JP2008092029A - Speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-output speaker substantially reducing distortion. <P>SOLUTION: First and second magnets 19 and 20 are arranged in an oblique direction or a roughly horizontal direction through a magnetic gap 24. Also, a diaphragm 15 is configured such that its one end is connected to the upper part of a voice coil body 14, and it is arranged in the upper part of the second magnet 20, and a damper 18 is configured such that its one end is connected to the lower part of the voice coil body 14, and it is arranged in the lower part of the second magnet 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a speaker.

  In general, in a speaker, a magnetic circuit 1 is composed of a yoke 9, a magnet 7 and a plate 10 as shown in FIG. 2, and a voice coil body 2 movably disposed in a magnetic gap 8 of the magnetic circuit 1 is arranged on a diaphragm 3. The outer peripheral end of the diaphragm 3 is connected to the frame 5 via the edge 4, and the voice coil body 2 and the frame 5 are connected by a damper 6. The conventional damper 6 has a corrugated structure made of a material such as urethane, foam rubber, SBR rubber, or cloth. The corrugated structure ensures a predetermined elastic modulus and drives the voice coil body 2. The rolling at the time was suppressed.

As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.
JP-A-11-150791 (FIG. 8)

  However, the conventional speaker has a problem in that the voice coil body 2 which is a drive system component rolls at a large amplitude and generates an abnormal sound. The cause of this rolling is that the diaphragm 3 and the damper 6 that support the relatively heavy voice coil body 2 are both fixed above the voice coil body 2 at a position away from the center of weight. Since it is supported in the state of a beam, when the voice coil body 2 swings up and down like a pendulum at a large amplitude, there is a problem that abnormal sound is generated due to distortion due to rolling or a gap defect. .

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve such a problem and to provide a loudspeaker capable of increasing a high-output sound pressure and reducing the distortion of the loudspeaker.

  In order to achieve this object, the present invention includes first and second magnets arranged obliquely or substantially horizontally through a magnetic gap, and a voice coil body movably arranged in the magnetic gap. A diaphragm and a damper coupled to the voice coil body, the diaphragm having one end connected to the upper portion of the voice coil body and disposed above the second magnet, and the damper having the one end connected to the voice coil It connects with the lower part of a body, and is set as the structure arrange | positioned under the 2nd magnet.

  In the present invention, by using two magnets which are a first magnet and a second magnet, a large driving force can be generated to increase a high-output sound pressure, and a diaphragm is disposed above the voice coil body. And a damper attached to the lower part of the voice coil body, so to speak of a doubly-supported beam structure, prevents the voice coil body from rolling even at large amplitudes and reduces speaker distortion and gap defects. Is.

  Hereinafter, an embodiment of the present invention will be described with reference to FIG.

  FIG. 1 is a cross-sectional view showing a speaker according to the present invention. A magnetic circuit 11 disposed at the center of the bottom of a mortar-shaped frame 17 includes a first magnet 19, a first plate 21, a second magnet 20, The second plate 22 and the yoke 23 are combined and bonded together.

  The first magnet 19 is disposed at the bottom of the central portion of the yoke 23, the second magnet 20 is disposed at the lower portion on the upper surface side of the yoke 23, and the first magnet 19 and the second magnet 20 are interposed via the magnetic gap 24. Are arranged at an oblique position. A magnetic circuit having such a configuration is called an oblique magnetic circuit.

  The magnetic gap 24 is formed by the first magnet 19, the first plate 21, the second magnet 20, and the second plate 22 so as to open toward the upper surface side in the magnetic circuit 11.

  The voice coil body 14 has a structure in which the coil 12 is wound around an outer peripheral portion of a cylindrical bobbin 13, and is disposed so as to be movable in the vertical direction with respect to the magnetic gap 24. It has a structure that serves as an axis for vibrating the diaphragm 15 connected to the outer periphery.

  A dust cap 25 as a dustproof measure is provided at the upper end of the voice coil body 14.

  The diaphragm 15 is a part that becomes a sound source of the speaker, and is mainly made of pulp and resin having both high rigidity and internal loss. The outer peripheral end part of the diaphragm 15 has an edge 16 protruding upward or downward. The inner end of the frame 17 is fixed above the voice coil body 14. The edge 16 is made of a material such as urethane, foam rubber, SBR rubber or cloth so as not to apply a movable load to the diaphragm 15.

  The damper 18 has a disc-like corrugated structure, and its inner peripheral end is connected to a position below the coil 12 of the voice coil body 14, and its outer peripheral end is connected to the yoke 23. This corrugated structure is a corrugated ring structure having elasticity, and is configured to expand and contract in response to the driving of the voice coil body 14, and easily follows the driving of the voice coil body 14.

  By applying an audio signal to the coil 12 of the voice coil body 14, the voice coil body 14 reacts with the magnetic field of the magnetic gap 24 to drive the voice coil body 14 in the vertical direction. It is what is done.

  In the speaker of the present invention, the magnetic gap 24 is configured by using the two magnets of the first magnet 19 and the second magnet 20, so that a large driving force can be generated in the voice coil body 14, As a result, the sound output by the diaphragm 15 can be increased.

  Further, in such a magnetic circuit configuration, a space for disposing the damper 18 can be provided below the second magnet 20, so that the damper 18 is disposed at this position, and the inner peripheral end of the damper 18 is connected to the voice. The coil body 14 can be connected below. Thereby, since the voice coil body 14 can be attached with the diaphragm 15 on the upper side and the damper 18 on the lower side, the so-called doubly-supported beam structure is formed, so that the voice coil body 14 can be prevented from rolling.

  INDUSTRIAL APPLICABILITY The present invention can increase a high-output sound pressure in a speaker and can reduce distortion and a gap defect, and is useful for an audio video speaker or an in-vehicle speaker.

Sectional drawing of the speaker in one embodiment of this invention Cross-sectional view of a conventional speaker

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Magnetic circuit 12 Coil 13 Bobbin 14 Voice coil body 15 Diaphragm 16 Edge 17 Frame 18 Damper 19 1st magnet 20 2nd magnet 21 1st plate 22 2nd plate 23 Yoke 24 Magnetic gap 25 Dust cap

Claims (2)

First and second magnets arranged obliquely or substantially horizontally through a magnetic gap, a voice coil body movably arranged in the magnetic gap, a diaphragm and a damper coupled to the voice coil body, The diaphragm having one end connected to the upper part of the voice coil body and disposed above the second magnet, and the damper having one end connected to the lower part of the voice coil body and below the second magnet. A speaker configured to be disposed in The speaker according to claim 1, wherein the first and second magnets are magnetically coupled to form a magnetic circuit.

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