JPH0626289Y2 - Magnetic trinkets - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a magnetic accessory using a precious metal, and more specifically, to a magnetic pole of a flat chain magnetic accessory composed of a gold-platinum-cobalt permanent magnet alloy. It is about arrangement.

[Conventional technology]

A magnetic health device designed in the form of a necklace or bracelet has been commercialized as a magnetic accessory. In these magnetic accessories, rod-shaped or plate-shaped rare earth magnets are enclosed in a metal container and connected in a chain. When a bar magnet is used, it is magnetized in the radial direction or the axial direction, and when a plate magnet is used, it is magnetized in the thickness direction.

By the way, since the accessory as a rare metal is not valued as a precious metal, a precious metal magnet alloy, particularly a gold magnet alloy, which can be a precious metal has been required.

The present inventors have developed a gold-platinum-cobalt-based permanent magnet alloy to meet such demands (Japanese Patent Laid-Open No. 62-18584).
6).

This alloy is a composite material of gold and platinum-cobalt alloy,
A flat chain accessory can be obtained by chain knitting or precision casting.

[Problems to be solved by the device]

The rare earth magnet used in the conventional magnetic accessory is the strongest magnet material known at present, and by comparison with this, the magnetic characteristics of the gold-platinum-cobalt permanent magnet, which is the subject of the present invention, is clear. Is inferior to.

Therefore, unless the arrangement of the magnetic poles determined by the shape of the accessory and the direction of its magnetization is optimized, a sufficient magnetic flux density cannot be obtained, and the effect as the magnetic accessory cannot be exhibited.

In order to efficiently magnetize a single magnet, it is advantageous to magnetize in the direction of the highest permeance coefficient determined by the shape of the magnet. For rod-shaped or plate-shaped magnets,
The permeance coefficient corresponding to the dimensional ratio, that is, the ratio of length (thickness) to width (diameter) has been empirically obtained.
When an anisotropic material such as a ferrite magnet or a rare earth magnet is used, the direction of magnetization has already been defined at the design stage.

On the other hand, the gold-platinum-cobalt permanent magnet alloy, which is the contrast of the present invention, can be magnetized in any direction because it is an isotropic material, but especially for a flat chain magnet piece. The permeance coefficient is also unpredictable. Further, since the flat chain has a flattened shape by twisting a simple round chain in one direction, it does not twist in one direction, but twists in the opposite direction. When such a flat chain is magnetized,
Twisting may occur due to the magnetic repulsive force of each piece, and the appearance of the accessory is impaired.

Therefore, an object of the present invention is to compare a flat-chained accessory made of a gold-platinum-cobalt-based permanent magnet alloy, which is an isotropic magnet material having a relatively low magnetic flux density and a relatively high coercive force, as a contrast. It is to determine the most advantageous direction of magnetization.

[Means for Solving the Problems]

In order to solve the above problems, in the present invention, gold-platinum-
Several kinds of flat chain jewelry were made by using cobalt-based permanent magnet alloy by chain-knitting or precision casting, and the magnetic flux density was measured by changing the magnetization direction. It was found that the accessory is magnetized from the lower surface at one end in the width direction to the lower surface at the other end. Hereinafter, an embodiment will be described with reference to the drawings.

〔Example〕

1 to 3 are bottom views of essential parts of the magnetic accessory of the present invention.

FIG. 1 is a bottom view showing a part (five pieces) of a flat chain-shaped jewelry called a Kihei chain, which is created by chain-knitting a wire rod. The lower surface is flatly cut and has a substantially elliptical cut surface 11, 12
Is occurring.

In the plane including the flat chain, when the direction orthogonal to the longitudinal direction (connecting direction) of the chains (vertical direction in the figure) is the width direction, this accessory goes from the lower surface of one end in the width direction to the lower surface of the other end. Since it is magnetized, a magnetic pole of polarity N is formed on the cut surface 11 on the lower surface at one end, and a magnetic pole of polarity S is generated on the cut surface 12 on the lower surface at the other end. On the other hand, although some leakage magnetic flux is recognized on the upper cut surface (not shown), substantially no magnetic pole is generated.

FIG. 2 is a bottom view showing a part (five pieces) of jewelry on a flat chain called almond which is made by precision casting. The lower surface 22 at one end is magnetized from the lower surface 21 at one end toward the lower surface 22 at the other end so that an S pole is generated.

FIG. 3 is a bottom view showing a part (for four frames) of a flat chain-shaped accessory called Marin Kihei, which is created by precision casting or forging.

Also in this case, the lower surface 31 at one end in the width direction to the lower surface 3 at the other end
The bottom surface 31 at one end has an N pole, and the bottom surface 32 at the other end has an S pole.

FIG. 4 is a cross-sectional view in the width direction of the flat chain accessory for explaining the direction of magnetization. Although the cross-section in the width direction of the flat chain accessory shown in FIGS. 1 to 3 has an extremely complicated shape, it is simplified and shown in an oval shape in FIG.

The direction of magnetization is as shown by the arrow in FIG.
The width direction from one end 41 in the width direction to the other end 42 (see FIG. 4).
(a)), the thickness direction from the upper surface 43 to the lower surface 44 (see FIG. 4).
(b)) and the direction from the lower surface 441 at one end to the lower surface 442 at the other end (FIG. 4 (c)).

A plane-cut Kihei chain as shown in Fig. 1 was made from a gold-platinum-cobalt-based permanent magnet alloy wire with a wire diameter of 1.5 mm.
The following table shows the results of observing the magnetic flux density generated in the magnetic poles and the twisted state of the chains when magnetized in the respective directions of FIGS. (A), (b), and (c).

When magnetized in the width direction as shown in FIG. 4 (a), a relatively high magnetic flux density is obtained, but due to the repulsive force between the magnetic poles of the same polarity, the chains are significantly twisted so as to contract in the longitudinal direction.

When magnetized in the thickness direction as shown in FIG. 4 (b),
Since the magnetic poles generated on the upper and lower surfaces are close to each other, the demagnetizing field becomes large, and the resulting magnetic flux density decreases. Also,
A moderate degree of twist is also noted.

On the other hand, as shown in Fig. 4 (c), when magnetized from the lower surface of one end to the lower surface of the other end, the highest magnetic flux density is obtained, and each piece is oriented in a direction to prevent twisting. No twisting occurs at all because of the suction force.

The above results are described with respect to the Kihei flat chain shown in FIG. 1, but qualitatively neither in the almond type flat chain shown in FIG. 2 nor in the marine Kihei flat chain shown in FIG. The same result was observed.

FIG. 5 is a cross-sectional view of an essential part showing an example of a magnetizing device used for magnetizing the magnetic accessory of the present invention.

The magnetizing yoke 50 is a rectangular bar member made of electromagnetic soft iron provided with a groove 51 in the longitudinal direction, and a large current conducting wire 52 is embedded in the groove. The length of the groove is substantially equal to the entire length of the accessory, and the upper portion of the groove 51 forms a gap 53 which is substantially equal to the distance between the lower surfaces 441 and 442 at both ends in the width direction of the accessory 4.

When the accessory 4 is placed along the groove 51 and a large current is instantaneously applied to the conducting wire 52, all pieces of the accessory can be magnetized at once in a desired direction by a so-called one-turn method.
A broken line 54 in the drawing is an imaginary line showing the distribution of magnetic force lines.

The above description is an example in which the entire flat chain jewelry is made of all-magnet alloy and all the pieces are magnetized, but the magnet pieces and the non-magnetic pieces are made of precious metal pieces having different colors or shapes. It is also highly decorative that it is constructed and that these are connected alternately. In this case, the problem of twist is alleviated, but the maximum magnetic flux density can be obtained by selecting the same direction as the magnetizing direction of the magnet pieces.

[Effect of device]

As described above, the present invention uses a gold-platinum-cobalt-based permanent magnet alloy that has clearly lower magnetic properties than the rare earth magnets used conventionally, and maximizes its workability and magnetic properties. It proposes a shape and a magnetizing direction to be exhibited to the limit, and a genuine precious metal magnetic accessory can be realized only by adopting the configuration of the present invention.

[Brief description of drawings]

1 to 3 show the magnetic accessory of the present invention,
Fig. 2 is a bottom view of a plane cut Kihei chain, Fig. 2 is a bottom view of an almond type flat chain, Fig. 3 is a bottom view of a marine Kihei type flat chain, and Fig. 4 (a) (b) (c) is FIG. 5 is a cross-sectional view in the width direction of the flat chain accessory for explaining the direction of magnetization, and FIG. 5 is a cross-sectional view of an essential part showing an example of a magnetizing device used for magnetizing the magnetic accessory of the present invention. 4 ... Jewelry, 11, 21, 31, 441 ... lower surface at one end in the width direction, 12, 22, 32, 442 ... lower surface at the other end in the width direction.

Claims (1)

[Scope of utility model registration request] 1. An accessory in which noble metal ring-shaped pieces are connected in a flat chain shape twisted in one direction, at least a part of the ring-shaped pieces is made of a gold-platinum-cobalt-based permanent magnet alloy. A magnetic accessory characterized by being magnetized in an inverted U-shape from the lower surface of one end in the width direction of a chain-shaped accessory to the lower surface of the other end.