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Yoke of speaker

A speaker and cut-out technology, applied in the field of speakers, can solve the problem of limited thinning of speakers

Inactive Publication Date: 2005-02-09
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, a certain amount of space must be left between the diaphragm 105 and the yoke 101, so there is a limit to the reduction in thickness of conventional speakers.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] FIG. 1 is a sectional view of a speaker according to an embodiment of the present invention, and FIG. 2 is a plan view of a coil and a yoke as main parts of the speaker.

[0014] As shown in FIG. 1 , the bottomed cylindrical yoke is made of a magnetic material such as iron. The frame 2 made of resin is fixed to the outer periphery of the yoke by crimping or fitting. The magnet 3 is adhesively bonded to the bottom surface of the yoke 1 with a certain distance from the inner surface 1a of the side wall of the yoke 1 . The pole plate 4 is adhesively bonded to the upper surface of the magnet 3 and forms a magnetic gap 4a with the inner surface 1a of the yoke 1 . The vibrating membrane 5 is formed of a resin sheet. The voice coil 6 is located in the magnetic gap 4a, and one end thereof is glued and fixed to the lower part of the vibrating membrane 5 .

[0015] One end of the voice coil 6 is glued and fixed to the lower part of the vibrating membrane 5, and the other end i...

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PUM

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Abstract

In a loudspeaker, even if an interval between a diaphragm and a yoke is small, a lead wire, an end of the coil wire of a voice coil, moves upward and downward in and / or over a cutout portion formed in the yoke, and does not collide with the yoke. The loudspeaker does not have disadvantages, such as noises and disconnection of the end of the coil wire, and can be thin.

Description

technical field [0001] The present invention relates to speakers used in portable communication devices such as mobile phones. Background technique [0002] A loudspeaker having a magnetic circuit composed of a yoke and a magnet 3 and integrally formed with a frame is disclosed, for example, in JP-A-4-362900. [0003] Fig. 4 is a sectional view of a conventional speaker. The bottomed cylindrical yoke 101 is made of a magnetic material such as iron. The frame 102 made of resin is fixed to the outer periphery of the yoke 101 by crimping or fitting. The magnet 103 is adhesively bonded to the bottom surface of the yoke 101 with a certain distance from the inner surface of the side wall of the yoke 101 . The pole plate 104 is adhesively bonded to the upper surface of the magnet 103 and forms a magnetic gap 104 a with the inner surface 101 a of the yoke 101 . The vibrating membrane 105 is formed of a resin sheet. The voice coil 106 is located in the magnetic gap 104a, and one...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R9/02H04R1/06H04R9/00
CPCH04R9/025H04R1/06H04R9/02
Inventor 矢野博
Owner PANASONIC CORP