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Electromagnetic transducer and portable communication equipment

A technology of communication devices and transducers, applied in the direction of sensors, electrical components, planar diaphragms, etc., can solve problems such as the difficulty of the first diaphragm

Inactive Publication Date: 2010-06-02
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, it is difficult to make the first diaphragm 100 have a thickness that allows it to be used as a magnetic circuit while preventing magnetic saturation, especially if the first diaphragm 100 is designed to have a thickness equal to that which is expected to be reproduced as a resonant frequency of the frequency of an alert sound when

Method used

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  • Electromagnetic transducer and portable communication equipment
  • Electromagnetic transducer and portable communication equipment
  • Electromagnetic transducer and portable communication equipment

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0045] will refer to figure 1 with 2 An electromagnetic transducer 10 according to Example 1 of the present invention will be described. figure 1 is a sectional view showing the electromagnetic transducer 10 according to Example 1 of the present invention. Such as figure 1 As shown, the electromagnetic transducer 10 includes a cylindrical housing 7 and a disk-shaped yoke 6 configured to cover the bottom surface of the housing 7 . In the central portion of the yoke 6 is provided a center column 3 which forms an integral part of the yoke 6 . A coil 4 is wound around the central column 3 . A ring magnet 5 is provided spaced apart from the outer periphery of the coil 4, around the entire circumference of the ring magnet 5, maintaining an appropriate gap between the coil 4 and the inner periphery of the ring magnet 5. The outer peripheral surface of the magnet 5 abuts against the inner peripheral surface of the case 7 . On the upper surface of the magnet 5, a thin annular ...

example 2

[0052] image 3 is a sectional view showing the electromagnetic transducer according to Example 2 of the present invention. exist image 3 In the shown electromagnetic transducer, a concave portion for neatly receiving a thin magnetic plate 19 for fixing the thin magnetic plate 19 to the magnet 15 is provided on the upper inner periphery of the magnet 15 . In other respects, the electromagnetic transducer of this example has the same figure 1 The electromagnetic transducer shown in Example 1 has the same structure. The inner periphery of the thin magnetic plate 9 extends beyond the inner circumference of the magnet 5 ; that is, the inner diameter of the thin magnetic plate 19 is smaller than the inner diameter of the magnet 15 .

[0053] According to the electromagnetic transducer of this example, since the thin magnetic plate 19 is neatly received by the concave portion formed in the magnet 15, the attractive force generated by the magnet 5 and the driving force on the se...

example 3

[0058] Image 6 is a sectional view showing the electromagnetic transducer 10 according to Example 3 of the present invention. exist Image 6 In the shown electromagnetic transducer, a magnet 15 is arranged so that there is a gap between the outer peripheral surface of the magnet 15 and the inner peripheral surface of a housing 7, and multiple gaps are formed at predetermined intervals along the circumferential direction of a yoke 26. 28 air holes. These air holes 28 allow the gap between the outer peripheral surface of the magnet 15 and the inner peripheral surface of the housing 7 to communicate with the external space other than the space between the first diaphragm 1 and the yoke 26 . In other respects, the electromagnetic transducer 10 of this example has the same image 3 The electromagnetic transducer 10 of Example 2 shown has the same structure.

[0059] According to the electromagnetic transducer 10 of the present example, the air existing between the outer periph...

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PUM

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Abstract

An electromagnetic transducer, includes: a first diaphragm disposed in a vibratile manner; a second diaphragm provided in a central portion of the first diaphragm, the second diaphragm being formed ofa magnetic material; a yoke disposed in a position opposing the first diaphragm; a center pole provided on a face of the yoke that opposes the first diaphragm; a coil substantially surrounding the center pole; a magnet substantially surrounding the coil; and a thin magnetic plate provided between the magnet and the first diaphragm, an inner periphery of the thin magnetic plate being in overlapping relation to an outer periphery of the second diaphragm.

Description

technical field [0001] The present invention relates to an electroacoustic transducer for use in a portable communication device, such as a cellular telephone or a pager, for reproducing an alert sound in response to a received call. Background technique [0002] Figure 9A with 9B A plan view and a cross-sectional view of a conventional electromagnetic type electroacoustic transducer (hereinafter referred to as "electromagnetic transducer") are shown. The conventional electromagnetic transducer includes a cylindrical housing 107 and a disk-shaped yoke 106 configured to cover the bottom surface of the housing 107 . In the central portion of the yoke 106 there is provided a central post 103 which may form an integral part of the yoke 106 . A coil 104 is wound around the central post 103 . A ring magnet 105 is provided at a distance from the outer periphery of the coil 104 , and surrounds the entire circumference of the ring magnet 105 , with an appropriate gap between the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R13/00H04R9/00H04R13/02
CPCH04R13/02H04R7/04H04R2499/11H04R9/00
Inventor 薄木佐和子佐伯周二
Owner PANASONIC CORP