JPS63168594U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an outline of an embodiment of the present invention;
FIG. 2 is a block diagram of the transmitter, FIG. 3 is a block diagram of the receiver, and FIG. 4 is a circuit diagram of a switch for switching between lost child alarm and found alarm.

Claims (1)

[Claims for Utility Model Registration] 1. Consists of a transmitter that emits weak radio waves modulated with a specific signal and a receiver that receives the modulated radio waves within a short distance. The load circuit is open (off) while the signal output is being output, and when the distance between the transmitter and receiver increases, the received radio waves become weaker, and the signal output level of the receiver falls below a certain value, the load circuit closes. A lost child prevention device that closes (connects) and issues a predetermined alarm when the load circuit is closed. 2. By switching the signal output circuit after the distance between the transmitter and receiver increases and an alarm is issued, a specific signal will not be emitted when the signal output level of the receiver is below a certain value, contrary to the load circuit, and the distance will increase. When the received output signal level exceeds a certain value as the signal approaches the specified signal (
A device for preventing lost children according to claim 1, which is configured to emit a detection signal (detection signal).