JPH0142223Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The present invention is a visitor alarm that uses chime or other sounding means indoors to notify the user of the arrival of a visitor at the front door or back door. The present invention relates to a visitor alarm equipped with a crime prevention alarm function that can also be used as a crime prevention alarm to detect and notify an intruder.

<Prior art> This type of conventional general visitor alarm is installed at a desired location to be monitored, such as an outdoor entrance or back door, and detects the presence or absence of a visitor mainly in a non-contact manner. and an alarm section that is installed indoors and sounds a sounding device such as a chime when a visitor arrives. The detection unit includes an object detection circuit that detects the entry of a moving object, that is, a visitor, into a predetermined detection area, and when this object detection circuit detects a visitor, it sends an alarm signal to the alarm unit by wireless or wire. It consists of a transmitting circuit and a transmitting circuit.

On the other hand, the notification section includes a receiving circuit that receives the notification signal, and a notification circuit that operates the sounding body based on the received output of the receiving circuit.

<Problem to be solved by the invention> By the way, the visitor alarm device detects and notifies a well-intentioned visitor who moves to a common sense place such as the entrance at a common sense time such as daytime hours. It is generally used for this purpose. On the other hand, at times such as late at night when visitors are not expected to arrive, or even during common sense times such as during the day, go to places where few people approach, such as behind shrubbery inside a fence. There are security alarms that detect malicious trespassers and issue a notification or alarm. This security alarm is structurally the same as the visitor alarm, and the only difference is that the alarm sound is louder than that of the visitor alarm.

Therefore, by variably adjusting the volume using the volume control circuit included in the visitor alarm's alarm circuit, and using this visitor alarm by specifying the time of day and detection area, it is possible to use the visitor alarm and crime prevention alarm. It is conceivable that it can be used for different purposes. For example, during the day, the detection unit can be installed at the entrance and used as a visitor alarm.
Moreover, at night, it can be installed inside a fence and used as a security alarm.

However, considering the original purpose of using the visitor alarm, it is sufficient to simply notify the household members indoors that there is a visitor, and furthermore, the alarm sound is not too loud from the living room or kitchen environment where the alarm unit is mainly installed. In many cases, it is preferable that the alarm sound is not loud, so in such situations, the alarm sound is usually lowered, but when used as a security alarm, it is necessary to increase the volume by operating the volume control circuit. If this is not the case, an unforeseen situation may arise in which a trespasser is detected by the object detection circuit but is not recognized by the householder.

Therefore, in addition to an acoustic circuit for notifying visitors whose volume can be adjusted using a volume control circuit, it is also conceivable to provide an acoustic circuit for a crime prevention alarm that always emits a notification sound at a volume above a certain value. However, it is not practical to provide two types of acoustic circuits depending on the purpose of use because it increases cost and size.

The present invention was developed in view of these conventional problems, and while it has a structure that can be made inexpensive and compact using a single acoustic circuit, it also ensures that when used as a security alarm, it will exceed a specified level. A technical object of the present invention is to provide a visitor alarm with a crime prevention alarm function that can generate an alarm sound with a volume of .

<Means for Solving the Problems> In the present invention, as a technical means for achieving the above-mentioned problems, a visitor alarm with a security alarm function is configured as follows. In other words, the detection section includes an object detection circuit that detects the presence or absence of an object entering a predetermined detection area, and a transmission circuit that outputs an alarm signal when an object detection signal is output from the object detection circuit. , a visitor alarm comprising a receiving circuit that receives an alarm signal from the detection section, and an alarm circuit that outputs an alarm sound under the control of the reception output from the receiving circuit; The notification circuit includes a mode switching means for selecting a visitor notification mode and a crime prevention alarm mode, a volume adjustment means for adjusting the volume of the notification sound by a single acoustic circuit, and a crime prevention alarm mode is selected by the mode switching means. The present invention is characterized by comprising a volume increasing means for automatically setting the volume at a predetermined level or higher regardless of the volume set by the volume adjusting means in conjunction with the volume adjustment means.

<Function> When used as a proper visitor alarm, the visitor alarm mode is selected and set by the mode switching means, and the output volume of the acoustic circuit is arbitrarily set by operating the volume adjustment means. Next, when using it as a burglar alarm, all you have to do is switch to the burglar alarm mode using the mode switching means, and the volume increasing means automatically adjusts the output volume of the acoustic circuit by selecting the burglar alarm mode using the mode switching means. set at a predetermined level or higher. Therefore, when an illegal intruder is detected by the detection unit, even if the volume set by the volume control means at this time is low, an alarm sound of a predetermined level or higher necessary for the crime prevention alarm function is emitted and the alarm sound is emitted to alert the householder. be reliably recognized. Of course,
Since this visitor alarm with a security alarm function only includes a single acoustic circuit in the alarm circuit, there is no increase in cost or increase in the size of the device.

<Embodiment> Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

The drawing only shows the main part of one embodiment of the present invention, that is, the notification circuit of the notification section, and the other configurations are not shown because they are the same as the existing ones.
Explain briefly. An object detection circuit for a detection unit installed outdoors is, for example, an infrared ray that detects the entry of a moving object into the detection area by utilizing the fact that all objects emit far infrared rays according to their temperature at room temperature. A type moving object detection device is used, and a detection area is set in advance by an optical system on the floor of the entrance or a guarded area of shrubbery inside a fence, and the amount of infrared energy emitted from this detection area is detected by the optical system. The system collects light, receives the light with a light receiving element such as a thermoelectric stack, and constantly monitors the light.The object is detected by detecting fluctuations in the amount of infrared energy generated when a moving object enters the detection area.

Furthermore, when the object detection circuit detects a change in the amount of infrared energy and outputs an object detection signal, the transmission circuit of the detection unit transmits an alarm signal consisting of a pulse train of a preset shape wirelessly or wired for a predetermined period of time. It is now sent repeatedly.

Furthermore, the receiving circuit of the notification section determines whether the pulse train signal received from the transmitting circuit has a predetermined shape. That is, it is determined whether the signal is due to disturbance noise or the like or the alarm signal is based on an object detection signal, and when it is determined that a regular alarm signal has been received, the alarm circuit is activated.

As shown in the figure, the notification circuit is a single acoustic circuit that uses a melody generator 1, an amplifier 2, and a speaker 3 to amplify the output of the melody generator 1 with the amplifier 2 and make the speaker 3 ring. The melody generator 1 is composed of an integrated circuit, and in the embodiment, four types of melodies can be generated by a program. That is, by connecting the corresponding ones of the four types of melody output terminals M ₁ to _{M 4} and the corresponding tone color selection terminals T ₁ to _{T 4} of a tone generator (not shown) to each other, a pre-stored notification tone can be generated. You can select and set as appropriate. In this embodiment, the visitor notification mode is set by selecting three types of visitor notification sounds by each combination of three types of melody output terminals _M1 to _M3 and the corresponding tone selection terminals _T1 to _T3 . With a single melody output terminal
By combining _M4 and the corresponding tone selection terminal _T4 , it is possible to select a single security alarm notification sound and set the security alarm mode.

Further, the mode changeover switch 4 is composed of an interlocking switch that simultaneously switches the respective melody output terminals M ₁ to M ₄ and the corresponding tone color selection terminals T ₁ to _{T 4} , and the mode changeover switch 4 and the melody generator 1 and the tone generator constitute a notification sound generation circuit. The volume adjustment circuit that adjusts the volume of this notification sound is composed of a variable resistor _R1 , its adjustment switch 5, and _a resistor _R2 . The volume is adjusted according to the resistance value. Furthermore, resistor R ₂ was added to ensure that this visitor alarm always functions normally, so even if the resistance value of variable resistor R ₁ is mistakenly narrowed down to the minimum value, the volume control circuit will still function properly. This prevents the resistance value from becoming zero, thereby preventing a situation in which the volume of the notification sound becomes zero, that is, the notification sound is not output. A volume increasing resistor _R3 , which is the essential part of the present invention, is connected to the tone selection terminal _T4 .

Next, the operation of the above embodiment will be explained. For example, if the maximum resistance value of variable resistor R ₁ is 50KΩ, the resistance value of resistor R ₂ is 2.2KΩ, and the resistance value of volume increase resistor R ₃ is 47KΩ, when used as a visitor alarm, The mode changeover switch 4 selects one of the notification tones resulting from each combination of the melody output terminals M ₁ to M ₃ and the corresponding tone selection terminals T ₁ to _{T 3} to set the visitor notification mode. , the volume of the notification sound at this time can be adjusted using a variable resistor.
Determined by the resistance value of R ₁ and the resistance value of resistor R ₂ ,
By operating the volume control switch 5,
It is adjusted within the ratio range of 2.2/52.2 to 52.2/52.2.

On the other hand, when used as a crime prevention alarm, the mode changeover switch 4 selects the crime prevention alarm notification sound created by the combination of the melody output terminal M4 and the corresponding tone selection terminal T4, and sets the crime prevention alarm mode. Therefore, the volume of the notification sound at this time is determined by the respective resistance values of the variable resistor R ₁ , the resistor R ₂ and the resistor R ₃ , and can be adjusted from 49.2/97.2 to 49.2/97.2 by operating the volume control switch 5. 97.2/97.2
It is adjusted within the ratio range of That is, when the burglar alarm mode is selected, the variable resistor R ₁
Even if the resistance value is narrowed down to the minimum value, it is set so that the volume does not drop below the maximum volume of 49.2/97.2, that is, approximately half of the maximum volume.

It should be noted that the present invention is not limited only to the contents of the above description and drawings, and may include various modifications without departing from the scope of the claims. For example, as a volume increase means when set to the security alarm mode, a resistor may be directly connected without going through a volume control circuit, and the volume may be always set at the maximum volume or close to it.

<Effects of the invention> As described above, according to the visitor alarm with a crime prevention alarm function of the present invention, the visitor alarm which also functions as a crime prevention alarm by specifying the time and place of use can be used as a crime prevention alarm. When using
By simply selecting the crime prevention alarm mode using the mode switching means, the volume is automatically set to a predetermined level or higher regardless of the volume set by the volume adjustment means, so you can prevent unforeseen situations such as missing the alarm notification sound. This greatly improves reliability, which is important for security alarms. However, only a single acoustic circuit is required, and no increase in cost or size is caused.

[Brief explanation of the drawing]

The figure is a block diagram of a notification circuit which is a main part of an embodiment of the present invention. 1...melody generator, 2...amplifier, 3...
...Speaker, 4...Mode switching switch (mode switching means), _R1 ...Variable resistor (volume adjustment means),
R ₃ ... Resistor for increasing volume (volume increasing means).

Claims (1)

[Scope of utility model registration request] a detection section consisting of an object detection circuit that detects the presence or absence of an object entering a predetermined detection area; a transmission circuit that outputs an alarm signal when an object detection signal is output from the object detection circuit; A visitor alarm comprising a receiving circuit that receives an alarm signal from a detection section and an alarm circuit that outputs an alarm sound under the control of the reception output from the receiving circuit, wherein the annunciator circuit a mode switching means for selecting between a visitor notification mode and a crime prevention alarm mode; a volume control means for adjusting the volume of the notification sound by a single acoustic circuit; and when the crime prevention alarm mode is selected by the mode switching means. A visitor alarm with a crime prevention alarm function, comprising a volume increasing means for automatically setting the volume at a predetermined level or higher regardless of the volume set by the volume adjusting means.