JPH0299492U - - Google Patents
Info
- Publication number
- JPH0299492U JPH0299492U JP618989U JP618989U JPH0299492U JP H0299492 U JPH0299492 U JP H0299492U JP 618989 U JP618989 U JP 618989U JP 618989 U JP618989 U JP 618989U JP H0299492 U JPH0299492 U JP H0299492U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- pulses
- oscillation
- detection signal
- circuit
- 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
- 238000001514 detection method Methods 0.000 claims description 5
- 230000010355 oscillation Effects 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 7
Landscapes
- Burglar Alarm Systems (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP618989U JPH0299492U (fr) | 1989-01-23 | 1989-01-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP618989U JPH0299492U (fr) | 1989-01-23 | 1989-01-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0299492U true JPH0299492U (fr) | 1990-08-08 |
Family
ID=31509867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP618989U Pending JPH0299492U (fr) | 1989-01-23 | 1989-01-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0299492U (fr) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56108189A (en) * | 1980-01-07 | 1981-08-27 | Mastiff Security Syst Ltd | Radio frequency detector and approach control system using same |
| JPS56123096A (en) * | 1980-02-29 | 1981-09-26 | Tokyo Shibaura Electric Co | Forget preventing unit |
| JPS59197995A (ja) * | 1983-04-25 | 1984-11-09 | 三菱電機株式会社 | ビル遠隔監視システム |
-
1989
- 1989-01-23 JP JP618989U patent/JPH0299492U/ja active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56108189A (en) * | 1980-01-07 | 1981-08-27 | Mastiff Security Syst Ltd | Radio frequency detector and approach control system using same |
| JPS56123096A (en) * | 1980-02-29 | 1981-09-26 | Tokyo Shibaura Electric Co | Forget preventing unit |
| JPS59197995A (ja) * | 1983-04-25 | 1984-11-09 | 三菱電機株式会社 | ビル遠隔監視システム |
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