KR20040014087A - Displacement Detection Device - Google Patents

Abstract

PURPOSE: A displacement sensor is provided to sense the displacement of an object exactly. CONSTITUTION: The displacement sensor contains: a holder(10) fixed to a door frame; a hinge(20) installed on one side of the holder(10) and provided with a rotation sensor for checking whether the sensor body rotates on the hinge and detecting the degree of a revolving angle; and a sensor body(30) coupled to the holder(10) using a hinge(20) and rotated on the hinge(20) and provided with a lead switch for sensing the contact state of a set plate.

Description

Displacement Detection Device

The present invention relates to a lock device, and more particularly, to a device for detecting a displacement or inclination of an object such as a door.

In financial institutions, such as banks, or in institutions or companies that handle confidential documents, it is common to keep money or documents in safes. In addition, many of these safes employ an opening / closing detection device to monitor whether a third party or a person in charge of the safe opens the safe and tears the contents. 1 shows an example of a safe provided with a conventional open / close detection device. In the example shown, the device body 4 is provided on the side of the safe 2 and the device body 4 is connected to the device body 4 by means of a high strength cable 6 with a patch 8 having a close contact magnet and a reed switch. It is. On the other hand, a metal plate 2b is attached to the front of the safe door 2a.

After the shift is over and the back cover device (not shown) is locked with money or other securities or documents in the safe, the patch 8 of the open / close detection device is attached to the metal plate 2b of the door 2a. From this moment, the state of the open / close detection device is reported to the monitoring device of the external security service company. Thus, even if the third party or the safe officer releases the lock to open the safe without permission, the cable 6 prevents the door 2a from opening. If the patch 8 is detached from the metal plate 2b of the door 2a to open the door 2a, the reed switch detects this and informs the apparatus main body 4, and the apparatus main body 4 again guards it. The monitoring device of the service company will be notified.

However, such a conventional opening and closing detection device may not be able to exert its function. As an example, the safe officer may attach the patch 8 to a separate metal plate instead of attaching the patch 8 to the metal plate 2b of the door 2a after locking, as if the open / close detection device is operating normally on the monitoring device of the security service company. You can then open the safe. In another aspect, the conventional opening and closing detection device is limited to the use, it is limited to use only in the safe, etc. There is a disadvantage that it is difficult to install in terms of functionality and aesthetics to other types of doors or objects requiring displacement detection.

The present invention is to solve the above problems, it is possible to accurately detect the displacement of the object and to reduce the possibility of avoidance by the wrong method, to provide a displacement sensing device that can be applied to various kinds and types of objects Let it be technical problem.

1 is a view showing an example of a safe in which a conventional door open / close detection device is installed.

Figure 2 is a perspective view of one embodiment of a displacement sensing device according to the present invention.

3 is a perspective view of one embodiment of a rotation angle sensor.

4 is a block diagram showing an electrical configuration of the displacement sensing device of FIG.

5a to 5c show examples of forms in which a displacement sensing device may be installed to operate in a normal monitoring mode.

6a to 6c show installation examples for the respective examples of FIGS. 5a to 5c.

7 is a state transition diagram for the displacement sensing device.

8 is a flowchart showing a first operation example of a displacement sensing device.

9 is a timing diagram for a first operation example.

10 is a timing chart of a second operation example of the displacement sensing device.

11 is a timing chart of a third operation example of the displacement sensing device.

<Description of Symbols for Major Parts of Drawings>

10: holder 12: storage

14: groove 20: hinge

30: sensor body 32: engaging projection

34: push button 36: contact magnet

38: LED 39: Mode Selection Switch

52: vibration sensor 54: reed switch

56: rotation angle sensor

Displacement sensing device of the present invention for achieving the above technical problem is installed with any one of the object and the object installation surface as a fixed surface, the contact and contact with the set plate is installed on the other one of the object and the object installation surface Detect the displacement of the object by detecting the departure. Displacement sensing device is a holder which is installed to be fixed to the fixed surface; A hinge provided on one side of the holder; And a sensor body coupled to the holder through the hinge and rotatable about the hinge. The sensor body has a reed switch for sensing contact with the set plate, and the hinge has a rotation angle sensor therein for detecting whether the sensor body is rotatable about the hinge and the rotation angle size.

The determination means determines whether the object moves based on whether the sensor body and the set plate are in contact, whether the sensor body is rotated, and the rotation angle.

The displacement sensing device may further include a vibration sensor for detecting vibration due to an impact applied from the outside. In this case, the determining unit may detect whether the sensor body and the set plate are in contact, whether the sensor body is rotated, and the rotation angle and vibration detection. Based on whether or not the object moves.

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

2 shows an embodiment of a displacement sensing device according to the present invention. The illustrated displacement sensing device includes a holder 10 fixed to a door frame, and a sensor body 30 coupled to the holder 10 through a hinge 20 and rotatable about the hinge 20. . As will be described later, the holder 10 may be installed so that its bottom is firmly supported by the door frame. In this case, the sensor body 30 rotates around the hinge 20 in the state in which the door is locked. It may be in close contact with the magnetic plate (hereinafter referred to as "set plate") provided in the sensor body 30, in this state to perform a function for detecting whether the door is open.

The holder 10 is formed with a rectangular accommodating part 12 for accommodating the sensor body 30, and the engaging protrusion 32 of the sensor body 30, which will be described later, on both sides or one side of the inner circumferential surface of the accommodating part 12. ), A recess 14 is formed to allow the sensor body 30 to be seated therein. The magnet 16 is built in the position corresponding to the reed switch 54 below the bottom of the accommodating part 12.

A locking protrusion 32 is formed on the side surface of the sensor body 30 in correspondence with the recess 14 of the holder 10, and the locking protrusion 32 is integrally formed with the push button 34. When no external force is applied, the locking protrusion 32 and the push button 34 remain partially protruded outward by the action of an internal return spring (not shown), and the user pushes the push button 34 with a finger. When it presses, it can be pushed inward. Therefore, when the sensor body 30 is accommodated in the holder 10, the locking protrusion 32 is inserted into the recess 14 of the holder 10 to maintain a seated state, and the user push button 34. After pressing, the sensor body 30 can be pulled out of the holder 10 by pulling the sensor body 30. On the other hand, on the outside of the sensor body 30 (that is, the upper side in the figure), a close contact magnet 36 is provided for bringing the sensor body 30 into close contact with the set plate. On the other hand, the sensor body 30 is provided with a light emitting diode (LED) 38 for indicating an operation state and a mode selection switch 39 for selecting an operation mode, the mode selection switch 39 being located in a minute hole. It is preferable to arrange | position so that it can press using a sharp needle etc.

In the present embodiment, the displacement sensor is provided with three sensors, that is, a vibration sensor 52, a reed switch 54 and a rotation angle sensor 56. The vibration sensor 52 is a vibration applied to the displacement sensing device in a state where the sensor body 30 is set to be in close contact with the set plate, for example, an external force applied to separate the sensor body 30 from the set plate, and destroying the device. Impacts and attempts to dismantle the device by means of a welder or the like. The reed switch 54 is operated by the magnet of the holder 10 and the magnetic field of the set plate, and detects whether the sensor body 30 is in the seated state in the holder 10 or in close contact with the set plate. The rotation angle sensor 56 is installed in the hinge 30 and senses an angle (hereinafter, referred to as a rotation angle) and a rotation direction in which the sensor body 30 is unfolded from the holder 10.

3 shows one embodiment of a rotation angle sensor 56. In this embodiment, the rotation angle sensor 56 includes an encoder wheel 72, an LED 74, and two photodiodes 76a and 76b. The encoder wheel 72 has a substantially disc shape and is formed by passing through a plurality of slits in the radial direction, and is disposed so that its center is the same as the axis center of the hinge 30. The LED 74 and the photodiodes 76a and 76b are provided to face each other with the encoder wheel 72 interposed therebetween. The photodiodes 76a and 76b receive the light emitted from the LED 74 and convert it into an electrical signal. Accordingly, when the hinge 30 rotates, the photodiodes 76a and 76b generate a pulse string and output the pulse string to the signal processing printed circuit board. The signal processing printed circuit board determines the rotation angle and rotation direction of the sensor body 20 based on the number of pulses in the pulse trains from the photodiodes 76a and 76b and the timing of the two pulse trains. In one embodiment, 30 slits are formed in the encoder wheel 72, such that the rotation angle sensor 56 has a rotation angle resolution of 6 ° (= 360 / (30 * 2)).

4 illustrates an electrical configuration of the displacement sensing apparatus of FIG. 2. As shown, the displacement sensing device, in addition to the LED 38, the mode selection switch 39, the vibration sensor 52, the reed switch 54, the rotation angle sensor 56 described above, the control unit 80, EEPROM 82 ) And a relay 84. The controller 80 may be implemented using a conventional microcontroller, or may be implemented using an embedded CPU in which an analog / digital converter and a memory are embedded together with the CPU. The control unit 80 performs the operation of the designated mode through the mode selection switch 39, and in particular, a state indicating an alarm on the basis of signals from the vibration sensor 52, the reed switch 54 and the rotation angle sensor 56. Output the signal. The EEPROM 82 stores various setting values for the displacement sensing device and program codes for driving the controller 80. The relay 84 is turned on or off according to the state signal to transmit the corresponding output voltage to the monitoring device of the external security service company. Most of the components shown in FIG. 4 may be mounted on a printed circuit board installed inside the sensor body 30 or the holder 10 of the displacement sensing device.

2 may be installed and operated in various types of doors or structures. 5A to 5C show examples of an armed configuration in which a displacement sensing device is installed to operate in a normal monitoring mode, and FIGS. 6A to 6C show examples of installation of each of FIGS. 5A to 5C. Shows. As shown in FIGS. 5A and 6A, the sensor body 30 may perform a sensing function in a 180 ° deployment from the holder 10, and the displacement sensing device may be a door frame or a door frame. It can be installed in this way for the door. As shown in FIGS. 5B and 6B, the sensor body 30 may perform a sensing function in a 90 ° deployment from the holder 10, wherein the displacement sensing device may have no width of the door frame on the same plane. It can be installed in this way for the door. In addition, as shown in FIGS. 5C and 6C, the sensor body 30 may perform a sensing function in a state deployed 270 ° from the holder 10, such as in a structure such as a safe. Can be. On the other hand, it can of course be deployed to operate at other angles other than 90 °, 180 °, 270 °.

Hereinafter, the operation of the displacement sensing device of FIG. 2 will be described with the application example of monitoring opening and closing of the safe door.

7 is a state transition diagram showing a change in an operation mode of a displacement sensing device. The displacement sensing device has three operation modes, namely, the normal mode 100, the setting mode 102, and the test mode 104. When the power is newly applied, the displacement sensing device enters and operates in the normal mode 100. In the normal mode 100, the displacement sensing device monitors or dismounts whether or not the safe door is detached from the safe or opened based on the monitoring result of the vibration sensor 52, the reed switch 54, and the rotation angle sensor 56. Wait in the state (i.e., the state where the sensor body is seated in the holder). The setting mode 102 and the test mode 104 may be entered by user manipulation.

In the normal mode 100, when the sensor body 30 is seated on the holder 10 and the mode selection switch 39 is continuously pressed for 10 seconds, the displacement sensing device enters the setting mode 102. In the setting mode 102, the user can set and store the installation angle for monitoring. In the setting mode 102, the LED 38 flashes green. In this state, the sensor body 30 is pulled out of the holder 10, rotated by a desired angle, and fixed to the set plate, and the setting mode 102 ends. The deployment angle at this time is stored as the set monitoring angle (hereinafter referred to as 'setting angle'). When the mode selection switch 39 is pressed or the predetermined time (for example, 5 minutes) has elapsed in the setting mode 102, the operation mode returns to the normal mode 100. In one embodiment, the displacement sensing device performs a monitoring function only in a state in which the sensor body 30 is deployed at a set angle (or a range within a certain error therefrom) in the normal mode 100, and at an angle equal to or less than the set angle. In the deployed state it will wait.

In the normal mode 100, when the sensor body 30 is seated on the holder 10 and the mode selection switch 39 is continuously pressed for 5 seconds, the displacement sensing device enters the test mode 104. In test mode 104 the user can test the current set angle. While the sensor body 30 is seated on the holder 10 in the test mode 104, the LED 38 lights up in green, but when the sensor body 30 is drawn out of the holder 10 and starts to rotate, the LED ( 38) lights up in red, and when the present angle becomes larger than the set angle, the LED 38 flashes green, and when the present angle reaches the state where the sensor body 30 is in close contact with the set plate at an angle greater than the set angle, Since the LED 38 lights green, the user can confirm the set angle. When the mode selection switch 39 is pressed in the test mode 104 or when a predetermined time (for example, 5 minutes) elapses, the operation mode returns to the normal mode 100.

In the normal mode 100, the controller 80 determines whether to output an alarm based on signals from the vibration sensor 52, the reed switch 54, and the rotation angle sensor 56 according to a predetermined algorithm or rule. Below are some examples of these rules.

First operation example

In this example, the controller 80 does not output the alarm only when the sensor body 30 is in close contact with the set plate while maintaining the rotation angle within the set angle error range in the normal mode 100 and at the same time there is no vibration. . When the reed switch 54 does not detect a magnetic field and is turned off, the rotation angle is smaller than the set angle, or a vibration is detected, an alarm output is always performed.

8 is a flowchart showing such an operation example. In the state of outputting the alarm (step 200), the controller 80 determines whether the reed switch 54 is turned on (step 202). If the reed switch 54 is not turned on, the reed flag REED_FLAG indicating this is set to "1" (step 204). In this case, since the sensor body 30 is positioned between the set plate close contact state and the holder 10 seated state, the controller 80 maintains an alarm output (step 206), and then returns to step 202. The return is continued to monitor the status of the reed switch 54.

If it is determined in step 202 that the reed switch 54 is turned on, the state of the reed switch 54 is checked by checking the state of the previous reed switch 54 with the value of the reed flag REED_FLAG. (Step 208).

If the read flag (REED_FLAG) value is "0" to indicate that the reed switch 54 has been turned on before, the current angle and the set angle are compared in step 210. If it is determined in step 210 that the current angle is smaller than the set angle, the alarm output is maintained because the current angle is not satisfied (step 212). On the other hand, if the current angle is greater than the set angle in step 210, it is checked whether the vibration sensor 52 is turned on (step 214). If the vibration sensor 52 is turned on to indicate that vibration exists, the alarm output is maintained based on the vibration (step 216). However, if the vibration sensor 52 is not turned on, it is clear from the outputs of all three sensors that the sensor body 30 is in a normal state in close contact with the set plate, thereby releasing the alarm.

On the other hand, when the read flag (REED_FLAG) value is "1" in step 208, indicating that the reed switch 54 was previously turned off, the reed switch 54 is changed to the turned on state from the turned off state. In this case, in step 220, the read flag (REED_FLAG) is set to “0” to indicate the turn-on state. In step 222, it is determined whether the hinge 20 is rotated in the forward direction (the direction in which the sensor body is unfolded) or in the reverse direction (the direction in which the sensor body is folded). If the hinge 20 is rotated in the forward direction, it is highly likely to correspond to the case in which the sensor body 30 is attached to the set plate. However, when the hinge 20 is judged to rotate in the reverse direction in step 222, after confirming whether the sensor body 30 is seated on the holder 10 as whether the present angle is 0 degrees, the alarm output is maintained. (Step 224, step 226). After maintaining or releasing the alarm output in step 212, 216, 218 or 226, the process proceeds to step 202 to check the state of the reed switch.

9 specifically illustrates alarm output timing when assuming an actual operation sequence.

It is assumed that the sensor body 30 moves from the time point T0 to the time point T1 to the holder 10 and rests on the holder 10 at T1. At T1, the reed switch 54 is turned on, and before and after T1, the rotation angle sensor 56 maintains a stationary state after the reverse rotation, and the rotation angle maintains a value lower than the set angle.

It is assumed that at T2 the sensor body 30 begins to deploy off the holder 10 and comes into close contact with the set plate at T3. The forward rotation angle sensor 56 reaches the set angle error range immediately before T3. Immediately after the sensor body 30 is in close contact with the set plate, the vibration sensor can be reset. The alarm output is released at T3, which is the time when the sensor body 30 is in close contact with the set plate. At T4, when the user or a third party leaves the sensor body 30 off the set plate, an alarm is triggered again, which continues until T7 where the sensor body 30 is in close contact with the set plate again.

In close contact with the set plate at T7, assume that someone removes the set plate from the door and then rotates the sensor body 30 with the set plate to open the door. At this time, even if the reed switch is kept turned on, the controller 80 issues an alarm at T8 at the moment of confirming that the rotation angle is smaller than the set angle. This alert continues until T12 at which the sensor body 30 or the monitoring device of the security service company is reset or the sensor body 30 is in close contact with the set plate again.

On the other hand, even if the reed switch 54 is turned on and the rotation angle is larger than the set angle, the alarm output resumes again at the moment when the vibration sensor 52 detects the vibration, for example, T13.

Thus, in this operation example, even if any one of the vibration sensor 52, the reed switch 54, and the rotation angle sensor 56 detects an abnormal indication, an alarm output is made.

Second operation example

10 shows a second operation example of the displacement sensing device. This operation example is similar to the first operation example except that an alarm is not generated even when the sensor body 30 is seated on the holder 10. That is, in this operation example, the controller 80 does not output an alarm when the reed switch 54 is turned on unless the rotation angle is smaller than the set angle or vibration is detected. On the other hand, when the reed switch 54 is turned off, the rotation angle is smaller than the set angle, or vibration is detected, the controller 80 outputs an alarm.

The timing diagram of FIG. 10 is similar to that of FIG. 9 except that the time interval in which the alarm output is not made corresponds to T1 to T2, T5 to T6, and T10 to T11 while the sensor body 30 is seated on the holder 10. FIG. You can easily see the magnification. As the section in which an alarm is generated unnecessarily is reduced, the burden of a person in charge of monitoring, for example, a person in charge of a monitoring device of a security service company, can be reduced.

Third operation example

11 shows a third operation example of the displacement sensing device. This operation example is also similar to the first and second operation examples, and the time period for generating an alarm is further limited. That is, in this working example, when the door is likely to be opened or closed by the normal method or the wrong method, that is, the sensor body 30 is disengaged from the set plate (lead switch is turned off and the rotation angle becomes smaller than the set angle). Immediately after the event), the alarm is generated only immediately after the rotation angle is smaller than the set angle without changing the switching state of the reed switch and immediately after the vibration is detected. In this case, the alarm generation period may be set constant regardless of the cause of the alarm, for example, may be set as a short time such as 2 seconds or longer. As the section in which an alarm is generated unnecessarily is further reduced, the possibility of confusion of a monitoring person becomes even lower.

Those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features.

For example, in the above description, although the holder 10 is fixed to the door frame and the sensor body 30 is attached to or detached from the set plate provided on the door, the holder 10 is fixed to the door and the sensor body 30 is installed. Set plate to be separated / coupled to the) may be provided to the door frame.

In the above description, the control unit 80 outputs a status signal to the relay 84, and the relay 84 has been described based on an application example for supplying a DC alarm signal to a monitoring equipment of a security service company located at a remote location. However, of course, such monitoring equipment may be located in the building where the displacement sensing device is installed. In addition, the relay may provide a status signal directly instead of supplying a high level DC alarm signal to the monitoring equipment. In addition, a state signal or a detection signal of each sensor may be provided by being modulated or encoded in a predetermined manner.

On the other hand, in the above description has been described with a focus on the application for detecting the opening and closing of the door, such as a safe door, the displacement detection device may be used for other purposes. For example, a stolen attempt may be detected by installing a displacement sensing device individually at the back or the bottom of each exhibit in a museum or an art gallery. In the case of such an application, as described above, instead of supplying the alarm signal to the external monitoring equipment, it may be manufactured as a stand-alone type or a portable type that can be pronounced by itself.

Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

As described above, according to the present invention, the displacement sensing device can accurately detect the displacement of the object and lower the possibility of avoidance by an illegal method. In particular, when used for detecting the safe open and close, there is an effect that can be prevented by the insider to open unfairly in the organization using the. In addition, the displacement detection device of the present invention is not limited to the application of the safe and can be applied to various kinds and types of objects, such as valuables displayed in the exhibition hall as well as general doors to detect the movement.

Claims (3)

Apparatus for detecting the displacement of the object by detecting whether the contact with the set plate installed on the other one of the object and the object mounting surface fixed to the object and the set plate is installed on the other one of the object mounting surface as, A holder installed to be fixed to the fixing surface; A hinge provided on one side of the holder; And A sensor body coupled to the holder through the hinge and rotatable about the hinge; Equipped with The sensor body is provided with a reed switch for detecting whether the contact with the set plate, And the hinge includes a rotation angle sensor for detecting whether the sensor body is rotatable about the hinge and a rotation angle size therein. The method of claim 1, Determining means for determining whether the object moves based on whether the sensor body and the set plate are in contact, whether the sensor body is rotated, and a rotation angle; Displacement sensing device further comprising. The method according to claim 1 or 2, A vibration sensor for detecting vibration due to an impact applied from the outside; Further, wherein the determining means is a displacement sensing device for determining whether the object is moved based on whether the sensor body and the set plate contact, the rotation and rotation angle of the sensor body, and whether the vibration is detected.