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Speaker and magnetic circuit used for the speaker

A magnetic circuit and speaker technology, applied in the direction of sensors, electrical components, etc., can solve the problems of complicated manufacturing process and so on

Inactive Publication Date: 2008-10-29
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when assembling the magnetic circuit, it is necessary to use a special jig, and there is a problem that the manufacturing process becomes complicated.

Method used

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  • Speaker and magnetic circuit used for the speaker
  • Speaker and magnetic circuit used for the speaker
  • Speaker and magnetic circuit used for the speaker

Examples

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Embodiment Construction

[0026] Below, combine Figure 1-Figure 5 One embodiment of the present invention will be described.

[0027] (Embodiment 1)

[0028] figure 1 It is a half sectional view of the speaker according to Embodiment 1 of the present invention, and Fig. 2(a) and Fig. 2(b) are half sectional views of the magnetic circuit of the main part of another development example of this embodiment.

[0029] The loudspeaker according to the embodiment of the present invention is composed of the following members: a central plate 1 provided with a convex portion 1a at the top; a first magnet 2 bonded to the lower surface of the central plate 1 and magnetized in the thickness direction; The magnet 2 is magnetized in the opposite direction, and the ring-shaped second magnet 3 bonded to the upper surface of the center plate 1; the top plate 4 bonded to the upper surface of the second magnet 3; bonded to the lower surface of the first magnet 2 The bottom plate 5; the yoke 6 combined with the periph...

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PUM

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Abstract

A loudspeaker includes a magnetic circuit comprising a center plate, first and second magnets disposed respectively on a lower surface and an upper surface of the center plate and magnetized to be repulsive to each other, an under plate disposed at a lower surface of the first magnet, and a yoke. The loudspeaker further comprises a voice coil, a diaphragm, an edge coupled with the outer circumferential edge of the diaphragm, and a frame. The above-described magnetic circuit further comprises a top plate disposed on an upper surface of the second magnet. Both of the second magnet and the top plate have a ring shape, the inner and the outer diameters of the second magnet and the top plate being substantially the same. Outer diameters of the second magnet and the top plate are smaller than that of the center plate, and the center plate is provided on its upper surface with a protrusion for positioning of the second magnet. A compact loudspeaker having a sufficient driving force can be provided in accordance with the present invention.

Description

[0001] This application is a divisional application with the filing date of August 24, 2001, the application number of 01802507.2, and the title of "Speaker and the Magnetic Circuit Used therein". technical field [0002] The present invention relates to an electrodynamic loudspeaker and the magnetic circuit used therein. Background technique [0003] In recent years, along with the reduction in space of audio equipment, there has been an increasing demand for smaller and lighter speakers mounted in the audio equipment. Since the miniaturization of the magnetic circuit is effective for downsizing and reducing the weight of the speaker, Nd-Fe-B magnets with high energy products are often used. Due to the high price of Nd-Fe-B magnets, high efficiency is required for the magnetic circuit in terms of cost. In addition, especially among vehicle-mounted speakers, a large number of broadband speakers that reproduce the entire audible frequency band are used. [0004] here, use ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R9/06H04R9/02
CPCH04R9/025H04R9/06
Inventor 铃木隆司小浦哲司
Owner PANASONIC CORP