JPS621097A - Shop lifting preventor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a shoplifting prevention device, and is intended to prevent theft of displayed products.

Conventional technology A variety of devices have been used to prevent product theft, including those that attach a small transmitter to the product to issue an alarm when the product passes through a detection gate, and the other that uses a small receiver modulator attached to the product. There is a structure in which the gate's radio waves are obtained and modulated oscillation is performed, and the gate side device issues an alarm based on the radio wave transmission signal.

C. The problem that the invention aims to solve However, in the former case, the lifespan of the power supply of the small oscillator that should be attached to each side of the product is short (and it is practically impossible to implement because the maintenance cost due to replacing batteries etc. is enormous). However, since the latter has a problem and the alarm transmission is limited to the gate side,
The problem was that it was not possible to identify the culprit among multiple people passing through the gate, and this, combined with personnel issues, made it difficult to obtain sufficient results.

The present invention has been made in view of the above problems, and provides a shoplifting prevention device that can detect shoplifting and issue an alarm, identify the culprit, limit battery consumption only when shoplifting occurs, and has low maintenance costs. The purpose is to

D. Means for Solving the Problems The shoplifting prevention device of the present invention includes a transmitter that has the appearance of a product advertisement image such as a bookmark or price tag attached to each product;
a detection gate provided at a required location in the store and equipped with a means for turning on the transmitter when the transmitter passes and also detecting and announcing passage; and a portable receiver for detecting a signal transmitted from the transmitter. It is composed of

That is, the oscillator has a built-in power source such as a battery, and includes a switching circuit that receives weak radio waves of a specific frequency to turn on and maintain the power source circuit, and an oscillator circuit that oscillates at a specific frequency using the power source circuit. , consists of a modulation circuit that converts the oscillation frequency to a specific frequency and a transmission circuit that wirelessly transmits the modulation signal, and the initial drive power of the switching element in the switching circuit is controlled by a plurality of parallel-wound coils. It's something you can get.

The above-mentioned multiple parallel winding coil has a special structure in which two or more coiled parts are each wound once or multiple times using a single conducting wire, and are arranged in parallel in the direction of the winding surface. , both ends of the parallel-wound coil and the switching element were connected via a rectifier.

E. Function The above-mentioned parallel-wound coil generates a weak electromotive force at both ends of the coil in a radio wave environment of a predetermined frequency like a normal coil. The voltage required for this can be obtained within a weak radio wave band below 15 W, and the electromotive force of the parallel-wound coil can be used as it is as the initial drive power source for the transistor via a rectifier.

Therefore, when passing through the gate, the oscillator turns on and maintains the power supply circuit depending on the frequency atmosphere transmitted by the gate, and uses the built-in power supplied from the power supply circuit to turn on the power supply circuit through the oscillation circuit, modulation circuit, and transmission circuit. It will transmit and maintain radio waves of a specific frequency from a small built-in antenna.

A receiving means for receiving this specific frequency is provided in the detection gate and the portable receiver, and the detection gate receives the received signal and transmits the signal to the gate and an alarm position provided at a desired position.
It announces the Detection 11 signal, and by bringing the above mobile receiver close to the person passing through the detection gate during the 11 Detection i+, the radio signal of the transmitter can be received and the position of the transmitter can be confirmed. In other words, the culprit in shoplifting can be identified.

Embodiment Hereinafter, an embodiment of the shoplifting prevention device of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the principle thereof.

The transmitter 1) to be attached to product a is housed in a flat shell 10 such as a card or sheet configured in a desired shape such as a triangle or rectangle as shown in FIG. It is made up of an advertisement or a display printed to camouflage it, and has a built-in small battery 2 such as a sheet battery or a button battery.

As shown in FIG. 6, the oscillator is a switching device that receives weak radio waves of a specific frequency to turn on the power supply circuit 6, and receives power from the power supply circuit 6 depending on the ON operation to maintain the ON operation. a circuit 4, an oscillation circuit 5 that receives power supply from the small battery 2 of the power supply circuit 3 and oscillates at a specific frequency when the switching circuit 4 is turned on, and modulates the oscillation frequency into a radio wave signal of a predetermined frequency. It consists of a modulating circuit 6 that transmits the modulated signal, and a transmitting circuit 7 that wirelessly transmits the modulated signal, and the transmitting antenna 8 of the transmitting circuit 7 also includes a flat shell 10.
contained within.

Further, the switching circuit 4 can obtain a pace current of the transistor T1 serving as the switching element by a magnetic field current generated in the parallel winding coil 9, and has two diodes D.
The parallel winding coil 9 is formed by winding a conductive wire of a predetermined length once or multiple times as shown in FIG. The two coiled portions 12 and 12 are arranged in parallel in the direction of the winding surface via a connecting portion 13 in the shape of a pair of glasses.

The detection gate 15 also includes a known radio wave transmitting means 16 that transmits a weak radio wave (0.5 W or less) in a resonant frequency range of the parallel winding coil in a limited range, and a known radio wave transmitting means 16 that receives the radio wave transmitted from the front transmitter 1. Receiving means 17, and notification devices 18a, 18 that receive the received signal and make various desired notifications such as warnings or announcements.
It consists of b.

Reference numeral 20 denotes a portable receiver incorporating a known receiving means for receiving the radio waves transmitted by the transmitter 1.

The shoplifting prevention device having the above structure is used by installing the detection gate 15 at or near the entrance of the store so as to block the entrance with a radio wave enclosure, and by attaching the transmitter 1 to each product. , when a normal sale is completed, the person in charge collects the transmitter 1.

Due to a theft incident, transmitter 1 and product a are detected at detection gate 1.
5, the parallel winding coil 9 receives the weak radio wave from the transmitting means 16 of the detection gate 15 and generates a magnetic current, so the transistor T1 of the switching circuit 4 turns on.
Radio waves of a predetermined frequency are transmitted from a transmitting antenna 8 via an oscillating circuit 5, a modulating circuit 6, and a transmitting circuit 7 using a built-in small battery 2.

The receiving means 17 of the detection gate 15 receives this radio wave signal, and by ringing or lighting up the notifiers 18a and 18b in response to the received signal, it is announced that the transmitter 1 has passed through the detection gate 15.

Based on the above notification, the staff member can know the shoplifter who has passed through the detection gate 15.

However, when a plurality of customers are passing through the detection gate 15 at the same time, the portable receiver 20 receives the radio wave signal from the transmitter 1 by bringing the portable receiver 20 close to it, and the portable receiver 20 receives the radio wave signal from the transmitter 1. Make a sound and be able to identify the culprit.

G. Effects of the Invention As mentioned above, the shoplifting prevention device of the present invention can identify the culprit, so it not only eliminates personnel problems, but also uses the built-in battery only when a theft accident occurs. Therefore, the maintenance cost can be kept low, and the practical effects of the present invention are extremely large.

[Brief explanation of drawings]

The drawings show an embodiment of the shoplifting prevention device of the present invention, and FIG. 1 is an overall block diagram, FIG. 2 is a partially cutaway front view of the oscillator, FIG. 6 is a circuit diagram of the oscillator, and FIG. Figure a is a front view of the parallel winding coil, figure b is a plan view of the same, and figure C is a right side view of the same. 1 - Transmitter 2 - Small battery 3 - Power supply circuit 4 - Switching circuit 5 - Oscillation circuit 6 - Modulation circuit 7 - Transmission circuit 8 - Transmission antenna 9 - Parallel winding coil 10 - Flat shell 15 - Detection gate 20 - Portable Receiver a ~ Product June 7, 1985 Figure 1

Claims (1)

[Claims] (1) It has a flat appearance that can be attached to individual products, has a built-in small power supply, has a switching circuit that turns on and maintains the power supply circuit using external radio waves, and transmits a radio wave signal of a predetermined frequency based on the power supply. a transmitter having a built-in transmitting circuit to turn on a switching circuit of the transmitter, and a transmitting means for forming a weak radio wave of a predetermined frequency to turn on a switching circuit of the transmitter; A shoplifting prevention device consisting of a detection gate that activates an alarm.