IT1245207B - Sistema a schermo di luce capace di autoverifica e metodo di funzionamento relativo - Google Patents

Sistema a schermo di luce capace di autoverifica e metodo di funzionamento relativo

Info

Publication number
IT1245207B
IT1245207B ITMI910029A ITMI910029A IT1245207B IT 1245207 B IT1245207 B IT 1245207B IT MI910029 A ITMI910029 A IT MI910029A IT MI910029 A ITMI910029 A IT MI910029A IT 1245207 B IT1245207 B IT 1245207B
Authority
IT
Italy
Prior art keywords
light
self
circuits
screen system
light screen
Prior art date
Application number
ITMI910029A
Other languages
English (en)
Inventor
David Blau
Original Assignee
Scient Technologies Inc
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 Scient Technologies Inc filed Critical Scient Technologies Inc
Publication of ITMI910029A0 publication Critical patent/ITMI910029A0/it
Publication of ITMI910029A1 publication Critical patent/ITMI910029A1/it
Application granted granted Critical
Publication of IT1245207B publication Critical patent/IT1245207B/it

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
    • 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
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F15/00—Power-operated mechanisms for wings
    • E05F15/40—Safety devices, e.g. detection of obstructions or end positions
    • E05F15/42—Detection using safety edges
    • E05F15/43—Detection using safety edges responsive to disruption of energy beams, e.g. light or sound
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F15/00—Power-operated mechanisms for wings
    • E05F15/40—Safety devices, e.g. detection of obstructions or end positions
    • E05F15/42—Detection using safety edges
    • E05F15/43—Detection using safety edges responsive to disruption of energy beams, e.g. light or sound
    • E05F2015/434—Detection using safety edges responsive to disruption of energy beams, e.g. light or sound with cameras or optical sensors
    • E05F2015/435—Detection using safety edges responsive to disruption of energy beams, e.g. light or sound with cameras or optical sensors by interruption of the beam

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Mechanical Engineering (AREA)
  • Burglar Alarm Systems (AREA)
  • Electronic Switches (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

Sistema a schermo di luce che rileva l'introduzione di oggetti in una zona protetta caratterizzato dall'avere un modo di funzionamento capace di autoverifica tramite circuiti logici che analizzano i segnali dei dati dai circuiti sia trasmettitori di luce con LED che ricevitori con fototransistor. Viene generato un segnale di disattivazione se il circuito logico determina che la luce non viene ricevuta in un canale scelto nel momento in cui il LED sta inviando luce esclusivamente a quel canale. Il sistema inoltre fornisce un metodo relativamente semplice ed economico per scegliere ed amplificare i trasmettitori LED e i ricevitori PT. Nel circuito ciascun PT agisce come interruttore che sceglie da solo ed un singolo amplificatore viene impiegato per una pluralità di canali.Il circuito inoltre provvede alla concatenazione di gruppo di circuiti amplificatori/PT all'interno di una catena più lunga usando un singolo diodo.
ITMI910029A 1990-01-09 1991-01-09 Sistema a schermo di luce capace di autoverifica e metodo di funzionamento relativo IT1245207B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07463240 US5015840B1 (en) 1990-01-09 1990-01-09 Self-checking light curtain system and method of operation.

Publications (3)

Publication Number Publication Date
ITMI910029A0 ITMI910029A0 (it) 1991-01-09
ITMI910029A1 ITMI910029A1 (it) 1992-07-09
IT1245207B true IT1245207B (it) 1994-09-13

Family

ID=23839416

Family Applications (1)

Application Number Title Priority Date Filing Date
ITMI910029A IT1245207B (it) 1990-01-09 1991-01-09 Sistema a schermo di luce capace di autoverifica e metodo di funzionamento relativo

Country Status (5)

Country Link
US (1) US5015840B1 (it)
DE (1) DE4100280C2 (it)
FR (1) FR2656914B1 (it)
GB (1) GB2242742B (it)
IT (1) IT1245207B (it)

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Also Published As

Publication number Publication date
GB2242742B (en) 1994-07-13
FR2656914A1 (fr) 1991-07-12
FR2656914B1 (fr) 1993-07-23
GB2242742A (en) 1991-10-09
GB9100156D0 (en) 1991-02-20
ITMI910029A0 (it) 1991-01-09
ITMI910029A1 (it) 1992-07-09
DE4100280C2 (de) 2003-12-24
US5015840A (en) 1991-05-14
DE4100280A1 (de) 1991-07-11
US5015840B1 (en) 1995-04-11

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