Electromagnetic transducer and portable communication device

A transducer and electromagnetic technology, applied in the fields of electro-acoustic transducers and portable communication devices, can solve the problems of reduced driving force, inability to achieve sound pressure level, etc., and achieve the effect of reducing mass and strong magnetic gap value

Inactive Publication Date: 2004-09-01
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, although it is necessary to ensure a large amplitude (and thus a large magnetic gap value) in order to obtain a high sound pressure level and to perform regeneration in the low frequency range, such a large magnetic gap value will inevitably lead to The driving force is reduced, and the purpose of obtaining a higher sound pressure level cannot be achieved

Method used

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  • Electromagnetic transducer and portable communication device
  • Electromagnetic transducer and portable communication device
  • Electromagnetic transducer and portable communication device

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0056] An electromagnetic transducer 1000 according to Example 1 of the present invention will be described below with reference to FIGS. 1A , 1B, 1C, 1D and 2 .

[0057] FIG. 1A is a cross-sectional view of an electromagnetic transducer 1000 according to Example 1 of the present invention. figure 2 is the magnetic flux vector diagram of the electromagnetic transducer 1000 according to Example 1 of the present invention. figure 2 The magnetic flux vector diagram of FIG. 2 shows only half of the electromagnetic transducer 1000 relative to the central axis (shown on the left side of the figure).

[0058] As shown in Fig. 1A, according to the electromagnetic transducer 1000 of the example 1 of the present invention, comprise a cylindrical first housing 7 and a yoke 6 (which is arranged to cover the lower surface of the first housing 7 disk-shaped). At the center portion of the yoke 6 is provided a center pole 3 which may constitute a part of the yoke 6 . Coil 4 surrounds cen...

example 2

[0072] An electromagnetic transducer 2000 according to Example 2 of the present invention will be described below with reference to FIGS. 4A , 4B and 5 .

[0073] 4A and 5 are respectively a cross-sectional view and a magnetic flux vector diagram of an electromagnetic transducer 2000 according to Example 2 of the present invention. Figure 5 The magnetic flux vector diagram of FIG. 1 shows only half of the electromagnetic transducer 2000 relative to the central axis (shown on the left side of the figure).

[0074] According to the electromagnetic transducer 2000 shown in FIG. 4A, a ring-shaped second magnet 9 as shown in the plan view of FIG. 4B is arranged above the second diaphragm 2 with a magnetic gap therebetween. The second magnet 9 is supported by a second housing 10 . A plurality of holes 12 for transmitting sound generated by the first and second diaphragms 1 and 2 and the cover 13 to an external space outside the second case 10 are provided in the second case 10 . ...

example 3

[0091] An electromagnetic transducer 3000 according to Example 3 of the present invention will be described below with reference to FIGS. 8A , 8B and 9 .

[0092] 8A and 9 are respectively a cross-sectional view and a magnetic flux vector diagram of an electromagnetic transducer 3000 according to Example 3 of the present invention. The flux vector diagram of FIG. 9 shows only half of the electromagnetic transducer 3000 relative to the central axis (shown on the left side of the figure).

[0093] The electromagnetic transducer 3000 shown in Fig. 8A comprises a second diaphragm 22 having an L-shaped cross-section at its inner periphery, one is arranged above the second diaphragm 22, and there is a second diaphragm 22 therebetween. magnetic gap of the ring-shaped second magnet 29, and a such as Figure 8B The annular second thin magnetic plate 24 is shown in plan view.

[0094] The second magnet 29 is supported by a second housing 20 . The second case 10 has a concave portion ...

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PUM

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Abstract

An electromagnetic transducer includes: a first diaphragm; a second diaphragm provided in a central portion of the first diaphragm, the second diaphragm comprising a magnetic material having a first opening in a central portion thereof; a yoke disposed so as to oppose the first diaphragm; a center pole disposed between the yoke and the first diaphragm, wherein the center pole has a shape which allows insertion into the first opening; a coil disposed so as to surround the center pole; and a first magnet disposed so as to surround the coil.

Description

technical field [0001] The present invention relates to an electroacoustic transducer used in a portable communication device such as a cellular phone or a pager for reproducing an alarm sound or a melody sound in response to an incoming call and for reproducing speech and the like. Background technique [0002] 12A and 12B are respectively a plan view and a cross-sectional view of a conventional electromagnetic type electroacoustic transducer (hereinafter referred to as "electromagnetic transducer") 200 . A conventional electromagnetic transducer 200 includes a cylindrical housing 107 and a disk-shaped yoke 106 configured to cover the lower surface of the housing 107 . At the center portion of the yoke 106, a center pole 103 constituting a part of the yoke 106 is provided. The coil 104 is wound around the center pole 103 . An annular magnet 105 is arranged at a distance from the outer periphery of the coil 104, and an appropriate distance is maintained between the coil 10...

Claims

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Application Information

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