JP3099248B2 - Distance measuring intruder detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for detecting an intruder in a detection area based on the distance to the intruder.
The present invention relates to an improvement of a distance measuring type intruder detector used for notifying a visitor, controlling an automatic door, and the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
There is provided an active object detector that receives light reflected from an object by light receiving means 2 and detects an intruder 9 in a detection area based on information included in the reflected light.

For example, as an object detector for detecting an intruding object based on the amount of reflected light received, an object detector that determines that an intruding object is present in a detection area when the amount of reflected light exceeds a predetermined threshold, There is provided an apparatus that determines that an object has entered a detection area when the amount of change exceeds a predetermined threshold value by focusing on the change.

As the light projected from such an active object detector to the detection area, the above-mentioned infrared rays, ie, invisible light, which cannot be seen by human eyes, is used.

[0005] By using this infrared ray, that is, invisible light, an intruder 9 has entered the detection area.
In addition, it is not known that the detection is being performed.

[0006]

However, as described above, since infrared light, that is, invisible light which cannot be seen with the eyes, is used, when installing or adjusting the detection area of the object detector, the work is required. In the direction in which the object detector is heading, that is, in the direction in which the infrared light is emitted from the light emitting means 1, for example, move left and right several times to perform a walking test to confirm at which position the object detector moves. It was necessary to set the detection area while doing so.

[0007] For this reason, there has been a problem that workability is poor and inefficient.

In the former configuration in which the presence or absence of an intruding object in the detection area is detected based on the amount of received light of the reflected light, the object U exists in the detection area D of the detector S as shown in FIG. In this case, even if the object is not an intruding object, the object is detected. Therefore, it is necessary to satisfy a constraint condition that another object does not exist in the detection area D. That is, since the installation conditions are restricted, there is a problem that the apparatus cannot be used in a place where a large number of articles such as ornaments, luggage, and plants are present, such as a storefront.

In the latter configuration in which the presence or absence of an intruding object in the detection area is detected based on the amount of change in the amount of received light of reflected light, the amount of change in the amount of received light is detected. 12), there is no change in the amount of received light, and only when the intruding object moves, the rate of change in the amount of received light increases as shown in FIG. Can be avoided.

However, since the presence or absence of an intruding object is detected based on the amount of reflected light, there is a problem that it is affected by the reflectance of the intruding object and the reflectance of the background. That is,
The amount of light received from the object that has entered the detection area,
When the amount of light received by the background is almost equal to
As shown in FIG. 12C, the rate of change in the amount of received light is small, and the presence or absence of an intruding object cannot be detected. That is, FIG.
As shown in FIG. 3, for the background a and the object b, the distance and the amount of received light have different relationships depending on the respective reflectances. , There is no change in the amount of received light, and such a positional relationship is called a dead zone. Also,
When the infrared light from the light projecting means is projected to the open space, no reflection by the background occurs. However, as shown in FIG.
When the reflectance is high (for example, the body of an automobile or a window glass), the change rate of the received light amount is as shown in FIG.
Therefore, there is a problem that false information is generated as a result.

Because of the various problems described above, when using an object detector that detects an intruding object based on the amount of reflected light, it is necessary to take into account the background color and reflectivity, and to detect objects with high reflectivity. It is necessary to satisfy the constraint condition that the detector is installed so that the detection area is set in a direction where the object does not pass or an object having a high reflectance is placed. In short, even when an object is detected based on a change in the amount of received light of reflected light, there is a problem that there are restrictions on the installation location of the detector and the installation location is limited.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem, and it is possible to visually and promptly and accurately set a detection area at the time of installation or adjustment. It is an object of the present invention to provide a distance-measuring type intruder detector in which restrictions on conditions are relaxed.

[0013]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above-mentioned object, and has an infrared light emitting device for distance measurement, a visible light light emitting device, and a light emitting device arranged in front of the infrared light emitting device. A lens, a beam splitter disposed between the light projecting lens and the infrared light emitting element and emitting light to the light projecting lens side, and the infrared light emitting element and the visible light light emitting element It is arranged at a position orthogonal to the beam splitter, and has a structure in which the optical axes of infrared radiation light and visible light radiated outward from the light projecting lens coincide with each other, and further drives the visible light emitting element A light projecting means provided with a test switch to be provided, and the reflected light of the light beam by the intruder entering the detection area is condensed by the light receiving lens and condensed on the light receiving surface of the position sensor arranged on the image plane of the light receiving lens Spot A light receiving means for outputting a position signal corresponding to the position of the condensed spot displaced on the light receiving surface of the position sensor according to the distance to the intruder, and a distance calculation for obtaining the distance to the intruder based on the position signal Means, presence determination means for outputting a presence signal when the distance to the intruder determined by the distance calculation means is within a predetermined distance range, and the distance to the intruder determined by the distance calculation means within a unit time. A movement determining means for outputting a movement signal when the distance has changed by a predetermined distance or more, and a notification for determining that an intruder is present in the detection area and outputting a notification signal when the presence signal and the movement signal are simultaneously output. Determination means.

According to a second aspect of the present invention, there is provided an infrared light emitting element for distance measurement, a visible light emitting element, a light projecting lens disposed in front of the infrared light emitting element, and a light projecting lens. A beam splitter that is disposed between the infrared light emitting element and emits light toward the light projecting lens; and wherein the infrared light emitting element and the visible light emitting element are orthogonal to the beam splitter. And a structure in which the optical axes of the infrared radiation emitted from the projection lens and the visible light coincide with each other, and further provided with a test switch for driving the visible light emitting element. The light means and the reflected light of the light beam by the intruder into the detection area are condensed by the light receiving lens, and a condensed spot is formed on the light receiving surface of the position sensor arranged on the image plane of the light receiving lens to form According to distance A light receiving unit that outputs a position signal corresponding to the position of the condensed spot displaced on the light receiving surface of the position sensor and outputs a light receiving signal corresponding to the total amount of received light, and obtains a distance to the intruder based on the position signal. Distance calculating means, presence determining means for outputting a presence signal when the distance to the intruder obtained by the distance calculating means is within a predetermined distance range, and a total amount of received light within a unit time based on the received light signal Movement determination means for outputting a movement signal when the amount of light changes more than the amount of light, and a notification determination for determining that there is an intruder in the detection area and outputting a notification signal when the presence signal and the movement signal are output simultaneously. Means.

According to a third aspect of the present invention, the visible light emitting device is driven for a predetermined time when the test switch is turned on.

[0016]

According to the apparatus of the present invention, the test switch is driven to emit visible light from the visible light emitting element only when installing or adjusting the detector.

Then, the visible light has a structure in which the optical axis coincides with the infrared light emitted from the infrared light emitting element by the beam splitter. Light is emitted.

Since this visible light is visible,
The infrared detection area can be checked at a glance.

After confirming and setting the detection area,
The test switch is turned off to stop emitting visible light from the visible light emitting element.

After that, only infrared rays from the infrared light emitting element for distance measurement are emitted to the detection area.

When the intruder enters the detection area, the reflected light of the emitted infrared light from the intruder is received by the light receiving means as a condensed spot, and the distance to the intruder is calculated by the distance calculating means. When the distance is within the predetermined distance range, a detection signal is output, and the intrusion of an intruder is detected.

Further, since this infrared ray is invisible, the intruder does not know the detection state.

Further, in a state in which only infrared rays are projected after the detector is installed or adjusted, that is, in a detection progress state, the distance to an intruder obtained based on a position signal output from the light receiving means. The information is used to determine whether the intruder is within a predetermined distance range and whether the intruder is moving, and whether the intruder is within the predetermined distance range. , And outputs a notification signal only when it is moving,
The intruder can be detected without being affected by the background, the color of the intruder, and the reflectance, and the restrictions on the installation location are reduced.

According to the second aspect of the present invention, in a state where only the infrared rays are projected after the detector is installed or adjusted, that is, in a detection progress state, the distance to the intruder outputted from the light receiving means. It is determined whether or not the intruder is within a predetermined distance range based on the position signal including the information, and whether or not the intruder has moved based on the light receiving signal corresponding to the total amount of light received by the light receiving means. The intruder is within a predetermined distance range, and outputs a notification signal only when moving, so when an object with a large reflectance passes outside the detection area Even if it is determined that the intruder has moved due to the change in the total amount of received light,
Since the detection area is limited by the distance range, a notification signal is not output depending on an object outside the detection area, and thus false alarm can be prevented. That is, even if the detection area is set to an open space, no false alarm is generated, and there is an advantage that restrictions on the installation location are reduced.

According to the third aspect of the present invention, for example, when the test switch is turned on by using a timer circuit, the visible light emitting element is driven for a predetermined time for the adjusting operation. Test work such as installation and adjustment should be performed.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the light projecting means 1 includes an infrared light emitting element 12 for distance measurement, a visible light light emitting element 15, and a light projecting lens 1 disposed in front of the infrared light emitting element 12.
1, the light projecting lens 11 and the infrared light emitting element 1 described above.
2, a beam splitter 16 that emits light toward the light projecting lens 11 is provided.

The infrared light emitting element 12 and the visible light emitting element 15 are combined with the beam splitter 16.
And the optical axes Xa and Xb (see FIG. 1) of infrared radiation light Ya and visible light Yb (see FIGS. 2 and 3) radiated outward from the light projecting lens 11 with respect to Are matched.

Further, a test switch 17 is provided in a light emitting circuit 18 for driving the above visible light emitting element 15.

This test switch 17 is not shown,
When the test switch 17 is turned on, the visible light emitting element 15 may be driven by a timer circuit or the like for a predetermined time for adjusting the detection area.

The light emitting element 12 receives the clock pulse output from the oscillation circuit 13 (see FIG. 5).
4 (see FIG. 5), the light beam is flickered, and the timing of projecting the light beam is set by the clock pulse.

In such a distance measuring apparatus, the test switch 17 is driven to emit visible light Ya from the visible light emitting element 15 only when the detector K is installed or adjusted.

Then, this visible light Yb is structured by the beam splitter 16 so that the infrared radiation light Ya projected from the infrared light emitting element 12 and the optical axes Xa and Xb coincide with each other. Is projected in the same projection area, that is, the same area as the detection area.

Since the visible light Yb is visible, a detection area by the infrared radiation Ya can be confirmed at a glance.

After confirming and setting this detection area,
The test switch 17 is turned off to stop the emission of the visible light Yb from the visible light emitting element 15.

Thereafter, only the infrared radiation Ya from the infrared light emitting element 12 for distance measurement is projected onto the detection area.

When the intruder 9 enters the detection area, the reflected light Yc of the projected infrared radiation from the intruder is received by the light receiving means 2 as a condensed spot, and the distance calculating means 3 (see FIG. 5). ), The distance to the intruder 9 is calculated. When the distance is within the predetermined distance range, a detection signal is output, and the intrusion of the intruder 9 is detected.

Further, since the infrared radiation light Ya is invisible, the intruder 9 does not know the detection state.

As shown in FIG. 1, the light receiving means 2 includes a light receiving lens 21, a position sensor 22, and a current-voltage circuit 23.
a, 23b (see FIG. 5).

The reflected light diffusely reflected by the intruder 9 into the detection area is condensed through the light receiving lens 21 to form a condensed spot on the image plane of the light receiving lens 21 and is disposed on the image plane of the light receiving lens 21. Then, the light is received by the position sensor 22 constituting the light receiving means 2 together with the light receiving lens 21.
A PSD is used as the position sensor 22, and a pair of position signals I1 and I2 corresponding to the position of the condensed spot are output. Here, the light projecting lens 11 and the light receiving lens 21 are arranged on the same plane, and the light receiving surface of the position sensor 22 is orthogonal to the optical axis of the light receiving lens 21. Each position signal I
Since 1 and I2 are current signals, they are converted into voltage signals V1 and V2 by the current / voltage conversion circuits 23a and 23b, respectively, and then input to the distance calculation means 3 composed of an integrated circuit, and the distance to the intruder 9 is calculated. A corresponding distance signal is output. The distance calculating means 3 receives the clock pulse from the oscillation circuit 13 and is controlled in synchronization with the light beam projection timing. The distance calculating means 3 removes and processes an unnecessary signal not corresponding to the light beam, thereby processing the signal. The noise-to-noise ratio has been improved. The distance signal is input to a notification determination unit 4 having a microcomputer as a main component. Notification determination means 4
Is a reference distance data setting unit 41 for providing a reference distance defining a detection area, a determination circuit 42 for comparing the magnitude relationship between the distance corresponding to the distance signal and the reference distance, and a determination circuit 42
Signal generation circuit 43 for applying a reference clock signal to
It is composed of When the reference distance is one,
The determination circuit 42 sets the detection area within the reference distance or longer than the reference distance as a detection area, and outputs a notification signal to drive the display circuit 5 when the distance from the intruder 9 (distance signal) is within the detection area. Or controls other devices through the output circuit 6. When there are two reference distances,
In the determination circuit 42, a detection area is set between the two reference distances,
An information signal is output when the distance corresponding to the distance signal is between the two reference distances.

Here, a triangulation method using a PSD adopted as a distance measuring method will be described. The basic configuration for the distance measurement is as shown in FIG. 4. The light beam is emitted from the light projecting means 1 to the object O, and the diffuse reflection light is collected by the light receiving lens 21. The condensed spot formed on the image plane of the light receiving lens 21 is received by the position sensor 22 which is a PSD. The position sensor 22 is an element that can obtain an electric signal corresponding to the position of the condensed spot, and the distance to the object O is calculated based on the electric signal based on a triangulation method. That is, if the position of the object O changes from A to B to C and the distance between the light projecting means 1 and the object O changes, the position of the condensed spot formed on the light receiving surface of the position sensor 22 becomes Since it moves on the paper surface as a⇒b⇒c, the distance to the object O can be detected by using PDS which is a one-dimensional position detecting means capable of detecting a position on the paper surface.

The PSD used as the position sensor 22 is a photovoltaic element having a pin structure and having output electrodes E1 and E2 at both ends in the longitudinal direction as shown in FIG. When P is irradiated, p which is a high resistance layer
The layer is formed by the irradiation position of the converging spot P and each of the output electrodes E1, E2.
2 and are divided in inverse proportion to the distance between
2, output currents I1 and I2 obtained by dividing the total current I are taken out. That is, each output electrode E1
, E2 output currents I1, I2 from output electrodes E1,
The resistance between E2 is ZS, and the division ratio of the p layer is Z1: Z2.
Then, I1 = (Z2 / ZS) .I ... I2 = (Z1 / ZS) .I ... If the distance from the electrode E1 to the converging spot P is x and the distance between the two output electrodes E1 and E2 is L, then x = (Z1 / ZS) .L. And Z1 and Z
S is erased, and the distance x is changed to the output currents I1, I2 and the electrode E1.
, E2, the distance L is expressed as (1 / x) = {1+ (I1 / I2)} / L. On the other hand, as shown in FIG. 2, if the distance between the optical axis of the light projecting means 1 and the output electrode E1 is BL, and the distance between the position sensor 22 and the light receiving lens 21 is F, the distance from the light receiving lens 21 to the object O is The distance R is R = BL ・ F / x..., And if the equation is substituted into the equation, R = {1+ (I1 / I2)}｝ BL ・ F / L. Here, in the adjusted apparatus, BL, F, and L become constants, so that the distance R to the object O can be obtained from the output currents I1, I2 of the position sensor 22. That is, as described above, the output currents I1 and I2 of the position sensor 22 are input to the distance calculation means 3 and the above-described calculation is performed to obtain a distance signal corresponding to the distance to the object O. It is.

According to the above configuration, since the distance to the intruder 9 is determined and the notification signal is output, the presence or absence of the intruder 9 can be detected regardless of the background color and the reflectance. Further, as shown in FIG. 7, if the intruder 9 enters the detection area at the time t1, a notification signal is output until the intruder 9 leaves the detection area at the time t2. Therefore, when used for controlling the opening and closing of an automatic door, or for controlling lighting that is lit only while a person is standing in front of a show window,
The inconvenience of closing the door or turning off the light while the person is in the detection area can be prevented. The timer for the off-delay operation for closing the door or turning off the illumination is provided at time t2 as shown in FIG.
In FIG. 8 (a), when a person starts the detection area at the time of leaving the detection area (FIG. 8A shows a state where the person enters the detection area at time t1 and the person exits the detection area at time t2).
After a lapse of a predetermined time T1, it is possible to control to automatically close the door or turn off the light. Presence judging means 7
Outputs a presence signal when the distance to the intruder obtained by the distance calculation means 3 is within a predetermined distance range, as shown in FIG. 7, and the movement determination means 8 obtains the presence signal by the distance calculation means 3. A movement signal is output when the distance to the intruder changes over a predetermined distance within a unit time. Notification determination means 4
Is configured to output a notification signal when a presence signal and a movement signal are simultaneously obtained. Presence determination means 7,
The movement determination means 8 and the notification determination means 4
Data as a main component. Movement determination means 8
In the condition determination for generating a movement signal in, when the unit time is set relatively short, the distance difference between the start time and the end time of the unit time (that is, the rate of change in distance) can be used.
When the unit time is set to be relatively long, the difference between the maximum value and the minimum value of the distance in the unit time may be used.
Here, since a human is a detection target, a distance difference as a condition for generating a movement signal may be about 20 cm.

As described above, according to the present invention, since the presence determining means 7 is provided, only the predetermined distance range can be set as the detection area. It is possible to prevent a malfunction due to the reflected light. In addition, since the movement determination means 8 is provided, the notification signal is not output for an object that is stationary in the detection area, and is used in a place such as a storefront where many articles are placed. There is an advantage that there is no restriction on the installation location even when it is used for informing the visitor.

In the meantime, the presence judging means 7 normally gives the reference distance as described above, but it may be troublesome to update the data in order to change the reference distance according to the installation conditions. is there. Therefore, in this embodiment, as shown in FIG. 1, the detection area is changed according to the installation conditions by moving the light receiving lens 21 in a direction orthogonal to the optical axis (indicated by a solid line and a broken line). It is supposed to. That is, the position at which the straight line connecting the center of the light receiving surface of the position sensor 22 and the center of the light receiving optical system 21 intersects the optical axis of the light projecting means 1 is defined as the boundary distance of the detection area.
In general, a detection area is set within a distance range closer to the light projecting means 1 than the boundary distance. In this case, in FIG. 1, the presence signal is output when a converging spot is formed below the center of the light receiving surface of the position sensor 22, and the existence signal is not output when a converging spot is formed above. Then, the criterion of the existence determining means 7 may be fixedly set. When it is desired to change the boundary distance, the light receiving optical system 21 is moved, and the light receiving optical system 21 may be set closer to the light projecting means 1 as the boundary distance becomes shorter. By employing such a configuration, the detection area can be changed only by adjusting the position of the light receiving optical system 21. If the condition for generating the presence signal is reversed by the presence determination means 7 (that is, if the condition for the magnitude relationship of the distance for generating the presence signal is reversed), the detection area is shifted from the boundary distance to the far side. Can also be set to

(Embodiment 2) The light-emitting means 1 in this embodiment is the same as that of the embodiment of the above-mentioned claim 1, and the explanation is omitted.

In this embodiment, as in the first embodiment, the intruder 9 exists in the detection area and the intruder 9
A notification signal is output when the vehicle moves. However, in the above-described embodiment, the movement of the intruder 9 is detected based on the distance change within the unit time.
This embodiment is different in that the movement of the intruder 9 is detected based on a change in the total amount of received light within a unit time.

That is, the entire current of the position sensor 22 is used as a light receiving signal reflecting the total amount of received light, and the movement judging means 8 determines when the total amount of received light has changed to a predetermined amount or more within a unit time based on the received light signal. To output the movement signal. The movement determining means 8 adds an output voltage V1, V2 of each current / voltage conversion circuit 23a, 24b to obtain a voltage output corresponding to the total amount of received light,
It comprises a differentiating circuit 82 for differentiating the output voltage of the adding circuit 81, and a comparing circuit 83 for comparing the output of the differentiating circuit 82 with a predetermined reference voltage Vr. If the intruder 9 moves, the total received light amount of the reflected light changes, so that the output voltage of the differentiating circuit 82 increases. If this voltage exceeds the reference voltage Vr input to the comparing circuit 83, the comparing circuit The movement signal is output from 83. The moving signal obtained in this manner is handled in the same manner as the moving signal of the third embodiment. When the presence signal and the moving signal are generated simultaneously, the notification signal is output from the notification determining means 4. It is output.

[0049]

According to the present invention, when the detector is installed or adjusted, the detection area of the infrared radiation emitted from the infrared light emitting element is simultaneously adjusted with the projection of the infrared radiation. By projecting visible light from the visible light emitting element and using a beam splitter to match the optical axis of the visible light with the infrared radiation, the detection area of the infrared radiation can be known at a glance. it can.

Therefore, there is an effect that the work of setting the detection area at the time of installation or adjustment can be visually and promptly and accurately performed.

Further, information on the distance to the intruder obtained based on the position signal output from the light receiving means is determined based on whether the intruder is within a predetermined distance range, and whether the intruder moves. Since it is used for two types of judgments, that is, whether or not the intruder exists within a predetermined distance range, and outputs a notification signal only when the intruder is moving,
There is an advantage that an intruder can be detected without being affected by the background, the color of the intruder, and the reflectance, and restrictions on the installation location are reduced.

According to the second aspect of the present invention, it is determined whether or not the intruder is within a predetermined distance range based on the position signal output from the light receiving means and including the distance information to the intruder, Also, since it is determined whether or not the intruder has moved based on the light receiving signal corresponding to the total amount of light received by the light receiving means, when the intruder is within a predetermined distance range and is moving, Only the notification signal is output. Therefore, even if it is determined that the intruder has moved due to a change in the total amount of received light when an object having a high reflectance passes outside the detection area, the detection area is limited by the distance range, and thus the detection area is limited. Depending on the object, a notification signal is not output, false alarms can be prevented, and false alarms do not occur even if the detection area is set to an open space.

[Brief description of the drawings]

FIG. 1 is a block diagram of a main part showing a basic configuration of an optical system according to the present invention.

FIG. 2 is a schematic side view showing a state at the time of a test in which projection of infrared radiation light and projection of visible light are simultaneously performed.

FIG. 3 is a schematic perspective view of the inside of a room showing a state at the time of an actual test in the distance measuring intruder detector of the present invention.

FIG. 4 is a block diagram showing a basic circuit configuration of a distance-measuring intruder detector of the present invention.

FIG. 5 is a diagram conceptually illustrating the basic principle of triangulation employed in the present invention.

FIG. 6 is an explanatory diagram showing a basic structure of a position detection sensor.

FIG. 7 is a time chart showing a basic operation of the distance-measuring intruder detector.

FIG. 8 is an explanatory diagram of a basic operation of an off-delay timer.

FIG. 9 is a block diagram showing a basic circuit configuration of a distance-measuring intruder detector according to claim 2;

FIG. 10 is a diagram illustrating an example of use in a conventional distance-measuring intruder detector.

FIG. 11 is a perspective view showing an example of use that poses a problem in a conventional distance-measuring intruder detector.

FIG. 12 is an explanatory diagram of a basic operation in a conventional distance-measuring intruder detector.

FIG. 13 is a diagram showing the relationship between the distance of an intruder and the amount of received light in a conventional distance-measuring intruder detector.

FIG. 14 is an explanatory diagram showing a problem of the conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 light projecting means 11 light projecting lens 12 infrared light emitting element 15 visible light emitting element 16 beam splitter 17 test switch 2 light receiving means 3 distance calculating means 4 notification determining means 5 display means 6 output means 7 presence determining means 8 movement determining means 9 intrusion Xa Optical axis of infrared radiation Xb Optical axis of visible light Ya Infrared radiation Yb Visible light

Claims (3)

(57) [Claims] An infrared light emitting element for distance measurement, a visible light emitting element, a light projecting lens disposed in front of the infrared light emitting element, and a light emitting lens disposed between the light projecting lens and the infrared light emitting element. A beam splitter that emits light to the light projecting lens side, and the infrared light emitting element and the visible light light emitting element are disposed at a position orthogonal to the beam splitter, and are located outside the light projecting lens. Light emitting means provided with a test switch for driving the visible light emitting element, and a light emitting means provided with a test switch for driving the visible light emitting element. The reflected light of the light beam by the intruder is condensed by the light receiving lens to form a condensed spot on the light receiving surface of the position sensor placed on the image plane of the light receiving lens, and on the light receiving surface of the position sensor according to the distance to the intruder Displace in Light receiving means for outputting a position signal corresponding to the position of the condensed spot; distance calculating means for calculating a distance to the intruder based on the position signal; and a distance to the intruder determined by the distance calculating means within a predetermined distance range Presence determination means that outputs a presence signal when the distance is within, and movement determination means that outputs a movement signal when the distance to the intruder determined by the distance calculation means changes by a predetermined distance or more within a unit time, A distance determination type intruder detection, comprising: notification determination means for determining that there is an intruder in the detection area when the presence signal and the movement signal are output simultaneously, and outputting a notification signal. vessel. 2. An infrared light emitting element for distance measurement, a visible light light emitting element, a light projecting lens disposed in front of the infrared light emitting element, and a light emitting lens disposed between the light projecting lens and the infrared light emitting element. A beam splitter that emits light to the light projecting lens side, and the infrared light emitting element and the visible light light emitting element are disposed at a position orthogonal to the beam splitter, and are located outside the light projecting lens. Light emitting means provided with a test switch for driving the visible light emitting element, and a light emitting means provided with a test switch for driving the visible light emitting element. The reflected light of the light beam by the intruder is condensed by the light receiving lens to form a condensed spot on the light receiving surface of the position sensor placed on the image plane of the light receiving lens, and on the light receiving surface of the position sensor according to the distance to the intruder Displace in A light receiving means for outputting a position signal corresponding to the position of the condensed spot and outputting a light receiving signal corresponding to the total amount of received light; a distance calculating means for obtaining a distance to the intruder based on the position signal; and a distance calculating means. Presence determining means for outputting a presence signal when the obtained distance to the intruder is within a predetermined distance range, and moving when the total amount of received light changes to a predetermined amount or more within a unit time based on the received light signal A movement determination unit that outputs a signal; and a notification determination unit that determines that there is an intruder in the detection area and outputs a notification signal when the presence signal and the movement signal are output simultaneously. Characteristic ranging intruder detector. 3. The structure according to claim 1, wherein the visible light emitting element is driven for a predetermined time when the test switch is turned on.
The distance measuring type intruder detector according to claim 2.