JPH05274562A - Invader detector for prevension of crime - Google Patents

Abstract

PURPOSE:To accurately detect an invader while surely preventing the generation of malfunction by providing this invader detector with a sensitivity changing means for raising the detection sensitivity of an invader when an output signal level from a sound sensing means exceeds a prescribed value. CONSTITUTION:In an ordinary state, the output of a comparator 9 is in a low level, a transistor(TR) Q in an amplification factor variable circuit 6 is in an OFF state and the amplification factor of an amplifier A is previously set up so as to obtain comparatively low detection sensitivity. If an invader illegally invades, a sound wave with low frequency less than an audible area is converted into an electric signal by microphone 7, an amplification signal from the amplifier 8 exceeds the reference level of the comparator 9, a high level signal is outputted from the comparator 9, and the TR Q of the circuit 6 is turned on, short-circuiting the resistor R1. Since the amplification factor of the amplifier A is increased, the detection sensitivity of the device can be raised as the result. Consequently, the invader can surely be detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crime intruder detection for detecting an intruder and issuing an alarm or intimidation to the intruder when the illegal intruder enters a predetermined warning area. It relates to the device.

[0002]

2. Description of the Related Art Such an intruder detecting device for crime prevention is started for driving an alarm function device such as lighting or blinking of a lighting lamp, sounding of an alarm buzzer or siren, or outputting a warning sound by a tape recorder or a voice synthesizer. It is used as a switch, and in recent years, a passive infrared type is often used. That is, the infrared energy incident from a predetermined detection area set using an optical system at a place to be watched is constantly monitored using the optical system, and when a human body enters the detection area, infrared rays are transmitted through the optical system. Since the amount of infrared energy incident on the detection element changes by the difference between the amount emitted by the human body and the amount emitted from the background of the detection area, the human body, that is, an intruder is detected from this change in infrared energy amount.

[0003]

By the way, if this type of security intruder detection device malfunctions, it will not only cause a great deal of trouble to the neighborhood, but it will also hurt visitors and family members in good faith. It is inconvenient. Therefore, extremely high detection accuracy is required so that an intruder can be detected reliably and the occurrence of malfunction can be avoided as much as possible. Therefore, the detection sensitivity of the human body is automatically corrected by automatically changing the amplification degree and frequency characteristics of the amplification circuit or the detection level of the level detection circuit according to the temperature change of the background serving as the detection area, and the radiation from the background is radiated. An apparatus has been devised which prevents the malfunction by keeping the signal level and the detection sensitivity of a human body relatively substantially constant regardless of the fluctuation of the infrared energy amount.

However, in any of these devices, the detection sensitivity is automatically corrected with an emphasis on preventing the occurrence of a malfunction in which an intruder detection signal is erroneously output due to a background temperature change due to various conditions in the detection area. When set to, there is a problem that the human body's detection performance deteriorates and it is not possible to reliably detect the important intruder.On the contrary, when the automatic correction of detection sensitivity is set with emphasis on accurate detection of intruders. The detection sensitivity tends to be high, and there is a high probability that an intruder detection signal will be erroneously output due to temperature changes in the background of the detection area, and the most serious malfunction of the intruder detection device can be reliably prevented. There is a problem that cannot be solved.

Therefore, the present invention provides a crime-preventing intruder detecting device capable of accurately detecting an intruder while surely preventing a malfunction of outputting a detection signal even when there is no intruder in the detection area. This is a technical issue.

[0006]

According to the present invention, as a technical means for achieving the above-mentioned object, a crime prevention intruder detection device is constructed as follows. That is, an optical system that condenses the infrared light flux emitted from a predetermined detection area, an infrared detection element that converts the infrared light flux incident from this optical system into an electric signal according to the amount of fluctuation, and this infrared detection element An intrusion for crime prevention, which includes an amplification circuit for amplifying an output signal and a level detection circuit for outputting an intruder detection signal to drive an alarm signal generation circuit when the output amplification signal of the amplification circuit exceeds a predetermined level In the person detecting device, the sound sensing means is installed in the same closed space in which the detection area exists, and which converts a low frequency sound wave less than the audible range generated in the same space into an electric signal, and the sound sensing means. It is characterized by comprising sensitivity changing means for increasing the detection sensitivity of an intruder when the output signal level exceeds a predetermined value.

Further, the sensitivity varying means is an amplification degree varying circuit for increasing the amplification degree of the amplifying circuit when the output signal level of the sound sensing means exceeds a predetermined value, or the output signal level of the sound sensing means. When the value exceeds a predetermined value, the detection level variable circuit that lowers the detection level of the level detection circuit, or when the output signal level of the sound sensing unit exceeds a predetermined value, the detection sensitivity of the frequency characteristic of the amplifier circuit becomes It is preferable to use any one of the frequency variable circuits that are variable so as to be higher.

Further, an optical system for condensing the infrared light flux emitted from a predetermined detection area, an infrared detection element for converting the infrared light flux incident from the optical system into an electric signal according to the variation amount thereof, and this infrared light An amplification circuit that amplifies the output signal of the detection element, a level detection circuit that outputs an intruder detection pulse signal when the output amplification signal of this amplification circuit exceeds a predetermined level, and a continuous output from this level detection circuit In a crime prevention intruder detection device equipped with a pulse count circuit that counts the pulse signals that are generated and outputs a trigger signal that drives an alarm signal generation circuit when the count number reaches a set count number, aim at the detection area. A sound-sensing device that is installed and converts low-frequency sound waves below the audible range into an electrical signal, and when the signal level by this sound-sensing device exceeds a predetermined value Can be configured to respect the pulse counting circuit is provided a variable set count changing means so as to reduce the set number counter for outputting the trigger signal.

Furthermore, an optical system for condensing the infrared light flux emitted from a predetermined detection area, an infrared detection element for converting the infrared light flux incident from this optical system into an electric signal according to the fluctuation amount, and Equipped with an amplifier circuit that amplifies the output signal of the infrared detection element, and a level detection circuit that outputs an intruder detection signal and drives the alarm signal generation circuit when the output amplified signal of the amplifier circuit exceeds a predetermined level In the crime prevention intruder detection device, the optical system is configured by a plurality of condenser lenses that set different detection areas, and in a normal state, a specific one of the condenser lenses is in an opaque state. A system changing means, a sound-sensing means installed in the same closed space in which the detection area exists, for converting a low-frequency sound wave below the audible range generated in the same closed space into an electric signal, May be configured to output signal level of the unit is provided with an optical system control means for switching all of the converging lens in condensed state by the optical system changing means when a predetermined value or more.

[0010]

In general, when an intruder illegally invades, a sound of opening and closing windows and doors, a sound of breaking glass, and some other low-frequency sound caused by an intruder. This low frequency sound wave below the audible range is converted into an electric signal by a sound sensing means such as a microphone. When the output signal level of the sound sensing means is equal to or higher than a predetermined value, the sensitivity varying means automatically varies so as to increase the detection sensitivity of the human body. Therefore, when the output signal level of the sound sensing means is below a predetermined value and the probability that an intruder does not exist in the detection area is extremely high,
Since the detection sensitivity is relatively low, the intruder detection signal will not be erroneously output due to a change in the background temperature of the detection area or passage of a small animal such as a dog or cat through the detection area. On the other hand, when the output signal level of the sound sensing means becomes a predetermined value or more and the probability that an intruder illegally enters the detection area becomes extremely high, the detection sensitivity is automatically changed so as to increase. This intruder can be reliably detected. Moreover, because the low-frequency range below the audible range is used, the generation of low-frequency sound waves is the same as the sound generated by the illegal entry into a room such as opening and closing windows and doors and breaking glass, doors and walls, etc. Limited Therefore, the probability that the sound sensing means malfunctions due to other sounds is extremely low.

Further, in an apparatus for varying the set count number for outputting a trigger signal to the signal count circuit when the output signal level of the sound sensing means exceeds a predetermined value, for example, a sound sensing If the output signal level of the means is below a predetermined value and the probability that an intruder does not exist in the detection area is extremely high, if the count number is set to four, the intruder detection pulse signal is erroneously output four times in succession. Since it is very unlikely that the alarm signal is generated, the pulse counting circuit does not erroneously output the trigger signal for driving the alarm signal generating circuit. On the other hand, when the output signal level of the sound sensing means exceeds a predetermined value and the probability that an intruder illegally enters the detection area becomes extremely high, the set count number changing means sets the set count number of the pulse count circuit to, for example, 1 If the switch is switched to one time, the trigger signal is output by inputting one intruder detection pulse signal, so that the intruder can be reliably detected.

Further, in an apparatus for bringing all the plurality of condenser lenses into a state in which the output signal level of the sound sensing means exceeds a predetermined value, small animals such as dogs and cats frequently come and go. By setting the condensing lens, which is a place that is likely to pass through when an intruder enters, as a detection area, it is kept in a light-shielding state by the optical system changing means during normal operation, so that malfunction due to small animals etc. It can be surely prevented. On the other hand, when the output signal level of the sound sensing means exceeds a predetermined value and the probability that an intruder illegally enters the detection area becomes extremely high, the optical system control means causes the optical system changing means to collect all the light beams. By switching the lens so that it is in the light-collecting state, the detection area becomes wider, and the intruder can be reliably detected.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the drawings. In FIG. 1 showing a block configuration of an embodiment of the present invention, an infrared light flux emitted from a predetermined detection area is condensed by an optical system (1) and enters an infrared detection element (2). The infrared detecting element (2) is a pyroelectric detector, a thermistor / bolometer, a thermoelectric stack, etc., and converts the infrared energy amount incident through the optical system (1) into an electric signal proportional to the fluctuation amount. This electric signal is amplified by the amplifier circuit (3), and the signal strength of this amplified signal, that is, the amount of fluctuation of the infrared light flux is constantly monitored by the level detection circuit (4) composed of a comparator, and the level detection circuit (4) An intruder detection signal is output when a change exceeding a predetermined detection level is detected. The alarm signal generation circuit (5) is driven by the intruder detection signal and outputs an operation signal to an alarm function device such as a lighting lamp, a buzzer, a siren, or a warning sound generator.

In contrast to the basic structure of the passive infrared type intruder detection device as described above, an amplification circuit (3) is provided with an amplification circuit (3) in which the amplification level is varied to vary the detection sensitivity for an intruder detection signal. A circuit (6) is connected, and the amplification degree variable circuit (6) is controlled by a sound sensing circuit composed of a microphone (7), an amplifier (8) and a comparator (9). These configurations will be described together with the operation description below.

The microphone (7) is installed so as to detect a sound below the audible range generated in the same closed space where the detection area set by the optical system (1) exists.
The sound wave emitted from this detection area is converted into an electric signal.
The output electric signal of this microphone (7) is an amplifier (8)
After being amplified by, the level of this amplified signal is compared with the set reference level in the comparator (9), and when it becomes equal to or higher than the reference level, the comparator (9) outputs a high level signal.

The reference level of the comparator (9) is set to be higher than the average level of the amplified signal obtained by amplifying the electric signal output from the microphone (7) in the normal state. Therefore, normally, the output of the comparator (9) is at a low level, the transistor (Q) of the amplification degree variable circuit (6) is in the off state, and the combined resistance of the two series resistors (R1) and (R2) is The amplification degree of the amplifier (A) of the amplifier circuit (3) is set by the ratio between the value and the resistance value of the resistor (R3). At this time, the amplification level is set to a relatively low detection sensitivity so that the intruder detection signal will not be erroneously output due to changes in the background temperature of the detection area and passage of small animals such as dogs and cats through the detection area. It is set in advance. As described above, the detection sensitivity is relatively low during normal times when the output signal level of the microphone (7) is below a predetermined value and the probability that an intruder does not exist in the detection area is extremely high. The probability of erroneously outputting the intruder detection signal due to the cause is extremely low.

When an intruder illegally invades,
The sound of opening and closing windows and doors, the sound of breaking glass, and other low-frequency sounds are generally generated by intruders.
Since the microphone (7) converts the low frequency sound wave below the audible range into an electric signal, the amplified signal from the amplifier (8) becomes equal to or higher than the reference level of the comparator (9). A high level signal is output, the transistor (Q) of the amplification variable circuit (6) is turned on, and the resistor (R1) is short-circuited. Therefore, the amplification degree of the amplifier (A) of the amplifier circuit (3) is equal to the resistance value of the resistor (R2) and the resistance (R).
The detection sensitivity of the device is increased as a result because the ratio becomes larger according to the ratio with the resistance value of 3). In this way, when the output signal level of the microphone (7) becomes equal to or higher than a predetermined value and the probability that an intruder illegally enters the detection area becomes extremely high, the detection sensitivity becomes high, so that the intruder is detected. Can be reliably detected.

As the sensitivity varying means, in addition to the amplification degree varying circuit (6) for varying the amplification degree of the amplification circuit (3) described above, the output signal level of the microphone (7) becomes a predetermined value or more. In this configuration, the detection level of the level detection circuit (4) is lowered to increase the detection sensitivity, or the frequency characteristic of the amplification circuit (3) is detected when the output signal level of the microphone (7) exceeds a predetermined value. The same effect as that of the above-described embodiment can be obtained even when the configuration is changed so that the value becomes higher.

FIG. 2 shows a block configuration of another embodiment of the present invention. In FIG. 2, the same or equivalent parts as in FIG. 1 are designated by the same reference numerals. The difference from FIG. 1 is that a pulse signal as an intruder detection signal continuously output from the level detection circuit (4) between the level detection circuit (4) and the alarm signal generation circuit (5). The pulse count circuit (10) that counts the number of pulses and outputs a trigger signal for driving the alarm signal generation circuit (5) when the count number reaches the set count number is inserted and connected to prevent malfunction. In the detection device, a setting for outputting the trigger signal to the pulse count circuit (10) by the high level signal output from the comparator (9) when the output signal level of the microphone (7) becomes a predetermined value or more. This is to provide a configuration in which a set count number varying function for varying the count number is added.

Therefore, in a normal time when the output signal level of the microphone (7) is below a predetermined value and the probability that an intruder does not exist in the detection area is extremely high, the pulse count circuit (10) sets the count number to, for example, four times. If set, it is extremely unlikely that the pulse signal for intruder detection is erroneously output four times in succession. Therefore, the pulse count circuit (10) erroneously outputs the trigger signal to the alarm signal generation circuit (5). There is no. On the other hand, when the output signal level of the microphone (7) becomes equal to or higher than a predetermined value and the probability that an intruder illegally enters the detection area becomes extremely high, the pulse count circuit is output by the output high level signal of the comparator (9). If the set count number in (10) is switched to, for example, once, the pulse count circuit (1) is output when the intruder detection pulse signal is output once from the level detection circuit (4).
Since the trigger signal is output from 0), an intruder can be detected reliably.

FIG. 3 shows a block configuration of still another embodiment of the present invention, in which the same or equivalent parts as those in FIGS. 1 and 2 are designated by the same reference numerals. And FIG.
2 is different from FIG. 2 in that three condenser lenses (1a) to (1c) that set different detection areas close to each other.
The optical system is constituted by the above, and the specific condenser lenses (1b) and (1c) normally shown by the one-dot chain line are made light-shielded by means such as an optical shutter, and the condenser lens (1 shown by the solid line
An optical system control means (11) is provided for making only a) a condensing state, and the microphone (7), the amplifier (8) and the comparator (9) are controlled by switching the optical system change means (11). Used as a means, when the output signal level of the microphone (7) exceeds a predetermined value, the optical system changing means (11) shields the condenser lenses (1b), (1).
Only the configuration in which c) is switched to the light collecting state.

Therefore, for example, a place where small animals such as dogs and cats frequently come and go, and is likely to pass when an intruder comes in, is normally shielded from the condenser lenses (1b), ( By setting the detection area according to 1c), a malfunction due to a small animal or the like can be reliably prevented. On the other hand, when the output signal level of the microphone (7) is equal to or higher than a predetermined value and the probability that an intruder illegally enters the detection area becomes extremely high, the optical change is changed by the output high level signal of the comparator (9). By activating the means (11) and switching the condenser lenses (1b) and (1c) to the converging state, the detection area becomes wider and the intruder can be detected reliably.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but may include various modifications without departing from the scope of the claims. For example, the detection sensitivity may be increased by the output from the sound sensing means and at the same time a timer or other time measuring means may be operated, and an automatic return function for returning the detection sensitivity to the original level after a lapse of a predetermined time may be added. As the means for determining the output of the sound sensing means, the output signal waveforms may be compared in addition to the level of the embodiment.

[0024]

As described above, according to the security intruder detection device of the present invention, when an intruder illegally invades, the sound of opening and closing windows and doors, the sound of breaking glass, and other intrusions. Only when the low-frequency sound wave below the audible range generated by the action is converted into an electric signal by the sound-sensing means, and the output signal level of this sound-sensing means becomes a predetermined value or more,
Automatically correct to increase the human body detection sensitivity, or change the number of set counts for outputting the trigger signal to the signal counting circuit that counts the intruder detection pulse signal to be variable, or to collect the light-shielded state under normal conditions. When the output signal level of the sound-sensing means is below a predetermined value and the probability that an intruder is not in the detection area is extremely high, since the configuration is such that all the optical lenses can be focused. , The detection sensitivity is relatively low, or the trigger signal is not output unless the intruder detection pulse signal is continuously output many times, or the detection area is narrow, so the background temperature change of the detection area, dogs, cats, etc. The detection signal will not be erroneously output due to passage of the small animal in the detection area.

On the other hand, when the output signal level of the sound-sensing means exceeds a predetermined value and the probability that an intruder illegally enters the detection area becomes extremely high, the detection sensitivity becomes high or the intruder detection pulse is detected. Since the trigger signal is output by outputting the signal a few times or the detection area is widened, the intruder can be reliably detected.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a block diagram showing another embodiment of the present invention.

FIG. 3 is a block diagram of still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical system 1a-1c Condensing lens (optical system) 2 Infrared detecting element 3 Amplifying circuit 4 Level detecting circuit 5 Alarm signal generating circuit 6 Amplification degree varying circuit 7 Microphone (sound sensing means) 9 Comparator 10 Pulse counting circuit 11 Optical System change means

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[Procedure amendment]

[Submission date] July 15, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

According to the present invention, as a technical means for achieving the above-mentioned object, a crime prevention intruder detection device is constructed as follows. That is, an optical system for condensing the infrared light flux emitted from a predetermined detection area, an infrared detection element for converting the infrared light flux incident from this optical system into an electric signal according to the amount of fluctuation, and this infrared detection element An intrusion for crime prevention, which includes an amplification circuit that amplifies an output signal and a level detection circuit that outputs an intruder detection signal and drives an alarm signal generation circuit when the output amplification signal of this amplification circuit exceeds a predetermined level In the person detecting device, the sound sensing means is installed in the same closed space in which the detection area is present, and which converts a low frequency sound wave less than the audible range generated in the same space into an electric signal, and the sound sensing means. It is characterized by including sensitivity changing means for increasing the detection sensitivity of an intruder when the output signal level exceeds a predetermined value. In addition, in the present invention, the above-mentioned "low frequency below the audible range"
The term "low frequency sound" or fluctuation in atmospheric pressure that cannot be recognized by the human ear.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

[0010]

In general, when an intruder illegally invades, a sound of opening and closing windows and doors, a sound of breaking glass, and other low-frequency sound or fluctuation of atmospheric pressure due to the intruding action are generated. This low frequency sound wave below the audible range is converted into an electric signal by a sound sensing means such as a microphone. When the output signal level of the sound sensing means is equal to or higher than a predetermined value, the sensitivity varying means automatically varies so as to increase the detection sensitivity of the human body. Therefore, when the output signal level of the sound sensing means is below a predetermined value and the probability that an intruder does not exist in the detection area is extremely high, the detection sensitivity is relatively low, so the temperature of the background of the detection area is low. The intruder detection signal is not erroneously output due to a change or passage of a small animal such as a dog or cat within the detection area. On the other hand, when the output signal level of the sound-sensing means is equal to or higher than a predetermined value and the probability that an intruder illegally enters the detection area becomes extremely high, the detection sensitivity is automatically changed to be high. This intruder can be reliably detected. Moreover, since the low frequency range below the audible range is used,
The generation of low-frequency sound waves is limited to the sound generated by illegal entry into a room such as opening and closing windows and doors and breaking glass, doors and walls. Therefore, the probability that the sound sensing means in the previous period malfunctions due to other sounds is extremely low.

Claims (4)

[Claims] 1. An optical system for condensing an infrared light flux emitted from a predetermined detection area, an infrared light detecting element for converting the infrared light flux incident from the optical system into an electric signal according to the variation amount, and the infrared light. An amplification circuit that amplifies the output signal of the detection element, and a level detection circuit that outputs an intruder detection signal and drives the alarm signal generation circuit when the output amplification signal of the amplification circuit exceeds a predetermined level In the crime prevention intruder detection device, a sound-sensing means installed in the same closed space in which the detection area exists, for converting a low-frequency sound wave below the audible range generated in the same closed space into an electric signal,
An indoor crime prevention intruder detection device comprising: sensitivity changing means for increasing the detection sensitivity of an intruder when the output signal level of the sound sensing means exceeds a predetermined value. 2. An amplification degree variable circuit for increasing the amplification degree of the amplification circuit when the output signal level of the sound sensing means exceeds a predetermined value, or an output signal level of the sound sensing means. When the value exceeds a predetermined value, the detection level variable circuit that lowers the detection level of the level detection circuit, or when the output signal level of the sound sensing unit exceeds a predetermined value, the detection sensitivity of the frequency characteristic of the amplifier circuit becomes The crime prevention intruder detection device for indoor use according to claim 1, wherein the intruder detection device for indoor use is configured by any one of a frequency variable circuit that is variable so as to be higher. 3. An optical system for condensing an infrared light flux emitted from a predetermined detection area, an infrared detection element for converting the infrared light flux incident from the optical system into an electric signal according to the variation amount, and the infrared light. An amplification circuit that amplifies the output signal of the detection element, a level detection circuit that outputs an intruder detection pulse signal when the output amplification signal of this amplification circuit exceeds a predetermined level, and a continuous output from this level detection circuit In a crime prevention intruder detection device equipped with a pulse count circuit that counts the pulse signals that are generated and outputs a trigger signal that drives an alarm signal generation circuit when the count number reaches a set count number, aim at the detection area. A sound-sensing means which is installed and converts low-frequency sound waves below the audible range into an electric signal, and the pulse sensor when the signal level of the sound-sensing means exceeds a predetermined value. An indoor security intruder detection device, characterized in that a setting count number changing means for changing the setting count number for outputting the trigger signal to the count circuit is provided. 4. An optical system for condensing an infrared light flux emitted from a predetermined detection area, an infrared light detecting element for converting the infrared light flux incident from this optical system into an electric signal according to its variation amount, and this infrared light. An amplification circuit that amplifies the output signal of the detection element, and a level detection circuit that outputs an intruder detection signal and drives the alarm signal generation circuit when the output amplification signal of the amplification circuit exceeds a predetermined level In the security intruder detection device, the optical system is composed of a plurality of condenser lenses for setting different detection areas,
An optical system changing unit that normally turns a specific one of the condenser lenses into a light-shielding state, and a sound-sensing unit that is installed toward the detection area and converts a low-frequency sound wave below the audible range into an electric signal. An optical system control means for switching all the condenser lenses to a condensing state by the optical system changing means when the output signal level of the sound sensing means exceeds a predetermined value. Security intruder detection device.