JP3021767B2 - Wireless security device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless crime prevention apparatus capable of adjusting crime prevention sensitivity with a receiver and confirming the level of a crime prevention physical quantity detected by a detector.

[0002]

2. Description of the Related Art FIG. 7 is a block diagram showing a hot-wire detector 20 corresponding to a detector of a conventional wireless security device, and FIG. 8 is a block diagram showing a receiver 30 of the conventional wireless security device. is there.

As shown in FIG. 7, a hot-wire detector 20 is
A pyroelectric element 21 that detects a heat ray A radiated by a human body corresponding to a physical quantity for crime prevention and outputs a weak voltage according to the quantity of the heat ray A
And an amplifier 22 that amplifies the weak voltage, a comparison circuit 23 that outputs high if the output from the amplifier 22 is equal to or higher than the crime prevention determination level, and outputs 32-bit transmission data in response to the high output of the comparison circuit 23 It includes a digital processing unit 24, a transmission drive circuit 25 for modulating with transmission data and outputting it as a radio wave B, a transmission antenna 26 for radiating the radio wave B, and the like.

[0004] The 32-bit transmission data is composed of several bits of address data for identifying which hot-wire detector 20 has detected the data, one-bit security detection data, and the like. The hot-wire detector 20 includes an amplifier 22
A sensitivity setting switch (not shown) or a sensitivity setting volume (not shown) is provided so that the security detection sensitivity can be adjusted and set by changing the amplification factor of the signal or the security judgment level of the comparison circuit 23. ing.

[0005] As shown in FIG.
, A demodulation circuit 32 for demodulating the radio wave B and outputting it as a digital signal, receiving the output of the demodulation circuit 32 and performing digital processing to recognize which hot-wire detector 20 has detected security. A digital processing unit 33;
An alarm notifying unit (consisting of an alarm buzzer, a display, and a printer) 3 that receives an output from the digital processing unit 33 and notifies an alarm which of the hot-wire detectors 20 has detected crime prevention.
4 and so on. The display and the printer also display and print the date, time, minute, and second when security is detected.

Accordingly, a wireless security device including the hot-wire detector 20 and the receiver 30 can provide a security alarm for an intruder, and can also know when and where the intruder was present.

Incidentally, the hot-wire detector 20 has a detection range of an intruder that radiates the hot-wire A, and it is necessary to determine an appropriate distance and direction to a desired security position and install it on a ceiling or a wall. is there. Therefore, after the hot-wire detector 20 is installed, whether or not the hot-wire detector 20 has been properly installed is passed through a security position where a person was actually aimed at on a test basis, and an alarm was issued using a wireless security device. A detection range adjustment check (called a walk test) for checking that notification can be performed is performed.

[0008]

However, in the conventional wireless security device, the hot-wire detector 20 transmits the detection of the security to the receiver 30. Only the security detection data indicating that the data has exceeded the security determination level of the comparison circuit 23 and the address data for identifying where the hot-wire detector 20 has transmitted the data. Therefore, it is unclear what amount of input level of the heating wire A has detected the security by the hot-wire detector 20, and even if the wireless security device alerted the user with the result of the walk test, the security was detected with sufficient margin, or It is not known whether the security detection was finally completed due to lack of security detection sensitivity, and there was no false alarm (assuming that security was detected despite the absence of an intruder) and no false alarm (no security detection despite the presence of an intruder) There is a problem that there is a concern that whether or not the hot-wire detector 20 is installed so that the security detection sensitivity is high, and whether the setting of the security detection sensitivity of the hot-wire detector 20 is adjusted. .

Furthermore, if it is necessary to adjust the security detection sensitivity based on the results of the walk test, the hot wire detector 2
There is a problem that the setting of the security detection sensitivity of the hot-wire detector 20 must be adjusted by going to the installation location of 0.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. It is an object of the present invention to appropriately adjust the security detection sensitivity so as to prevent false or unreported information, and to improve the security detection sensitivity. It is an object of the present invention to provide a wireless security device which can easily adjust the settings on the receiver side.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a detector for detecting a crime prevention physical quantity and transmitting address data and analog data of the crime prevention physical quantity, and an address data transmitted by the detector. And a receiver that receives analog data and informs which detector has detected crime prevention and performs a security alarm, and the receiver has the analog data as a security judgment level. A comparison means for comparing, a security sensitivity adjustment means for variably setting the security judgment level, and the analog data confirmation means are provided.

[0012]

According to the structure described above, the detector has:
Since analog data of crime prevention physical quantity is transmitted to the receiver,
The receiver for receiving the analog data of the crime prevention physical quantity can compare the crime determination level that can be variably set by the crime prevention sensitivity adjustment means with the analog data of the crime prevention physical quantity, and the receiver can also receive the analog data of the crime prevention physical quantity. You can also check.

[0013]

1 to 6 show an embodiment of a wireless security device according to the present invention. FIG. 1 is a block diagram of a main part of a detector, FIGS. 2 and 3 are circuit diagrams of a main part of an amplifier, FIG. 4 is an explanatory diagram for explaining the output of the amplifier, FIG. 5 is an explanatory diagram for explaining the output of the analog / digital conversion circuit, and FIG. 6 is a block diagram of a main part of the receiver.

[0014] As shown in FIG. 1, a hot-wire detector 20 corresponding to the detector, outputs a weak voltage v _i which human body corresponding to the security physical quantity corresponding to the amount of heat ray A by detecting a heat ray A that emits the pyroelectric element 21, an amplifier 22 which outputs an analog voltage v _a for amplifying a fine weak voltage v _i can be input to an analog / digital converter circuit 23, an analog / digital to analog / digital conversion of the output from the amplifier 22 A conversion circuit 23, a digital processing unit 24 that receives the output of the analog / digital conversion circuit 23 and outputs 32-bit transmission data, and a transmission drive circuit 25 that modulates the transmission data and outputs it as a radio wave B. , A transmission antenna 26 for radiating a radio wave B, and the like.

The 32-bit transmission data is a few bits of address data for identifying which hot-wire detector 20 has detected the data, and an analog data corresponding to the quantity of the heat rays A corresponding to a 3-bit security physical quantity. And so on. The analog / digital converter circuit 23 of the hot-wire detector 20 is sampled by the clock signal C for sampling an analog voltage v _a corresponding to the amount of the heat ray A from the amplifier 22, binary coded decimal 3 bits data input port D ₁ of the converted to the digital processing unit _24, D _2, D ₃
(D ₁ is the upper bit, D ₃ is lower bits) to the.
The 3-bit output of the analog / digital conversion circuit 23 is also output to the NOR circuit 27, and the output of the NOR circuit 27 is input to the trigger input port T of the digital processing unit 24.

By the way, the amplifier 22 to an analog voltage v _a can enter a weak voltage v _i is the output from the pyroelectric element 21 to an analog / digital converter circuit 23, and the absolute value amplifying circuit and a differential amplifier circuit It is composed of FIG. 2 is a main circuit diagram showing the absolute value amplifier circuit, and FIG. 3 is a main circuit diagram showing the differential amplifier circuit.

First, the connection relationship of the absolute value amplifier circuit shown in FIG. 2 will be described. V _i is the input terminal of the absolute value amplifying circuit being input weak voltage v _i is the output from the pyroelectric element 21, the input terminal V _i is connected to one of Condesa C _1, the other Condesa C ₁ is while the are connected to respective resistors R ₁ and R _3. The other of the resistor R ₁ is an operational amplifier 2
Inverting input terminal of the 2 _a, one and the diode D of the resistor R _2
2 cathodes. The other of the resistor R ₂ is connected to the anode of one and the diode D ₁ of the resistor R _4, the cathode and the diode of the diode D ₁ D ₂
The anode is connected to the output of the operational amplifier 22 _a, respectively.

Further, the other resistor R ₄ is connected to one Condesa C _2, the other Condesa C ₂ is an operational amplifier 22 _b
Connected to the inverting input terminal. Furthermore, the operational amplifier 22
The _b-inverting input terminal of one of which is connected to the other and a resistor R ₅ of the resistor R _3, the other of the resistor R ₅ are form an output terminal V _o of the absolute value amplifying circuit connected to the output of the operational amplifier 22 _b I have. Then, the operational amplifier _22a and the operational amplifier 22
The non-inverting input terminal of _b, respectively operational amplifiers 22 _a and the operational amplifier 22 _b of the power supply voltage V _cc of the half of the voltage V _cc /
2 has been entered.

Next, the connection relationship of the differential amplifier circuit shown in FIG. 3 will be described. V _o shown in FIG. 3 is an input terminal of the differential amplifier circuit is connected to the output terminal V _o of the absolute value amplifying circuit shown in FIG. Then, the input terminal V _o of the differential amplifier circuit is connected to one resistor R _8, the other resistor R ₈ is connected to one of the non-inverting input terminal and the resistor R ₉ of the operational amplifier 22 _c, the other of the resistor R ₉ Is grounded. Further, to the inverting input terminal of the operational amplifier 22 _c one of one and a resistor R ₇ of the resistor R ₆ is connected to the output terminal V of the other resistor R ₇ is connected to the output of the operational amplifier 22 _c differential amplifier circuit _a is formed. Then, half of the voltage V of the power supply voltage V _cc of the other in the operational amplifier 22 _c of the resistor R _{6 cc} / 2
Is entered.

In the absolute value amplifier circuit shown in FIG. 2, the values of the resistors R _1, R _2, R _{3, and} R ₄ are respectively represented by r _1,
When r _2, r _{3, and} r ₄ are set, the resistance values are set so that the expression (1) is satisfied. In the differential amplifier circuit shown in FIG. 3, the respective resistors R _6, R _7, R _8, R The values of ₉ are r _6, r _7, r _8,
When r ₉ is set, the resistance value is set so that the expression (2) is satisfied.

R ₂ / (r ₁ r ₄ ) = 2 / r ₃ (1) r ₆ = r ₈ , r ₇ = r ₉ ... (2) The operation of the absolute value amplifier circuit shown in FIG. 2 and the differential amplifier circuit shown in FIG. 3 will be described with reference to FIG. 4 for explaining the output of each section of the amplifier 22.

FIG. 4A shows the fine output of the pyroelectric element 21.
Weak voltage v_iFIG. 4B is a voltage waveform showing
Output terminal V of the absolute value amplifier circuit shown in FIG._oOutput voltage v_oTo
FIG. 4C shows the voltage waveforms shown in FIG.
Output voltage v of width circuit_aFIG. In addition, vertical
The potential axis is taken in the direction and the time axis is taken in the horizontal direction. _cc
Indicates a power supply potential, and V_cc/ 2 is half the power supply potential
And GND indicates a ground potential.

Due to the characteristics of the pyroelectric element 21, when a human body that emits a heat ray A corresponding to a physical quantity for crime prevention passes through the detection range of the intruder of the hot-wire detector 20 (also referred to as the detection range of the pyroelectric element 21). outputs a weak voltage v _i shown in FIG. 4 (a). In other words, weak voltage v _i is indicate voltage waveforms of amplitude potential V _cc / 2 as a reference. This is because the pyroelectric element 21 detects a change in the amount of the heat ray A. Then, the maximum value v of the weak voltage v _i is a security detector
better to detect an intruder in _{i (MAX)} and a weak voltage v _i minimum v _i of _(MIN) is more reliable.

[0024] Therefore, a smaller number of bits, the maximum value of the weak voltage v _i v _{i (MAX)} and a weak voltage v _i minimum v in
_{In order to} convert the information of _{i (MIN)} into analog data corresponding to the amount of the heat ray A corresponding to the crime prevention physical quantity by the analog / digital conversion circuit 23, the weakness shown in FIG. voltage v _i potential as shown in FIG. 4 (B) by the absolute value amplifier circuit shown in FIG. 2 the V _cc / 2 or less weak voltage v _i a potential V _cc / 2 output voltage v _o, which is inverted relative to the The output voltage _vo of the absolute value amplifying circuit in the differential amplifier shown in FIG.
minus the potential V _cc / 2 from _o with each other to the output voltage v _a of the differential amplifier circuit as shown in (C) of (potential V _cc / 2 only shifted to the ground potential) FIG.

That is, in the absolute value amplifier circuit shown in FIG.
When the potential of the connection point P ₁ with weak voltage v _i is input to the input terminal V _i is equal to or higher than the potential at the connection point P _2, the diode D ₁ is turned on diode D ₂ is turned off. Therefore, in this case,
When the output voltage of the connection point P ₃ and v _P3 (3) and equation (4) is established.

[0026] _{v P3 = - (r 2 /} r 1) v i ............................................. (3) v o = - (r 5 / r 3) v i - (r ₅ / r ₄ ) v _P3 (4) By substituting equation (3) into equation (4), equation (5) holds.

[0027] _{v o = - (r 5 /} r 3) v i - (r 5 / r 4) {- (r 2 / r 1) v i} = -r 5 v i (1 / r 3 -r 2 / R ₁ r ₄ ) (5) By substituting equation (1) into equation (5), equation (6) holds.

[0028] _{v o = -r 5 v i (} 1 / r 3 -2 / r 3) = (r 5 / r 3) v i ............................................. (6) the connection point is input to the weak voltage v _i is the input terminal V _i P
When _first potential is made below the potential at the connection point P _2, the diode D ₁ is turned off and the diode D ₂ is turned on. Therefore, in this case, when the output voltage of the connection point P ₃ and v _P3 (7) and Formula (8) is established.

[0029] _{v P3 = 0 .................................................................. (7)} v o = - (r 5 / r 3) (- v i) - ( _{r 5 / r 4) v P3} ... (8) (7) (8) (9) equation by substituting the expression expression is established.

V _o = (r ₅ / r ₃ ) v _i (9) where v _i , v _P3 , and v _P3 in the equations (3) to (9). _vo represents a change.

Then, the operational amplifier 22_bNon-inverting input terminal
Potential V_cc/ 2 bias voltage is input
And the output voltage v of the absolute value amplifier circuit including the DC component
_oIs the weak voltage v_iIs the input terminal V_iTo the connection point P
₁Potential of the connection point P_TwoEven when the potential is higher than
v_iIs the input terminal V_iTo the connection point P₁Potential is connected
Point P _TwoOutput voltage of the absolute value amplifying circuit
Pressure v_oIs expressed by equation (10).

[0032] _{v o = (r 5 / r} 3) v i + V cc / 2 .............................. (10) the output voltage v of the absolute value amplifying circuit shown in this equation (10)
_o is input to the input terminal V _o of the differential amplifier circuit shown in FIG. 3, and in this differential amplifier circuit, the potential V _cc / 2 is applied to one of the resistors R _{6 according to} the relationship of the equation (2). since it is, the output voltage v _a at the output terminal V _a of the differential amplifier shown in (11), i.e. with a shift from the output voltage v _o of the absolute value amplifying circuit potential V _cc / 2 to the ground potential, the shifted output voltage v _a where the voltage was ₆ times r ₇ / r outputs.

[0033] _{v a = (r 5 r 7} / r 3 r 6) v i .............................. (11) Then, the output voltage v _a is input to the analog / digital converter circuit 23 Because This concludes the description of the operations of the absolute value amplifier circuit shown in FIG. 2 and the differential amplifier circuit shown in FIG.

Next, the analog / digital conversion shown in FIG.
Analog / digital conversion circuit 23 corresponding to
With respect to the digital processing unit 24, the state of the analog / digital conversion and the operation status of the digital processing unit 24 will be described with reference to the explanatory diagram for explaining the output of the analog / digital conversion circuit 23. Support to v _a in FIG. 5 shows the output voltage v _a of the output terminal V _a of the differential amplifier circuit shown in FIG. Also,
V _1, V _2, V ₃ are each a reference voltage to the quantization of the input voltage of the analog / digital converter 23, D _1,
D ₂ and D ₃ are analog / digital conversion circuits 23, respectively.
Shows the bit of the output of the, D ₁ is the upper bit D ₃ is made in a low-order bit.

The analog / digital conversion circuit 23
Has the following input / output relationship. That is, when the input voltage is less than the quantization reference voltages V ₁ output bit D _1,
The value of "0" to the D _2, D ₃ is output in binary coded decimal "1" when the input voltage is less than the quantization reference voltages V ₁ or V ₂ is the output bit D _1, D _2, D ₃ value is output in binary coded decimal, when the input voltage is less than the quantization reference voltage V ₂ or V ₃ is output bits D _1, D _2, the value 2 evolution "2" to D ₃ 1
Is output in the 0 binary, the input voltage is made to be outputted by the value binary coded decimal number "3" in the case of more than the quantization reference voltage V ₃ output bits D _1, D _2, D _3.

[0036] In the illustration shown in FIG. 5, the sampling period of the analog / digital converter circuit 23 is made rough, the actual is sampled at high speed, the maximum value V _a of the output voltage v _a of the differential amplifier circuit _(MAX) can be almost picked up. The binary-coded decimal value of the output bits D _1, D _{2, and} D ₃ that are sequentially converted from analog to digital is:
Data input ports D1 _, D2 _, D of the digital processing unit 24
₃ (D ₁ is the upper bit, D ₃ is the lower bit) is output to the NOR circuit 27 is output to.

Therefore, when the binary-coded decimal value of the output bits D _1, D _{2, and} D ₃ is not “0”, the output of the NOR circuit 27 sets the trigger input port T of the digital processing unit 24 to Low and outputs When the binary-coded decimal value of the bits D _1, D _{2, and} D ₃ is “0”, the output of the NOR circuit 27 sets the trigger input port T of the digital processing unit 24 to High.

When the trigger input port T is high, the digital processing section 24 outputs data input ports D _1, D _2, D
Ignore the value of ₃ . However, when the trigger input port T is Low
The digital processing for selecting the maximum value of the binary coded decimal number input to the data input ports D _1, D _2, D ₃ within a fixed time T _t (several seconds) including this time point is performed. The value (D ₁ = 0, D ₂ = 1, D ₃ = 1 in the case of FIG. 5) and the address of the hot-wire detector 20 are output to the transmission drive circuit 25 as a predetermined 32-bit transmission data format, The transmission drive circuit 25 modulates the data with the transmission data so that the data can be output as a radio wave B and outputs the radio wave B to the transmission antenna 26. The transmission antenna 26 radiates the radio wave B. Then, the digital processing unit 24 sets the trigger input port T again.
Wait for Low and wait.

Therefore, as described above, a certain period of time (several seconds) T including the time when the trigger input port T goes low
_Since only the maximum value of the binary coded decimal number input to the data input ports D _1, D _{2, and} D ₃ within _t is selected and output as the radio wave B, the radio wave B is always continuously transmitted from the transmission antenna 26. There is no need to output the power, and less power is required for transmitting the radio wave B. Further, the hot-wire detector 20 having a specific address does not use the radio wave B exclusively.

The receiver 30 shown in FIG. 6 includes a receiving antenna 31 for receiving the radio wave B, a demodulation circuit 32 for demodulating the radio wave B and outputting it as a digital signal, and receiving the output of the demodulation circuit 32 for digital processing. A digital processing unit 33 for recognizing whether or not the hot-wire detector 20 has detected security, and an alarm notifying unit for receiving an output of the digital processing unit 33 and notifying which of the hot-wire detectors 20 has detected security. An alarm buzzer, display and printer) 34;
Storage circuit 3 for storing a comparison value corresponding to the security judgment level
5 and an operation unit that variably sets the comparison value stored in the storage circuit 35 and instructs the digital processing unit 33 to display and print the comparison value and the analog data on a display or printer of the alarm notification unit 34. 36.

Therefore, the receiver 30 receives the radio wave B with the receiving antenna 31 and the demodulation circuit 32 converts the radio wave B into a digital signal of a predetermined format of 32 bits.
Output to The digital processing unit 33 recognizes an address from a digital signal of a predetermined format of 32 bits,
The comparison value of this address is selected and extracted from the storage circuit 35, and the comparison value and the maximum value within a predetermined time _Tt corresponding to analog data included in a 32-bit digital signal in a predetermined format (in the case of FIG. 5, D ₁ = 0, D ₂ =
1, D ₃ = 1) and a maximum value within a certain time _Tt corresponding to analog data (D ₁ = 0, D ₁ = 0, in the case of FIG. 5).
D ₂ = 1, D ₃ = 1) is greater than or equal to the comparison value,
The comparison value, the analog data, the address, and the date, time, minute, and second at which security was detected are displayed and printed on the display or printer of the alarm notification unit 34.

Accordingly, in the receiver 30, the digital processing section 33 corresponds to the comparison means, the operation section 36 corresponds to the security sensitivity adjustment means, and the display and printer of the alarm notification section 34 correspond to the analog data confirmation means. Would be equivalent.

Therefore, in the walk test, the hot-wire detector 2
When a wireless security device having a security alarm and a receiver 30 generates a security alarm, analog data of the security physical quantity detected by the hot-wire detector 20 from the display of the display of the alarm notification unit 34 and the display / printing of the printer and the storage circuit 35 And the comparison value of. In other words, appropriate security detection without false alarms (assuming that security is detected despite the absence of an intruder) or unreported (no security detection despite the presence of an intruder) due to insufficient security detection sensitivity or excessive security detection sensitivity It is possible to know whether or not the sensitivity has been reached.

Therefore, if the security detection sensitivity is insufficient or the security detection sensitivity is excessive, the comparison value of the storage circuit 35 may be variably set by designating an address from the operation unit 36 of the receiver 30.

[0045]

Wireless type security device of the present invention exhibits, because one that is constructed as described above, Ya false alarm at the receiver
Adjustable security detection sensitivity appropriately and easily so that there is no false alarm
Function, and the detector always transmits data continuously.
Since there is no need to output radio waves from the
This provides an effect that a wireless security device that requires less power can be provided.

[Brief description of the drawings]

FIG. 1 is a main block diagram showing a detector of a wireless security device according to one embodiment of the present invention.

FIG. 2 is a main part circuit diagram showing an absolute value amplifying circuit of a detector of the wireless security device according to one embodiment of the present invention.

FIG. 3 is a main part circuit diagram showing a differential amplifier circuit of the detector of the wireless security device according to one embodiment of the present invention.

FIG. 4 is an explanatory diagram of an output voltage waveform for explaining the operation of the amplifier of the detector of the wireless security device according to the embodiment of the present invention;

FIG. 5 is an explanatory diagram for explaining an output of an analog / digital conversion circuit of a detector of the wireless security device according to one embodiment of the present invention;

FIG. 6 is a main block diagram showing a receiver of the wireless security device according to one embodiment of the present invention.

FIG. 7 is a main block diagram showing a detector of a conventional wireless security device.

FIG. 8 is a main block diagram showing a receiver of a conventional wireless security device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 Detector 30 Receiver 33 Comparison means 34 Analog data confirmation means 36 Security sensitivity adjustment means A Security physical quantity

Claims (1)

(57) [Claims] 1. A detector for detecting a crime prevention physical quantity and transmitting address data and analog data of the crime prevention physical quantity, and one of the detectors receiving the address data and the analog data transmitted by the detector detects a crime prevention. a wireless-type security device and a receiver for performing security alarm to notify whether the, the detector, the security physical quantity detected a predetermined time
An analog that performs digital conversion and outputs the maximum value after conversion
A log / digital conversion means is provided, and the receiver is provided with a comparison means for comparing the analog data with a security judgment level, a security sensitivity adjusting means for variably setting the security judgment level, and the analog data confirmation means. Wireless security device.