Photoelectric separation type sensor

Abstract

To facilitate the work of an installation worker at the time of installing a photoelectric separation type sensor SOLUTION: The photoelectric separation type sensor of the present invention is a photoelectric separation type sensor which comprises a light transmitting unit having a light transmitter and a light receiving unit having a light receiver for receiving light transmitted by the light transmitter, and which senses smoke based on the amount of light received by the light receiver, characterized by comprising means for automatically measuring the light transmission distance between the light transmitter and the light receiver optically at the time of installation.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a photoelectric separation type detector that detects a fire by detecting the dimming caused by smoke from the fire. [Background technology]

[0002] A photoelectric separation type detector is a fire detector that detects smoke in large spaces such as gymnasiums, factories, atriums, tunnels, etc. As shown in Patent Document 1, a photoelectric separation type detector transmits light from a light transmitting unit to a light receiving unit, and detects smoke when smoke between the light transmitting unit and the light receiving unit prevents the light receiving unit from receiving the light. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-73591 Summary of the Invention [Problem to be solved by the invention]

[0004] When installing a photoelectric separation type detector, not only is it necessary to align the axes of the transmitter and receiver, but it is also necessary to set the light emission intensity of the transmitter. Although photoelectric separation type detectors are generally installed in large spaces, in order to accommodate a variety of spaces, photoelectric separation type detectors are designed to allow the light emission intensity of the transmitter to be set according to the distance between the transmitter and receiver. To set this, the installer needs to measure the distance between the transmitter and receiver.

[0005] An object of the present invention is to facilitate the work of an installer when installing a photoelectric separation type sensor. [Means for solving the problem]

[0006] In one embodiment of the present invention, the photoelectric separation type sensor comprises a light transmitting unit having a light transmitter and a light receiving unit having a light receiver that receives the light transmitted by the light transmitter, and is a photoelectric separation type sensor that detects smoke based on the amount of light received by the light receiver, and is characterized by being provided with a means for automatically measuring the light transmission distance between the light transmitter and the light receiver optically at the time of installation. [Effects of the Invention]

[0007] According to the present invention, the installer can set the light emission intensity of the light transmitter or automatically set the light emission intensity of the light transmitter based on the light transmission distance between the light transmitter and the light receiver obtained by measurement, thereby facilitating the installer's work when easily installing a photoelectric separation type sensor. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing the installation status of a conventional photoelectric separation type detector. [Figure 2] FIG. 1 is a diagram showing the configuration of a conventional fire detection system using a photoelectric separation type detector. [Figure 3] FIG. 1 is a diagram showing the configuration of a photoelectric separation type sensor according to a first embodiment. [Figure 4] FIG. 10 is a diagram showing the configuration of a photoelectric separation type sensor in a second embodiment. [Figure 5] FIG. 10 is a diagram showing the configuration of a photoelectric separation type sensor according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Before describing the embodiments of the present invention, a conventional example will be described. FIG. 1 shows the installation of a photoelectric separation type sensor 1. The photoelectric separation type sensor 1 is a conventional sensor. In the example shown in FIG. 1, the photoelectric separation type sensor 1, which includes a light receiving unit 11 and a light transmitting unit 12, is installed in an upper area inside gymnasium G. The photoelectric separation type sensor 1 transmits infrared laser light IR from the light transmitting unit 12 to the light receiving unit 11, and detects smoke when the light reaching the light receiving unit 11 is weakened by smoke. The light receiving unit 11 and the light transmitting unit 12 are connected by sensor wiring 13. The light receiving unit 11 is also connected to a fire receiver 3 by wiring 2. When the photoelectric separation type sensor 1 detects smoke, the smoke detection status is transmitted from the light receiving unit 11 to the fire receiver 3 via wiring 2. Although FIG. 1 shows one set of light receiving units 11, multiple sets can also be installed. As shown in FIG. 1, the photoelectric separation type sensor 1 can detect smoke in a large space. The installation location shown in FIG. 1 is an example, and the photoelectric separation type sensor 1 can be installed in an atrium, tunnel, or the like of a hotel or the like.

[0010] Figure 2 shows the configuration of a fire detection system using a conventional photoelectric separated type detector 1. The photoelectric separated type detector 1 has a light receiving unit 11, a light transmitting unit 12, and detector wiring 13 that connects the light receiving unit 11 and the light transmitting unit 12. The fire receiver 3 is connected to the light receiving unit 11 via a crossover wiring using wiring 2, and can be connected to multiple photoelectric separated type detectors 1. The light receiving unit 11 and the light transmitting unit 12 in Figure 2 are installed in separate locations, like the light receiving unit 11 and the light transmitting unit 12 in Figure 1, but for convenience they are shown close to each other in Figure 2.

[0011] The light receiving unit 11 has a power supply 111, a transmission circuit 112, a control circuit 113, a memory 114, a light emitting current circuit 115, a light receiver 116, an amplifier 117, and a setting device 118. The control circuit 113 is a CPU, and is connected to the transmission circuit 112, the memory 114, the light emitting current circuit 115, the amplifier 117, and the setting device 118 via a bus. The power line of the wiring 2 of the light receiving unit 11 is connected to the power supply 111, and the light receiving unit 11 obtains power for the photoelectric separation type detector 1. In addition, the transmission circuit 112 shorts the terminal connected to the wiring 2, thereby transmitting a smoke detection signal to the fire receiver 3. The setting device 118 is provided with a dip switch, and the installer can set the current value sent from the light emitting current circuit 115 by setting the dip switch.

[0012] The light-sending unit 12 includes a laser driving unit 121 and a light-sending device 122. The light-sending unit 12 is connected to the light-emitting current circuit 115 of the light-receiving unit 11 via the sensor wiring 13. When a current is supplied from the light-emitting current circuit 115 to the sensor wiring 13, the laser driving unit 121 operates and an infrared laser provided in the light-sending device 122 emits infrared laser light IR.

[0013] The light receiving unit 11 intermittently supplies current from the light emitting current circuit 115 to the light transmitting unit 12 via the sensor wiring 13. This causes the laser driving unit 121 of the light transmitting unit 12 to transmit infrared laser light IR from the light transmitter 122. The larger the current value, the stronger the infrared laser light IR transmitted from the light transmitter 122. When there is no smoke in the optical path of the infrared laser light IR from the light transmitter 122 to the receiver 116, the receiver 116 receives the infrared laser light IR. However, when there is a certain amount of smoke in the optical path, the amount of infrared laser light IR received by the receiver 116 becomes smaller than a predetermined value. When current is flowing from the light emitting current circuit 115 and the amount of light received by the receiver 116 is smaller than a predetermined value, the control circuit 113 shorts out wiring 2 in the transmission circuit 112, thereby notifying the fire control device 3 that smoke has been detected.

[0014] -Settings for installing a photoelectric separation type detector- An angle adjustment mechanism (not shown) is provided for each of the light receiver 116 and the light transmitter 122. When installing the photoelectric separation type sensor 1, the installer adjusts the directions of the light receiver 116 and the light transmitter 122 using these angle adjustment mechanisms, and aligns the optical axes of the light transmitter 122 and the light receiver 116.

[0015] Furthermore, during installation, the light emission intensity of the light transmitter 122 is set according to the light transmission distance D between the light receiving unit 11 and the light transmitting unit 12. Conventionally, when setting this, the installer measures the light transmission distance D between the light receiving unit 11 and the light transmitting unit 12 by some method, such as using a laser distance meter. Then, the installer switches the dip switches of the setting device 118 provided in the light receiving unit 11 based on the measurement results. Depending on the position of the multiple dip switches provided in the setting device 118, the light transmitter 122 can be set to one of a short-distance setting with low light emission intensity, a long-distance setting with high light emission intensity, or a medium-distance setting with light emission intensity between the short-distance setting and the long-distance setting. The installer switches the dip switches of the setting device 118 to the following settings based on the distance measured.

[0016] Light transmission distance D = 5 to 20 m: short distance setting (low light intensity) Light transmission distance D = 20-40m: Medium distance setting (medium light intensity) Light transmission distance D = 40 to 100 m: Long distance setting (high light intensity) The current value of the light emission current circuit 115 changes depending on the setting, among the short-distance setting, medium-distance setting, and long-distance setting, as described above. The current value is smaller for the short-distance setting than for the medium-distance setting, and the current value is larger for the long-distance setting than for the medium-distance setting. The intensity of the infrared laser light IR emitted from the light transmitter 122 changes depending on the current value. A large current value results in strong infrared laser light IR, and even if the light receiver 11 is far from the light transmitter 12, a sufficient amount of light can be received by the light receiver 116. [Example]

[0017] Fig. 3 shows the configuration of the photoelectric separated type detector 4 in Example 1. The installation situation of the photoelectric separated type detector 4 in Example 1 is the same as the installation situation of the conventional example shown in Fig. 1. The same is true for the wiring 2 and fire receiver 3 shown in Fig. 2. Note that the light receiving unit 41 and the light transmitting unit 42 in Fig. 3 are installed at separate positions like the light receiving unit 11 and the light transmitting unit 12 in Fig. 1, but are shown close to each other in Fig. 3 for convenience.

[0018] The photoelectric separated type detector 4 includes a light receiving unit 41, a light transmitting unit 42, and detector wiring 43 connecting the light receiving unit 41 and the light transmitting unit 42. When multiple sets of photoelectric separated type detectors 4 are installed, the fire receiver 3 can be connected to the light receiving unit 41 by a crossover wiring using wiring 2, thereby installing multiple photoelectric separated type detectors 4. The light receiving unit 41 includes a power supply 411, a transmitting circuit 412, a control circuit 413, a memory 414, a light emitting current circuit 415, a photodetector 416, and an amplifier 417.

[0019] The control circuit 413 is a CPU, and is connected to the transmission circuit 412, memory 414, light emitting current circuit 415, and amplifier 417 via a bus. The power line of wiring 2 of the light receiving unit 41 is connected to the power supply 411, and the light receiving unit 41 obtains power for the photoelectric separation type detector 4. The transmission circuit 412 also short-circuits the terminal connected to wiring 2, thereby transmitting a smoke detection to the fire receiver 3. The infrared laser light IR received by the receiver 416 is amplified and digitized by the amplifier 417, and the amount of light received by the receiver 416 is transmitted to the control circuit 413.

[0020] The light-sending unit 42 includes a laser driving unit 421, a light-sending device 422, and a replying unit 423. The light-sending unit 42 is connected to the light-emitting current circuit 415 of the light-receiving unit 41 by the sensor wiring 43. When a current is supplied from the light-emitting current circuit 415 to the sensor wiring 43, the laser driving unit 421 operates and an infrared laser provided in the light-sending device 422 emits infrared laser light IR of an intensity according to the current value.

[0021] In the light receiving unit 41, current is intermittently supplied from the light emitting current circuit 415 to the light transmitting unit 42 via the sensor wiring 43. This causes the laser driving unit 421 of the light transmitting unit 42 to transmit infrared laser light IR from the light transmitter 422. When there is no smoke in the optical path of the infrared laser light IR from the light transmitter 422 to the receiver 416, the infrared laser light IR is received by the receiver 416. However, when there is a certain amount of smoke in the optical path, the amount of infrared laser light IR received by the receiver 416 becomes smaller than a predetermined value. When current is flowing from the light emitting current circuit 415 and the amount of light received by the receiver 416 is smaller than a predetermined value, the control circuit 413 shorts out wiring 2 in the transmission circuit 412, and notifies the fire control device 3 that smoke has been detected.

[0022] -Settings for installing a photoelectric separation type detector- An angle adjustment mechanism (not shown) is provided for each of the light receiver 416 and the light transmitter 422. When installing the photoelectric separation type sensor 4, the installer adjusts the directions of the light receiver 416 and the light transmitter 422 using these angle adjustment mechanisms, and sets the optical axes of the light transmitter 422 and the light receiver 416 to be aligned.

[0023] At the time of installation, the light emission intensity of the light transmitter 422 in the light transmitting unit 42 is also set. To this end, the control circuit 413 (1) calculates the sensor wiring transmission time LT of the sensor wiring 43, which is the transmission line. Then, (2) calculates the reaction time RT from when the light-emitting current circuit 415 starts to flow current until the light receiver 416 receives light. Next, (3) the sensor wiring transmission time LT is subtracted from the reaction time RT to obtain the light transmission time ST from the light transmitter 422 to the light receiver 416. Finally, (4) the light transmission distance D from the light transmitter 422 to the light receiver 416 is calculated from the light transmission time ST. (1) to (4) will be described in detail below.

[0024] (1) Calculation of sensor wiring transmission time LT In the first embodiment, when a photoelectric separation type sensor 4 is installed in an installation location such as that shown in Fig. 1, the sensor wiring transmission time LT of the sensor wiring 43, which is a transmission line, is calculated. To do this, the control circuit 413 causes a pulse current to flow from the light-emitting current circuit 415. The pulse current that reaches the light-transmitting unit 42 is returned by the return unit 423 and returns to the light-emitting current circuit 415. The control circuit 413 detects the time from when the pulse current is transmitted until when it is returned, and stores half of that time in the memory 414 as the sensor wiring transmission time LT.

[0025] The light-emitting current circuit 415 may calculate the sensor wiring transmission time LT using reflection of the transmission line. In this case, in order to reflect at the end of the transmission line, the return unit 423 temporarily sets the end of the sensor wiring 43 on the light-transmitting unit 42 side to an impedance different from that of the light-emitting current circuit 415. Then, the supply of current or voltage begins. As a result, the current, etc. is reflected by the return unit 423 and returns to the light-emitting current circuit 415. Therefore, under the control of the control circuit 413, the time until the current, etc. returns to the light-emitting current circuit 415 is measured, and half of that time is stored in the memory 414 as the sensor wiring transmission time LT.

[0026] (2) Calculation of reaction time (RT) The control circuit 413 causes a current to flow from the light-emitting current circuit 415, driving the laser driving unit 421 to emit infrared laser light IR from the light transmitter 422. The time from the emission of current from the light-emitting current circuit 415 to the reception of the infrared laser light IR by the light receiver 416 is stored in the memory 414 as a response time RT. The response time RT is mainly made up of a sensor wiring transmission time LT for transmitting the infrared laser light IR through the sensor wiring 43 from the light-emitting current circuit 415 to the light transmitter 42, and a light transmission time ST from the time the infrared laser light IR is emitted from the light transmitter 422 to the time it is received by the light receiver 416.

[0027] (3) Calculation of light transmission time ST Light transmission time ST = Response time RT - Sensor wiring transmission time LT At this time, correction can be made taking into consideration delays in the light receiving unit 41 and the light transmitting unit 42, etc.

[0028] (4) Calculation of light transmission distance D The light transmission distance D from the light transmitter 422 to the light receiver 416 is calculated from the light transmission time ST.

[0029] Depending on the calculated light transmission distance D, the light emission intensity is set to one of short distance, medium distance, and long distance as follows, and stored in memory 414. Light transmission distance D = 5 to 20 m: short distance setting (low light intensity) Light transmission distance D = 20-40m: Medium distance setting (medium light intensity) Light transmission distance D = 40 to 100 m: Long distance setting (high light intensity) The current value of the light emission current circuit 115 changes depending on the setting, among the short-distance setting, medium-distance setting, and long-distance setting, as described above. The current value is smaller for the short-distance setting than for the medium-distance setting, and larger for the long-distance setting than for the medium-distance setting. The emission intensity of the infrared laser light IR emitted from the light transmitter 422 changes depending on the current value. Since the emission intensity of the infrared laser light IR is high when the current value is high, even if the light receiver 41 is far from the light transmitter 42, a sufficient amount of light can be received by the light receiver 416. Note that the emission intensity of the light transmitter 422 when acquiring the light transmission time ST can be set to the long-distance setting (high emission intensity), which is the maximum emission intensity among the multiple emission intensity levels that can be set, from the short-distance setting (low emission intensity) to the long-distance setting (high emission intensity), thereby ensuring reliable acquisition of the light transmission time ST.

[0030] As described above, the photoelectric separation type sensor 4 in Example 1 optically measures the light-transmitting distance D between the light transmitter 422 and the light receiver 416, and automatically sets the emission intensity of the light transmitter 422 according to the measured light-transmitting distance D. The distance between the light transmitter 422 and the light receiver 416 is the distance between the light-receiving unit 41 and the light-transmitting unit 42, which is the light-transmitting distance D. [Example]

[0031] Figure 4 shows the configuration of the photoelectric separated type detector 5 in Example 2. The installation situation of the photoelectric separated type detector 5 in Example 2 is the same as the installation situation of the conventional example shown in Figure 1. The same is true for the wiring 2 and fire receiver 3 shown in Figure 2. Note that the light receiving unit 51 and the light transmitting unit 52 in Figure 4 are installed at separate positions like the light receiving unit 11 and the light transmitting unit 12 in Figure 1, but are shown close to each other in Figure 4 for convenience.

[0032] The photoelectric separated type detector 5 includes a light receiving unit 51, a light transmitting unit 52, and detector wiring 53 connecting the light receiving unit 51 and the light transmitting unit 52. When multiple sets of photoelectric separated type detectors 5 are installed, the fire receiver 3 can be connected to the light receiving unit 51 by a crossover wiring using wiring 2, thereby installing multiple photoelectric separated type detectors 5. The light receiving unit 51 includes a power supply 511, a transmitting circuit 512, a control circuit 513, a memory 514, a light emitting current circuit 515, a photodetector 516, an amplifier 517, a laser distance meter 518, and an angle adjustment housing 519.

[0033] The control circuit 513 is a CPU, and is connected to the transmission circuit 512, memory 514, light-emitting current circuit 515, amplifier 517, and laser rangefinder 518 via a bus. The light-receiving unit 51 receives power from the photoelectric separation detector 5 through a power supply 511 via the power line of wiring 2. The transmission circuit 512 shorts the terminal connected to wiring 2, thereby transmitting a smoke detection signal to the fire receiver 3. The infrared laser light IR received by the receiver 516 is amplified and digitized by the amplifier 517, and the amount of light received by the receiver 516 is transmitted to the control circuit 513. The laser rangefinder 518 uses visible laser light VR. The receiver 516 and laser rangefinder 518 are mounted in an angle-adjustable housing 519, and the directions of the receiver 516 and laser rangefinder 518 are adjusted together by moving the angle-adjustable housing 519 using an angle adjustment mechanism (not shown).

[0034] The light-transmitting unit 52 includes a laser driving unit 521 and a light transmitter 522. The light-transmitting unit 52 is connected to a light-emitting current circuit 515 of the light-receiving unit 51 by a sensor wiring 53. When a current is supplied from the light-emitting current circuit 515 to the sensor wiring 53, the laser driving unit 521 operates and an infrared laser provided in the light transmitter 522 emits infrared laser light IR.

[0035] In the light receiving unit 51, current is intermittently supplied from the light emitting current circuit 515 to the light transmitting unit 52 via the sensor wiring 53. This causes the laser driving unit 521 of the light transmitting unit 52 to transmit infrared laser light IR from the light transmitter 522. When there is no smoke in the optical path of the infrared laser light IR from the light transmitter 522 to the receiver 516, the infrared laser light IR is received by the receiver 516. On the other hand, when there is a certain amount of smoke in the optical path, the amount of infrared laser light IR received by the receiver 516 becomes smaller than a predetermined value. When the amount of light received by the receiver 516 is smaller than a predetermined value while current is flowing from the light emitting current circuit 515, the control circuit 513 shorts out wiring 2 in the transmission circuit 512, and notifies the fire control device 3 that smoke has been detected.

[0036] -Settings for installing a photoelectric separation type detector- The light receiver 516 and the light transmitter 522 are each provided with an angle adjustment mechanism (not shown). When installing the photoelectric separation type sensor 5, an installer uses these angle adjustment mechanisms to adjust the direction of the light receiver 516 and the light transmitter 522, thereby aligning the optical axes of the light transmitter 522 and the light receiver 516. The light receiver 516 is mounted in an angle-adjustable housing 519 together with a laser rangefinder 518. During measurement, the laser rangefinder 518 shines visible laser light VR on the measurement target. By adjusting the direction of the angle-adjustable housing 519 using the angle adjustment mechanism to shine the visible laser light VR on the light transmitter 52, the installer can visually check the location where the visible laser light VR is shining, and can easily align the direction of the angle-adjustable housing 519. Since the light receiver 516 is also mounted in the angle-adjustable housing 519, the light receiver 516 also faces the direction of the light transmitter 522, thereby aligning the optical axis. On the other hand, the optical axis of the light transmitter 522 is aligned by an angle adjustment mechanism provided in the light sending unit 52 in the same manner as in the conventional case.

[0037] In the second embodiment, the light emission intensity of light transmitter 522 in light transmitting unit 52 is automatically set inside light receiving unit 51 by measuring light transmission distance D between light transmitter 52 and light receiving unit 52 using laser distance meter 518. Light transmission distance D from light transmitter 522 to light receiving unit 516 is approximately the same as the distance from laser distance meter 518 to the surface of light transmitting unit 52. After light transmission distance D is measured by laser distance meter 518, one of short distance setting, medium distance setting, and long distance setting is set in memory 514 under the control of control circuit 513, and the light emission intensity of light transmitter 522 is set, as in the first embodiment.

[0038] As described above, in the second embodiment as well, the light-transmitting distance D between the light transmitter 522 and the light receiver 516 is optically measured at the time of installation, and the light emission intensity of the light transmitter 522 is automatically set according to the measured light-transmitting distance D. Furthermore, in the second embodiment, the laser distance meter 518 of the photoelectric separation type sensor 5 can measure the light-transmitting distance D between the light receiver 51 and the light transmitter 52 and simultaneously align the optical axis of the light receiver 516 by using the visible laser light VR. [Example]

[0039] FIG. 5 shows the configuration of a photoelectric separated type detector 6 in Example 3. The installation state of the photoelectric separated type detector 6 in Example 3 is the same as that of the conventional example shown in FIG. 1. However, the light receiving unit 11 becomes a light transmitting and receiving unit 61, a reflector 62 (described later) is provided at the position of the light transmitting unit 12, and there is no component equivalent to the detector wiring 13. The light transmitting and receiving unit 61 functions as a light transmitting unit and a light receiving unit. The wiring 2 and fire receiver 3 shown in FIGS. 1 and 2 are the same. Note that the light transmitting and receiving unit 61 and reflector 62 in FIG. 5 are installed at separate positions like the light receiving unit 11 and light transmitting unit 12 in FIG. 1, but are shown close to each other in FIG. 5 for convenience.

[0040] The photoelectric separated type sensor 6 includes a light transmitting and receiving unit 61 and a reflector 62. When multiple sets of photoelectric separated type sensors 6 are installed, the fire control device 3 can be connected to the light transmitting and receiving unit 61 via a crossover wiring using the wiring 2, thereby installing multiple photoelectric separated type sensors 6. The light transmitting and receiving unit 61 includes a power supply 611, a transmitting circuit 612, a control circuit 613, a memory 614, a light receiver 616, an amplifier 617, and an angle adjustment housing 618. The light transmitting and receiving unit 61 of the third embodiment further includes a light transmitter 615.

[0041] The control circuit 613 is a CPU, and is connected to the transmission circuit 612, memory 614, light transmitter 615, and amplifier 617 via a bus. The light transmitter / receiver unit 61 obtains power from the power line of wiring 2, which is connected to the power supply 611. The transmission circuit 612 also shorts the terminal connected to wiring 2, thereby transmitting a smoke detection signal to the fire receiver 3. The infrared laser light IR received by the receiver 616 is amplified and digitized by the amplifier 617, and the amount of light received by the receiver 616 is transmitted to the control circuit 613. The light transmitter 615 and the light receiver 616 are mounted on an angle-adjustable housing 618, and the directions of the light transmitter 615 and the light receiver 616 are adjusted together by moving the angle-adjustable housing 618 using an angle adjustment mechanism (not shown).

[0042] In the light transmitting / receiving unit 61, infrared laser light IR is intermittently transmitted from the light transmitter 615. When there is no smoke in the optical path of the infrared laser light IR from the light transmitter 615 to the light receiver 616, the infrared laser light IR is reflected by the reflector 62 and received by the light receiver 616. On the other hand, when there is a certain amount of smoke in the optical path, the amount of infrared laser light IR received by the light receiver 616 becomes smaller than a predetermined value. When the amount of light received by the light receiver 616 is smaller than a predetermined value while the infrared laser light IR is being transmitted from the light transmitter 615, the control circuit 613 shorts out the wiring 2 using the transmission circuit 612, and notifies the fire control signal 3 that smoke has been detected.

[0043] -Settings for installing a photoelectric separation type detector- The light transmitter 615 and the light receiver 616 are mounted on an angle-adjustable housing 618 of the light transmitting and receiving unit 61. An installer adjusts the angles using an angle adjustment mechanism (not shown) provided in the angle-adjustable housing 618, thereby directing the light transmitter 615 and the light receiver 616 toward the reflector 62. The direction of the reflector 62 is also adjusted so that the infrared laser light IR returns to the light receiver 616 of the light transmitting and receiving unit 61. If the reflector 62 is a retroreflector, angle adjustment of the reflector 62 becomes almost unnecessary.

[0044] Furthermore, the light emission intensity of light transmitter 615 is set as follows. When alignment is performed by the angle adjustment mechanism via angle adjustment housing 618, a light transmission distance D of the round trip between light transmitting and receiving unit 61 and reflector 62 is measured from the delay time of the infrared laser light IR from when it is transmitted by light transmitter 615 until it is received by light receiver 616. Since the optical path of the infrared laser light IR is twice the distance between light transmitting and receiving unit 61 and reflector 62, light transmission distance D is also twice the distance between light transmitting and receiving unit 61 and reflector 62. Then, as in the first and second embodiments, one of a short distance setting, a medium distance setting, and a long distance setting is set in memory 614 from the light transmission distance D obtained by control of control circuit 513, and the light emission intensity of light transmitter 615 is set.

[0045] As described above, in the third embodiment, the light transmitting and receiving unit 61 having the light transmitter 615 and the light receiver 616 of the photoelectric separation type sensor 6 functions as a laser distance meter. The photoelectric separation type sensor 6 measures the light transmission distance D, which is twice the distance between the light transmitting and receiving unit 61 and the reflector 62, based on the arrival time of the infrared laser light IR, sets this in the photoelectric separation type sensor 6, and automatically sets the light emission intensity of the light transmitter 615. In the third embodiment as well, the light transmission distance D between the light transmitter 615 and the light receiver 616 is optically measured at the time of installation, and the light emission intensity of the light transmitter 615 is automatically set according to the measured light transmission distance D.

[0046] In the first to third embodiments, the photoelectric separated sensors 4 to 6 automatically set the light emission intensity of the light transmitters 422, 522, 615 in accordance with the automatically measured light transmission distance D. However, the process of setting the light emission intensity may be performed manually. In this case, the light transmission distance D between the light transmitters 422, 522, 615 and the light receivers 416, 516, 616 is automatically measured and displayed on a display device (not shown) provided on the light receivers 416, 516, 616, etc. Then, the installer manually sets the light emission intensity of the light transmitters 422, 522, 615 in accordance with the displayed light transmission distance D by operating a dip switch, for example.

[0047] In the first and second embodiments, the wiring 2 is connected to the light receiving units 41 and 51, but the wiring 2 may be connected to the light transmitting unit. Furthermore, the laser distance meter 518 provided in the light receiving unit 51 in the second embodiment may be provided in the light transmitting unit 52. In this configuration and in the second embodiment, a laser distance meter using visible laser light VR is provided in either the light transmitting unit or the light receiving unit, and the laser distance meter irradiates the visible laser light VR on the other of the light transmitting unit or the light receiving unit. Furthermore, in the first and second embodiments, the light emission intensity of the light transmitter 422 is changed by changing the current value of the current intermittently supplied from the light emitting current circuits 415 and 515, but the light emission intensity may be changed by other methods, such as changing the resistance value of the laser driving units 421 and 521.

[0048] Furthermore, the specific configuration is not limited to the embodiments, and the present invention includes design changes within the scope of the gist of the present invention. Furthermore, the above-mentioned examples and modifications can be combined by utilizing each other's technology as long as there are no particular contradictions or problems in the purpose, configuration, etc. [Explanation of symbols]

[0049] G Gymnasium, IR Infrared laser light, VR Visible laser light, D Light transmission distance, LT Sensor wiring transmission time, RT Response time, ST Light transmission time, 1 Photoelectric separation type sensor, 11 light receiving unit, 111 power supply, 112 transmission circuit, 113 control circuit, 114 memory, 115 light emitting current circuit, 116 light receiver, 117 amplifier, 118 setting device, 12 light transmitting unit, 121 laser driving unit, 122 light transmitter, 13 sensor wiring, 2 wiring, 3 fire receivers, 4 Photoelectric separation type detector, 41 light receiving unit, 411 power supply, 412 transmitting circuit, 413 control circuit, 414 memory, 415 light emitting current circuit, 416 light receiver, 417 amplifier, 42 light transmitting unit, 421 laser driving unit, 422 light transmitter, 423 reply unit, 43 detector wiring, 5 Photoelectric separation type detector, 51 light receiving unit, 511 power supply, 512 transmitting circuit, 513 control circuit, 514 memory, 515 light emitting current circuit, 516 light receiver, 517 amplifier, 518 laser distance meter, 519 angle adjustment housing, 52 light transmitting unit, 521 laser driving unit, 522 light transmitter, 53 detector wiring, 6 Photoelectric separation type sensor, 61 light transmitting and receiving unit, 611 power supply, 612 transmitting circuit, 613 control circuit, 614 memory, 615 light transmitter, 616 light receiver, 617 amplifier, 618 angle adjustment housing, 62 reflector

Claims

1. a light transmitting unit having a light transmitter and a light receiving unit having a light receiver that receives light transmitted by the light transmitter; A photoelectric separation type detector that detects smoke based on the amount of light received by the receiver, A photoelectric separation type sensor characterized by being provided with means for automatically measuring the light transmission distance between said light transmitter and said light receiver optically at the time of installation.

2. 2. The photoelectric separation type sensor according to claim 1, wherein the light emission intensity of said light transmitter is automatically set in accordance with the measured light transmission distance.

3. The light transmitting unit and the light receiving unit are connected by a sensor wiring; 3. The photoelectric separation type sensor according to claim 2, wherein light is transmitted from the light transmitter of the light transmitting section in response to a current supplied from the light receiving section via the sensor wiring.

4. The photoelectric separation type sensor according to claim 3, characterized in that the light transmission distance is measured by measuring the time from when the light is transmitted by the light transmitter of the light transmitting unit to when the light is received by the light receiver of the light receiving unit.

5. a laser rangefinder using visible laser light in either the light transmitting unit or the light receiving unit; 2. The photoelectric separation type sensor according to claim 1, wherein the laser distance meter measures the light transmission distance by irradiating the other of the light transmitting section and the light receiving section with a visible laser beam.

6. a light transmitting / receiving unit including the light transmitter and the light receiver, and a reflector; The light transmitted from the light transmitter is reflected by the reflector and received by the light receiver; 2. The photoelectric separation type sensor according to claim 1, wherein the light transmission distance is measured by measuring the time from when the light is transmitted by the light transmitter until when the light is received by the light receiver.

7. The light emission intensity of the light transmitter can be set in multiple stages, 7. The photoelectric separation type sensor according to claim 1, wherein the light transmitter emits light at a maximum light emission intensity among a plurality of levels when measuring the light transmission distance.

Images