JPS6320080B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electrodynamic speaker having an elliptical or rectangular diaphragm having a uniaxially narrow configuration.

Conventional configurations and their problems In general, electrodynamic loudspeakers with elliptical or rectangular diaphragms have a ring-shaped magnet placed in the center of a field section that has a top plate and a bottom plate fixed above and below with a ring-shaped magnet in between. A magnetic air gap is formed, and a voice coil bobbin with a voice coil wound therein is suspended via a wave damper between a frame fixed to a top plate constituting the field section, and the voice coil bobbin is The outer periphery of the elliptical or rectangular diaphragm, the inner periphery of which is fixed, is supported by the frame via an edge member. However, in the electrodynamic speaker described above, the outer diameter of the damper is limited to the short diameter of the oval or rectangular speaker, so a large damper cannot be used. There was a problem in that the displacement of the diaphragm could not be linearly followed with respect to the driving force up to the amplitude range, making it impossible to reproduce deep bass with high fidelity. As a method for solving the above problems, a damper is constructed in which a square cylinder with a rectangular cross section is provided around a polygonal central support part, and a square cylinder is provided in the short diameter direction of an elliptical or rectangular speaker. Attempts have been made to narrow the width and improve the poor linearity by increasing the height of the rectangular cylinder or by using anisotropic materials, but the length in the minor axis direction includes the outer peripheral support. Since the length of the diaphragm is not very short, it is difficult to follow the displacement of the diaphragm with good linearity.

OBJECTS OF THE INVENTION It is an object of the present invention to achieve large amplitude and high fidelity in speakers such as elliptical speakers and rectangular speakers, where the damper insertion location in the frame has plenty of room in the major diameter direction and is narrow in the minor diameter direction. The purpose of the present invention is to provide an electrodynamic speaker that can reproduce deep bass sounds.

Structure of the Invention The electrodynamic speaker of the present invention includes a damper that suspends a voice coil bobbin provided on the inner circumference of an elliptical or rectangular diaphragm, and a central support part of an even polygon shape into which the voice coil bobbin is inserted and fixed. , a bendable Noh mask rectangular square cylinder connected to the outer periphery of this central support part via a bending part, and an outer periphery support part connected to the outer periphery of this square cylinder via a bending part. The square cylinder body and the outer circumferential support portion are arranged within the width of the center support portion in the minor axis direction. According to this configuration, the rectangular cylinders having strength against torsion are arranged adjacent to each other around the outer periphery of the polygonal central support part such as a rhombus to prevent the central support part from tilting, and also to prevent the central support part from tilting. Amplitude linearity can be improved by changing the shape.
Then, the short diameter of the electrodynamic speaker is set as the rectangular cylinder.
By using a damper with a polygonal central support part such as a rhombus that matches the long diameter, it is possible to improve amplitude linearity in elliptical or rectangular electrodynamic speakers, resulting in high-fidelity reproduction including deep bass. can be realized.

DESCRIPTION OF EMBODIMENTS FIGS. 1 to 3 show an embodiment of the present invention. In the figures, the field part fixes a ring-shaped magnet 3 on the bottom plate 2, and also attaches a top plate on the ring-shaped magnet 3. A plate 4 is fixed thereto, and an annular magnetic gap 5 is provided in the center. A voice coil 7 is wound around a voice coil bobbin 6 in this magnetic gap 5 and suspended by a damper 8. On the other hand, the outer peripheral portion of the damper 8 is attached to a frame 9 fixed to the top plate 4. The inner diameter side of the diaphragm 1 is attached to the voice coil bobbin 6, and the outer diameter side is attached to the upper end of the frame 9 via an edge 10 provided around the diaphragm. Here, the damper 8
is a material such as wire cloth impregnated with thermoplastic resin.
It is constructed as shown in FIG. 3 and FIG. That is, the damper 8 has a polygonal central support portion 12 having a hole 11 for inserting and fixing the voice coil bobbin on the inner diameter side. Outer periphery 13 of central support portion 12
-a, 13-b, 13-c, 13-d through bent portions (in this embodiment, the outer periphery acts as the bent portion)
-b, 14-c, 14-d are adjacent common points
It is arranged with AB, BC, CD, and DA.
The above square cylinder bodies 14-a, 14-b, 14-c, 1
4-d is an end surface 16- which is inclined so as to be disposed inside the width of the diagonal length W of the central support portion 12.
a, 16-b, 16-c, and 16-d. The outer peripheral support portions 17-a and 17-b are connected to the square cylinder body 14.
-bending part 1 on -a, 14-b, 14-c, 14-d
They are connected via 5-a, 15-b, 15-c, and 15-d. In order to realize these configurations, the above-mentioned materials are molded separately for the upper side and the lower side and then bonded together. The outer peripheral support portions 17-a and 17-b are fixed to the frame.

The operation of the damper of the elliptical or rectangular electrodynamic speaker according to the present embodiment configured as described above will be described below. When a driving force in the direction of the vibration axis is generated in the voice coil, the square cylinder 14 with a rectangular cross section
-a, 14-b, 14-c, and 14-d are deformed into rhombic cross sections, and the central support portion 12 is displaced in the vibration axis direction. Furthermore, when a driving force that is tilted with respect to the vibration axis acts on the voice coil 7, the damper 8 exhibits a resistance force against it, causing the voice coil to hit the wall of the magnetic gap 5 in the field section and generate abnormal noise. I have to try not to do that. FIG. 4 shows a perspective view of the damper, and when a rotational force as shown by arrow F in FIG. 4 is applied, the following rotational force is generated around the outer periphery of the central support portion 12. That is, the outer periphery 13-
A has a negative rotational force at the common point DA, a positive rotational force at AB,
Also, positive at the common point AB of the outer periphery 13-b, negative at BC,
A positive rotational force is generated at the common point BC of the outer periphery 13-c, a negative rotational force is generated at the common point CD, a negative rotational force is generated at the common point CA of the outer periphery 13-d, and a positive rotational force is generated at the common point DA. Positive and negative rotational forces are acting at the common point BC, but these are caused by the square cylinders 14-a to 14-
Since d is placed adjacent to each other, it is canceled out. The same applies to the DA point. Since rotational forces in the same direction are applied to points AB and CD, a positive rotational force is applied to the central support portion 12 at AB and a negative rotational force at CD. AB, BC, CD, DA are made of square cylinders that have torsional strength against these rotational forces.
By arranging them in a shape having a common point, the above rotational force can be prevented. End portion 16-a, 1 of square cylinder
Although 6-b, 16-c, and 16-d have the above common points, even if they are removed obliquely so that they can be arranged within the diagonal length W of the central support part, the torsional strength of the square cylinder remains effective without much difference. act. Therefore, according to this embodiment, the square cylinders are adjacent to and connected to the central support part so that they have a common point, and the square cylinders and the outer peripheral support part are installed within the width of the diagonal length. As a result, even in electrodynamic speakers such as ellipsoids or rectangles, where the damper is narrow in the short diameter direction, the damper has excellent amplitude linearity and can reproduce powerful deep bass with high fidelity. becomes possible.

FIG. 5 is a plan view of a damper of an elliptical or rectangular electrodynamic speaker showing a second embodiment of the present invention, and FIG. 6 is a partial cross-sectional side view thereof. In the figure,
Components similar to those in FIG. 3 are given the same reference numerals.
The difference from Fig. 3 is that when the width W' in the short axis direction is even narrower, the square cylinder has a common point AB in the long axis direction,
Although it has CD, it cannot have a common point in the minor axis direction and is separated from A, B, C, and D. Therefore, when a rotational force F as shown in Fig. 4 is applied, the central support part 12 bends at the center line _l1 in the minor axis direction to generate opposite rotational forces at A and D and B and C. . This causes the voice coil to tilt and generate abnormal noise. Therefore, reinforcing ribs 18-a and 18-b are provided between B and C and between A and D to transmit rotational force.
This prevents bending at the center line _l1 , creating a damper with good linearity even in the large amplitude range. According to this embodiment, it is effective in the case where the damper padding portion in the minor axis direction is even narrower.

Effects of the Invention As detailed above, according to the present invention, a rectangular cylinder with a rectangular cross section that is bendable is disposed around the outer periphery of the central support portion into which the voice coil is inserted and fixed, and the rectangular cylinder is placed in the center. Since the damper is removed diagonally so that it can be arranged within the width of the diagonal length of the support part, and furthermore, the outer peripheral support part is provided around the outer periphery of the cylindrical part of the square cylinder, there is no mounting allowance for the damper in the long diameter direction. To enable an elliptical or rectangular electrodynamic speaker, which has ample space in the center but is narrow in the minor diameter direction, to follow with good linearity up to a large amplitude region, and to prevent rotational force acting on a voice coil. Can be done. This has the advantage that it is possible to realize an excellent elliptical or rectangular electrodynamic speaker that can reproduce powerful deep bass with high fidelity.

[Brief explanation of the drawing]

Fig. 1 is a side half-sectional view showing an embodiment of the electrodynamic speaker of the present invention, Fig. 2 is a plan view of the damper of the speaker, and Fig. 3 is an A-B-O-C cross-sectional view thereof. FIG. 4 is a perspective view of the same damper, FIG. 5 is a plan view showing another embodiment of the damper, and FIG. 6 is an A-B-O-C cross-sectional view thereof. 2... Bottom plate, 3... Ring-shaped magnet, 4... Top plate, 5... Magnetic gap,
6...Voice coil bobbin, 7...Voice coil, 8...Damper, 9...Frame, 1...Diaphragm, 10...Edge, 11...Voice coil insertion hole, 12...Central support part, 13- a, 13-
b, 13-c, 13-d...Outer periphery of the central support part, 14-a, 14-b, 14-c, 14-d...
...square cylinder, 15-a, 15-b, 15-c, 1
5-d...outer periphery of square cylinder, 16-a, 16-
b, 16-c, 16-d... end of square cylinder, 1
7-a, 17-b...Outer peripheral support part, 18-a, 1
8-b...Reinforcement rib.

Claims (1)

[Claims] 1. An elliptical or rectangular diaphragm whose outer periphery is supported by a frame via an edge member and whose inner periphery is provided with a voice coil bobbin, and a damper which supports the voice coil bobbin on the frame,
The damper is connected to a central support portion in which a hole into which the voice coil bobbin is inserted and fixed is formed, and a bent portion to the outer periphery of the central support portion,
It has a plurality of bendable and extensible square cylinders with a rectangular cross section arranged symmetrically with respect to the hole, and an outer peripheral support part connected to the outer periphery of the cylindrical part of the square cylinders via a bending part. However, the square cylinder is installed diagonally with respect to the outer periphery of the outer peripheral support part, and arranged so that the cut of the square cylinder, which is diagonal with respect to the length direction, coincides with the outer periphery. An electrodynamic speaker featuring: