JPS6232496U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a detailed block diagram of a signal delay circuit showing an embodiment of the present invention, Fig. 2 is a detailed block diagram of the signal delay circuit shown in Fig. 1, Fig. 3 is a time chart, and Fig. 4 is a conventional signal delay circuit. FIG. 2 is a block diagram of an intrusion alarm device. 1a, 1b are open/close sensors, 2a, 2b are RF transmitters, 3a, 3b are code signal setters, 4 is RF
9 is a code signal identification circuit, 10 is an alarm circuit, and 11a and 11b are signal delay circuits. still,
The same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] Open/close sensors installed on windows or doors allow
An intruder alarm system that detects the presence of an intruder, emits RF radio waves from an RF transmitter, and notifies a receiver with a built-in alarm circuit installed in a remote location, which detects the open/closed status of windows and doors. an RF transmitter that emits RF radio waves using the output panus of this signal delay circuit;
A code signal setting circuit that adds a code signal to the RF radio waves of the transmitter, a receiving circuit that receives the RF radio waves, and an alarm circuit that generates an alarm signal based on the output of the code identification circuit from the receiving circuit. Intrusion alarm system.