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Ring magnet and its loudspeaker

A loudspeaker, ring magnet technology, applied in the direction of sensors, inductors/transformers/magnets, magnetic materials, etc., can solve the problems of insufficient linearity and/or peak value, difficulty, and practicality of increasing the thrust of the voice coil.

Inactive Publication Date: 2006-02-08
HITACHI METALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, measures to increase voice coil thrust are practically difficult
In addition, if the existing ring magnets 5a, 5b are used to form a dynamic speaker, the linearity and / or peak value of the effective gap magnetic flux density distribution linked to the movable voice coil arranged in the magnetic gap is not high enough. all clear

Method used

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  • Ring magnet and its loudspeaker
  • Ring magnet and its loudspeaker
  • Ring magnet and its loudspeaker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Nd, Dy, the total weight of B and Fe are counted as 100%, and the alloy coarse powder with 30.5% Nd-1.5% Dy-1.1% B-the rest being Fe (weight %) as the main component is in an inert atmosphere. Jet powder machine pulverized into fine powder, made into fine powder with an average particle diameter of 4.3 μm. These powders were filled in a mold (not shown in the figure), and subjected to heat treatment by compression molding while applying a magnetic field oriented in the radial direction corresponding to FIG. 1 . at about 7 x 10 -2 Pa (about 5×10- 4 The obtained molded body was sintered by heating at 1100° C. for 2 hours in a vacuum of Torr), and then cooled to room temperature. Next, after heating at 900° C. for 2 hours in an Ar atmosphere, it was cooled to 600° C., and then, after heating at 600° C. for 2 hours, it was cooled to room temperature. The obtained sintered body is processed into a prescribed ring shape, after which thermosetting epoxy resin is deposited o...

Embodiment 2

[0053] In addition to the applied magnetic field during compression molding as a corresponding figure 2 Except for the radial orientation magnetic field, the ring magnet 21 was produced and evaluated in the same manner as in Example 1. figure 2 In , the central axis is identified by 25 , the boundaries of the regions 22a and 22b are identified by 23 , and the average magnetic field lines are identified by 26 . According to the magnetic field analysis results, as shown in Table 1, the ring magnet of this embodiment has figure 2 This can be clearly seen in the radially anisotropic region shown.

Embodiment 3

[0061] For the speaker 50 shown in FIG. 4( a ), as shown in FIG. 4( b ), the gap magnetic flux density in the magnetic gap 57 was measured when moving up and down from the center position O of the magnetic gap 57 . There is a center position O on the extension line of the center line 60 which divides the ring magnet 11 into two parts in the axial direction. The measurement results are shown in Figure 5 middle.

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Abstract

A ring magnet having improved linearity and / or peak value in a space magnetic flux density distribution, comprising at least one first radially anisotropic region having a radial anisotropy direction of 89 DEG or more relative to a center axis thereof, and at least one second radially anisotropic region having a radial anisotropy direction of 40 DEG or more and less than 89 DEG relative to a center axis thereof, the first and second radially anisotropic regions being arranged along the center axis such that a space magnetic flux density distribution on an inner or outer surface of the ring magnet has increased linearity and / or peak value.

Description

technical field [0001] The invention relates to a radial anisotropic ring magnet and a loudspeaker. Compared with the existing ring magnet, the linearity and / or peak value of the gap magnetic flux density distribution of the ring magnet is improved. The loudspeaker uses the radial anisotropy Anisotropic ring magnets improve linearity and / or peaking of voice coil thrust. Background technique [0002] Hitherto, dynamic speakers have been widely used. The so-called moving coil speaker refers to: a magnetic gap that generates voice coil thrust is formed by a magnet and a yoke, and the voice coil combined with the vibration system is movably arranged in the magnetic gap, and the voice coil is driven The electric current makes the vibrating system vibrate, which results in the loudspeaker of the sound. [0003] Figure 6 It represents the cross-section of the main part of the existing dynamic speaker. exist Figure 6 Among them, a substantially conical upper frame 1a and a subs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F7/00H01F1/053H04R9/06H04R9/02H01F1/08H01F7/02H01F41/02H02K15/03H02K33/18H04R13/00
CPCH04R9/025H01F41/028H01F7/0284
Inventor 清水元治大长启之
Owner HITACHI METALS LTD
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