Loudspeaker

A technology of loudspeaker and magnetic circuit, applied in the field of loudspeakers, can solve the problems of vibration plate 37 amplitude motion restriction, air resistance increasing, etc.

Inactive Publication Date: 2007-09-19
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, since the air flow path becomes longer, the air resistance becomes larger, so that the amplitude movement of the vibrating plate 37 is restricted.
As a result, there is a problem that the reproduced sound pressure in the low frequency region may be suppressed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0034] Embodiment 1 will be described below using FIGS. 1 to 3 . The magnetic circuit 1 is formed by laminating and coupling a disk-shaped magnet 3 and a plate 4 in a pot-shaped yoke 2 . Thus, an annular magnetic gap 5 is formed. The frame 6 made of resin couples the magnetic circuit 1 at the center. Vent holes 6 a are provided in the frame 6 . Voice coil 7 is movably fitted in magnetic gap 5 formed in magnetic circuit 1 . A plurality of notches 7a are provided at the upper end of the bobbin constituting the voice coil 7 . Vibration plate 8 is bonded to voice coil 7 at the center, and its outer periphery is bonded to the periphery of frame 6 . Edge portion 8 a is integrally provided on the periphery of diaphragm 8 . The outer periphery of the edge portion 8 a is joined to the peripheral edge of the frame 6 . In addition, voice coil 7 and diaphragm 8 are bonded using adhesive 9 . Furthermore, as shown in FIG. 3 , the bonding is performed so that the adhesive 9 does not c...

Embodiment approach 2

[0037] The communication structure of the present embodiment is different from the communication structure described in the first embodiment in which the gap formed between the rear surface of the diaphragm of the speaker and the inside of the voice coil communicates with the outside. The rest of the configuration is the same as that of Embodiment 1, so the same reference numerals are assigned to the same parts and detailed description thereof will be omitted, and only different parts will be described.

[0038] Description will be made using FIGS. 5 to 6B. A plurality of holes 10 a are provided on the periphery of the bottom surface of the pot-shaped yoke 10 . Thus, the magnetic circuit 12 in which the annular magnetic gap 11 is formed is formed.

[0039] In the speaker according to the present embodiment configured in this way, the gap formed between the back surface of the diaphragm 8 and the inside of the voice coil 13 communicates with the outside through the hole 10 a p...

Embodiment approach 3

[0042] The communication structure of the present embodiment is different from the communication structure described in the first embodiment in which the gap formed between the rear surface of the diaphragm of the speaker and the inside of the voice coil communicates with the outside. The rest of the configuration is the same as that of Embodiment 1, so the same reference numerals are assigned to the same parts and detailed description thereof will be omitted, and only different parts will be described.

[0043] Description will be given using FIGS. 8 to 9B . A plurality of notches 14 a are provided on the side wall of the pot-shaped yoke 14 . Thus, the magnetic circuit 16 in which the annular magnetic gap 15 is formed is formed.

[0044] In the speaker according to the present embodiment configured in this way, the gap formed between the back surface of the diaphragm 8 and the inside of the voice coil 13 communicates with the outside through the notch 14 a provided on the si...

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PUM

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Abstract

A loudspeaker includes a frame connected to a magnetic circuit having a magnetic gap and a diaphragm having an outer circumference connected to the frame and connected around a voice coil embedded into the magnetic gap. A communication groove is provided for communicating a void portion formed between the rear surface of the diaphragm and the inner part of the voice coil, with outside. Thus, it is possible to shorten the air flow route on the diaphragm rear surface so as to reduce the air flow resistance and accordingly, to increase the reproduction sound pressure of the low range.

Description

technical field [0001] The present invention relates to speakers used in various audio equipment and information communication equipment, and more particularly to a small and thin speaker suitable for mobile phones and the like. Background technique [0002] With the miniaturization and multi-functionalization of various audio equipment and information communication equipment, the speakers used in these equipment are also increasing and gradually miniaturized. Especially in the speakers used in mobile phones, not only miniaturization but also High sound quality and stereo correspondence are required. [0003] FIG. 18 is a cross-sectional view showing the structure of such a conventional speaker. The magnetic circuit 31 is configured by laminating and coupling a disk-shaped magnet 33 and a plate 34 in a pot-shaped yoke 32 to form an annular magnetic gap 35 . [0004] A vent hole 36a is provided in the frame 36 in which the magnetic circuit 31 is integrated at the center. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R9/04H04R9/02H04R1/28
CPCH04R9/025H04R31/006H04R1/225H04R9/06H04R9/045
Inventor 矢野博本田一树隅山昌英
Owner PANASONIC CORP
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