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Speaker

A loudspeaker and magnetic circuit technology, applied in the field of small and thin loudspeakers, can solve the problems that affect the difficulty of improving the ability of mass production, and achieve the effect of improving the ability of mass production

Inactive Publication Date: 2009-12-09
HOSIDEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Conventional speakers are greatly affected by the adhesive used to assemble the magnetic circuit, making it difficult to improve mass production capabilities.

Method used

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Embodiment Construction

[0014] Embodiments of the present invention will be described below based on the drawings.

[0015] figure 1 , figure 2 The loudspeaker 1 shown includes a frame 2 integrally formed with a magnetic yoke, a magnetic circuit 3 and a vibration system 4 made of magnetic material.

[0016] The frame 2 is formed in a low-walled cylindrical shape with a bottom, and has a circular bottom plate 5 and an outer wall 6 erected from the outer periphery of the bottom plate 5 . A horizontal stepped surface 7 is provided on the outer wall 6 , and the diameter of the upper part of the outer wall 6 is larger than the diameter of the lower part of the outer wall 6 through the stepped surface 7 .

[0017] The yoke side wall 8 is erected from the bottom plate 5. The yoke side wall 8 is an inner wall opposite to the lower part of the outer wall 6 with a predetermined gap. The circular yoke base plate 9 formed at the central part of the inside of 8 forms a bottomed cylindrical yoke 10 lower than ...

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PUM

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Abstract

The invention provides a speaker comprising: a magnetic circuit 3; a vibration system 4 in which a diaphragm 22 is attached to a voice coil 21; and a frame 2 which supports the magnetic circuit 3 and the vibration system 4. The voice coil 21 is placed in a magnetic gap 17. By taking advantage of the characteristics of a plastic magnet that it can be easily processed into a desired shape, the magnetic circuit 3 is configured by: a plastic magnet 16 having a T-like section shape; and a yoke 10 which is continuously disposed in a bottom portion side and periphery of the plastic magnet 16. The number of components of the magnetic circuit, which conventionally has the three-piece structure, is reduced, so that the mass productivity of a small and thin speaker can be enhanced.

Description

technical field [0001] The present invention relates to a small and thin speaker used in cellular phones and the like. Background technique [0002] Conventionally, a speaker (dynamic speaker: dynamic speaker) using a plastic magnet (plastic magnet) in a magnetic circuit is known, for example, in Patent Document 1 or the like. However, in terms of the component structure and assembly of the magnetic circuit, it is the same as a speaker using a general (ferrite, alnico permanent magnet alloy, rare earth, etc.) metal magnet. For the magnetic circuit, no matter what kind of magnet is used, it is necessary to glue and assemble three parts: the magnet, the yoke (yoke) and the pole piece (pole piece). [0003] Patent Document 1: JP-A-2000-32589. [0004] Conventional loudspeakers are greatly affected by the adhesive used to assemble the magnetic circuit, making it difficult to increase mass production capability. Contents of the invention [0005] The present invention has be...

Claims

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Application Information

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IPC IPC(8): H04R9/06H04R9/02
CPCH04R9/10H04R9/025
Inventor 上村智彦汤浅英夫
Owner HOSIDEN CORP
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