JPH0424758B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to an alarm device that receives alarm radio signals output from a plurality of transmitter handsets and issues an alarm and display corresponding to the type of alarm radio signal.

<Background> In recent years, in light of the increasing number of crimes such as robberies and injuries, as well as fires caused by arson and misfires, it is important to keep doors and windows locked and gas mains turned off in each household. Although people are beginning to pay particular attention to the prevention of fires and other problems, it is still not possible to completely eradicate the crimes and fires. Under such circumstances, there is a strong demand for detecting the intrusion of a criminal into the home or the initial state of a fire, and providing a warning and display to the household members or outside security personnel.

<Prior art> In order to satisfy these demands, conventionally, fire transmitters have been developed that detect the occurrence of a fire at a suitable location in the home and output an alarm radio signal, and intrusion transmitters that detect an intruder and output an alarm radio signal. In addition, a so-called security system has been developed in which an alarm base unit is installed at a predetermined location in the home to receive alarm radio signals from the various transmitter units and issue alarms and displays (patent application). (See No. 56-99126, etc.). In such a security system,
It uses weak radio waves that do not require permission as stipulated by the Radio Law, and both the alarm base unit and transmitter handset are fixedly installed in the home.

However, in a home, the location of the family member is different during the day and night (for example, the family member is usually in the living room during the day, and in the bedroom at night).

Therefore, for example, if the alarm base unit is permanently installed in the living room, there is a high possibility that the alarm will not be heard at night, and conversely, if it is permanently installed in the bedroom, it will be particularly affected by outside noise during the day. This causes inconveniences such as an increased possibility that the alarm will not be heard at all. Moreover, if alarm base units are installed at multiple locations in the home in order to eliminate these inconveniences, the cost will increase.

<Purpose> The primary purpose of the present invention is to make the alarm main unit small and lightweight so that it can be transported, and to carry the alarm main unit to a place where family members are present to ensure alarm notification. The signal level input to the alarm base unit may decrease due to transportation of the unit, a drop in battery voltage of the transmitter unit, etc. Therefore, by providing the alarm base unit with a test mode function, the alarm base unit may A second object is to make it possible to determine whether or not the device operates normally and whether or not the input signal level is appropriate.

<Example> Hereinafter, the alarm device of the present invention will be described in detail with reference to the accompanying drawings showing examples.

<Structure> FIG. 1 is a simplified front view showing the alarm device of the present invention, which is composed of one alarm master unit 1 and a plurality of transmitter slave units 2, 2, . . .

In the figure, numeral 3 is a handle, 4 is a receiving antenna, 7 is a display lamp, 8 is an alarm sound generator, and 9 is a test mode selection switch.

FIG. 2 is a block diagram showing the configuration of the alarm base unit 1, in which a radio receiving circuit demodulates the high frequency signal received by the receiving antenna 4 and converts it into a code signal that can be decoded by a microcomputer 6, which will be described later. 5, a microcomputer 6 that decodes and processes the code signal, an indicator lamp 7 and an alarm sound generator 8 whose operation is controlled by the output signal of the microcomputer 6, and a sensitivity reduction circuit that reduces the sensitivity of the radio receiving circuit 5. 10, and a test mode selection signal generation circuit 11 that applies a test mode selection signal to the microcomputer 6.

The test mode selection switch 9 is composed of a two-circuit push switch, and one circuit 9' controls the sensitivity reduction circuit 10 on and off.
The other circuit 9'' controls the test mode selection signal generation circuit 11 on and off.

On the other hand, the transmitter unit 2 uses a small battery such as a dry cell battery as a power source and outputs weak radio waves that do not require a license application as stipulated by the Radio Law. When the occurrence of an abnormal situation such as an intrusion is detected, each transmitter handset 2 is loaded with an assigned code and weak radio waves are transmitted to the receiver base 1.

<Function> The function of the alarm device having the above configuration is as follows.

Both circuits of test mode selection switch 9
If it is set to OFF and the transmitter handsets 2, 2, etc. are enabled to output weak radio waves, the sensitivity reduction circuit 10 and the test mode selection signal generation circuit 11 are both inactive, so the sensitivity of the radio reception circuit 5 is set to normal. The receiving sensitivity is maintained, and the alarm base unit 1 maintains the alert mode.
In this alert mode, although it is not shown in the flowchart of Fig. 3, the presence or absence of an output signal from the radio receiving circuit 5 is determined, and if there is an output signal, the type of code carried on the weak radio wave is determined. determine,
By driving the display lamp 7 and alarm sound generator 8 in accordance with the type of code, it is possible to notify family members of the occurrence of an abnormal situation and its type.

When the alarm main unit 1 and the transmitter handsets 2, 2... are first installed or when the alarm main unit 1 is moved to a different location, the weak radio wave output from the transmitter handsets 2, 2, etc. can be reliably received and deciphered. It is necessary to check whether this is possible and whether the display lamp 7 and alarm sound generator 8 of the alarm base unit 1 operate normally.

In such a case, both circuits of the test mode selection switch 9 may be turned on, and the sensitivity reduction circuit 10 will operate to reduce the signal level input to the alarm base unit 1 for some reason (for example, the transmitter The receiving sensitivity of the wireless receiving circuit 5 is reduced by an amount (for example, 15 dB) that takes into account the margin that may be reduced due to power supply voltage fluctuations of the device 2, ambient temperature fluctuations, etc.), and the test mode selection signal is When the generating circuit 11 operates, a signal indicating that the test mode has been selected is input to the microcomputer 6.

Therefore, the microcomputer 6 is not shown.
The control program is read from the ROM, and it is determined whether the signal code output from the wireless reception circuit 5 with reduced reception sensitivity can be decoded, whether the indicator lamp 7 is lit normally, and the alarm sound generator 8.
It is determined whether or not the audio signal is output normally from 1 as is, and both circuits of the test mode selection switch 9 can be turned OFF, allowing monitoring of the presence of an intruder, the occurrence of a fire, etc. at the new installation location of the alarm base unit 1. I can do it.

In addition, if any operation is not performed normally, for example, if the signal code cannot be deciphered, all indicator lamps 7 are turned on and the alarm sound generator 8 is activated to ensure normal notification operation. Report what cannot be done.

Therefore, if all the indicator lamps 7 are lit and the alarm sound generator 8 is activated, the signal code cannot be deciphered, so change the mounting position of the transmitter handset 2 or replace the small battery. Display lamp 7 corresponding to transmitter handset 2
After confirming that the alarm sound generator 8 and the alarm sound generator 8 are activated, connect both circuits of the test mode selection switch 9.
By turning it off, it is possible to monitor the presence or absence of an intruder, the presence or absence of a fire, etc. at the new installation location of the alarm base unit 1.

In addition, if any indicator lamp 7 has a failure, all indicator lamps 7 other than the failure indicator lamp light up and the alarm generator 8 is activated, so that the failure indicator lamp 7 is detected. It can be replaced, and if the alarm sound generator 8 is malfunctioning, all indicator lamps 7 will light up and the alarm sound generator 8 will not operate at all, so the alarm sound generator 8 should be repaired. Or it can be replaced. After completing the necessary replacements and repairs,
After confirming that the display lamp 7 and alarm sound generator 8 corresponding to the transmitter handset 2 are activated, both circuits of the test mode selection switch 9 are turned OFF. At the installation location, it is possible to monitor the presence or absence of intruders, the presence or absence of fire, etc.

In the above case, if the test mode selection switch 9 is turned OFF for both circuits, the sensitivity of the radio reception circuit 5 will be increased to normal reception sensitivity and the monitoring operation will continue as it is.
Even if the power supply voltage of the alarm base unit 1 decreases, or the signal level input to the alarm base unit 1 decreases due to the presence of a shield between the transmitter slave unit 2 and the alarm base unit 1, the alarm base unit 1 cannot be reliably operated. Even if the main alarm unit 1 is transported or moved, it is possible to monitor the presence of an intruder, the occurrence of a fire, etc. without causing any inconvenience.

<Effects> As described above, according to the present invention, in an alarm device used for home security, the alarm base unit is made portable, and the alarm base unit is equipped with a manually operable switch for selecting a test mode. Since this is provided, it is possible to accurately grasp the movement range of the alarm base unit that can reliably issue an alarm.

Therefore, there is no risk of alarm errors even if the alarm base unit is moved, such as by changing the installation location of the alarm base unit during the day and night, and monitoring can be ensured by moving the alarm base unit to a place where people are present. It has the remarkable effect of being able to perform

[Brief explanation of drawings]

FIG. 1 is a simplified front view showing the alarm device of the present invention;
FIG. 2 is a block diagram showing the configuration of the alarm base unit 1.
FIG. 3 is a flowchart showing the operation of the alarm base unit 1. DESCRIPTION OF SYMBOLS 1...Alarm master unit, 2...Transmitter slave unit, 4...Receiving antenna, 5...Wireless reception circuit, 6...Microcomputer, 7...Display lamp, 8...Alarm sound generator, 9... Test mode selection switch, 10
... Sensitivity reduction circuit, 11... Test mode selection signal generation circuit.

Claims (1)

[Scope of Claims] 1. Transmitter devices placed in various places in a house that detect security abnormalities and transmit them wirelessly, and a portable alarm device that receives transmissions from these transmitter devices and generates an alarm. In an alarm device used for security at home, the alarm unit is equipped with a manually operable switch for selecting a test mode, and when the switch is selected, the reception sensitivity of the alarm unit is reduced. An alarm device characterized by being provided with reception sensitivity reduction means.