JPS63117599A - Dynamic speaker - Google Patents

Abstract

PURPOSE:To make the sound pressure frequency characteristic flat by providing a voice coil insertion use circular hole to the center and using a triangle pyramid shape cone diaphragm where the rigidity of cone faces consisting of flat parts is enhanced more than that of cone faces of each corner comprising curved faces. CONSTITUTION:The voice coil insertion use circular hole 14 is provided to the center, the outer circumference part is formed by a triangle, and the rigidity of the cone face comprising the flat parts 10a is enhanced more than that of the cone face of each corner 10b constituting a curved face for the cone face of the cone diaphragm 10 of the triangle pyramid of each corner as a curved face as the triangle pyramid diaphragm 10. Through the structure above, the front chamber effect is reduced, and the bending strength of a cone paper flat part 10a being comparatively weak is improved nearly equal to the strength of each corner lob constituted by curved faces and the characteristic of the sound pressure frequency is made flat with high efficiency. Since the frame shape is triangle, the space factor is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electrodynamic speaker with improved acoustic characteristics and space factor.

2. Description of the Related Art In recent years, electrodynamic speakers have been put into practical use in which the diaphragm is flat-shaped and the sound pressure frequency is custom-made flat, with the aim of improving acoustic characteristics.

A conventional electrodynamic speaker will be described below with reference to the drawings.

Conventionally, electrodynamic speakers generally have a configuration as shown in FIG. In FIG. 6, 1 is a cone-shaped diaphragm having a circular hole in the center for inserting a voice coil, 2
3 is a frame, 3 is an edge which is joined to the outer periphery of the diaphragm, and the outer periphery is further joined to the frame 2, 4 is a voice coil, 5 is a dust cap, 6 is a damper, and 7 is a magnetic circuit. The operation of the electrodynamic speaker configured as described above will be described below.

By passing a current through the voice coil 4 inserted into the magnetic gear a of the magnetic circuit element, the voice coil 4 vibrates up and down, which in turn causes the cone-shaped diaphragm 1 connected to the upper end of the voice coil 4 to vibrate. The dust cap 5 bonded to the upper surface of the cone-shaped diaphragm 1 is vibrated up and down, thereby vibrating the air and generating sound. However, this type of electrodynamic speaker
As shown in the figure, the cone surface that vibrates the air has a conical shape and is axially symmetrical with respect to the center line. , the phase will be reversed and a peak dip will occur in the custom sound pressure frequency as shown in Figure 7 (6).
Hereinafter, this phenomenon will be referred to as the anterior chamber effect. ).

Therefore, in recent years, an electrodynamic speaker having a configuration as shown in FIG. 8 has been developed and is widely used. In FIG. 8, 8 is a flat diaphragm, and 9 is a coupling cone that is joined to the upper end of the voice coil 4 and at the same time to the lower surface of the flat diaphragm 8. In the electrodynamic speaker configured as described above, when the voice coil 4 vibrates vertically, the flat diaphragm 8 vibrates vertically via the coupling cone 9 bonded to the upper end of the voice coil. This causes the air to vibrate and generate sound.Since the surfaces of the diaphragms that vibrate the air are flat, they are on the same plane, which reduces the front chamber effect and reduces the occurrence of phase differences. As shown in f, a flat sound pressure frequency characteristic with little peak dissociation was obtained.

Problems to be Solved by the Invention However, in such a conventional configuration, the diaphragm is a flat diaphragm! When 3 gold is used, there are problems in that the cost is significantly greater than when it is used in the cone-shaped diaphragm 1, and the efficiency is lowered because the diaphragm is heavier than the cone-shaped diaphragm.

The present invention solves these problems by using a cone-shaped diaphragm in the shape of a triangular pyramid for the diaphragm, thereby producing an electrodynamic speaker that is low cost, highly efficient, and has a flat sound pressure frequency characteristic. It is intended to provide, and furthermore,
The object of the present invention is to provide an electrodynamic speaker that improves the space factor by making the frame shape completely triangular.

Means for Solving All Problems In order to solve this problem, the present invention has a circular hole in the center for inserting the voice coil, the outer periphery is formed in a triangular shape, and each corner is curved. The diaphragm is constructed using a triangular pyramid-shaped cone diaphragm in which the stiffness of the cone surface formed by the flat portion is higher than that of the cone surface at each corner formed by the curved surface.

Function: With this configuration, a triangular pyramid-shaped cone diaphragm can be created at the same cost as a conventional cone-shaped cone diaphragm, and by making it a triangular pyramid-shaped cone diaphragm, it is possible to create a diaphragm that vibrates air. Since each surface is asymmetrical with respect to the fixed position of the voice coil, a phase difference occurs due to the vibration of each surface, but since the phases are different, the front chamber effect can be reduced. By partially changing the material thickness and cone paper density of the cone surface, it is possible to increase the stiffness and stiffness of the cone surface, which is made up of flat parts, compared to the cone surface of each corner, which is made up of curved surfaces. In terms of pressure frequency characteristics, it is possible to prevent the occurrence of large peak dips, and the sound pressure frequency characteristics can be flattened with high efficiency. Furthermore, by making the diaphragm shaped like a triangular pyramid, it is possible to create an electrodynamic speaker with an improved space factor, and it is also possible to install the speaker in a corner.

Implementation] An embodiment of the present invention will be described below with reference to all the drawings. Note that the same reference numerals as those in FIGS. 5 to 8 indicate the same parts.

FIG. 1 is a plan view showing the configuration of an electrodynamic speaker according to an embodiment of the present invention. In FIG. It has a circular hole, and each corner has 10bi
It is a triangular pyramid-shaped cone-shaped diaphragm that has a curved surface and has completely increased rigidity by partially changing the thickness and density of the cone paper for the flat part 10a, and 11 is the outer periphery of the cone-shaped diaphragm 10. 12 is a triangular frame that supports the outer periphery of the edge portion 11, and 13 is a mounting screw hole provided at each corner of the frame 12. 14 is a dust cap joined to the upper end of the voice coil. FIG. 2 shows the complete structure of the groove of the electrodynamic speaker according to the embodiment of the present invention shown in FIG. 1, and is a structural sectional view taken along the center line g of the plan view shown in FIG. , h is the center line of the structural cross-section.

The operation of the electrodynamic speaker configured as above will be described below.

As shown in Figure 2, a triangular pyramid-shaped cone-shaped diaphragm 1Q
The cone surfaces &, b have different inclinations with respect to the center line, and this makes the diaphragm surface that vibrates the air asymmetrical, so the sound radiated from the cone surfaces a, b of the cone-shaped diaphragm 1o. Although a phase difference occurs, the front chamber effect can be reduced because the phase is different on each plane.
In addition, a rib 1 in which the thickness of the cone paper and the density of the cone paper are partially changed is provided on the cone paper surface constituted by the flat portion 102L.
By radially providing the grooves, the rigidity of the surface can be increased, and when looking at the sound pressure frequency characteristics, as shown in Figure 3, the sound pressure frequency can be reduced with high efficiency while suppressing the occurrence of peak dips. Flat characteristics can be obtained.

Further, as shown in FIG. 4, an electrodynamic speaker 15 of the present invention
When using this, installation at each corner 16 made up of walls etc. in the room can be efficiently performed in a small space.

As described above, according to this embodiment, the central part has a circular hole for inserting the voice coil, the outer peripheral part is formed in a triangular shape, and the cone-shaped vibration has a triangular pyramid shape with each corner being a curved surface. By providing the cone-shaped diaphragm 10 in the shape of a triangular pyramid, the cone surface of the plate 10 has a higher rigidity than the cone surface of each corner 10b that constitutes a curved surface. The front chamber effect can be reduced, and the bending strength of the relatively weak cone paper plane portion 10a can be improved to the same level as the strength of each corner 10b made of a curved surface, resulting in high efficiency and flat sound pressure frequency characteristics. is obtained, and a triangular frame 12? By providing the electrodynamic speaker 15, it is possible to install the speaker 15 in a corner, and it is possible to obtain an electrodynamic speaker that improves the space factor.

Effects of the Invention As described above, according to the present invention, the central part has a circular hole for inserting the voice coil, the outer peripheral part is formed in a triangular shape, and each corner is a curved surface. By using an electrodynamic speaker with a triangular pyramid-shaped cone-shaped diaphragm plate that has a metal membrane, the cone surface made up of flat parts has increased rigidity compared to the cone surfaces at each corner.The front chamber effect can be reduced, and the cone surface The bending strength of each part can be increased, and a flat sound pressure frequency characteristic can be achieved with a cone-shaped diaphragm, which also provides benefits such as low cost and high efficiency.
Further, since the frame shape is triangular, it is possible to obtain an electrodynamic speaker with an improved space factor.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the structure of an electrodynamic speaker according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the structure of the electrodynamic speaker shown in FIG. 1, and FIG. 3 is an embodiment of the present invention. FIG. 4 shows a practical example of an electrodynamic speaker according to an embodiment of the present invention. FIG. 5 shows a layout cliff diagram of an electrodynamic speaker, and FIG. 6 is an enlarged sectional view of the cone-shaped diaphragm portion of the electrodynamic speaker shown in FIG. FIG. 8 is a structural sectional view of a conventional electrodynamic speaker (flat plate type). 4...Voice coil, 6...Dunbar, End...Magnetic circuit, 1o...Triangular pyramidal cone-shaped diaphragm, 1oa...・Plane part, 10b
... Corner, 11 ... Triangle edge, 12 ... Triangle frame, 13 ...
For installation, use screw holes, 14... dust cap,
17...Rib. Name of agent: Patent attorney Toshi Nakao (Male)
--Nepika's 2nd Kiyaku Figure 5, 3 Figure 6

Claims (2)

[Claims] (1) Has a circular hole in the center for inserting the voice coil,
A triangular pyramid-shaped cone diaphragm whose outer periphery is formed in a triangular shape, each corner is a curved surface, and the cone surface made up of the flat portion has higher rigidity than the cone surface of each corner made of the curved surface. An electrodynamic speaker composed of. (2) The electrodynamic speaker according to claim 1, which is constituted by a triangular pyramid-shaped cone-shaped diaphragm in which the material thickness and density of the cone surface are increased and the rigidity of the cone surface is partially improved.