GB1436953A - Light barrier screen - Google Patents

Light barrier screen

Info

Publication number
GB1436953A
GB1436953A GB4488373A GB4488373A GB1436953A GB 1436953 A GB1436953 A GB 1436953A GB 4488373 A GB4488373 A GB 4488373A GB 4488373 A GB4488373 A GB 4488373A GB 1436953 A GB1436953 A GB 1436953A
Authority
GB
United Kingdom
Prior art keywords
detector
gives
switch
danger zone
light
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.)
Expired
Application number
GB4488373A
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.)
Erwin Sick GmbH Optik Elektronik
Original Assignee
Erwin Sick GmbH Optik Elektronik
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 Erwin Sick GmbH Optik Elektronik filed Critical Erwin Sick GmbH Optik Elektronik
Publication of GB1436953A publication Critical patent/GB1436953A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/12—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine
    • F16P3/14—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact
    • F16P3/144—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact using light grids
    • 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
    • G01V8/22—Detecting, e.g. by using light barriers using multiple transmitters or receivers using reflectors
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/181—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems
    • G08B13/183—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier
    • G08B13/184—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier using radiation reflectors

Landscapes

  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Burglar Alarm Systems (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Electronic Switches (AREA)

Abstract

1436953 Machinery safety device E SICK [trading as ERWIN SICK OPTIK-ELEKTRONIK] 25 Sept 1973 [26 Sept 1972] 44883/73 Heading F2J [Also in Division G1] A light barrier screen such as may be used as a safety device to switch off a machine when an operator places his hand in a danger zone has a set of light sources which are pulsed in sequence by a single power supply. This minimizes the power requirements but provided the pulsing is rapid enough the safety device remains effective. A common detector may be used for all the light sources, and a reference detector may be used to compensate for ambient light, ageing or temperature effects. Fig. 1 shows a set of LED sources 11-16 fed in sequence from power supply 17 via sequential switch 17a. The light path from source 11 to a detector 26 via danger zone 24 is seen from above in Fig. 2, where the reference path to a detector 32 via mirror 42 is also seen. Similar paths exist via the other lenses of Fig. 1 from sources 12-16 to their respective detectors. Fig. 3 (not shown) and Fig. 4 show how use of a curved mirror 40 and a wedge 62 permit the use of a single danger zone detector 38 and a single reference detector 41. Detector circuit.-In Fig. 5 the pulses from detectors 38, 41 are amplified and applied to trigger 58; this gives a zero output as long as the signal from 38 is less than that of 41. A differentiator 59 gives an output only for a positive going impulse, while a differentiator 60 gives an output only for negative going impulses from 58. As a result, bi-stable 61 gives a train of regular pulses during normal operation, but if a light beam in the danger zone is broken one or more pulses from 61 is absent. This can be detected by a device such as a relay receiving the output of bi-stable 61. When this arrangement is used with Fig. 1 a switch synchronized with switch 17a connects the detector circuit to the appropriate pair of detectors. The arrangement is fail-safe.
GB4488373A 1972-09-26 1973-09-25 Light barrier screen Expired GB1436953A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2247053A DE2247053C3 (en) 1972-09-26 1972-09-26 Light barrier

Publications (1)

Publication Number Publication Date
GB1436953A true GB1436953A (en) 1976-05-26

Family

ID=5857357

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4488373A Expired GB1436953A (en) 1972-09-26 1973-09-25 Light barrier screen

Country Status (7)

Country Link
US (1) US3858043A (en)
JP (1) JPS5527315B2 (en)
CH (1) CH558060A (en)
DE (1) DE2247053C3 (en)
GB (1) GB1436953A (en)
IT (1) IT993021B (en)
SE (1) SE391249B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2171195A (en) * 1985-02-15 1986-08-20 Alps Electric Co Ltd Photoelectric touch panels
GB2177503A (en) * 1985-06-12 1987-01-21 John Peter Hughes Guard system
GB2207999A (en) * 1987-08-13 1989-02-15 Memco Med Ltd Safety systems
US5008530A (en) * 1986-12-09 1991-04-16 Erwin Sick Gmbh Optik-Elektronik Autocollimation light curtain
US5038488A (en) * 1988-10-04 1991-08-13 Carl-Zeiss-Stiftung Protective arrangement for a longitudinally extendible machine component

Families Citing this family (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2283494A2 (en) * 1974-09-02 1976-03-26 Cometa Photoelectric scanning of control zone - by comparing count signals with scanning switch states to decide if scanning continues
DE2508366C3 (en) 1975-02-26 1979-05-17 Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch Optical device with a light curtain
DE2559947C3 (en) * 1975-02-26 1981-04-23 Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch Optical device with a light curtain
IT1044402B (en) * 1975-06-19 1980-03-20 Autostrade Concess Const SCANNING BARRIER FOR THE DISCRIMINATION AND COUNTING OF OBJECTS AND MORE SPECIFICALLY OF VEHICLES IN TRANSIT THROUGH A LAMINAR BARRIER OF ELECTROMAGNETIC MICROWAVES
US4260882A (en) * 1978-05-17 1981-04-07 Barnes Austen B Light sensitive detection circuit
DE2851444C2 (en) * 1978-11-28 1983-05-26 Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch Light curtain
SE428250B (en) * 1979-05-31 1983-06-13 Bert Jonsson PHOTOELECTRIC DEVICE FOR SENSING FORM
US4286880A (en) * 1979-07-30 1981-09-01 The Bendix Corporation Scanning light beam lumber defect position system and method of using same
ES8201716A1 (en) * 1979-09-10 1981-12-16 Gordon Ambler Kenneth Safety mechanism for industrial machinery.
DE2941739C2 (en) * 1979-10-16 1982-02-18 Krohne Meßtechnik GmbH & Co KG, 4100 Duisburg Light curtain
DE2944588C2 (en) * 1979-11-05 1981-11-12 Krohne Meßtechnik GmbH & Co KG, 4100 Duisburg Light curtain
WO1982002787A1 (en) * 1981-02-10 1982-08-19 Gray John E Photoelectric obstruction detector for elevator doorways
JPS59163093U (en) * 1983-04-18 1984-10-31 積水ハウス株式会社 window lattice
FR2574200B1 (en) * 1984-11-30 1987-01-23 Labo Electronique Physique DEVICE FOR DETECTING AN INTRUDER PROVIDED WITH AN ANTI-MASKING DEVICE
DE3447131A1 (en) * 1984-12-22 1986-06-26 Telenot Electronic GmbH, 7080 Aalen ROOM PROTECTION SYSTEM
US4652205A (en) * 1985-05-02 1987-03-24 Robotic Vision Systems, Inc. Robot cell safety system
US4736097A (en) * 1987-02-02 1988-04-05 Harald Philipp Optical motion sensor
DE3707978C1 (en) * 1987-03-12 1988-03-17 Sick Optik Elektronik Erwin Light curtain
DE3871525D1 (en) * 1988-01-27 1992-07-02 Harald Philipp MOTION DETECTOR.
US4879461A (en) * 1988-04-25 1989-11-07 Harald Philipp Energy field sensor using summing means
GB2238379A (en) * 1989-10-13 1991-05-29 John Trett Obstruction detection apparatus
US5354983A (en) * 1990-04-10 1994-10-11 Auto-Sense, Limited Object detector utilizing a threshold detection distance and suppression means for detecting the presence of a motor vehicle
DE4217696C2 (en) * 1992-05-27 1995-01-12 Mannesmann Ag Optoelectronic signal generator
US5572183A (en) * 1995-01-17 1996-11-05 Sweeney; Gary L. Laser light fire evacuation system
US5838238A (en) * 1996-03-13 1998-11-17 The Johns Hopkins University Alarm system for blind and visually impaired individuals
US7167575B1 (en) 2000-04-29 2007-01-23 Cognex Corporation Video safety detector with projected pattern
US6701005B1 (en) 2000-04-29 2004-03-02 Cognex Corporation Method and apparatus for three-dimensional object segmentation
DE60326558D1 (en) 2002-04-19 2009-04-23 Hill Rom Services Inc DEVICE FOR HOSPITAL BEDS FOR THE PERCEPTION OF OBSTACLES
US6987259B2 (en) * 2002-05-30 2006-01-17 Dmetrix, Inc. Imaging system with an integrated source and detector array
US8381747B2 (en) * 2010-12-16 2013-02-26 The Boeing Company Automated cleaning system for an aircraft fuselage interior
DE102016121204A1 (en) * 2016-11-07 2018-05-09 Pepperl + Fuchs Gmbh Optical sensor
DE102016121913A1 (en) * 2016-11-15 2018-05-17 Sick Ag Multibeam light barrier
US11406548B2 (en) 2018-09-27 2022-08-09 Hill-Rom Services, Inc. Obstacle detection IR beam filter

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2930898A (en) * 1956-09-11 1960-03-29 W D Engineering Co Ltd Cathode ray tube apparatus for the inspection of articles
US3293513A (en) * 1962-08-08 1966-12-20 Texas Instruments Inc Semiconductor radiant diode
DE2007840C3 (en) * 1970-02-20 1979-11-15 Endl, Alfons, 8000 Muenchen Light barrier
US3764813A (en) * 1972-04-12 1973-10-09 Bell Telephone Labor Inc Coordinate detection system

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2171195A (en) * 1985-02-15 1986-08-20 Alps Electric Co Ltd Photoelectric touch panels
DE3604731A1 (en) * 1985-02-15 1986-08-21 Alps Electric Co Ltd PHOTOELECTRIC INPUT LIGHT BARRIER PANEL
GB2177503A (en) * 1985-06-12 1987-01-21 John Peter Hughes Guard system
US5008530A (en) * 1986-12-09 1991-04-16 Erwin Sick Gmbh Optik-Elektronik Autocollimation light curtain
GB2207999A (en) * 1987-08-13 1989-02-15 Memco Med Ltd Safety systems
GB2207999B (en) * 1987-08-13 1992-04-22 Memco Med Ltd Safety systems
US5038488A (en) * 1988-10-04 1991-08-13 Carl-Zeiss-Stiftung Protective arrangement for a longitudinally extendible machine component
US5111591A (en) * 1988-10-04 1992-05-12 Carl-Zeiss-Stiftung Protective arrangement for a longitudinally extendible machine component
GB2255810A (en) * 1988-10-04 1992-11-18 Zeiss Stiftung A protective arrangement for a longitudinally-extendible machine component
GB2255810B (en) * 1988-10-04 1993-02-03 Zeiss Stiftung Protective arrangement for longitudinally extended machine components
GB2223557B (en) * 1988-10-04 1993-02-03 Zeiss Stiftung Protective arrangement for longitudinally extended machine components

Also Published As

Publication number Publication date
CH558060A (en) 1975-01-15
DE2247053C3 (en) 1979-08-09
DE2247053B2 (en) 1978-12-07
US3858043A (en) 1974-12-31
JPS5527315B2 (en) 1980-07-19
SE391249B (en) 1977-02-07
IT993021B (en) 1975-09-30
JPS4971980A (en) 1974-07-11
DE2247053A1 (en) 1974-05-22

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLE Entries relating assignments, transmissions, licences in the register of patents
PCNP Patent ceased through non-payment of renewal fee