JP4220422B2 - Equalizer and speaker device provided with equalizer - Google Patents

Description

  The present invention relates to an equalizer that is attached in front of a diaphragm of a speaker unit to give a certain change in directivity, sound pressure, frequency characteristics, and the like of the speaker unit, and a speaker device that includes the equalizer.

As a speaker device, for example, woofer for low range, for midrange squawker, respectively provided a tweeter for high frequency range, by performing reproduction by a dedicated speaker units for each band, high over a wide range There is a multi-way speaker device that realizes reproduction of quality.

  However, when using a plurality of speaker units having different reproduction bands in this way, if there is a large difference in directivity, output sound pressure level, frequency characteristics, etc., between each speaker unit, for example, depending on the position to audition, There is an inconvenience that some band sounds cannot be heard, or some band sounds are too strong and irritating.

Therefore, in order to reduce the difference in directivity, output sound pressure level, frequency characteristics, etc. between the speaker units, it is necessary to adjust these output characteristics for each speaker unit.
The adjustment of the output sound pressure level and the frequency characteristic can also be performed by providing an amplifier circuit that adjusts the reproduction signal in an amplifier device that outputs the reproduction signal to the speaker unit.
However, the directivity cannot be adjusted by electrical processing using an equalizer circuit.

  Therefore, normally, for a speaker unit having strong directivity such as a tweeter, an equalizer (also called a diffuser) for adjusting directivity and sound pressure is provided in front of the diaphragm 3 of the speaker unit 1 as shown in FIG. Equipped with 5). In FIG. 1, reference numeral 6 denotes an edge that fixes the outer periphery of the diaphragm 3 to the frame 7 of the speaker unit 1.

  The illustrated equalizer 5 shields a part of the area in front of the diaphragm 3 with a plurality of crosspieces 5a, and reflects, diffuses, and absorbs sound by these crosspieces 5a, thereby directivity, sound pressure, and frequency. Adjust the characteristics.

Conventionally, as such an equalizer 5, a structure for fixing the frame 7 of the speaker unit 1 that supports the magnetic circuits by screwing or adhesion or the like, have been developed (e.g., Patent Document 1 See diffuser).

Japanese Patent Laid-Open No. 10-079995

However, when a speaker device equipped with the above-described fixed equalizer 5 is installed in a tweeter, there are many cases in which it is desired to further change the directional characteristics of the tweeter depending on the shape of the room.
In such a case, the fixed equalizer 5 cannot cope with this, and therefore, usually the installation direction of the speaker device itself is adjusted or the installation position of the speaker device is moved. However, such an adjustment method is not easy when the speaker device is large, and also causes deterioration of the fit of the speaker device in a room or the like.

  Therefore, conventionally, as shown in FIG. 2, the tweeter 9 equipped with the equalizer 5 in front of the diaphragm 9a has a universal unit whose direction can be freely changed as indicated by arrows A, B and C in the figure. It has been proposed that a directivity can be made variable by installing a joint-type rotation support base 11 and attaching it to a cabinet (enclosure) of the speaker device via the rotation support base 11.

  However, the provision of the rotation support base 11 causes an increase in cost, and at the same time, the rotation support base 11 itself having a movable part may become a noise generation source that generates noise due to resonance, although it is slight. It was.

  The problem to be solved by the present invention is that the adjustment of directivity by a fixed equalizer that occurs in the above-described prior art is not variable, and the directivity cannot be changed later according to the installation environment, As an example, there are problems in that if a rotation support base is provided in order to make the directivity of the speaker unit variable, the cost increases, and at the same time, it is disadvantageous in reducing noise due to resonance.

The speaker device according to claim 1 is an equalizer that is attached in front of a diaphragm of the speaker unit and gives a certain change in directivity, sound pressure, frequency characteristics, etc. of the speaker unit, and is provided outside the front surface of the speaker unit. A permanent magnet is provided in a ring portion to be brought into contact with a peripheral edge, and the permanent magnet is located on the outer side in the radial direction of the magnetic gap of the speaker unit and the voice coil, and viewed in the axial direction of the speaker unit. so as to overlap the magnet partially constituting the magnetic circuit, said detachably fixed to the frame of the speaker unit across the peripheral edge portion of the diaphragm, whereby the permanent magnet of the magnetic gap by the magnet It is characterized by changing the magnetic flux density .

  A speaker device according to a second aspect is a speaker device in which the equalizer according to the first aspect is attached to a front surface of a speaker unit, and the front surface of the diaphragm is interposed between the equalizer and the diaphragm of the speaker unit. Equipped with a protective net covering.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of an equalizer and a speaker device including the equalizer according to the invention will be described in detail with reference to the drawings.
FIG. 3 shows a longitudinal sectional view of an embodiment of a speaker device provided with an equalizer according to the present invention.

  The speaker device 21 of this embodiment is equipped with an equalizer 25 on the front surface of a dome-shaped speaker unit 23 used as a tweeter for a high sound range, and between the diaphragm 27 and the equalizer 25 of the speaker unit 23. Is equipped with a protective net 29.

  The speaker unit 23 includes a dome-shaped diaphragm 27 described above, a cylindrical voice coil 31 connected to the outer peripheral edge of the diaphragm 27, and a magnetic circuit 35 having a magnetic gap 33 that accommodates the voice coil 31. And a magnetic frame 37 that supports the magnetic circuit 35 and the diaphragm 27.

  An edge 38 is joined to the outer periphery of the diaphragm 27, and the outer peripheral edge of the edge 38 is supported by the frame 37 by being fixed to the edge support portion 37 a of the frame 37.

The magnetic circuit 35 includes a columnar center pole 35a disposed on the back side of the speaker unit 23, a first plate 35b formed by projecting the outer periphery of the base end of the center pole 35a in a bowl shape, and the first plate. An inner circumference of the second plate 35d, which includes an annular magnet 35c disposed on the upper surface 35b and an annular second plate 35d placed on the magnet 35c so as to face the first plate 35b. A gap between the surface and the outer peripheral surface of the center pole 35 a is a magnetic gap 33 that accommodates the voice coil 31 .
The magnetic circuit 35 described above forms an external magnet type magnetic circuit that concentrates the magnetic flux in the magnetic gap 33, and the voice coil 31 is moved in the central axis direction indicated by the arrow Y in accordance with an electric signal input to the voice coil 31. To drive.

The equalizer 25 includes an equalizer main body 41 made of a synthetic resin and a permanent magnet 43 that is bonded and fixed to the equalizer main body 41.
As shown in FIG. 4, the equalizer main body 41 includes a substantially circular top plate portion 41a covering the front of the diaphragm 27, a plurality of connection arms 41b extending radially from the outer periphery of the top plate portion 41a, and each connection arm. A ring portion 41c is integrally formed with the front peripheral edge (in the illustrated example, the edge support portion 37a) coupled to the tip of 41b.

  As shown in FIG. 3, the permanent magnet 43 is attached to the back surface of the ring portion 41c, and fixes the equalizer body 41 to the frame 37 in a detachable manner.

In the equalizer 25 described above, the top plate portion 41a and the connecting arm 41b disposed in front of the diaphragm 27 work on the reflection, diffusion, attenuation, etc. of the sound generated from the diaphragm 27, and the directivity of the speaker unit 23, A certain change is given to sound pressure, frequency characteristics, etc.
In the case of the present embodiment, an appropriate inclined surface (twist) is provided on the surface of the top plate portion 41a and the connecting arm 41b so that the directivity changes by rotating the equalizer 25 relative to the frame 37. Good.

  In addition, the permanent magnet 43 for fixing to the frame 37 is equipped with the magnetic circuit 35 so that the magnetic circuit 35 has the same magnetic pole as that of the magnet 35c constituting the magnetic circuit 35 or is installed in the opposite direction. The magnetic flux density formed in the magnetic gap 33 can be changed, and this can be used for adjusting the sensitivity of the voice coil 31 in amplitude operation (that is, adjusting the sound pressure level).

The protective net 29 is interposed between the equalizer 25 and the diaphragm 27 so as to cover the front surface of the diaphragm 27.
The protective net 29 is made of a mesh material that allows sound to pass through without affecting the sound as much as possible, but if necessary, the material, In consideration of the size of the mesh opening or the like, it may be used as an auxiliary to the equalizer 25.
However, since the original purpose of the protective net 29 is to protect the diaphragm 27, it is desirable to use a material having a certain degree of rigidity.

The equalizer 25 described above is detachably fixed to the speaker unit 23 by a permanent magnet 43, and is attached to the diaphragm 27 of the speaker unit 23 by rotating around the center axis of the diaphragm 27. By changing, the directivity and the like can be changed, and it can be easily attached and detached. Therefore, the adjustment of directivity and sound pressure can be greatly changed by recombining with other equalizer 25 whose specifications have been changed. You can also.
In other words, the tweeter directivity and sound pressure adjustment can be made variable without incorporating a costly rotary support stand or the like as in the prior art, and the directivity and sound pressure adjustment degree can be adjusted to the installation environment of the speaker device. In addition, the equalizer 25 and the speaker device that can be easily changed later and are easy to use for the user can be provided.

  Further, in the speaker device 21 of the present embodiment, the adjustment of the directivity and sound pressure by the equalizer 25 is adjusted to the installation environment of the speaker device 21 by changing the mounting direction of the equalizer 25, replacing the equalizer 25, or the like. Since the front surface of the diaphragm 27 is covered with the protective net 29 when the equalizer 25 is removed from the speaker unit 23 by replacing the equalizer 25 or the like, the diaphragm is inadvertently changed. It is possible to prevent the diaphragm 27 from being damaged by touching the hand.

The speaker unit equipped with the equalizer of the present invention is not limited to a dome type speaker. The present invention can also be applied to a cone type speaker or an oval type speaker using an oval diaphragm.
A speaker that adjusts directivity, sound pressure, and frequency characteristics by the equalizer of the present invention is not limited to the tweeter described in the above embodiment.
Furthermore, the present invention can be applied to a super tweeter for reproducing only a limited range of the high sound range, a squawker for performing reproduction to a relatively high sound range, and the like.

It is a perspective view of the speaker unit provided with the conventional equalizer. It is a perspective view which shows the support structure of the tweeter which uses the conventional equalizer. It is a longitudinal cross-sectional view of one Embodiment of the speaker apparatus provided with the equalizer which concerns on this invention. FIG. 4 is a rear view of the equalizer shown in FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 21 Speaker apparatus 23 Speaker unit 25 Equalizer 27 Diaphragm 29 Protection net 31 Voice coil 33 Magnetic gap 35 Magnetic circuit 37 Frame 37a Edge support part 38 Edge 41a Top plate part 41b Connection arm 41c Ring part 41 Equalizer main body 43 Permanent magnet

Claims (3)

An equalizer that is attached in front of a diaphragm of a speaker unit and gives a constant change to directivity, sound pressure, frequency characteristics, etc. of the speaker unit,
A ring magnet that is in contact with the outer peripheral edge of the front surface of the speaker unit is equipped with a permanent magnet, and the permanent magnet is located outside the magnetic gap of the speaker unit and the voice coil in the radial direction and in the axial direction of the speaker unit. viewed so as to overlap the magnet partially constituting the magnetic circuit of the speaker unit, is detachably fixed to the frame of the speaker unit across the peripheral edge portion of the diaphragm, whereby the said permanent magnets magnet An equalizer characterized in that the magnetic flux density of the magnetic gap is changed . A speaker device in which the equalizer according to claim 1 is attached to a front surface of a speaker unit,
A speaker device comprising a protective net that covers a front surface of the diaphragm between the equalizer and the diaphragm of the speaker unit. A speaker device in which the equalizer is attached to the front surface of the speaker unit,
An inclined surface (twist) that changes the directivity of the speaker unit by changing the mounting angle around the central axis when the equalizer is fixed to the frame of the speaker unit is provided on the front surface of the equalizer. The speaker device according to claim 2.