JP2006242696A - Opening/closing detection sensor and opening/closing detection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology capable of detecting an opening/closing state having concurrently high-level safety and small power consumption. <P>SOLUTION: This sensor is equipped with a detection light detecting circuit part 32 for discriminating the opening/closing state of a door, based on reception of detection light L1, L2, and a communication light control circuit part 34 and a response communication light control circuit part 46 for discriminating the opening/closing state of the door, by discriminating whether communication light S1, S2 including a normal code can be received. The detection light detecting circuit part 32 performs operation for discriminating the opening/closing state at each comparatively-short interval period (for example, each second). The communication light control circuit part 34 and the response communication light control circuit part 46 perform operation for discriminating the opening/closing state at each comparatively-long interval period (for example, each 30 seconds). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an opening / closing detection sensor for detecting opening / closing of a window, a door, or the like.

  An open / close detection sensor is attached to a window glass or a door for crime prevention.

  Conventional open / close detection sensors include a non-contact type using a magnet and a reed switch that is turned on and off by its magnetic force, and a type using a mechanical switch that opens and closes directly in contact with a window or door. .

  However, these open / close detection sensors may be easily crafted into a state in which open / close detection is not possible by using a substitute magnet or by processing the mechanical switch itself.

  In view of this, an open / close detection sensor capable of obtaining a higher level of safety may be one that uses communication light or the like and makes an open / close determination by a predetermined arithmetic process using an electronic circuit.

  However, in the sensor using the electronic circuit, the power consumption tends to increase because a predetermined calculation process is regularly performed to make an open / close determination. For example, it is difficult to use a battery or the like as a power source, and it is indispensable to receive power supply such as AC 100V from an external power source.

  Therefore, an object of the present invention is to provide a technique capable of performing detection of an open / closed state with both higher safety and low power consumption.

  An open / close detection sensor according to the present invention is an open / close detection sensor which is attached to an open / close body and its peripheral part and detects the open / close state of the open / close body, and determines the open / close state based on the presence or absence of detection light. First opening / closing state detecting means; and second opening / closing state detecting means for determining the opening / closing state by determining whether or not communication light including a normal code has been received. The state detecting means performs an operation for determining the open / closed state every predetermined first interval period, and the second open / closed state detecting means performs the operation every predetermined second interval period longer than the first interval period. The operation of determining the open / close state is performed.

  Another open / close detection sensor according to the present invention is an open / close detection sensor that is attached to the open / close body and its peripheral portion and detects the open / closed state of the open / close body, and is one of the open / close body and its peripheral portion. A light emitting unit that emits detection light, a light receiving unit that receives return detection light corresponding to the detection light, a first light transmission unit that emits communication light, and response communication light corresponding to the communication light. A first sensor device including a first light receiving unit for receiving, a detection light returning unit attached to the other of the opening and closing body and its peripheral part, and returning return detection light in response to the detection light; A second sensor device having communication light response means for transmitting response communication light in response to the communication light, wherein the first sensor device emits detection light through the light emitting unit at every predetermined first interval period. And the first interval period And whether the return detection light corresponding to the detection light is received based on the output signal from the light receiving unit and the timing circuit unit that outputs a start signal every predetermined second interval period that is longer than And detecting a return detection light when the return detection light cannot be received, and outputting a detection signal for detecting an open state, and starting the signal according to the activation signal, thereby providing a predetermined value through the first light transmission unit. The communication light including the code is emitted, and it is determined whether or not the response communication light including the normal response code can be received through the first optical receiver, and the open state notification signal is output when it is determined that the communication light cannot be received. And a communication light control circuit unit.

  In this case, the communication light response means of the second sensor device responds to the second light receiver that receives the communication light from the first light transmitter and the first light receiver. Activated when communication light is received via the second optical transmitter that emits light and the second optical receiver, determines whether or not communication light including a normal code has been received, and the normal code A response communication light control circuit unit that transmits response communication light including a predetermined response code through the second optical transmission unit when it is determined that the communication light including the signal can be received. Good.

  Further, at least one of the first sensor device and the second sensor device may be provided with a removal detecting means for detecting that the device has been removed from the opening / closing body or its peripheral portion. .

  Further, history information determined that at least one of the first sensor device and the second sensor device cannot receive return detection light by the detection light detection circuit unit, and a normal code by the communication light control circuit unit. At least one of history information determined to be unable to receive response communication light including the history information detected that the first sensor device or the second sensor device has been removed from the opening / closing body and its periphery. It may be configured to further comprise storage means for storing one.

  The open / close detection method of the present invention is an open / close detection method for detecting the open / close state of the open / close body, and the detection light is projected so that the light receiving state varies according to the open / close state of the open / close body. Communication light is transmitted so that the reception status varies according to the open / closed state of the open / close body, (a) determining the open / closed state based on the light receiving state of the detection light, and (b) a normal code And a step of determining whether or not the communication light including the signal can be received, wherein the step (a) is repeatedly performed every predetermined first interval period, and the step (b) is performed more than the first interval period. It is repeatedly performed every predetermined second interval period which is a long time.

  According to the open / close detection sensor of the present invention, the first open / close state detection means determines the open / close state in a relatively simple manner based on the presence or absence of detection light for each relatively short first interval period. Further, the second open / close state detecting means determines the open / close state in a relatively reliable manner by determining whether or not the communication light including the normal code has been received every relatively long second interval period. Do.

  For this reason, it is possible to detect an open / close state more reliably by dealing with an illegal work or the like by the second open / close state detection unit while detecting the open / close state frequently by the first open / close state detection unit. Yes, and a high level of safety can be secured.

  In addition, normally, the power consumption of the operation for determining whether or not the communication light including the normal code has been received tends to increase. However, the second open / close state detection means is configured to perform the above operation every second interval period that is relatively long. Since the open / closed state is determined, the power consumption can be reduced.

  According to another open / close detection sensor of the present invention, the detection light is emitted for each relatively short first interval period, and by detecting whether the return detection light corresponding to the detection light is received or not, The open / close state can be determined. In addition, it is possible to determine the open / closed state by determining whether or not response communication light including a normal response code can be received through the first optical receiver for each relatively long second interval period.

  For this reason, it is possible to detect the open / close state more reliably using the communication light while detecting the open / close state using the detection light at a relatively high frequency, and to ensure a high degree of safety.

  Usually, the communication light control circuit unit for determining whether or not the response communication light including the normal response code has been received tends to increase. However, the communication light control circuit unit has a relatively long second length. Since it is activated every interval period and the open / closed state is discriminated, it is possible to reduce power consumption.

  Furthermore, the communication light response means of the second sensor device emits response communication light toward the second light receiving unit that receives the communication light from the first light transmitting unit and the first light receiving unit. Activated when communication light is received via the second optical transmission unit and the second optical reception unit, determines whether communication light including a normal code has been received, and communication including a normal code A response communication light control circuit that includes a response communication light control circuit unit that transmits response communication light including a predetermined response code through the second optical transmission unit when it is determined that light has been received. The circuit portion can also reduce power consumption by reducing the operation time as much as possible.

  Further, when at least one of the first sensor device and the second sensor device is provided with a removal detecting means for detecting that it has been removed from the opening / closing body or its peripheral portion, the removal of each sensor device is performed. It can also detect the facts and take illegal measures.

  Further, history information determined that at least one of the first sensor device and the second sensor device cannot receive return detection light by the detection light detection circuit unit, and a normal code by the communication light control circuit unit. At least one of history information determined to be unable to receive response communication light including the history information detected that the first sensor device or the second sensor device has been removed from the opening / closing body and its periphery. Since the storage means for storing the information is further provided, the open / close state, the removal state of each sensor device, and the like can be managed.

  Further, according to the open / closed state detection method of the present invention, (a) a step of determining the open / closed state based on a light receiving state of the detection light, and (b) whether communication light including a normal code has been received or not. The step (a) is repeatedly performed every predetermined first interval period, and the step (b) is performed every predetermined second interval period that is longer than the first interval period. Since this process is repeated repeatedly, a high level of safety can be ensured. In the step (b), since the open / close state is determined every second interval period that is relatively long, the power consumption can be reduced.

  Hereinafter, an open / close detection sensor and an open / close detection method according to an embodiment of the present invention will be described.

  First, a usage pattern of the open / close detection sensor will be described. FIG. 1 is a diagram showing an example of use of an open / close detection sensor.

  In FIG. 1, a hinged door 14 is attached to a wall surface 10 of a building so as to be openable and closable, and a door frame 11 is disposed on a peripheral portion of the door 14.

  The open / close detection sensor 20 is configured by a combination of a first sensor device 22 and a second sensor device 40. The first sensor device 22 is attached to the door frame 11, and the second sensor device 40 is attached to the door 14. When the door 14 is closed, detection light L1, L2 and communication light S1, S2, which will be described later, are transmitted and received between the first sensor device 22 and the second sensor device 40. On the other hand, when the door 14 is opened, the detection lights L1 and L2 and the communication lights S1 and S2 are not transmitted and received.

  In this embodiment, an example in which the opening / closing body is the door 14 will be described. However, the present invention can be applied to other opening / closing bodies, for example, a sliding door type opening / closing body. The attachment positions of the first sensor device 22 and the second sensor device 40 may be reversed.

  FIG. 2 is an explanatory diagram illustrating paths of detection light and communication light transmitted and received between the first sensor device and the second sensor device.

  That is, the first sensor device 22 includes a light emitting unit 23, a light receiving unit 24, a first light transmitting unit 25, and a first light receiving unit 26, which are, for example, in a case 22a of the first sensor device 22. Is mounted and fixed at a predetermined position and posture on the board 22b housed in the board.

  The light emitting unit 23 is configured by a light emitting element such as a light emitting diode, and emits detection light L1 toward the second sensor device 40 in accordance with an output signal from a time measuring circuit unit 30 described later. The light receiving unit 24 includes a light receiving element such as a phototransistor, and receives the return detection light L2 from the second sensor device 40 and outputs this detection signal.

  The first optical transmission unit 25 is configured by a light emitting element such as a light emitting diode, and converts an electrical signal sent from a communication light control circuit unit 34 to be described later into an optical signal to be directed to the second sensor device 40. The communication light S1 is transmitted. The first light receiving unit 26 includes a light receiving element such as a phototransistor, receives response communication light S2 from the second sensor device 40, converts it into an electrical signal, and outputs it.

  The second sensor device 40 includes a prism 42 as a detection light return unit that returns the return detection light L2 in response to the detection light L1, a second light reception unit 43, and a second light transmission unit 44. I have. For example, these are mounted and fixed at a predetermined position and posture on a substrate 40b housed in a predetermined case 40a.

  The prism 42 is formed in a shape obtained by obliquely cutting off both end portions of the prismatic member. When the detection light L1 enters the prism 42, it is internally reflected at each slope. Accordingly, the return detection light L2 is emitted to the outside in the direction opposite to the incident direction of the detection light L1. Thereby, the return detection light L2 is projected according to the detection light L1.

  The detection light return means for returning the return detection light L2 according to the detection light L1 may be configured by means using a general reflecting mirror, waveguide, optical fiber, or the like in addition to the prism 42.

  The second optical receiver 43 is composed of a light receiving element such as a phototransistor, receives the communication light S1 from the first optical transmitter 25, converts it into an electrical signal, and outputs it. The second optical transmission unit 44 is configured by a light emitting element such as a light emitting diode, and converts an electrical signal from a response communication light control circuit unit 46 to be described later into an optical signal, which is directed to the first optical reception unit 26. The response communication light S2 is transmitted.

  The second optical receiver 43, the second optical transmitter 44, and the response communication light control circuit unit 46 function as communication light response means for transmitting the response communication light S2 in response to the communication light S1.

  When the door 14 is closed, the following paths are established for the detection light L1, the return detection light L2, the communication light S1, and the response communication light S2.

  That is, the detection light L1 projected from the light emitting unit 23 of the first sensor device 22 enters the prism 42 of the second sensor device 40, is internally reflected here, and is emitted as return detection light L2. The return detection light L2 is received by the light receiving unit 24 of the first sensor device 22.

  The communication light S <b> 1 transmitted from the first light transmission unit 25 of the first sensor device 22 is received by the second light reception unit 43 of the second sensor device 40 and the second light of the second sensor device 40. The response communication light S <b> 2 transmitted from the optical transmitter 44 is received by the first optical receiver 26 of the first sensor device 22.

  On the other hand, when the door 14 is opened, the paths of the detection light L1, the return detection light L2, the communication light S1, and the response communication light S2 are disconnected between the first sensor device 22 and the second sensor device 40. Accordingly, the return detection light L2 is not received by the light receiving unit 24, the communication light S1 is not received by the second light receiving unit 43, and the response communication light S2 is not received by the first light receiving unit 26.

  FIG. 3 is a block diagram showing an electrical configuration of the open / close detection sensor.

  The first sensor device 22 further includes a timing circuit unit 30, a detection light detection circuit unit 32, a communication light control circuit unit 34, a notification unit 36, and a removal detection unit 28.

  The timing circuit unit 30 is configured by, for example, a real-time clock (RTC) circuit, and outputs a detection light transmission signal for each first interval period to emit detection light through the light emitting unit 23 and for each second interval period. The start signal is output to. The first interval period and the second interval period are preset periods, and the second interval period is set longer than the second interval period. In particular, since the second interval period is an interval period in which the communication light control circuit unit 34 is activated and performs arithmetic processing as described later, the total power consumption by the arithmetic processing of the communication light control circuit unit 34 is the first sensor. It is preferable that the period is set such that the influence on the life of a power source (for example, a battery) incorporated in the device 22 can be minimized. In a preferred example, the first interval period is 1 second and the second interval period is 30 seconds.

  A detection light transmission signal from the timing circuit unit 30 is output to the light emitting unit 23 via the detection light detection circuit unit 32. The light emitting unit 23 converts the signal into light and emits it as detection light L1 to the outside. The activation signal from the time measuring circuit unit 30 is given to the communication light control circuit unit 34.

  Such a timing circuit unit 30 is realized by a circuit having only a timing function and a function of outputting a predetermined signal at a predetermined timing, such as a real-time clock circuit. This is realized by an electric element that consumes less power than the control circuit unit 34.

  The detection light detection circuit unit 32 detects whether the return detection light L2 corresponding to the detection light L1 is received based on the detection light transmission signal and the signal output from the light receiving unit 24, and detects the detection light L1. An open state detection signal is output when the return detection light L2 corresponding to is not received.

  More specifically, the detection light detection circuit unit 32 is configured by a logic circuit in which gate elements are combined, for example. Then, a logical operation is performed between the output state of the detection light transmission signal and the output state from the light receiving unit 24. When the output of the detection light transmission signal is high level and the output from the light reception unit 24 is low level, When the output of the light transmission signal is at a low level and the output from the light receiving unit 24 is at a high level, an open state detection signal is output. Here, when the output of the detection light transmission signal is high level and the output from the light receiving unit 24 is low level, the detection light L1 is normally emitted, but the return detection light L2 is received by the light receiving unit 24. It means a state that cannot be done. Further, the state in which the output of the detection light transmission signal is at a low level and the output from the light receiving unit 24 is at a high level usually means that some light is received by the light receiving unit 24 even though the detection light L1 is not emitted. This means a state where light is received, that is, a state where some light is received by the light receiving unit 24 at the timing before and after the detection light L1 is emitted. The detection light detection circuit unit 32 detects each of these states and outputs an open state detection signal.

  The detection light detection circuit unit 32 functions as a first open / close state detection unit that determines the open / close state based on whether the detection lights L1 and L2 are received.

  When the detection light detection circuit unit 32 outputs an open state detection signal to the communication light control circuit unit 34, the communication light control circuit unit 34 sets the detection conditions in the detection light detection circuit unit 32 separately from the processing described later. After performing the control process so as to invert, the operation is terminated. As a result, once the door 14 is detected to be opened and an open state detection signal is output, the output of the open state detection signal is stopped even when the door 14 remains open, and the communication light control circuit unit 34 Start-up is suppressed. When the door 14 is closed again, the closed state of the door 14 is detected and the communication light control circuit unit 34 is once activated and controlled to return the detection condition to the end, and the operation is ended. To do.

  The communication light control circuit unit 34 is configured by a general microcomputer including a CPU, a ROM, a RAM 34a, and the like, and executes processing to be described later with a software program stored in advance.

  Then, an activation signal from the timing circuit unit 30, an open state detection signal from the detection light detection circuit unit 32, an output signal from the first light reception unit 26, and a removal detection unit 28, which will be described later, are transmitted to the communication light control circuit unit 34. Given to. Based on these signals, the communication light control circuit unit 34 performs operation control of the first light transmission unit 25 and the notification unit 36, write control to the RAM 34a, and the like, as will be described in detail later. The communication light control circuit unit 34 and the response communication light control circuit unit 46 determine the open / closed state by determining whether or not the communication lights S1 and S2 including the normal code have been received. Functions as a means.

  The notification unit 36 includes a sounding body such as a piezoelectric buzzer or a speaker. As the notification unit 36, a light emitter such as an LED may be used. Then, according to the control by the communication light control circuit unit 34, a notification operation using sound or the like is performed at a timing described later.

  The removal detection unit 28 functions as a removal detection unit that detects that the first sensor device 22 has been removed from the door frame 11. Here, the removal detection unit 28 is configured by a micro switch, and one side contact of the micro switch is connected to a signal input terminal of the communication light control circuit unit 34 and is connected to a predetermined potential via a pull-up resistor. The other side contact is grounded. The first sensor device 22 is attached to or detached from the door frame 11 so that the contacts of the microswitch are opened and closed. Thereby, the output according to the attachment and removal state of the first sensor device 22 with respect to the door frame 11 is configured to be given to a predetermined signal input terminal of the communication light control circuit unit 34.

  FIG. 4 is a flowchart showing the operation contents of the communication light control circuit unit in the first sensor device.

  First, in the normal state, the communication light control circuit unit 34 is in a non-activated state (refers to a state in which power consumption is less than that in an activated state in which each process of Step S1 to Step S10 described later is executed).

  When any one of the open state detection signal from the detection light detection circuit unit 32, the activation signal from the timing circuit unit 30, and the detection signal from the removal detection unit 28 is input to the communication light control circuit unit 34. As shown in step S1, the communication light control circuit unit 34 is activated to execute a predetermined activation process.

  Thereafter, the process proceeds to step S2, and it is determined whether the input signal is an open state detection signal, an activation signal from the time measuring circuit unit 30, or a removal detection signal.

  When it is determined in step S2 that the input signal is an open state detection signal, the process proceeds to step S3, where notification is performed through the notification unit 36. Thereafter, the process proceeds to step S4, and the open state detection time is read from the timing circuit unit 30 and stored in the RAM 34a.

  Then, it progresses to step S9, performs a predetermined | prescribed termination process, and transfers to a non-activation state.

  On the other hand, if it is determined in step S2 that the input signal is the activation signal from the time measuring circuit unit 30, the process proceeds to step S5. In step S <b> 5, the communication light S <b> 1 including a predetermined identification code set in advance is transmitted toward the second sensor device 40 through the first optical transmission unit 25. This identification code is preferably encrypted.

  Next, proceeding to step S6, it is determined whether or not the response of the optical signal is normal. For example, an optical signal to be responded from the second sensor device 40 is received through the first optical receiver 26, and the response identification code included in the signal matches a predetermined response identification code set in advance. If so, the response is determined to be normal. In other cases, for example, when no optical signal is received or when the response identification codes do not match, it is determined that the response is abnormal.

  If it is determined in step S6 that the response is abnormal, the process proceeds to step S7, an open state notification signal is output, and notification is performed through the notification unit 36. Thereafter, the process proceeds to step S8, and the time when the response abnormality is detected is stored in the RAM 34a.

  Then, it progresses to step S9, performs a predetermined | prescribed termination process, and transfers to a non-activation state.

  If it is determined in step S6 that the response is normal, the process proceeds to step S9, a predetermined end process is executed, and a transition to the non-activated state is made.

  If it is determined in step S2 that the input signal is a removal detection signal, the process proceeds to step S10. In step S10, the history of detection of removal is stored in the RAM 34a. Then, it progresses to step S9, performs a predetermined | prescribed termination process, and transfers to a non-activation state.

  That is, the communication light control circuit unit 34 is activated according to the activation signal every second interval period. Then, the communication light control circuit unit 34 emits the communication light S1 including the predetermined code through the first optical transmission unit 25 and receives the response communication light S2 including the normal response code through the first optical reception unit 26. It has a function of determining whether or not it is possible and outputting an open state notification signal when it is determined that reception is impossible.

  In this embodiment, the communication light control circuit unit 34 detects the open state among the timings at which the detection light L1 is emitted in the first interval period in addition to the above timing, The communication light control circuit unit 34 is in the non-activated state during the period excluding these activation times.

  The removal detection time and the like stored in the RAM 34a can be appropriately read by an external computer device through an interface.

  Returning to FIG. 3, the second sensor device 40 further includes a response communication light control circuit unit 46 and a removal detection unit 48.

  The response communication light control circuit unit 46 is configured by a general microcomputer including a CPU, a ROM, a RAM 46a, and the like, and executes processing to be described later with a software program stored in advance.

  Then, output signals from the second light receiving unit 43 and the removal detecting unit 48 are given to the response communication light control circuit unit 46. Based on these signals, the response communication light control circuit unit 46 performs operation control of the second light transmission unit 44, control of writing to the RAM 46a, and the like, as will be described in detail later.

  The removal detection unit 48 functions as a removal detection unit that detects that the second sensor device 40 has been removed from the door 14. Here, similarly to the above-described removal detection unit 28, the removal detection unit 48 is configured by means including a micro switch. And the output according to the attachment and removal state of the 2nd sensor apparatus 40 with respect to the door frame 11 is given to the predetermined | prescribed signal input terminal of the response communication light control circuit part 46. FIG.

  FIG. 5 is a flowchart showing the operation content of the communication light control circuit unit in the second sensor device.

  First, the response communication light control circuit unit 46 is in a non-activated state (which means a state in which power consumption is less than that in an activated state in which each process of Steps S21 to S26 described later) is performed in a normal state.

  When either the output signal from the second optical receiver 43 or the detection signal from the removal detector 48 is input to the response communication light control circuit unit 46, as shown in step S21, the response The communication light control circuit unit 46 is activated to execute a predetermined activation process.

  Thereafter, the process proceeds to step S22, in which it is determined whether the input signal is an output signal from the second optical receiver 43 or a detection signal from the removal detector 48.

  If it is determined in step S22 that the input signal is an output signal from the second optical receiver 43, that is, if it is determined that an optical signal has been received, the process proceeds to step S23.

  In step S23, it is determined whether or not the optical signal is normal. For example, the communication light S2 to be transmitted from the first sensor device 22 is received through the second optical receiver 43, and the identification code included in the signal matches a predetermined identification code set in advance. In this case, it is determined that the optical signal is normal. In other cases, for example, when the identification codes do not match, it is determined that the optical signal is abnormal.

  If it is determined in step S23 that the optical signal is normal, the process proceeds to step S24. In step S <b> 24, the communication light S <b> 2 including a predetermined response identification code set in advance is transmitted toward the first sensor device 22 through the second optical transmission unit 44. This response identification code is also preferably encrypted.

  Next, it progresses to step S25, a predetermined | prescribed termination process is performed, and it transfers to a non-activation state.

  If it is determined in step S23 that the optical signal is abnormal, the process proceeds to step S25, where a predetermined end process is executed to shift to a non-activated state.

  If it is determined in step S22 that the input signal is a removal detection signal, the process proceeds to step S26.

  In step S26, the history of detection of removal is stored in the RAM 46a. Then, it progresses to step S25, performs a predetermined | prescribed termination process, and transfers to a non-activation state.

  That is, the response communication light control circuit unit 46 is activated when the communication light S1 is received through the second light transmission unit 44, and determines whether or not the communication light S1 including the normal code has been received. When it is determined that the communication light S <b> 1 including the reference numeral can be received, it functions as means for transmitting the response communication light S <b> 2 through the second optical transmission unit 44.

  Note that the removal detection history stored in the RAM 46a can be appropriately read by an external computer device through an interface.

  The overall detection operation of the open / close detection sensor configured as described above will be described.

  First, in a state where the door 14 is closed, an open state is detected based on whether or not the return detection light L2 is received according to the detection light L1 every first interval period (for example, 1 second). Further, the open state is detected by determining whether or not the response communication light S2 is received according to the communication light S1 every second interval period.

  When the door 14 is opened from this state, the relative positional relationship between the first sensor device 22 and the second sensor device 40 is shifted, and the path of the detection light L1 or the return detection light L2 is interrupted. As a result, an open state detection signal is output from the detection light detection circuit unit 32, and notification is made through the communication light control circuit unit 34 and the notification unit 36.

  The detection of the open state here is made depending on whether or not the return detection light L2 is received. For this reason, if the first sensor device 22 is crafted such as attaching a reflection means other than the prism 42, the open state may not be detected.

  Even in such a case, detection of the open state is performed using the communication light S1 including the identification code and the response communication light S2 including the response identification code every second interval period (for example, 30 seconds). Since the communication light S1 and the response communication light S2 include the identification code and the response identification code, it is difficult to impersonate by the above-mentioned work, and the open state is detected more reliably.

  In each of these states, when the first sensor device 22 and the second sensor device 40 are removed, the history information of each removal is written in the RAMs 33a and 46a. For this reason, even when the first sensor device 22 and the second sensor device 40 themselves are removed and some work is performed to restore the original state, the fact can be monitored.

  According to the open / close detection sensor configured as described above, the detection light L1 is emitted for each relatively short first interval period, and whether or not the return detection light L2 corresponding to the detection light L1 is received is detected. Thus, the open state of the door 14 can be detected. In addition, the communication light S1 including the predetermined identification code is emitted for each relatively long second interval period, and it is determined whether or not the response communication light S2 including the predetermined response identification code can be received according to this. Thus, the open state of the door 14 can be detected.

  Therefore, the detection of the open state using the detection lights L1 and L2 with relatively high frequency, and the detection of the open state with higher reliability using the communication lights S1 and S2 that are difficult to impersonate with relatively low frequency. It is possible to ensure a high level of safety.

  Normally, the communication light control circuit unit 34 that determines whether or not the response communication light S2 including the normal code has been received tends to increase. However, the communication light control circuit unit 34 is in the open state. With respect to the operation to be detected, it is activated every second interval period that is relatively long, and the open / close state is determined. Therefore, only the time counting circuit unit 30 having extremely low power consumption can be always activated, and the power consumption of the entire apparatus can be reduced. For example, a typical small lithium battery can be expected to have a life of 10 years or longer, and as a result, wiring for receiving external power supply can be omitted.

  Further, also for the second sensor device 40, when the communication light S1 is received via the second light receiving unit 43, the response communication light control circuit unit 46 is activated and can receive the communication light S1 including the normal code. When the response communication light S2 is transmitted through the second optical transmission unit 44 when it is determined that the response communication light S2 is legitimate, the response communication light control circuit unit 46 also includes: The operation time can be reduced as much as possible to reduce power consumption.

  Moreover, since the 1st sensor apparatus 22 and the 2nd sensor apparatus 40 are provided with the removal detection parts 28 and 48 which detect having removed from the door frame 11 of the door 14 or its periphery part, the sensor apparatus 22, 40 removal facts can also be detected. Thereby, it becomes easy to cope with an unauthorized work or the like accompanied by removal of the sensor devices 22 and 40.

  Furthermore, since history information such as the detection time of each open state and the detection time of removal described above is stored in the RAM 33a, 48a, etc., the open / close state, the removal state of each sensor device, and the like can be managed.

{Modification}
The removal detection units 28 and 48 may be provided only on one side of the sensor devices 22 and 40. Moreover, you may make it alert | report through an alerting | reporting means etc. at the time of removal detection.

  Furthermore, in addition to or instead of the configuration in which notification is made at the location when the open state is detected, a configuration in which notification is made by equipment in another location (for example, a centralized monitoring center of a security system) connected via a communication path. Also good.

  Further, the content stored in the RAMs 33a and 46a may be at least one of the detection times of the open states and the removal detection times.

  As a usage form of such an open / close detection sensor 20, for example, in an office building or a hospital, it may be installed on a door that should not be opened / closed for a limited time period, and an opening / closing history may be left. .

  In addition, when it is applied for crime prevention in a general house, power wiring work or the like is not required, so that it can be easily attached. Moreover, it can be used for judgment of health, crime prevention, etc. by attaching to the elderly living alone and managing the detection state of the open / close detection sensor 20 through a predetermined communication line.

  Further, the open / close detection sensor 20 can be attached to a door of a safe, a drawer of a cabinet, a door, or the like in addition to the door to the building as described above.

FIG. 1 is a diagram showing an example of use of an open / close detection sensor. It is explanatory drawing which shows the path | route of the detection light and communication light which are transmitted / received between a 1st sensor apparatus and a 2nd sensor apparatus. It is a block diagram which shows the electrical structure of an opening / closing detection sensor. It is a flowchart which shows the operation | movement content of the communication light control circuit part in a 1st sensor apparatus. It is a flowchart which shows the operation | movement content of the communication light control circuit part in a 2nd sensor apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Door frame 14 Door 20 Opening / closing detection sensor 22 1st sensor apparatus 23 Light emission part 24 Light reception part 25 1st light transmission part 26 1st light reception part 28,48 Removal detection part 30 Timing circuit part 32 Detection light detection circuit part 34 Communication Light Control Circuit Unit 34a RAM
36 Notification unit 40 Second sensor device 42 Prism 43 Second light receiving unit 44 Second light transmitting unit 46 Response communication light control circuit unit 46a RAM
L1, L2 detection light S1, S2 Communication light

Claims (6)

An open / close detection sensor attached to the open / close body and its peripheral part to detect the open / close state of the open / close body,
First open / closed state detecting means for determining the open / closed state based on the presence or absence of detection light;
Second opening / closing state detecting means for determining the opening / closing state by determining whether or not communication light including a normal code has been received;
With
The first open / close state detection means performs an operation of determining the open / close state for each predetermined first interval period, and the second open / close state detection means has a predetermined second longer than the first interval period. An open / close detection sensor that performs an operation of determining the open / close state for each interval period. An open / close detection sensor attached to the open / close body and its peripheral part to detect the open / close state of the open / close body,
A light emitting unit that emits detection light, is attached to one of the opening and closing body and its peripheral part, a light receiving unit that receives return detection light according to the detection light, and a first light transmission unit that emits communication light A first sensor device including a first light receiving unit that receives response communication light according to the communication light;
Detection light return means that is attached to the other of the opening and closing body and its peripheral part and returns return detection light according to the detection light; and communication light response means that transmits response communication light according to the communication light. A second sensor device comprising:
With
The first sensor device includes:
A timing circuit unit that emits detection light through the light emitting unit every predetermined first interval period and outputs an activation signal every predetermined second interval period that is longer than the first interval period;
Return detection light that detects whether the return detection light corresponding to the detection light is received based on an output signal from the light receiving unit, and outputs an open state detection signal when the return detection light cannot be received A detection circuit unit;
By activating in response to the activation signal, it is possible to emit communication light including a predetermined code through the first optical transmission unit and receive response communication light including a normal response code through the first optical reception unit. A communication light control circuit unit that outputs an open state notification signal when it is determined that reception is not possible,
An open / close detection sensor further comprising: The open / close detection sensor according to claim 2,
The communication light response means of the second sensor device includes a second light reception unit that receives communication light from the first light transmission unit, and a first light transmission unit that emits response communication light toward the first light reception unit. When communication light is received via the second optical transmitter and the second optical receiver, the communication light is activated to determine whether the communication light including the normal code has been received, and the communication light including the normal code. A response communication light control circuit unit that transmits response communication light including a predetermined response code through the second optical transmission unit when it is determined that the signal has been received. The open / close detection sensor according to claim 2 or 3,
At least one of the first sensor device and the second sensor device is an opening / closing detection sensor provided with a removal detecting means for detecting that the device has been removed from the opening / closing body or its peripheral portion. The open / close detection sensor according to any one of claims 2 to 4,
At least one of the first sensor device and the second sensor device includes history information determined that the detection light detection circuit unit cannot receive return detection light, and includes a normal code in the communication light control circuit unit. At least one of history information determined that the response communication light cannot be received, and history information detected when the first sensor device or the second sensor device is removed from the opening / closing body and its peripheral portion. An open / close detection sensor further comprising storage means for storing. An open / close detection method for detecting an open / close state of the open / close body,
The detection light is projected so that the light reception state varies depending on the open / close state of the opening / closing body, and the communication light is transmitted so that the reception state varies depending on the open / close state of the opening / closing body,
(A) determining the open / closed state based on a light receiving state of the detection light;
(B) a step of determining whether or not communication light including a normal code has been received;
With
The opening / closing detection method, wherein the step (a) is repeatedly performed every predetermined first interval period, and the step (b) is repeatedly performed every predetermined second interval period which is longer than the first interval period. .

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