JPS59228185A - Detector - Google Patents

Abstract

PURPOSE:To always maintain a fixed level over all alarting areas by automatically adjusting the detection sensitivity according to the inclination of the alarting zone of a detector. CONSTITUTION:A detector 11 mounted on a ceiling surface 10 has a condenser mirror 16 supported rotatably with an arm 15 formed on the undersurface of a frame body 12 and a rotary switch 18. The condenser mirror 16 is rotated by turning a knob 25 to alter the inclination of an alerting zone to beta from alpha while the angle of rotation of the mirror 16 is detected with the rotary switch 18 and fed to a printed circuit board 26. As the alerting zone 2 is switched to 3 from 2, the zone dimensions change to B from A and according to this, the amplification factor of a processing circuit of the printed circuit board 26 or the reference voltage of a comparator are changed with the rotary switch 18 to ensure a fixed detection sensitivity.

Description

[Detailed Description of the Invention] This invention is a device that is installed on the wall or ceiling of a room or hallway, and detects and notifies when someone illegally enters the room or hallway. It relates to a sensitivity adjustment device that automatically switches the detection sensitivity of a detector that is installed to detect and notify when a fire occurs within a warning range. Even if the detector's warning range is changed or the detector's installation location is changed and the dimensions of the target zone change, it will not be necessary to respond to this change. The present invention relates to a detector whose detection history is always optimized to output a reliable alarm.

The radiant energy detector, which is one of the devices that detects and alerts when someone illegally enters a room or hallway, uses a condensing mirror to collect all of the heat rays in the Hokai area, and also collects the heat rays here. A sensor (for example, a pyroelectric detector) converts the heat rays into an electrical signal, which is then processed by a processing circuit to detect when someone enters the dining area, and send it to the monitor. The system is configured to notify this information.

By the way, in such a detector, as shown in Fig. 1, the angle of the condensing mirror of the detector 1 is adjusted, and the slope of the warning zone is changed from the slope α to the slope β, so that the warning T area can be adjusted. When switching from the total distance force to directly below, the warning zone dimension changes from dimension A to dimension B correspondingly, so the detection sensitivity improves in warning zone 3, and the energy strength/false which is the detection sensitivity is the square of the distance. Even if the same heat source 4 enters these zones 72 and 3, the field of view is inversely proportional to the heat source 4 from the solid angle of each warning zone 2 and 3.
The amount by which the solid angle is reduced (detection sensitivity) will change, and depending on the background temperature and the history of the heat source 40 passing speed, there is a risk that an alarm will be issued when a small animal (such as a mouse) enters. be. On the other hand, if the slope of the guard zone is changed from the slope β to the slope σ, the detection sensitivity decreases, and there is a possibility that an intruder may not be detected even though he is in the guard area.

In view of the above points, this invention automatically changes the detection sensitivity when the warning area is changed by changing the angle of the condensing mirror that collects alarm events, so that the detection sensitivity is always kept at a predetermined level. The object of the present invention is to provide a detector that can maintain detection sensitivity and generate a reliable alarm without being affected by changes in the field of view.

In order to achieve this purpose, in the detector according to the present invention, the amplification level or A feature of this system is that the reference voltage (set value) of the comparator placed after the amplifier (after the processing circuit) can be changed using a rotary switch, a variable resistor, etc.

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 2 is a partial sectional view showing an example of a detector according to the present invention. In this figure, numeral 11 is a detector attached to the ceiling (or wall) 10 of the warning area.
When a person or the like intrudes into a security area, a detector 11 detects this and notifies a monitor circuit (not shown) of the presence of an intruder. More specifically, the detector 11 includes a disc-shaped frame 12, a plate 13 for attaching the frame 12 to the ceiling surface 10, and a glob-shaped frame attached to the lower part of the frame 12. A condenser mirror 1 is rotatably supported by a cover 14 and an arm 15 formed on the lower surface of the frame 12.
6, a rotary switch 18 whose rotation axis is attached to the shaft 17 of the condensing mirror 16, a first gear 19 coaxially provided to the shaft 17, and a second gear meshed with the temple gear 19. 20, and a drive shaft 22 that is rotatably housed in a through hole 2 formed in the frame 12 and has one end connected to the second gear 20. After inserting the shaft 24 of the angle adjustment jig 23 into the through hole 21 of No. 11 and completely fitting the tip of this shaft 24 with the other end of the T drive shaft 22, turn the knob 25. Correspondingly, the condensing mirror 16 rotates, and the rotation angle of the condensing mirror 16 at this time is detected by a rotary switch 18 and supplied to a printed circuit board (circuit) 26 attached to the lower surface of the frame 12. be done. This printed circuit board 26 will be described below with reference to FIG. 3.
The circuit formed above will be explained.

In this figure, reference numeral 3o denotes a pyroelectric detector 31 that converts the heat rays collected by the condensing mirror 16 into electrical signals.
The signal amplified by the preamplifier 3o is supplied to the amplification processing circuit 32. The amplification processing circuit 32 further increases the output of the preamplifier 3o and performs predetermined processing such as frequency discrimination on the amplification result. Voltage) Vf
When the value is higher than the reference level V'f, the comparator 33 sends a "1" signal (binary logic level "1") to the alarm signal generation circuit (notification circuit) 34 indicating the presence of an intruder.
signal) is supplied, and an alarm signal (for example, a contact signal) is output from there to a monitor circuit (not shown).

On the other hand, the rotary switch 18 has its common contact 35
．． 36 is a short type rotary switch connected to the power supply +V, and when the angle of the condensing mirror 16 changes, the slide lower piece 37 changes accordingly.
moves and the contacts 38 to 4 are located at a position corresponding to this angle.
3 outputs voltage element V. That is, when the detector 11 is installed on the ceiling and the horizontal direction is alerted, the slide piece 37 of the rotary switch 18 comes into contact with the contact point 38, and from this state the alert range is sequentially moved downward in the direction A1.
In response to this, this slide piece 37 contacts the contacts 3'9 and 40.
If the detector 11 is similarly placed on the wall and alerted in the horizontal direction, the slide piece 37 will come into contact with the contact 41, and from this state, if the alert range is sequentially tilted toward the ceiling (or toward the floor), Accordingly, this slide piece 37 sequentially contacts the contacts 42 and 43, and the voltage +V obtained at these contacts 38 to 4o and contacts 41 to 43 corresponds to the dirt circuit 45 for the ceiling and the gate circuit for the wall. 46. The dart circuit 45 connects resistors 47 to 49 and an inverter 5.
0.51, AND ゜-, 52゜53, and driver 5
4 to 56, and its first input terminal 45
If the P1” signal (voltage V) is supplied to a, the first
If the drive current il is output from the output terminal 45d and the "1" signal is supplied to the second input terminal 45b, the first output While stopping the output from the terminal 45d, the drive current 12 is output from the second output terminal 45e, and the 1" boost Kl is stopped at the third input terminal 45'c, and the third output terminal The drive current 13 is output from 45f and supplied to the corresponding coils 57 to 59, respectively. The coils 57 to 59 each have diodes 60 to 62 connected in parallel, and when the drive current 11 is output from the dart circuit 45, the coil 57 is activated and the corresponding normal Open contact 57a''i is closed,
Similarly, when the driving current 12 or the driving current i3 is output, the corresponding coils 58, 59 are activated, and the normally open contacts 58a, 59a:i are respectively closed. One end of each of the contacts 57a to 59a is connected in common, and this common connection point P1 is connected to the power supply V through a resistor 60, and each other end is connected to the power supply V through a corresponding resistor 61 to 63. This common connection point P2 is connected to the ground through a variable resistor 64 and a resistor 65 in series, and the output of the dirt circuit 45 causes any one of these contacts 57a to 59a to be in a closed state. to generate a voltage at the connection point P2. That is,
If the dart circuit 45 outputs one of the drive currents 111'2+13, the common connection point P corresponds to this.
A voltage v1°V2- is applied to the connection point P3 between 2 and the variable resistor 64.
■x (V+ < V2 < V3) force is generated,
This is supplied to the comparator 33 as the reference voltage Vf.

Further, the dirt circuit 46 for the wall has resistors 67 to 69 like the gate circuit 45 for the ceiling. Inverter 70,7
1, AND gate 72, 73. Drivers 74-76
The signals supplied to the first input terminal 46a to the third input terminal 46c are input to the third input terminal 46c>.
The second input terminal 46b is encoded with priority in the order of the first input terminal 46a, and the first output terminal 46d~
A drive current i is output from any one of the third output terminals 46f, and this drive current i is used to operate any one of the coils 80 to 82 to which diodes 77 to 79 are respectively connected in parallel. Point j (A contacts 80a to 8
2a)) is closed. Like the contacts 57a to 59a described above, each of the contacts 80a to 82a has one end connected to the power supply +V via a resistor 83, and the other ends thereof are commonly connected via each resistor 84 to 86. a
n, this common connection point P4 is connected to the connection point P3. Therefore, when the rotary switch 18 is turned and its slide piece 37 contacts only the contact 41, the gate circuit 4'6 activates the coil 80, closes the contact 80a, and connects the connection point P3. Generate voltage V4. Similarly, if the slide piece 37 is in contact with the contact 42 or the contact 43.

One of the contacts 81a and 82a is generated at the output of the gate circuit 46, and this is supplied to the comparator 33 as the reference voltage f.

On the other hand, the variable resistor 64 is mounted in the same manner as the angle adjustment jig 23 and is adjusted by a height adjustment jig 89, and this jig 89 is used for detection 1. , vessel 1
1 and turn the knob 90 of this jig 89, the resistance value of the variable resistor 64 changes accordingly, and the connection point P
3, the value of the d pressure generated changes. Therefore, by turning the knob 90 and setting the variable resistor 464 to a value corresponding to the height at which the detector 11 is mounted, a voltage corresponding to the height can be obtained at the connection point P3.

As described above, in this embodiment, when the detector 11 is mounted on the ceiling and the angle of the corner mirror 16 of the detector 11 is changed to change the warning range from far to near,
The reference voltage Vf O supplied to the comparator 33 in accordance with this
The value of the reference voltage Vf increases step by step, and if you change the warning range from far to near with several pieces of this detector 1 mounted on a wall, etc., the value of the reference voltage Vf increases step by step, as in the case described above. Since the field of view is made to have a high height, it is possible to notify when a person or the like is illegally intruding without being affected by the field of view, and it is also possible to prevent false alarms from being caused by small animals or the like. Furthermore, in this embodiment, the mounting of the detector 11 is determined by the height, for example, if several detectors 11 are installed on the ceiling, the height from the floor to the ceiling, or if this one detector 11 is installed on the wall. Since the value of the variable resistor 64 is set according to the height from the floor to the detector 11 when the sensor 11 is installed in A reliable warning can be issued.

FIG. 4 is a circuit diagram showing a second embodiment of the present invention,
In this figure, parts corresponding to those in FIG. 3 are given the same reference numerals. The circuit shown in this figure is different from the circuit shown in FIG.
One end of each of contacts 80a to 82a controlled by coils 80 to 82 is connected to one control terminal 32a of gold amplification processing circuit 32, and the contacts 57a to 5 are connected to one control terminal 32a of gold amplification processing circuit 32.
Resistors 6 corresponding to each other end x<b of 9a, 80a to 82a
1 to 63, 84 to 86' (connected to the other control terminal 32b of the amplification processing circuit 32 via il-, and further connected to the terminal on the connection point P3 side of the variable resistor 64 via the resistor 92 to the power supply +
V, and each contact 57a to 59a, 8
When any one of 0a to 82a is closed, a corresponding resistor (any one of resistors 61 to 63, 84 to 86) is inserted between the control terminals 32a and 32b, and the amplification processing circuit 32 The amplification degree of is set to a value corresponding to the value of this resistance. In this way, in this circuit, the detector 11
When the angle of the condensing mirror 16 is changed, the amplification degree of the amplification processing circuit 32 that processes the output of the preamplifier 30 changes accordingly, and a signal corresponding to this amplification degree is supplied to the comparator 33. , where the reference voltage V obtained at the connection point P3
f and the result of this determination is output from the alarm signal generation circuit 34, so as in the first embodiment described above, any failure in the visual field due to changes in the amount of visual field defects can be completely prevented and a reliable alarm can be generated. Axis signals can be output.

In each of the embodiments described above, each of the contacts 57a to 59
a, the reference voltage Vf by switching the connection state of 80a to 82a.
The O value or the amplification degree of the amplification processing circuit 32 is changed, but these contacts 57a to 59a, 80a to 82
A similar effect can be obtained by using an analog switch instead of a.

FIG. 5 is a circuit diagram showing a third embodiment of the invention. In this figure, reference numeral 95 is an encoder that detects the angle of the condensing mirror 16 (see FIG. 2) and outputs the detected angle as a parallel signal (parallel data).
When the is mounted on the ceiling to perform a warning operation, the first output terminals 95a to 3rd output terminals 95c are connected to the first parallel connection 1d corresponding to the angle of the converging mirror at this time.
11n, “011”, “001” (voltage is +V)
If the detector 11i is mounted on a wall and used for warning operation, the fourth output terminal 95d~
Second parallel signals "l 11" and "011" corresponding to the condensing mirror angle at this time are output from the sixth output terminal 95f.

°Output either “001”. That is, as shown in FIG. 6, this encoder 95 has a shaft 96 connected to the shaft 17 of the condensing mirror 16, a disc 97 coaxially attached to this shaft 96, and a disc 97 formed on this disc 97. Is it for the ceiling? Turns 98 and patterns 99 for walls and blanks 100.10 arranged in contact with said disk 97
1.102a to 102f, lead wires 103 and 104 that lead the voltage +V applied to the voltage input terminal 95g to the brushes 100 and 101, and the brushes 1'02a to 10.
The voltage obtained at 2f is applied to each of the corresponding output terminals 95a to 95.
The encoder 95 has a lead wire 105a=105f leading to the output terminal 95a to 95f.
As shown in FIG. 5, f is connected at a common connection point P6 through each of the resistors 106 to ll'i, and this common connection point P6 is grounded through a variable resistor 64 and a resistor 65 in series. There is.

However, even in this embodiment, if the detector 1 is placed several times on the ceiling or wall and the angle of the condensing mirror 1.6 km is adjusted,
According to the angle of this condensing mirror 16, the common connection point P6
When the reading point P3+ is in contact with the variable resistor 64, the voltage obtained changes and the reference voltage Vf supplied to the comparator 33 corresponds to the amount of visual field loss at this time.
A reliable alarm signal can be output without being affected by the angle of the sensor.

FIG. 7 is a circuit diagram showing a fourth embodiment of the invention. The circuit shown in this figure is configured to vary the value of the reference voltage Vf supplied to the comparator 33 by a variable resistor 115 connected to the axis 17 of the condensing mirror 16. A parallel circuit 119 consisting of a coil 117 and a diode 118 is controlled by the output of a rotary switch 116 connected to the rotary switch 116 to open and close the contact 117a, and the condensing mirror of the detector 11 (see FIG. 2) -16 When set to the full ceiling position, a voltage of 10 V is output from the rotary switch 116 and the contact 117a is closed, and when the collector mirror 16 of the detector 11 is set to the wall position, a voltage of +V is output from the rotary switch 116. The contact 117a is made to be in an open state by preventing the output of the contact 117a. Therefore, this detector 1
1 is mounted on the ceiling and the condensing mirror 16' (i- is inserted between the variable resistor 115 and the power supply +V: tt). A resistor 1'20 is inserted in parallel to the condensing mirror 16' At the same time, the variable resistor 115 is changed so that the value of the variable resistor 115 becomes a value corresponding to the angle of the condensing mirror at this time.
6 to the desired angle, the resistor 120 becomes the resistor 1]8
At the same time, the value of the variable resistor 115 becomes a value corresponding to the angle of the condensing mirror 16. Therefore, the comparator 33 has the optimum reference voltage Vf depending on the location and warning range when the detector 11 is installed. is supplied.

Even if the value of the reference voltage Vf supplied to the comparator 33 is changed using the variable resistor 115 in this way, the same effects as in each of the embodiments described above can be obtained.

ifc In these third and fourth embodiments, the comparator 33
The criterion for "L pressure Vf i is changed to correspond to the change in the amount of visual field loss of the detector J1, but this can also be done by changing the amplification level of the amplification processing circuit 32 as in the second embodiment. good.

In the fourth embodiment of the Ox Octopus and in each of the above-mentioned embodiments, a rotary switch or an encoder is used to switch between the ceiling mode and the wall mode. All the same effects as those of the above-mentioned embodiments can be obtained even by using a switching device such as a switch.

In each of the embodiments described above, either the amplification process, the amplification degree of the J path 32, or the reference voltage Vf of the comparator 33 is changed, but it is also possible to change both of these. .

As explained above, the detector according to the present invention detects, for example, the angle of the condensing mirror and processes the amplification degree of the amplification processing circuit that processes the output of the sensor according to the detection result or the output of this amplification processing circuit. In addition to changing the reference voltage of the comparator, the amplification degree or reference ′+[pressure is also changed as needed in response to changes in the height of the detector, so the angle of the focusing mirror of the detector can be changed. Moreover, when this detector is installed, if the warning area changes due to changing the position, the detection sensitivity can be automatically changed accordingly. Despite changes, it can always maintain a certain level of sensitivity, making it easy to identify whether something entering the warning area is a person or a small animal such as a mouse, and eliminating malfunctions. There is no longer any fear of misreporting.

[Brief explanation of drawings]

Fig. 1 is a side view showing the relationship between the condensing mirror angle of the detector and its warning zone, Fig. 2 is a partial sectional view showing an example of the configuration of the detector according to the present invention, and Fig. 3 is an application of the present invention. FIG. 4 is a circuit diagram showing a second embodiment of a detector to which this invention is applied, and FIG. 5 is a third embodiment of a detector to which this invention is applied. A circuit diagram showing,
FIG. 6 is a perspective view showing an example of an encoder used in this third embodiment, and FIG. 7 is a circuit diagram showing a fourth embodiment of a detector to which the present invention is applied. 11... Detector, 16-... Condensing mirror, 18... Rotary switch (sensitivity switch), 31 - Pyroelectric detector (sensor), 32... Amplification processing circuit (processing circuit), 33
...Comparator (processing circuit), 34...-1 signal generation circuit (notification circuit), 45.46...8-gate circuit (sensitivity switch), 64...Variable resistor (sensitivity switch) , 95. Encoder (g degree switch), 115... Variable resistor (sensitivity switch). Patent applicant: Chino Seisakusho Co., Ltd. Japan Security Insurance Co., Ltd.

Claims (1)

[Claims] 1. A sensor that detects an alarm event converts it into an electrical signal and supplies it to a processing circuit, and the processing circuit amplifies the entire output of the sensor to obtain a value and a preset setting. In the detector which compares all values with the value and outputs the comparison result via the notification circuit, the detector is configured to change at least one of the amplification degree or the set value of the processing circuit in conjunction with the slope of the warning zone of the detector. A detector comprising a sensitivity 1jJ variable means, and the sensitivity of the processing circuit is varied by the output of the sensitivity variable means. 2. The sensitivity or = means is provided with a sensitivity switcher that is variable depending on the installation location of the detector body, and the output of the sensitivity switcher changes at least one of the amplification degree or the set value of the processing circuit to the alarm of the detector. 2. The detector according to claim 1, wherein the detector is variable in conjunction with the angle of the zone.