JP2009171492A - Speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker that achieves thinning, increases the sound pressure of a high output, and reduces distortions of sound of a speaker. <P>SOLUTION: A first magnet and a second magnet are arranged in a slanting direction or in a nearly horizontal direction, a magnetic gap is provided in a clearance between the first and second magnets, and a voice coil is arranged freely movable in the magnetic gap. A vibrating plate is connected with the voice coil, and the first magnet is provided on the upper surface of the central part of a yoke and the second magnet is provided on the lower surface of the upper part of the yoke at the outside position of the first magnet. A damper is provided between a supporter at the central part of the vibrating plate and a first plate on the upper surface of the first magnet. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a speaker used for various audio equipment.

  A conventional speaker will be described with reference to FIG.

  Referring to FIG. 5, a conventional speaker has a magnetized magnet 1 installed on a lower plate 3 having a center pole 3A, and an upper magnet type magnetic circuit 4 is formed by connecting the plate 2 to the upper portion of the magnet 1. ing. A frame 6 is installed in the magnetic circuit 4, and a diaphragm 7 is coupled to the periphery of the frame 6, and a voice coil body 8 is coupled to the diaphragm 7 and inserted into the magnetic gap 5 of the magnetic circuit 4. It is composed.

  The above-described speaker has a so-called stacking method in which the frame 6 is installed in the magnetic circuit 4 as a configuration of the entire height. Therefore, the total height of the speaker requires a total size of the magnetic circuit 4 and the frame 6 at a minimum.

  Recently, the spread of flat-screen TVs such as liquid crystal and plasma has been remarkable in the AV product field, and the mobile product field has been developed to be multi-functional and thin, and the in-vehicle field has been responding to the global environment. The purpose of energy conservation is thriving. Against the background described above, there is a strong demand for downsizing, thinning, and high output of the above-described conventional speaker.

  Under such circumstances, in order to reduce the thickness while maintaining the conventional speaker structure, it is natural to downsize the magnet forming the magnetic circuit. However, the magnetic force is reduced by making the magnet smaller. There is a problem that the sound output becomes weaker and the sound output becomes smaller, and there is a limit to the reduction of the magnet.

As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.
JP 2005-51283 A

  In order to reduce the thickness of a conventional speaker while maintaining its structure, there has been a problem that the limit has already been reached with respect to strict market demand.

  In addition, when outputting high output sound in AV equipment or the like, the voice coil body 8 which is a drive system component swings up and down like a pendulum at a large amplitude, so that sound distortion and gaps due to rolling occur. There is also a problem that abnormal sounds are generated due to defects.

  SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a loudspeaker that can solve such problems, can be thinned, can increase sound output, and can reduce distortion of sound from the loudspeaker.

  In order to achieve this object, in the present invention, the first magnet and the second magnet are arranged in an oblique direction or a substantially horizontal direction, and a gap is provided between the first magnet and the second magnet. A voice coil body movably disposed in the magnetic gap, and a diaphragm coupled to the voice coil body, wherein the first magnet is provided on an upper surface of a central portion of the yoke, The second magnet is provided on the lower surface side of the upper portion of the yoke at a position outside the first magnet, and includes a support provided at the center of the diaphragm and a first plate provided on the upper surface of the first magnet. A damper is provided between them.

  In the present invention, by using two magnets, a first magnet and a second magnet, arranged obliquely or substantially horizontally through a magnetic gap, the magnetic force is strengthened and high-output sound can be output. At the same time, since the thickness of the first magnet can be reduced when the same output is output, the speaker can be made thinner.

  Also, the damper provided between the support provided at the center of the diaphragm and the first plate provided on the upper surface of the first magnet prevents the voice coil body from rolling even at large amplitudes, Sound distortion and gap defects can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 shows a structural cross section of a speaker of the present invention.

  In FIG. 1, a first magnet 11 is installed on the upper surface of the central portion of a yoke 18, and a first plate 12 is provided thereon. The second magnet 13 is provided by being bonded to the lower surface side of the yoke upper surface 19 at a position outside the first magnet 11, and the first magnet 11 and the second magnet 13 are inclined or substantially horizontal. It has become. A second plate 14 is bonded to the lower surface of the second magnet 13.

  The first magnet 11, the first plate 12, the second magnet 13, the second plate 14, and the yoke 18 constitute a magnetic circuit.

  The outer peripheral portion of the diaphragm 15 is connected to the frame 21, a support 24 is provided at the center of the diaphragm 15, and a damper 25 is provided between the support 24 and the first plate 12. By adopting such a structure, it is possible to prevent the voice coil body 16 from rolling even when the amplitude is large, and to reduce speaker distortion and gap defects.

  The voice coil body 16 has a structure in which the coil 23 is wound around the outer periphery of the bobbin 22, the upper part of the bobbin 22 is bonded to the diaphragm 15, and the voice coil body 16 is movable in the vertical direction with respect to the magnetic gap 17. By freely moving, it has a structure that becomes a shaft for vibrating the diaphragm 15.

  FIG. 2 is a diagram showing magnetic field analysis of the voice coil portion in the magnetic gap of the speaker of the present invention.

  In FIG. 2, the magnetic flux emitted from the upper surface N pole of the first magnet 11 travels in a substantially horizontal direction toward the magnetic gap 17 and enters the lower surface S pole of the second magnet 13. In the portion of the coil 23 in the magnetic gap 17, a magnetic flux that is substantially orthogonal to the vibration direction of the diaphragm effective for driving is obtained as indicated by a white arrow.

  Then, by applying an audio signal to the coil 23 of the voice coil body 16, the voice coil body 16 reacts with the magnetic field of the magnetic gap 17 to drive the voice coil body 16 in the vertical direction. Sound is transmitted.

  Since the speaker of the present invention uses the first magnet 11, the second magnet 13, and the two magnets to form the magnetic gap 17, a large driving force can be generated in the voice coil body 16. The sound output by the diaphragm 15 can also be increased.

  Further, when designing a speaker that outputs the same output, the volume of the first magnet 11 can be reduced as compared with the conventional configuration using only one magnet. Thus, the height of the magnet 11 can be kept low, the overall height of the speaker can be reduced, and the thickness can be reduced.

  FIG. 3 is a perspective view in which the structure of the speaker of the present invention is applied to a circular speaker, and the circular speaker is cut in half. The first magnet 11, the first plate 12, the second magnet 13, and the second plate 14 are an annular magnet and a plate. Similarly, the shapes of the voice coil body 16, the diaphragm 15, and the damper 25 are also circular.

(Embodiment 2)
FIG. 4 is a perspective view in which the structure of the speaker of the present invention is applied to an elongated speaker, and the elongated speaker is cut in half.

  In this configuration, the first magnet 11, the first plate 12, the second magnet 13, and the second plate 14 use rod-like magnets and plates having a plate-like elongated rectangular body, and the length of the elongated speaker. Arranged in the direction.

  The rod-shaped magnet is preferably composed of a neodymium magnet for both the first magnet 11 and the second magnet 13, but may be used in combination with a ferrite magnet.

  Further, in configuring this elongated speaker, it is necessary to limit the first magnet 11, the first plate 12, the second magnet 13, and the second plate 14 to a rod-like shape having a plate-like elongated rectangular body. Of course, a plate-like elliptical magnet and plate may be used.

  Also in the elongated speaker of the present invention, a speaker having the same effect as that of Embodiment 1 can be realized.

  The loudspeaker of the present invention can generate a large driving force by using two magnets, increase the sound pressure of high output, reduce the overall height of the loudspeaker, and can be thinned, and further, distortion of sound. And gap defects can be reduced, which is useful for thin speakers used in various audio equipment.

Cross-sectional view of the structure of the speaker of the present invention The figure which shows the magnetic field analysis of the voice coil part in the magnetic gap of the speaker of this invention The perspective view which cut off the half of the circular speaker of this invention The perspective view which cut off half of the elongate type speaker of this invention Cross-sectional view of a conventional speaker structure

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 1st magnet 12 1st plate 13 2nd magnet 14 2nd plate 15 Diaphragm 16 Voice coil body 17 Magnetic gap 18 Yoke 19 Yoke upper surface 21 Frame 22 Bobbin 23 Coil 24 Support body 25 Damper

Claims (5)

The first magnet and the second magnet are arranged in an oblique direction or a substantially horizontal direction,
Providing a gap between the first magnet and the second magnet to form a magnetic gap;
A voice coil movably disposed in the magnetic gap;
A diaphragm coupled to the voice coil;
The first magnet is provided on the upper surface of the central portion of the yoke,
The second magnet is provided on the lower surface side of the upper part of the yoke at a position outside the first magnet,
A speaker having a configuration in which a damper is provided between a support provided at a central portion of the diaphragm and a first plate provided on an upper surface of the first magnet. 2. The speaker according to claim 1, wherein the first and second magnets are magnetically coupled to form a magnetic circuit. The speaker according to claim 1, wherein the first and second magnets are annular magnets. 2. The speaker according to claim 1, wherein the first and second magnets are plate-like bar magnets or elliptic magnets. The speaker according to claim 1, wherein when the first and second magnets are plate-like rod-shaped magnets, each of the first and second magnets is two.

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