JPH04190497A - Infrared ray type crime preventive warning device - Google Patents

Abstract

PURPOSE:To speedily and accurately align optical axes even at the time of long-interval installation by adjusting the optical axes of the projector and photodetector of the infrared-ray type crime preventive warning device by a transmission unit and a reception unit for optical axis adjustment. CONSTITUTION:The transmission unit 3A is connected to the photodetection part 2A and reception part 4a for optical axis adjustment, an infrared-ray beam is projected from the projection 1, and the optical axes of the projector 1a and photodetector 2a are visually adjusted and aligned with each other, so that signal intensity corresponding to the degree of alignment between the optical axes is obtained. This signal intensity is displayed on a photodetection- side level meter 3b and further on a projection-side level meter 4b through the signal reception part 4a for optical axis adjustment. The optical axes are finely adjusted watching the displays so that the display indicates a maximum value. Consequently, the optical axes can easily, speedily, and accurately be adjusted. After the adjustment, the parts 2A, 3A, and 4A are disconnected and the adjustment is completed.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention constantly receives an infrared beam emitted from a projector by a receiver, and when an illegal intruder blocks this infrared beam, an alarm signal is issued. This is related to an infrared security alarm system.

<Prior Art> This type of infrared crime prevention alarm system has a light emitter 1a of an infrared emitter 1 and a receiver 2a of an infrared receiver 2 shown in FIG. 5 on both ends of a linear security area. , are installed with their optical axes aligned with each other. And the floodlight 1
It is composed of a light emitting element such as an infrared light emitting diode and a light emitting lens for forming a light emitting beam, and is driven to emit light at a predetermined oscillation frequency by the light emitting element or the light emitter driving section 1b, so that pulse modulation is possible. An infrared beam of light is emitted.

On the other hand, in the light receiving section 2, a light receiving unit 2a consisting of a light receiving lens and a light receiving element such as a photodiode receives the infrared beam and outputs an electric signal according to the amount of the received infrared light, and this electric signal is sent to the amplifier circuit. After being amplified with 2b,
The detection circuit 2C removes the disturbance light and converts the received signal into a signal based on the level of the pulse-modulated light only, and the signal discrimination circuit determines whether or not this signal level is below the set detection level. When the infrared beam from 1a is blocked by an illegal intruder and the received signal level falls below the set detection level, a detection signal is output, the alarm generator 2e is driven, and an alarm signal is output, indicating that there has been an illegal intruder. It is configured to notify you of this.

<Problems to be Solved by the Invention> By the way, this infrared security alarm system can set a straight security area from a short distance of several meters to a long distance of several hundred meters. As the distance increases, it becomes more difficult to align the optical axes of the light projector 1a and the light receiver 2a. Therefore, generally, as shown in FIG. 5, a level meter 2f such as an ammeter is connected to and built into the detection circuit 2e, or an external terminal for connecting the meter is provided, and the level meter 2f is used to detect the infrared rays of the light receiver 2a. While reading the signal level proportional to the amount of received light, set the receiver 2a so that the display level reaches the maximum value.
An optical axis adjustment method is used in which the direction of the optical axis is adjusted.

However, when adjusting the direction of the light projecting section 1, the display signal level of the light receiving section 2 cannot be read on the light projecting section 1 side because the distance is very far.

Therefore, the direction of the emitter 1a of the emitter 1 is adjusted visually to face the receiver 2a, and fine adjustments to align the optical axes are made using only the receiver 2a without looking at the level meter 2f. There is. Therefore, for example, if the mounting surfaces of the light emitter 1 and the light receiver 2 are not parallel to each other, or if the mounting heights are different, it is very difficult to align the optical axes accurately. However, each worker adjusts the orientation of the light emitter 1 and the light receiver 2 while communicating by radio, which not only requires extremely complicated adjustment work, but also requires a lot of time and effort. The reality is that you are wasting your time.

The present invention has been made in view of such conventional problems, and it is possible to easily and quickly adjust the optical axis between the emitter and the receiver even when the distance between the emitter and the receiver is relatively large. It is a technical problem to provide an infrared security alarm device that can perform the same operation and match accurately.

Means for Solving the Problems> In the present invention, as a technical means for achieving the above-mentioned problems, an infrared security alarm device is configured as follows. That is, a light projecting section having a projector that emits an infrared beam;
It consists of a light receiver that is placed opposite to always receive the infrared beam from the projector, and a light receiving part that is equipped with an alarm generator connected to this receiver, and when the infrared beam is blocked, it detects a human body, etc. In the infrared crime prevention alarm device that drives the alarm generator, the light receiving side display means for displaying an optical axis adjustment signal at a level corresponding to the amount of infrared light received by the light receiving section, and the optical axis adjustment signal is displayed on the light emitting section side. A transmitting unit for optical axis adjustment comprising a signal output means for outputting a signal to the light receiving section is provided separately from the light receiving section, and an external terminal for connecting the transmitting unit is provided on the light receiving section. The present invention is characterized in that an optical axis adjustment receiving unit consisting of a signal receiving means and a display means on the light emitting side thereof is provided separately for the light emitting section.

Further, the signal output means and the reception means may be constituted by a portable wireless device or an optical signal return/receiver.

Furthermore, instead of the configuration in which the above-described transmitting unit is provided separately from the light receiving section, the entire transmitting unit or a part thereof may be integrated into the receiving section.

<Function> When adjusting the orientation of the emitter and receiver so that their optical axes match when installing the device, first, if the transmitter unit for optical axis adjustment is wholly or partially separate from the light receiver. In this case, this transmitting unit is electrically connected to the light receiving section through an external terminal and is placed on the light receiving section side, and the receiving unit for optical axis adjustment is placed on the light projecting section side. Then, after the emitter and receiver are visually opposed so that their respective optical axes are approximately aligned, when the emitter emits an infrared beam, this infrared beam is received by the receiver and converted into an electrical signal, which generates an electric signal. For example, in a detection circuit, the signal is converted into a signal with a level corresponding to the amount of infrared light received, in other words, a signal with a signal strength corresponding to the degree of coincidence between the optical axes of the emitter and the receiver. This signal level is displayed on the display means such as a level meter of the transmitting unit, and the signal is also output as an optical axis adjustment signal from the signal output means to the receiving means of the receiving unit on the light projecting side. It is displayed on a display means such as a level meter.

Therefore, each worker who adjusts the light emitter and the light receiver can mutually make fine adjustments on both sides while looking at the level display of the optical axis adjustment signal at hand so that the display indicates the maximum value. Optical axis adjustment can be performed easily and quickly, and alignment can be achieved accurately. Further, since the transmitting unit and the receiving unit are used only for adjusting the optical axis, they can be used for adjusting the optical axis when installing various devices of the same type.

<Example> Hereinafter, preferred examples of the present invention will be described in detail with reference to the drawings.

In FIG. 1 showing the block configuration of the first embodiment of the present invention, the same or equivalent parts as in FIG. 5 are given the same reference numerals, and the explanation thereof will be omitted.

The difference from FIG. 5 is that the light receiving section 2A is provided with an external terminal 2g that can be externally connected to the detection circuit 2C, and the output signal of the detection circuit 2c connected via the external terminal 2g is used for optical axis adjustment. Optical axis adjustment signal transmitter 3 that outputs as a signal
a, and a light-receiving side level meter 3b that displays a signal level proportional to the amount of infrared light received by the light receiver 2a output from a detection circuit 2C similarly connected via an external terminal 2g. A unit 3A is provided, and further includes an optical axis adjustment signal receiving section 4a that inputs a signal from the optical axis adjustment signal transmitting section 3a, and a light projection side level meter 4b driven by this optical axis adjustment signal receiving section IC. The only configuration is that the optical axis adjustment optical axis adjustment cable 4A consisting of the following is disposed on the light projecting unit 1 side.

When installing the device, when adjusting the orientation of the emitter 1a and the receiver 2a so that their respective optical axes coincide, as shown in the figure, the transmitter unit 3A is connected to the light receiver 2 via the external terminal 2g.
Connected to the detection circuit 2C of A, the optical axis adjustment signal transmitter 3a
and the optical axis adjustment signal receiving section 4a, and the projector drive section 1b causes the projector 1 to emit an infrared beam. In this state, when the emitter 1a and the receiver 2a are visually placed to face each other so that their optical axes coincide, the infrared beam emitted from the emitter 1a is received by the receiver 2a and converted into an electrical signal. It is amplified by the amplifier circuit 2b and removed by the detection circuit 2C to generate a signal whose level corresponds to the amount of infrared light received using only pulse modulated light, in other words, according to the degree of coincidence between the optical axes of the emitter 1a and the receiver 2a. is converted into a signal with a given signal strength. This signal level is displayed on the light receiving side level meter 3b of the transmitting unit y) 3A, and the signal is sent as an optical axis adjustment signal from the optical axis adjustment signal transmitting section 3a to the optical axis adjustment signal receiving section of the receiving unit 4A. 4a and displayed on the light projecting side level meter 4b.

Therefore, each worker who adjusts the light emitter 1 and the light receiver 2 respectively looks at the level display of the received signal on the level meters 4b and 3b at hand, and mutually communicates with each other so that the display indicates the maximum value. Since fine adjustment is possible, optical axis adjustment can be performed easily and quickly, and accurate matching can be achieved. After this optical axis adjustment, the transmitting unit 3 is removed from the receiving section 2, and the connection between the optical axis adjustment signal transmitting section 2g and the optical axis adjusting signal receiving section 1C is also released.

FIG. 2 shows a schematic block configuration of a second embodiment of the present invention, in which the same or equivalent parts as in FIG. As a transmission means for the adjustment signal, a radio wave transmitter 3c is provided which outputs the output signal of the detection circuit 2C as a signal for optical axis adjustment as a radio wave, and as a reception means for the optical axis adjustment receiving unit 4B, a radio wave transmitter 3c is provided which outputs the output signal of the detection circuit 2C as a signal for optical axis adjustment. This system is equipped with a radio wave receiver 4c that receives the axis adjustment signal, and the received signal level of the radio wave receiver 4c is displayed on the level meter 4b, so in addition to obtaining the same effect as shown in Fig. 1, Since the adjustment signal is transmitted by radio waves, it is not necessary to connect the transmitting unit 3B and the receiving unit 4B, and these units 3B and 4B can be handled individually and independently.

Note that a commercially available portable wireless device such as a transceiver can be used as the radio wave transmitter 3c, and a commercially available portable wireless device such as a radio receiver or transceiver can be used as the radio wave receiver 4c. I can do it.

FIG. 3 shows a third embodiment of the present invention which is a modification of FIG. 2, in which the radio wave transmitter 3C of the transmitting unit 3B shown in FIG. A commercially available AM
, FM, shortwave, etc. radio receiver. The radio transmitter 3C is generally considerably cheaper than the radio receiver 4C, so it is built into the light receiving section 2B, and the receiving unit 4C uses the signal sound of the radio receiver that constitutes it to determine the level. is now displayed.

FIG. 4 shows a fourth embodiment of the present invention, and FIG.
Components that are the same or equivalent to those in the figures are given the same reference numerals. The optical axis adjustment transmitting unit 3C is provided with an optical signal output device 3g composed of a light emitting diode 3e and a light projecting lens 3f as a transmission means for the optical axis adjustment signal, and emits light by the output signal of the detection circuit 2C. The drive circuit 3d for driving the diode 3f to emit light and some components of the transmitting unit 3C of the light-receiving level meter 3b are the light-receiving section 2C.
It is built in. On the other hand, Signal Knit 4D for optical axis adjustment is
an optical signal receiver 4f that receives an optical axis adjustment signal output as an optical signal from the optical signal output device 3g of the transmitting unit 3C and converts it into an electrical signal by a condenser lens 4d and a phototransistor 4e; and an amplifier circuit 4g that amplifies the output signal of the meter 4f so as to drive the level meter 4b.

Note that the infrared beam output from the floodlight 1a as a warning signal has an intensity of several 10, which is normally required to detect a human body, taking into account attenuation due to fog, snow, frost, etc.
(The optical axis adjustment signal is only used when installing the device, so a small one is sufficient.)

Further, the optical system of the receiver 2a can also be used as the optical system 3f of the transmitting unit 3C by time division.

Furthermore, if the light projecting section 1 and the light receiving sections 2A to 2C are each provided with a level meter, these can also be used as constituent elements of the receiving unit and the transmitting unit.

<Effects of the Invention> As described above, according to the infrared security alarm device of the present invention,
Since the optical axis adjustment between the emitter and the receiver can be performed using the optical axis adjustment transmitting unit and the optical axis adjustment receiving unit, it can be done easily and quickly even when these are installed at relatively long intervals. , can be matched exactly.

Moreover, since the transmitting unit and the receiving unit can be used in common for adjusting the optical axis of the same type of apparatus, there is an advantage that the economical effect is large. −

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a block diagram of another embodiment of the invention, and FIG. 3 is a block diagram of main parts of still another embodiment of the invention. , FIG. 4 is a block diagram of still another embodiment of the present invention, and FIG. 5 is a block diagram of a conventional device. 1...Light emitter 1a...Emitter 2A to 2C...Light receiver 2a...Receiver 2e...Alarm generator 2g...External connection terminals 3A to 3C...Optical axis adjustment transmission units 3a, 3c,
3g... Signal output means 3b... Level meter (light receiving side display means) 4A to 4D
...Light receiving units 4a, 4c, 4f for optical axis adjustment - Receiving means 4b ... Level meter (emitter side display means) Patent Applicant Optex Co., Ltd. Agent Patent attorney Nishi 1) New Fig. 1 L--J

Claims (3)

[Claims] (1) A light emitter having a light emitter that emits an infrared beam; a light receiver having a light receiver disposed oppositely to always receive the infrared beam from the light emitter; and an alarm generator connected to the light receiver; In an infrared crime prevention alarm device that detects a human body or the like by blocking an infrared beam and drives the alarm generator, receiving an optical axis adjustment signal at a level corresponding to the amount of infrared light received by the light receiving section. An optical axis adjustment transmitting unit including a side display means and a signal output means for outputting the optical axis adjustment signal to the light projecting section is provided separately from the light receiving section, and the light receiving section includes: An external terminal for connection of the transmitting unit is provided, and an optical axis adjustment receiving unit consisting of a receiving means for the optical axis adjustment signal and a display means on the light emitting side thereof is provided separately for the light projecting section. Features an infrared security alarm system. (2) The infrared security alarm device according to claim (1), wherein the signal output means and the reception means are constituted by a portable wireless device or an optical signal transmitter/receiver. (3) Infrared type, characterized in that instead of the configuration in which the transmitting unit of claim (1) is provided separately from the light receiving section, the entire transmitting unit or a part thereof is integrated into the receiving section. Security alarm device.