JP2869938B2 - Detection device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a detection device for monitoring an intruder.

[Related Art] A detecting device is generally provided for monitoring an intruder.

This monitoring is performed by detecting radiation energy of a human body by a detecting element such as a pyroelectric element provided in the detecting device.

By the way, since the pyroelectric element provided in the detection device is provided inside the monitoring window, if the monitoring window is blindfolded with paint or tape, etc., the pyroelectric element cannot detect human body energy. There was a problem that the monitoring operation was disabled.

Therefore, the conventional detection device is provided with a self-defense function for detecting unauthorized blindfolding of the monitoring window. This is composed of a pair of light-emitting elements and a light-receiving element in the near-infrared wavelength band, and a processing circuit such as a CPU.The light from the light-emitting element is reflected by the monitoring window, and is detected and blocked by detecting the rate of incidence on the light-receiving element. It is to determine whether or not. As a result, when the screen is blindfolded, the detection light is increased in the light receiving element as compared with before, so that the processing circuit can determine that the screen is blinded and transmit an abnormal signal or the like.

[Problems to be Solved by the Invention] However, the conventional detection device has a problem that the self-defense function is incomplete. Since the light-emitting element and the light-receiving element use the near-infrared wavelength band, the light-receiving element receives light from the monitoring window even when it is not covered by the monitoring window when the outside of the detection device is bright. It was incorrectly determined that the screen was blindfolded.

The present invention has been made in view of the above problems,
It is an object of the present invention to provide a detection device capable of detecting a state of a blindfold on a monitoring window and constantly monitoring an intruder without being affected by extraneous light.

Means for Solving the Problems A detection device of the present invention for achieving the above object includes a detection element for detecting radiant energy of a human body through a monitoring window to detect an intruder. In the apparatus, a pair of a light emitting element and a light receiving element for detecting a blind state of the monitoring window, an illuminance detecting element for detecting illuminance outside the device via the monitoring window, and the illuminance detecting element detecting an illuminance caused by external light. And a processing circuit for determining that the light receiving element detects a blind state when the light receiving element detects reflected light from the monitoring window of the light emitting element, or radiation of a human body inside the device through the monitoring window. A detection device including a detection element for detecting energy and monitoring an intruder, comprising: a pair of a light-emitting element and a light-receiving element for detecting a blind state of the monitoring window; and monitoring by the light-receiving element. And a processing circuit for receiving the light emitted from the light-emitting element when external light incident through the light-receiving element is not detected, and determining that the light is reflected by the light-receiving element when the light-receiving element receives the reflected light. It is characterized by.

[Operation] According to the above-described configuration, the blinding of the monitoring window is detected by the light receiving element and the CPU provided in the detection device. Further, since the light receiving element and the processing circuit can detect the illuminance outside the detection device, it is possible to discriminate between extraneous light and improper blindfolding of the monitoring window, thereby preventing malfunction.

Example 1 An example of the detection device of the present invention is shown in a front view of FIG. 1 (a) and a sectional side view of FIG. 1 (d).

As shown in the drawing, the detection device 8 has a case 13 formed in a box shape.
A monitoring window 14 is provided on the front. This monitoring window 14
In the back, a pyroelectric element as a detection element (not shown) for detecting radiant energy of an intruder, a pair of light emitting elements 16a and a light receiving element 16b are provided, and further, an illuminance for measuring external illuminance through the monitoring window 14. A measuring element 15 is provided. Also,
The illuminance element 15 is provided so as not to receive the light of the light emitting element 16a. The signals of these elements are input to a processing device (CPU) 19 provided inside the detection device 8.

FIG. 2 is a block diagram of the configuration of the above-described electric circuit provided inside the detection device 8.

Next, the operation of the detection device having the above-described configuration will be described with reference to the timing chart of FIG.

 The detecting device 8 monitors an intruder by using a pyroelectric element.

By the way, there is a case where an action of preventing the detection device 8 from detecting a human body is performed. For example, when the monitoring window 14 of the detection device 8 is blindfolded, the pyroelectric element cannot operate. In this case, since the pyroelectric element cannot detect whether it is blindfolded or not, there is a risk that the monitoring state of the safe 1 may become substantially impossible.

Therefore, the detection device 8 has a self-defense function for determining a blind state of the monitoring window 14.

This function is used for the illuminance measurement element 15, the light emission and light reception elements 16a and 16
b Further achieved by the CPU 19.

That is, the illuminance of light incident from the outside of the detecting device 8 through the monitoring window 14 is measured by the illuminance measuring element 15 and output to the CPU 19. The CPU 19 also operates the light emitting element 16a and the light receiving element 16b. The light of the light emitting element 16a is normally transmitted from the monitoring window 14 to the outside. Therefore, the monitoring window
If 14 is covered by a blindfold, light emitting element 16a
The light is reflected by the blindfold and detected by the light receiving element 16b,
If the monitoring window 14 is not covered with a blindfold,
The light 16a is not received by the light receiving element 16b.

Also, when the outside of the detector is bright in the daytime, etc.
Even if there is no blindfold in 14, the detection device 8
External light enters inside and light reception by the light receiving element 16b is detected.However, since the illuminance measuring element 15 similarly detects a certain amount of illuminance of the external light, in this case, the CPU 19 is not blindfolded. No judgment (Fig. 3).

Also, of course, when the monitoring window 14 is blindfolded,
Even when the outside is in a bright state, the illuminance measuring element 15 does not detect a certain amount of illuminance due to external light, and the light receiving element 16b detects reflected light due to blinding of the light emitting element 16a, and the CPU 19 monitors. It can be determined that the window 14 is blindfolded (FIG. 3).

When the monitoring window 14 is blindfolded at night when the outside is dark, the light receiving element 16b receives light reflected by the light emitting element 16a, and the illuminance measuring element 15 detects a certain amount of illuminance due to external light. Otherwise, the CPU 19 determines that the monitoring window 14 is blindfolded (FIG. 3).

Further, when the monitoring window 14 is not blindfolded, the light receiving element 16B does not detect light reception, so that it can be determined that it is not blindfolded (FIG. 3).

As described above, when the light receiving element 16b detects light and the illuminance measuring element does not detect illuminance, the CPU 1
9 determines that the monitoring window 14 is blindfolded.

Even if the light receiving element 16 detects light, if the light is due to external light, the illuminance is detected by the illuminance detecting element 15 at the same time, so that the detecting device 8 malfunctions due to external light such as sunlight. Do not wake up.

Second Embodiment Next, a second embodiment of the present invention will be described.

In the present embodiment, as shown in FIG.
The illuminance due to light incident from outside is measured.

Hereinafter, the operation will be described with reference to FIG. First, a case where the outside is bright, such as in the daytime, will be described. Watch window
When the screen 14 is not blindfolded, external light enters the detection device 8 through the monitoring window 14 and has an illuminance equal to or more than a certain amount.

The CPU 19 operates at regular intervals (for example, 100 ms) at regular intervals (for example, 100 ms).
Check the received light amount of b. In the check shown in FIG. 5, the light receiving element 16b detects light incident from the outside and outputs it to the CPU 19. When light is detected by the light receiving element 16b by this check, the CPU 19 determines that the monitoring window 14 is not blindfolded. Further, the light emitting element 16a does not perform the light emitting operation.

Next, a case where the monitoring window 14 is blindfolded when the outside is bright will be described. In the check shown in Fig. 5,
As described above, the CPU 19 checks the amount of light received by the light receiving element 16b. However, since the monitoring window 14 is blindfolded, no external light enters the detection device, and the light receiving element 16b does not receive light. If no light is received by the light receiving element 16b, the CPU 19 proceeds to the next light emitting element 16b.
Flashes a. The light emitted by the light emitting element 16a is
And is received by the light receiving element 16b. CPU19
By detecting the light emission of the light emitting element 16a and the light reception of the light receiving element 16b, it is determined that the monitoring window 14 is blindfolded.

Next, a case where the outside of the detection device is dark at night or the like will be described.

When there is no blindfold, the light receiving element 16b does not receive light in the check by the CPU 19 as shown in FIG. 5 because the outside is dark. The CPU 19 causes the light emitting element 16a to emit light because there is no light receiving output of the light receiving element 16b. Since the light emitted from the light emitting element 16a passes through the monitoring window 14, the light receiving element 16b does not detect light. Therefore, the CPU 19 determines that the monitoring window 14 is not blinded by the light emission of the light emitting element 16a and the non-light reception of the light receiving element 16b.

When it is blindfolded by the monitoring window 14, the light receiving element 16b does not receive light as shown in the check in FIG. CPU19
Operates the light emitting element 16a to emit light in the same manner as described above, and inputs the light receiving output of the light receiving element 16b. In this case, since the monitoring window 14 is blindfolded, the light of the light emitting element 16a is reflected and received and output by the light receiving element 16b. Therefore, the CPU 19 determines that the monitoring window 14 is blindfolded. FIG. 6 is a flowchart for explaining the operation.

[Effects of the Invention] According to the detection device of the present invention, even if the monitoring window is improperly blindfolded, it can be detected, and the detection of this blindfolding is performed according to the degree of light outside the detection device. It is possible to reliably detect without being affected.

[Brief description of the drawings]

FIG. 1 is a structural explanatory view showing one embodiment of the present invention, and FIG.
FIG. 3 is a block diagram showing an electrical configuration, FIG. 3 is a timing diagram for explaining operation, FIG. 4 is a configuration explanatory diagram showing another embodiment of the present invention, and FIG. 5 is a timing diagram for explaining operation. ,
FIG. 6 is a flowchart for explaining the operation. DESCRIPTION OF SYMBOLS 1 ... Safe, 3 ... Door, 5 ... Detection device, 6 ... Lead wire connection unit, 8 ... Detection device, 10 ... Mounting plate,
11 ... Mounting plate, 12 ... Magnet, 13 ... Case, 14 ...
… Monitor window, 15… Illuminance measuring element, 16a …… Light emitting element, 16b
…… Light receiving element, 19 …… CPU, 20 …… Display unit, 21 …… Reed switch.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-195587 (JP, A) JP-A-60-104993 (JP, U) JP-A-61-152931 (JP, U) (58) Investigation Field (Int.Cl. ⁶ , DB name) G08B 13/191 G01V 9/04 G01J 1/02

Claims (2)

(57) [Claims] 1. A detecting device for monitoring an intruder, comprising a detecting element for detecting radiant energy of a human body inside the device through a monitoring window, wherein a pair of light emitting elements for detecting a blind state of the monitoring window and a light receiving device are provided. An element, an illuminance detection element for detecting illuminance outside the device via the monitoring window, and the light receiving element detects light reflected by the monitoring window of the emission element when the illuminance detection element does not detect illuminance due to external light. And a processing circuit for judging a blindfolded state in the case where the detection is performed. 2. A detecting device for monitoring an intruder, comprising a detecting element for detecting radiant energy of a human body inside the device through a monitoring window, wherein a pair of light emitting elements for detecting a blind state of the monitoring window and a light receiving device are provided. A process of detecting the element and the light-emitting element when external light incident through the monitoring window by the light-receiving element is not detected, and determining a blind state when the light-receiving element receives reflected light of the emitted light from the monitoring window. A detection device comprising a circuit.