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Magnetic circuit

A technology of magnetic circuit and yoke, applied in the field of magnetic circuit, can solve the problem of not being able to achieve high air-gap magnetic flux density

Inactive Publication Date: 2008-10-01
MINEBEA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, if the outer diameter of the antimagnetic type magnetic circuit 101 has an upper limit due to space constraints, the main magnet 104 faces a larger limit and may prevent the main magnet 104 from having an appropriate outer diameter, resulting in failure to achieve a high air-gap magnetism. Flux density

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0025] refer to figure 1 A, The magnetic circuit 1 according to the first embodiment of the present invention includes: a lower yoke 2; a central pole 3 arranged at the center of the front surface of the lower yoke 2 to protrude forward (upward in the figure); The magnet 4, which is formed in a ring shape and is arranged on the front surface of the lower yoke 2; the top plate 5, which is formed in a ring shape and is arranged on the front surface of the main magnet 4; the repulsion magnet 6, which is formed in a solid cylinder and and a yoke cover 7 formed (eg, in the drawing) of a pot-like configuration having a circular hollow cylindrical portion and a bottom plate, and arranged to cover the back and sides of the repelling magnet 6 .

[0026] Although in figure 1 The outer diameter of the yoke cover 7 in A is set equal to the outer diameter of the main magnet, but alternatively, the outer diameter of the yoke cover 7 may be smaller than that of the main magnet 4 . The fron...

no. 2 example

[0043] will refer to image 3 with Figure 4 A second embodiment according to the present invention will be described. In showing the second embodiment of image 3 , denoted with the same reference numerals as the figure 1 The components in A correspond to any components, and a detailed description thereof will be omitted below.

[0044] refer to image 3 , the magnetic circuit 1a according to the second embodiment and the magnetic circuit according to the first embodiment figure 1 The difference of the magnetic circuit 1 of A is only that it also includes a spacer 9, and the following description will focus on the same figure 1 The difference of magnetic circuit 1 of A.

[0045] The spacer 9 is formed in a ring shape, is made of a non-magnetic material such as resin, and is provided on the inner periphery of the frontmost portion of the yoke cover 7 .

[0046] The inner diameter of the spacer 9 is substantially equal to the outer diameter of the lower yoke 2 , whereby ...

no. 3 example

[0052] will refer to Figure 5A , Figure 5B with Image 6 A third embodiment of the present invention will be described.

[0053] In showing the magnetic circuit 1b according to the third embodiment Figure 5A , denoted with the same reference numerals as the figure 1 A corresponds to any component, and detailed description thereof will be omitted below, focusing on differences from the foregoing embodiments.

[0054] The magnetic circuit 1b according to the third embodiment differs from the magnetic circuits 1 and 1a according to the first and second embodiments in the structure and arrangement of the yoke cover. Specifically, refer to Figure 5A The yoke cover 7a of the magnetic circuit 1b is configured to have an inner diameter approximately equal to the outer diameter of the main magnet 4, and is arranged to partially surround the main magnet 4 so that a part of the inner peripheral surface of the yoke cover 7a is in contact with the main magnet 4. A part of the out...

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PUM

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Abstract

A magnetic circuit is provided which includes: a bottom yoke; a center pole disposed at the center of the front of the bottom yoke; a main magnet having a ring shape and disposed at the front of the bottom yoke; a top plate having a ring shape and disposed at the front of the main magnet; a repulsion magnet disposed at the rear of the bottom yoke; and a yoke cover disposed to cover the rear and side of the repulsion magnet, wherein the yoke cover has an outer diameter dimensioned equal to or smaller than the outer diameter of the main magnet, whereby the magnetic flux density at the air gap g can be enhanced. Thus, the magnetic circuit described above achieves an excellent magnetic efficiency.

Description

technical field [0001] The invention relates to a magnetic circuit which may be included in a speaker. Background technique [0002] FIG. 9A is a schematic sectional view of a conventional antimagnetic type magnetic circuit 101, and FIG. 9B is an explanatory diagram of the right side of the magnetic circuit of FIG. 9A, showing magnetic flux flowing through the magnetic circuit. [0003] The antimagnetic type magnetic circuit 101 of FIG. 9A includes: a lower yoke 102; a central pole 103, which is arranged at the center of the front surface (upper side in the figure) of the lower yoke 102 to protrude forward (upward in the figure); The main magnet 104, which is formed in a ring shape and is arranged on the front surface of the lower yoke 102; the ring-shaped top plate 105, which is arranged on the front surface of the main magnet 104; the repulsion magnet 106, which is formed in a ring shape and is arranged on the lower magnetic yoke the back side of the yoke 102 ; and a pot-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R9/02H04R9/06
CPCH04R9/025H01F7/0289H04R2209/022H01F7/021
Inventor 佐藤荣二
Owner MINEBEA CO LTD