JPS63116599A - Dynamic speaker - Google Patents

Abstract

PURPOSE:To flatten a sound pressure frequency characteristic by providing a frame for supporting the periphery of the edge of a triangular form disposed at the peripheral part of a cone form diaphragm having a circular hole for inserting a voice coil at a central part. CONSTITUTION:An outer peripheral part is formed by the triangular form, the circular hole for inserting the voice coil is provided in the central part, further, the cone shape diaphragms 10a, 10b of the triangular cone form having the respective corners of curved surfaces, the edge part 11 of the triangular form disposed at the outer peripheral part of the cone shape diaphragms 10a, 10b and the frame 12 of the triangular form for supporting the periphery of the edge part are provided. The cone shape diaphragms 10a, 10b have different inclinations with respect to a center line (h), thereby, diaphragm surfaces for oscillating air are asymmetrical, so that a sound radiated from the cone shape diaphragms 10a, 10b produced a phase difference, however, since the phases are different in respective surfaces, a front room effect can be reduced. Thereby, the flat sound pressure frequency characteristic can be obtained with high efficiency.

Description

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

Conventional technology 2・＼−.

In recent years, electrodynamic speakers have been put into practical use in which the diaphragm is flat and the sound pressure frequency characteristics are leveled, 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 that 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 gap, 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 a cone-shaped vibration connected to the two ends of the voice coil 4. To the dust 3 joined to the upper surface of the plate 1 and the cone-shaped diaphragm 1.

It vibrates the gap 5 up and down, thereby vibrating the air and generating sound. but,
In this type of electrodynamic speaker, the cone surface that vibrates the air is conical, as shown in Figure 7, and is axially symmetrical with respect to the center line. The sound radiated from d has an opposite phase at a certain frequency, resulting in a peak dip in the sound pressure frequency characteristic as shown in FIG. 8e. (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. 9 has been developed and is widely used. In FIG. 9, 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 in this manner, 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 surface of the diaphragm that vibrates the air is flat, it is flush with the same surface, which reduces the front chamber effect and reduces the phase difference. As shown in Figure 8 f, a flat sound pressure frequency characteristic with few peak dips can be obtained.

Problems to be Solved by the Invention However, in such a conventional configuration, when a flat plate diaphragm is used as the diaphragm, the cost increases significantly compared to the case where a cone-shaped diaphragm is used, and the weight of the diaphragm increases. There was a problem that efficiency decreased because it was heavier than the cone shape.

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. Another object of the present invention is to provide an electrodynamic speaker with an improved space factor by having a triangular frame shape.

Means for Solving the Problem 5-7 In order to solve this problem, the present invention has a triangular outer circumference, a circular hole in the center for inserting the voice coil, and , consisting of a cone-shaped diaphragm in the shape of a triangular pyramid with curved corners at each corner, a triangular-shaped edge part placed on the outer periphery of the cone-shaped diaphragm, and a triangular-shaped frame that supports the outer periphery of the edge part. It is.

Function: With this configuration, it is possible to create a triangular pyramid-shaped cone diaphragm at the same cost as a conventional cone-shaped cone diaphragm, and by making the triangular pyramid-shaped cone diaphragm, it is possible to produce vibrations that vibrate the air. Since the surfaces of the plate are 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, and when viewed from the sound pressure frequency characteristic, there is a large It is possible to prevent the occurrence of peak depths, thereby making it possible to level out the sound pressure frequency characteristics with high efficiency.

6. The frame shape was changed to a triangular shape.
7. Therefore, it is possible to arrange the speakers adjacent to each other or to install them in a corner, and it is possible to obtain an electrodynamic speaker that improves the space factor.

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 9 indicate the same parts.

FIG. 1 is a plan view showing the structure of an electrodynamic speaker according to an embodiment of the present invention. In FIG. It is a cone-shaped diaphragm having a circular hole and a triangular pyramid shape with each corner being curved. 11 is a triangular edge portion disposed on the outer periphery of the cone-shaped diaphragm 10, and 12 is an edge portion. It is a triangular frame that supports the entire outer circumference of the part 11, 13 is a screw hole provided at each corner of the frame 12, and 14 is a dust cap joined to the upper end of the voice coil. .

FIG. 2 does not show 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 at the center mg of the plan view shown in FIG. 1. , 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 10
a and 1ob have different inclinations with respect to the center line, which makes the surface of the diaphragm that vibrates the air asymmetrical, so the cone-shaped diaphragm 10a.

There is a phase difference in the sound emitted from 10b, but since the phase is different on each plane, the front chamber effect can be reduced, and when looking at the sound pressure frequency characteristics, the sound pressure is high as shown in Figure 3i. It is possible to obtain a flat sound pressure frequency characteristic with efficiency.

Further, as shown in FIG. 1, by making the frame 12 triangular, it is possible to arrange the electrodynamic speakers 15 of the present invention adjacently as shown in FIG.
As shown in the figure, when the electrodynamic speaker 15 of the present invention is used, 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 outer periphery is formed in a triangular shape, and the central part has a circular hole for inserting the voice coil, and each corner has a triangular pyramid shape with a fully curved surface. By providing the cone-shaped diaphragm 10,
The front chamber effect can be reduced, high efficiency and even sound pressure frequency characteristics can be obtained.By using an electrodynamic speaker with a triangular frame 12, the adjacent arrangement of the speakers can be achieved. It is also possible to install the speaker in a corner, making it an electrodynamic speaker with an improved space factor.

Effects of the Invention According to the present invention, the outer periphery is formed in a triangular shape, the central part has a circular hole for inserting the voice coil, and each corner is curved. The front chamber effect can be reduced by providing a cone-shaped diaphragm, a triangular edge placed on the outer periphery of the cone-shaped diaphragm, and a triangular frame that supports the outer periphery of the edge. A cone-shaped diaphragm can achieve flat sound pressure frequency characteristics, and this also provides low cost and high efficiency effects.Also, since the frame is triangular in shape, 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, FIGS. 4 and 5 are 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. A structural sectional view of a conventional electrodynamic speaker (cone type), Fig. 7, is shown in Fig. 6. An enlarged sectional view of a cone-shaped diaphragm portion of an electrodynamic speaker, Fig. 8
The figure is a sound pressure frequency characteristic diagram of a conventional electrodynamic speaker (cone type, flat plate type), and FIG. 9 is a structural sectional view of a conventional electrodynamic speaker (flat plate type). 4...Voice coil, 6...Danno<-
, 7...magnetic circuit, 10, 10a, 10b...
...Triangular pyramidal cone-shaped diaphragm, 11...
Triangular edge, 12... Triangular frame, 13
...Mounting screw hole, 14...Dust cap, 15...Electrodynamic speaker of the present invention,
16... Co-poo consisting of indoor walls, etc.

Claims (2)

[Claims] (1) The outer periphery is formed in a triangular shape,
Consisting of a cone-shaped diaphragm with a circular hole in the center for inserting a voice coil, a triangular-shaped edge part placed on the outer periphery of the cone-shaped diaphragm, and a triangular-shaped frame that supports the outer periphery of the edge part. electrodynamic speaker. (2) The outer periphery is formed in a triangular shape,
The electrodynamic speaker according to claim 1, comprising a cone-shaped diaphragm in the shape of a triangular pyramid with curved corners.