JP7199406B2 - Reed switch control device and push button switch provided with the same - Google Patents

Description

The present invention relates to a reed switch control device for controlling ON/OFF driving of a reed switch, and a push button switch provided with this reed switch control device.

In trains and diesel trains on routes with few passengers, the doors are left open for an unnecessarily long time while the train is stopped at a station. In order to prevent the temperature inside the car from rising due to this, there are some that are equipped with semi-automatic doors that can be opened and closed by the passengers themselves.

In the vehicle as described above, push-button switches are installed as switches for opening and closing the doors on the vehicle outer side and the vehicle inner side of the door accommodating portion, respectively.

A conventional push button switch of this type is shown in FIG. In FIG. 6, x, y, and z indicate x, y, and z axes in a three-dimensional orthogonal coordinate system. This three-dimensional orthogonal coordinate system is common to each figure.

The push button switch shown in FIG. 6 includes a reed switch 2 fixedly provided in a casing (not shown) and a push button 3 provided so as to be retractable with respect to the casing. A magnet 4 for driving the reed switch 2 is attached to the surface on the switch 2 side. In this push button switch, the reed switch 2 constitutes its contact portion.

In this push button switch, when the push button 3 is operated, one of the opposing electrodes of the reed switch 2 is magnetized by the magnet 4, and magnetic attraction force generated between the electrodes of the reed switch 2 magnetizes the opposing electrodes. The ON/OFF control of the reed switch 2 is made as conduction/non-conduction.

In the push button switch of FIG. 6, the direction of the magnetic pole axis of the magnet 4 is set in the y direction perpendicular to the x direction (also the length direction) of the electrode axis of the reed switch 2. One of the north or south poles of the shaft faces the reed switch 2 side.

The push button switch having the above configuration can be used at a relatively high voltage because the contact portion thereof is the reed switch 2 as described above. Since the switch 2 is positioned on the side of the displacement path in the operation direction indicated by the arrow of the push button 3, the overall thickness is reduced to the depth length of the push button 3 plus its displacement stroke, and the thickness can be reduced. and other advantages.

Nippon Hamlin Co., Ltd. "Knowledge of reed switches" Gensha 1980 Japanese Patent Application Laid-Open No. 2001-184973

As described above, when the reed switch control device is composed of the reed switch 2 and the magnet 4, there is room for improvement in the action of the magnet 4 on the reed switch 2. It is desired to further shorten the movement stroke of the push button 3 and make it thinner without impairing the

The operation and problems of the conventional reed switch control devices (1) and (2) will be described below.

The layout of the reed switch 2 and the magnet 4 in the conventional reed switch control device (1) is shown in FIGS. 7(a) and 7(b). FIG. 7(a) is a plan view, and FIG. 7(b) is a side view. In these figures, the electrode axis direction of the reed switch 2 is set in the x direction, the magnetic pole direction of the magnet 4 is set in the y direction, and the magnet 4 moves in the z direction. In FIG. 7(a), the z-axis is an axial direction that vertically penetrates the paper surface, and in FIG. 7(b), the x-axis is an axial direction that vertically penetrates the paper surface.

When the push button 3 is pressed and the magnet 4 moves from the position indicated by the dashed line 4' to the position z=0 indicated by the solid line as shown in FIG. Therefore, the magnetizing force is maximum and the reed switch 2 is on.

As the position of the magnet 4 increases or decreases from the position of z=0, the magnetizing force on the reed switch 2 gradually decreases, and the reed switch 2 is turned off at a farther position.

When the magnet 4 moves toward the position z=0 on the z-axis, the reed switch 2 is turned on at the position where the magnetizing force becomes equal to or greater than the on-magnetizing force.

In this manner, in the method in which the magnetic pole direction of the magnet 4 is in the y direction and the magnet 4 moves in the z direction, since the change in magnetizing force is gradual, the movement distance of the magnet 4 for turning on/off the reed switch 2 is becomes longer. Therefore, in this reed switch control device, the operation stroke of the push button 3 is long, and there is a limit to how thin the push button switch can be made.
As another control method, the operation of the reed switch control device (2) will be described according to Non-Patent Document 1 with reference to FIG.

In this reed switch control method (2), the magnetic pole direction of the magnet 4 (M) is the y direction, and the magnet 4 can move in the y direction at a certain position in the x direction.

In FIG. 8, ON is the ON boundary line, and the area inside the ON boundary line ON is the ON area where the reed switch 2 is turned ON. A reed switch 2 whose electrode axis is arranged in the x direction is on when the magnet 4 is in the on region.

In FIG. 8, OFF is an off boundary line, and the area outside this off boundary line OFF is an off area where the reed switch 2 is turned off. Reed switch 2 is off when magnet 4 is in the off region.

A hysteresis region exists between the two boundary lines ON and OFF, and when the magnet 4 is in the hysteresis region, the reed switch 2 maintains the ON/OFF state before the magnet 4 enters the hysteresis region.

In the method using the reed switch control device (2), the width of the hysteresis region between the ON boundary line ON and the OFF boundary line OFF is relatively wide in the y direction.

If the width of the hysteresis region is wide, the magnet 4 must pass through the wide hysteresis region in order to turn the reed switch 2 on and off, assuming that the direction of movement of the magnet 4 accompanying the operation of the push button is the y direction. Since it is necessary to operate the push button in this manner, the operation stroke of the push button in the operating direction becomes large, making it difficult to reduce the thickness of the push button switch.

A main object of the present invention is to provide a reed switch control device provided in a push button switch, in which the operation stroke of the push button provided in the push button switch can be shortened and the thickness of the push button switch can be reduced. and to provide a push button switch equipped with this.

(1) In order to achieve the above object, the reed switch control device according to the present invention includes:
In a reed switch control device that controls on/off of a reed switch,
a bias magnet magnetized in a direction orthogonal to the electrode axis direction on a plane including the electrode axis of the reed switch;
a drive magnet magnetized in a direction orthogonal to the electrode axis direction of the reed switch;
with
the bias magnet is fixed in or near a hysteresis region between an on region where the reed switch is turned on by its magnetic force and an off region where the reed switch is turned off;
The driving magnet is
When the driving magnet moves in one of the magnetization directions through the vicinity of the reed switch, one magnetic pole of the N magnetic pole or the S magnetic pole approaches one electrode of the reed switch and pushes the one electrode. magnetizing and driving the reed switch on to assist the on action by the bias magnet; and
When the driving magnet moves in the other magnetization direction through the vicinity of the reed switch, the other magnetic pole of the N magnetic pole or the S magnetic pole approaches the one electrode of the reed switch and pushes the one electrode. It is characterized in that it is magnetized and prevents the ON operation by the bias magnet to drive the reed switch OFF.

According to the present invention, when the drive magnet is moved in one of its magnetization directions to assist the magnetization of the bias magnet to strengthen the magnetization, the bias magnet itself is fixed and fixed in or near the hysteresis region. Also, it is as if the bias magnet has entered the ON region, thereby driving the reed switch to ON. Further, when the drive magnet is moved in the other magnetization direction to weaken the magnetization of the bias magnet, even if the bias magnet itself is fixed in or near the hysteresis region, the bias magnet is turned off as if it were turned off. As if entering the region, the reed switch can be driven off.

Therefore, according to the present invention, the magnetic force of the drive magnet can control the ON/OFF operation of the reed switch by assisting the magnetization force of the bias magnet or resisting the magnetization force of the bias magnet. is a small magnet with a small magnetic force, and it is possible to shorten the length in the magnetization direction, thereby shortening the moving distance of the driving magnet, and accordingly the push button for moving the driving magnet. A short operation stroke is sufficient, and this makes it possible to reduce the thickness of the push button switch provided with the reed switch control device.

Further, according to the present invention, the bias magnet is fixed, and the drive magnet assists or weakens the magnetization of the bias magnet, so that the direction of movement of the drive magnet is different from the magnetization direction of the bias magnet. Therefore , if the reed switch control device of the present invention is applied to a push button switch, the bias magnet, the driving magnet, and the reed switch are kept out of contact with each other, eliminating the place where they rub against each other, and the push button switch is improved. Longer life can be achieved.

In the present invention, preferably, the drive magnet has a plate-like shape with a short length in the magnetization direction and the drive direction to reduce the movement distance required to turn on or off the reed switch. It is possible to set.

(2) A push button switch according to the present invention includes a push button, a reed switch control device according to the present invention, and a structure for moving the drive magnet in a magnetization direction by moving the push button. .

According to the present invention, since the above-described reed switch control device is used, it is possible to provide a thin push button switch with a short operation stroke of the push button. Then, the door opening/closing operation can be easily performed, and a thinner and longer-life push button switch can be obtained.

(1) According to the reed switch control device of the present invention, it is possible to provide a reed switch control device in which the operation stroke of the push button provided in the push button switch can be shortened and the thickness of the push button switch can be reduced. can.

Further, according to the reed switch control device of the present invention, in the push button switch provided with the reed switch control device, the push button operation for opening and closing the door can be easily performed, and the life of the push button switch is extended. It is possible to provide a reed switch control device that can contribute to

(2) According to the push button switch of the present invention, when it is used for opening and closing the doors of trains and railcars, it is possible to easily open and close the doors, and it is possible to provide a thin and long-life push button switch. .

1(a) and 1(b) are respectively a plan view and a side view of a reed switch control device according to an embodiment of the present invention. FIG. 2 is a diagram showing on/off boundary characteristics of the reed switch shown in FIG. 8 in the reed switch control device of the embodiment. FIG. 3 is a diagram for explaining the operation of the reed switch control device of the embodiment. FIG. 4 is a diagram for explaining the operation of the reed switch control device of the embodiment. FIG. 5 is a perspective view of a push button switch provided with the reed switch control device of the embodiment. FIG. 6 is a schematic perspective view of a conventional push button switch. 7(a) and 7(b) are a plan view and a side view, respectively, showing the arrangement of a magnet and a reed switch in a conventional push button switch. FIG. 8 is a diagram showing the position of a magnet magnetized in a direction perpendicular to and toward the reed switch and the on/off boundary characteristics of the reed switch.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows the configuration of a reed switch control device according to an embodiment of the present invention. 1A is its plan view, and FIG. 1B is its side view.

A push button switch including a reed switch control device according to this embodiment includes a push button (not shown) and a casing (not shown) in which the push button appears and retracts. Although not specifically shown, the push button is configured to appear and disappear inside and outside the casing by pushing it in the z direction or releasing the pushing operation.

In FIG. 1, reference numeral 1 denotes the entire reed switch control device. This reed switch control device 1 is a device for controlling ON/OFF of a reed switch 2 and includes a bias magnet 4 and a drive magnet 42 .

The reed switch 2 is fixed in the casing with its electrode axis direction (longitudinal direction) in the x direction. , it moves in the z-direction while maintaining a constant interval in the x- and y-directions.

The reed switch 2 includes a right electrode 21 and a left electrode 22, a contact is provided in a gap 23 between them, and both electrodes 21, 22 are enclosed in a glass container 24 together with an inert gas. The ON/OFF state of the reed switch 2 is led out of the glass container 24 through the terminal 25 . The gap 23 of the reed switch 2 is the origin of coordinates in the three-dimensional orthogonal coordinate system.
The electrodes of the reed switch 2 are composed of a right electrode 21 and a left electrode 22 in the x direction. Both electrodes 21 and 22 are conductive when the reed switch 2 is on.

The bias magnet 4 acts like a conventional magnet, but is fixed in position. The bias magnet 4 has a magnetic pole axis consisting of an N magnetic pole and an S magnetic pole, and is magnetized so that the direction of this magnetic pole axis is the y direction perpendicular to the electrode axis direction on a plane including the electrode axis of the reed switch 2. ing.

The drive magnet 42 is magnetized in the z-direction perpendicular to the electrode axis direction of the reed switch 2 and the magnetization direction of the bias magnet 4. The drive magnet 42 is attached to suitable magnet moving means (not shown) and connected to a push button. It can be moved in the direction of magnetization by the magnet moving means in accordance with the operation of the button.

That is, the magnetic pole axis of the drive magnet 42 is in the z-direction as shown in FIG. 1(b), and the drive magnet 42 moves in its magnetization direction. The driving magnet 42 faces either the right electrode 21 or the left electrode 22 in the vicinity of the reed switch 2, and its N magnetic pole or S magnetic pole moves toward the reed switch 2 when moving in the z direction. approaches one of the electrodes 21 and 22 on the left and right sides of the .

The magnetic force of the bias magnet 4 is strong enough to turn on the reed switch 2, and its position x1 on the x-axis is the position of the gap 23 of the reed switch 2, which is the right side of the coordinate origin (x>0). ), one of the magnetic poles of the bias magnet 4, such as the N magnetic pole, magnetizes the right electrode 21 of the reed switch 2. As shown in FIG.

The bias magnet 4 is fixed at a position y1 in or near the hysteresis region between the on region where the reed switch 2 is turned on and the off region where the reed switch 2 is turned off.

The drive magnet 42 is near one electrode of the reed switch 2, the right electrode 21, or near the other electrode of the reed switch 2, the left electrode 22, like the drive magnet 42' shown in dashed lines. placed in

The driving magnet 42 moves in the z-direction so that its N magnetic pole or S magnetic pole approaches the reed switch 2 .

As an example, the north and south magnetic poles of the bias magnet 4 and the drive magnet 42 are arranged as shown in FIGS. 1(a) and 1(b). The N magnetic pole of the bias magnet 4 magnetizes the right electrode 21 of the reed switch 2 to N polarity, and assumes that the reed switch 2 is in the hysteresis region of operation.

When the drive magnet 42 moves to the right (0<z) through the side of the reed switch 2 (z=0) as shown in FIG. The right electrode 21 of the reed switch 2 is magnetized to N polarity. Assisting the magnetization of the bias magnet 21, the reed switch 2 is turned on.

When the drive magnet 42 passes by the reed switch 2 in FIG. 1(b) and moves in the -z direction, that is, to the left (z<0), the S magnetic pole of the drive magnet 42 approaches the reed switch 2, causing the reed switch to move. 2 electrode 21 is magnetized to S polarity. As a result, the magnetization of the right electrode 21 of the reed switch 2 by the N magnetic pole of the bias magnet 4 is weakened, and the reed switch 2 is turned off.

As shown in FIG. 1(b), the driving magnet 42 is a plate-like magnet having a rectangular shape when viewed from the side, and its thickness direction is the z direction. This thickness direction is the magnetization direction of the driving magnet 42 and the driving direction. The drive magnet 42 has a short length in the magnetization direction and the drive direction due to the shape described above, so that the movement distance required to turn the reed switch 2 on or off can be set small.

Further details will be described below.

In this embodiment, one of the control characteristics shown in FIG. 9, 0<X or X<0, is used for the position of the bias magnet 4 and the ON region and OFF region of the reed switch 2 . FIG. 2 shows the characteristics of the on-region and off-region of FIG. 9 again.

In FIG. 2, ON is the ON boundary that defines the boundary between the ON region and the hysteresis region, OFF is the OFF boundary that defines the boundary between the OFF region and the hysteresis region, and xM is on the x-axis of the bias magnet 4. Position, yM, indicates the position of the bias magnet 4 on the y-axis. The ON region is the region where the bias magnet 4 is close to the reed switch 2 and the position yM of the bias magnet 4 on the y-axis is inside the ON boundary line ON. The off region is the region where the bias magnet 4 is far from the reed switch 2 and the position yM of the bias magnet 4 on the y-axis is outside the off boundary line OFF. The region between the position yM on the y-axis of the bias magnet 4 and the ON boundary line ON and the OFF boundary line OFF is the hysteresis region.

When the bias magnet 4 maintains a constant distance xM in the x-direction with respect to the reed switch 2, the position yM in the y-direction changes, and when this position yM is in the off region outside the off boundary line OFF, the reed switch 2 is turned off. , and the ON boundary line ON, the reed switch 2 is turned ON. When the bias magnet 4 is in the hysteresis region between the boundary line OFF and the boundary line ON, the reed switch 2 operates hysteresis.

When the central position xM of the bias magnet 4 in the x direction is within or near the hysteresis region between the two ON/OFF boundary lines ON and OFF near the origin of coordinates as shown in FIG. ON/OFF of the reed switch 2 changes depending on the position of the y direction.
This phenomenon will be explained below.

When the central position xM of the bias magnet 4 on the x-axis is on the y-axis, that is, to the right of the position of the gap 23 at x=0, the bias magnet 4 pulls the right electrode 21 of the reed switch 2 to N. Magnetized, the magnetic flux passes from the right electrode 21 of the reed switch 2 through the gap 23 and creates an attractive force to close the gap 23 .

When the position yM of the bias magnet 4 on the y-axis is small and the magnetization is strong, the gap 23 of the reed switch 2 is closed and the reed switch 2 is turned on.

When the position yM of the bias magnet 4 on the y-axis is large, the magnetization of the bias magnet 4 to the electrode 21 of the reed switch 2 is weak and the reed switch 2 is turned off.

When the gap 23 is closed, the magnetic flux easily passes through and the attractive force increases. When the gap 23 is open, the attractive force is small.

When the central position xM of the bias magnet 4 on the x-axis is directly above the gap 23 of the reed switch 2, near xM=0, the bias magnet 4 magnetizes the left and right electrodes 21 and 22 of the reed switch 2 to the same polarity. Therefore, the magnetic flux of the bias magnet 4 does not pass through the gap 23 of the reed switch 2, and the reed switch 2 is always off.

When the central position xM of the bias magnet 4 on the x-axis is to the left of the y-axis, that is, the gap position of x=0, the flow of magnetic flux is reversed left and right, but the on/off characteristics of the reed switch 2 are similar to those of the bias magnet. The on/off region characteristics are bilaterally symmetrical, which is the same as when the center position xM on the x-axis of 4 is located to the right of the gap position of x=0.

Assume that the bias magnet 4 is fixed in the hysteresis region as shown in FIG.

In FIG. 2, the arrangement of the bias magnet 4 has been explained, but with reference to FIGS. 3 and 4, the case where the drive magnet 42 is arranged will be explained.

First, as shown in FIG. 3, when the center position xM on the x-axis of the bias magnet 4 that generates magnetic flux in the gap 23 of the reed switch 2 is x1 and the position yM on the y-axis is y1, the reed switch 2 The right electrode 21 of is magnetized to N polarity.

At this time, if the N magnetic pole of the drive magnet 42 approaches the right electrode 21 of the reed switch 2 and the right electrode 21 is magnetized to N polarity, even if the bias magnet 4 is fixed in the hysteresis region, Equivalent to the case where the bias magnet 4 moves to the position 4' indicated by the dotted line and the position y1 of the bias magnet 4 on the y-axis becomes smaller, the operating point of the reed switch 2 can move from the hysteresis region to the ON region. I can.

When the S magnetic pole of the driving magnet 42 approaches the left electrode 22 of the reed switch 2 as indicated by position 42', the magnetization difference between one electrode 21 and the other electrode 22 of the reed switch 2 increases. , intensifies the magnetic flux flow in the gap 23 and turns on the reed switch 2 . As a result, the S magnetic pole of drive magnet 42 has the same effect as the N magnetic pole of drive magnet 42 .

In FIG. 4, opposite to the case of FIG. 3, the S magnetic pole of the drive magnet 42 is brought closer to the right electrode 21 of the reed switch 2, or the N magnetic pole of the drive magnet 42 is brought closer to the reed switch as indicated by the dotted line position 42''. 2, magnetize the right electrode 21 of the reed switch 2 to S polarity, or magnetize the left electrode 22 of the reed switch 2 to N polarity, and magnetize the left and right electrodes 21 and 22 in the gap 23. , the magnetic flux is reduced, the attractive force is reduced, and the reed switch 2 is turned off.

Therefore, even if the bias magnet 4 is fixed in the hysteresis region, the movement of the drive magnet 42 causes the reed switch 2 to operate in the same manner as when the bias magnet 4 is separated from the reed switch 2 to the position 4'' indicated by the dotted line. A point can be moved to an off area.

Taking the above two together, even if the bias magnet 4 is fixed in the hysteresis region, the operation of the reed switch 2 can be controlled by bringing the N or S magnetic pole of the drive magnet 42 closer to the right electrode 21 or the left electrode 22 of the reed switch 2. Points can be moved to ON or OFF regions.

If one of the electrodes 21 and 22 of the reed switch 2 is magnetized to the N or S pole by moving the driving magnet 42 having a weak magnetizing force in the z direction in this way, even if the bias magnet 4 is fixed in the hysteresis region, the reed is Switch 2 can be driven on or off.

FIG. 5 is a perspective view showing the main part of a push button switch having the reed switch control device of the present invention. The push button switch 6 includes a reed switch control device 1 for controlling on/off of the reed switch 2, a push button 3 that can be pushed in the arrow direction (z direction), and a push button 3 at the center in the y direction. It has a spring 5 that is pushed downward (z-direction). The reed switch control device 1 has a bias magnet 4 and a drive magnet 42 .

In this push button switch 6, the bias magnet 4 is magnetized in the y-direction and fixed at or near the position (hysteresis region) where the reed switch 2 performs hysteresis operation during on/off operation. The drive magnet 42 is magnetized in the vertical direction (z direction). The drive magnet 42 is attached to the front end of the leaf spring 5 in the y-direction, and according to the bending of the leaf spring 5, the front end side in the y-direction moves in the z-direction along the side of the reed switch 2, and the N magnetic pole or the S pole of the drive magnet 42 moves. The magnetic pole approaches reed switch 2 .

The right end (rear end) of the leaf spring 5 in the y direction is fixed, and the central portion in the y direction is bent in the z direction by being pushed or returned by the push button 3, and the drive magnet 42 attached to the front end of the leaf spring 5 is flexed. It is moved in the z-direction to turn on/off the reed switch 2 .

According to the push button switch 6, when the push button 3 is pushed in the y direction, the front end side of the leaf spring 5 bends downward in the z direction, and the drive magnet 42 fixed to the front end side of the leaf spring 5 is magnetized. , and the reed switch 2 is turned on and off according to the principle described above.

According to the push button switch 6, the operation stroke of the push button 3 can be expanded by the leaf spring 5, and the reed switch 2 can be turned on and off. A push button switch 6 that is thin in the direction of operation of the push button 3 can be provided. As a result, when the push button switch 6 is used as a switch for opening and closing the doors of electric trains and diesel trains, it is possible to obtain a thin and long-life push button switch that facilitates door opening and closing operations.

2 reed switch 21 reed switch electrode 22 reed switch electrode 23 reed switch gap 24 reed switch glass container 25 reed switch terminal 3 push button 4 bias magnet 4' bias magnet 4'' bias magnet 42 drive magnet 42' drive Magnet 42'' Drive magnet 5 Leaf spring ON ON border OFF OFF border

Claims (2)

In a reed switch control device that controls on/off of a reed switch,
a bias magnet magnetized in a direction orthogonal to the electrode axis direction on a plane including the electrode axis of the reed switch;
a drive magnet magnetized in a direction orthogonal to the electrode axis direction of the reed switch;
with
the bias magnet is fixed in or near a hysteresis region between an on region where the reed switch is turned on by its magnetic force and an off region where the reed switch is turned off;
The driving magnet is
When the drive magnet moves in one of the magnetization directions through the vicinity of the reed switch, one of the N magnetic pole and the S magnetic pole approaches one electrode of the reed switch to magnetize the one electrode. and driving the reed switch to ON by assisting the ON operation by the bias magnet, and
When the driving magnet moves in the other magnetization direction through the vicinity of the reed switch, the other magnetic pole of the N magnetic pole or the S magnetic pole approaches the one electrode of the reed switch to magnetize the one electrode. and the reed switch is turned off by blocking the ON operation by the bias magnet ,
The drive magnet has a plate-like shape with a short length in its magnetization direction and movement direction,
A reed switch control device characterized by: a push button;
a reed switch control device according to claim 1;
a structure for moving the drive magnet in its magnetization direction by moving the push button;
A push button switch comprising:

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