JPH0548232Y2 - - Google Patents

Description

[Detailed description of the invention] [Summary] Concerning a two-sided display that displays characters, figures, symbols, etc. by reversing a rotating body with a display surface, the two-sided display does not produce impact noise at the stop position after rotation. For the purpose of providing a display device, it has two display surfaces,
It includes a rotating body that is reversibly supported on a central axis, two permanent magnets fixed to the rotating body, and a sub magnetic pole made of an electromagnet and a permanent magnet and arranged to face the magnetic pole of the permanent magnet. It includes a two-sided display characterized by:

[Industrial application field]

The present invention relates to a two-sided display that displays characters, figures, symbols, etc. by inverting a rotating body provided with a display surface.

[Conventional technology]

2. Description of the Related Art Conventionally, a two-sided display has been used to display characters, signs, etc. by arranging a large number of rotating bodies each having a reversible display surface in a dot matrix pattern.

FIGS. 4a and 4b are plan views of a conventional two-sided display. In these figures, 1 represents two display surfaces 2
a rotating body equipped with a and 2b; 3 a permanent magnet fixed to the rotating body 1; 4 and 5 two driving electromagnets arranged to face the magnetic poles of the permanent magnet 3;
Reference numeral 6 denotes a central axis for reversing the rotating body 1, and controls the energization of these electromagnets 4 and 5 to rotate the rotating body 1.
The rotating body 1 is rotated to a desired position by attraction and repulsion between the permanent magnet 3 attached to the permanent magnet 3 and the permanent magnet 3 attached to the rotating body 1. By arranging a large number of such rotating bodies 1 in a dot matrix, predetermined characters, figures, symbols, etc. can be displayed.

That is, as shown in FIG.
By making it a pole, the S pole of the permanent magnet 3 is attracted to the N pole of the electromagnet 4 on one side, and the N pole of the permanent magnet 3 is repelled, so that the display surface 2a on one side of the rotating body 1 is displayed. . In addition, as shown in Figure b, by reversing the direction of the current flowing to the electromagnets 4 and 5 from the state shown in Figure A, the direction of the magnetic poles changes, and the rotating body 1 is reversed by 90 degrees due to attraction and repulsion. , the display surface 2b is displayed.
At this time, in order to prevent the rotating body 1 from rotating too much, stoppers 7a and 7 that come into contact with the permanent magnet 3, etc.
b is provided.

[Problems to be solved by the invention] In the conventional two-sided display, two driving electromagnets 4 and 5 are used to convert the display state, which increases the cost and prevents the rotating body 1 from rotating too much. Stoppers 7a and 7b are provided to prevent erroneous display due to the rotation, and there is a problem in that an impact sound is generated when the permanent magnet 3 or the like collides with the stoppers 7a and 7b at the stop position after rotation. In addition, in conventional two-sided displays,
The cores of the electromagnets 4 and 5 are made of soft magnetic material (such as pure iron rods) and become magnets only when energized. Therefore, in order to perform stable display conversion, it is necessary to energize for a relatively long time until the conversion is completed. It had to retain its magnetic force. Furthermore, even in the display state, when external forces such as wind or rain are applied, the display state may change due to these external forces.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a two-sided display that produces no impact noise at the stopped position after rotation.

[Means to solve problems]

In order to achieve the above object, the two-sided display of the present invention has two display surfaces, a rotating body that is reversibly supported on a central axis, and a two-sided display that is fixed to the rotating body.
The magnet includes a permanent magnet, and a sub-pole made up of an electromagnet and a permanent magnet and arranged to face the magnetic pole of the permanent magnet.

Further, in the above configuration, the core of the electromagnet can also be formed of a semi-hard magnetic material.

[Effect]

In the present invention, the number of electromagnets can be reduced compared to the conventional method by arranging a sub-pole consisting of a driving electromagnet and a permanent magnet so as to face two permanent magnets fixed to a rotating body. Furthermore, since no stopper is provided, no impact noise is generated at the stop position after rotation.

Furthermore, if the core of the electromagnet is made of semi-hard magnetic material, just by energizing the core for the short time required to magnetize it, it will remain magnetized even when it is not energized, allowing display conversion and high-speed control. Become.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to an illustrated embodiment.

FIG. 1 is a perspective view showing the structure of a two-sided display according to an embodiment of the present invention.

In the same figure, the two-sided display device includes a rotating body 11 and two display surfaces 12a and 12 that constitute this rotating body 11.
2b, two permanent magnets 1 fixed to the rotating body 11
3a, 13b, one electromagnet 14 for driving, one sub-magnetic pole 15, a central shaft 16, etc., and the rotating body 11 has two display surfaces 12a, 1
2b are formed adjacent to each other and perpendicular to each other, and are supported to rotate around the central axis 16. The permanent magnets 13a and 13b are connected to the rotating body 11.
It is fixed in parallel to a mounting plate 17 or the like formed in the central axis 16 with the central axis 16 in between. Further, the electromagnet 14 and the sub-magnetic pole 15 are formed into rod shapes, and are arranged such that their ends face the magnetic poles of the permanent magnets 13a and 13b, respectively. In this example, the auxiliary magnetic pole is a permanent magnet whose south pole is on the side facing the permanent magnet fixed to the rotating body.

Next, the operation of the two-panel display having the above configuration will be explained.

FIGS. 2a and 2b are explanatory diagrams of the operation of the two-sided display according to the embodiment of the present invention.

As shown in FIG.
The S pole of the permanent magnet 13a is attracted to the S pole of the auxiliary magnetic pole 15, and the N pole of the permanent magnet 13a is attracted to the S pole of the auxiliary magnetic pole 15.
1 is displayed on one display surface 12a.

Next, as shown in FIG. 2B, in the display state shown in FIG. This permanent magnet 1
The N pole of 3b is attracted, and this permanent magnet 13
The north pole of b is attracted to the south pole of the sub magnetic pole 15, the rotating body 11 is reversed (clockwise in FIG. 2b), and the display surface 12b on the other side is displayed.

In the two-sided display with the above configuration, one electromagnet 14 is provided for driving, and the auxiliary magnetic pole 15 made of one permanent magnet is provided, so all that is required is to change the direction in which the current flows through one electromagnet 14. You can convert the display using . Therefore, the number of electromagnets can be reduced by one compared to the conventional example, and by adding one permanent magnet and the sub-pole 15 consisting of one permanent magnet, the cost can be reduced compared to the conventional example using two electromagnets. Can be lowered. Furthermore, since no stopper is provided to prevent erroneous display due to excessive rotation of the rotating body 11, no impact noise is generated at the stop position after rotation.

Further, in another embodiment, a semi-hard magnetic material is used for the core of the electromagnet 14 in the two-sided display of the above embodiment. By using a semi-hard magnetic material for the core, just by energizing the core for the short time required to magnetize it, the magnetization is maintained even when the power is not energized, allowing display conversion and high-speed control. . Further, even if the display surfaces 12a, 12b are changed due to external force such as wind or rain, the display can be returned to its original correct state because the magnetic force is maintained.

In addition, in the present invention, the rotating body 11 only needs to be provided with two display surfaces 12a and 12b and supported on the central axis 16 in a freely reversible manner, and its shape is not limited to that of the embodiment.

Further, the sub magnetic pole 15 consisting of the electromagnet 14 and the permanent magnet is connected to the permanent magnet 13 fixed to the rotating body 11.
It is only necessary to arrange it facing to a and 13b.

The permanent magnets 13a and 13b may be magnetized in the thickness direction, and a specific example thereof is shown in the perspective view of FIG. 3, in which the same parts as shown in FIG. Displayed with the same code.

[Effects of the invention] As explained above, according to the invention, in a two-sided display, a sub-pole consisting of a driving electromagnet and a permanent magnet is arranged facing two permanent magnets fixed to a rotating body. This allows the number of electromagnets to be reduced compared to conventional methods. Furthermore, since no stopper is provided, no impact noise is generated at the stop position after rotation.

Furthermore, if the core of the electromagnet is made of a semi-hard magnetic material, just by energizing the core for the short time required to magnetize it, it will remain magnetized even when it is not energized, allowing display conversion and high-speed control.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration of a two-sided display according to an embodiment of the present invention, FIGS. The perspective view of the embodiment and FIGS. 4a and 4b are plan views of a conventional two-sided display. In the figure, 11 is a rotating body, 12a, 12b are display surfaces, 13a, 13b are permanent magnets, 14 is an electromagnet,
15 is a sub magnetic pole, 16 is a central axis, and 17 is a mounting plate.

Claims (1)

[Claims for Utility Model Registration] (1) A rotating body 11 having two display surfaces 12a and 12b and reversibly supported on a central shaft 16, and two permanent magnets 13 fixed to the rotating body 11.
A, 13b, and a sub-pole 15 consisting of an electromagnet 14 and a permanent magnet, which are arranged to face the magnetic poles of the permanent magnets 13a, 13b. (2) The two-sided display according to claim 1, wherein the core of the electromagnet 14 is made of a semi-hard magnetic material.