JPH06111696A - Reed switch opening/closing device - Google Patents

Abstract

PURPOSE:To optionally select the operating time of a reed switch and expand the utilization range of the reed switch by forming a permanent magnet with a main magnet and an auxiliary magnet in combination, and displacing the magnetic pole centers of the magnets. CONSTITUTION:A permanent magnet 14 opening or closing a reed switch 11 is constituted of a two-pole ring main magnet 15 and an auxiliary magnet 16 having the same shape arranged in contact or nearby in the axial direction. The magnetic pole center (N1-S1) of the main magnet 15 is displaced from the magnetic pole center (N2-S2) of the auxiliary magnet 16, and both magnets 15, 16 are integrally combined. The auxiliary effective magnetic flux angle theta2 is added to the effective magnetic flux angle theta1 of the main magnet 15 to form the new effective magnetic flux angle theta3. When the magnetic field is applied to the reed switch 11 by the magnet 14, i.e., when the contact section of the reed switch 11 enters the effective magnetic flux angle theta3, the reed switch 11 can be turned on. When the contact section goes out of the effective magnetic flux angle theta3, the reed switch 11 is turned off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reed switch opening / closing device which uses a magnet having an auxiliary pole.

[0002]

2. Description of the Related Art A reed switch opening / closing device 1 includes a reed switch 5 and a permanent magnet 4 arranged in parallel with the reed switch 5. The reed switch 5 has two ferromagnetic reed pieces 2 and 2 as shown in FIG. It has a structure in which the tips of the ′ 's are opposed to each other and are inserted into a glass tube filled with an inert gas. As the permanent magnet 4,
A bar magnet, a two-pole ring magnet as shown in the figure, or a multi-pole ring magnet such as four poles is used.

In operation of the reed switch 5, the magnetic field of the permanent magnet 4 induces an N pole and an S pole in the lead pieces 2, 2 ', and the magnetic attraction force causes the tips of the lead pieces 2, 2'to come into contact with each other. By removing the magnetic field, the elasticity of the lead pieces 2, 2'releases the contact of the tips of the lead pieces 2, 2 '.
That is, when the permanent magnet 4 rotates and the contact portion of the reed switch 5 enters within the effective magnetic flux angle θ ₁ of the magnet 4 shown in FIGS. When the lead pieces 2 and 2 ′ are closed (turned on) and positioned outside the effective magnetic flux angle θ ₁ , the tips of the lead pieces 2 and 2 ′ are opened, and the electric circuit is opened (off).

[0004]

When the reed switch 5 is opened and closed by the rotational movement of the permanent magnet 4, the effective magnetic flux angle 1 is constant, so the magnet strength, the sensitivity of the reed piece, the distance between the reed piece and the permanent magnet, etc. Reed switch 5 depending on
The impression value and opening value of are determined. Therefore, generally, when a small-diameter magnet is used, the operating time thereof becomes short. However, depending on the usage conditions, it is desired to improve the impression value and the open value in order to increase the operation time for turning the reed switch 5 on and off. Therefore, it is an object of the present invention to provide a reed switch device that can meet the above-mentioned requirements.

[0005]

In order to solve the above-mentioned problems, the present invention combines a main magnet with an auxiliary magnet and shifts the auxiliary magnetic pole center of the auxiliary magnet from the main magnetic pole center of the main magnet. Is basically adopted.

Specifically, according to the present invention, the tip of a reed switch made of a magnetic material is brought into contact with the reed switch having the tips opposed to each other by the rotational movement of a permanent magnet arranged in parallel with the reed switch.
In the reed switch opening and closing device to be in non-contact state,
Provided is a reed switch opening / closing device characterized in that a permanent magnet is composed of a combination of a main magnet and an auxiliary magnet, and magnetic pole centers of the respective magnets are arranged so as to be displaced from each other.

[0007]

[Function] The effective magnetic flux angle θ ₁ of the main magnet is added to the effective magnetic flux angle θ ₃ of the auxiliary magnet to obtain a new effective magnetic flux angle θ ₂ . Adjusting this new effective magnetic flux angle θ ₂ ,
The open value can be selected.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIGS. Reed switch 11
Is arranged such that the tips of the two lead pieces 12 and 12 'made of ferromagnetic material are opposed to each other, the tips are arranged in parallel in a glass tube 13 in which an inert gas is sealed, and the glass tube 13 is rotated. The permanent magnet 14 is arranged.

The permanent magnet 14 is composed of a main magnet 15 which is a two-pole ring magnet arranged in contact with or close to the axial direction, and an auxiliary magnet 16 having the same shape. Magnetic pole center of the main magnet 15 (N ₁ −
S ₁ ) is offset from the magnetic pole center (N ₂ −S ₂ ) of the auxiliary magnet, and both magnets 15 and 16 are integrally combined by adhesion or the like.
Further, the magnet 16 may be magnetized so that only one magnetic body is provided so that the main pole and the auxiliary pole are displaced from each other.

With this configuration, the auxiliary effective magnetic flux angle (θ ₃ ) is added to the effective magnetic flux angle (θ ₁ ) of the main magnet 15 to create a new effective magnetic flux angle (θ ₃ ). When the magnetic field from the magnet 14 acts on the reed switch 11, that is, when the contact portion of the reed switch 11 enters the effective magnetic flux angle (θ ₃ ), the reed switch 11 is turned on. This effective magnetic flux angle (θ ₃ ) When the contact portion comes out, the reed switch 11 is turned off. The permanent magnet is not limited to the ring shape. The new effective magnetic flux angle (θ ₃ ) is selected according to the combination of both magnets 15 and 16, that is, the degree of offset in the angular direction of the magnetic pole center,
Obtain the required impression and opening values. In the above, 2
Although the pole magnet 14 has been described, a magnet having four poles or other multipoles may be used. Further, the main magnet and the auxiliary magnet are not necessarily limited to the same shape.

[0011]

According to the present invention, the operating time of the reed switch can be arbitrarily selected by adjusting the shift angle between the magnetic pole centers of the main magnet and the auxiliary magnet, so that the range of use of the reed switch can be expanded. In particular, since a required operation time can be obtained even with a small-diameter magnet, it can be incorporated in a small-sized device such as a small motor.

[Brief description of drawings]

FIG. 1 is a plan view of an example of the present invention.

FIG. 2 is a side view of a permanent magnet.

FIG. 3 is an explanatory diagram of a conventional example.

FIG. 4 shows that the reed switch is turned on with the rotation of the permanent magnet.
It is a figure explaining an off state.

[Explanation of symbols]

 11 Reed switch 12, 12 'Reed piece 13 Glass tube 14 Permanent magnet 15 Main magnet 16 Auxiliary magnet

Claims (1)

[Claims] 1. A reed switch opening / closing device for bringing a tip of a magnetic reed piece into contact / non-contact with a reed switch having the tips facing each other by rotational movement of a permanent magnet arranged in parallel to the reed switch. A reed switch opening / closing device, wherein a permanent magnet is composed of a combination of a main magnet and an auxiliary magnet, and magnetic pole centers of the respective magnets are arranged so as to be displaced from each other.