JPS63117600A - Dynamic speaker - Google Patents

Abstract

PURPOSE:To obtain a speaker whose sound pressure frequency characteristic is flat with low cost and high efficiency by using a triangular pyramid shaped cone diaphragm for the diaphragm of the titled speaker and adopting a triangle shape for the frame so as to improve the space factor. CONSTITUTION:The slope of cone faces a, b of the triangle pyramid shaped cone diaphragm differs from each other with respect to a center line (h), and the diaphragm face vibrating air is asymmetric, then the sound radiated from the faces a, b has a phase difference but the phase differs from each face, then the front chamber effect is reduced. Moreover, a triangle dust cap 14 is arranged on the upper face of the diaphragm 10 and the dust cap structure where the adhered face with a flat part 10a is placed in the direction of frame in comparison with the corner 10b of the diaphragm 10 is adopted to enhance the rigidity of the cone face and the speaker whose sound pressure frequency characteristic is flat is obtained with high efficiency while suppressing the production of a peak dip.

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.

Conventional technology In recent years, with the aim of improving acoustic characteristics, electrodynamic speakers have been put into practical use with a flat diaphragm shape that flattens sound pressure frequency characteristics. .

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

Conventionally, electrodynamic speakers have generally had 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 7, 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 6 bonded to the top 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 is reversed, and a peak dip occurs in the sound pressure frequency characteristic as shown in FIG. 7e.

(Hereinafter, this phenomenon will be referred to as the front 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 connected to the upper end of the voice coil 4. This causes the air to vibrate and generate sound.Since the surfaces of the diaphragm 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 FIG. 7r, a flat sound pressure frequency characteristic with few peak dips was obtained.

Problems to be Solved by the Invention However, in such a conventional configuration, when the flat plate diaphragm 8 is used as the diaphragm, the cost is significantly increased compared to the case where the cone-shaped diaphragm 1 is used. Since it is heavier than the cone shape, there is a problem in that efficiency is reduced.

The present invention solves these problems, and provides an electrodynamic speaker with low cost, high efficiency, and flat sound pressure frequency characteristics by using a cone-shaped diaphragm in the shape of a triangular pyramid for the diaphragm. The purpose is to
The object of the present invention is to provide an electrodynamic speaker that improves the space factor by having a triangular frame shape.

Means for Solving the Problem In order to solve this problem, the present invention provides a cone-shaped diaphragm having a triangular outer circumference and a circular hole for inserting a voice coil in the center, and a cone-shaped diaphragm. It consists of a triangular edge part placed on the outer periphery of the cone-shaped diaphragm, a triangular frame that supports the outer periphery of the edge part, and a triangular dust cap placed on the top surface of the cone-shaped diaphragm. be.

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 voice coil drive position, 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 placing it on the top surface of the shaped diaphragm, the rigidity of the cone surface can be increased, and in terms of sound pressure frequency characteristics, it is possible to prevent the occurrence of large peak dips, and it is possible to flatten the sound pressure frequency characteristics with high efficiency. This means that it can be used as a carrier. Further, by making the frame shape triangular, 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.

EXAMPLE An example of the present invention will be described below with reference to the drawings. Note that the same reference numerals as those in FIGS. 6 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. 1, reference numeral 10 has a triangular outer circumference and a circular shape in the center for inserting a voice coil. It is a cone-shaped diaphragm in the shape of a triangular pyramid having a hole and each corner is curved, 11 is a triangular-shaped edge portion disposed on the outer periphery of the cone-shaped diaphragm 10, and 12 is an edge portion. 11 is a triangular shaped frame supporting the outer periphery of the frame 12, 13 is a mounting screw hole provided in a part of each corner of the frame 12, and 14 is a triangular shaped dust plate arranged on the upper surface of the cone diaphragm 1Q. It's a cap.

FIG. 2 shows the structure of the electrodynamic speaker according to the embodiment of the present invention shown in FIG. 1, and is a structural cross-sectional view taken from the center Mg 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 FIG. 2, a triangular pyramid-shaped cone-shaped diaphragm 1o
The cone surfaces a and b have different inclinations with respect to the center line, and this makes the diaphragm surface that captures the air asymmetrical, so that radiation is emitted from the cone surfaces a and b of the cone-shaped diaphragm 1Q. There is a phase difference in sound, but since the phase is different on each plane, the front chamber effect can be reduced.
Further, a triangular-shaped dust cap 14 is arranged on the upper surface of the cone diaphragm 10, and the shape of the dust cap 14 is adjusted so that the adhesive surface between the cone surface and the dust cap 14 is a corner of the cone diaphragm 10, where the adhesive surface between the cone surface and the dust cap 14 is a curved surface. The flat part 10 of the cone diaphragm 10 is made of a flat surface compared to the part 10b.
By adopting a dust cap structure in which the adhesive surface with It is possible to obtain high efficiency and flat sound pressure frequency characteristics by suppressing the occurrence of noise.

Further, as shown in FIG. 4, an electrodynamic speaker 1 of the present invention
6, it can be efficiently installed in each corner 16 formed by a wall or the like in a room in a small space.

As described above, according to this embodiment, the cone-shaped diaphragm 1o has a triangular pyramidal shape, the outer circumferential part of which is formed in a triangular shape, and the center part of which has a circular hole for inserting a voice coil, and a triangular-shaped cone-shaped diaphragm 1o. By providing the cap 14, the front chamber effect can be reduced, the rigidity of the cone surface can be increased, and high efficiency and flat sound pressure frequency characteristics can be obtained. By making the electrodynamic speaker 15 equipped with the frame 12,
The speaker can be installed in a corner, making it an electrodynamic speaker with an improved space factor.

Effects of the Invention As described above, the present invention provides a cone-shaped diaphragm having a triangular outer circumference and a circular hole for inserting a voice coil in the center, and an outer circumference of the cone-shaped diaphragm. The front chamber effect can be reduced by providing a triangular edge disposed on the edge, a triangular frame supporting the outer periphery of the edge portion, and a triangular dust cap disposed on the top surface of the cone-shaped diaphragm. The cone-shaped diaphragm can increase the rigidity of the surface and achieve a flat sound pressure frequency response, which also results in low cost and high efficiency. Since the shape is triangular,
This provides the advantage of being able to provide 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. A sound pressure frequency characteristic diagram of an electrodynamic speaker according to an example, FIG. 4 is a layout diagram of an electrodynamic speaker showing a practical example of an electrodynamic speaker according to an embodiment of the present invention, and FIG. 6 is a diagram of a conventional electrodynamic speaker. Figure 6 is an enlarged cross-sectional view of the cone-shaped diaphragm portion of the electrodynamic speaker shown in Figure 6. Figure 7 is a structural cross-sectional view of a conventional electrodynamic speaker (cone type). FIG. 8 is a structural sectional view of a conventional electrodynamic speaker (flat plate type). 4... Poisco/fle, 6... Damper, 7... Magnetic circuit, 10... Cone-shaped diaphragm, 11... Triangle Edge of shape, 12.
...triangular frame, 13...screw holes for mounting, 14...triangular dust cap. Name of agent: Patent attorney Toshio Nakao Haga 1 person No. 3
Figure 4 Figure 5 a-7 Figure 6 Figure 7 Number of liquids per station Figure 8

Claims (2)

[Claims] (1) A cone-shaped diaphragm having a triangular outer periphery and a circular hole in the center for inserting a voice coil, and a triangular edge portion arranged on the outer periphery of the cone-shaped diaphragm. , an electrodynamic speaker comprising a triangular frame supporting the outer periphery of the edge portion, and a triangular dust cap disposed on the upper surface of the cone-shaped diaphragm. (2) At the adhesive surface between the cone surface and the dust catkip,
The patent claim consists of a triangular-shaped dust cap structured such that the adhesive surface with the cone diaphragm, which is made up of a flat part, is located toward the frame compared to the corner part of the cone diaphragm, which is made up of a curved surface. The electrodynamic speaker according to scope 1.