JP3102741B2 - Speaker unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker unit for high frequencies, and more particularly to a loudspeaker unit having improved sound field control and mountability.

[0002]

BACKGROUND OF THE INVENTION In the speaker unit for medium conventionally low range, as shown in the side view and a bottom view shown in FIG. 3 (B) of FIG. 3 (A), to improve the attachment of the elongate portion, etc. In some cases, the shapes of the diaphragm 11 and the magnetic circuit portion 13 are elliptical or elliptical. In the figure, reference numeral 12 denotes a frame.

In such an elliptical or elliptical speaker unit for the middle and low frequencies, a terminal plate 14 for inputting a signal usually has a positive terminal 15 and a negative terminal 1.
6 are integrally mounted on the same side of the frame 12. In such a speaker unit for the middle and low frequencies, the size of the diaphragm 1 is larger than the size of the terminal plate 14.
Since other members such as 1 are large, the terminal plate 14 does not protrude from the width in the minor diameter direction of these members, and there is no problem in mounting.

Also, it is technically difficult to dispose the voice coil on the voice coil bobbin by integrally forming the diaphragm 11 with the voice coil bobbin and the center cap portion. Was attached.

On the other hand, looking at a conventional elliptical horn,
The elliptical horn was attached to a circular diaphragm, so that the throat of the horn was circular and the opening was elliptical.

[0006]

As described above, the size of the terminal plate 14 does not matter so much in the speaker unit for the middle and low frequency ranges, but the elliptical shape having the short diameter of 30 mm or less or the long shape is not important. If you want to get a circular high frequency speaker unit ,
The size of the terminal board cannot be ignored compared to the size of the diaphragm or magnetic circuit part, and it will protrude from the width of the minor axis direction at the conventional terminal board shape and terminal shape or its mounting position. A problem arises in the attachment property, and the advantage of the elliptical speaker unit which is originally made into an elliptical shape in consideration of the attachment property to a slender portion or the like cannot be fully utilized.

Also, since the voice coil bobbin and the center cap are separately mounted, the number of assembly steps increases,
The assembling work is troublesome, and the voice coil bobbin has an elliptical shape, so the strength in the short diameter direction is particularly weak.
There was a problem on strength.

Further, regarding the elliptical horn, since the circular shape of the throat is made elliptical in the opening surface, the wavefront is considerably distorted, and there is a problem particularly when the ratio of the minor axis to the major axis of the ellipse is large. If it is suddenly changed from the throat base 1 to the opening 2 to 1, the change in the wavefront becomes too large, which is not preferable in terms of performance.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional drawbacks, to improve the mountability without protruding the terminal plate from the short diameter direction, and to improve the sound quality by increasing the strength of the voice coil bobbin, thereby improving the sound quality. An object of the present invention is to provide a speaker unit capable of minimizing wavefront disturbance in a horn.

[0010]

In order to achieve the above object, according to the present invention, a magnetic circuit unit including a magnet, a voice coil, and a diaphragm each have an elliptical shape having no linear portion. The terminal board for signal input is configured to fit within the width in the minor axis direction, and the diaphragm adjusts its minor axis.
With a size to within 30 mm, or is integrally molded include voice coil bobbin unit and a center cap portion is integrally molded with at least a voice coil bobbin unit, the voice coil is dropped to the voice coil bobbin unit which is molded into a groove shape With such a configuration, it is formed as a single speaker for high frequencies.

In the elliptical horn, the diaphragm is made elliptical, and an elliptical horn whose throat is already elliptical is attached to the diaphragm. Thereby, disturbance of the wavefront can be minimized.

By using two speaker units to which the elliptical horns are attached as described above and making the magnetic circuit portions of both speaker units back to back, a speaker having a bidirectional characteristic is obtained.

[0013]

The terminal board and the terminal can be miniaturized to the required minimum, and the terminal board can be prevented from protruding by integrating the terminal board with the frame portion. In addition, even if a terminal having a conventional size is provided in such a manner that the plus side and the minus side are separately provided in the long diameter direction, the protrusion can be made only in the long diameter direction, and it is possible to cope with attachment to a long and narrow portion.

The diaphragm is the latest NC (Num) if it is for an elliptical or oval speaker having a minor axis of 30 mm or less.
By using a mechanical processing technique based on an electrical control, an integral molding with a voice coil bobbin portion and a center cap portion is possible. If the diaphragm is formed integrally with at least the voice coil bobbin in this way, the structural strength can be increased by the bending effect and the rib effect by the integration.

Further, if the diaphragm, the voice coil bobbin and the center cap are integrally formed and the voice coil is dropped into the voice coil bobbin formed in a groove shape, the bending effect and the rib effect of the voice coil bobbin can be achieved. Further, the strength of the structure can be increased by bonding both sides of the voice coil to the voice coil bobbin, and the strength in the short diameter direction which is a problem when the voice coil bobbin is separately attached as in the related art. Shortage can be improved. Thereby, distortion and reliability due to deformation of the voice coil bobbin can be improved, and the number of assembly steps can be reduced and labor can be saved at the same time.

Further, with respect to the elliptical horn, the elliptical horn can be acoustically attached without difficulty by using the elliptical diaphragm. The conventional elliptical horn has a circular diaphragm (three-to-one) because the diaphragm is circular, and gradually deforms it to realize a three-to-two ellipse at the opening. By using this, it is possible to form an elliptical shape from the throat portion, so that a change in the wavefront is small and an excellent acoustic effect can be expected. An elliptical horn with a large ratio of minor axis to major axis (aspect ratio), which was difficult with a circular diaphragm, can be realized without difficulty, and the difference between the directivity characteristics in the minor axis direction and the major axis direction can be increased. Can be realized with higher accuracy.

In addition, by using two speaker units to which the elliptical horn is attached and configuring the magnetic circuit units back to back, a bi-directional speaker with extremely sharp directivity can be realized, and the sound field control can be extremely simplified. It will be effective.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a speaker unit according to the present invention will be described with reference to FIGS. 1A and 1B show a high frequency elliptical speaker unit, wherein FIG. 1A is a plan view and FIG. 1B is a half sectional side view. FIG. 2 shows a speaker in which an elliptical horn is attached to the speaker unit of FIG. 1, (A) is a plan view,
(B) is a half sectional side view.

In the drawing, reference numeral 1 denotes a voice coil bobbin 1
a and a center cap portion 1b. The voice coil 1c is dropped and adhered to a voice coil bobbin portion 1a formed in a groove shape, and the diaphragm 1 is attached to the magnetic circuit portion 3. Frame 2 fixed. In addition, the terminal plate 4 is downsized so that the frame 2
The terminal 5 is fixed to the terminal plate 4.

In the above configuration, both the diaphragm 1 and the magnetic circuit portion 3 have a regular ellipse having a ratio of the major axis to the minor axis of 3 to 2. As is clear from the drawing, the terminal board 4 is in the minor axis direction. It is configured without protruding from the width of.

Since the diaphragm 1 is integrally formed including the voice coil bobbin 1a and the center cap 1b, the strength is increased by the bending effect and the rib effect of the voice coil bobbin 1a. Further, by dropping the voice coil 1c into the voice coil bobbin 1a and bonding the voice coil 1c, the voice coil 1c is firmly fixed to the wall surfaces on both sides of the voice coil bobbin 1a. Therefore, the lack of strength in the minor axis direction of the elliptical voice coil is greatly improved, and distortion and reliability due to deformation of the voice coil bobbin can be improved, and sound quality can be improved. Also, since the voice coil bobbin 1a is not a separate member, the voice coil 1
The mounting and positioning of c become easy, and the assembly process can be simplified and labor can be saved.

FIG. 2 shows a horn 6 in the speaker unit of FIG.
Is attached. In this horn 6, the elliptical shape of the throat base is a regular 3: 2 ellipse according to the diaphragm,
The opening is configured to have a two-to-one regular ellipse. In the figure, 8 is an equalizer, and 7 is a support member. As described above, since the shape of the throat of the horn is originally elliptical, the horn opening can be set to a considerably extreme elliptical shape without greatly disturbing the wavefront, and the directivity can be set in the vertical and horizontal directions (minor diameter direction, major diameter direction). Direction) can be obtained, and the effect in controlling the sound field is great.

Further, by using two speaker units with a horn shown in FIG. 2 so that the magnetic circuit portions of both speaker units are back-to-back to obtain a bi-directional characteristic, a bi-directional characteristic with extremely sharp directivity is obtained. A speaker can be realized, which is extremely effective in sound field control. In this case, not only is the case where the magnetic circuit sections are turned 180 ° to be completely back-to-back, but also the direction of the bidirectionality can be changed appropriately by tilting the magnetic circuit sections at about 150 ° and back-to-back.

[0024]

According to the present invention , an elliptical speaker unit for high frequencies can be obtained. In addition, since the diaphragm is integrally molded with the voice coil bobbin and the voice coil is dropped into the voice coil bobbin molded into a groove shape, the strength of the voice coil bobbin becomes extremely high, so that sound quality can be improved and assembly can be performed. The process can be simplified and labor can be saved.

Further, since the terminal plate does not protrude from the short diameter direction, it is extremely advantageous when the terminal plate is attached to a long and thin portion. Furthermore, since the elliptical horn can be fitted with an elliptical horn that is made elliptical from the throat, the disturbance of the wavefront in the elliptical horn can be minimized, and the aspect ratio of the ellipse in the opening is increased. A long and thin elliptical horn can also be realized, and a directional loudspeaker having extremely different vertical and horizontal directional characteristics can be obtained, and extremely special control over sound field control is possible.

[Brief description of the drawings]

1A and 1B show an embodiment of a speaker unit according to the present invention, wherein FIG. 1A is a plan view and FIG. 1B is a half sectional side view.

2A and 2B show a speaker unit to which an elliptical horn is attached. FIG. 2A is a plan view, and FIG. 2B is a half sectional side view.

3A and 3B show a conventional middle and high frequency elliptical speaker unit, wherein FIG. 3A is a side view and FIG. 3B is a bottom view.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Diaphragm 1a Voice coil bobbin part 1b Center cap part 1c Voice coil 2 Frame 3 Magnetic circuit part 4 Terminal plate 5 Terminal 6 Horn 7 Support member 8 Equalizer

Continuation of the front page (56) References JP-A-55-21620 (JP, A) JP-A-5-55692 (JP, U) JP-A-58-144493 (JP, U) JP-A 64-11097 (JP) , U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04R 9/04 H04R 9/04 105 H04R 1/30 H04R 9/02

Claims (4)

(57) [Claims] 1. A magnetic circuit unit including a magnet, a voice coil, and a diaphragm each have an elliptical shape having no linear portion, and a terminal plate for signal input is configured to fit within a width in a minor diameter direction. is, the diaphragm, the size of the short diameter within 30mm
With certain, either integrally molded include voice coil bobbin unit and a center cap portion is integrally molded with at least a voice coil bobbin unit, the voice coil is constructed as dropped in the voice coil bobbin unit which is molded into a groove shape By doing
A speaker unit formed as a single speaker for high frequencies. 2. The speaker unit according to claim 1, wherein an elliptical horn is attached to the speaker unit. 3. The loudspeaker according to claim 2, wherein the horn is configured such that the ratio of the major axis to the minor axis of the opening and the ratio of the major axis to the minor axis of the throat are 1.3 times or more. unit. 4. A speaker comprising two loudspeaker units to which an elliptical horn according to claim 2 or 3 is attached, wherein the magnetic circuit portions of both loudspeaker units are back-to-back to obtain a bidirectional characteristic. A speaker unit characterized by the above-mentioned.