JP5349545B2 - Reed switch control device and push button switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable thin formation of a reed switch control device and a push button switch by reducing a movement stroke of a magnet. <P>SOLUTION: A magnet 4 is configured to move toward a direction (Z axis direction) intersecting with an electrode axis (X axis) of a reed switch 2 at a right angle. A magnetic pole axis of the magnet 4 is in parallel with an orthogonal axis (Y axis) orthogonal to the X axis and the Z axis. At a position having an interval from the magnet 4 in the movement direction, there is disposed an auxiliary magnetic pole body 7 (71) composed of a magnetic substrate and becoming a magnetic pole having a reverse polarity to the magnetic pole of the magnet 4 on the reed switch 2 side. The magnet 4 and the auxiliary magnetic pole body 7 (71) are configured to be movable to a movement direction of the magnet 4 while maintaining a constant interval. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to a reed switch control device and a push button switch including the reed switch control device.

  For trains and diesel trains with few passengers, the doors are left unnecessarily open for a long time when the train is stopped at the station. Some have a semi-automatic door that can be opened and closed by passengers to prevent the temperature from rising.

  In the vehicle as described above, push button switches are installed as door opening / closing switches on the vehicle exterior side and the vehicle interior side of the door accommodating portion.

  As shown in FIG. 9, this type of push button switch has conventionally been provided with a reed switch 2 fixedly provided in the casing and a push button 3 that can be moved into and out of the casing. A push button switch having a magnet 4 for driving the reed switch 2 is provided on the surface of the reed switch 2 side.

  In FIG. 9, the entire casing is not shown. In the example of FIG. 9, the direction of the magnetic pole axis of the magnet 4 is set to a direction orthogonal to the direction of the electrode axis (also the length direction) of the reed switch 2, and one of the S or N magnetic poles. Is facing the reed switch 2 side.

  In the push button switch configured as described above, since the contact portion is a reed switch, it can be used at a relatively high voltage, and can be easily installed on a vehicle such as a train. Therefore, there is an advantage that the entire thickness is within the thickness obtained by adding the displacement stroke to the depth length of the push button, and the thickness can be reduced.

JP 2001-184993 A

  As described above, when a reed switch control device such as a push button switch is configured with a reed switch and a magnet, there is room for improvement when examining the action of the magnet on the reed switch, and the reliability of the on / off operation is improved. It is desirable to further shorten the moving stroke of the magnet without damaging it.

  When the inventors of the present invention have studied, the reed switch control device (or push button switch) shown in FIG. 9 has the following problems.

  In the reed switch control device, the reed switch and the magnet are arranged as shown in the arrangement diagram of FIG. That is, assuming that the electrode axis direction of the reed switch 2 is the X-axis direction, the X-axis direction is orthogonal to the paper surface of FIG. 10, and the magnetic pole direction of the magnet 4 is the Y-axis direction orthogonal to the X-axis direction. The magnet 4 moves in the Z-axis direction orthogonal to the Y-axis and the X-axis.

  If the N pole of the magnet 4 is directed toward the reed switch 2, the magnetizing force of the magnet 4 with respect to the reed switch 2 is as shown in FIG.

  The magnetizing force of the magnet 4 on the reed switch 2 is maximized at the position in the Z-axis direction (z = 0) where the magnet 4 is closest to the reed switch 2, but the value of Z increases on both sides in the Z-axis direction. Alternatively, the magnetic force gradually decreases as the magnetic field decreases, and at a position that is considerably distant from z = 0 in the Z-axis direction, becomes lower than the magnetic force level at which the reed switch 2 is turned on (referred to as on-magnetizing force in the characteristic diagram). It becomes below the magnetizing force level (referred to as off-magnetizing force) at which the reed switch 2 is turned off at a position farther than that. The reed switch 2 is turned off at a position where the magnet 4 moves in the Z-axis direction with respect to the reed switch 2 and its magnetizing force falls below the off-magnetizing force level of the reed switch.

  Therefore, with respect to the reed switch 2, the magnet 4 moves at least from a position where the magnetizing force exceeds the on-magnetizing force level (−5 <z) to a position below the off-magnetizing force level (z <−8). Thus, the reed switch 2 is turned on / off.

  However, when the position of the magnet 4 is Z = 0, as described above, the magnetizing force is gradually decreasing, so that the magnetizing force is below the off magnetizing force level from the position where the magnetizing force exceeds the on magnetizing force level. It is necessary to move the magnet 4 with a long stroke relative to the reed switch 2 (for example, St: z = -11 to -4 in the figure), and the reed switch control device or the push button switch is thinned. There is a limit.

  The present invention addresses the above-described problems, and the reed switch control device according to the present invention is configured such that the magnet moves in a direction perpendicular to the electrode axis (X axis) of the reed switch. A reed switch control device in which a switch is turned on and off, wherein the magnet has a magnetic pole axis on an orthogonal axis (Y axis) perpendicular to the electrode axis of the reed switch and the moving direction of the magnet (Z axis direction). An auxiliary magnetic pole body made of a magnetic material and having a polarity opposite to the magnetic pole on the reed switch side of the magnet is disposed at a position spaced in the moving direction of the magnet, and the magnet and the auxiliary magnetic pole The body is movable in the moving direction of the magnet while maintaining a constant interval.

  As an embodiment of the above configuration, the auxiliary magnetic pole body may be provided in a state separated from the magnet, but preferably, a yoke is provided on the side opposite to the reed switch (the side far from the reed switch), and the magnet is formed by the yoke. The magnetic force of the magnetic pole on the side opposite to the reed switch is guided to the auxiliary magnetic pole body.

  Alternatively, the yoke may be provided on the side opposite to the reed switch of the magnet, and the end of the yoke may be extended to the side of the reed switch.

  In the above configuration, the auxiliary magnetic pole body disposed at a distance from the magnet acts as a magnetic pole having a weak reverse polarity to the magnetic pole on the reed switch side of the magnet. The magnetizing force for the reed switch is a combination of the magnetizing forces of the reed switch side magnetic pole and the auxiliary magnetic pole body of the magnet, but the magnet and the auxiliary magnetic pole body are arranged at intervals in the moving direction and are opposite to each other. Because of the polarity, the resultant magnetization force applied to the reed switch cancels each other between the magnet and the auxiliary magnetic pole body, and from N to magnetization force = 0 to S or from S to magnetization force = 0 as the magnet moves. It changes rapidly to N.

  Therefore, for example, if the auxiliary magnetic pole moves from the position where the magnet is close to the reed switch to the position where the auxiliary magnetic pole body is close to the reed switch, the reed switch is switched from on to off during that time, and the magnet is short distance Just move.

  In the above configuration, the auxiliary magnetic pole body may have the same shape as the magnet, but the magnetizing force of the auxiliary magnetic pole body is combined with the magnetizing force of the magnet to reduce the combined magnetic force between the magnet and the auxiliary magnetic pole body. Therefore, as described above, the yoke may be omitted, or the yoke may be used also as the auxiliary magnetic pole body.

  In the above configuration, the arrangement of the magnet and the auxiliary magnetic pole body in the moving direction can be exchanged, and the reed switch is switched from off to on with the movement of the magnet and the auxiliary magnetic pole body. Can be configured to switch from on to off, and the reed switch can be a contact or b contact.

  The push button switch according to the present invention includes the reed switch control device having the above-described configuration, and has a push button provided so as to be movable in and out of the casing as means for moving the magnet and the auxiliary magnetic pole body.

  According to the present invention, the magnetizing force acting on the reed switch is greatly increased or decreased just by moving the magnet over a short distance with respect to the reed switch, so that the moving distance of the magnet can be shortened. The push button switch equipped with this control device can be thinned.

  Further, according to the present invention, since a single magnet and an auxiliary magnetic pole body made of a magnetic body magnetized by the magnetic force of the magnet need only be provided for the reed switch, the configuration is simple and can be manufactured at low cost.

The front view of the pushbutton switch which concerns on the 1st Embodiment of this invention. Sectional drawing in the (2)-(2) line | wire of FIG. The perspective view which shows the positional relationship of the magnet and reed switch in the said 1st Embodiment. The arrangement diagram of the magnet and reed switch in the first embodiment. The characteristic view which shows the strength of the magnetizing force with respect to the reed switch of the magnet in the positional relationship of FIG. The arrangement diagram of the magnet and the reed switch in the second embodiment of the present invention. The arrangement diagram of the magnet and reed switch in the reference example of the present invention. The arrangement diagram of the magnet and reed switch in the 4th embodiment of the present invention. The schematic perspective view of the conventional pushbutton switch. The arrangement diagram of the magnet and reed switch of the conventional push button switch. The characteristic view which shows the strength of the magnetizing force with respect to the reed switch of the magnet of the said conventional pushbutton switch.

[First Embodiment]
1 to 5 show a first embodiment of the present invention. As shown in FIGS. 1 and 2, the push button switch according to the first embodiment includes a casing 1, a reed switch 2, a push button 3, and a magnet (permanent magnet) involved in opening / closing the reed switch 2. 4, an auxiliary magnetic pole body 7 made of a magnetic material, and a yoke 8.

  The casing 1 is made of synthetic resin, and a reed switch 2 is fixedly mounted inside. The reed switch 2 has a predetermined orientation in which the electrode axis (which is also the longitudinal axis) faces the left and right of the casing 1.

  The push button 3 is a short shaft body made of synthetic resin, and is held in the casing 1 so as to be able to slide for a fixed stroke in the axial direction of the shaft body and in a direction perpendicular to the electrode axis of the reed switch 2. At least the front portion thereof is displaced from the casing 1. A hook 3a for restricting the sliding range is integrally formed in the middle of the push button 3, and a spring 5 for urging the push button 3 in the protruding direction is provided at the rear. On the front surface of the casing 1, a cover plate 6 for receiving the collar 3a of the push button 3 is attached.

  The magnet 4 is attached together with the auxiliary magnetic pole body 7 and the yoke 8 so as to be embedded on the side facing the reed switch 2 of the push button 3, and is in the axial direction of the push button 3 and orthogonal to the electrode axis of the reed switch 2. To move in the direction you want. The auxiliary magnetic pole body 7 becomes a magnetic pole having a polarity opposite to that of the magnet 4 on the side of the reed switch 2 due to the magnetic force of the magnet 4, and is arranged at an interval in the moving direction from the magnet 4. The magnet 4 and the auxiliary magnetic pole body 7 face a portion displaced to the left and right side of the reed switch 2 so that a magnetic force acts on one lead piece of the reed switch 2. In this case, the reed switch receives different magnitudes of magnetizing force on the fixed piece and the movable piece, and an attracting force is generated in the gap due to the difference in magnetization, and the gap is closed and driven on.

  The arrangement and moving direction of the magnet 4 and the auxiliary magnetic pole body 7 with respect to the reed switch 2 will be described in more detail. As shown in FIGS. 3 and 4, the electrode axis of the reed switch 2 is the X axis, and the electrode axis of the reed switch 2 is When the direction of movement of the magnet 4 and the auxiliary magnetic pole body 7 is parallel to the Z axis and the orthogonal axis orthogonal to both the X axis and the Z axis is the Y axis, The magnetic pole axis (S-N axis) is parallel to the Y axis, and the magnet 4 and the auxiliary magnetic pole body 7 are spaced from each other in the Z axis direction at a position y on the Y axis with respect to the reed switch 2. In addition, on the reed switch 2 side, the magnetic pole of the magnet 4 and the magnetic pole of the auxiliary magnetic pole body 7 are opposite in polarity. In this embodiment, the N pole of the magnet 4 and the auxiliary magnetic pole body 7 are on the reed switch 2 side. The south pole is suitable.

  When the push button 3 is not operated, as shown in FIG. 4, when the auxiliary magnetic pole body 7 is in a position close to the reed switch 2 and the push button 3 is pushed in for a predetermined stroke, the magnet 4 moves to the reed switch 2. It comes to be close.

  In the above configuration, before the push button 3 is pushed in, the auxiliary magnetic pole body 7 is in a position close to the reed switch 2 (position in FIG. 4), and the magnetic force of the auxiliary magnetic pole body 7 is weak. Although it is off, when the magnet 4 moves on the Z axis in the z-increasing direction as the push button 3 is pushed, the magnetizing force acting on the reed switch 2 immediately before the magnet 4 is closest to the reed switch 2 Increases rapidly, the reed switch 2 is switched from OFF to ON, and the reed switch 2 is maintained in the ON state at the position where the magnet 4 is closest to the reed switch 2.

  This operation will be described in detail with reference to FIGS. FIG. 5 shows the characteristics of the magnetizing force acting on the reed switch 2 when the position of the magnet 4 in the Z-axis direction is changed from the position shown in FIG. 4 together with the auxiliary magnetic pole body 7. Z = 0 when the magnet 4 is closest to the reed switch 2, and z = -10 when the auxiliary magnetic pole body 7 is closest to the reed switch 2. The magnetizing force exerted on the reed switch 2 is a combination of the magnetizing force that each of the magnet 4 and the auxiliary magnetic pole body 7 has independently. In FIG. 5, the magnetizing force of the magnet 4 and the auxiliary magnetic pole body 7 alone is indicated by a dotted line, and the combined magnetizing force is indicated by a solid line.

  As shown in FIG. 5, the combined magnetizing force of the magnet 4 and the auxiliary magnetic pole body 7 changes more rapidly than the magnetizing force of the single magnet 4 between the magnet 4 and the auxiliary magnetic pole body 7. When the position is z = -4, the reed switch 2 is turned on, and when z = -5.5, the reed switch 2 is turned off. With the magnetizing force of the magnet 4 alone, the necessary amount of movement of the magnet 4 is halved compared to when the reed switch 2 is turned on when z = -5 and the reed switch 2 is turned off when z = -8. The maximum magnetizing force at z = 0 is almost the same. Therefore, as shown in FIG. 5, for example, by setting the position z = −8 to −2 as the stroke of the push button 3, the reed switch 2 is reliably turned on and off. As a push button switch, the operation is a contact.

  As can be seen from the above operation, in the first embodiment, the magnet 4 mainly turns on the reed switch 2, and the auxiliary magnetic pole body 7 gives a steep change in the magnetizing force to the reed switch 2.

[Second Embodiment]
FIG. 6 shows the positional relationship between the magnet and the reed switch in the second embodiment.

  In the second embodiment, the auxiliary magnetic pole body 71 that is moved together with the magnet 4 is used as the auxiliary magnetic pole body 71 without using the auxiliary magnetic pole body as an independent member as shown in the first embodiment. . That is, since the yoke 8 is a ferromagnetic material, the magnetic flux is guided from the S pole of the magnet 4 toward the reed switch 2 to give the S magnetizing force. Although the action is weaker than when the auxiliary magnetic pole body 7 which is an independent member is used, since the magnet 4 has a magnetizing force opposite to that of the magnet 4, the magnetizing force characteristic when the magnet 4 moves is close to that shown in FIG. This has the effect of steeply changing the magnetizing force received by the reed switch 2 as the magnet 4 moves. As shown in the first embodiment, the structure is simpler than when the auxiliary magnetic pole body 7 which is an independent member is used.

[ Reference example ]
FIG. 7 shows the positional relationship between the magnet and the reed switch in the reference example .

In this reference example , only the auxiliary magnetic pole body 7, which is an independent member, is used together with the magnet 4, and the yoke 8 is omitted. The auxiliary magnetic pole body 7 receives the induction from the magnet 4 and generates a magnetic pole having the polarity shown in the figure (a magnetic pole having a polarity opposite to that of the magnet 4 on the reed switch 2 side). The magnetization characteristic for the reed switch 2 is basically the same as that shown in FIG.

[Fourth Embodiment]
FIG. 8 shows the positional relationship among the magnet, the auxiliary magnetic pole body, and the reed switch in the fourth embodiment, and the positions of the magnet 4 and the auxiliary magnetic pole body 7 in the first embodiment are interchanged.

  When the magnet 4 and the auxiliary magnetic pole body 7 move in the Z-axis direction in parallel, the position where the magnet 4 is closest to the reed switch 2 (position in FIG. 8) is set to z = 0, and the auxiliary magnetic pole body 7 is connected to the reed switch 2. The closest approach position is set to z = 10. The magnetization characteristic for the reed switch 2 is a characteristic in which z = 0 in FIG.

  When the magnet 4 and the auxiliary magnetic pole body 7 move in the increasing direction of z according to the operation of the push button 3, the reed switch 2 is turned on at the magnet position z = 0 when not operated. When the push button is pressed, the reed switch 2 is turned off at z = 5.5, and when the push button is returned, the lead switch 2 is turned on at z = 4. As a push button switch, the b contact is operated.

  Thus, the a contact or the b contact can be easily configured by exchanging the positions of the magnet 4 and the auxiliary magnetic pole body 7.

1 Casing 2 Reed Switch 3 Push Button 4 Magnet 7 Auxiliary Magnetic Pole 8 Yoke

Claims (3)

A reed switch control device in which the reed switch is turned on and off by moving a magnet in a direction perpendicular to the electrode axis with respect to the reed switch,
The magnet is located the pole axis on orthogonal axes perpendicular to the moving direction of the electrode axis and the magnets of the reed switch, consisting of magnetic material element in a position spaced 1 way of the moving direction and the magnet auxiliary A magnetic pole body is arranged, and the magnetic force of the magnetic pole on the anti-reed switch side of the magnet is guided to the auxiliary magnetic pole body by a yoke provided on the anti-reed switch side of the magnet, and the magnet and the auxiliary magnetic pole body are constant. A reed switch control device, wherein the reed switch control device is movable in the moving direction of the magnet while maintaining an interval. In the reed switch control device according to claim 1,
A reed switch control device, wherein a yoke is provided on the side opposite to the reed switch of the magnet, and the yoke serves as the auxiliary magnetic pole body. A push button switch comprising the reed switch control device according to claim 1 or 2 ,
A push button switch comprising a push button provided so as to be movable in and out of the casing as means for moving the magnet and the auxiliary magnetic pole body.

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