JPH0644444B2 - Self-holding switch mechanism - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-holding switch mechanism composed of a semi-hard magnet whose magnetic pole is easily reversed by a current magnetic field and a thin plate-shaped rolled magnet.

2. Description of the Related Art As a typical conventional self-holding switch mechanism, as shown in FIG. 3, two leads 1 made of a Ni--Fe alloy,
It is known that the two are opposed to each other as shown in the figure, the coil 3 is provided on the outer periphery thereof, and the leads 1 and 2 are closed by energizing the coil 3, and the circuit is closed according to this mechanism. During the period it was necessary to always supply current to the coil.

The switch mechanism shown in FIG. 4 has the leads 4 and 5 formed of thin plates of permanent magnets.
The circuit is closed by the adsorption force of. The way to open this circuit is
A permanent magnet magnetized so that a magnetic field acts on the leads 4 and 5 from the outside is brought close to and held in that state, or as described in FIG. 3, a coil is attached to the outer circumference of the leads 4 and 5. There is a method of opening a circuit by providing a magnetic field generated by the coil.

Problems to be Solved by the Invention As described above, in the conventional switch mechanism, when switching the circuit in the normal state, it is necessary to continue supplying the current to the coil 3 or to keep the permanent magnet close to the coil 3 and hold the circuit. It has a drawback that opening and closing becomes complicated.

It is an object of the present invention to provide a self-holding switch mechanism which can remedy the above-mentioned drawbacks of the prior art and can easily open and close circuits.

Means for Solving the Problems The self-holding type switch mechanism of the present invention is composed of a semi-hard magnet whose magnetic poles are easily reversed in a current magnetic field and a thin plate-shaped rolled magnet capable of plastic working. The circuit is closed (or opened) by the attractive force (or repulsive force).

However, the magnetic poles of semi-hard magnets, which are a part of the leads, are easily reversed by the current magnetic field. Therefore, the magnetic poles are reversed by passing a pulsed current through the coil, and the reeds of the two magnets are repulsive (or attractive) to the leads. Will open (or close) the circuit.

Since the semi-hard magnet, which is a part of the lead, is essentially a permanent magnet even after the magnetic poles are reversed, the lead portion can keep its state.

The magnetic characteristics (Br and Hc) of a semi-hard magnet utilizing the reversal of magnetic poles are such that the attraction force (or repulsive force) that acts between the thin plate-shaped rolled magnet and the semi-hard magnet even after the magnetic poles are reversed under the current magnetic field. ), It is necessary to open and close the circuit, so that at least Br must be 6 KG or more,
Hc is preferably 50 to 300 Oe.

Considering the necessity of reliably reversing the magnetic poles with an appropriate gap (distance between semi-hard magnet and rolling magnet), Br is 12 KG.
As described above, Hc is more preferably 50 to 100 Oe. As one having such magnetic properties, for example, Japanese Patent Application No. 59-978.
Magnetic alloys as described in the specification of JP-A No. 63-243251 can be effectively used in the present invention.

Further, as the thin plate-shaped rolled magnet, for example, Japanese Patent Publication No. Sho 49-20541.
Nos. 51-28959, 53-35536 and 55-37588 can be effectively used in the present invention.

Hereinafter, the details of the present invention will be described with reference to the drawings.

Embodiment 1 FIGS. 1 (a) and 1 (b) are views showing an embodiment of a switch mechanism according to the present invention.

In FIG. 1 (a), the thin plate-shaped rolled magnet lead 7 is surface-magnetized so that the upper magnetic pole and the lower magnetic pole of the attracting portion with the semi-hard magnet lead 8 are S poles, and the semi-hard magnet 8 is Since the rolling magnet side has the N pole, the circuit is in a closed state.

FIG. 1 (b) shows a switch mechanism when a pulse current is applied to the coil 9 so that the lead 7 side of the semi-hard magnet lead 8 becomes the S pole.
The opposing part receives a repulsive force and the circuit opens. In this state, this state can be maintained unless a reverse pulse current of the coil is passed.

Embodiment 2 FIGS. 2A and 2B are views showing another embodiment of the switch mechanism according to the present invention.

This example is a switch mechanism in which two thin plate-shaped rolled magnet leads 7 are opened, and the leads 7a and 7b are surface-magnetized as in the first embodiment.

In FIG. 2 (a), the semi-hard magnet lead 8 is the lead a,
Since the b side is the N pole, the lead 7a is attracted and the circuit is closed, but the lead 7b is in the open state because it receives the repulsive force. Next, as shown in FIG. 2 (b), a pulse current is applied to the coil 9 from the lead 7 side of the semi-hard magnet lead 8 so that the lead 9a is reversed. The circuit receiving the force is opened, and the lead 7a receives the attraction force and the circuit is closed.

When a reverse pulse current is applied to the coil 9 in this state, the magnetic poles of the semi-hard magnet are reversed again, and FIG.
Return to the state of. In this state, the switching mechanism can keep this state as long as the reverse pulse current is not applied.

As described above, according to the present invention, the semi-hard magnet and the thin plate-shaped rolled magnet are used for the lead portion, the magnetic pole of the semi-hard magnet which is a part of the lead portion is reversed by the current magnetic field, and the attraction force of both is applied. (Or repulsive force) can open and close the circuit.

[Brief description of drawings]

1 and 2 are schematic views showing one embodiment and another embodiment of a self-holding type switch mechanism according to the present invention, and FIGS. 3 and 4 are schematic views showing a conventional switch mechanism. is there. 1, 2: Alloy lead, 3; Coil, 4, 5; Magnet alloy lead, 6; Permanent magnet, 7; Thin plate rolled magnet, 8; Semi-hard magnet, 9; Coil

Claims (2)

[Claims] 1. A movable lead portion, which comprises a thin plate-shaped rolled magnet that can be plastically worked, and has a pair of magnetic poles having mutually different polarities at its movable end portion, and a movable lead portion facing the movable end portion of the movable lead portion. A fixed lead portion having a pair of magnetic poles having different polarities, the fixed lead portion being arranged and made of a semi-hard magnet having a residual magnetic flux density (Br) of 6 KG or more and a coercive force (Hc) in the range of 50 to 300 Oe. A self-holding switch mechanism having a coil wound around a portion, and a pulse current is passed through the coil so that the magnetic pole of the fixed lead is inverted by the current magnetic field. 2. A semi-hard magnet and F as a thin plate rolled magnet.
The self-holding switch mechanism according to claim 1, wherein a magnet alloy containing e, Cr, and Co as a main component is used.