JPS643991U - - Google Patents
Info
- Publication number
- JPS643991U JPS643991U JP9686287U JP9686287U JPS643991U JP S643991 U JPS643991 U JP S643991U JP 9686287 U JP9686287 U JP 9686287U JP 9686287 U JP9686287 U JP 9686287U JP S643991 U JPS643991 U JP S643991U
- Authority
- JP
- Japan
- Prior art keywords
- detection
- sensor
- detected object
- utility
- area
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims description 16
- 230000003287 optical effect Effects 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims 6
- 230000000903 blocking effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 230000004397 blinking Effects 0.000 description 1
Landscapes
- Fencing (AREA)
- Burglar Alarm Systems (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1987096862U JPH0542555Y2 (en]) | 1987-06-23 | 1987-06-23 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1987096862U JPH0542555Y2 (en]) | 1987-06-23 | 1987-06-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS643991U true JPS643991U (en]) | 1989-01-11 |
JPH0542555Y2 JPH0542555Y2 (en]) | 1993-10-26 |
Family
ID=31321991
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1987096862U Expired - Lifetime JPH0542555Y2 (en]) | 1987-06-23 | 1987-06-23 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0542555Y2 (en]) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55110393A (en) * | 1979-02-15 | 1980-08-25 | Matsushita Electric Works Ltd | Crime prevention device using fence |
JPS59216078A (ja) * | 1983-08-08 | 1984-12-06 | Optic Kk | 来客報知器 |
-
1987
- 1987-06-23 JP JP1987096862U patent/JPH0542555Y2/ja not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55110393A (en) * | 1979-02-15 | 1980-08-25 | Matsushita Electric Works Ltd | Crime prevention device using fence |
JPS59216078A (ja) * | 1983-08-08 | 1984-12-06 | Optic Kk | 来客報知器 |
Also Published As
Publication number | Publication date |
---|---|
JPH0542555Y2 (en]) | 1993-10-26 |
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