JP2526785Y2 - Magnetic field detector - Google Patents

Description

[Detailed description of the invention]

[0001]

Industrial Applicability The present invention relates to an N pole and an S pole in a magnet.
The present invention relates to a magnetic field detector capable of easily determining the polarity of a pole with good sensitivity and visibility.

[0002]

2. Description of the Related Art Conventionally, as a device for discriminating the polarities of an N pole and an S pole of a magnet, in addition to a large-scale magnetic flux density measuring device such as a Gauss meter, the same inventor as shown in FIG. There is a simple magnetic line of force detector 21 that has been issued.

The magnetic field line detector 21 has a pair of N-poles 22a and S-poles 22b arranged in one axial direction, each of which is coated in red and yellow with a spherical magnet body 22 made of an acrylic resin material or the like. It is housed rotatably in the center of a transparent container 23.

When the magnetic field line detector 21 is placed on the surface of the magnet whose polarity is to be determined and the magnet body 22 faces the red side, the magnet surface faces the N pole and the yellow side faces up. In this case, it can be easily determined that the magnet surface is the south pole. The magnetic force line detector 21 having such a simple structure
Is excellent in that the polarity of the magnet can be easily determined without using an expensive measuring device such as a magnetic flux density measuring device.

[0005]

However, in the magnetic field line detector 21, in order to determine the polarity of a magnet having a weak magnetic field, it is necessary that the magnetic body can easily change the direction of the magnetic pole. Although it is necessary to reduce the size of the magnet body as much as possible to reduce the weight, there is a problem in that the smaller the diameter of the magnet body, the more difficult to display the polarity display and the lower the visibility.
Conversely, in order to ensure a certain level of visibility, the sensitivity of the polarity discrimination has to be reduced.

Therefore, the present invention has an object to provide a simple magnetic field line detector which can easily determine the polarity of the magnet and detect the magnetic field lines with extremely high sensitivity and excellent visibility. I do.

[0007]

In order to achieve the above-mentioned object, the magnetic field detector according to the present invention has a pair of N pole and S pole in one axial direction.
A spherical magnet body with poles arranged and identified by color etc. is rotatably housed in a container that can be seen from the outside,
A convex lens body is attached to the front surface of the magnet body housing portion in the container body, and the convex lens in the container body is formed.
On the surface opposite to the surface where the
And a plurality of micromagnetic scales and a dye under the film.
With a highly viscous liquid in a substantially spherical membrane.
Microcapsule layer with many microcapsules adhered
And a light absorbing layer under the microcapsule layer
The magnetic detection sheet is provided.

Further, a display indicating the relationship between the identification display of the magnet body and the polarity may be engraved on the bottom surface of the container body.

[0009]

The present invention is characterized in that a pair of N poles and S poles are arranged in one axial direction, and a spherical magnet body which is identified and identified by a color or the like is rotatably housed in a container body which can be seen from the outside. forming Then attach the lens body in front of the magnet housing portion in
In both cases, the convex lens body in the container body is attached and formed.
On the opposite side, a transparent protective film,
Below, a plurality of fine magnetic scales and dyes are combined with a highly viscous liquid.
Many microcapsules are enclosed in a substantially spherical membrane.
A microcapsule layer having several adherences,
A magnetic detection sheet made by laminating a light absorbing layer under
With this arrangement, the magnet body can be easily rotated with a small diameter and the direction of the magnetic pole can be changed even with a small magnetic field, and the identification of the small-diameter magnet body is enlarged by the convex lens body, resulting in excellent visibility. The polarity can be easily determined. In addition, the north pole and the south pole are alternately adjacent at a small interval.
When the magnetic detection sheet comes in contact with the surface of the magnet to be
The exit sheet absorbs external light on each surface part of the N pole and the S pole,
At the boundary between the N pole and the S pole, external light is reflected and the N pole and the S pole are reflected.
In addition to identifying the boundary of the pole, the spherical magnet body
The direction of the N and S poles corresponds to the direction of the magnetic field lines on the magnet surface
To change the direction and determine the polarity in a narrow area of the magnet.
Can be different.

In the case where a display indicating the relationship between the identification display of the magnet body and the polarity is engraved on the bottom surface of the container body,
This display clearly appears when viewed from the front of the magnetic field line detector, is easy to see, and there is no fear that the display is rubbed and disappears, and correct polarity discrimination and magnetic field line detection can be performed without misidentifying the identification display.

[0011]

1 shows a magnetic field line detector according to the present invention. In FIG. 1, reference numeral 1 denotes a magnetic field line detector according to the present invention. Reference numeral 2 denotes a pair of a north pole 2a and a south pole 2b arranged in one axial direction. N pole 2a is red, S pole 2
b is a spherical magnet body having a diameter of about 2 mm coated in yellow, and a hole 3a having a diameter of about 2.5 mm is provided at the center of the bottom, and a convex lens part 3b is provided in front of the hole 3a.
m, a container body made of a synthetic resin material that can be seen from the outside, such as a disc-shaped acrylic having a height of about 7 mm, 4 a synthetic resin thin plate adhered to the bottom surface of the container body 3, and 5 It is a magnetic detection sheet adhered and formed. Incidentally, the synthetic resin thin plate 4 may be omitted, and the magnetic detection sheet 5 may be directly provided.

In this container 3, as shown in FIG. 3, the characters and symbols of "red → N" indicating that the red identification mark of the magnet 2 corresponds to the N pole are applied from the back thereof. 1mm
The sign 6 is formed by engraving with a depth of about a degree, and further coating a paint therein. It is to be noted that the display 6 can be formed by printing or the like, but engraving is more excellent in visibility.

The magnet body 2 is preferably a permanent magnet having a small diameter, a large remanence and a large coercive force, and is sealed together with a transparent liquid 7 in a hole 3a of the container body 3. If the clearance between the magnet body 2 and the hole 3a is small enough not to hinder the rotation of the magnet body 2 according to the magnetic field, the polarity of the magnet can be easily determined in a narrow area. Also liquid 7
It is preferable to use transparent oil or the like having a large specific gravity to give buoyancy to the magnet body 2 and having a somewhat high viscosity to attenuate and brake the fine movement of the magnet body 2.

As shown in FIG. 4, the magnetic detection sheet 5 includes a microcapsule 8 in which a plurality of micro magnetic scales such as iron and nickel and a dye are encapsulated in a substantially spherical gelatin capsule together with a liquid having high viscosity such as oil. A transparent protective film 10 is formed on the surface of a plurality of microcapsule layers 9 adhered to each other, and a light absorbing layer 11 of a dark color such as black is provided on the back surface. And the transparent protective film 1
No. 0 is attached to the back side of the container 3, and the magnetic detection sheet 5 is used with the magnetic detection sheet 5 facing the magnet side whose polarity is to be determined. Then, the micro magnetic scales in the microcapsule 8 change its direction according to the direction of the magnetic field lines of the magnetic field, and when the micro magnetic scales are directed in the vertical direction, light from above passes through the gaps of the micro magnetic scales and the light absorbing layer. 11, the magnetic detection sheet 5 looks black, and when the fine magnetic scales are directed in the horizontal direction, light from above is reflected by the fine magnetic scales, and the magnetic detection sheet 5 looks bright and dye-like.

The magnetic sensing sea lines of magnetic force detecting device 1 of the present invention having such a structure, the surface of the magnet to be determined polarity
When placed towards the door 5 side, for example, when the surface of the magnet is N pole, S pole 2b of the magnet 2 is rotated and moved are attracted to the N pole of the magnet to the lower magnetic force line detection device 1, red conversely N pole 2a
Is directed above the magnetic field line detector 1. The magnet body 2 is about 2 m in diameter
Although the diameter is small as m, the convex lens portion 3b formed on the surface of the container body 3 enlarges and displays the magnet body 2;
The color which is the identification display for determining the polarity can be easily determined. Then, the display 6 of “red → N” on the bottom surface of the container body 3 is confirmed, and when the magnet body 2 has the red N pole 2a facing up, the magnet surface has the N pole and the yellow S pole 2b faces up. When turned, the magnet surface is determined to be the south pole.

As shown in FIG. 2, the magnet whose polarity is to be distinguished has an N-pole 12a and an S-pole 12b alternately of 2 mm to 3 mm.
In the case of the magnets 12 magnetized at a fine interval of about mm, the magnetic detection sheet 5 displays the boundary between the N pole 12a and the S pole 12b of the magnet 12 as a line brighter than the other parts and a magnet. The body 2 determines that the polarity of the narrow portion is the N pole with its N pole 2a facing upward. Therefore, the magnetic detection sheet 5 detects the boundary of the polarity of the magnet whose polarity changes at a small interval, and the magnet body 2 detects the polarity of the magnet in each narrow region.

In the embodiment described above, the magnet 2
Is enclosed in the hole 3a together with the liquid 7, but the present invention is not limited to this, and only the magnet may be enclosed without the liquid.

In the magnetic field detector according to the present invention,
Due to its high sensitivity to a magnetic field, it is possible to indicate the direction of the line of magnetic force only by placing it in the magnetic field near the magnet as well as mounting it on the surface of the magnet.

[0019]

As described above in detail, according to the magnetic field line detector of the present invention, a spherical magnet body having a pair of N poles and S poles arranged in one axial direction and having identification and identification given by color and the like. Is rotatably housed in a container body that can be seen from the outside, and a convex lens body is attached and formed on the front surface of the magnet body housing portion of the container body .
And the convex lens body in the container body is attached.
On the opposite side, a transparent protective film and the film
Under the system, a plurality of fine magnetic scales and dye
Microcapsules enclosed in a substantially spherical membrane with the body
A microcapsule layer in which a number of
Magnetic sensing sheet consisting of a light absorbing layer
The magnets can be easily rotated even with a small magnetic field to change the direction of the magnetic poles, and the identification of small magnets is enlarged by the convex lens body for excellent visibility. The polarity of the magnetic field can be easily determined, and the direction of the magnetic field lines in the magnetic field can be confirmed from the directions of the N and S poles of the magnet body. Ma
In addition, the north pole and the south pole alternately
When the magnetic detection sheet abuts on the surface, the magnetic detection sheet
The surface portions of the N and S poles absorb external light, and
At the boundary between the south poles, external light is reflected and the boundary between the north and south poles is reflected.
In addition to identifying the minute, the spherical magnet body has its N pole,
Rotate the direction of the south pole according to the direction of the magnetic field lines on the magnet surface.
To change the direction and determine the polarity in a narrow area of the magnet
Can be.

In the case where a display indicating the relationship between the identification display of the magnet body and the polarity is engraved on the bottom of the container body,
This display clearly appears when viewed from the front of the magnetic field line detector, is easy to see, and there is no fear that the display is rubbed and disappears, and correct polarity discrimination and magnetic field line detection can be performed without misidentifying the identification display.

[Brief description of the drawings]

FIG. 1 is a perspective view of a half section of a magnetic field line detector according to the present invention.

FIG. 2 is a cross-sectional view illustrating a state of use of the magnetic flux detector according to the present invention.

FIG. 3 is a plan view of the magnetic field detector according to the present invention;

FIG. 4 is a cross-sectional view of the magnetic detection sheet used in the magnetic field line detecting device of the present invention.

FIG. 5 is a perspective view of a conventional magnetic field line detector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic field line detector 2 Magnet 2a N pole 2b S pole 3 Container 3a Hole 3b Convex lens 5 Magnetic detection sheet 6 Display

Claims (2)

(57) [Scope of request for utility model registration] 1. A pair of N-poles and S-poles arranged in one axial direction, and a spherical magnet body identified and identified by color or the like is rotatably housed in a container that can be seen from the outside. A convex lens body is attached and formed in front of the magnet body storage part in the container body
And attaching the convex lens body in the container body
On the surface opposite to the formed surface, a transparent protective film and the filter
Under the rum, a plurality of fine magnetic scales and dyes with high viscosity
Microcapsule enclosed in a substantially spherical membrane with liquid
Microcapsule layer with a large number of
Magnetic detection system consisting of a light absorbing layer laminated under the capsule layer
A magnetic field line detector, wherein a magnetic sheet is provided . 2. The magnetic field line detector according to claim 1, wherein a display indicating the relationship between the identification display of the magnet body and the polarity is engraved on the bottom surface of the container body.