JPH042896B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a light beam detector used for monitoring theft and fire, and particularly to a light beam detector for adjusting the optical axis between a separately arranged projector and receiver. The present invention relates to an optical axis adjustment device for a light beam detector.

[Prior Art] Conventionally, in the case of this type of light beam blocking type detector, for example, a light beam type detector for theft monitoring, a light emitter and a light receiver are separately installed facing each other in a security area where theft monitoring is performed. Later, the optical axes of the emitter and receiver are adjusted.

This optical axis adjustment can be done by first assuming that the emitter 1 and receiver 2 are installed as shown in Figure 3a.For example, the receiver 2 is attached to the pole 3 as shown in the exploded view of Figure 4. Fix with bolt 4 and attach mounting plate 5.
Since the main body 6 is attached to the main body 6, with the cover 7 of the main body 6 removed, set the sight 8 on the top of the main body 6 as shown in FIG. Then, roughly adjust the optical axis by operating the detection unit 9 up and down or left and right. Perform this work in the same way on the projector side.

Subsequently, as shown in FIG. 3b, a level meter 10 is connected to the monitor terminal of the light receiver 2, and the optical axis is adjusted while checking the monitor output using the level meter 10.

Furthermore, if good results cannot be obtained even after adjusting the optical axis using a level meter, the cause is that the optical axis of the projector is misaligned, so as shown in Figure 3c, An adjuster is attached to both the receiver 1 and the receiver 2, and the adjuster on the receiver 2 side looks at the level meter 10 and instructs the adjuster on the emitter 1 side by looking at the point with the largest level fluctuation or using a transceiver, etc. and adjust the optical axis of the projector.

Of course, if there is only one adjuster, he will go back and forth between the light receiver 2 and the projector 1 to adjust the optical axis.

[Problems to be Solved by the Invention] However, in such conventional optical axis adjustment, when adjusting the optical axis on the emitter side, the monitor output of the receiver must be adjusted from the receiver side using a gesture or a transceiver. Because the projector had to adjust the optical axis by communicating the status of the projector, it took time to adjust the optical axis on the projector side, and sufficient communication was difficult, making it impossible to align the optical axis accurately. I have a problem that requires it.

The present invention has been made in view of these conventional problems, and an object of the present invention is to provide an optical axis adjustment device for a light beam detector that allows accurate and easy adjustment of the optical axis on the projector side. do.

[Means for Solving the Problems] In order to achieve this object, the present invention converts the monitor output from the light receiver into a frequency signal (V
-F conversion), the converted frequency signal is sent to the projector as a wireless signal such as an optical signal or a radio signal, and the projector receives the transmitted signal from the projector and produces a visual output (level display,
(LED display) and/or an audible output (acoustic output of frequency signals).

[Function] In the optical axis adjustment device of the present invention having such a configuration, the state of the monitor output of the light receiver can be quickly and accurately obtained on the emitter side, and the monitor output of the light receiver side can be obtained quickly and accurately. The optical axis of the projector can be adjusted quickly and accurately in the same condition as when viewing directly.

[Embodiment] FIG. 1 is a block diagram showing an embodiment of the present invention, taking a light beam detector for theft monitoring as an example.

In Fig. 1, 1 is a floodlight, which turns on light emitting elements such as LEDs by oscillating output at a predetermined frequency.
It is turned off and emits an infrared pulse beam towards the restricted area. Reference numeral 2 denotes a light receiver, which is placed separately in a position opposite to the floodlight 1, and detects interruption of the infrared pulse beam emitted from the floodlight 1 by an intruder, etc., and displays an alarm on a monitoring panel installed in a control room, etc. have them do it. This light receiver 2 is usually provided with a monitor terminal for adjusting the optical axis.

In the present invention, for such a light beam detector instead of a light emitter 1 and a light receiver 2, the monitor output from the light receiver 2 is first inputted to the light receiver 2 side to correspond to the signal level of the monitor signal. A V/F converter 11 is provided as a frequency converter for converting into a frequency signal,
The frequency signal output of the V/F converter 11 is transmitted to the projector 12.
The frequency signal is used to control on/off of light emitting elements such as LEDs provided in the light projector 12, and the frequency signal is converted into an optical signal and transmitted to the light projector 1 side.

On the other hand, the light emitter 1 side is provided with a light receiver 13 that receives an optical signal from the light emitter 12 for optical axis adjustment provided on the light receiver 2 side, and the frequency signal received by the light receiver 13 is amplified by an amplifier 14. and drives the speaker 15 with the frequency signal from the amplifier 14,
The monitor output of the light receiver 2 can be transmitted acoustically.

Next, to explain the optical axis adjustment according to the embodiment shown in Fig. 1, first, the emitter 1 and the receiver 2 are installed separately, and then the sight is used as in the conventional case shown in Figs. 3a and 5. First, perform a rough optical axis adjustment.
Next, the emitter 1 and the receiver 2 are brought into operation, and the optical axis adjustment device is set to the emitter 1 and the receiver 2 as shown in the figure.
A V/F converter 11 is input connected to the monitor terminal of the light receiver 2. The V/F converter 11 outputs a frequency signal corresponding to the output level of the monitor output of the light receiver 2 obtained as a voltage signal. That is, a frequency signal proportional to an increase in the monitor output level is output. The frequency signal from the V/F converter 11 is converted into an optical signal by the light projector 12 and transmitted to the light receiver 13 installed on the light projector 1 side. The optical receiver 13 converts the received optical signal into an electrical signal, that is, a frequency signal, and the frequency signal from the optical receiver 13 is amplified by the amplifier 14, which drives the speaker 15 to produce an acoustic output. That is, since the frequency signal received when the monitor output of the light receiver 2 is small is at a low frequency, the acoustic output of the speaker 15 is heard as a low tone, and if the optical axis of the projector 1 is adjusted in this state,
If the monitor output increases, the frequency of the received frequency signal will increase, and the acoustic output from the speaker 15 will change to a higher sound, thereby immediately indicating that the projector 1 is being adjusted to the side where the optical axis is aligned. You can know.

FIG. 2 is a block diagram showing another embodiment of the present invention on the emitter 1 side, and in this embodiment, as shown in FIG.
In contrast to the F converter 11 and the emitter 12, the emitter 1 side includes a receiver 13, an amplifier 14, an F/V converter 16 in place of the speaker 15 in FIG. 1, an output display section with a level meter 17, and an LED display. vessel 18
It is characterized by being provided with an output display section.

That is, in the embodiment shown in FIG.
After the received light frequency signal is amplified by the amplifier 14, the received frequency signal is converted to a corresponding voltage signal by the F/V converter 16, and the level meter 17 allows the monitor output to be directly displayed on the meter. Further, the frequency signal from the amplifier 14 is applied to the LED display 18, so that the status of the monitor output can be visually judged by the blinking speed of the LED display 18.

Incidentally, in the embodiment shown in FIG. 2, both the level meter 17 and the LED display 18 are provided.
Of course, it may be either one of them.
In addition, the speaker 15 shown in FIG. 1 provides an auditory output and the level meter 17 shown in FIG.
Of course, it may also be combined with visual output from the LED display 18.

Furthermore, in the above embodiment, the frequency-converted monitor output is transmitted from the light receiver side to the light emitter side as an optical signal, but a transmitter is provided in place of the light emitter 12, and a transmitter is provided in place of the light receiver 13. A receiver may be provided in the receiver, and a monitor signal frequency-converted by a radio wave signal may be transmitted from the receiver to the projector.

Of course, the above-mentioned optical axis adjustment devices on the receiver side and the emitter side are made as portable and portable units, and are used by being set in the emitter and the light receiver when adjusting the optical axis. Furthermore, although the above embodiment describes a light beam detector for monitoring theft, the present invention can be similarly used in a light beam detector for monitoring fires based on changes in the amount of light received due to the intrusion of smoke.

[Effects of the Invention] As described above, according to the present invention, the monitor output of the light receiver is frequency-converted and transmitted to the emitter side for visual or auditory output, which makes installation work easier. The optical axis on the emitter side can be adjusted easily and accurately, and by accurately aligning the optical axis, the receiver side can receive a sufficient amount of infrared pulsed beam, which prevents false alarms even under adverse conditions such as fog. will not occur.

Furthermore, even with only one adjuster, the state of the monitor output of the light receiver can be accurately grasped on the projector side, and the optical axis adjustment on the projector side can be easily and accurately performed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention; FIG. 2 is a block diagram showing another embodiment of the present invention; FIG. 3 is an explanatory diagram showing conventional optical axis adjustment;
FIG. 4 is an exploded view of a conventional optical receiver; FIG. 5 is an explanatory diagram showing an optical axis adjustment operation on the conventional optical receiver side using a sight. 1: Light emitter, 2: Light receiver, 11: V/F converter, 12: Light emitter (for optical axis adjustment), 13: Light receiver (for optical axis adjustment), 14: Amplifier, 15: Speaker,
16: F/V converter, 17: Level meter, 1
8: LED display.

Claims (1)

[Scope of Claims] 1. A light beam detector in which a projector and a receiver are arranged separately, and the receiver detects changes in the infrared pulse beam emitted from the projector due to intrusion of an intruder, smoke, etc., and gives an alarm. A frequency conversion unit is provided on the photoreceiver side for converting a monitor signal output from the photoreceiver into a frequency signal corresponding to a signal level, and a frequency signal from the frequency conversion unit is provided on the light emitter side as an optical signal. and a transmitting section that transmits a wireless signal such as a radio wave signal, and a receiving section that receives the transmitted signal from the transmitting section on the projector side, and a visual and/or auditory signal corresponding to the reception frequency signal of the receiving section. 1. An optical axis adjustment device for a light beam detector, comprising: an output section that generates an output.