JP7233748B2 - card keychain - Google Patents

Description

The present invention relates to card key holders.

A card comprising: a case; a switch provided to face a card insertion space inside the case; A card switch device has been proposed in which a switch is turned on and off by inserting and withdrawing a card from an insertion space (see, for example, Patent Document 1). This card switch device is used as a switch for turning on and off lighting fixtures, air conditioners, etc. in rooms such as hotels.

Japanese Utility Model Laid-Open No. 3-33928

However, in the case of the card switch device described in Patent Document 1, the switch is turned on even if a card other than a card key is inserted, as long as the card can be inserted into the card insertion space inside the case. For this reason, for example, a hotel guest inserts a card other than the card key (for example, a business card) into the card insertion space inside the case and uses the card key while the lighting fixtures, air conditioner, etc. in the room are on. You may go out with it. In this case, even though there are no guests in the room, the lighting fixtures, air conditioners, etc. in the room may continue to be turned on, and there is a risk that the hotel as a whole will not be able to achieve a sufficient energy saving effect. be. Therefore, whether or not the card inserted into the card holder is a card key is discriminated with high accuracy, and when a card other than the card key is inserted into the card holder, the illumination lamps in the room are not turned on. technology is requested.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a card key holder capable of accurately discriminating between a card key and other cards.

In order to achieve the above object, the card key holder according to the present invention
A card key holder that is installed in a room and holds a card key for unlocking a door installed at the entrance of the room,
a holder body having an arrangement area in which the card key is arranged;
A card that has at least one electrode and determines whether or not the object is the card key based on the capacitance between the object placed in the placement area and the at least one electrode. a key detection module ;
The card key has a conductor pattern embedded therein,
The card key detection module is
Based on the time history of the capacitance between the object and the at least one electrode when the object is moved from the outside of the holder body to the placement area, the object is detected by the card key. determine whether there is

According to the present invention, the card key detection module determines whether the object is a card key based on the capacitance between the object placed in the placement area within the holder body and at least one electrode. determine. As a result, the card key detection module can discriminate, for example, between a card key embedded with a loop antenna and other cards, so that it can accurately discriminate whether or not the object is a card key. .

1 shows a card holder according to an embodiment of the present invention, (A) is a front view, and (B) is a cross-sectional view taken along line AA of (A). 4 is a block diagram of a card key detection module according to an embodiment; FIG. (A) is a circuit diagram showing a part of the card key detection module according to the embodiment; (B) is an operation explanatory diagram showing one state of the card key detection module according to the embodiment; FIG. 10 is an operation explanatory diagram showing another state of the card key detection module according to the embodiment; (A) is a block diagram showing part of a card key detection module according to an embodiment, (B) is a diagram showing an example of an output signal of a current mirror circuit according to an embodiment, (C) is a FIG. 10A is a diagram showing an example of an output signal of a detection signal generation circuit according to an embodiment, and FIG. 14D is a diagram showing an example of an output signal of a detection signal counter according to the embodiment; 3 is a block diagram showing the functional configuration of a control unit according to the embodiment; FIG. 7 is a flow chart showing an example of the flow of card key detection processing executed by the control unit according to the embodiment; FIG. 4A is a schematic diagram showing how the card key is inserted into the card key holder according to the embodiment, FIG. It shows a state in which the card key is inserted further into the main body, and (C) shows a state in which the card key is held in the card key holder. FIG. 11 shows a time history of difference values calculated by the control unit according to the embodiment, (A) is a diagram showing an example of a time history of difference values when a card key is inserted into an arrangement area of a holder main body; ) is a diagram showing an example of the time history of difference values when the card key is removed from the holder body. (A) is a front view of a card key detection module according to a modification, and (B) is a front view of a card key detection module according to another modification. (A) is a front view of a card key detection module according to a modification, and (B) is a diagram showing a state in which the card key is held in a card key holder according to the modification. (A) is a front view of a card key detection module according to a modification, and (B) is a diagram showing a state in which the card key is held in a card key holder according to the modification.

A card key holder according to an embodiment of the present invention will be described below with reference to the drawings. A card key holder according to this embodiment is installed in a room and holds a card key for unlocking a door installed at the entrance of the room. This card key holder has a holder body having an arrangement area in which at least a part of the card key is arranged, and at least one electrode, and the object arranged in the arrangement area and the at least one electrode. a card key detection module for determining whether the object is a card key based on the capacitance between them. A card key functions as a passive tag in which, for example, a loop-shaped conductor pattern is embedded along the periphery. An example of the loop-shaped conductor pattern is a loop antenna.

For example, as shown in FIGS. 1A and 1B, the card key holder 1 according to the present embodiment includes a holder body 11 having an arrangement area A1 in which a part of the card key CA is arranged, and a card key CA. and a detection module 100 . In FIGS. 1A and 1B, the vertically upward direction is the +Z direction, and the forward direction is the +Y direction. This card key holder 1 is installed, for example, in a room of an accommodation facility. The holder body 11 has a flat box shape with a rectangular shape in plan view, and has a front cover 111 with one side in the thickness direction, that is, the -Y direction side opened, and covers the -Y direction side of the front cover 111. and a base member 13 arranged to. A part of the peripheral wall of the front cover 111 on the +Z direction side is provided with an opening 111a for inserting the card key CA into the inside of the holder main body 11 along a preset first direction, that is, the -Z direction. It is

The holder main body 11 is arranged inside the holder main body 11 and is made of a support piece 112 that supports the lower end portion of the card key CA inserted into the arrangement area A1 inside the holder main body 11, and a plate-like member made of, for example, glass. and a partition wall 113 separating the card key detection module 100 and the arrangement area A1. The support piece 112 has a plate-shaped main piece 112a arranged along the Z-axis direction, and a bent piece 112b protruding from the upper end of the main piece to the front side.

The base member 13 includes a rectangular plate-shaped main portion 131, ribs 132 and 133 projecting in the +Y direction from the lower end and upper end of the main portion 131, respectively, and both ends in the X-axis direction at the center of the main portion 131. and a rib 134 projecting in the +Y direction. The ribs 132 and 133 are provided with screw holes 132a and 133a, respectively, and the rib 134 is also provided with a screw hole (not shown). The support piece 112 is fixed to the base member 13 by a screw 135 which is inserted into a through hole 112c formed in the lower end of the main piece 112a and screwed into a screw hole 132a of the rib 132. As shown in FIG. The partition wall 113 is fixed to the base member 13 by a screw 136 which is inserted through a through hole 113a formed in the upper end of the partition wall 113 and screwed into a screw hole 133a of the rib 133. As shown in FIG.

The card key detection module 100 detects the time history of the capacitance between the card-shaped object and the five electrodes 152 when the card-shaped object is moved from the outside of the holder body 11 to the arrangement area A1 inside the holder body 11. Based on, it is determined whether or not the object is the card key CA. Further, the card key detection module 100 detects the capacitance between the card-shaped object and each of the five electrodes 152 when a part of the card-shaped object is placed in the placement area A1 inside the holder body 11. to determine whether the object is the card key CA. Also, the card key detection module 100 can communicate with the device 9 installed in the room. Examples of the equipment 9 include various equipment such as lighting fixtures and refrigerators. When the user of the room inserts the card key CA into the opening 111a of the card key holder 1, the card key detection module 100 detects that the card key CA has been inserted into the placement area A1, and transmits insertion detection information to the device 9. do. When the device 9 receives the insertion detection information from the card key detection module 100, the device 9 becomes operable. On the other hand, when the user removes the card key CA from the opening 111 a of the card key holder 1 , the card key detection module 100 detects that the card key CA has been removed from the arrangement area A 1 and transmits removal detection information to the device 9 . do. Then, when the device 9 receives the removal detection information from the card key detection module 100, the device 9 becomes inoperable again.

The card key detection module 100 has a circuit board 151 , five electrodes 152 arranged on one side in the thickness direction of the circuit board 151 , that is, on the +Y direction side, and a control unit 16 . The circuit board 151 is arranged inside the holder body 11 in a posture in which the five electrodes 152 face the arrangement area A1 in the holder body 11 in the second direction perpendicular to the Z-axis direction, that is, the Y-axis direction. It is Also, the five electrodes 152 are arranged in parallel along the X-axis direction. The circuit board 151 is inserted through through-holes (not shown) provided through both ends in the X-axis direction at the central portion in the Z-axis direction and screwed into screw holes drilled in the ribs 134 of the base member 13 . It is fixed to the base member 13 by screws 137 .

The control unit 16 is composed of, for example, one IC package, and as shown in FIG. It has a power supply circuit 1631 , a current mirror circuit 1632 , a capacitor C<b>1 , a detection signal generation circuit 1633 and a detection signal counter 1641 . The control unit 16 also has a reference current generation circuit 1634 , a reference signal generation circuit 1635 , a reference signal counter 1642 , a drive signal generation circuit 1643 and a control section 165 . The power supply circuit 1631 has a regulator (not shown) that is connected to the DC power supply Vcc and outputs a constant voltage by performing constant voltage control.

The reference current generation circuit 1634 has a DC-DC converter (not shown) that is connected to the power supply circuit 1631 and outputs a constant reference current value by performing constant current control. Reference current generation circuit 1634 outputs a constant reference current value DC current to drive signal generation circuit 1643 and reference signal generation circuit 1635 .

The drive signal generation circuit 1643 includes a current-controlled oscillator (not shown) that changes the frequency of the sine-wave signal output according to the reference current value of the input DC current, and a sine-wave signal input from the current-controlled oscillator. and a pulse generator (not shown) that generates a PWM (Pulse Width Modulation) signal having the same frequency as that and outputs it to the driving circuit 1621 .

The current mirror circuit 1632 has two switching elements, and supplies a current having a current value proportional to the current value of the current flowing through the switching element connected between the power supply circuit 1631 and the switching circuit 1622 to the detection signal generation circuit 1633 . Output. The switching circuit 1622 switches the SCF circuit 161 to which the current mirror circuit 1632 is connected among the five SCF circuits 161 at preset detection time intervals. As a result, the capacitance of the parasitic capacitance component Cv of each of the five electrodes 152 is detected at the detection time intervals described above.

There are five SCF circuits 161, and they are connected to five electrodes 152 via resistors R1. The SCF circuit 161 includes, for example, a switching element Q1 whose base is connected to the drive circuit 1621 and a switching element Q1 whose base is connected to the drive circuit 1621 and whose emitter is connected to the collector of the switching element Q1, as shown in FIG. and a device Q2. Although FIG. 3A shows an example in which the switching elements Q1 and Q2 are NPN-type bipolar transistors, at least one of them may be a PNP-type bipolar transistor.

The drive circuit 1621 has an inverter INV1, and outputs the PWM signal input from the drive signal generation circuit 1643 as it is to the base of the switching element Q1. Further, the drive circuit 1621 outputs the PWM signal input from the drive signal generation circuit 1643 to the base of the switching element Q2 via the inverter INV1. As a result, the switching elements Q1 and Q2 of the SCF circuit 161 alternately repeat the ON/OFF operation at the cycle of the PWM signal.

In the SCF circuit 161, during the period in which the switching element Q1 is on and the switching element Q2 is off, as indicated by the dashed arrow I1 in FIG. current flows to Thereby, the parasitic capacitance component Cv of the electrode 152 is charged. Here, the parasitic capacitance component Cv of the electrode 152 is defined by It corresponds to the capacitance component. At this time, current flows from the current mirror circuit 1632 to the detection signal generation circuit 1633, and current also flows from the current mirror circuit 1632 to the capacitor C1, as indicated by dashed arrows Id11 and Id12 in FIG. 3B. Here, as the capacitor C1 is charged and the current flowing to the capacitor C1 decreases, the current flowing to the detection signal generating circuit 1633 increases. On the other hand, during the period in which the switching element Q1 is turned off and the switching element Q2 is turned on, as indicated by the dashed arrow I2 in FIG. discharged. At this time, the capacitor C1 is discharged, and a current flows from the capacitor C1 to the detection signal generation circuit 1633, as indicated by the dashed arrow Id2 in FIG. 3C. Here, as the electricity charged in the capacitor C1 decreases, the current flowing from the capacitor C1 to the detection signal generation circuit 1633 decreases. Then, the current signal Sig1 output from the current mirror circuit 1632 shown in FIG. 4A to the detection signal generation circuit 1633 fluctuates with the period dt1 of the PWM signal with the maximum amplitude i1 as shown in FIG. 4B. A triangular current signal is obtained. This maximum amplitude i1 increases as the capacitance of the parasitic capacitance component Cv of the electrode 152 increases.

The detection signal generation circuit 1633 is a current control circuit in which the frequency of the sine wave signal Sig2 (see FIG. 4A) output from the current mirror circuit 1632 changes according to the magnitude of the maximum amplitude i1 of the current signal Sig1. It has an oscillator (not shown). The voltage signal Sig2 output from the detection signal generation circuit 1633 to the detection signal counter 1641 has a period dt2 corresponding to the maximum amplitude i1 of the current signal Sig1 input to the detection signal generation circuit 1633, as shown in FIG. becomes a sinusoidal signal that fluctuates at Here, the period dt2 becomes shorter as the maximum amplitude i1 becomes larger. Therefore, the larger the capacitance of the parasitic capacitance component Cv of the electrode 152, the larger the maximum amplitude i1 and the shorter the period dt2.

The detection signal counter 1641 counts the number of pulses included in the voltage signal Sig2 input from the detection signal generation circuit 1633 within the aforementioned detection time. The detection signal counter 1641 increments the output voltage by a preset unit voltage each time the voltage signal Sig3 reaches the maximum amplitude value, as shown in FIG. 4D, for example. Note that the detection signal counter 1641 increments the output voltage by a unit voltage each time it reaches a preset voltage lower than the voltage corresponding to the maximum amplitude value in one cycle of the voltage signal Sig2. good. When detection time dtc ends, detection signal counter 1641 outputs a count end signal to control unit 165 and initializes output voltage V[11] to 0V. Here, regarding the number of times the voltage signal Sig2 reaches the maximum amplitude value, the shorter the period dt2 of the voltage signal Sig2, the greater the number of times detected during the constant detection time dtc. Therefore, as the capacitance of the parasitic capacitance component Cv of the electrode 152 increases, the number of times the maximum amplitude value is reached increases, and the output voltage increases.

Returning to FIG. 2, the reference signal generation circuit 1635 is a current controlled oscillator (see FIG. not shown). The reference signal counter 1642 counts the number of pulses included in the voltage signal input from the reference signal generation circuit 1635 within the aforementioned detection time. The reference signal counter 1642 increments the output voltage by a preset unit voltage each time the voltage signal input from the reference signal generation circuit 1635 reaches the maximum amplitude value. When the detection time ends, the reference signal counter 1642 outputs a count end signal to the control section 165 and initializes the output voltage to 0V.

The control unit 165 has a data conversion control unit (hereinafter referred to as “DTC”) 1654 , a CPU (Central Processing Unit) 1651 , a main storage unit 1652 , an auxiliary storage unit 1653 and an interface 1655 . DTC 1654 has an analog-digital converter (not shown) and converts the output voltages of detection signal counter 1641 and reference signal counter 1642 into count value information indicating count values. Here, as the capacitance of the parasitic capacitance component Cv of the electrode 152 increases, the output voltage of the detection signal counter 1641 increases. Therefore, as the capacitance of the parasitic capacitance component Cv of the electrode 152 increases, the count value corresponding to the output voltage of the detection signal counter 1641 increases. The DTC 1654 causes the main storage unit 1652 to store the count value information obtained by conversion. The main storage unit 1652 is a volatile memory such as RAM (Random Access Memory) and is used as a work area for the CPU 1651 . Main storage unit 1652 also stores count value information input from DTC 1654 . Auxiliary storage unit 1653 is a non-volatile memory such as ROM (Read Only Memory), and stores programs for realizing various functions of control unit 165 . Interface 1655 is connected to device 9 .

The CPU 1651 reads the program stored in the auxiliary storage unit 1653 into the main storage unit 1652 and executes it, thereby, as shown in FIG. 16514 and detection information transmission unit 16515. 2 has a count value storage unit 16521 for storing count value information output from the DTC 1654 and a difference history storage unit 16522, as shown in FIG. The difference history storage unit 16522 stores difference value information indicating the difference value between the count value corresponding to the detection signal counter 1641 and the count value corresponding to the reference signal counter 1642 in chronological order. Here, as the capacitance of the parasitic capacitance component Cv of the electrode 152 increases, the count value corresponding to the detection signal counter 1641 increases, and accordingly the difference value of the count values also increases. In other words, the difference between the count values is a value reflecting the parasitic capacitance component Cv of the electrode 152, that is, the electrostatic capacitance between the electrode 152 and the object inserted in the arrangement area A1 of the holder body 11.

In addition, as shown in FIG. 5, the auxiliary storage unit 1653 shown in FIG. 2 stores detection time information indicating a detection time at which preset count value information is acquired, and preset values for a difference value to be described later. and a reference storage unit 16531 for storing threshold information indicating the calculated difference threshold.

The count value acquisition unit 16511 refers to the detection time information stored in the reference storage unit 16531, and when the detection time arrives, the count value information corresponding to the detection signal counter 1641 and the reference signal counter 1642 are transferred from the count value storage unit 16521 to the reference signal counter 1642. Acquire the corresponding count value information. The difference calculation unit 16512 calculates the difference value between the count values indicated by the two types of count value information acquired by the count value acquisition unit 16511 . The difference calculation unit 16512 causes the difference history storage unit 16522 to store difference value information indicating the calculated difference value in chronological order.

The determining unit 16513 determines whether the history of the difference values corresponding to the five electrodes 152A, 152B, 152C, 152D, and 152E corresponds to the conductor pattern embedded in the card key CA. It is determined whether or not the CA is inserted into or removed from the holder body 11 . Specifically, the determination unit 16513 acquires threshold information indicating a difference threshold for the difference value stored in the reference storage unit 16531, refers to the difference value history stored in the difference history storage unit 16522, After the difference values corresponding to the three electrodes 152A, 152B, 152C, 152D and 152E all exceed the difference threshold, only the difference values corresponding to the two electrodes 152A and 152E exceed the difference threshold and the three electrodes 152B. , 152C, and 152D are below the difference threshold. When determination unit 16513 determines that there is a period in which the difference values corresponding to electrodes 152A, 152B, 152C, 152D, and 152E indicate the history described above, card key CA is inserted into placement area A1 in holder body 11. The detection information generation unit 16514 is notified of the card insertion detection notification to notify that the card has been inserted.

On the other hand, the determination unit 16513 refers to the difference value history stored in the difference history storage unit 16522, and determines that only the difference value DA1 corresponding to the two electrodes 152A and 152E exceeds the difference threshold and the three electrodes 152B, 152C, and 152D from a state in which the difference value corresponding to is below the difference threshold to a state in which the difference values corresponding to the five electrodes 152A, 152B, 152C, 152D, and 152E all exceed the difference threshold, the five electrodes 152A, It is determined whether or not there was a period during which the difference values corresponding to 152B, 152C, 152D, and 152E all fell below the difference threshold. Then, when the determination unit 16513 determines that there is a period in which the difference values corresponding to the electrodes 152A, 152B, 152C, 152D, and 152E indicate the history described above, it notifies that the card key CA has been removed from the holder body 11. The detection information generation unit 16514 is notified of the card removal notification.

The detection information generation unit 16514 generates insertion detection information when receiving a card insertion detection notification. On the other hand, the detection information generation unit 16514 generates removal detection information when receiving a card removal notification. The detection information transmission unit 16515 transmits the insertion detection information or removal detection information generated by the detection information generation unit 16514 to the device 9 .

Next, card key detection processing executed by the control unit 165 of the card key holder 1 according to the present embodiment will be described with reference to FIGS. 6 to 8. FIG. This card key detection process is started when the card key holder 1 is powered on. First, the count value acquisition unit 16511 determines whether or not the aforementioned detection time has come (step S1). The count value acquisition unit 16511 repeats the process of step S1 as long as it determines that the detection time has not come (step S1: No). On the other hand, when the count value acquisition unit 16511 determines that the detection time has come (step S1: Yes), the count value information corresponding to the detection signal counter 1641 and the count value corresponding to the reference signal counter 1642 are obtained from the count value storage unit 16521. information is acquired (step S2). Next, the difference calculation unit 16512 calculates the difference value between the count values indicated by the two types of count value information obtained by the count value obtaining unit 16511, and stores the difference value information indicating the calculated difference value in the difference history storage unit 16522. (step S3). Subsequently, the determination unit 16513 acquires the difference value history information stored in the difference history storage unit 16522 (step S4), and determines whether or not the card key is inserted based on the acquired difference value history information ( step S5).

Here, the change history of the difference value when inserting the card key CA into the card key holder 1 will be described. For example, as shown in FIG. 7A, part of the card key CA is inserted into the card key holder 1, and the card key CA overlaps the five electrodes 152A, 152B, 152C, 152D, and 152E of the card key detection module 100. Suppose not In this case, as shown at time T11 in FIG. 8A, the difference values DA0 corresponding to the five electrodes 152A, 152B, 152C, 152D, and 152E are each maintained at a value lower than the difference threshold DAth. . In FIG. 8A, L1, L2, L3, L4, and L5 indicate time profiles of difference values corresponding to electrodes 152A, 152B, 152C, 152D, and 152E, respectively.

Next, as shown in FIG. 7B, assume that the card key CA is inserted deep into the card key holder 1 and the lower end of the card key CA overlaps the five electrodes 152A, 152B, 152C, 152D, and 152E. . At this time, the loop antenna AN1 embedded in the card key CA overlaps all five electrodes 152A, 152B, 152C, 152D, and 152E. In this case, as shown at time T12 in FIG. 8A, the difference values DA1 corresponding to the five electrodes 152A, 152B, 152C, 152D, and 152E all exceed the difference threshold DAth. After that, as shown in FIG. 7(C), it is assumed that part of the card key CA is arranged in the arrangement area A1 and the card key CA is held by the card key holder 1 . At this time, the loop antenna AN1 embedded in the card key CA overlaps only the two electrodes 152A and 152E. In this case, as shown at time T13 in FIG. 8A, only the difference value DA1 corresponding to the two electrodes 152A and 152E exceeds the difference threshold DAth, and the difference values corresponding to the three electrodes 152B, 152C and 152D DA2 falls below the difference threshold DAth. Then, as shown in FIG. 8A, for example, the determining unit 16513 refers to the history of the difference values, and determines that the difference values DA1 corresponding to the five electrodes 152A, 152B, 152C, 152D, and 152E all exceed the difference threshold value DAth. after exceeding the difference threshold DAth, only the difference value DA1 corresponding to the two electrodes 152A and 152E exceeds the difference threshold DAth, and the difference value DA2 corresponding to the three electrodes 152B, 152C, and 152D falls below the difference threshold DAth. If it is determined that there is a period of time, it is determined that the card key CA has been inserted.

Returning to FIG. 6, when the determination unit 16513 determines that the card key CA has been inserted (step S5: Yes), it notifies the detection information generation unit 16514 of the aforementioned card insertion detection notification. Then, detection information generating section 16514 generates insertion detection information when notified of the card insertion detection notification. Then, the detection information transmission unit 16515 transmits the generated insertion detection information to the device 9 (step S6). After that, the process of step S1 is executed again.

When determining that the card key CA is not inserted (step S5: No), the determination unit 16513 determines whether the card key has been removed based on the acquired difference value history information (step S7). .

Here, the change history of the difference value when the card key CA is removed from the card key holder 1 will be described. For example, as shown in FIG. 7(C), in a state where a part of the card key CA is arranged in the arrangement area A1 and the card key CA is held by the card key holder 1, as shown at time T21 in FIG. 8(B). , only the difference values corresponding to the two electrodes 152A and 152E exceed the difference threshold DAth, and the difference values corresponding to the three electrodes 152B, 152C and 152D remain below the difference threshold DAth. In FIG. 8B, L1, L2, L3, L4, and L5 indicate time profiles of difference values corresponding to electrodes 152A, 152B, 152C, 152D, and 152E, respectively. Next, when the card key CA is moved upward, the loop antenna AN1 embedded in the card key CA overlaps all of the five electrodes 152A, 152B, 152C, 152D and 152E. In this case, the difference values corresponding to the five electrodes 152A, 152B, 152C, 152D, and 152E all exceed the difference threshold DAth, as shown at time T22 in FIG. 8B. After that, when the card key CA is removed from the card key holder 1, the difference values corresponding to the five electrodes 152A, 152B, 152C, 152D, and 152E are again maintained at DA0, as shown at time T23 in FIG. 8B. state. Then, as shown in FIG. 8B, for example, the determining unit 16513 refers to the history of difference values, and determines that only the difference value DA1 corresponding to the two electrodes 152A and 152E exceeds the difference threshold value DAth for the three electrodes 152B. , 152C and 152D are below the difference threshold DAth, the difference values DA1 corresponding to the five electrodes 152A, 152B, 152C, 152D and 152E all exceed the difference threshold DAth. After that, if it is determined that there is a period in which the difference values DA1 corresponding to the five electrodes 152A, 152B, 152C, 152D, and 152E are all below the difference threshold value DAth, it is determined that the card key CA has been removed.

Returning to FIG. 6, when the determining unit 16513 determines that the card key CA has not been removed (step S7: No), the process of step S1 is executed again. On the other hand, when the determination unit 16513 determines that the card key CA has been removed (step S7: Yes), it notifies the detection information generation unit 16514 of the aforementioned card removal notification. Then, the detection information generation unit 16514 generates the removal detection information when the card removal notification is notified. Then, the detection information transmission unit 16515 transmits the generated extraction detection information to the device 9 (step S8). Subsequently, the process of step S1 is executed again.

As described above, in the card key holder 1 according to the present embodiment, the card key detection module 100 detects the capacitance between the five electrodes 152 and the object placed in the placement area A1 inside the holder body 11. Based on, it is determined whether or not the object is the card key CA. As a result, the card key detection module 100 can distinguish between, for example, the card key CA embedded with the loop antenna AN1 and other cards, so that it can accurately judge whether the object is the card key CA. can do.

Further, in the card key CA according to the present embodiment, a loop antenna AN1 made of a conductor pattern is embedded in the periphery of the card key CA. Then, the card key detection module 100 calculates the time history of the capacitance between the object and the electrode 152 when the card-shaped object is moved from the outside of the holder body 11 to the arrangement area A1 inside the holder body 11. Based on, it is determined whether or not the object is the card key CA. As a result, it is possible to determine whether or not the object is the card key CA based on the shape of the conductor pattern embedded in the object, so that the accuracy of object determination can be improved.

Furthermore, the circuit board 151 according to the present embodiment is arranged inside the holder body 11 in such a manner that the five electrodes 152 face the arrangement area A1 in the holder body 11 in the Y-axis direction. Five electrodes 152 are arranged in parallel along the X-axis direction on the front side of the circuit board 151 . As a result, it is possible to determine whether or not the object is the card key CA based on the shape of the object in the X-axis direction of the conductor pattern embedded in the card-shaped object. Accuracy can be improved.

Although the embodiments of the present invention have been described above, the present invention is not limited to the configurations of the above-described embodiments. For example, like the card key holder 2 shown in FIG. 9A, the card key detection module 2100 has three electrodes 2152A, 2152C, and 2152E arranged in parallel along the X-axis direction on the +Y direction side of the circuit board 151, Two electrodes 2152B and 2152D may be provided on both sides of the electrode 2152C in the Z-axis direction. Alternatively, like the card key holder 3 shown in FIG. 9B, the card key detection module 3100 has three electrodes 3152A, 3152C, and 3152E arranged in parallel along the X-axis direction on the +Y direction side of the circuit board 151, It may have an electrode 3152B arranged on the −Z direction side between the electrodes 3152A and 3152C and an electrode 3152D arranged on the +Z direction side between the electrodes 3152C and 3152E.

Also, like the card key holder 4 shown in FIG. 10(A), the card key detection module 4100 is provided on the +Y direction side of the circuit board 151 and has two ends extending in the Z axis direction at both ends thereof in the X axis direction. It may have elongated electrodes 4152A and 4152D and two rectangular electrodes 4152B and 4152C in parallel between the two electrodes 4152A and 4152D in the X-axis direction. Here, as shown in FIG. 10B, the electrodes 4152B and 4152C are arranged in the thickness direction of the card key CA, that is, in a state where the card key CA is partially arranged in the arrangement area A1 inside the holder body 11. , the first electrode facing the loop antenna AN1 formed of a conductor pattern in the Y-axis direction. On the other hand, the electrodes 4152A and 4152D face the outside portion of the loop antenna AN1 of the card key CA in the Y-axis direction in a state where the card key CA is partly arranged in the arrangement area A1 inside the holder body 11. It is a second electrode that does not face the loop antenna AN1.

Alternatively, like the card key holder 5 shown in FIG. 11(A), the card key detection module 5100 is provided on the +Y direction side of the circuit board 151 with two ends extending in the Z axis direction at both ends thereof in the X axis direction. Elongated electrodes 5152B and 5152D, an elongated electrode 5152C extending in the X-axis direction at the end in the −Z-axis direction, and rectangular electrodes in plan view arranged in a region surrounded by the electrodes 5152B, 5152C, and 5152D 5152A. Here, as shown in FIG. 11B, the electrode 5152A is arranged in the thickness direction of the card key CA, that is, the Y It is the first electrode facing the loop antenna AN1 formed of a conductor pattern in the axial direction. On the other hand, the electrodes 5152B, 5152C, and 5152D face the outer portion of the loop antenna AN1 of the card key CA in the Y-axis direction in a state where a part of the card key CA is arranged in the arrangement area A1 inside the holder body 11. It is a second electrode that is not facing the loop antenna AN1. A hole (not shown) for receiving infrared rays by an infrared sensor, for example, may be provided through a part of the electrode 5152A.

According to this configuration, it is not necessary to store the difference history information indicating the history of the difference value according to the shape of the conductor pattern embedded in the card key CA. Storage capacity can be reduced. In particular, in the case of card key detection modules 4100 and 5100 as shown in FIGS. The difference between the capacitance detected by the electrodes 4152B, 4152C, and 5152A facing the antenna AN1 and the capacitance detected by the electrodes 4152A, 4152D, 5152B, 5152C, and 5152D not facing the loop antenna AN1 increases. . Therefore, it is possible to improve the detection accuracy of the card key CA.

In the embodiment, the card key detection module 100 detects the capacitance between the card-shaped object and the electrode 152 when moving the card-shaped object from the outside of the holder body 11 to the arrangement area A1 inside the holder body 11. An example has been described in which it is determined whether or not the object is the card key CA based on the time history of . However, not limited to this, the card key detection module 100 detects the capacitance between the card-shaped object and each of the five electrodes 152 when the card-shaped object is placed in the placement area A1 inside the holder body 11. , it may be determined whether the object is the card key CA. For example, assume that card key detection module 100 has five electrodes 152A, 152B, 152C, 152D, and 152E arranged in parallel along the X-axis direction as described in the embodiment. In this case, the card key detection module 100 changes the difference values corresponding to the electrodes 152A and 152E to the difference values corresponding to the electrodes 152B, 152C and 152D in a state where the object is placed in the placement area A1 inside the holder body 11. If it is larger than the object, it may be determined that the object is the card key CA.

According to this configuration, it is not necessary to store the difference history information indicating the history of the difference value, so the required storage capacity of the main storage unit 1652 can be reduced accordingly.

Although the embodiments and modifications of the present invention have been described above, the present invention is not limited to these. The present invention includes appropriate combinations of the embodiments and modified examples, and appropriate modifications thereof.

INDUSTRIAL APPLICABILITY The present invention is suitable as a card key holder installed in a room of an accommodation facility.

1, 2, 3, 4, 5: card key holder, 9: device, 11: holder body, 13: base member, 16: control unit, 100, 2100, 3100, 4100, 5100: card key detection module, 111: front Cover, 111a: opening, 112: support piece, 112a: main piece, 112b: bent piece, 112c, 113a: through hole, 113: partition wall, 135, 136, 137: screw, 131: main portion, 132, 133 , 134: Rib 132a, 133a: Screw hole 151: Circuit board , 4152B, 4152C, 4152D, 5152A, 5152B, 5152C, 5152D: electrode, 161: SCF circuit, 165: control section, 1621: drive circuit, 1622: switching circuit, 1631: power supply circuit, 1632: current mirror circuit, 1633: Detection signal generation circuit 1634: Reference current generation circuit 1635: Reference signal generation circuit 1641: Detection signal counter 1642: Reference signal counter 1643: Drive signal generation circuit 1651: CPU 1652: Main storage unit 1653: Auxiliary storage unit, 1654: DTC, 1655: interface, 16511: count value acquisition unit, 16512: difference calculation unit, 16513: determination unit, 16514: detection information generation unit, 16515: detection information transmission unit, 16521: count value storage unit , 16522: difference history storage unit, 16531: reference storage unit, A1: placement area, AN1: loop antenna, C1: capacitor, CA: card key, R1: resistor, W: wall

Claims (5)

A card key holder that is installed in a room and holds a card key for unlocking a door installed at the entrance of the room,
a holder body having an arrangement area in which at least part of the card key is arranged;
A card that has at least one electrode and determines whether or not the object is the card key based on the capacitance between the object placed in the placement area and the at least one electrode. a key detection module ;
The card key has a conductor pattern embedded therein,
The card key detection module is
Based on the time history of the capacitance between the object and the at least one electrode when the object is moved from the outside of the holder body to the placement area, the object is detected by the card key. determine whether there is
card key holder. The card key detection module has a plurality of electrodes, and when at least part of the object is placed in the placement area, capacitance between the object and each of the plurality of electrodes is Determining whether the object is the card key based on
The card key holder according to claim 1 . The plurality of electrodes comprise a first electrode facing the conductor pattern in the thickness direction of the card key and a second electrode not facing the conductor pattern in a state in which at least a portion of the card key is arranged in the arrangement region. two electrodes;
The card key holder according to claim 2 . The holder body has a box shape, and an opening is provided in a part of the peripheral wall for inserting the card key into the holder body along a preset first direction,
The card key detection module has a circuit board on which the at least one electrode is arranged on one side in a thickness direction,
The circuit board is arranged inside the holder body in such a manner that the at least one electrode faces the arrangement area in a second direction orthogonal to the first direction in the arrangement area.
The card key holder according to any one of claims 1 to 3 . The card key detection module has a plurality of electrodes,
The plurality of electrodes are arranged in parallel along a direction orthogonal to the first direction and the second direction on one surface side of the circuit board,
The card key holder according to claim 4 .

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