JPS5710481A - Monitoring device using light signal - Google Patents
Monitoring device using light signalInfo
- Publication number
- JPS5710481A JPS5710481A JP8431580A JP8431580A JPS5710481A JP S5710481 A JPS5710481 A JP S5710481A JP 8431580 A JP8431580 A JP 8431580A JP 8431580 A JP8431580 A JP 8431580A JP S5710481 A JPS5710481 A JP S5710481A
- Authority
- JP
- Japan
- Prior art keywords
- light
- reflector plate
- foreign object
- receiving units
- received
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/04—Systems determining the presence of a target
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Geophysics And Detection Of Objects (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
PURPOSE:To make possible the detection of a foreign object entering a monitoring area even when the object has the same reflection efficiency as that of a reflector plate by a method wherein a light signal from a light emitting unit is received by two of light receiving units. CONSTITUTION:A light sending and receiving device 10 has light emitting units 110-119 and light receiving units 120-1210 arranged one after another, and faces a reflector 13 provided with a reflector plate 13a used to reflect incident light beams in the roughly some directin via the operating unit of a press. Light emission bodies 110-119 each emits a pair of light signals l1 and l2, l3 and l4... l19 and l20. The light signal involved is reflected by the reflector plate 13a and received by the light receiving units 120 and 121, 121 and 122... or 129 and 1210 in order to form a monitoring region 14. By so constructing the device, when a foreign object with the same relection efficiency as that of the reflector plate 13a enters the monitoring region 14, the light of the foreign object is not received by the pair of light receiving units and is judged as a foreign object because it is not supposed to reflect light in the same direction against the incident light like the reflector plate 13a.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8431580A JPS5710481A (en) | 1980-06-21 | 1980-06-21 | Monitoring device using light signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8431580A JPS5710481A (en) | 1980-06-21 | 1980-06-21 | Monitoring device using light signal |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5710481A true JPS5710481A (en) | 1982-01-20 |
Family
ID=13827067
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8431580A Pending JPS5710481A (en) | 1980-06-21 | 1980-06-21 | Monitoring device using light signal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5710481A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57153976A (en) * | 1981-03-18 | 1982-09-22 | Hitachi Ltd | Method and device for obtaining high pressure gas from low pressure gas source |
JPS6270787A (en) * | 1985-09-24 | 1987-04-01 | Takenaka Denshi Kogyo Kk | State discrimination type multiple optical axis photoelectric switch |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5167175A (en) * | 1974-12-09 | 1976-06-10 | Yamakawa Denshi Kk | |
JPS51143353A (en) * | 1975-06-05 | 1976-12-09 | Yamakawa Denshi Kk | Coaxial reflected-ray detector |
-
1980
- 1980-06-21 JP JP8431580A patent/JPS5710481A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5167175A (en) * | 1974-12-09 | 1976-06-10 | Yamakawa Denshi Kk | |
JPS51143353A (en) * | 1975-06-05 | 1976-12-09 | Yamakawa Denshi Kk | Coaxial reflected-ray detector |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57153976A (en) * | 1981-03-18 | 1982-09-22 | Hitachi Ltd | Method and device for obtaining high pressure gas from low pressure gas source |
JPS6270787A (en) * | 1985-09-24 | 1987-04-01 | Takenaka Denshi Kogyo Kk | State discrimination type multiple optical axis photoelectric switch |
JPH0352035B2 (en) * | 1985-09-24 | 1991-08-08 | Takenaka Electronic Ind |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA2380917A1 (en) | Optical sub-pixel parts inspection system | |
JPS5397448A (en) | Self amplifying deflection scanning optical system | |
US5008530A (en) | Autocollimation light curtain | |
BG103823A (en) | Instrument for monitoring the qualities of sheet materials | |
JPS5710481A (en) | Monitoring device using light signal | |
EP0310932A3 (en) | Light barrier with reflector | |
GB1251713A (en) | ||
DE69320018D1 (en) | Device for optically scanning a surface | |
JPS53142250A (en) | Scanning optical system of high scanning efficiency | |
JPS55107942A (en) | Inspecting method of plate | |
JPS5686340A (en) | Automatic detector for foreign matter | |
JPS6449930A (en) | Multiple reflection cell | |
JPS5337457A (en) | Distance measuring device | |
JPS5676074A (en) | Obstacle detector | |
CA2271797A1 (en) | Detection system with improved noise tolerance | |
JPS6050403A (en) | Distance sensor | |
JPS5296586A (en) | Light attenuation type smoke detector | |
JPS56122173A (en) | Photoelectric switch | |
JPS5596078A (en) | Laver screening device | |
JPS5611433A (en) | Light modulator | |
JPS57149949A (en) | Raindrop sensor | |
JPS56157862A (en) | Natural disaster detector | |
JPS5767374A (en) | Multibeam recorder | |
JPS6417347A (en) | Reflection type photoelectric switch | |
JPS5740668A (en) | Signal detector |