JPS6214799Y2 - - Google Patents

Description

[Detailed description of the invention] The invention consists of a frame having an opening, a diaphragm attached to one end of the frame via an edge, a magnetic circuit consisting of a plate, a yoke, and a magnet, and a magnetic circuit formed in the magnetic circuit. The present invention relates to a speaker formed by a gap formed by a diaphragm and a voice coil connected to the diaphragm and disposed within the gap.

FIG. 1 shows a conventional external magnetic cone type speaker, which is an example of a speaker having the above structure, in which a diaphragm 1 is attached to one end of a frame 3 having an opening 3a through an edge 2, and a plate In a magnetic circuit 7 consisting of a magnet 4, a magnet 5, and a yoke 6, the other end of the frame 3 is attached to the plate 4, and the voice coil 9 of the voice coil bobbin 8 attached to the diaphragm 1 is connected to the plate 4 of the magnetic circuit 7. It has a structure in which it is inserted into a gap 11 provided between the center pole 10 of the yoke 6 and the center pole 10 of the yoke 6. In the figure, 12 is a damper, and 13 is a cap.

By the way, in this type of conventional speaker, the magnetic circuit 7
Because the outer surface of the diaphragm 1 has a highly uneven shape, the sound waves radiated to the rear surface of the diaphragm 1 pass through the opening 3a of the frame 3, and are significantly diffusely reflected at the uneven portions 14 due to a diffraction phenomenon, causing interference with each other. If the wavelength is long, turbulence may occur, resulting in distorted sound. Since the diaphragm 1 generally does not have much of a sound insulation effect, this distorted sound is also radiated to the front of the diaphragm 1, appearing as distortion of the reproduced sound or disturbance of the frequency characteristics, which significantly impairs the sound quality. It is deteriorating.

The present invention was devised to correct the above-mentioned defects, and is an equalizer whose surface is a continuous curved surface such as a streamlined shape, a spherical surface, or a combination of a curved line and a straight line. and covers the outer surface of the yoke to eliminate unevenness on the outer surface of the magnetic circuit, thereby reducing interference and turbulence caused by diffuse reflection of sound waves emitted from the rear surface of the diaphragm through the opening of the frame. It is.

The equalizer used in this invention refers to something that smoothly disperses the sound waves radiated to the rear surface of the diaphragm.

An embodiment in which the present invention is applied to an external magnetic cone speaker will be described below with reference to FIG. The structure of the speaker itself is the same as that of the conventional example shown in FIG. 1, so the same reference numerals are given and the explanation thereof will be omitted.

That is, 16 is an equalizer, and this equalizer 16 directly covers the outer surface of the magnetic circuit 7 consisting of the plate 4 including at least the other end of the frame 3, the magnet 5, and the yoke 6. The surface of the equalizer 16 is formed into a continuous curved surface 17 such as a streamlined shape as shown in the drawings, a spherical surface, or a combination of a curved line and a straight line. The material for the equalizer 16 is preferably so-called hard felt, which is made by hardening felt with synthetic resin, but it is also possible to use foamed resin, molded products of various materials, etc., and in the present invention, such materials can be used. It is not limited to. Further, the equalizer 16 does not necessarily have to be an integral structure as shown in the drawings, but may be a structure that can be appropriately divided and assembled.

However, according to the speaker configured in this way, the unevenness 14 on the outer surface of the magnetic circuit 7 is removed by the equalizer 16, and the surface of the equalizer 16 is formed into a continuous curved surface 17, so that the diaphragm 1 Sound waves radiated from the rear surface through the opening 3a of the frame 3 are smoothly diverged along the continuous curved surface 17. Therefore, interference caused by the sound waves being diffusely reflected on the outer surface of the magnetic circuit 7 and generation of turbulence are reduced, and distorted sound is reduced, so that distortion of reproduced sound or disturbance of frequency characteristics is reduced. , the playback quality improves.

Note that Fig. 3 is a frequency characteristic diagram obtained by experimentally measuring the frequency characteristics of the conventional speaker shown in Fig. 1, and Fig. 4 is a frequency characteristic diagram obtained by experimentally measuring the frequency characteristics of the speaker of the present invention shown in Fig. 2. It is a frequency characteristic diagram. According to this, conventional speakers are around 500Hz, around 1400Hz, around 2200Hz, and around
It can be seen that while there is a large disturbance in the frequency characteristics near 5100 Hz, the above disturbance is reduced in the speaker of the present invention.

As mentioned above, the present invention covers the other end of the frame, the plate, the magnet, and the outer surface of the yoke with an equalizer whose surface is a continuous curved surface, thereby removing the irregularities on the outer surface of the magnetic circuit. The sound waves emitted from the rear surface through the opening of the frame are smoothly dispersed along a continuous curved surface.
It is possible to reduce interference and turbulence caused by diffused reflection of sound waves on the outer surface of the magnetic circuit. This has the advantage that distortion of reproduced sound or disturbance in frequency characteristics can be reduced, and the quality of reproduced sound can be improved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional external magnet type cone speaker, Fig. 2 is a sectional view showing an embodiment of an external magnet type cone speaker to which the present invention is applied, and Fig. 3 is a sectional view of the conventional external magnet type cone speaker. FIG. 4 is a frequency characteristic diagram of the speaker according to the present invention. Also, in the symbols used in the drawings, 1... diaphragm, 2... edge, 3... frame, 3a...
Frame opening, 4... plate, 5... magnet, 6... yoke, 7... magnetic circuit, 9... voice coil, 11... air gap, 16... equalizer, 17... continuous curved surface of equalizer, be.

Claims (1)

[Scope of utility model registration request] A frame having an opening, a diaphragm attached to one end of the frame via an edge, and a magnetic circuit comprising a plate, a yoke, and a magnet;
In a speaker formed by a gap formed in the magnetic circuit and a voice coil connected to the diaphragm and disposed in the gap, the other end of the frame is fixed to the upper surface of the plate, and the frame A speaker characterized in that the other end, the outer surface of the plate, magnet, and yoke are covered with an equalizer whose surface is a continuous curved surface.