JPH0398333A - Reception angle adjusting equipment for space transmission signal in fire alarm installation - Google Patents

Abstract

PURPOSE:To easily adjust the reception angle of a space transmission signal with the adjustment of an adjustment screw by fitting a signal reception means to a reception angle adjustment plate supported movably by a main body part with the adjustment screw. CONSTITUTION:A signal reception means 22a is fitted to a reception angle adjustment plate 24 whose one terminal is fitted to a main body 20a and whose other terminal is supported by the main body movably with an adjustment screw 26. For example, an optical reception section 22a of a photodetector is fitted to a fitting jig, that is, a reception light angle adjustment plate 24 so as to receive the light made incident through a light receiving window 20b formed to the main body part 20a and one terminal of the fitting jig 24 is fixed to the main body part 20a. A threaded opening is formed near the other terminal of the fitting jig 24 and the light receiving angle is adjusted by the adjustment screw 26. Thus, the reception angle of directivity space propagation medium such as a light is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 4] The present invention relates to a receiving angle adjusting device for spatially transmitted signals in fire alarm equipment.

[Background of the Invention] For example, Japanese Patent Application No. 1-163670 filed by the applicant on June 29, 1999 under the name "Optical Wireless Fire Alarm Equipment" and month 11
Japanese Patent Application No. 1-177098, filed in 1998, discloses a fire detector equipped with a fire detector for detecting fire, and a receiver such as a controller that receives signals from the fire detector and makes various decisions. In order to omit signal wiring from the fire detector to the fire detector, the signal transmission between the two is performed by spatial transmission of light or the like. In this case, a built-in battery is often used as the power source for the fire detector.

These patent applications also state that when installing a receiving unit such as a fire detector or controller in a device that performs spatial transmission in this way, it is necessary to ensure that signals can be sent and received between the two after installation. , describes a so-called installation test in which a fire detector sends an installation test signal as an optical signal to a receiving unit to adjust light reception.

[Problems to be Solved by the Invention] Although the present invention is not intended to be limited thereto, the present invention is particularly applicable to fire alarms in which signal transmission is performed by spatially transmitted signals such as light, as in the above-mentioned patent application. It is an object of the present invention to provide a receiving angle adjustment device for spatially transmitted signals in fire alarm equipment, which is suitable for performing the above-mentioned installation test.

Generally, in spatial transmission systems, such as optical transmission systems,
In order to satisfy the contradictory requirements of increasing the transmission distance while maintaining transmission reliability and reducing power consumption on the transmitting side, the transmitting source pulse narrows the optical axis and has forward directivity (e.g. , left and right angles of 10° to 30°). Therefore, when installing a fire detector and a receiver (controller) as in the above-mentioned patent application, an installation test is conducted to ensure that the light between the light transmitting part in the fire detector and the light receiving part in the receiver is Axis alignment must be performed and adjustments must be made to ensure proper signal transmission.

Therefore, the object of the present invention is to provide a system suitable for conducting installation tests in fire alarm equipment that transmits signals using space transmission signals such as light, for example, as in the above-mentioned patent application. It is an object of the present invention to provide a device suitable for adjusting the reception angle of a directional spatial propagation medium such as light.

[Means for solving problems] Books. According to the invention, the fire detection section (10) and the reception section (2
0), wherein each of the fire detection section and the reception section has a signal sending means and a signal reception means for transmitting and receiving a space transmission signal, wherein the fire detection section and the reception section In order to adjust the receiving angle of the spatial transmission signal sent from one signal sending means to the other signal receiving means, the signal receiving means (22'a) in the fire detection section and/or the receiving section;
One end is fixed to the main body (20a), and the other end is an adjustment screw.
26) provides a reception angle adjustment device for airborne transmission signals in fire alarm equipment, which is attached to a reception angle adjustment plate (24) movably supported by the main body.

[Function 1] Since the signal receiving means (22a) is attached to the reception angle adjustment plate (24) movably supported by the main body (20a) by the adjustment screw (26), the reception angle of the spatially transmitted signal can be adjusted. , can be easily done by adjusting the adjustment screw.

[Example] Hereinafter, as an example, a case will be described in which the present invention is applied to the above-mentioned patent application, taking light in the infrared region as an example of the directional spatial propagation medium.

FIG. 1 is a diagram schematically showing the configuration of the optical wireless fire alarm system in the above-mentioned patent application. an optical transmitting/receiving section 12 consisting of a receiving section;
In addition, a switch SW is shown to be operated when performing an installation test. When the switch SW is operated, an installation test signal is sent out from the optical transmission section of the optical transceiver section 12.

4 The receiving unit 20 also includes an optical receiving part for receiving optical signals from the fire detector 10, and an optical receiving part for receiving the optical signal from the fire detector 10. An optical transmitting/receiving unit 22 consisting of an optical transmitting part for transmitting a test signal and six indicator lights L1 for displaying the results of discrimination processing based on the received signal from the fire detector 10.
-L6, and an installation test switch SW2 that is operated when performing an installation test are shown provided.

The optical signal sent from the fire detector 10 is, for example, sent when a fire is determined based on heat, smoke, etc. from the fire phenomenon detection means ε provided inside the fire detector 10. fire signal, abnormal signal indicating an abnormality such as a sensor falling off, voltage drop abnormal signal indicating a voltage drop abnormality, etc., normal signal sent periodically to detect optical path interruption, A good test result signal is sent out when a signal is detected, and an installation test signal is sent out to align light reception during an installation test.

Further, as an example, the six indicator lights 1 to L6 are the fire indicator lights L, which are lit when the light information sent from the fire detector 10 is a signal indicating the occurrence of a fire, and the receiving unit 20. Accumulation indicator light L2 that lights up when the battery is performing an accumulation operation to monitor the occurrence of a fire, test indicator light L3 that lights up when the operation test result of the fire detector 10 is good, and the fire detector an optical path interruption indicator light that lights up when it is determined that the optical path between the fire detector 10 and the receiver 20 is interrupted, and a battery replacement indicator light L that indicates that the built-in battery of the fire detector 10 has reached the end of its life. A sensor abnormality indicator light L6 is set to indicate that some abnormality has occurred in the fire sensor 10, such as the fire sensor 10 falling off.

The receiving unit 20 may notify or notify the monitoring panel of the received contents and judgment results from the fire detector 10 by telephone transmission via a telephone transmission terminal and a telephone line such as an extension, as necessary. Alternatively, notification can be made by wire or wirelessly to a fire receiver or the like at a disaster prevention center.

When performing an installation test of the fire detector 10 and the receiving section 20 shown in FIG. 1 as an example for explaining the present invention, that is, when adjusting the light reception level between the
Fire detector 10 is activated by operating switch SW1 of
An installation test signal is sent from the light transmission part, which may be a light emitting diode, of the optical transmitter/receiver 12 of the fire detector 10, and by operating the installation test switch SW2 of the receiver 20, the installation test signal is transmitted from the fire detector 10. Based on this, the optical axes are aligned so that the amount of light received between the two is maximized.

First, on the transmitting side, that is, on the fire detector side, when installed, the fire detector 10 is rotated left and right to align the optical axis by directing the optical transmitter/receiver 12 toward the receiver 20.

The receiving unit 20 should generally be mounted on a wall,
Depending on the installation environment, it may not always be possible to install it in front of the fire detector 10. Therefore, in the present invention, the optical receiving portion of the optical transmitting/receiving section 22 of the receiving section 20, which may be a light receiving element such as a photodiode, is provided with a An optical axis adjustment mechanism as shown in FIG. 2 is provided which allows adjustment by about 30 degrees.

In the optical axis adjustment mechanism of the receiving section 20 shown in FIG. 2, the optical receiving section 22a of the optical transmitting/receiving section 22 passes through the light receiving window 20b formed in the main body section 20a inside the main body section 20a of the receiving section 20. In order to receive the incident light,
It is shown attached to a fixture, that is, a light receiving angle adjusting plate 24, and one end of the fixture 24 is fixed to the main body portion 20a.

A threaded opening is formed near the other end of the fixture 24 into which an adjustment screw 26 is threaded. One end of the adjustment screw 26 is supported within a hole in an L-shaped fitting 28 attached to the body portion 20a so that the adjustment screw 26 can rotate about an axis. The other end, that is, the head of the adjustment screw 26 has a small hole 20 formed in the main body portion 20a.
It can be accessed from the outside via the light receiving element 22a, and thereby the light receiving angle of the light receiving element or the light receiving portion 22a can be adjusted by rotating the adjusting screw 26 from the outside with a driver or the like.

8 In this manner, when performing an installation test, two movable objects must be adjusted: the angle adjustment of the light receiving part 22a in the receiving unit 20, and the direction adjustment or attachment adjustment of the light transmitting part of the fire detector 10. These adjustments must be made at the same time, and it is extremely difficult to perform such optical axis adjustment just by visual inspection. Therefore, in this embodiment, a reception level adjustment device suitable for performing such optical axis adjustment is provided.

FIG. 3 shows a block circuit configuration including a reception level adjusting device according to an embodiment of the present invention, which is provided in the receiving section 20 as an example.
SL is a microprocessor, and SL is a microprocessor M by operating the installation test switch SW2 shown in FIG.
A signal selection circuit that selects a signal to be given to the PU, S
W. ．． and SWolJ is the installation test switch SW 2
The input switching circuit and the output switching circuit are switched according to the commands of the microprocessor MPU depending on whether the Analog-digital (A/D) conversion circuit, DP is output switching circuit SW
A light emitting diode (LED) display control unit connected to the output side of the ou. Note that the input switching circuit SW. ．． On the input side of the light receiving part, that is, the light receiving element 2 shown in FIG.
2a is connected, and the light emitting diode display control unit DP
There are six indicator lights shown in Figure 1 on the output side of ~L6.
are shown connected.

In the above configuration, during normal fire monitoring operation, the installation test switch SW2 is not operated and is open, and if the installation test switch SW2 is open, the signal selection circuit SL is input to the terminal T8. A signal is given to the microprocessor MPU.

In addition, the input switching circuit SW! A and output switching circuit SWoυ
Each of these movable contacts is a fixed contact ■. and is placed in the OA position.

When some signal is input to the light receiving element 22a from the fire detector 10 in this state, the input signal is sent to the input switching circuit S.
W,. After receiving light/signal processing at the light receiving/signal processing circuit PR through the fixed contact ■8, the microprocessor MP
It is given to U and the determination is made there. As a result of the determination, fire occurred, accumulation occurred, test result was good, light path was blocked, battery was replaced,
When it is determined that a state such as a sensor abnormality has occurred, six indicator lights L, ~ One or several of L6 are lit.

Next, when performing an installation test, first, the installation test switch SW2 is operated and closed, and the contact close signal is given to the signal selection circuit SL. When the contact close signal from the installation test switch SW2 is given, the signal selection circuit SL selects the terminal ■. Instead of the signals input to the terminals SW, . . . , the signals input to the terminals SW, . Then, move the movable contacts of the output changeover switch SWoU toward the fixed contacts 8 and OB, respectively. Along with this, the indicator lights L1 to L6 function as level meters of the light reception level or light reception intensity of the installation test 11 signal received by the light receiving element 22a, as will be described in detail below.

Thereafter, when the switch SW1 of the fire detector 10 is operated, an installation test signal is sent out from the optical transmitter/receiver 12 of the fire detector 10, and is received by the light receiving element 22a of the receiver 20. The installation test signal received by the light receiving element 22a is
Input switching circuit SW, . Fixed contact I. via amplifier AM
After being amplified by the A/D conversion circuit CV, the converted signal is converted into a digital signal according to the received light level or the received light intensity, and then the converted signal is sent to the terminal I7 and the signal selection circuit SL.
to the microprocessor MPU.

In the microprocessor MPU, with respect to the light reception level or light reception intensity of the installation test signal received by the light receiving element 22a, from the first level range representing the lowest light reception intensity,
Six level ranges are set up to the sixth level range representing the highest received light intensity.

As a result, when a digital conversion signal representing the received light level or the received light l2 intensity is given to the microprocessor MPU via the signal selection circuit SL, the microprocessor MPU determines whether the given digital conversion signal is The level range signal representing the determined range is sent to L'E via the fixed contact 08 of the output switching circuit SWoU.
'D is given to the display control unit DP.

When the level range signal corresponding to the received light intensity given from the microprocessor MPU indicates the first level range, the LED display control unit DP lights only the indicator light L1 and displays the second level. When the level range is indicated, both indicator lights L1 and L2 are lit, and when the level range is indicated, the three indicator lights L1 to L are lit, If the fourth level range is indicated, the indicator light L. - L, are turned on, and when the fifth level range is indicated, five indicator lights L1 to L5 are lit, and when the sixth level range is indicated, the five indicator lights L1 to L5 are lit. There are six indicator lights L. ~L
Turn on all 6.

In this case, as the optical axis alignment between the fire detector 10 and the receiving section 20 progresses, the intensity of light received at the receiving section 20 increases, and the number of indicator lights lit increases. Therefore, the operator conducting the installation test rotates the adjustment screw 26 of the optical axis adjustment mechanism shown in FIG.
2a is adjusted, and then the direction of the fire detector 10 is similarly adjusted to the point where the reception intensity is maximum. The installation test for optical axis alignment is completed when the maximum number of lights is lit.

Note that in order to complete the installation test, it may be determined that at least four indicator lights must be lit, for example. If the number does not reach four, the operator can know that the transmission distance is too long or the direction adjustment is poor, and that the adjustment should be made again. Furthermore, the operator
If the number does not reach 4, the intensity of the installation test signal emitted from the fire detector 10 is lower than the specified amount, or the light receiving element 22a or the light receiving level adjustment device shown in FIG. 3 is malfunctioning. It is also possible to consider the case where there is some kind of abnormality on the adjusting device side.

[Effects of the Invention'] As described above, according to the present invention, in a fire alarm system that transmits and receives space transmission signals between a fire detection section and a reception section, the signal receiving means such as a light receiving element can be moved by an adjustment screw. Since it is attached to the reception angle adjustment plate supported by the main body part, the reception angle of the spatially transmitted signal can be easily adjusted during an installation test by adjusting the adjustment screw.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an example of fire alarm equipment to which the present invention is applied, FIG. 2 is a cross-sectional configuration diagram showing an optical axis adjustment mechanism according to an embodiment of the present invention, and FIG. 3 1 is a block circuit diagram showing a reception level adjustment device that can be used when implementing the present invention. In the figure, 10 is a fire detector (fire detection part), 15 and 12 are optical transmitting and receiving parts, 20 is a receiving part, 20a is a main body part,
20b is a light receiving window, 20c is a small hole for adjusting the adjustment screw, 22
22a is an optical transmitting/receiving section; 22a is an optical receiving section; signal receiving means;
24 is a fitting (reception angle adjustment plate), 26 is an adjustment screw. 16

Claims (1)

[Scope of Claims] Fire alarm equipment comprising a fire detection section and a reception section, each of which has a signal transmission means and a signal reception means for transmitting and receiving a space transmission signal. In order to adjust the receiving angle of the space transmission signal sent from the signal sending means of one of the fire detecting section and the receiving section to the signal receiving means of the other, A receiving angle adjusting device for a spatially transmitted signal in a fire alarm system, wherein a signal receiving means is attached to a receiving angle adjusting plate having one end fixed to a main body and the other end movably supported by the main body by an adjustment screw.