JPH0342536Y2 - - Google Patents

Description

[Detailed description of the invention] Field of the invention This invention relates to an alarm device installed in a house, etc., and in particular, a system that detects when a person tries to break into the house through the entrance of the house and emits an alarm sound. This relates to alarm devices.

Background and purpose of the invention Houses equipped with intercoms and alarm bells are becoming more common as a crime prevention measure. These conventional intercoms, alarm bells, and the like are effective in dealing with persistent door-to-door salespeople when family members are in the house, or in getting suspicious people wandering around the house to leave. However, when the householder is away, these intercoms and alarm bells usually do not work, or even if the alarm bells do work, there is a problem that they do not work until the door of the house is broken. Ta.

In addition, a non-contact human body detector such as a photodetector is placed at the entrance, and when a human body is detected, an alarm system emits daily life sounds to make it appear as if the householder is not home. (Utility Model Application Publication No. 55-117095), but with this, there is a possibility that visitors may think that someone from the house is present and make them wait for an indefinite period of time. Furthermore, there is a method of attaching a contact-based human body detector to a doorknob, which detects the presence of a human body and issues a warning, but this method, which detects contact with the knob, has the problem that the detection range of a human body is too narrow. In view of the above background, the idea was developed to automatically sound an alarm before the door is broken, when a suspicious person approaches the front door or back door of a house, or tries to forcefully enter the house through the front door. The purpose is to provide an alarm device that will emit a warning signal.

Outline of the invention Simply put, this invention has the following structure. In other words, there are contact detectors that detect when an object touches the outside handle of an entrance door, etc., and infrared detectors that detect the presence of a person within a predetermined range in front of the door. will be established. When a detection output is received from any of the detectors, it is determined whether the output remains for a predetermined period of time or more, and if the output remains for a predetermined period of time or more, control is performed to output an alarm signal. This determination and control is performed, for example, by the CPU. The alarm signal is then output as an alarm sound from a sound output means such as an intercom installed near the door.

Hereinafter, embodiments of this invention will be described in detail with reference to the drawings.

Embodiment of the invention FIG. 1 is a block diagram of an embodiment of the invention. This embodiment is divided into a terminal device 1 and a center device 2, and a communication line 3 is connected between them.
connected with. The terminal device 1 is provided, for example, near the entrance door of a house, and the center device 2 is provided, for example, at a predetermined location within the house. Terminal device 1
is equipped with an infrared detector 11, a contact detector 12, and an intercom handset 13, which are connected to the communication line 3 via an input/output interface 14.

The center device 2 connected to the other side of this communication line includes a control section 21 and an intercom base unit 22.

FIG. 2 is a detailed block diagram of this control section 21. The control unit 21 is a CPU 21 that is the center of control.
1, and ROM2 that stores the CPU operating program.
12, a RAM 213 in which various calculations and control data can be written and read, and an audio synthesis section 214 used to synthesize an alarm audio signal. CPU2
The output of 11 is connected to an external circuit such as a communication line 3 via an input/output interface 215. Note that a D/A converter 216 is provided for converting a digital signal into an analog signal as necessary.

FIG. 3 is a diagram showing an example of the vicinity of the entrance door of a house to which the terminal device 1 is installed. On both sides of the front of the entrance door 4, an infrared detector 11 consisting of a pair of cylindrical light projecting section 5 and a cylindrical light receiving section 5' is provided. Infrared rays emitted from the light projecting section 5 are directed to the light receiving section 5' via the light projecting windows 51 and 52.
The light receiving section 5' receives infrared rays through light receiving windows 51' and 52'. This pair of light emitting/receiving parts 5,
When the infrared rays between 5' are blocked, the presence of a person is detected.

Next, the handle 6 of the entrance door 4 is usually made of metal, and this handle 6 constitutes the sensor section of the contact detector 12 (FIG. 1). The contact detector including the handle 6 and the above-mentioned infrared detector 11 are connected to the entrance door 4.
It is connected to an intercom handset 13 attached to the side.

Figure 4 shows a contact detector 1 with a handle 6 as a sensor part.
2 is a diagram showing an example of a circuit configuration of No. 2. FIG. Also, the fifth
This figure is a timing diagram showing changes in voltage levels at points A, B, and the output terminal of the circuit shown in FIG. 4.

With reference to FIGS. 4 and 5, contact detector 1
An example of the circuit No. 2 will be briefly explained. Fourth
The circuit shown in the figure is a circuit that takes advantage of the high input impedance of transistors 41 and 42. Here, 41 is a P-channel FET, and 42 is an N-channel FET. Therefore, when there is no object in contact with the handle 6, the potential at point A is "H" (high level), the transistor 41 is off, and the transistor 42 is off.
is turned on. At this time, if the off-resistance value of the transistor 41>>the value of the resistor 43, the point B becomes "L (low level)" and the output becomes "H".

Next, when the handle 6 is touched by a human hand, the hum voltage induced thereby turns the transistors 41 and 42 on and off alternately. When the transistor 41 is turned on and the transistor 42 is turned off, the capacitor 44 is rapidly charged through the on-resistance of the transistor 41, and the potential at point B becomes V _DD
rises to Conversely, when the transistor 41 is turned off and the transistor 42 is turned on, the capacitor 44 is gradually discharged with a time constant determined by the value of the resistor 43. By setting this time constant appropriately, as shown in B in Fig. 5, a saw-shaped "H" is obtained at point B only during the period when there is an object in contact with the handle 6, and the output during that period is "L". It can be done.

Note that the circuit of the contact detector 12 is, instead of this,
For example, it may be a circuit described in the publication "Production of Peripheral Devices" (ASCII Publishing Co., Ltd., p. 245).

FIG. 6 is a flowchart illustrating the control of the embodiment of the invention shown in FIGS. 1 to 5. 6th
The control operation of this embodiment will be explained with reference to the drawings.

When the operation starts, the control unit 21 determines the presence or absence of infrared detection output and the presence or absence of contact detection output. That is, it is determined whether or not the infrared rays between the infrared detectors 11 provided in front of the entrance door 4 shown in FIG. 3 are blocked. It is also determined whether a hand or the like is in contact with the handle 6 of the entrance door 4 (steps S1, S2).

Normally, when there is no person or anything near the entrance door, neither the infrared detection output nor the contact detection output is output, so the control operation is performed in step S1 →
Proceed from S2 to S11.

At step S11, the counter S is incremented by +1. Counter S is CPU211 and RAM213
(See FIG. 2), and is incremented when there is neither infrared detection output nor contact detection output.

In the next step S12, the CPU 211 sets the value of the counter S to the RAM 213 for a predetermined number of times.
Compare with S ₀ . Then, if the value of the counter S has not reached the set number of times _S0 , the processing of steps S1 to S12 is repeated once again.

At step S12, the value of counter S reaches the set number of times S ₀
If it reaches, counter T (described later), counter S
Then, a flag F (described later) is reset (step S13), and the process returns to the beginning.

If the infrared detection output or contact detection output is output in step S1 or step S2, proceed to step S3 and increment the counter T by 1.
Increment. The counter T, like the counter S described above, is composed of a CPU 211 and a RAM 213. This counter T is a counter that is incremented when any detection output is output.

In the next step S4, the CPU 211 determines whether the value of the counter T has reached a predetermined number of times _T0 . If the value of the counter T has not reached _T0 , the processing from step S1 is repeated.

When the value of the counter T reaches the set number of times _T0 , the state of the flag F is checked in step S5.
In this case, flag F is not set, so
Proceed to step S8 and output the first sound.
That is, the control unit 21 (see FIG. 1) sends the first audio output signal to the terminal device 1 via the communication line 3.
give to In response, the intercom handset 13 of the terminal device 1 outputs the first warning sound, image and sound.
This alarm sound can be, for example, ``Do you need anything? This device is linked to a security company's device.I'm out of town right now, so if you're in a hurry, please call number XXX~○○○○. Please contact us.'' Then, the CPU 211 sets the flag F (step S9), and resets the counter T in step S10. Then, the process from step S1 is repeated.

If the infrared detection output or contact detection output continues to be output, the value of the counter T is similarly incremented, and if the predetermined set number of times _T0 is reached, it is determined in step S5 that the flag is set. Then, in step S6, the second audio is output. The second warning sound is, for example, "If you are not on duty and stay longer, the security guard may come and cause you trouble. Please be careful." After outputting the second voice, in step S7, the flag F and counter T are reset, and the process returns to the initial state.

In the embodiment described above, the output of the alarm sound is
Since it has a two-stage configuration in which two types of audio are output, the first and second, it is possible to make the system more effective in preventing crime by making the output audio of each type different. However, the configuration may be such that the warning sound is output only once instead of having a two-stage configuration for outputting the warning sound.

Furthermore, in this embodiment, the alarm device is connected to the terminal device 1.
Although the terminal device and the center device 2 are divided into the terminal device and the center device 2, and are connected by the communication line 3, the terminal device and the center device can be combined into one device and installed near the entrance door, for example.

Further, in this embodiment, the terminal device 1 is installed near the entrance door, and the center device 2 is installed inside a house, but the center device 2 may be installed at a security company, for example.

Furthermore, if a house has multiple entrances and exits, the number of terminal devices can be increased accordingly.

It should be noted that in this embodiment, the alarm device has the functions of an intercom base unit and an intercom slave unit, so it should be noted that it can also be used as a normal intercom when family members are present.

Effects of the invention As described above, according to this invention, a person attempting to enter a house is detected based on the outputs of the two detection means, so if there is a suspicious person, the person can be detected. Can be detected reliably. In addition, the detection signal is output before the door of a house is opened, closed, or destroyed, and an audio warning is issued thereby, making it possible to prevent crime and also prevent the destruction of structures (doors, etc.). I can do it. Furthermore, since the alarm is issued at least twice, an object that does not leave after the first alarm can be regarded as a suspicious person.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of this invention. FIG. 2 is a detailed block diagram of the control section 21. FIG. 3 is a concrete layout diagram of the terminal device of this invention. FIG. 4 shows an example of a circuit configuration of a contact detector. FIG. 5 is a timing diagram showing voltage level changes in the circuit of FIG. 4. FIG. 6 is a flow diagram for explaining the control operation of this invention. In the figure, 1 is a terminal device, 2 is a center device,
3 is a communication line, 4 is an entrance door, 6 is a handle, 11
12 is an infrared detector, 12 is a contact detector, 13 is an intercom slave unit, 21 is a control unit, 22 is an interphone base unit, 51 and 52 are light projecting windows, and 51' and 52' are light receiving windows.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A first detection means for detecting that a human body has come into contact with a handle on the outside of the door; a second detection means for detecting by electromagnetic waves; an audio output means provided near the door; and a second detection means for detecting that the output of the first detection means or the output of the second detection means has been present for at least a predetermined period of time or more. Discrimination means for discriminating more than once;
and an alarm device comprising a control means for providing an alarm audio output signal with a different content to the audio output means every at least two or more outputs of the discrimination means. (2) The discrimination means is configured to detect a first detection means determined in advance by the output of the first detection means.
a first determining unit that determines whether the output of the second detecting means is longer than a predetermined time;
2. The alarm device according to claim 1, further comprising: a second determining unit that determines that the period of time has exceeded a second certain period of time different from the certain period of time. (3) The second detection means includes a light emitter that emits infrared light and a light receiver that receives the emitted infrared light, and when the infrared light applied from the light emitter to the light receiver is blocked, The alarm device according to claim 1 or 2, which is an infrared detector for detecting a person. (4) The alarm device according to any one of claims 1 to 3, wherein the control means includes a voice synthesis section, and a desired voice signal is synthesized by the voice synthesis section. . (5) Consisting of a center device and a terminal device, the discrimination means and the control means are provided in the center device, and the audio output device, the first detection device, and the second detection device are provided in the terminal device. , Utility model registration claim No. 1, in which the center device and the terminal device are connected by a communication medium.
The alarm device according to any one of Items 1 to 4. (6) The alarm device according to claim 5, wherein a plurality of terminal devices are connected to the center device. (7) In the utility model, the center device further includes an audio input/output unit, the terminal device further includes an audio input unit, and the center device and the terminal device have an intercom function via the communication line. An alarm device according to registered claim 5 or 6. (8) The center device is installed at a security company, and the terminal device is installed at the entrance (entrance, back door, etc.) of each customer's home registered with the security company. The alarm device according to any one of Items 5 to 7. (9) Any one of claims 5 to 7 of the scope of utility model registration claims, wherein the center device is installed inside a house, and the terminal device is installed at an entrance (entrance, back door, etc.) to the house. Alarm device described in Crab.