JP2007087095A - Detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify assembly work in a manufacturing process and simplify mounting work and secure detection of the magnetic field of a magnetic field generation unit, by eliminating variation in the sensitivity of individual sensors in a detection device for detecting open and close using a magnetic field. <P>SOLUTION: The detection device includes a magnetic field generation unit for generating the magnetic field, which is mounted on one of the structure constituting an open and close structure, and a magnetic field detection unit mounted on the other structure constituting the open and close structure, having a sensor including at least a hall element for detecting the magnetic field, and for outputting a voltage based on the detected magnetic field intensity. In the detection device for detecting opening and closing of the open and close structure based on the variation of the magnetic field due to opening and closing of the structure constituting the open and close structure, a magnetic member magnetized by the magnetic field of the magnetic field generation unit is mounted on the sensor of the magnetic field detection unit. Further, the magnetic member is mounted and fixed, for example, on a circuit board having the hall element mounted thereon, so as not to produce a relative displacement to the hall element. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a detection device that detects opening / closing of an opening / closing structure including a combination of a door and a door frame, a window and a window frame, based on detection of a magnetic field.

  2. Description of the Related Art Conventionally, sensors using a magnetoelectric conversion element such as a reed switch that detects a magnetic field generated from a magnet, a magnetoresistive element, and a Hall element are known as terminals for monitoring the opening and closing of windows and doors. The opening / closing signals of the windows and doors by the magnetoelectric transducer are sent to the control device of the security system, and the opening / closing states of the doors and windows are collectively monitored on the control device side. (For example, see Patent Document 1)

  More specifically, as shown in FIG. 5, the detection apparatus M includes a magnetic field detection unit M1 that detects a magnetic field and a magnetic field generation unit M2 that generates a magnetic field. For example, as shown in FIGS. 8 and 9, the magnetic field detection unit M1 and the magnetic field generation unit M2 are often rectangular parallelepiped boxes.

  When the detection device M is applied to detect the opening / closing of a window, for example, as shown in FIGS. 8A and 8B, a magnetic field generation unit M2 is attached to the window (one structure) W1 to detect the magnetic field. The unit M1 is attached to the window frame (other structure) W2. When the detection device M is applied to detect the opening / closing of the door, for example, as shown in FIGS. 9A and 9B, the magnetic field generation unit M2 is attached to the door (one structure) D1, The magnetic field detection unit M1 is attached to the door frame (other structure) D2. Here, the window W1 and the window frame W2, and the door D1 and the door frame D2 constitute a pair to form an opening / closing structure.

  As shown in FIG. 5, the magnetic field detection unit M <b> 1 includes a signal processing / control unit 21, a transmission unit 22, a sensor 23, a storage unit 24, and a display unit 25. The storage unit (storage means) 24 includes, for example, an EEPROM capable of erasing and writing stored contents, a RAM that temporarily stores data, and the like, and stores various data necessary for the operation of the magnetic field detection unit M1. It is something to remember.

  The sensor 23 uses a Hall element here, and is usually provided in the form of an IC incorporating the Hall element. The Hall element is attached to the substrate of the magnetic field detection unit M1.

  The Hall element outputs a relatively low voltage when a magnetic field is detected while the power is on, and outputs a higher voltage than when a magnetic field is detected in other cases. It is supposed to be.

  When the Hall element is used as the magnetoelectric conversion element of the sensor 23 as described above, as shown in FIG. 6, the Hall element H is obtained when a magnetic field is applied perpendicularly to the sensing part surface from the outside. The potential difference is generated between the output terminals. That is, as shown in FIG. 7, when the sensor 23 or the magnet G of the magnetic field generation unit is not attached at a predetermined position, there is a possibility that the open / closed state of the window or door cannot be reliably detected. Therefore, it is necessary to determine the mounting position of the sensor equipped with the Hall element and the magnetic field generation unit to be an accurate predetermined position. When the magnetic field detection unit and the magnetic field generation unit are mounted, the skill of an expert is required or the position is accurately determined. There has been a problem that it is necessary to use an instrument for performing measurement, and a simple mounting operation cannot be performed.

  Therefore, in the invention disclosed in Patent Document 1, in order to solve this problem, a magnetic field can be detected at different positions by attaching a plurality of Hall elements to the magnetic field detection unit, or magnetic fields in different directions. Can be detected. In other words, the relative mounting position and mounting direction of the magnetic field detection unit and the magnetic field generation unit are provided with a degree of freedom so that the magnetic field of the magnetic field generation unit can be detected even if the relative positional relationship between the two is slightly deviated.

Japanese Patent Laid-Open No. 2003-223683 (FIGS. 5 and 6)

  However, in the invention disclosed in Patent Document 1, a plurality of Hall elements must be attached to the magnetic field detection unit in order to provide flexibility in the relative mounting direction and mounting position of the magnetic field detection unit and the magnetic field generation unit. Rather, the assembly work becomes complicated by this, and each Hall element also has a property that a potential difference is generated between the output terminals when a magnetic field is applied vertically to the sensitive part surface from the outside. In order to detect at an intermediate position between the hall elements, an arithmetic processing based on a signal obtained from the hall elements is required.

  An object of the present invention is to simplify a mounting operation without using a plurality of Hall elements in a detection device using a Hall element as a magnetoelectric conversion element, and to say, a relative positional relationship with a magnetic field generating unit is somewhat It is to ensure that the magnetic field can be detected even if it is deviated.

  In order to solve the above problems, the invention described in claim 1 is attached to one structure constituting the open / close structure, and is attached to the magnetic field generating unit for generating a magnetic field and the other structure constituting the open / close structure. A magnetic field detection unit having a sensor composed of a Hall element that detects a magnetic field and outputs a voltage based on the detected magnetic field strength, and changes in the magnetic field accompanying the opening and closing of the structure constituting the open / close structure In the detection device for detecting the opening / closing of the opening / closing structure, a magnetic member magnetized by the magnetic field generated from the magnetic field generation unit is attached to the sensor of the magnetic field detection unit.

  Here, specific examples of the structure constituting the opening / closing structure include a door and a door frame, a window and a window frame, a safe door and a main body, and two doors with double doors. One structure to which the magnetic field generation unit is attached and the other structure to which the magnetic field detection unit is attached may be configured such that one is fixed and the other is movable, or both are movable. It may be.

  According to a second aspect of the present invention, in the detection apparatus according to the first aspect of the present invention, the magnetic member is attached with a relative positional relationship with the Hall element fixed.

  According to a third aspect of the present invention, in the detection device according to the first or second aspect, the magnetic member is attached to a circuit board to which the Hall element is attached.

  According to the first aspect of the present invention, since the magnetic member is attached to the sensor of the magnetic field detection unit, it is possible to improve the sensor sensitivity and expand the detection range that cannot be obtained by using only the Hall element.

  According to the invention of claim 2 or 3, since the relative positional relationship with the Hall element is fixed and fixed, the magnetic member does not cause a relative deviation from the Hall element, In the manufacturing process, it is possible to eliminate variations in the sensitivity of each sensor by a simple assembly operation, and it is possible to more easily install the detection device at the time of field installation.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

  A magnetic member P is attached to a sensor 23 of a magnetic field detection unit, which is an embodiment of the detection apparatus of the present invention, as shown in FIGS. More specifically, the magnetic member P is made of a high magnetic permeability material having a small coercive force, in other words, a high magnetic permeability material that is difficult to be a magnet itself, for example, permalloy, and one end portion of the magnetic member P receives a Hall element H as a sensor. It is made to adjoin to the sensitive part surface, and the other end part is made to face a desired position away from the Hall element H.

  As described above, when the magnetic member P is attached in the proximity of the sensitive part surface of the Hall element H, the magnetic member P is magnetized only by the magnet G of the magnetic field generating unit approaching the magnetic member P, and both end portions thereof are magnetized. Generates a magnetic field that takes the Then, the magnetic field generated at one end of the magnetic member P close to the sensitive part surface of the Hall element H acts perpendicularly to the sensitive part surface of the Hall element H, and a potential difference is generated between its output terminals. . In this case, one end portion of the magnetic member P located close to the sensitive part surface of the Hall element H is set to a position where the magnetic field generated therefrom acts perpendicularly to the sensitive part surface of the Hall element H.

  Thus, the magnet G of the magnetic field generating unit does not necessarily have to come to a position where the magnetic field acts perpendicularly to the sensitive surface of the Hall element H, but only needs to come to a position where the magnetic member P can be magnetized. This results in an improvement in sensor sensitivity and an increase in detection range that could not be obtained with the Hall element alone.

  If the magnetic member is simply provided close to the sensing part surface of the Hall element H, not only does the magnetic field detection unit manufactured have a relative deviation from the Hall element, but also, for example, the magnetic member P Even if one end portion of the magnetic field generator is placed on the Hall element H, an inclination is generated between the other end portion which is a free end and a unique distance from the magnet G of the magnetic field generating unit can be determined. In other words, the sensitivity varies among products.

  Therefore, in the present invention, the magnetic member P is attached and fixed to the circuit board B to which the Hall element H is attached so that the magnetic member can be attached with the relative positional relationship with the Hall element fixed. This prevents variations in sensitivity between products.

  More specifically, as shown in FIGS. 3 and 4, the magnetic member P is processed into a shape that can be attached and fixed to the circuit board B from a high permeability material having a small coercive force, for example, a strip-shaped plate made of permalloy. Get. That is, the strip-shaped magnetic member P is flat without any processing so that one end P1 thereof can be placed on the sensing part surface of the Hall element H, but the other end has three in the longitudinal direction. After being divided into two, it is bent in two steps. The first-stage folding position P2 is on an undivided plane portion, and the second-stage folding position P3 is a division position divided into three from the plane portion.

  Here, the bending angle at the first stage defines the inclination angle of the magnetic member P. The outer two outer side P4 and P5 divided into three parts by the second stage bending are soldered and fixed through a hole made in the circuit board B to which the Hall element H is attached. The remaining central one P6 is bent along the surface of the circuit board B and comes into contact with the surface of the circuit board B. Thus, the lengths of the two outer sides P4 and P5 inserted into the circuit board B are defined, and as a result, the inclination angle of the magnetic member P is defined.

  To attach the magnetic member P processed as described above to the circuit board B, as shown in FIG. 4, one end P1 is mounted on the circuit board B and comes into contact with the sensing part surface of the Hall element H. Then, the two outer sides P4 and P5 divided at the other end are passed through the holes formed in the circuit board B, and the remaining one center P6 is brought into contact with the surface of the circuit board B. The P4 and P5 are soldered to the circuit board B with solder S and fixed.

  Thus, since the magnetic member P is attached and fixed to the circuit board B to which the Hall element H is attached, there is no deviation in the relative positional relationship with the Hall element, and the manufacturing process is simple. As a result of the simple assembling work, variations in the sensitivity of the individual sensors can be eliminated, and the installation work of the detection device can be carried out more easily during field installation.

  In the above embodiment, the other end of the magnetic member P is divided into three parts in the longitudinal direction and then bent in two steps. In short, in order not to cause a relative deviation from the Hall element, Since it is only necessary that the Hall element H can be attached and fixed to the circuit board B to which the Hall element H is attached, the present invention is not limited to this form. For example, the other end portion may be soldered on the same surface of the circuit board B on which the Hall element H is mounted without penetrating the hole formed in the circuit board B.

It is a block diagram of the sensor in the magnetic field detection unit which is this embodiment. It is a figure explaining the principle of operation of the sensor in the magnetic field detection unit which is an example of this embodiment. It is a perspective view of the magnetic member of the sensor in the magnetic field detection unit which is this embodiment. It is a side view in the assembly state of the sensor in the magnetic field detection unit which is this embodiment. 2 is a block diagram illustrating a configuration of a detection device M. FIG. It is a figure explaining the operation principle of the sensor in the conventional magnetic field detection unit. It is a figure explaining the operation principle of the sensor in the conventional magnetic field detection unit. (A), (b) is a figure which shows the example which applied the detection apparatus to the opening / closing detection of a window. (A), (b) is a figure which shows the example which applied the detection apparatus to the opening / closing detection of a door.

Explanation of symbols

M detection device M1 magnetic field detection unit M2 magnetic field generation unit W1 window (one structure)
W2 Window frame (other structures)
23 Sensor B Circuit board H Hall element G Magnet P Magnetic member

Claims (3)

A magnetic field generating unit that is attached to one structure constituting the open / close structure and generates a magnetic field, and is attached to the other structure constituting the open / close structure, detects at least the magnetic field, and the detected magnetic field And a magnetic field detection unit having a sensor composed of a Hall element that outputs a voltage based on intensity, and detecting the opening / closing of the opening / closing structure based on a change in the magnetic field accompanying the opening / closing of the structure constituting the opening / closing structure In the device
A detection device, wherein a magnetic member magnetized by a magnetic field generated from the magnetic field generation unit is attached to the sensor of the magnetic field detection unit.   The detection device according to claim 1, wherein the magnetic member is attached with a relative positional relationship with the Hall element fixed. The detection device according to claim 1, wherein the magnetic member is attached to a circuit board to which the Hall element is attached.

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