6A symmetrical with respect to the center axis c of the loudspeaker is shown in FIG.
As shown in (1), the speaker has directivity symmetrical with respect to the center axis c of the speaker. That is, each directional characteristic f, shown in FIG.
g and h are symmetric with respect to the central axis c. here,
The characteristics f to g are the directivity characteristics of the speakers when the respective test signals of 8, 9, and 10 kHz are reproduced on the speaker using the diaphragm 6A.

By the way, as described above, the conventional diaphragm 6 inherently has an asymmetric property due to its manufacturing method, so that it is symmetrical with respect to the center axis c of the loudspeaker no matter how precisely it is made. Directional characteristics cannot be obtained. On the other hand, the diaphragm 6A of the present invention is formed by resin molding using an injection method in which resin is injected from the top.
Thereby, the uniformity (symmetry) of the shape of the diaphragm is maintained.

In order to mold the vibration plate 6A with a resin using an injection method, the following steps (1) to (1) are mainly performed.
It is performed in the order of (3). (1) The dies AA and BB, which are male and female dies having the same diameter and the uniform thickness in the circumferential direction, are attached to a molding machine (not shown), and after they are butted together, the resin is injected through the injection hole CC. inject. The mold BB has a top B1. Thereafter, the molds AA and BB are cooled and the injected resin is cured (FIG. 3A). (2) The body 6A2 of the diaphragm 6A is taken out from the molding machine, and the top 6A1 and the unnecessary portions 6A2a and 6A2b are cut and removed. (3) In this way, it is possible to obtain the diaphragm 6A resin-molded in a funnel shape symmetrical with respect to the center axis c of the speaker.

On the other hand, as described above, since the pair of lead wires 9, 9 is arranged in one direction on the diaphragm 6, even if the diaphragm 6A is used, the lead wire 9 is There is a great difference in the directional characteristics between the one projected in the direction and the one projected in the horizontal direction (lateral direction).

In a normal speaker, one
The mounting direction in which the pair of lead wires 9 and 9 are mounted is controlled to be constant. In most cases, the mounting direction is in the vertical direction (that is, the mounting direction of the lower dummy wire 12 shown in FIG. 1). No problem occurs in the symmetry in the horizontal direction (that is, the mounting direction of the lead wire 9 shown in FIG. 1) by the lead wires 9 and 9. However, since the radiation area becomes narrow and the directivity in the vertical direction becomes asymmetric, a great influence is exerted on the feeling of atmosphere such as the spread of sound.

In order to solve the above problem, a dummy wire 12 which is a dummy lead wire is provided for the purpose of balancing in addition to the lead wire 9 added for applying an electric signal, and the dummy wire 12 is arranged with respect to the center axis of the speaker. Ensure vertical and horizontal symmetry. The greater the number of the dummy lines 12, the better. However, it is necessary to prevent the weight of the vibration system of the speaker from being increased and to prevent the movement in the center axis direction. In the embodiment of the invention shown in FIG.
Are arranged at intervals of 90 degrees in the radial direction, of which two lead wires 9, 9 are used for applying an electric signal, and two dummy wires 12, 12 are used to secure the symmetry thereof. I have.

Although not described in detail here, the dust cap 8 may be formed by resin molding using the same injection method as that of the diaphragm 6A.

[0025]

As described in detail above, the present invention comprises a diaphragm having a shape symmetrical with respect to the center axis of the speaker, and a plurality of lead wires and a plurality of leads extending all around the frame supporting the diaphragm. With dummy lines arranged at equal angular intervals, speakers with directional characteristics symmetrical with respect to the center axis of the speaker can be manufactured, and special adjustments can be made simply by using a plurality of such speakers for stereo playback. It is possible to provide a loudspeaker capable of obtaining sound field localization with a good sense of reality without any problem.

[Brief description of the drawings]

FIG. 1 is a diagram showing a longitudinal sectional structure of a speaker according to a first embodiment of the present invention and a front surface thereof.

FIG. 2 is a directional characteristic diagram symmetrical with respect to a center axis of a speaker.

FIG. 3 is a diagram for explaining a manufacturing process of the diaphragm.

FIG. 4 is a diagram showing a vertical cross-sectional structure of a conventional speaker and a front surface thereof.

FIG. 5 is a directional characteristic diagram asymmetrical with respect to a center axis of a speaker.

FIG. 6 is a layout diagram of lead wires on a diaphragm.

FIG. 7 is a directional characteristic diagram asymmetrical with respect to a center axis of a speaker using a diaphragm formed by thermoforming a plastic sheet.

FIG. 8 is a directional characteristic diagram asymmetrical with respect to a central axis of a speaker using a diaphragm obtained by thermoforming a plastic sheet.

FIG. 9 is an asymmetric directional pattern with respect to a center axis of a speaker using a diaphragm formed by thermoforming a plastic sheet.

FIG. 10 is a diagram showing a longitudinal sectional structure of a speaker according to a second embodiment of the present invention and a front surface thereof.

FIG. 11 is a view showing a longitudinal sectional structure of a speaker according to a third embodiment of the present invention and a front surface thereof.

FIG. 12 is a diagram showing a longitudinal sectional structure of a speaker according to a fourth embodiment of the present invention and a front surface thereof.

FIG. 13 is a view showing a longitudinal sectional structure of a speaker according to a fifth embodiment of the present invention and a front surface thereof.

[Brief description of reference numerals]

 5 Voice coil 6, 6A diaphragm 9 Lead wire 11 Frame 12 Dummy wire c Central axis

Claims (1)

[Claims] 1. A plurality of diaphragms, which supply a signal to a voice coil that vibrates the diaphragm, via a diaphragm that is resin-molded in a shape symmetrical with respect to a center axis of the speaker, and a frame that supports the diaphragm. A speaker, comprising: a lead wire; and a plurality of dummy wires arranged on the frame and configured to take symmetry with the plurality of lead wires, wherein the plurality of leads extend over the entire circumference of the frame. A loudspeaker wherein lines and the plurality of dummy lines are arranged at equal angular intervals.