JPH10188167A - Photoelectric separation type sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photoelectric separation type sensor capable of easily testing sensitivity even at the time of being attached at a high place. SOLUTION: In this photoelectric separation type sensor for detecting a fire by utilizing the fact that light radiated from a light sending part is reduced by the smoke of a fire intruding on an optical path and the light receiving quantity of a light receiving part 5 is reduced, a light reduction filter 11 rotated by the drive of a pulse motor 13 by receiving electric signals from an external controller is provided. The area of a light reduction rate corresponding to at least an operation test and a non-operation test is formed at the light reduction filter 11, and by sensitivity test start signals from the external controller, the pulse motor 13 is driven, the area of the light reduction rate corresponding to the operation test and the non-operation test is matched with an optical axis and the sensitivity is tested.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photoelectric separation type sensor for detecting smoke caused by a fire.

[0002]

2. Description of the Related Art A photoelectric separation type sensor includes a light transmitting unit for emitting light and a light receiving unit for receiving the emitted light, and the amount of light received by the light receiving unit when fire smoke enters the optical path. The detection of a fire is based on the decrease in the number of fires. FIG. 6 shows an example of a photoelectric separation type sensor. In FIG. 6, the light transmitting unit 1 includes a light emitting unit 2, a light transmitting unit lens 3, and a light transmitting unit cover 4. On the other hand, the light receiving unit 5 includes a light receiving element 6, a light receiving unit lens 7, and a light receiving unit cover 8. The light transmitting unit 1 and the light receiving unit 5 are installed so as to face each other at a predetermined distance as shown in the drawing.

When the smoke 9 caused by a fire enters the optical path between the light transmitting section 1 and the light receiving section 5, the photoelectric separation type sensor configured as described above has a light receiving element 6 provided in the light receiving section 5. The output of the light receiving element 6 changes, and the occurrence of a fire can be detected.

[0004]

When a sensitivity test of the photoelectric separation type sensor described above is performed, the sensitivity test filter 10 is connected to the light receiving cover 8 of the light receiving section 5 as shown in FIG. This is done by inserting it into the optical path by placing it in front of the camera and checking whether the photoelectric separation type sensor is working or not. As the sensitivity test filter 10, eight types of sensitivity test filters having different extinction rates according to the installation distance and the type of the photoelectric separation type sensor were used. Table 1 shows a list of filters used for sensitivity tests.

[0005]

[Table 1]

[0006] The one-type operation test and the two-type operation test shown in Table 1 above were performed using the filter 10 for sensitivity test of the extinction ratio shown in the table.
In this test, the optical path (optical axis) is blocked and the operation is confirmed within about 30 seconds. In the non-operation test, the optical path (optical axis) is blocked by the sensitivity test filter with the dimming rate shown in the table for about 30 seconds. It was a test to confirm that it did not work. When the installation location of the photoelectric separation type sensor is too high to reach the sensitivity test filter, the sensitivity test filter 10 is attached to a pole 10a such as a sensor attachment / detachment tool as shown in FIG. 7B. Was. When such a photoelectric separation type sensor is mounted at a high place, a sensitivity test is difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a photoelectric separation type sensor capable of easily performing a sensitivity test even when mounted at a high place. It is in.

[0008]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, light radiated from a light transmitting unit is reduced by smoke of a fire that has entered an optical path and is reduced by a light receiving unit. In a photoelectric separation type sensor that detects a fire by using a decrease in the amount of received light, a darkening filter that rotates by driving a pulse motor in response to an electric signal from an external control device is provided, and the darkening filter is At least an area of the dimming rate corresponding to the operation test and the non-operation test is formed, and the pulse motor is driven by the sensitivity test start signal from the external control device to drive the pulse motor and the dimming rate corresponding to the operation test and the non-operation test The sensitivity test is performed by adjusting the area of に to the optical axis.

In the invention according to claim 2, the neutral density filter is arranged corresponding to the opening of the light receiving unit cover.

According to the third aspect of the present invention, there is provided a neutral density filter having a dimming rate area corresponding to an operation test, a non-operation test, and normal monitoring.

According to the fourth aspect of the present invention, the neutral density filter has at least 10%, 20%, 30%, 40%, 50% or less.
%, 60%, 70%, 80%.

According to a fifth aspect of the present invention, a plurality of neutral density filters that are individually driven to rotate are provided, and the 10%, 20%
%, 30%, 40%, 50%, 60%, 70%, 80%
Are provided for each of the neutral density filters.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described in detail with reference to FIGS. Members having substantially the same functions as those of the conventional example are denoted by the same reference numerals.

In FIG. 1, the light receiving section 5 includes a light receiving element 6, a light receiving section lens 7, and a light receiving section cover 8. The light-receiving cover 8 has a circular opening on the front surface thereof.
Is arranged. The neutral density filter 11 has a connecting portion 12 such as a gear on the back surface. The connecting portion 12 is connected to the pulse motor 13, and also has a connecting portion 14 formed with a gear or the like on the pulse motor 13 side.

As shown in FIGS. 2 (a) and 2 (b), the neutral density filter 11 has a circular shape and forms three areas having different neutralization rates. The area A has a dimming rate in a normal monitoring state, and has the same dimming rate as the light receiving unit cover 8. It has sufficient translucency with respect to the emission wavelength of the light-emitting element 2 and is colored slightly dark gray so that the internal members are hardly visible to the naked eye. The material is a flame-retardant AS resin or the like.

The area B is formed at a dimming rate to be subjected to an operation test. The area C is formed at a dimming rate to be subjected to a non-operation test. For example, the area B has a dimming rate of 30% and the area C has a dimming rate of 10%.
m.

On the other hand, as shown in FIG. 3, the light receiving section 5 is connected to a fire receiver 15 and a remote check switch 16 so that a sensitivity test can be performed from outside the fire receiver 15 and the remote check switch 16 or the like. A start signal is transmitted, and the light receiving unit 5 receives the start signal to start an operation test and a non-operation test. In the operation test, the pulse motor 13 rotates the neutral density filter 11 by a predetermined angle so that the area B is located at the position of the optical axis P, as shown in FIGS. Thereafter, the light emitting element 2 is caused to emit light, and the light receiving element 6 detects the light, and an operation test is performed. The waiting time is about 30 seconds. During this time, if an operation confirmation light (not shown) indicating that the photoelectric separation type sensor has been operated is turned on, the process proceeds to the next step. If it does not operate within about 30 seconds, it is determined that the sensitivity is poor.

Next, the operation proceeds to the non-operation test. In any of the above good and bad cases, the pulse motor 13 is driven again to adjust the area C of the neutral density filter 11 to the position of the optical axis P,
The light emitting element 2 emits light, which is detected by the light receiving element 6,
A failure test is performed. Approximately 30 seconds as a standby time, during which the operation confirmation light (not shown) of the photoelectric separation type sensor 1
If is not lit, the non-operation test is determined to be good.

Thereafter, when a test end signal is received from the outside, the neutral density filter 11 rotates and the section A returns to the position of the optical axis P, and the apparatus enters a normal monitoring state.

Next, a second embodiment shown in FIGS. 4 and 5 will be described. In this embodiment, the extinction ratio of 10%, 20%, 30%, 40%, 50%, 6
In this example, areas with respective extinction rates of 0%, 70%, and 80% are formed. This extinction ratio corresponds to all of the nominal monitoring distance and type of the photoelectric separation type sensor. FIG. 4 shows the use of two dimming filters 21 and 22. The front dimming filter 21 is divided into zone D, zone E, zone F, zone G, and zone H according to different dimming rates. Have been. Area D is the dimming rate in the normal monitoring state. Area E is 1
0%, area F is 20%, area G is 30%, area H is 40
% Respectively. On the other hand, the rear dimming filter 22 is similarly divided into a section I, a section J, a section K, a section L, and a section M. The section I has a dimming rate in a normal monitoring state, the section J has 50%, Zone K is 60%, Zone L is 70%
% And the area M correspond to 80%, respectively.

The driving sources are also two pulse motors 23 and two pulse motors 2 corresponding to the neutral density filters 21 and 22.
4 are driven independently. When performing the sensitivity test, the test can be performed by appropriately combining the two neutral density filters 21 and 22 according to the nominal monitoring distance, type, and operation / non-operation of the photoelectric separation type sensor. .
For example, a nominal monitoring distance of 20 to 30 m in Table 1, an operation test 2
In the case of a seed, since the dimming rate is 60%, the zone D (normal monitoring state) and the zone K (60%) overlap the optical axis P, and the operation test is performed. In this embodiment, the dimming rate is 10% to 80%.
%, It is possible to correspond to all of the nominal monitoring distance, type, and operation / non-operation of the photoelectric separation type sensor. Note that the light receiving unit cover 25 covers the entire surface, and the neutral density filters 21 and 22 are located inside. 26, 26 are connecting portions of this embodiment.

[0022]

According to the first aspect of the present invention, in the sensitivity test of the photoelectric separation type sensor, it is not necessary to perform the work at a high place, and the operation and non-operation tests are automatically performed sequentially. It has the effect of being able to.

According to the second aspect of the present invention, in addition to the effect of the first aspect, the neutral density filter can be visually observed during the operation test, and the sensitivity test is performed while confirming whether the operation test is being performed or the non-operation test is being performed. Is achieved.

According to the third aspect of the present invention, in addition to the effects of the first or second aspect, an operation test, a non-operation test, and a normal monitoring state are provided for one neutral density filter. In addition, the transition from the start of the test to the standby state can be performed in a short time, so that the test can be performed efficiently.

According to the fourth aspect of the present invention, there is an effect that a single dimming filter can cope with all of the nominal monitoring distance, the type, and the operation / non-operation test of the photoelectric separation type sensor.

According to the fifth aspect of the present invention, the necessary eight types of dimming rates are divided and disposed in a plurality of dimming filters. On the other hand, there is an effect that it can be widely secured.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a light receiving unit according to a first embodiment of the present invention.

FIG. 2 is a front view of a light receiving unit according to the first embodiment.

FIG. 3 is a system diagram of the same.

FIG. 4 is a front view of a light receiving unit according to a second embodiment of the present invention.

FIG. 5 is a partial cross-sectional view of the light receiving unit of the above.

FIG. 6 is an explanatory diagram showing an example of a conventional photoelectric separation type sensor.

FIG. 7 is an explanatory view showing a sensitivity test method for a conventional photoelectric separation type sensor.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 light transmitting unit 5 light receiving unit 8 light receiving unit cover 11 light reduction filter 13 pulse motor

Claims (5)

[Claims] 1. A photoelectric separation type sensor for detecting a fire utilizing the fact that light radiated from a light transmitting unit is dimmed by smoke of a fire entering an optical path and the amount of light received by a light receiving unit is reduced. Provide a dimming filter that rotates by driving a pulse motor in response to an electric signal from an external control device. The dimming filter forms at least a dimming rate area corresponding to the operation test and the non-operation test. A photoelectric separation type wherein the pulse motor is driven by a sensitivity test start signal from a device to perform a sensitivity test by adjusting an area of the dimming rate corresponding to an operation test and a non-operation test to an optical axis. sensor. 2. The photoelectric separation type sensor according to claim 1, wherein the neutral density filter is disposed corresponding to an opening of the light receiving unit cover. 3. The photoelectric separation type sensor according to claim 1, further comprising a dimming filter having a dimming rate area corresponding to an operation test, a non-operation test, and normal monitoring. 4. The darkening filter comprises at least 10%,
20%, 30%, 40%, 50%, 60%, 70%, 8
2. The photoelectric separation type sensor according to claim 1, wherein an area having a 0% extinction ratio is formed. 5. A plurality of neutral density filters that are individually driven to rotate, wherein said 10%, 20%, 30%, 40%, 50%
5. The photoelectric separation type sensor according to claim 4, wherein the areas having the respective extinction rates of%, 60%, 70%, and 80% are provided separately for the respective extinction filters.