GB2023282A - A light-curtain means - Google Patents
A light-curtain meansInfo
- 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
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>
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)
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)
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 |
-
1978
- 1978-04-10 SE SE7803985A patent/SE418426B/en unknown
-
1979
- 1979-04-09 DE DE19792914329 patent/DE2914329A1/en not_active Withdrawn
- 1979-04-09 GB GB7912351A patent/GB2023282B/en not_active Expired
- 1979-04-10 JP JP4409979A patent/JPS554690A/en active Pending
- 1979-04-10 NO NO791203A patent/NO791203L/en unknown
- 1979-04-10 DK DK149979A patent/DK149979A/en not_active IP Right Cessation
Cited By (28)
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 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB2023282A (en) | A light-curtain means | |
US3928849A (en) | Intrusion detector self-test system | |
GB921644A (en) | Method of and apparatus for detecting blood in eggs | |
SE7605637L (en) | SAFETY COUPLING, SEPARATE FOR ELEVATORS | |
JPS573573A (en) | Digital phase control device | |
SU577470A1 (en) | Arrangement for determining extreme values of sinusoidal signal | |
JPS56106162A (en) | Pulse detector | |
JPS5246458A (en) | Abnormal detector of machinery and apparatuses | |
JPS5455179A (en) | Integrated circuit package | |
SU426320A1 (en) | SWITCHING DEVICE | |
SU1552359A1 (en) | D-flip flop with self-check and safe failure | |
JPS5733368A (en) | Fault detector | |
SU750738A1 (en) | Device for monitoring counter operation | |
JPS55144699A (en) | X-ray automatic exposure controller | |
SU962953A1 (en) | Binary code checking device | |
US3316408A (en) | Light energized interrupter circuit for telephone systems | |
SU1275181A1 (en) | Protection arrangement to press | |
SU945870A2 (en) | Wiring testing device | |
SU397888A1 (en) | DEVICE FOR MEASURING IMAGE EXTENDERS | |
JPS564802A (en) | Failure detector for redundant feedback control circuit | |
JPS5714716A (en) | Position detector | |
FR2290717A1 (en) | Optical light barrier for security or measuring systems - has IR responsive optical detectors connected to logic circuits | |
JPS5486363A (en) | State change detecting circuit | |
SU769493A1 (en) | Device for diagnosis of faults of discrete objects | |
SU693115A1 (en) | Weak signal detector |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |