JPH0382477U - - Google Patents
Info
- Publication number
- JPH0382477U JPH0382477U JP14088689U JP14088689U JPH0382477U JP H0382477 U JPH0382477 U JP H0382477U JP 14088689 U JP14088689 U JP 14088689U JP 14088689 U JP14088689 U JP 14088689U JP H0382477 U JPH0382477 U JP H0382477U
- Authority
- JP
- Japan
- Prior art keywords
- radio waves
- pulse train
- theft device
- train signal
- receiving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Description
第１図はこの考案の盗難防装置の１実施例を示
す制御ブロツク図、第２図は、第１図における８
ビツトデジタルスイツチのオン／オフ設定状態を
示す図、第３図は、第２図図示のごとく８ビツト
デジタルスイツチ４を設定したときの、８ビツト
のパルス列を示す図、第４図は、８ビツトデジタ
ルスイツチの別のオン／オフ設定状態を示す図、
第５図は、第４図図示のごとく８ビツトデジタル
スイツチ４を設定したときの、８ビツトのパルス
列を示す図、第６図は、第１図図示の装置で設定
できる動作モードの動作期間を示す図、第７図は
、第１図図示の装置の動作を説明するために用い
たタイムチヤート、第８図及び第９図は、装置を
複数台運用するときの運転方法を示す図である。
１……送信器、２……送信アンテナ、３……８
ビツトパルス発生回路、４……８ビツトデジタル
スイツチ、５……スタート回路、６……電源トラ
ンス、７……極性切換スイツチ、８……タグ、９
……受信器、１０……受信アンテナ、１１……し
きい値判定回路、１３……一致判定回路、１４…
…パルスカウンター、１５……タイマー、１６…
…警報ブザー。
FIG. 1 is a control block diagram showing one embodiment of the theft prevention device of this invention, and FIG.
Figure 3 shows the on/off setting state of the bit digital switch. Figure 3 shows the 8-bit pulse train when the 8-bit digital switch 4 is set as shown in Figure 2. Figure 4 shows the 8-bit pulse train. A diagram showing different on/off setting states of the digital switch,
FIG. 5 shows an 8-bit pulse train when the 8-bit digital switch 4 is set as shown in FIG. 4, and FIG. 6 shows the operation period of the operation mode that can be set with the device shown in FIG. 7 is a time chart used to explain the operation of the device shown in FIG. 1, and FIGS. 8 and 9 are diagrams showing an operating method when multiple devices are operated. . 1...Transmitter, 2...Transmission antenna, 3...8
Bit pulse generation circuit, 4... 8-bit digital switch, 5... Start circuit, 6... Power transformer, 7... Polarity changeover switch, 8... Tag, 9
... Receiver, 10 ... Receiving antenna, 11 ... Threshold judgment circuit, 13 ... Coincidence judgment circuit, 14 ...
...Pulse counter, 15...Timer, 16...
...Alarm buzzer.
Claims (1)
、該タグから二次的に輻射される電波を受信する
ことにより商品の盗難を検知する盗難防止装置で
あつて、 所定のパルス列の信号を発生するパルス発生回
路と 前記パルス発生回路よりのパルス列の信号に基
づき断続した電波を出力する送信手段と、 送信手段より送信された電波により、前記タグ
から輻射される電波を受信し検波する受信手段と
、 受信手段よりの受信パルス列の信号と、前記パ
ルス発生回路で出力された元のパルス列の信号と
が一致するか否かを判定する判定手段と、 判定手段で前記両者のパルス列の信号が一致す
るとき、所定の警報を出力する警報出力手段と、 を備えたことを特徴とする盗難防止装置。 (2) 電源電圧の半周期毎に動作可能とし、かつ
いずれの半周期毎に動作させるかを選択する動作
モード選択手段を更に備えた、請求項(1)記載の
盗難防止装置。 (3) 上記電波の周波数がＧＨｚ帯である請求項(
1)もしくは(2)項のいずれかに記載の盗難防止装
置。[Scope of Utility Model Registration Claim] (1) An anti-theft device that detects theft of a product by transmitting radio waves entering a tag attached to the product and receiving secondarily radiated radio waves from the tag. A pulse generating circuit that generates a predetermined pulse train signal; a transmitting means that outputs intermittent radio waves based on the pulse train signal from the pulse generating circuit; and radio waves transmitted from the transmitting means that are radiated from the tag. a receiving means for receiving and detecting radio waves; a determining means for determining whether or not a received pulse train signal from the receiving means matches the original pulse train signal outputted by the pulse generating circuit; and a determining means. An anti-theft device comprising: alarm output means for outputting a predetermined alarm when the two pulse train signals match. (2) The anti-theft device according to claim (1), further comprising operation mode selection means that enables operation every half cycle of the power supply voltage and selects which half cycle to operate. (3) Claim in which the frequency of the radio waves is in the GHz band (
The anti-theft device described in either paragraph 1) or (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14088689U JPH0382477U (en) | 1989-12-05 | 1989-12-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14088689U JPH0382477U (en) | 1989-12-05 | 1989-12-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0382477U true JPH0382477U (en) | 1991-08-22 |
Family
ID=31687827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14088689U Pending JPH0382477U (en) | 1989-12-05 | 1989-12-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0382477U (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5348499A (en) * | 1976-08-18 | 1978-05-01 | Knogo Corp | Method and device detecting existence of article in searching area |
| JPS57206995A (en) * | 1981-06-15 | 1982-12-18 | Sharp Kk | Detection signal transmitter for total indoor security system |
| JPS62193229A (en) * | 1986-02-12 | 1987-08-25 | センサマティック、イレクトラニクス、コーパレイシャン | Electromagnetic device, ferromagnetic label, manufacture of electromagnetic device and ferromagnetic label, method of providing resultant and differential frequency and method ofdetecting passage of object not allowed to pass |
| JPH01121996A (en) * | 1987-11-06 | 1989-05-15 | Sony Corp | Monitor |
-
1989
- 1989-12-05 JP JP14088689U patent/JPH0382477U/ja active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5348499A (en) * | 1976-08-18 | 1978-05-01 | Knogo Corp | Method and device detecting existence of article in searching area |
| JPS57206995A (en) * | 1981-06-15 | 1982-12-18 | Sharp Kk | Detection signal transmitter for total indoor security system |
| JPS62193229A (en) * | 1986-02-12 | 1987-08-25 | センサマティック、イレクトラニクス、コーパレイシャン | Electromagnetic device, ferromagnetic label, manufacture of electromagnetic device and ferromagnetic label, method of providing resultant and differential frequency and method ofdetecting passage of object not allowed to pass |
| JPH01121996A (en) * | 1987-11-06 | 1989-05-15 | Sony Corp | Monitor |
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