GB2023282A - A light-curtain means - Google Patents

A light-curtain means

Info

Publication number
GB2023282A
GB2023282A GB7912351A GB7912351A GB2023282A GB 2023282 A GB2023282 A GB 2023282A GB 7912351 A GB7912351 A GB 7912351A GB 7912351 A GB7912351 A GB 7912351A GB 2023282 A GB2023282 A GB 2023282A
Authority
GB
United Kingdom
Prior art keywords
oscillator
light
devices
output
light detecting
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
Application number
GB7912351A
Other versions
GB2023282B (en
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.)
TELUB AB
Original Assignee
TELUB AB
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 TELUB AB filed Critical TELUB AB
Publication of GB2023282A publication Critical patent/GB2023282A/en
Application granted granted Critical
Publication of GB2023282B publication Critical patent/GB2023282B/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00—Prospecting or detecting by optical means
    • G01V8/10—Detecting, e.g. by using light barriers
    • G01V8/20—Detecting, e.g. by using light barriers using multiple transmitters or receivers

Landscapes

  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Electronic Switches (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

A light-curtain having a plurality of light emitting devices (S1 to Sn) on one side of a monitoring area (1a) and a plurality of light detecting devices (M1 to Mn) on the opposite side of the monitoring area (1a). Both sets of devices can be energized by pulses generated from an oscillator (2) such that said devices are energized in pairs in cyclic manner. The output from the oscillator (2) is also applied to one input of a bistable (10). A counter stage (5) supplied by an oscillator (6) phase locked to oscillator (2) is arranged to generate a signal with the same signal sequence as is obtained from the light detecting devices (M1 to Mn) with an unbroken light curtain. The output from the oscillator (6) is applied to one input of a bistable (7). The other inputs of the bistables (7 and 10) receive outputs from the light detecting devices (M1 to Mn) and the counter stage (5) through exclusive OR gates (8 and 9). Monitoring means (11) compares the states of the two bistables an output signal is generated if they are different. The arrangement is arranged to check operation of the sources, detectors and circuits at least once during each cycle and if faults are detected cause generation of a control signal e.g. to shut down a press. <IMAGE>
GB7912351A 1978-04-10 1979-04-09 Light-curtain means Expired GB2023282B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7803985A SE418426B (en) 1978-04-10 1978-04-10 Light Curtain

Publications (2)

Publication Number Publication Date
GB2023282A true GB2023282A (en) 1979-12-28
GB2023282B GB2023282B (en) 1983-01-06

Family

ID=20334543

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7912351A Expired GB2023282B (en) 1978-04-10 1979-04-09 Light-curtain means

Country Status (6)

Country Link
JP (1) JPS554690A (en)
DE (1) DE2914329A1 (en)
DK (1) DK149979A (en)
GB (1) GB2023282B (en)
NO (1) NO791203L (en)
SE (1) SE418426B (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2504709A1 (en) * 1981-04-28 1982-10-29 Alsthom Cgee Infrared intruder alarm system - uses pulsed 10 to 100 kilohertz high frequency modulated signal transmitted using IR LED
EP0095948A2 (en) * 1982-06-02 1983-12-07 Fujitsu Limited Detecting article edges
WO1984002413A1 (en) * 1982-12-16 1984-06-21 Innocap Ab A microprocessor-controlled light screen
GB2133537A (en) * 1982-12-16 1984-07-25 Glyben Automation Limited Position detector system
GB2177216A (en) * 1985-07-05 1987-01-14 Baumer Electric Ag Proximity switch
GB2177503A (en) * 1985-06-12 1987-01-21 John Peter Hughes Guard system
WO1989007276A1 (en) * 1988-02-02 1989-08-10 Erwin Sick Gmbh Photoelectric barrier grid
WO1990008092A1 (en) * 1989-01-18 1990-07-26 Formula Systems Limited Detector systems
WO1990008333A1 (en) * 1988-11-04 1990-07-26 Mats Linger Safety guard beam light switch
FR2656914A1 (en) * 1990-01-09 1991-07-12 Scient Technologies Inc CIRCUIT AND METHOD FOR CONTROLLING A LIGHT CURTAIN SYSTEM.
EP0567717A1 (en) * 1992-04-30 1993-11-03 REER S.p.A. Optoelectronic barrier
EP0962788A2 (en) * 1998-06-03 1999-12-08 Keyence Corporation Multi-optical-path photoswitch having capable of detecting multiple light emission
EP1048927A3 (en) * 1999-04-28 2001-11-28 Carl Zeiss Optical collision protection device for moving machine parts
DE102006059370A1 (en) * 2006-12-15 2008-06-26 Sick Ag light Curtain
DE102007031430A1 (en) * 2007-07-05 2009-01-15 Sick Ag Operating process for light grid involves automation of code selection by selecting all prepared codes in succession
EP2431768B1 (en) * 2010-09-21 2014-03-05 Sick Ag Light grid
CN112363238A (en) * 2020-11-25 2021-02-12 上海长江电气设备集团有限公司 Light curtain light beam alignment correction method, light curtain receiver, transmitter and storage medium
EP4026973A1 (en) * 2021-01-07 2022-07-13 CAME S.p.A. Control system for access point devices

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58154379A (en) * 1982-03-05 1983-09-13 Bunka Shutter Kk Limit regulator for shutter
DE3237606A1 (en) * 1982-10-11 1984-04-12 Löbel, Monika, 4330 Mülheim Electronic level switch with self-protecting control unit
JPS60226499A (en) * 1984-04-24 1985-11-11 Seiko Epson Corp Synthesis of ruby single crystal
DE3939191C3 (en) * 1989-11-27 1996-02-08 Lumiflex Gmbh & Co Kg Elektron Multi-beam through-beam sensor
US5577733A (en) * 1994-04-08 1996-11-26 Downing; Dennis L. Targeting system

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2504709A1 (en) * 1981-04-28 1982-10-29 Alsthom Cgee Infrared intruder alarm system - uses pulsed 10 to 100 kilohertz high frequency modulated signal transmitted using IR LED
EP0095948A2 (en) * 1982-06-02 1983-12-07 Fujitsu Limited Detecting article edges
EP0095948A3 (en) * 1982-06-02 1986-12-17 Fujitsu Limited Detecting article edges
WO1984002413A1 (en) * 1982-12-16 1984-06-21 Innocap Ab A microprocessor-controlled light screen
GB2133537A (en) * 1982-12-16 1984-07-25 Glyben Automation Limited Position detector system
GB2177503A (en) * 1985-06-12 1987-01-21 John Peter Hughes Guard system
GB2177216A (en) * 1985-07-05 1987-01-14 Baumer Electric Ag Proximity switch
GB2177216B (en) * 1985-07-05 1989-07-19 Baumer Electric Ag Proximity switch
WO1989007276A1 (en) * 1988-02-02 1989-08-10 Erwin Sick Gmbh Photoelectric barrier grid
WO1990008333A1 (en) * 1988-11-04 1990-07-26 Mats Linger Safety guard beam light switch
WO1990008092A1 (en) * 1989-01-18 1990-07-26 Formula Systems Limited Detector systems
GB2242742B (en) * 1990-01-09 1994-07-13 Scient Technologies Inc Self-checking light curtain system and method of operation
GB2242742A (en) * 1990-01-09 1991-10-09 Scient Technologies Inc Self-checking light curtain system and method of operation
FR2656914A1 (en) * 1990-01-09 1991-07-12 Scient Technologies Inc CIRCUIT AND METHOD FOR CONTROLLING A LIGHT CURTAIN SYSTEM.
EP0567717A1 (en) * 1992-04-30 1993-11-03 REER S.p.A. Optoelectronic barrier
US5424532A (en) * 1992-04-30 1995-06-13 Reer S.P.A. Multi-beam light barrier with monitoring of malfunction
US6236036B1 (en) 1998-03-06 2001-05-22 Keyence Corporation Multi-optical-path photoswitch with capability of detecting multiple light emission
EP0962788A2 (en) * 1998-06-03 1999-12-08 Keyence Corporation Multi-optical-path photoswitch having capable of detecting multiple light emission
EP0962788A3 (en) * 1998-06-03 2000-10-18 Keyence Corporation Multi-optical-path photoswitch having capable of detecting multiple light emission
EP1048927A3 (en) * 1999-04-28 2001-11-28 Carl Zeiss Optical collision protection device for moving machine parts
DE102006059370A1 (en) * 2006-12-15 2008-06-26 Sick Ag light Curtain
DE102007031430A1 (en) * 2007-07-05 2009-01-15 Sick Ag Operating process for light grid involves automation of code selection by selecting all prepared codes in succession
DE102007031430B4 (en) * 2007-07-05 2016-12-01 Sick Ag Method for operating a light grid and light grid
EP2431768B1 (en) * 2010-09-21 2014-03-05 Sick Ag Light grid
US9128201B2 (en) 2010-09-21 2015-09-08 Sick Ag Light grid
CN112363238A (en) * 2020-11-25 2021-02-12 上海长江电气设备集团有限公司 Light curtain light beam alignment correction method, light curtain receiver, transmitter and storage medium
CN112363238B (en) * 2020-11-25 2022-09-06 上海长江电气设备集团有限公司 Light curtain light beam alignment correction method, light curtain receiver, transmitter and storage medium
EP4026973A1 (en) * 2021-01-07 2022-07-13 CAME S.p.A. Control system for access point devices

Also Published As

Publication number Publication date
GB2023282B (en) 1983-01-06
NO791203L (en) 1979-10-11
DE2914329A1 (en) 1979-11-15
JPS554690A (en) 1980-01-14
SE7803985L (en) 1979-10-11
SE418426B (en) 1981-05-25
DK149979A (en) 1979-10-11

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee