JPH05296788A - Eight-pole magnetized ball and manufacture thereof - Google Patents

Abstract

PURPOSE:To improve the detecting accuracy of displacement in a month an a planimeter or the like. CONSTITUTION:The surface of a magnetic ball 1' is divided into eight sections of a solid triangle at a solid angle of 90 deg. with two points in the diametral direction as the center, and each of eight poles 2A, 2B, 3A, 3B, 4A, 4B, 5A and 5B, where a magnetic field of N pole or S pole is generated, is made contact with respective sections under pressure. The magnetic field of N or S pole is generated so as to each section comes to polarity different from an adjacent section, through which each section is magnetized to the N or S pole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mouse used for position input of a computer, an octupole magnetized ball most suitable for a planimeter for measuring a length on a drawing, and a manufacturing method thereof.

[0002]

2. Description of the Related Art For example, a mouse, which is widely used for inputting a position of a computer, is operated by moving it on a surface as is well known. A rotatable small diameter roller pressed against the ball. Then, when the ball is rotated while being pressed against the paper surface or the desk surface, the roller engaged with the ball also rotates, and the displacement amount is detected by the rotation of the roller.

[0003]

However, in a detection mechanism such as a mouse, the ball is pressed against the surface and the roller is pressed against the ball. Therefore, the ball and the roller do not always rotate with the movement of the mouse. Sometimes it slips without rotating. Therefore, there is a high possibility that the rotation unevenness of the ball and the rotation unevenness of the roller will occur, and the displacement amount cannot be accurately detected.

Therefore, an object of the present invention is to improve the accuracy of detecting the displacement amount.

[0005]

The above-mentioned object is to achieve the object of the present invention.
Achieved by polar magnetized balls. That is, the surface of the magnetic ball is divided into eight sections of a solid triangle having a solid angle of 90 ° about two points in the diametrical direction, and each section has a magnetic property (N pole or S pole) different from that of the adjacent section. It is magnetized to the pole.

In this 8-pole magnetized ball, the spherical surface is equally divided into 8 sections, and each section is magnetized to the N pole or S pole.
The boundary of the compartment and its vicinity are magnetically neutral. Therefore, when this ball is pressed against a surface and rotated in all directions, such as front, back, left, and right, the magnetic pole changes according to the number of rotations (corresponding to the distance moved on the surface). By using one point as a reference and detecting the number of changes in the magnetic pole at the reference point, the moving distance of the ball can be calculated. According to the displacement amount detection using the ball, the rotation unevenness that deteriorates the detection accuracy is caused only by the ball, and the mechanism for detecting the change in the magnetic pole is not in contact with the ball, and the displacement amount detection accuracy is high. Get higher

Regarding the production of the above-mentioned eight-pole magnetized ball, it is generally considered that there are only two poles of N pole and S pole in the permanent magnet, but if a special magnetizing method, that is, the manufacturing method of the present invention is used. It is possible to realize octupole magnetization for one magnetic body. The manufacturing method is such that the surface of the magnetic ball is divided into eight sections of a solid triangle having a solid angle of 90 ° centering on two points in the diametrical direction, and each section is provided with a pole that generates a magnetic field of N pole or S pole. It is characterized in that the magnetic fields of N poles or S poles are generated from the respective poles so as to have a magnetic pole property different from that of the adjacent compartments by press contacting, and each section is magnetized to the N pole or the S pole. is there.

In the present invention, the magnetic balls may be those capable of magnetizing at least the surface, and steel balls are exemplified. Further, the ball may be a ball having a clogged inside or a ball, and the size thereof may be appropriately selected according to the application.

[0009]

EXAMPLES The octupole magnetized balls of the present invention and the method for producing the same will now be described with reference to Examples. 1A is a perspective view of a ball according to the embodiment, FIG. 1A is an upper hemisphere view of the ball shown in FIG. 1A, and FIG. 1C is a lower hemisphere view of the ball shown in FIG.
Shown in. As can be seen from FIG. 1, this 8-pole magnetized ball 1
Is, for example, a steel ball, and the spherical surface is equally divided into eight sections (parts sectioned by dotted lines) of a three-dimensional triangle having a solid angle of 90 ° around two points in the diameter direction, and each section is different from the adjacent section. Each section is magnetized to the N pole or the S pole so as to have the magnetic pole property. For convenience, the upper hemisphere of the ball is 1a and the lower hemisphere is 1
b, in the upper hemisphere 1a and the lower hemisphere 1b,
From (b) and (c), the north pole and the south pole are located at point symmetry positions, and the upper and lower hemispheres have different magnetic poles. With such a magnetic pole arrangement, every section has a different polarity from the three adjacent sections.

Next, a method of manufacturing the ball will be described. An example of the magnetizing jig used for the manufacture is shown in FIG.
This jig includes a yoke 2C having a pair of poles (N pole and S pole) 2A and 2B, and a magnetizing coil 2 wound around the yoke 2C.
D and. Both poles 2A and 2B have a function of sandwiching a magnetic substance ball (steel ball or the like) 1'to be magnetized in the diametrical direction, and the end faces are concavely curved corresponding to the spherical surface of the ball in order to ensure secure sandwiching. It is a face. Further, a fine adjustment mechanism (not shown) such as a screw is provided on the yoke 2C so that one pole 2A can be finely moved in the arrow direction and fixed at an arbitrary position. Since the pole 2A can be moved, it is possible to handle balls having different diameters.

Then, further three sets of similar magnetizing jigs are prepared. Each magnetizing jig has a pair of poles 3A: 3B, 4A: 4B,
5A: Yokes 3C, 4C, 5C having 5B and magnetizing coils 3D, 4D, 5D are provided, respectively. A magnetizing circuit having magnetizing coils 2D, 3D, 4D and 5D of these four sets of magnetizing jigs is shown in FIG. In this circuit, the magnetizing coils 2D, 3D, 4D, 5D connected in series and the AC power source 100V are connected via an insulating transformer Tr, and the capacitor C is connected in parallel to the transformer Tr via a switch SW.
A diode D for rectifying and a resistor R for protecting the diode D are provided.

Therefore, FIG. 4 [for convenience (a) is a top view,
(B) is a front view and (c) is a side view], the pair of poles 2A: 2B, 3A: 3B, 4 of each magnetizing jig.
A: 4B, 5A: 5B hold each section on the surface of the ball 1 '. As described above, each section is a solid triangle with a solid angle of 90 ° centered on two points in the diametrical direction, and the position sandwiched with respect to each section is the center point (approximately the center of gravity) of the solid triangle. Two sections on a diametrical line passing through the center point are sandwiched oppositely by both poles of a pair of magnetizing jigs (see FIG. 2).
At this time, both poles of each magnetization jig are magnetic poles as shown in FIG. 4, that is, magnetic fields having different magnetic polarities are applied to the adjacent sections. In the example shown in FIG. 4, a pair of poles 2
A and 2B are the north and south poles, respectively, and the same poles 3A and 3B
To S pole and N pole, and poles 4A and 4B to N pole and S pole, and pole 5
A and 5B are set to S pole and N pole.

When the switch SW is connected to the diode D side while the ball 1'is sandwiched by four sets of magnetizing jigs, A
100V of the C power source is transformed by the transformer Tr, and a secondary voltage is output from the transformer Tr. This secondary voltage is converted into a DC voltage by the diode D, and this DC voltage is charged in the capacitor C. Next, when the switch SW is connected to the magnetizing coil side, the electric charge accumulated in the capacitor C becomes a momentary large current and is discharged to the magnetizing coil. Then, the yoke 2 of each magnetizing coil 2D, 3D, 4D, 5D
8 poles 2A, 2B, 3 through C, 3C, 4C, 5C
A strong magnetic field of magnetic poles as shown in FIG. 4 is generated from A, 3B, 4A, 4B, 5A, and 5B, and the entire surface of the ball 1'is magnetized at one time by the magnetic polarities of the poles pressed against each section. It

[0014]

As described above, in the 8-pole magnetized ball of the present invention, the surface of the magnetic ball is equally divided into 8 sections, and each section has a different magnetic pole characteristic (N pole or S pole) from the adjacent section. By applying this ball to a mouse or a planimeter, it is possible to obtain a detection mechanism with less rotation unevenness that is a main cause of displacement amount error, and the displacement amount detection accuracy is improved. Further, by using the manufacturing method of the present invention, the octupole-magnetized ball can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a perspective view, an upper hemisphere view, and a lower hemisphere view of an octupole magnetized ball according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a magnetization jig used in the manufacturing method of the present invention.

FIG. 3 is a magnetizing circuit diagram using four pairs of magnetizing jigs shown in FIG.

FIG. 4 is a top view, a front view, and a side view showing a state when magnetizing each section on the surface of a magnetic ball using four sets of magnetizing jigs.

[Explanation of symbols]

 1 8 pole magnetized ball 1'magnetic material ball 2A, 2B, 3A, 3B pole 4A, 4B, 5A, 5B pole 2C, 3C, 4C, 5C yoke iron 2D, 3D, 4D, 5D magnetized coil

Claims (2)

[Claims] 1. The surface of a magnetic ball is divided into eight sections of a solid triangle having a solid angle of 90 ° centering on two points in the diametrical direction, and each section has a magnetic pole characteristic (N pole or S pole) different from that of an adjacent section.
An eight-pole magnetized ball characterized by being magnetized to a pole. 2. The surface of a magnetic ball is divided into eight sections of a solid triangle having a solid angle of 90 ° centered on two points in the diameter direction,
A pole that generates an N-pole or S-pole magnetic field is pressure-contacted to each of these sections, and an N-pole or S-pole magnetic field is generated from each pole so that each section has a magnetic polarity different from that of an adjacent section, and each section Is magnetized to the N pole or the S pole.