JPS60181636A - Beam type detector - Google Patents

Abstract

PURPOSE:To enable the inspection and adjustment without disturbing other fire sensors connected to the same circuit in a separation type smoke detector by providing a circuit for selecting the detection sensitivity on a light receiving section for detecting light from a light emitting section to prohibit the detection of light during the adjustment of the equipment. CONSTITUTION:A power source/fire signal line L1 and a common line L3 are connected from a receiver 1 to a light receiving section 2 and a fire sensor 5. A inspection signal line L2 is connected to the light receiving section 2. Then, light emitting signal lines L4 and L5 are connected to a light emitting section 3 separated at a specified distance (about 15m) from the light receiving section 2 and smoke is sensed in the detection area 4 by light emitted from a light emitting element 3a to be received by a light receiving element 2a. In addition, a circuit for selecting the light detection sensitivity on the light receiving section 2 to control the sensitivity. The detection of light is controlled with the light receiving section 2 to generate no signal while the optical axis is adjusted for the light emitting section 3 and the light receiving section 2. Thus, inspection and adjustment can be performed without disturbing other fire sensors connected to the same circuit.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is such that a light emitting part and a light receiving part are arranged opposite to each other with a detection area interposed therebetween, and the light receiving part detects changes in light from the light emitting part due to smoke, etc. Relating to a light beam detection device.

(Prior art) Conventionally, in an Iζ light type detection device, such as a separate type smoke detection device, a light emitting portion and a light receiving portion are arranged facing each other in a predetermined detection area. The light receiving section detects changes in the attenuation of light from the light emitting section due to smoke flowing into the detection area, and the receiver detects a fire when the received light signal falls below a predetermined threshold level. A detection signal is output.

By the way, in such a separate type smoke detection device,
When the light emitting part and the light receiving part are installed on a surface such as a ceiling, after the optical axis adjustment and optical axis adjustment of the light emitting part and the light receiving part are completed, adjust the light receiving signal level to the specified level without smoke entering the detection area. is being carried out.

However, in conventional devices, adjustment work is performed by putting the light-receiving section and the light-emitting section into operation by supplying power from the receiver. If it is shielded by mistake, a fire detection signal will be sent to the receiver 4r''i when the received light signal falls below the threshold level during adjustment.In this case, the same signal from the receiver Multiple other detection devices are connected to the line, and the fire signal is sent by short-circuiting the signal line from the receiver to a low impedance.
When a fire is detected by other detection device C that is not being adjusted,
Normal detection H due to fire detection signal output during adjustment
The fire detection signal from rFl cannot be received,
In addition, the fire detection signal that occurred during the adjustment was
In order to prevent erroneous operation of the monitor, the alarm must be reset at the receiver, and in any case, there was a problem in that a normal monitor OL could not be obtained during the adjustment.

(Object of the invention) The present invention has been made in view of the problems listed in -1-C.
The object of the present invention is to provide a light beam detection device having a function that allows inspection and adjustment to be made without interfering with the fire monitoring operations of other light beam detection devices connected to the same line.

(Structure of the Invention) In order to achieve this object, the present invention has a light emitting part that emits emitted light and a light receiving part that receives the emitted light from the light emitting part, which are spaced apart from each other by a predetermined detection area and faced to each other. In a light beam detection device that sends out a detection signal based on the light receiving output of the light receiving section, when adjusting the optical axis of the light emitting section and the light receiving section, the detection (n. It is designed to provide a means of prohibition.

(Example) Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 is an overall configuration diagram of an embodiment of the present invention. First, to explain the configuration, 1 is a receiver, and an N# dual-purpose fire signal line L1 and a common line L3 are drawn out from the receiver 1, and connect each of the plurality of light receiving sections 2 and the plurality of fire detectors 5. It supplies power to the light receiving section 2 and the fire detector 5 that form a light beam detection device which will be explained later, and
When the light beam detection device or fire detector 5 detects a fire,
A fire signal is sent by short-circuiting the power supply/fire signal line 1-1 and the common line 13. Further, an inspection signal line L2 is drawn out from the receiver 1 and connected to a plurality of light receiving sections 2. Here, the light receiving section 2 and the light emitting section 3 form a light beam detection device, and the light receiving section 2 and the light emitting section 3 are set to face each other with a predetermined interval, for example, a detection area 4 of 15111 mm. A pair of signal lines L4 and L5 are drawn out from the light receiving section 2 and connected to the light emitting section 3, and the signal lines L4 and L5 are connected to the light emitting section 3 to control the light emitting operation.
It is controlled from the light receiving section 2 via '5. The light emitting element 3ai emits light in response to a command from the light receiving section 2, and the emitted light is directed to the light receiving element 2a. The light receiving section 2 is provided with a prohibition means for prohibiting the sending of a fire signal during inspection and adjustment, and when the inspection and adjustment are completed, the prohibition means is released and the base W-value is set and registered based on the first light receiving section. Then, based on this reference value, a threshold value is calculated, and when the light emitted from the light emitting part 3 is received, the change in the light receiving part is compared with the threshold value L to make a fire judgment.

When the change in the amount of light received increases due to smoke entering the detection area, it is determined that there is a fire and a fire signal is sent out. The light receiving unit 2 also determines whether the registered reference value is normal or not, and if the reference value is abnormal, it sends out a check signal via the check signal line L2.

FIG. 2 is a block diagram showing the circuit configuration of the light receiving section 2 in FIG. 1. , 6 is a constant voltage power supply, which receives power supply from the receiver 1 and outputs a power supply voltage vh of, for example, 15V. Reference numeral 7 denotes a light emission control section, which controls the light emission operation of the light emission section 3 based on commands from the control section 8 . Reference numeral 9 denotes a constant voltage power supply, which receives the power supply vh from the constant voltage power supply 6, adjusts it to a voltage VIL lower than the power supply voltage vh, for example, 5V, and continuously supplies it to the control section 8 to control the control section. Reference numerals 1 and 10 are clock circuits that generate clock pulses of a predetermined pulse width at a predetermined cycle, and the control unit 8 receives the first clock pulse from the clock circuit 10. A series of control operations are then started based on the preset progera control. Reference numeral 11 denotes a constant voltage power supply, which receives the power supply from the constant voltage power supply 6 and adjusts it to a constant voltage Vm of, for example, IOV.
Power is supplied to the light receiving circuit 13 based on the control signal from
The light receiving circuit 13 has a built-in light receiving element 2a, an amplifier circuit and a hold circuit, and the light receiving element 2a is connected to the light emitting section 3.
The output of the received light is amplified by an amplifier circuit and held by a hold circuit. Based on the bolded detection signal (Y), the control signal from the control unit 8 is
/D conversion circuit 16.

Reference numeral 15 denotes a power supply voltage monitoring circuit, which inputs the output voltage from the reception control unit 12 and monitors a drop in the power supply voltage Vh, detects interruption of power supply from the receiver 1, and starts power supply after restoration. It monitors the upper part of the power supply voltage, and sends the monitoring information to the control section 8 via the Δ/1) conversion circuit 16. 17 is a reference voltage generation circuit, and reception control section 1
Receives power supply from 2 ()°C at a predetermined voltage Vr, for example 2
．． 5V, and apply the reference voltage V1 to the Δ/D conversion circuit 16.
give. Reference numeral 18 denotes a selection circuit that selects and sets the detection sensitivity of J'34 during adjustment and monitoring of the optical detection device, and connects the reference voltage vr from the reference voltage generation circuit 17 to the resistor R.
Resistors R1, R2, . . .
is the resistance R determined by the switching operation of the rotary switch 18a.
1, R2, . . . R11 and the resistor RO, and sends the divided voltage to the Δ/D conversion circuit 16 to designate the detection sensitivity during monitoring. In addition, a short circuit wire is connected to the adjustment position on the right side of the rotary switch 18a, and a resistor RO
Select and set the adjustment state by pulling the connecting line connected to the no-earth. The Δ/D conversion circuit 16
When the detection information from 3 and the selection information from the selection circuit 18 are input, the base voltage Vrf from the reference voltage generation circuit 17
! - It is converted into a digital code of multiple bits, for example, 4 bits 1, based on the reference, and the A/D converted information is sent to the control unit 8. The control unit 8 manually determines whether the selection information from the selection circuit 18 is in the adjustment state or the monitoring state, and when it determines that it is in the adjustment state, it prohibits the fire signal output unit 21 from sending out a fire signal and overrides it. , outputs a monitor signal to the monitor signal output section 19. In addition, in the adjustment state, every time the light receiving output from the light receiving circuit 13 is increased by 1q, it is updated and recorded as a reference value, and when the monitoring state is determined by switching the selection circuit 18, the update is recorded. Hiiragi no MoiA
(Determines whether the value is within a predetermined value range, and if it is outside the predetermined value range, the inspection signal output unit 20tCrH
Commands the sending of the detection signal. Also, during monitoring, the wJ value is calculated by multiplying the detection sensitivity selected and set by the selection circuit 18 and the registered reference value, and the fire judgment is made by comparing the threshold value and the magnitude of the detected light reception φ. When a fire is determined, the fire signal output section 21 is activated and commanded to send out a fire signal.

FIG. 3 is a program flow diagram showing the control operation of the first control section 8 shown in FIG.

To explain the operation with reference to the program flow diagram in Figure 3, first, when installing the light beam detection device, adjust the optical axis of the light receiving section 2 and the light emitting section 3, and adjust the light receiving level, etc. In block a, the selection information from the selection circuit 18 is panned to determine whether it is in the monitoring state or the adjustment state.
If it is determined in block b that it is in the adjusted state, the process proceeds to block C, where the fire judgment is stopped and the fire signal sending section 21 is prohibited from sending out a fire signal. In block d, light receiving circuit 1
Every time the received light output from 3 is obtained, it is updated as a reference value ♀11
At the same time as 9 and t+, the monitor signal output section 19 is activated in block e and a C monitor signal is output. Therefore, the adjustment worker can check the monitor 4 without worrying about sending out a fire signal due to the adjustment.
It is possible to adjust the optical axis of the light-receiving section 2 and the level of the light-receiving signal (iffi signal).When the adjustment work is completed, the rotary switch 188 built in the selection circuit 1ε3 is operated to set the desired detection sensitivity, e.g. When the detection sensitivity is switched to 50%, the selection information from the selection circuit 18 is deciphered, and it is determined that there is a monitoring state C with a detection sensitivity of 50%. 15 monitors the power supply voltage, and when it is determined that the power supply voltage is normal based on the astigmatism information from the power supply voltage monitoring circuit 15, the process proceeds from block f to block L1 to block 9. In block 9, t Yo,
The threshold value is calculated by multiplying the set detection sensitivity value of 50% by the reference bean paste value registered in J3 in 10tsukud.

In block 11, a fire judgment is made by comparing the detected threshold value and the detection signal from the light receiving circuit 13, and if the amount of dimming is small, and if the detection signal is larger than the threshold value, it is judged as normal. The system returns to block a again and continues the monitoring operation. When the amount of light attenuation increases due to the intrusion of smoke, etc. into the detection area, and the detection signal becomes smaller than 4 (0), it is determined that there is a fire, and the process proceeds to block 1, where the fire* (# output section 21 is activated.) command to send out.

FIG. 4 is a circuit diagram showing another embodiment of the present invention. In this embodiment, when the rotary switch 18a built in the selection circuit 18 shown in FIG. The feature is that the detection operation of the CR is stopped and the transmission of fire signals is prohibited, and when monitoring a fire, the rotary switch 18a is set to an arbitrary detection sensitivity.
When the control unit 8 starts the detection operation of cR and determines that there is a fire, it sends a command signal of a predetermined voltage through the resistor Rs (79 to the charging circuit consisting of the capacitor C and the resistor R9, and outputs the command signal to the thyristor SC).
When you turn on R and turn on the alarm indicator LED,
Resistance 1. J: Unishitachino sends the line current determined by tf back to the receiver 1 to send out a fire signal.

In the above embodiment, the light emitting part that emits the emitted light and the light receiving part that receives the emitted light from the light emitting part are placed opposite to each other with a predetermined detection area in between, and the light reception output due to the smoke that has entered the detection area is avoided. We have described a light beam detection device that sends out a fire signal based on a change in The present invention can also be applied to burglar alarms, photoelectric switches, etc. that output detection signals based on changes in .

(Effects of the Invention) As described above, according to the present invention, the light emitting section that emits the emitted light and the light receiving section that receives the emitted light from the light emitting section are made to face each other with a predetermined detection area separated from each other, and the light emitting section emits light. In a light beam detection device that sends out a detection signal based on the light receiving output of the light receiving section to detect changes in the detection area of the light receiving section, a prohibition means is provided to prohibit sending out the detection signal when adjusting the optical axis of the light emitting section and the light receiving section. Inspection of the optical detection device by making it work, 1.
Even if a fire detection state occurs due to the optical axis adjustment of the light receiving part and the light emitting part, the fire signal is prohibited from being sent to the receiver, and other fire detectors connected to the same line are prohibited from transmitting the fire signal. The effect of zero reduction can be achieved by performing inspections and iJ8 adjustments without interfering with fire monitoring operations.

[Brief explanation of drawings]

Fig. 1 is an overall block diagram of an embodiment of the present invention, Fig. 2 is a block diagram showing the circuit structure of the light receiving section in Fig. 1, and Fig. 3 is a block diagram of the J hub shown in Fig. 2. FIG. 4 is a program flow diagram showing the control operation of the ti control section, and FIG. 4 is a circuit diagram showing another embodiment of the present invention. 1: Receiving section 2a: Light receiving element 3: Light emitting section 3a: Light emitting element 4: Detection area 5: Fire detector 6.9.11: Constant voltage power supply Patent applicant Hojiki Co., Ltd. agent Patent Attorney 1'1 Susumu Uchi

Claims (1)

[Claims] A light beam type in which a light emitting part and a light receiving part are placed opposite to each other with a predetermined detection area in between, and the light receiving part detects a change in the light emitted from the light emitting part in the detection area and outputs a detection signal. A light beam type detection device, characterized in that the detection device is provided with a prohibiting means for prohibiting the light receiving section from outputting a detection signal when adjusting the optical axis of the light emitting section and the light receiving section.