JPH06215281A - Alarming device for article left behind - Google Patents

Abstract

PURPOSE:To previously prevent the generation of articles left behind or missed and the generation of baggage burglary and to make this alarm compact so that a person can usually carried it by actuating the alarm device when a distance between a receiver and a transmitter becomes longer than a prescribed distance. CONSTITUTION:The transmitting output of a unit A 2 or the receiving sensitivity of a unit B 3 is controlled so that when the units 2, 3 re arranged within a sufficiently near distance, e.g. 3m, the intensity of a receiving signal of the unit 3 is set up to a prescribed level or more, and when the distance exceeds 3m, the intensity is set up to a level less than the prescribed level. In the case of carrying a baggage, the unit 2 is stored in the baggage or connected to the baggage through a string or the like and the unit 3 is carried by a baggage owner. When the distance between both the units 2, 3 exceeds 3m or more, the signal intensity of a radio wave generated from the unit 2 is reduced and an alarm is generated from the unit 3 carried by the owner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lost article alarm device suitable for preventing lost items in portable items.

[0002]

2. Description of the Related Art Hitherto, there has been no effective alarm device for preventing misplacement or loss of portable luggage, or theft of portable luggage. Although there are devices and systems that deal with theft of passenger cars and the like, the size and weight of the alarm device were not portable for individuals.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a forgotten item portable device which can prevent the loss of lost items and lost items, and can prevent theft of luggage such as store and pull, and which can be carried by an individual on a daily basis.

[0004]

A forgotten item warning apparatus according to the present invention for solving the above-mentioned problems includes a transmitter for transmitting a predetermined signal, a receiver for receiving a signal from the transmitter, and the receiver. A signal strength determination means for determining the strength of a received signal provided in the receiver, and an alarm device provided in the receiver or the transmitter for issuing an alarm based on the determination result of the signal strength determination means, and transmitting with the receiver. When the distance to the machine becomes larger than a predetermined distance, the alarm device is activated based on the judgment result of the signal strength judging means.

[0005]

When one unit (for example, the A unit) having the transmitting circuit transmits the signal and the other unit (for example, the B unit) having the receiving / detecting circuit receives the signal, the unit between the A and B units If the distance is greater than the predetermined distance, the reception strength of the second unit will drop below the predetermined value, so the signal strength determination means provided in the second unit will determine the decrease in the strength of the received signal and based on this determination result The alarm device in the unit gives an alarm.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram of a forgotten item warning device according to the present invention. The forgotten item alarm device 1 is composed of an instep unit 2 which is a transmitter and an Otsu unit 3 which is a receiver, and performs one-way communication.

The instep unit 2 comprises a signal generator 4, a transmission circuit 5, an antenna ANT1, a power source 6 and a switch SW,
The transmission circuit 5 uses the signal generated by the signal generator 4 as a transmission wave, and the weak radio wave fA is transmitted from the antenna ANT1 to the second unit 3
Call.

The second unit 3 captures the weak radio wave fA from the instep unit 2 by the antenna ANT2, detects it by the receiving / detecting circuit 7, and extracts a signal, and the signal strength is determined by the signal strength judging means 8. To judge. If the signal strength is below a predetermined level, the alarm device 9 sounds an alarm.

If the instep unit 2 and the second party unit 3 are sufficiently close to each other, for example, within 3 meters, the received signal strength of the second party unit 3 should be a predetermined level or higher.
Adjust the transmission output of Instep Unit 2 or the reception sensitivity of Exhibit Unit 3 so that the level falls below a predetermined level if it exceeds the meter.

When carrying a baggage, the forgotten article alarm device having the above-described structure is provided with the instep unit 2 in the baggage (for example, a bag) or attached with a string or the like.
Bring to yourself. When the distance between the two units is 3 meters or more, the signal strength of the radio wave emitted by the instep unit 2 is lowered, and therefore the second unit 3 carried by the user issues an alarm. Of course, both units can be interchanged and carried. Further, in this embodiment, the alarm sound is generated, but the alarm may be generated by light or other means.

FIG. 2 is a block diagram showing another embodiment of the present invention, in which a signal is reciprocated so that an alarm is sounded on the side of the unit which issued the signal. The second party unit 3 captures the weak radio wave fA from the instep unit 2 with the antenna ANT2, detects it with the reception / detection circuit 7, and extracts a signal, and determines the strength of this signal with the signal strength determination means 8
Determine with. If the signal strength is below a predetermined level, a predetermined signal is transmitted from the transmission circuit 12 to the instep unit 2 via the ANT 3. At this time, the weak radio waves fA and fB
Are configured to have different frequencies.

The instep unit 2 transmits the weak radio wave fB to the antenna A.
Since the signal is extracted by NT4 and detected by the receiving / detecting circuit 13, the alarm device 15 sounds an alarm. The antennas ANT1 and ANT4 may be the same antenna, and the antennas ANT2 and ANT3 may be the same antenna. Further, it goes without saying that an alarm device may be provided in the instep unit 2 and the second order unit 3.

By the way, it is desirable to change the operating frequency flexibly in consideration of the case where the user of the same device is around. FIG. 3A shows a transmission circuit in which the transmission frequency is selectable, and the user selects a plurality of carrier wave oscillators 5a with a selection switch 5b. The selected carrier wave enters the modulator 5c together with the signal S from the signal generator and becomes a transmission wave.

In FIG. 4B, the reception frequency of the receiver for use in combination with the above is selectable, and the user selects a plurality of capacitors C1 to C5 with the capacitor selection switch 7b. Since the tuning frequency changes depending on the combination of the capacitors C1 to C5 and the inductance L, this configuration can cope with the frequency change on the transmitting side. Further, in the embodiment of the present invention, the forgotten item is configured to be prevented by using the radio wave, but it may be configured to prevent the forgotten item by using infrared rays.

As is apparent from the above, since the forgotten item warning device of the present invention has a simple structure and circuit, the battery consumption is minimal, and the outer diameter size can be made into a card size or a coin shape. Ideal for preventing lost items in your portable items.

[0016]

As described above, the forgotten object alarm device according to the present invention provides an alarm provided to at least one of the first and second units when the predetermined signal strength cannot be reached due to the distance between the first and second units. Since the container is configured to give an alarm, it is possible to prevent the luggage from being left behind or lost, and to prevent theft such as misplacement.

[Brief description of drawings]

FIG. 1 is a block diagram of a lost article alarm device according to the present invention.

FIG. 2 is a block diagram of another embodiment according to the present invention.

FIG. 3 is a block diagram of another embodiment according to the present invention.

[Explanation of symbols]

 1 Lost property alarm device 2 Instep unit 3 Otsu unit 4 Signal generator 5 Transmitter circuit 7 Reception / detection circuit 8 Signal strength judgment means 9 Alarm device ANT, ANT2 Antenna

Claims (1)

[Claims] 1. A transmitter for transmitting a predetermined signal, a receiver for receiving a signal from the transmitter, a signal strength determination means provided in the receiver for determining the strength of a received signal, and the receiver. Or a warning device provided in the transmitter for issuing a warning based on the judgment result of the signal strength judgment means, and when the distance between the receiver and the transmitter becomes larger than a predetermined distance, the signal strength judgment means The forgotten item alarm device, which is configured to activate the alarm device based on the determination result of 1.