JP2012221618A - Reed switch control device and push-button switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce thickness of a reed switch control device and a push-button switch by shortening a moving stroke of magnets without impairing reliability of on/off operation.SOLUTION: Magnets are provided so as to be movable in a direction (Z-axis direction) perpendicularly intersecting an electrode axis (X-axis) of a reed switch 2. The magnets include a first magnet 4a having a magnetic pole axis parallel to an orthogonal axis (Y-axis) perpendicular to the X-axis and the Z-axis, and a second magnet 4b having a magnetic pole axis parallel to the first magnet 4a and a reverse polarity to the first magnet 4a, and is arranged with an interval from the first magnet 4a in the moving direction of the first magnet 4a. The two magnets 4a and 4b are movable in the above-described direction while maintaining the interval and the direction of the magnetic pole.

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.

  Conventionally, as shown in FIG. 12, this type of push button switch includes a reed switch 2 fixedly provided in the casing and a push button 3 that can be moved in 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 addition, in FIG. 12, illustration of the whole casing is abbreviate | omitted. In the example of FIG. 12, the direction of the magnetic pole axis of the magnet 4 is set parallel to the direction orthogonal to the direction of the electrode axis of the reed switch 2 (which is also the length direction). The magnetic pole is directed to 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.

  First, starting with the description of the reed switch, in the reed switch, the fixed lead and the movable reed are opposed to each other with a gap therebetween, and if each lead piece is magnetized to N and S, the magnetic flux passes through the gap. A suction force is generated and the contact is turned on. Also, when one lead piece of the fixed lead and the movable lead is magnetized to N or S, a difference in magnetization occurs between the two lead pieces, so that magnetic flux passes through the gap to generate an attractive force. In many cases, the push switch reed switch control device has a structure in which only one lead piece is magnetized in order to simplify the structure and reduce the size.

  In the following, a reed switch control device that controls the reed switch to be turned on and off by the strength of the magnetization of the reed piece on one side will be described. The attraction force acting on the gap between the reed pieces of the reed switch It depends on the strength of magnetization. If the magnetizing force is large, the attracting force of the gap is large, so the contact is closed and the reed switch is driven on. If the magnetizing force is small, the gap attracting force is small, the contact is opened by the spring force of the lead piece, and the reed switch is turned off. If the reed switch is close to the N or S pole of the magnet, it is strongly magnetized. If it is equidistant from the N and S poles, even if it is a strong magnetic pole, it is not magnetized by N or S, and the magnetization is zero. Therefore, the suction force of the gap becomes zero.

  When the inventors of the present invention have studied, the reed switch control device (or push button switch) shown in FIG. 12 has the following problems.

  In the reed switch control device, assuming that the direction of the electrode axis of the reed switch 2 is the X-axis direction, the X-axis direction is a direction orthogonal to the paper surface in the layout diagram of FIG. It is set in the Y-axis direction that intersects the X-axis direction at right angles, and the magnet 4 moves in the Z-axis direction that is orthogonal to the Y-axis direction and orthogonal to the X-axis direction.

  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. In addition, the numerical value of the Z axis in FIG. 14 is the same scale as FIGS.

  The magnetizing force of the magnet 4 with respect to the reed switch 2 is maximized at a position in the Z-axis direction where the magnet 4 is closest to the reed switch (z = 0), but on both sides of the Z-axis direction, the value of Z is As the magnetic field increases or decreases, the magnetic force gradually 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 an on magnetic force in the characteristic diagram). It becomes below the magnetization force level (referred to as off-magnetization force) at which the reed switch 2 is turned off at a position further away from it. 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, the reed switch 2 is turned on / off by moving the magnet 4 at least from a position where the magnetizing force exceeds the on-magnetizing force level to a position below the off-magnetizing force level with respect to the reed switch 2.

  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. The distance St is long, and it is necessary to move the magnet 4 by a long stroke with respect to the reed switch 2, and there is a limit to reducing the thickness of the reed switch control device or the push button switch.

  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 (Z axis direction) of the magnet. A first magnet, a second magnetic pole having a magnetic pole whose axis is parallel to the first magnet and having a polarity opposite to that of the first magnet, and which is arranged at an interval in the moving direction of the first magnet. The first and second magnets are movable in the moving direction while maintaining the distance and the direction of the magnetic poles.

  When there are two magnets as in the reed switch control device of the present invention, the magnetizing force of these magnets with respect to the reed switch is a combination of the magnetizing forces of the respective magnets. When the magnetic pole directions are opposite in polarity to each other, the magnetizing force applied to the reed switch is changed from N to S or from S to S between two magnets according to the movement of the magnet. It changes rapidly to N. Further, the point between the two magnets passes through a point where the magnetizing force is zero.

  Thus, between two magnets of opposite polarity, the magnetizing force acting on the reed switch greatly changes, and the reed switch is switched on and off.

  Thus, for example, if two magnets move from a position where one of them is close to the reed switch to a position where the magnetizing force suddenly decreases between the two magnets, the reed switch switches on and off. As a result, the two magnets need only travel a very short distance.

  In the above invention, the first magnet and the second magnet may be arranged at the same position in the Y-axis direction, but as another embodiment, along the Y-axis direction of the first magnet and the second magnet. The positions may be different, and the Z-axis direction may be moved integrally.

  In particular, if there is no difference in the position of both magnets in the Y-axis direction, there will be a z-region with a large N or S magnetizing force near the closest position of each magnet. May enter the z-region where the magnetizing force is large and turn on twice, but if the two magnets have different positions in the Y-axis direction as described above, the magnet far from the reed switch will Even if the reed switch is turned on even in the vicinity of the closest position, a large magnetizing force is not applied, and the reed switch can be prevented from being turned on again even if both magnets move a long stroke.

  As still another embodiment, the second reed switch can be arranged adjacent to the reed switch in the magnet moving direction. In this embodiment, as both magnets move, one reed switch can be switched from off to on, and the other reed switch can be switched from on to off. The switch can be a b-contact.

  In addition to the above embodiment, the reed switch can be configured such that the opposed reed switch is disposed on the opposite side of the reed switch with the first magnet and the second magnet interposed therebetween.

  In addition, a second reed switch is disposed adjacent to the reed switch in the magnet moving direction, and the first and second magnets are sandwiched between the two reed switches. It can be set as the embodiment by which two opposing side reed switches adjacent to the magnet moving direction are arranged on the opposite side.

  Next, a push button switch according to the present invention includes the reed switch control device described in the above-described invention or its embodiment.

  As an embodiment of the invention relating to the push button, the means for moving the first magnet and the second magnet may have a push button provided so as to be movable in and out of the casing.

  According to the present invention, the magnetic field strength acting on the reed switch, that is, the magnetizing force is greatly increased or decreased only by moving the two magnets over a very short distance, so that the reliability of the on / off operation of the reed switch is not impaired. Therefore, it is possible to reduce the thickness of the reed switch control device and the push button switch equipped with this control device.

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 reed switch of the 2nd embodiment of the present invention. The arrangement diagram of the magnet and reed switch of the 3rd embodiment of the present invention. The arrangement diagram of the magnet and reed switch of the 4th embodiment of the present invention. The characteristic view which shows the strength of the magnetizing force with respect to the reed switch of the magnet in the said 4th Embodiment. The arrangement diagram of the magnet and reed switch of the 5th embodiment of the present invention. The characteristic view which shows the strength of the magnetizing force with respect to the reed switch of the magnet of the said 5th Embodiment. 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 two magnets involved in opening and closing the reed switch 2 ( Permanent magnets) 4a and 4b.

  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 two magnets 4a and 4b are attached to the push button 3 so as to bite into the side facing the reed switch 2, and thus attached to the push button 3 in the axial direction of the push button 3. Therefore, the lead switch 2 moves in a direction orthogonal to the electrode axis. Of the two magnets 4a and 4b, the one located on the front side of the push button 3 is referred to as a first magnet 4a, and the one located on the rear side of the push button 3 is referred to as a second magnet 4b. Both magnets 4a and 4b 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.

  As shown in FIGS. 3 and 4, the electrode axis of the reed switch 2 is the X axis (in FIG. 4, the X axis is orthogonal to the drawing sheet), and the direction is orthogonal to the electrode axis of the reed switch 2. If the moving direction of the two magnets 4a and 4b is the Z-axis direction and the orthogonal axis perpendicular to both the X-axis and the Z-axis is the Y-axis, the first magnet 4a and the second magnet 4b are: At a position y on the Y-axis with respect to the reed switch 2, each magnetic pole axis (SN axis) is parallel to the Y-axis and is spaced apart in the Z-axis direction, and has opposite polarities. That is, the direction of the magnetic pole of the first magnet 4a and the direction of the magnetic pole of the second magnet 4b are opposite to each other. In this embodiment, the N pole of the first magnet 4a faces the reed switch 2 side, The south pole of the magnet 4b faces the reed switch 2 side.

  In the positional relationship between the first and second magnets 4a and 4b and the reed switch 2, when the push button 3 is not operated, the first magnet 4a and the second magnet 4b are shown by solid lines in FIG. As described above, the intermediate region between them is in a position close to the reed switch 2, and the first magnet 4 a is close to the reed switch 2 when the push button 3 is pushed in a predetermined stroke.

  In the above configuration, before the push button 3 is pushed in, the two magnets 4a and 4b are positioned before and after the reed switch 2, and the reed switch 2 faces an intermediate region between the two magnets 4a and 4b. As a result, when the first magnet 4a moves on the Z axis in the z-increasing direction as the push button 3 is pushed, the first magnet 4a is closest to the reed switch 2. , The magnetic field strength acting on the reed switch 2 changes suddenly, the reed switch 2 switches from off to on, and the reed switch 2 is turned on at the position where the first magnet 4a is closest to the reed switch 2. maintain.

  This operation will be described in detail with reference to FIGS. FIG. 5 shows the characteristics of the magnetic force acting on the reed switch 2 when the position of the first magnet 4a in the Z-axis direction is changed together with the second magnet 4b in the arrangement of FIG. The position of the magnet is z = 0 when the magnet 4a is closest to the reed switch 2, and z = −10 when the magnet 4b is closest to the reed switch 2. The magnetizing force exerted on the reed switch 2 is a combination of the magnetizing forces of each of the first magnet 4a and the second magnet 4b. In FIG. 5, the magnetizing forces of the magnets 4a and 4b are indicated by dotted lines. The resultant magnetizing force is indicated by a solid line.

  As shown in FIG. 5, the combined magnetizing force of the two magnets 4a and 4b changes more rapidly than the magnetizing force of the single magnet 4a (or 4b) between the two magnets 4a and 4b. When the magnet position is z = -3, the reed switch 2 is turned on. When z = -4, the reed switch 2 is turned off. Therefore, as shown in FIGS. 1 and 5, the reed switch 2 is reliably turned on and off by setting the position z = −6 to 0 as the stroke of the push button 3.

  As can be seen from the above operation, in the first embodiment, the first magnet 4 a is a magnet that mainly turns on the reed switch 2, and the second magnet 4 b has a steep magnetization force with respect to the reed switch 2. It is a magnet that gives various changes.

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

  In the second embodiment, if the same reed switch as that shown in the first embodiment is a first reed switch 2a, the magnet moving direction (Z-axis direction) of the first reed switch 2a is as follows. A second reed switch 2b is arranged adjacent to the side of the first side. The distance between the first reed switch 2a and the second reed switch 2b in the Z-axis direction is about one half of the distance between the two magnets 4a and 4b, and the movement of the two magnets 4a and 4b. Corresponds to the stroke.

  In a state where the moving means such as a push button is not operated, the first reed switch 2a faces the intermediate region between the two magnets 4a and 4b, and the received magnetizing force is 0, which is off. The second reed switch 2b is in a position closest to the second magnet 4b, and the magnetizing force received is the maximum value of S and is in the on state.

  Next, when the push button is pushed in, the first magnet 4a comes closest to the first reed switch 2a, and the second reed switch 2b faces the intermediate region between the two magnets 4a and 4b. Accordingly, the N magnetizing force of the first magnet 4a acting on the first reed switch 2a is the maximum, and the first reed switch 2a is turned on. On the other hand, the second reed switch 2b is turned off with no magnetizing force acting on it. That is, by operating the push button 3, the first reed switch 2a is switched from off to on, and the second reed switch 2b is switched from on to off. The first reed switch 2a has an a contact, and the second reed switch 2b has a b contact.

  In the second embodiment, the first magnet 4a is a magnet that turns on the first reed switch 2a, and the second magnet 4b is a magnet that imparts a change in magnetization force to the first reed switch 2a. For the second reed switch 2b, the second magnet 4b is a magnet for turning on the second reed switch 2b, and the first magnet 4a changes the magnetizing force to the second reed switch 2b. It is a magnet to be applied.

  In the arrangement shown in FIG. 6, the a-contact and the b-contact can be configured with a very short push button stroke, and the magnetizing force is 0 in the off position, so that the operation is reliable and the two reed switches 2a, 2b are both magnets. Since it is arranged on one side of 4a, 4b, there is a feature that it can be made compact.

[Third Embodiment]
FIG. 7 shows the positional relationship between the magnet and the reed switch in the third embodiment.

  In the third embodiment, as in the second embodiment, the first reed switch 2a and the second reed switch 2b are arranged adjacent to each other in the magnet moving direction, and the two Two opposing reed switches (third reed switch 2c and second reed switch 2c and 2b) adjacent to each other in the magnet moving direction on the opposite side of the first magnet 4a and the second magnet 4b with respect to the reed switches 2a and 2b. A fourth reed switch 2d) is arranged.

  The third reed switch 2c, which is the reed switch on the opposite side, is provided at the same Z-axis direction position as the first reed switch 2a, and the fourth reed switch 2d is the same Z as the second reed switch 2b. It is provided at an axial position.

  The magnetizing force acting on the third reed switch 2c and the fourth reed switch 2d is different from the magnetizing force acting on the first reed switch 2a and the second reed switch 21 only in the polarity of NS. The size is the same as that acting on the first reed switch 2a and the second reed switch 2b, and the on / off operation is also the same. Accordingly, the third reed switch 2c has an a contact and the fourth reed switch 2d has a b contact with respect to the push button.

  Since the four reed switches 2a, 2b, 2c, 2d are magnetized independently, they can be used independently or in any combination, and in addition to 2 a contacts + 2 b contacts, only 2 a contacts, Or many contact combinations, such as only two b contacts, can be configured.

[Fourth Embodiment]
FIG. 8 shows the positional relationship between the magnet and the reed switch in the fourth embodiment, and FIG. 9 shows the magnitude of the magnetizing force in the positional relationship between the magnet and the reed switch shown in FIG.

  In the first to third embodiments described above, the positions of the two magnets 4a and 4b in the Y-axis direction are set to be the same. However, in the fourth embodiment, the first magnet 4a and the first magnet 4a The positions of the two magnets 4b in the Y-axis direction are different. Specifically, the shortest distance between the first magnet 4a and the second magnet 4b with respect to the reed switch 2 is ya <yb, and the magnetizing force of the second magnet 4b with respect to the reed switch 2 is weak. .

  Looking at the characteristic example shown in FIG. 9, since the magnetization force of the second magnet 4 b is weak, the magnetization force of S is small and the combined magnetization force of the two magnets 4 a and 4 b acting on the reed switch 2. Does not reach the “on magnetization force” or “off magnetization force” on the S side. Therefore, even if the second magnet 4b moves in the Z-axis direction and approaches the reed switch 2, the reed switch 2 is not driven to turn on by the magnetizing force.

  When the push button is pushed, the reed switch 2 is turned on when the magnet position is z = -4, and the reed switch 2 is turned off at the position z = -5.5 when the first magnet 4a moves back. . Since the ON / OFF interval is sufficiently smaller than the conventional configuration, the stroke of the push button can be reduced, and the reed switch 2 is turned on again even if the push button moves a long distance in the Z-axis direction. Don't be.

[Fifth Embodiment]
FIG. 10 shows the positional relationship between the magnet and the reed switch in the fifth embodiment, and FIG. 11 shows the magnitude of the magnetizing force in the positional relationship between the magnet and the reed switch shown in FIG.

  In the fifth embodiment, as in the fourth embodiment, the positions of the first magnet 4a and the second magnet 4b along the Y-axis direction are different, and in the fourth embodiment. A reed switch similar to that shown in the figure is used as the first reed switch 2a, and the opposite side lead is sandwiched between the first reed switch 2a and the first magnet 4a and the second magnet 4b. A switch 2c is arranged. It is assumed that the shortest distance between the reed switch 2c on the opposite side and the second magnet 4b is equal to the shortest distance between the first reed switch 2a and the first magnet 4a.

  In FIG. 11, the magnetization force for the first reed switch 2a is the combined magnetization force of the first magnet 4a and the second magnet 4b, and the position z = 0 at which the first magnet 4a is closest to the reed switch 2a. It will be the best. The magnetization force for the reed switch 2c on the opposite side is opposite to that of the first reed switch 2a in terms of the position z, and the second magnet 4b is closest to the reed switch 2c at the position z = −10. Become the best.

  The position z of the magnet is changed by the moving means such as a push button. If the moving stroke is set to position z = −10 to 0, the reed switch on the opposite side is located at the position z = −10 of the magnet at the push button opening position. 2c is on, and the first reed switch 2a is off. When the value of the magnet position z is increased by pushing the push button, the opposing reed switch 2c is turned off at the magnet position z = −4.5, and the first lead at the magnet position z = −3.5. The switch 2a is turned on, and at the magnet position z = 0 when the push button is pushed, the first reed switch 2a is on and the reed switch 2c on the opposite side is off. When the push button is returned, the first reed switch 2a is turned off at the magnet position z = -5.5, and the opposite reed switch 2c is turned on at the magnet position z = -6.5. It reaches the button release position. As can be seen from the operation as described above, the first reed switch 2a operates as an a contact and the opposite reed switch 2c operates as a b contact, and an ab contact can be realized by both the reed switches 2a and 2c.

DESCRIPTION OF SYMBOLS 1 Casing 2 Reed switch 3 Push button 4a 1st magnet 4b 2nd magnet

Claims (7)

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 (X axis) with respect to the reed switch,
As the magnet, a first magnet whose magnetic pole axis is parallel to the electrode axis of the reed switch and an orthogonal axis (Y axis) orthogonal to the moving direction (Z axis direction) of the magnet, and the magnetic pole axis are the first magnet A magnetic pole having a polarity opposite to that of the first magnet, the first magnet and a second magnet arranged at an interval in the moving direction thereof, the first and second magnets; Is a reed switch control device that is movable in the moving direction while maintaining the interval and the direction of the magnetic poles. The reed switch control device according to claim 1,
The two magnets move between a position where one of them is close to the reed switch and a position where the magnetizing force decreases between the two magnets is close to the reed switch. A reed switch control device. The reed switch control device according to claim 1 or 2,
A reed switch control device, wherein the first magnet and the second magnet are moved in the Z-axis direction integrally with different positions along the Y-axis direction. The reed switch control device according to any one of claims 1 to 3,
A reed switch control device, wherein a second reed switch is arranged adjacent to the reed switch in the magnet moving direction. The reed switch control device according to any one of claims 1 to 3,
A reed switch control device, wherein an opposed reed switch is disposed on the opposite side of the reed switch between the first magnet and the second magnet. The reed switch control device according to any one of claims 1 to 3,
A second reed switch is disposed adjacent to the side of the reed switch in the direction of magnet movement, and on the opposite side of the two reed switches with the first magnet and the second magnet sandwiched therebetween. A reed switch control device comprising two opposing reed switches adjacent to each other in the magnet moving direction.   A push button switch comprising the reed switch control device according to claim 1.

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