JP2019012007A - Detector - Google Patents

Abstract

To provide a detector capable of being adjusted with a frequency of sound and intermittent sound, without using a tester.SOLUTION: Since intermittent sound depending on a reception signal level is rung within a range from a threshold 2 to a threshold 1 for ringing of a ringer in optical axis adjustment, and after reaching the threshold 1, continuous sound is rung at a frequency of sound depending on the reception signal level, only a frequency of sound adapted to characteristics of the ringer or an audible frequency range of a person who adjusts an optical axis can be used. Also, an optical axis can be adjusted without confirming visual display of, for example, a tester.SELECTED DRAWING: Figure 4

Description

The present invention relates to a detection device including a transmitter and a receiver, and more particularly to a technique for installing and adjusting a transmitter and a receiver so as to face each other.

As this kind of detection device used for the purpose of detecting a conventional intruder, a transmitter having a transmitter for transmitting electromagnetic waves and a receiver having a receiver are opposed to each other with a warning section, and an optical axis There is a type of installation. It detects that the electromagnetic wave emitted from the transmitter is blocked by a person (intruder) passing through the warning section and does not reach the receiver, or that the electromagnetic wave reaching the receiver has decreased, and outputs an alarm signal. is there.

The optical axis in the present invention refers to the central axis of the electromagnetic wave output characteristics of the transmitter and the central axis of the electromagnetic wave input characteristics of the receiver, and is not limited to an optical meaning. In addition, it is said that the optical axes are aligned so that the central axes of these characteristics overlap each other.

Since the transmitter emits electromagnetic waves in the direction of installation of the receiver, the transmitter has directivity in the emission characteristics of the electromagnetic waves. Similarly, since the receiver also receives electromagnetic waves from the direction of installation of the transmitter, it has directivity in the reception characteristics of the electromagnetic waves.

For security purposes, light such as infrared rays and radio waves such as microwaves are used as electromagnetic waves so as not to stimulate human vision.

In order for the detection device to exhibit sufficient performance, the transmission unit and the reception unit must be correctly opposed to each other and adjusted so that the reception signal level is sufficient. If the received signal level is low, malfunctions occur due to the influence of animals such as sunlight, car headlights, shaking trees and cats. The threshold value 1 is provided as a received signal level at which the detection device can discriminate between a signal and noise to such an extent that malfunctions do not occur due to such a cause and can exhibit sufficient performance.

Since the warning distance between the transmitter and the receiver is generally several hundred meters, and the optical axis adjustment at the time of installation or maintenance requires precision, the transmitter and receiver of the conventional detection device The machine is provided with an sight, and the optical axis is adjusted using the sight (see, for example, Patent Document 1). However, since the accuracy of this sighting device cannot be adequately equipped due to the size and cost of the transmitter and the receiver, the received signal level is read as a voltage by the extraction tester, and the optical axis of the receiver is A method of performing fine adjustment was employed. In addition, a method that changes the display of the level meter, LED, etc. according to the received signal level, or a method that informs the received signal level by changing the ringing time or period of the intermittent sound by ringing the ringing device (intermittent sound method) There has been a method (sound frequency method) for notifying a received signal level by changing a sound frequency by sounding a sounding device (see, for example, Patent Document 2).

In the intermittent sound method and the sound frequency method, the sounding device is sounded according to the received signal level when adjusting the optical axis, but if the received signal level is lower than the preset threshold value 2, the sounding device is not activated and the threshold value 2 is reached. After that, an intermittent tone and a continuous tone are sounded.

In order to improve the optical axis adjustment efficiency of the transmitter, wireless communication is performed with the receiver. When adjusting the optical axis of either the transmitter or the receiver, the received signal level can be confirmed, There was a device that could change the receiver settings or the transmitter settings on the receiver side. (For example, refer to Patent Document 3).

Japanese Patent No. 5568820 Utility Model Registration No. 2531524 Japanese Patent No. 5286608

The received signal level is attenuated by rain or snow, dirt on the cover of the transmitter or receiver, etc., so even if it attenuates due to such a cause, it will be received even after reaching the threshold value 1 so as not to output an alarm signal by mistake. There are cases where it is required to increase the signal level, or there are cases where it is required to match the highest level in the installation environment.

As a method for increasing the received signal level, there are a method of performing visual display such as a tester and a method of informing by sounding a sounding device. Accurate adjustment can be performed by reading a visual display such as a tester. However, when the optical axis is adjusted, if the line of sight is not directed toward the optical axis adjustment device, the optical axis adjustment device may be operated in the reverse direction due to the error of the adjuster or may be excessively adjusted. In such a case, move the line of sight from the tester to the sighting device to adjust the optical axis, but moving the line of sight requires labor, so adjust the optical axis while checking the sighting device, or adjust the optical axis. Ideally, the optical axis adjustment device should be operated while visually observing the device, or adjustment should be performed so that there is no error in the operation of the optical axis adjustment device.

In order to adjust the optical axis, it is necessary to operate the optical axis adjustment mechanism by turning the screw with a screwdriver or turning the knob or dial with a finger. Are less prone to errors in operation.

On the other hand, in the method of notifying the reception signal level by ringing the ringing device, it is not necessary to move the line of sight from the sighting device or the optical axis adjustment device, so the sighting device or the optical axis adjustment device is used while checking the reception signal level. be able to. For these reasons, in adjusting the optical axis of the detection device, a method of notifying a received signal level by sound rather than visual display is effective.

FIG. 2 shows the relationship between the received signal level of the conventional intermittent sound system and the intermittent sound period. In the intermittent sound system, the received signal level is gradually increased by adjusting the optical axis, and the ringing device is not sounded until the threshold value 2 is reached. Reduce the ring time gradually. By switching to continuous sound after reaching the threshold value 1, it has been found that the reception signal level at which the detection device can exhibit sufficient performance has been reached. However, in the intermittent sound method, after switching to continuous sound, the same sound continues to sound even if the received signal level rises, so it is necessary to read the display of a tester etc. in order to increase the accuracy of the optical axis, With sound, the received signal level is unknown.

FIG. 3 shows the relationship between the received signal level of the conventional sound frequency method and the sound frequency method. In the sound frequency method, the ringing device does not ring until the received signal level reaches the threshold value 2, but when the threshold value 2 is reached, the sound having the lowest sound frequency is sounded. The frequency of the sound is changed according to the change. In this method, the received signal level can be adjusted to the maximum by adjusting the optical axis in the direction where the sound is highest. However, since it is impossible to determine whether or not the threshold value 1 has been reached in the sound frequency method, the received signal level is increased more than necessary, and adjustment may take time, or whether the line of sight has reached the threshold value 1 It is confirmed that the received signal level has reached the threshold value 1 by moving to an indicator lamp for indicating whether or not, or to a tester.

A piezoelectric buzzer is used as a sounding device for sounding the continuous sound and the intermittent sound for cost reasons. Since the sound pressure of the piezoelectric buzzer varies depending on the frequency of sound, it is necessary to limit the frequency of sound to a narrower band (band where the piezoelectric buzzer can sound a sufficient sound pressure) within the audible range. For example, in the case of the sound frequency method, if the range in which the received signal level changes is constant and the range to which the frequency band is assigned is narrowed, it is difficult to determine the received signal level by listening to the sound frequency.

In addition, elderly people and the like have a narrow audible frequency band. Therefore, unless the frequency band in which the piezoelectric buzzer is sounded is narrowed, the sound may not be heard due to a change in frequency.

Therefore, there is a need for a method that can easily complete the adjustment of the received signal level using a sighting device or visually observing the optical axis adjusting device using a narrow sound frequency range.

The ringing device does not ring until the received signal level reaches the threshold value 2, and the intermittent sound is generated from the threshold value 2 by the intermittent sound method, and the period and time of the intermittent sound are changed according to the received signal level. The ringing device is sounded by the intermittent sound method until the received signal level exceeds the threshold value 1, and after the threshold value 1, the continuous sound is sounded by the sound frequency method, and the frequency of the continuous sound according to the received signal level. To change the sound of the sounding device.

Moreover, it is preferable that the frequency of the intermittent sound and the continuous sound when the received signal level is switched at the threshold value 1 be the same.

In addition, it is preferable to change the frequency or tone color of the sound during a single ringing tone.

The present invention provides a range of received signal levels that use a sound frequency system (for example, for example) when the received signal level is in the same range as the conventional received signal level (for example, 1 to 5 volts in terms of voltage). (3 to 5 volts in terms of voltage) is narrowed, and the sound frequency band required when the frequency change amount of the sound per received signal level change amount is the same as in the conventional case is narrowed. Eliminates the need to use sounds with frequencies outside or near the audible frequency band of narrow people. For this reason, even a person with a narrow audible frequency band such as an elderly person can easily adjust.

In addition, since the piezoelectric buzzer can be used only in the sound frequency band where sufficient sound pressure can be generated, sufficient sound pressure can be obtained over the entire frequency band of the sound used in the sound frequency system part. As a result, it is possible to make a sound, and it is easy for a person in a general audible frequency band to listen.

Until the received signal level reaches the threshold value 1 from the threshold value 2, the threshold frequency 1 is reached by changing the interval and the length of the ringing sound without changing the sound frequency by using the intermittent sound method. Even if the frequency band of the sound used for ringing is narrowed in the frequency method part of the sound after the sound, the amount of frequency change per received signal level change amount equivalent to the conventional sound frequency method can be secured, and the light The degree of difficulty of axis adjustment can be made equal.

In the conventional intermittent sound method, after reaching the threshold value 1, it is necessary to make adjustment while confirming the tester, but according to the present invention, it is not necessary to use a device that visually displays the received signal level. Therefore, the optical axis can be adjusted by directing the line of sight to the sighting device or the optical axis adjustment device, so that errors in the operation of the optical axis adjustment device can be reduced. Adjustment is easy.

It is the functional block diagram which showed the Example of the detection apparatus by this invention. It is the figure which showed the relationship between the received signal level and ringing state at the time of adjusting the received signal level of a detection apparatus by the intermittent sound by the conventional intermittent sound system. It is the figure which showed the relationship between the received signal level at the time of adjusting the received signal level of a detection apparatus by the frequency change of the sound of a continuous sound by the conventional continuous sound system, and a ringing state. It is the figure which showed the relationship between the received signal level and ringing state at the time of adjusting the received signal level of a detection apparatus by the frequency change of the sound of an intermittent sound and a continuous sound of this invention.

Hereinafter, although an embodiment of the present invention is described, the present invention is not limited by the following description. In the following, an example in which the sighting device and the ringing device are integrated with the opposed detection device will be described as an example, but it may be removed at the time of warning and attached only at the time of optical axis adjustment. Also, the transmitter is equipped with a ringing device, each of the transmitter and the receiver has a communication function, communicates between the receiver and the transmitter, and sends the received signal level to the transmitter. You may make it ring according to a received signal level with a ringing device.

In the following embodiments, the transmitter and the receiver are separated from each other. However, the transmitter and the receiver integrated (transceiver) are also included in the scope of the invention. This is a detection device in which a transmitter / receiver and a reflection device (such as a retroreflector that reflects electromagnetic waves in the direction in which an electromagnetic wave is received) are opposed to each other with a warning section and the optical axes are aligned. The electromagnetic wave emitted from the transmitter is blocked, the electromagnetic wave does not reach the receiver of the transmitter / receiver, the reflection device and the transmitter / receiver are blocked, the increase or decrease of the reaching electromagnetic wave, and the phase change are detected. The alarm signal is output.

The present invention constitutes a detection device as shown in FIG. The electromagnetic wave 11 is emitted from the transmission unit 12 of the transmitter 10 and received by the reception unit 25 of the receiver 20. The reception unit 25 performs signal processing and converts the received signal level 22. The reception signal level 22 is input to the reception signal level processing / determination unit 26, and if the reception signal level 22 does not satisfy the threshold value 2, the detection signal 23 is input to the alarm output unit 27. If the detection device is in the optical axis adjustment state, the ringing signal 24 is input to the ringing device 28. When the detection signal 23 is input to the alarm output unit 27, the alarm output unit 27 inputs the alarm signal 21 to an alarm receiver (not shown). Alarm receivers are installed in security centers and building manager rooms, and are monitored by people who reside there.

When the cover of the detection device is opened, a switch for switching the operation state of the detection device is activated, and the optical axis adjustment state is changed from the alert state. The ringing signal 24 is not output when the detection device is in a warning state or when the sound ON / OFF switch is OFF even in the optical axis adjustment state. When the detection device is in the optical axis adjustment state and the sound ON / OFF switch is ON and the reception signal level 22 is greater than or equal to the threshold 2, the ringing signal 24 is output. 22 changes. FIG. 4 shows the relationship between the intermittent sound period, the sound frequency, and the received signal level 22 at this time.

In the optical axis adjustment, in the unadjusted state, the received signal level 22 becomes smaller than the threshold value 2 and becomes silent. Therefore, using the sighting device 13 and the sighting device 29 provided in the transmitter and the receiver, respectively, the emission direction of the electromagnetic wave And the optical axis is adjusted by operating the optical axis adjusting device 14 and the optical axis adjusting device 2A in the receiving direction. Each optical axis adjusting device is configured to be operated with a finger if it is a knob or dial, and using a screwdriver if it is a screw type.

When the rough adjustment is performed and the reception signal level 22 reaches the threshold value 2, the reception signal level processing / determination unit 26 inputs the intermittent sound signal as the ringing signal 24, and the ringing device 28 rings the intermittent sound. As the reception signal level 22 increases, the reception signal level processing / determination unit 26 inputs the ringing signal 24 to the ringing device 28 so as to shorten the intermittent sound ringing time and ringing stop time. An intermittent sound is generated according to the signal 24. As a result, the adjuster can listen to the received signal level 22 separately, so the optical axis is adjusted while using the sight while listening to the sound or visually observing the optical axis adjustment device.

When fine adjustment is further performed and the reception signal level 22 reaches the threshold value 1, the reception signal level processing / determination unit 26 switches the ringing signal 24 from an intermittent tone to a continuous tone and inputs it to the ringing device. The fact that the continuous sound has sounded means that the received signal level 22 has reached the threshold value 1, and the detection device can discriminate between noise and signal, and the adjustment may be completed.

Since the sound frequency method associates the sound frequency with the received signal level, the frequency of the intermittent sound and the sound of the continuous sound when the received signal level 22 is the threshold 1 and the intermittent sound method and the sound frequency method are switched. If they are separated from each other, they may sound in the same manner as when the received signal level 22 changes greatly. Then, the adjuster may feel as if there was an error in adjusting the optical axis. Therefore, as shown in FIG. 4, the misinterpretation can be avoided by operating so that the frequency of the intermittent sound around the threshold value 1 and the frequency of the continuous sound match.

Even after the reception signal level 22 reaches the threshold 1, the frequency of the continuous sound increases as the reception signal level 22 increases. Since the received signal level 22 can be confirmed by listening to the change in the frequency of the sound, the optical axis is adjusted while using the sight or visually observing the optical axis adjusting device.

At this time, since the adjustment state of the reception signal level 22 becomes clearer by changing the sound pressure in accordance with the sound frequency, the sound pressure is increased so that the sound pressure increases as the sound frequency increases.

The received signal level 22 can be adjusted to the maximum value in the installation environment of the detector by adjusting the optical axis so that the sound frequency or sound pressure is highest. However, even if the same device is used, the maximum value of the received signal level 22 varies depending on the installation environment, the distance between the transmitter and the receiver, and the like.

In the above embodiment, the frequency and tone color of the sound when the intermittent sound is sounded are not changed, but the frequency of the sound may be changed to a sweep sound or the like. A sweep sound is a sound whose frequency and tone change during a single ring. By including the frequency of the sound whose sound pressure increases due to the buzzer characteristics in the sweep frequency range of the sweep sound, it is easy for people with normal audible frequency bands to hear, and even those with narrow audible frequency bands such as elderly people can listen Inclusion of easy-to-take sound frequencies makes it easier for more people to listen.

As the sound signal to be sounded, various signals such as a sine wave, a rectangular wave, or a combination thereof can be used. In particular, in the case of a rectangular wave, the timbre can be changed by changing the duty ratio with a constant period.

In the above embodiment, in FIG. 4, the period of intermittent sound and the frequency of sound are linearly changed according to the received signal level, but the period and sound frequency are changed nonlinearly (for example, logarithmically). May be.

Although the embodiment of the present invention has been described above, the above-described embodiment is presented as an example, and the scope of the invention is not limited to this, and can be implemented in various other forms. It is included in the scope of the invention described in the scope of claims and its equivalent scope.

DESCRIPTION OF SYMBOLS 10 Transmitter 11 Electromagnetic wave 12 Transmitter 13 Aiming device 14 Optical axis adjustment device 20 Receiver 21 Alarm signal 22 Received signal level 23 Detection signal 24 Ring signal 25 Receiver 26 Received signal level processing / determination unit 27 Alarm output unit 28 Ringer 29 Aiming device 2A Optical axis adjustment device

Claims (7)

In a detection apparatus constituted by a transmitter having a transmitter for transmitting electromagnetic waves and a receiver having a receiver for receiving electromagnetic waves emitted from the transmitter,
The transmitter or receiver includes a ringing device that performs ringing according to the received signal level received from the electromagnetic wave emitted from the transmitter,
The sounding device sounds either an intermittent sound or a continuous sound,
The continuous sound changes the frequency of the sound according to the received signal level,
Depending on the received signal level, the intermittent sound changes in ringing interval and / or length of ringing,
A detection apparatus, wherein the intermittent sound and the continuous sound are switched at a preset threshold value 1 of the reception signal level.   The detection device according to claim 1, wherein the electromagnetic wave is a radio wave.   The detection device according to claim 1, wherein the electromagnetic wave is a light beam.   4. The detection device according to claim 1, wherein the threshold value 1 is a received signal level that does not require adjustment of an optical axis of the detection device.   4. The detection device according to claim 1, wherein the continuous sound has a sound pressure that changes in conjunction with a change in sound frequency.   4. The detection device according to claim 1, wherein the frequency of the intermittent sound and the frequency of the continuous sound are the same before and after the threshold value 1.   4. The detection device according to claim 1, wherein the intermittent sound is accompanied by a change in sound frequency or tone color during one ringing.

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