JPH09115077A - Photoelectric sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically readjust optical axis misalignment and perform the readjustment of a photodetection level by detecting a shock to a sensor, and quitting normal fire monitoring on the basis of the detection output and performing a self-diagnosis. SOLUTION: When the sensor is given acceleration or vibration owing to a shock, etc., an acceleration sensor 63 detects that and acceleration sensor interruption processing is started. And, next acceleration sensor interruption is inhibited until processing of one cycle is completed, and sensitivity is tested as the preprocessing of optical axis adjustment and photodetection level adjustment. At this time, an interruption signal is supplied from an interruption signal generator 64 to a fire judging circuit 59 and a switch 65 is closed. The fire judging circuit 59 once receiving the interruption signal starts testing the sensitivity. After the sensitivity test, it is judged whether or not the sensitivity is normal, and when not, it is considered that the sensor is given the acceleration or vibration owing to the shock and an optical axis, a photodetection level, etc., have gone wrong, and adjusting of the optical axis and photodetection level is carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photoelectric sensor, and in particular, for example, a light-transmitting portion and a light-receiving portion are separately arranged, and a light-receiving portion for detecting a change in smoke or the like due to light projected from the light-transmitting portion, for example, infrared rays. The present invention relates to a photoelectric separation type sensor for detecting by.

[0002]

2. Description of the Related Art Generally, a photoelectric separation type sensor separates a light-transmitting part that emits light from a light-receiving part that receives the light and installs them so as to face each other with a space in between to detect the amount of smoke received in the space. The presence of smoke is detected due to the decrease in the light emission, but when installing it, it is necessary to adjust the optical axis so that the light-transmitting part and the light-receiving part correctly face each other and to adjust the light-receiving level to properly adjust the amount of light received. . Recently, sensors that automatically adjust all or some of these adjustments are also being proposed. However, these adjustments
Even if it is properly adjusted at the beginning, if it shifts or goes wrong later, normal fire monitoring will not be possible and it will cause a false alarm or non-fire alarm. Factors that may cause the optical axis adjustment and the light receiving level adjustment of the sensor to be inconsistent are, for example, the impact of a flying ball or the like, the influence of a building vibration due to an earthquake or the like, or the effect of artificial mischief.

[0003]

However, in the conventional photoelectric sensor, even when the optical axis adjustment or the light receiving level adjustment is impacted as described above, it is detected and the optical axis is adjusted erroneously. Since there is no means for correcting the received light level adjustment, there is a problem that a non-fire alarm is issued even if it is not a fire, or a false alarm occurs.

The present invention has been made in order to solve such a problem, and detects a vibration applied to a sensor when a shock or the like is applied to detect an erroneous optical axis adjustment or a received light level adjustment. It is an object of the present invention to provide a photoelectric sensor that can be adjusted and, if it cannot be readjusted, at least not a fire but informs that the sensor is abnormal.

[0005]

A photoelectric sensor according to the present invention is provided with a light transmitting section for emitting light at a predetermined interval, and a light transmitting section provided so as to face the light transmitting section with a smoke detection space interposed therebetween. A light-receiving part for receiving light from a light-receiving part, and detecting the presence or absence of smoke in the smoke-detecting space by changing the amount of light received by the light-receiving part. A detection means for detecting an impact is provided, and normal fire monitoring is stopped based on the output of the detection means to perform self-diagnosis.

Further, it has a light-transmitting section for emitting light at a predetermined interval, and a light-receiving section provided to face the light-transmitting section with a smoke detection space interposed therebetween and for receiving light from the light-transmitting section. A photoelectric sensor that detects the presence or absence of smoke in the smoke detection space when the amount of light received by the light receiver changes, and is provided in or near the sensor, and is a detection means for detecting an impact on the sensor and the output of the detection means. And adjusting means for performing at least one of optical axis adjustment and light receiving level adjustment based on the above. Further, it has a sensitivity adjusting function.

Further, it has a light-transmitting section for emitting light at a predetermined interval, and a light-receiving section provided to face the light-transmitting section with a smoke detection space interposed therebetween and for receiving light from the light-transmitting section. A photoelectric sensor that detects the presence or absence of smoke in the smoke detection space when the amount of light received by the light receiver changes, and is provided in or near the sensor, and is a detection means for detecting an impact on the sensor and the output of the detection means. And a sensitivity test means for performing a sensitivity test based on the above, and at least one of the optical axis adjustment and the received light level adjustment is manually performed based on the output of the sensitivity test means.

Further, it has a light-transmitting section for emitting light at a predetermined interval, and a light-receiving section which is provided so as to face the light-transmitting section with a smoke detection space interposed therebetween and which receives light from the light-transmitting section. A photoelectric sensor that detects the presence or absence of smoke in the smoke detection space when the amount of light received by the light receiver changes, and is provided in or near the sensor, and is a detection means for detecting an impact on the sensor and the output of the detection means. And a light-reception level measuring means for measuring the light-reception level on the basis of the light receiving level, and at least one of the optical axis adjustment and the light-reception level adjustment is manually performed based on the output of the light-reception level measuring means. Further, it has means for generating an abnormal signal when the sensor is abnormal in relation to the output of the detecting means.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. 1 is a top view showing a first embodiment of the present invention, and FIG. 2 is a side view showing a part of line AA in FIG. In the figure, 1 is a housing made of, for example, metal or resin, 2 is a rotary plate provided in the housing 1, 3 is an optical system support base attached to the rotary plate 2, and 4 is an optical system support base 3. The mounted optical system, 5 is an elongated hole for adjusting the optical system position angle formed in the rotary plate 2, 6 is a lens of the optical system, 7 is a printed board provided in the housing 1, and 8 is a printed board 7 The connector 9 is attached to the photodiode 9, and the photodiode 9 is provided behind the optical system 4. Reference numeral 10 is a horizontal motor for automatic optical axis adjustment mounted on the rotary plate 2, and 11 is a vertical motor for automatic optical axis adjustment, also mounted on the optical system support 3.

Reference numeral 12 denotes a male screw whose one end is connected to the rotary shaft of the horizontal motor 10 and the other end (screw head 12a) is fixed to the bent portion 2a of the rotary plate 2, and 13 denotes the bent portion 3a of the optical system support 3. The female screw 14 is formed on the male screw 12 and is movable together with the optical system support base 3 by screwing the male screw 12, and the male screw 12 is interposed between the bent portion 3a of the optical system support base 3 and the screw head 12a. It is a spring.
One end of 15 is connected to the rotary shaft of the vertical motor 11,
The other end (screw head 15a) is a movable male screw fixed to a part of the optical system 4, and the optical system 4 moves when the screw head 15a moves. Reference numeral 16 denotes a female screw which is formed in the bent portion of the optical system 4 and is screwed into the male screw 15, and 17 denotes a spring which is inserted in the male screw 15 between the bent portion of the optical system 4 and the screw head 15a. . Reference numeral 18 denotes an acceleration sensor that is attached to the printed board 7 and is electrically connected to a circuit inside the printed board 7. The acceleration sensor 18 detects the vibration of the sensor when an external shock or the like is applied to the sensor. The mounting position of the acceleration sensor 18 is
The present invention is not limited to this, and may be inside the sensor, near the surface, or outside the sensor.

The entire structure of FIGS. 1 and 2 is substantially the same in the light transmitting section and the light receiving section in the photoelectric separation type sensor, and the difference between them is that the light emitting element and the light receiving element (not shown). The difference is that the area of the printed circuit board 7 is increased by the amount of signal processing in the case of the light receiving portion with respect to the light transmitting portion. 1 and 2 typically show the case of a light receiving unit.

FIG. 3 is a perspective view showing an example of the acceleration sensor 18. This acceleration sensor includes a support base 20 made of a non-conductor having an arbitrary shape for supporting each part, a weight 21 provided with inertia to detect acceleration, and a support base 20 integrated with the weight 21. An electrode 22 made of a conductor fixed to the support base 20 so as to be self-supporting so that it is movable, and an electrode made of a conductor fixed to the support base 20 so as to surround the electrode 22. 23 and. Now, when there is no normal acceleration or vibration, the electrode 22 becomes self-supporting due to the restoring force of the fixed portion of the support base 20, so the electrical resistance between the electrode 22 and the electrode 23 is substantially the resistance of the support base 20 made of a non-conductor. It becomes a value.

On the other hand, when the sensor is subjected to acceleration or vibration due to a shock or the like, the weight 21 has inertia so that the motion is slower than other parts, and the acceleration is relatively relative to other parts of the sensor. When receiving the acceleration, it will move in the direction opposite to the direction in which the acceleration was received. Then, the electrode 22 integrated with the weight 21
Since the electrode 23 is in contact with the electrode 23, the electric resistance between the electrode 22 and the electrode 23 is significantly lower than the resistance value of the support 20 itself. Therefore, if a conductive wire is attached to the electrodes 22 and 23 and a voltage is applied, the presence or absence of acceleration can be detected by detecting the current change between them. In addition, the electrodes 22 and 23
By adjusting the size of the gap between them and the elastic force of the self-supporting force of the electrode 22, it is possible to adjust the magnitude of acceleration or vibration to be detected.

FIG. 4 is a constitutional view showing another example of the acceleration sensor 18, FIG. 4 (a) is a plan view thereof, and FIG. 4 (b) is a sectional view taken along the line A--A 'in FIG. 4 (a). FIG. The acceleration sensor 18, a support base 30 made of a non-conductor having a recess, and electrodes 31 and 32 made of a conductor provided with a predetermined gap so as not to come into contact with the top and bottom of the recess of the support base 30, respectively. When the liquid surface is not subjected to acceleration or vibration, the conductive liquid 33 such as mercury is injected into the concave portion of the support base 30 in an amount that does not reach the electrode 31. The electrode 32 and the conductive liquid 33 are always in contact with each other, and the conductive liquid 33 has a predetermined potential.

When there is no acceleration or vibration, the liquid surface of the conductive liquid 33 does not touch the electrode 31.
The electrical resistance between the electrode 32 and the electrode 32 has a high resistance value of the support base 30 substantially made of a non-conductor. On the other hand, when the sensor is subjected to acceleration or vibration due to a shock or the like, the conductive liquid 33
Since the liquid surface of the electrode is wavy and the liquid surface touches the electrode 31, the electrode 3
1 and the electrode 32 are electrically connected, and the electric resistance thereof is substantially the low resistance value of the conductive liquid 33. Therefore, the presence or absence of acceleration or vibration can be detected by monitoring the current flowing through the voltage applied between the electrodes 31 and 32. In addition, in the example of FIG. 4, the case where the conductive liquid 33 is put into the concave portion of the support base 30 has been described.
The space for storing 3 may be a closed space.

FIG. 5 is a circuit diagram showing an example of an electric circuit according to an embodiment of the present invention. In the figure, reference numeral 40 is a light transmitting section that emits light, 41 is a light source for a light emitting element, and 42 is a light emitting diode as a light emitting element.
2 is connected to both ends of the power supply 41 via a light emission control switch 43 and a current limiting resistor 44. Reference numeral 45 denotes a condenser lens provided on the front surface of the light emitting diode 42.

Reference numeral 50 designates a light receiving section which is installed so as to face the light transmitting section 40 with the smoke detecting space interposed therebetween and which receives light from the light transmitting section 40.
Reference numeral 51 is a photodiode as a light receiving element corresponding to the above-mentioned photodiode 9, and 52 is a photodiode 51.
A condenser lens 53, which is a part of the above-mentioned optical system lens 6 provided on the front surface of the, is connected to both ends of the photodiode 51, and the processing voltage of various circuits in the subsequent stage becomes appropriate values (appropriate level). Is an input adjustment resistor for adjusting the input level. In the present embodiment, the input adjustment resistor 53 is adapted to be manually adjusted or automatically adjusted. In the case of automatic adjustment, for example, a motor-driven variable resistor or a plurality of resistors connected in series is used. A digitally controlled potentiometer or the like including switching elements such as transistors connected in parallel to the plurality of resistors is used, and is adjusted by a control signal from a fire determination circuit described later. Reference numeral 54 denotes an operational amplifier. The inverting input terminal of the operational amplifier 54 is connected to the anode of the photodiode 51 via the resistor 55, and the non-inverting input terminal is directly connected to the cathode of the photodiode 51. A resistor 56 is connected between the inverting input terminal and the output terminal of the operational amplifier 54.

Reference numeral 57 is a sample hold circuit for sampling and holding the output of the operational amplifier 54, 58 is an A / D conversion circuit for converting the output of the sample hold circuit 57 from an analog signal to a digital signal, and 59 is an A / D conversion circuit. A fire determination circuit, such as a microcomputer, for determining the presence or absence of a fire based on the output of 58, stores the amount of light received after power-on as a reference value for fire determination, and at the same time sets an appropriate level for adjusting the light receiving level. This is a memory circuit that is stored in advance. The fire determination circuit 59 uses this storage circuit 60.
The fire is judged by comparing the reference value stored in (4) with the output value from the A / D conversion circuit 58. Also, the fire judgment circuit 5
Although not shown, the reference numeral 9 supplies a drive signal to the horizontal direction motor 10 and the vertical direction motor 11 on the light transmitting unit 40 side and the light receiving unit 50 side, respectively, when adjusting the optical axis.
For transmission of this drive signal, it is conceivable to superimpose it on a power supply line (not shown), or to use a dedicated signal line, especially for the light transmitting unit 40.

Reference numeral 61 is an information transmission circuit for transmitting a fire signal or the like from the fire determination circuit 59 to an external receiver or the like, or for transmitting information from the receiver or the like to an internal circuit such as a power supply circuit 62. 63 is an acceleration sensor corresponding to the above-described acceleration sensor 18 provided inside or on the surface of or in the vicinity of the sensor, 64 is an interrupt signal generator that generates an interrupt signal in response to the output of the acceleration sensor 63, and 65 is a resistor. Is connected to both ends of the resistor 56 via a resistor 66, and an interrupt signal generator 64
It is a switch whose opening and closing is controlled by an interrupt signal from, for example, a transistor or a relay contact. In FIG. 5, the light-transmitting unit 40 is provided with a light-emitting element power source, but in reality, the light-emitting unit 50 is powered by the power source circuit 62 to the power source circuit 62.

Next, the operation will be described with reference to FIG. Now, when the power is turned on (step S1), the acceleration sensor interrupt process is prohibited (step S2),
In step S3, first, the optical axis is adjusted. In this optical axis adjustment, the horizontal direction motor 10 and the vertical direction motor 11 on the side of the light transmitting unit 40 and the side of the light receiving unit 50 are moved to move the optical system support 3 on the side of the light receiving unit 50 in a range in which the optical system support base 3 can be rotated in the horizontal direction and the vertical direction. At the center, the light transmitting unit 40 side is directed to one of the rotatable ranges in both the horizontal and vertical directions. Then, the input adjustment resistor 53 is adjusted based on the control signal from the fire determination circuit 59 to gradually increase the gain of the operational amplifier 54 on the light receiving unit 50 side, and the light from the light transmitting unit 40 is halved to an appropriate level. Adjust to a gain that can receive up to. If the light cannot be received, adjust to the maximum gain.

Next, the horizontal motor 10 on the side of the light transmitting section 40.
Gradually move from the side you turned to the opposite. if,
Immediately, if the light-receiving level drops compared to before moving, turn the direction to the fully rotated side and stop the rotation. When the received light level does not change or rises, it is further gradually turned to the same direction, the change in the received light level is observed by a display (not shown), and turned until it decreases. If the light receiving level exceeds the appropriate level during the rotation, the gain of the operational amplifier 54 is reduced. Horizontal motor 1
When the light receiving level starts to decrease by continuing to turn 0, the rotation direction of the horizontal motor 10 is reversed and the rotation is stopped at the point where the light receiving level is the highest. If the point where it continues to rotate in the same direction and begins to decrease is not found, and reaches the full rotatable range on the opposite side, stop there.

Next, in the vertical direction as well, the vertical motor 11 is similarly rotated to observe the change in the light receiving level, and the rotation of the vertical motor 11 is stopped at the point where the light receiving level becomes the highest. When the orientation of the light-transmitting unit 40 is determined, the horizontal motor 10 and the vertical motor 11 are similarly rotated even if the light-receiving unit 50 is attached to the light-receiving unit 50 side, and the motor is stopped at the point where the light-receiving level becomes highest.

In this way, when the optical axis adjustment in step S3 is completed, it is judged whether or not the optical axes are correctly aligned (step S4). If they are aligned, then step S3 is performed.
In 5, the light receiving level is adjusted. In this light reception level adjustment, the output (gain) of the operational amplifier 54 is taken into the fire judgment circuit 59 through the sample hold circuit 57 and the A / D conversion circuit 58, and this taken-in gain is compared with the proper level read from the memory circuit 60. , If the gain is lower than the proper level, observing the received light level,
The input adjusting resistor 53 is automatically adjusted based on a control signal from the fire judging circuit 59, for example, by rotating a motor (not shown) of the resistor 53 to increase the gain of the operational amplifier 54 to an appropriate level. . Then, when the gain of the operational amplifier 54, that is, the amount of received light reaches an appropriate level, the adjustment of the received light level ends.

In this way, when the adjustment of the light receiving level in step S5 is completed, it is judged whether or not the light receiving level is within the proper level range (step S6). If it is within the proper level range, acceleration is performed. The prohibition of sensor interrupt processing is released (step S7), and in step S8,
Enter the normal fire monitoring state. In this fire monitoring state, on the side of the light transmitting unit 40, an electric current intermittently flows from the power source 41 to the light emitting diode 42 through the resistor 44 and the switch 43 to intermittently emit light (every 3 seconds, for example). The light energy of is formed into a beam shape by the condenser lens 45 and is applied to the smoke detection space. On the side of the light receiving unit 50, the light is emitted from the side of the light transmitting unit 40, and the smoke detection space (monitoring distance 5
The beam-shaped light that has passed through 100 m) is condensed on the photodiode 51 by the condenser lens 52. The output current of the photodiode 51 flows through the input adjustment resistor 53 and returns, so that a voltage proportional to the current is generated across the input adjustment resistor 53. Therefore, in the above-mentioned light reception level adjustment and the like, by changing the resistance value of the input adjustment resistor 53, an appropriate voltage value convenient for the processing in each circuit in the subsequent stage can be obtained.

The voltage generated across the input adjustment resistor 53 is supplied to the operational amplifier 54 and amplified. In this normal fire monitoring state, the switch 65 is kept open. The output of the operational amplifier 54 is the sample hold circuit 57.
Is supplied to the fire judging circuit 5 and the analog voltage held there for a certain period of time is A / D converted by the A / D converting circuit 58.
9. The fire determination circuit 59 first stores the amount of light received after the power is turned on as a reference value in the storage circuit 60, and thereafter, every time data is sent from the A / D conversion circuit 58, the reference value is read from the storage circuit 60. If the extinction rate is calculated and the extinction rate is larger than a specified value (for example, 10% / m), a fire signal is sent to the information transmission circuit 61 in the subsequent stage.

The information transmission circuit 61 normally receives a voltage sent from a receiver or other base station with high impedance and sends it to the power supply circuit 62.
When a fire signal is sent from 9, the voltage from the receiver is received with a low impedance, and a current is passed to inform the receiver that there is a fire. Further, in this case, a method of directly transmitting information such as the extinction ratio as a digital signal to the receiver may be adopted.

On the other hand, if the optical axes are not aligned in step S4, for example, if one or both of the horizontal direction motor 10 and the vertical direction motor 11 are fully rotated to one of the rotatable ranges, the optical axis adjustment is not performed. Possible (step S
As 4), "abnormal" is displayed on the display and an abnormal signal is sent to the receiver (step S9). Similarly, step S
Even when the light receiving level is not within the range of the appropriate level at 6, the light receiving level cannot be adjusted, "abnormal" is displayed on the display, and an abnormal signal is sent to the receiver (step S9). Then, the fire monitoring function is stopped (step S10).

In such a fire monitoring state, when the sensor receives acceleration or vibration due to a shock or the like, the acceleration sensor 63 detects the acceleration or vibration, and the acceleration sensor interrupt process starts (step S11). Then, the next acceleration sensor interruption is prohibited until one cycle of processing is completed (step S12), and a sensitivity test is first carried out as a preprocessing of the optical axis adjustment and the light reception level adjustment (step S13). At this time, the interrupt signal generator 64 supplies an interrupt signal to the fire judging circuit 59 and also supplies it to the switch 65 to close it. When the fire determination circuit 59 receives the interrupt signal, it does not recognize it as a fire even if the input signal drops until the interrupt signal stops, and recognizes the signal as being in the sensitivity test and starts the sensitivity test. .

In the sensitivity test, when the switch 65 is closed, the resistor 56 of the operational amplifier 54 is connected in parallel with the resistor 66, and the resistance value between the inverting input terminal and the output terminal of the operational amplifier 54 becomes both. It decreases to the combined resistance value of the resistor. That is, assuming that the resistance values of the resistors 56 and 66 are Rf1 and Rf2, respectively, and the combined resistance value is Rf, the combined resistance value Rf
Is represented by Rf = (Rf1.Rf2) / (Rf1 + Rf2), and the resistance value between the inverting input terminal and the output terminal of the operational amplifier 54 decreases to this combined resistance value Rf. As a result, the gain of the operational amplifier 54 is reduced by that amount, and its output value is reduced to Rf / Rf1.

Equivalently, the transmittance is Rf in the smoke detection space.
/ Rf1 {at the extinction rate, (Rf-Rf1) / Rf} smoke will be present, and the circuit at the subsequent stage will become (Rf-Rf) at the extinction rate.
1) It will be possible to test the operation of the sensor based on whether or not the smoke equivalent to / Rf} actually behaves. Also, in the case of the method of notifying the receiver of the extinction rate with a digital signal, by confirming whether or not the correct concentration is sent, the fire judgment circuit having the function of calculating the extinction ratio of the sensor and the fire judgment function. It is possible to confirm whether 59 or the information transmission circuit 61 is operating correctly. Furthermore, by appropriately changing the resistance value of the resistor 66, it is possible to perform a sensitivity test at several extinction rates.

In this way, when the sensitivity test in step S13 is completed, it is judged whether or not the sensitivity is normal (step S14). If the sensitivity is not normal, the sensor causes acceleration or vibration due to the above-mentioned shock or the like. It is considered that the receiving, the optical axis, the light receiving level, and the like are out of order, and the optical axis adjustment and the light receiving level adjustment are performed by the same method as described above (steps S15 and S16). Then, it is again determined whether the sensitivity is normal (step S1
7) If it is not normal, the optical axis cannot be adjusted and the light receiving level cannot be adjusted, "abnormal" is displayed on the display and an abnormal signal is sent to the receiver (step S9), and then the fire monitoring function is stopped. (Step S10). On the other hand, if the sensitivity is normal in both steps S14 and S17, the prohibition of the acceleration sensor interrupt process is released (step S1).
8) Return to the normal fire monitoring state (step S1)
9). In this way, in this embodiment, it is possible to automatically adjust the optical axis of the sensor or the light-receiving level that is incorrect due to a shock or the like, based on the output of the acceleration sensor.

Embodiment 2 FIG. FIG. 7 is a circuit diagram showing a second embodiment of the present invention. In the figure, parts corresponding to those in FIG. 5 are designated by the same reference numerals, and detailed description thereof will be omitted. In the first embodiment, in order to perform the sensitivity test, the gain of the operational amplifier 54 of the light receiving unit 50 is controlled, but in the present embodiment, the light emission intensity of the light transmitting unit 40A is controlled. . Therefore, in the present embodiment, the light receiving unit 50A is configured by omitting the switch 65 and the resistor 66 which are connected in parallel to the resistor 56 in the operational amplifier 54, while the switch 4
A resistor 67 is inserted between the resistor 3 and the resistor 44, and a switch 65 is connected in parallel to the resistor 67 to form the light transmitting section 40A. The switch 65 is normally kept closed. Other configurations are the same as those in FIG.

Next, the operation will be described with reference to FIG. The optical axis adjustment, the received light level adjustment, and the operation in the normal fire monitoring state in this operation are substantially the same as those in the case of FIG. When the sensor receives acceleration or vibration due to a shock or the like in the fire monitoring state as described above, the acceleration sensor 63 detects the acceleration or vibration, and the acceleration sensor interrupt process is started (step S1).
1). Then, the next acceleration sensor interruption is prohibited until one cycle of processing is completed (step S12), and a sensitivity test is first carried out as a preprocessing of the optical axis adjustment and the light reception level adjustment (step S13). At this time, an interrupt signal is supplied from the interrupt signal generator 64 to the fire determination circuit 59 and also to the switch 65 on the side of the light transmitting unit 40A to open it. When the fire determination circuit 59 receives the interrupt signal, it does not recognize it as a fire even if the input signal drops until the interrupt signal stops, and recognizes the signal as being in the sensitivity test and starts the sensitivity test. .

In the sensitivity test, when the switch 65 is opened, the resistor 67 is inserted between the resistor 44 and the light emitting diode 42, and the combined resistance value increases. That is,
The resistance values of the resistors 44 and 67 are Rd1, Rd2,
If the combined resistance value is Rd, the combined resistance value Rd is Rd = Rd1
It is represented by + Rd2, but the power source 4 is up to this combined resistance value Rd.
1 and the resistance value between the light emitting diode 42 increase. As a result, the light emission intensity of the light emitting diode 42 is reduced by that amount, and the light receiving portion 5 is substantially even if there is no smoke in the smoke detection space.
The amount of light received at 0 A is reduced to Rd1 / Rd.

Equivalently, the transmittance is Rd1 in the smoke detection space.
/ Rd {at the extinction rate, there will be (Rd-Rd1) / Rd} smoke, and the circuit at the subsequent stage that receives this output will produce (Rd-Rd1) / Rd} smoke at the extinction rate. It will be possible to test the operation of the sensor by whether it behaves as if it actually exists. Also, in the case of the method of notifying the receiver of the extinction rate with a digital signal, by confirming whether or not the correct concentration is sent, the fire judgment circuit having the function of calculating the extinction ratio of the sensor and the fire judgment function. It is possible to confirm whether 59 or the information transmission circuit 61 is operating correctly. Further, by appropriately changing the resistance value of the resistor 67, it is possible to perform a sensitivity test at several dimming rates.

In this way, when the sensitivity test in step S13 is completed, it is judged whether or not the sensitivity is normal (step S14), and if not normal, the sensor causes acceleration or vibration due to the above-mentioned shock or the like. It is considered that the receiving, the optical axis, the light receiving level, and the like are out of order, and the optical axis adjustment and the light receiving level adjustment are performed by the same method as described above (steps S15 and S16). Then, it is again determined whether the sensitivity is normal (step S1
7) If it is not normal, it is judged that the optical axis cannot be adjusted and the light receiving level cannot be adjusted, "abnormal" is displayed on the display and an abnormal signal is sent to the receiver (step S9), and then the fire monitoring function is stopped. (Step S10). On the other hand, if the sensitivity is normal in both steps S14 and S17, the prohibition of the acceleration sensor interrupt process is released (step S1).
8) Return to the normal fire monitoring state (step S1)
9). In this way, also in this embodiment, the optical axis adjustment and the light-receiving level adjustment of the sensor that has gone wrong due to a shock or the like can be automatically performed based on the output of the acceleration sensor.

Embodiment 3 FIG. 8 is a flow chart showing the third embodiment of the present invention. In the first and second embodiments, the sensitivity adjustment function is provided, and the optical axis adjustment and the light receiving level adjustment are automatic. However, in the present embodiment, the optical axis adjustment and the light receiving level adjustment are performed manually, and the sensitivity adjustment is performed. This is the case of having only the function. Therefore, the circuit configuration is substantially the same as that of FIG. 5 or FIG. 7 except that the horizontal motor 10 and the vertical motor 11 are omitted, and the input adjustment resistor 53 is manually operated. The illustration is omitted.

Next, the operation will be described with reference to FIG. In FIG. 8, steps corresponding to those in FIG. 6 will be described with the same reference numerals. Now, when the power is turned on (step S1), the acceleration sensor interrupt process is prohibited (step S2), and whether the operation mode is the adjustment mode or the monitoring mode is determined by the state of a mode change switch (not shown) provided in the sensor. Judgment (step S21), if it is in the adjustment mode, the input adjustment resistor 53 is manually adjusted to adjust the light receiving level, and the optical axis adjustment is performed manually by using the optical system support base 30 instead of the above-mentioned motor. It is moved and is performed in the same manner as described above (step S22). When the manual adjustment of the optical axis and the manual adjustment of the light receiving level are completed, the power is once turned off, and then the process returns to step S1 to turn on the power (step S23).

If the monitor mode is selected in step S21, a sensitivity test is performed in the same manner as described above (step S24), and in step S25, it is determined whether or not the sensitivity is normal.
If the sensitivity is normal, the prohibition of the acceleration sensor interrupt process is released (step S7), and the normal fire monitoring state as described above is entered in step S8. On the other hand, if the sensitivity is not normal in step S25, the sensitivity cannot be adjusted, "abnormal" is displayed on the display, and an abnormal signal is sent to the receiver (step S9). Then, the fire monitoring function is stopped (step S10).

In such a fire monitoring state, when the sensor receives acceleration or vibration due to a shock or the like, the acceleration sensor 63 detects this and the acceleration sensor interrupt process is started (step S11). Then, the next acceleration sensor interrupt is prohibited until one cycle of processing is completed (step S12), and the sensitivity test is performed in the same manner as described above (step S13). Then, in step S17, it is judged whether or not the sensitivity is normal, and if not normal, it is considered that the sensor receives acceleration or vibration due to the factors such as the above-mentioned impact and the optical axis, the light receiving level and the like are deviated. Then, the sensitivity cannot be adjusted, "abnormal" is displayed on the display, and an abnormal signal is sent to the receiver (step S9). Thereafter, the fire monitoring function is stopped (step S10).

Then, returning to step S1, the input axis adjustment resistor 53 is manually adjusted to adjust the optical axis and the light receiving level while the acceleration sensor interruption is prohibited (step S22). On the other hand, if the sensitivity is normal in step S17, the prohibition of the acceleration sensor interrupt process is released (step S18), and the normal fire monitoring state is restored (step S19). In this way, in this embodiment, even in the case of the sensor only with the sensitivity adjustment function, the optical axis adjustment or the light reception level adjustment of the sensor which is deviated due to a shock or the like is manually performed based on the output of the acceleration sensor. Can be done at.

Embodiment 4 9 is a circuit diagram showing a fourth embodiment of the present invention. In the figures, FIG. 5 and FIG.
The same reference numerals are given to the portions corresponding to and the detailed description will be omitted. In the first and second embodiments, the sensitivity adjustment function is provided, and when the optical axis adjustment and the light reception level adjustment are automatic, in the third embodiment, the optical axis adjustment and the light reception level adjustment are manually performed, and only the sensitivity adjustment function is provided. However, in the present embodiment, the optical axis adjustment and the light receiving level adjustment are manually performed.
It may not have a sensitivity adjustment function.

Therefore, the circuit configuration is the horizontal motor 1
0, the vertical direction motor 11, the switch 65, the resistors 66 and 67 are omitted, and the input adjusting resistor 53 is manually operated, which is substantially the same as the case of FIG. 5 or FIG. In the embodiment, the switch 71 provided between the A / D conversion circuit 58 and the fire determination circuit 59 for switching between the adjustment mode and the monitoring mode, the input side is the interrupt signal generator 64, and the fixed terminal of the switch 71 (the fire determination circuit). Circuit 59
Side) and the output side is connected to the information transmission circuit 61 to determine the light receiving level and the light receiving level determining circuit 72 is connected to the light receiving level determining circuit 72 and the appropriate level storage circuit 73 stores the appropriate level in advance. And a light-reception level display circuit 74 that is connected to the movable terminal of the switch 71 (on the A / D conversion circuit 58 side) and displays the light-reception level.

Next, the operation will be described with reference to FIG. In FIG. 10, steps corresponding to those in FIG. 8 will be described with the same reference numerals. Now, when the power is turned on (step S1), the acceleration sensor interrupt process is prohibited (step S2), and whether the operation mode is the adjustment mode or the monitoring mode is determined by the state of a mode change switch (not shown) provided in the sensor. If it is determined (step S21) and the adjustment mode is set, the switch 71 is opened to prevent the fluctuation of the light receiving level during adjustment in the circuit in the subsequent stage from being generated as fire information to the receiver or the like. 5
3 is manually adjusted to adjust the light receiving level, and the optical axis is adjusted by moving the optical system support 30 by hand instead of the above-mentioned motor (step S22). When the manual adjustment of the optical axis and the manual adjustment of the light receiving level are completed, the power is once turned off, and then the process returns to step S1 to turn on the power (step S23).

If the monitor mode is set in step S21, the switch 71 is closed, the light receiving level is measured (step S31), and the light receiving level measured by the light receiving level determination circuit 72 and the appropriate level storage circuit 73 are stored. It is determined whether the received light level is within the proper level range by comparing it with the appropriate level (step S6). If it is within the proper level range, the inhibition of the acceleration sensor interrupt process is released (step S7). In step S8, the normal fire monitoring state as described above is entered. On the other hand, if the light receiving level is not within the proper level range in step S6, that is,
If the received light level deviates from the initially adjusted value, it is determined that the function of the sensor is not normal, "abnormal" is displayed on the received light level display circuit 74, and an abnormal signal is sent to the receiver via the information transmission circuit 61 ( Step S9). Then, the fire monitoring function is stopped (step S10).

In such a fire monitoring state, when the sensor receives acceleration or vibration due to a shock or the like, the acceleration sensor 63 detects this and the acceleration sensor interrupt process is started (step S11). Then, the next acceleration sensor interruption is prohibited until one cycle of processing is completed (step S12), and the light receiving level is measured in the same manner as described above (step S32). Then, the light receiving level determination circuit 72
The light-reception level measured in step 3 is compared with the proper level stored in the proper-level storage circuit 73 to determine whether the light-reception level is within the proper level range (step S33). If it is not within the proper level range. However, it is considered that the sensor receives acceleration or vibration due to the above-mentioned shock or the like, and the optical axis or the light receiving level is deviated, and the function of the sensor is not normal, and “abnormal” is given to the light receiving level display circuit 74. While displaying, an abnormal signal is sent to the receiver through the information transmission circuit 61 (step S
9) Then, the fire monitoring function is stopped (step S).
10).

On the other hand, if the light receiving level is within the proper level range in step S33, the prohibition of the acceleration sensor interrupt processing is released (step S18), and the normal fire monitoring state is restored (step S19). Thus, in this embodiment, even in the case of a sensor without the automatic optical axis adjustment, the automatic light receiving level adjustment and the sensitivity test function, the light receiving level is significantly higher than the initially adjusted value based on the output of the acceleration sensor. It is possible to manually check if there is any deviation and manually adjust the optical axis or the light receiving level of the sensor that has gone wrong due to shock or other factors.

[0048]

As described above, according to the present invention, the light-transmitting portion for emitting light at a predetermined interval and the light-transmitting portion provided so as to face the light-transmitting portion with the smoke detection space interposed therebetween. In a photoelectric sensor for detecting the presence or absence of smoke in the smoke detection space by changing the amount of light received by the light receiving unit, a shock to the sensor or in the vicinity thereof is detected. Since the detection means is provided and normal fire monitoring is stopped based on the output of the detection means to perform self-diagnosis, a non-fire alarm may be issued even if it is not a fire, or a false alarm may occur. This has the effect of preventing it, improving the reliability of the sensor, and being particularly useful for a separation type photoelectric sensor.

Further, it has a light-transmitting section for emitting light at a predetermined interval, and a light-receiving section provided opposite to the light-transmitting section with a smoke detecting space interposed therebetween, for receiving light from the light-transmitting section. A photoelectric sensor that detects the presence or absence of smoke in the smoke detection space when the amount of light received by the light receiver changes, and is provided in or near the sensor, and is a detection means for detecting an impact on the sensor and the output of the detection means. Since the adjustment means for performing at least one of the optical axis adjustment and the light receiving level adjustment based on the Can be automatically readjusted, the occurrence of non-fire alarms and loss of alarms can be prevented, and the reliability of the sensor can be improved.

Further, it has a light-transmitting section for emitting light at a predetermined interval, and a light-receiving section provided opposite to the light-transmitting section with a smoke detection space interposed therebetween, for receiving light from the light-transmitting section. A photoelectric sensor that detects the presence or absence of smoke in the smoke detection space when the amount of light received by the light receiver changes, and is provided in or near the sensor, and is a detection means for detecting an impact on the sensor and the output of the detection means. Since a sensitivity test means for performing a sensitivity test based on the above is provided, and at least one of the optical axis adjustment and the received light level adjustment is manually performed based on the output of the sensitivity test means, it is possible to detect when a shock or the like is given. It is possible to readjust the misaligned optical axis adjustment and received light level adjustment by detecting vibration applied to the detector, prevent non-fire alarms from being generated or lost, and improve the reliability of the detector.

Further, it has a light-transmitting section for emitting light at a predetermined interval, and a light-receiving section provided to face the light-transmitting section with a smoke detection space interposed therebetween and for receiving light from the light-transmitting section. A photoelectric sensor that detects the presence or absence of smoke in the smoke detection space when the amount of light received by the light receiver changes, and is provided in or near the sensor, and is a detection means for detecting an impact on the sensor and the output of the detection means. Since the light receiving level measuring means for measuring the light receiving level based on the light receiving level measuring means is provided and at least one of the optical axis adjustment and the light receiving level adjustment is manually performed based on the output of the light receiving level measuring means, there is no adjustment function. Even in the case of a sensor, it is possible to manually readjust the incorrect optical axis adjustment and received light level adjustment by detecting the vibration applied to the sensor when a shock etc. is given, preventing the occurrence of non-fire alarms and loss of alarms. Can improve the reliability of the sensor There is a cormorant effect.

Further, since it has means for generating an abnormal signal when the sensor is abnormal in relation to the output of the detecting means,
Even if the readjustment is not possible, there is an effect that at least it is not a fire but it can inform that the sensor is abnormal.

[Brief description of the drawings]

FIG. 1 is a top view showing an embodiment of a photoelectric sensor according to the present invention.

FIG. 2 is a side view showing an embodiment of the photoelectric sensor according to the present invention with a part cut away.

FIG. 3 is a perspective view showing a main part of an embodiment of a photoelectric sensor according to the present invention.

FIG. 4 is a plan view and a cross-sectional view showing another example of the main part of an embodiment of the photoelectric sensor according to the present invention.

FIG. 5 is a circuit diagram showing an embodiment of a photoelectric sensor according to the present invention.

FIG. 6 is a flowchart for explaining the operation of the embodiment of the photoelectric sensor according to the present invention.

FIG. 7 is a circuit diagram showing another embodiment of the photoelectric sensor according to the present invention.

FIG. 8 is a flowchart for explaining the operation of another embodiment of the photoelectric sensor according to the present invention.

FIG. 9 is a circuit diagram showing another embodiment of the photoelectric sensor according to the present invention.

FIG. 10 is a flowchart for explaining the operation of another embodiment of the photoelectric sensor according to the present invention.

[Explanation of symbols]

 3 Optical System Support 4 Optical System 10 Horizontal Motor 11 Vertical Motor 18,63 Acceleration Sensor 40, 40A Light Transmitter 42 Light Emitting Diode 50, 50A, 50B Light Receiver 51 Photodiode 53 Input Adjustment Resistor 54 Operational Amplifier 57 Sample・ Hold circuit 58 A / D conversion circuit 59 Fire judgment circuit 60 Memory circuit 61 Information transmission circuit 63 Accelerometer 64 Interrupt signal generator 65,71 Switch 72 Light reception level judgment circuit 73 Appropriate level memory circuit 74 Light reception level display circuit

Claims (6)

[Claims] 1. A light-transmitting portion that emits light at a predetermined interval, and a light-receiving portion that is provided to face the light-transmitting portion with a smoke detection space interposed therebetween and that receives light from the light-transmitting portion. In the photoelectric sensor that senses the presence or absence of smoke in the smoke detection space by changing the amount of light received by the light receiving unit, detection means for detecting an impact on the sensor is provided at or near the sensor, A photoelectric sensor characterized in that normal fire monitoring is stopped based on the output of the detection means to perform self-diagnosis. 2. A light-transmitting portion that emits light at a predetermined interval, and a light-receiving portion that is provided to face the light-transmitting portion with a smoke detection space interposed therebetween and that receives light from the light-transmitting portion. However, in a photoelectric sensor that detects the presence or absence of smoke in the smoke detection space by changing the amount of light received by the light receiving unit, a detector that is provided in the sensor or in the vicinity thereof and that detects impact on the sensor, A photoelectric sensor, which comprises at least one of an optical axis adjustment and a light receiving level adjustment based on the output of the detecting means. 3. The photoelectric sensor according to claim 2, which has a sensitivity adjusting function. 4. A light-transmitting portion that emits light at a predetermined interval, and a light-receiving portion that is provided to face the light-transmitting portion with a smoke detection space interposed therebetween and that receives light from the light-transmitting portion. However, in a photoelectric sensor that detects the presence or absence of smoke in the smoke detection space by changing the amount of light received by the light receiving unit, a detector that is provided in the sensor or in the vicinity thereof and that detects impact on the sensor, A sensitivity test means for performing a sensitivity test based on the output of the detection means, and at least one of optical axis adjustment and light reception level adjustment is manually performed based on the output of the sensitivity test means. Photoelectric sensor that does. 5. A light-transmitting portion that emits light at a predetermined interval, and a light-receiving portion that is provided to face the light-transmitting portion with a smoke detection space interposed therebetween and that receives light from the light-transmitting portion. However, in a photoelectric sensor that detects the presence or absence of smoke in the smoke detection space by changing the amount of light received by the light receiving unit, a detector that is provided in the sensor or in the vicinity thereof and that detects impact on the sensor, A light receiving level measuring means for measuring a light receiving level based on the output of the detecting means, and at least one of the optical axis adjustment and the light receiving level adjustment is manually performed based on the output of the light receiving level measuring means. Photoelectric sensor characterized by. 6. The photoelectric sensor according to claim 1, further comprising means for generating an abnormal signal when the sensor is abnormal in relation to the output of the detecting means.