JPS5710481A - Monitoring device using light signal - Google Patents

Monitoring device using light signal

Info

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
Application number
JP8431580A
Other languages
Japanese (ja)
Inventor
Shigeyasu Shimizu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MITSUE KOGYO KK
Sankei Kogyo KK
Original Assignee
MITSUE KOGYO KK
Sankei Kogyo KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MITSUE KOGYO KK, Sankei Kogyo KK filed Critical MITSUE KOGYO KK
Priority to JP8431580A priority Critical patent/JPS5710481A/en
Publication of JPS5710481A publication Critical patent/JPS5710481A/en
Pending legal-status Critical Current

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)
  • Length Measuring Devices By Optical Means (AREA)
  • Geophysics And Detection Of Objects (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.
JP8431580A 1980-06-21 1980-06-21 Monitoring device using light signal Pending JPS5710481A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

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