JP2569543Y2 - Door suction holding and opening / closing confirmation device - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a door chuck having a function as a magnet catch for holding a door of a case, a cabinet or furniture by magnetic force and a function of detecting opening and closing of the door. The present invention relates to a holding and opening / closing confirmation device.

[0002]

2. Description of the Related Art Conventionally, in a magnet catch for attracting and holding a door by magnetic force, a door catching mechanism proposed by the present applicant in Japanese Utility Model Publication No. 4-9836 has been proposed which has a function of detecting the open / closed state of the door. Holding and opening / closing confirmation devices are known.

FIGS. 4 and 5 show the configuration of Japanese Utility Model Publication No. 4-9836, wherein FIG. 4 shows a state in which the door is closed, and FIG. 5 shows a state in which the door is open. In these figures, yoke pieces 2 made of iron or the like are arranged on both end faces of a permanent magnet 1 having magnetic poles formed on both end faces. The N pole side yoke piece 2, the permanent magnet 1, and the S pole side yoke piece 2 are fixed to each other by a non-magnetic case 3 made of resin or the like. A Hall IC 15 (an integrated circuit of a Hall element and an electronic circuit for amplifying the output of the Hall element) is disposed in a space inside the case on the rear end face 9 side of each yoke piece 2.

On the other hand, an armature piece 7 is fixed to the door 6 side, and the armature piece 7 is attached to the yoke piece 2.
The door 6 is in a closed state (FIG. 4) when attracted and held on the front end face of the yoke piece 2 by a magnetic force, and the open state of the door 6 when the armature piece 7 is separated from the front end face of the yoke piece 2 by an external force.
(FIG. 5).

[0005] The conventional door suction holding and opening / closing confirmation device includes a state in which an armature piece 7 as a door-side magnetic body is suctioned to a part of a magnetic circuit having a permanent magnet 1 and a yoke piece 2 and a state in which the armature piece 7 is detached. Pays attention to the change in the magnetic flux of the magnetic circuit, and detects the change in the magnetic flux using the Hall IC 15.

In this case, the change in the magnetic flux passing through the Hall IC 15 changes within the same polarity (in this case, N
Pole), the magnetic flux density increases and decreases, and when the armature piece 7 is attracted
The magnetic flux density is greater when the armature piece 7 is detached (door open) than when the armature piece 7 is closed (door closed). Therefore, the Hall IC used here
15 is turned on in accordance with the increase or decrease of the magnetic flux density passing through the element.
This is called a unipolar type that turns off, and has characteristics as shown in FIG.

FIG. 6 shows the relationship between the change in magnetic flux density penetrating through the unipole type Hall IC 15 and the output voltage of the Hall IC 15. This figure shows that when the magnetic flux density is equal to or higher than Bon, the Hall IC 15 operates and the output voltage becomes high level, and when the magnetic flux density becomes equal to or lower than Boff, the output voltage of the Hall IC 15 becomes low level. Therefore, in order for the Hall IC 15 to switch in response to the opening and closing of the door 6, the Hall IC 1 associated with the opening and closing of the door 6
5, the magnetic flux density when the armature piece 7 is detached (the door is open) is Bon or more, and the armature piece 7
Is set so that the magnetic flux density at the time of adsorption (door closed) becomes Boff or less. With this configuration, when the door 6 is opened, the Hall IC 15 operates to output a high-level voltage, and when the door 6 is closed, the Hall IC 15 operates so that the voltage of the Hall IC 15 becomes low. A switching operation responsive to opening and closing of the door 6 is obtained.

[0008]

In the above-mentioned prior art, the change in magnetic flux of the magnetic circuit due to the opening and closing of the door is an increase or decrease in the magnetic flux density with the same polarity. Therefore, the magnetoelectric conversion element detects the change in the magnetic flux density. As a unipolar Hall IC1
5, the unipolar Hall IC has a characteristic that the switching operation is performed according to the magnitude of the magnetic flux density at the same polarity as shown in FIG. However, a unipolar element having appropriate characteristics that reliably performs a switching operation in response to a change in magnetic flux density due to opening and closing of the door 6 has a problem that it is difficult to obtain and is expensive. Further, in order to reliably perform the switching operation, a magnetic circuit including the armature piece 7 of the door 6, the permanent magnet 1, and the pair of yoke pieces 2 so that a change in magnetic flux density according to the switching characteristics of the Hall IC 15 can be obtained. Must be designed. For that purpose, it is necessary to sufficiently consider the strength of the magnetic pole in selecting the permanent magnet 1. In addition, in the case of mass production, there is a problem that, due to variations in the characteristics of the permanent magnet 1 and the Hall IC 15, products that do not operate reliably or products with low operation reliability are generated.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a door suction holding and opening / closing confirmation device which can use an inexpensive magnetoelectric element, reliably detects opening / closing of a door, and has high reliability. .

[0010]

In order to achieve the above object, a door suction holding and opening / closing confirmation device according to the present invention comprises a first permanent magnet having magnetic poles formed at both end faces and the first permanent magnet having the first and second permanent magnets. A magnetic circuit having a pair of yoke pieces arranged and integrated on both end faces, and detecting a change in magnetic flux between the yoke pieces corresponding to the attraction and desorption of the door-side magnetic body with respect to the paired yoke pieces. As described above, a configuration is provided that includes a magnetoelectric conversion element arranged at a fixed position and a second permanent magnet arranged at a fixed positional relationship with the magnetoelectric conversion element.

[0011]

The present invention focuses on the fact that the magnetic flux of the magnetic circuit changes between a state in which the door-side magnetic body is adsorbed on a part of the magnetic circuit having the first permanent magnet and the yoke and a state in which the door-side magnetic body is released. Detecting the change in the magnetic flux using a Hall element, a Hall IC (an integrated circuit of a Hall element and an electronic circuit for amplifying the output of the Hall element), a magnetoresistive element, an SMD, etc. The second permanent magnet is arranged in a fixed positional relationship with the conversion element. Thereby, in the combined magnetic flux of the magnetic circuit and the magnetic flux of the second permanent magnet passing through the magnetoelectric conversion element, the direction of the magnetic flux is reversed with the attraction and detachment of the door-side magnetic body by opening and closing the door. .
The change in the direction of the magnetic flux is detected by a magnetoelectric conversion element, and the output indicates whether the door is closed or open. In this case, the magnetoelectric conversion element only needs to detect the reversal of the magnetic flux, and the detection operation is highly reliable.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a door suction holding and opening / closing confirmation device according to the present invention.

FIGS. 1 and 2 show an embodiment of the present invention.
1 shows a state in which the door is closed, and FIG. 2 shows a state in which the door is open.
In these figures, yoke pieces 2 made of iron or the like are arranged in pairs at both end surfaces of a first permanent magnet 1 having magnetic poles formed at both end surfaces. The N pole side yoke piece 2, the first permanent magnet 1, and the S pole side yoke piece 2 are tightly fixed to each other by a non-magnetic case 3 made of resin or the like. A bottom cover 8 is fixed to a case opening on the rear end surface 9 side of each yoke piece 2, and a bipolar Hall IC 5 as a magnetoelectric conversion element is fixed to the bottom cover 8 and formed on the bottom cover 8. The second permanent magnet 4 is fixed to the held holding portion 8a, and the bipolar Hall IC 5 and the second permanent magnet 4 are respectively arranged in the case internal space. Here, Hall IC5
Is an integrated circuit of a Hall element and an electronic circuit for amplifying the output of the Hall element. The Hall element is arranged so that the magnetic flux from the yoke piece 2 passes through the Hall element perpendicularly to the current direction in the built-in Hall element. I do. Also, the second permanent magnet 4
Have magnetic poles on the left and right end faces, and a magnetic flux substantially parallel and opposite in direction to the magnetic flux from the rear end face 9 of the yoke piece 2
It is arranged at a fixed position so as to pass through C5.

On the other hand, an armature piece 7 is fixed to the door 6 side, and the armature piece 7 is attached to the yoke piece 2.
When the armature piece 7 is detached from the front end face of the yoke piece 2 by an external force, the door 6 is opened.

The strength of the magnetic pole of the second permanent magnet 4 is determined by the magnetic force of the first permanent magnet 1 when the armature piece 7 is attracted to the front end face of the yoke piece 2. It is set so that a magnetic field larger than the magnetic field generated between the pieces 2 can be generated in the opposite direction. However, armature piece 7
Is weaker than the magnetic field between the yoke pieces 2 when the second permanent magnet 4 is separated from the front end face of the yoke piece 2.

In the configuration in which the second permanent magnet 4 is added to the magnetic circuit composed of the first permanent magnet 1 and the yoke piece 2, the magnetic field is reversed according to the attraction and detachment of the armature piece 7. When the armature piece 7 is attracted (the door is closed) in FIG. 1, most of the magnetic flux from the first permanent magnet 1
Since the magnetic field passes through the armature piece 7 on the front end face side, the magnetic field penetrating the Hall IC 5 disposed on the rear end face 9 side of the yoke piece 2 is more second than the magnetic field from the yoke piece 2 by the first permanent magnet 1. Since the magnetic field from the permanent magnet 4 is stronger, the Hall IC 5 is affected by the magnetic flux in the direction of the arrow X. FIG.
When the armature piece 7 is detached (the door is open), the magnetic field from the rear end face 9 of the yoke piece 2 by the first permanent magnet 1 becomes stronger than the magnetic field from the second permanent magnet.
Is affected by the magnetic flux in the direction of arrow Y from the yoke piece 2 by the first permanent magnet. Therefore, the direction of the magnetic flux passing through the bipolar Hall IC 5 is reversed according to the opening and closing of the door 6.

By the way, the bipolar Hall IC 5
Has a function of turning on and off according to the polarity of the magnetic flux penetrating the built-in Hall element, and has characteristics as shown in FIG. FIG. 3 shows the Hall IC 5 with respect to the change in the magnetic flux density and the polarity (direction) of the magnetic flux passing through the bipolar Hall IC 5.
1 shows the relationship between the output voltages. In this figure, when the polarity (direction) of the magnetic flux is on the N-pole side and the magnetic flux density is equal to or higher than Bon, the Hall IC 5 operates and the output voltage becomes a high level. This indicates that the output voltage of the Hall IC 5 becomes low level when the voltage becomes Boff or more. Therefore, in order for the Hall IC 5 to switch in response to the opening and closing of the door 6, the Hall IC 5 associated with the opening and closing of the door 6
In the change of the magnetic flux density and the polarity of the magnetic flux passing through 5,
When the armature piece 7 is detached (the door is open), the direction of the combined magnetic field of the magnetic field of the first permanent magnet 1 and the yoke piece 2 and the magnetic field of the second permanent magnet 4 is in the direction of the arrow Y (polarity N). When the magnetic flux density becomes Bon or more and the armature piece 7 is attracted (the door is closed), the direction of the combined magnetic field of the magnetic field by the first permanent magnet 1 and the yoke piece 2 and the magnetic field of the second permanent magnet 4 becomes Arrow X direction
(Polarity S) is set so that the magnetic flux density becomes Boff or more. With this configuration, the Hall IC 5 operates with the door 6 opened, and outputs a high-level voltage.
Is closed so that the voltage of the Hall IC 5 becomes low level, and a switching operation in response to opening and closing of the door 6 is obtained.

The switching operation in response to the opening and closing of the door 6 is performed by mounting the Hall IC 5 in the opposite direction (inverted) so that the output of the Hall IC 5 is at a high level with the door 6 closed and the door 6 is opened. Thus, the output of the Hall IC 5 can be set to a low level, and it is easy to invert the switching operation.

In the above embodiment, the Hall IC 5 is disposed so as to face the rear end face 9 of the yoke piece 2. However, if the magnetic flux change corresponding to the attraction and detachment of the armature piece 7 can be detected. For example, the Hall IC 5 is arranged at a position facing the side end surface of the yoke piece 2, or the Hall IC 5 is arranged at a position facing the wide side surface of the yoke piece 2, and the second permanent magnet 4 is It may be arranged in a fixed positional relationship with respect to the Hall IC 5.

In addition, instead of the bipolar type Hall IC, an electronic circuit may be separately provided using a Hall element. Furthermore, a magneto-electric conversion element such as a magneto-resistance effect element or an SMD can be used.

Further, as an application example of the present invention, an alarm device for alarming the opening of the door with a buzzer sound can be configured by combining the door suction holding and opening / closing confirmation device of the present invention with a battery and a buzzer.

[0022]

As described above, according to the door suction holding and opening / closing confirmation device of the present invention, the magnetic circuit having the first permanent magnet and the yoke is provided, and the magnetic flux of the magnetic circuit accompanying the opening and closing of the door is provided. By arranging the second permanent magnet in a fixed positional relationship with respect to the magnetoelectric conversion element for detecting a change, the direction of the magnetic flux passing through the magnetoelectric conversion element is reversed according to the opening and closing of the door. Therefore, as a magnetoelectric conversion element used to detect a change in magnetic flux accompanying opening and closing of the door, a bipolar type hole I
An element of a type that detects a change in the direction of the magnetic flux such as C can be used. Since this bipolar element can be reliably operated by reversing the magnetic field, it operates more reliably and has higher reliability than a device using a conventional unipolar element, and is inexpensive because it is mass-produced. . Therefore, the door can be attracted and held by magnetic force, and the open / closed state of the door can be reliably detected, so that the reliability is improved as compared with the conventional structure. Further, since an inexpensive bipolar element can be used, the cost can be reduced and the price is also advantageous.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a door suction holding and opening / closing confirmation device according to the present invention, showing a closed state of a door.

FIG. 2 is a front view showing a state where the door is opened.

FIG. 3 is a graph showing a relationship between a magnetic flux density and an output voltage in a bipolar Hall IC.

FIG. 4 is a front view of a conventional example of a door suction holding / opening / closing confirmation device, showing a closed state of a door.

FIG. 5 is a front view showing a state where the door is opened.

FIG. 6 is a graph showing a relationship between a magnetic flux density and an output voltage in a unipolar Hall IC.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st permanent magnet 2 Yoke piece 3 Non-magnetic case 4 2nd permanent magnet 5 Hall IC 6 Door 7 Armature piece 8 Bottom lid

Continuation of the front page (72) Inventor Shigeo Saito 1-13-1 Nihonbashi, Chuo-ku, Tokyo Inside TDK Corporation (56) Reference Jikgyo 4-9836 (JP, Y2)

Claims (1)

(57) [Scope of request for utility model registration] A first permanent magnet having magnetic poles formed on both end faces thereof, and a pair of first permanent magnets arranged on both end faces of the first permanent magnet;
A magnetic circuit having an integrated yoke piece, and a magnetic circuit arranged at a fixed position so as to detect a change in magnetic flux between the yoke pieces corresponding to the attraction and desorption of the door-side magnetic body with respect to the paired yoke pieces. A door suction holding / opening / closing confirmation device, comprising: a conversion element; and a second permanent magnet arranged in a fixed positional relationship with respect to the magnetoelectric conversion element.