GB1454386A - Traffic signal devices - Google Patents

Traffic signal devices

Info

Publication number
GB1454386A
GB1454386A GB5722673A GB5722673A GB1454386A GB 1454386 A GB1454386 A GB 1454386A GB 5722673 A GB5722673 A GB 5722673A GB 5722673 A GB5722673 A GB 5722673A GB 1454386 A GB1454386 A GB 1454386A
Authority
GB
United Kingdom
Prior art keywords
signal
switched
lamps
dec
lens
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
GB5722673A
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.)
GEC Elliott Traffic Automation Ltd
Original Assignee
GEC Elliott Traffic Automation Ltd
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 GEC Elliott Traffic Automation Ltd filed Critical GEC Elliott Traffic Automation Ltd
Priority to GB5722673A priority Critical patent/GB1454386A/en
Publication of GB1454386A publication Critical patent/GB1454386A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/08—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for producing coloured light, e.g. monochromatic; for reducing intensity of light
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/095—Traffic lights
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2111/00—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
    • F21W2111/02—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00 for roads, paths or the like

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Traffic Control Systems (AREA)

Abstract

1454386 Signal lamps GEC-ELLIOTT TRAFFIC AUTOMATION Ltd 10 Dec 1974 [10 Dec 1973] 57226/73 Heading F4R In a traffic signal device, phantom signals are prevented by an electro-optical shutter arrangement which operates when the signal is switched off. The shutter may be an array of liquid crystal cells electrically interconnected or a single large cell, located between the reflector and the lens, optionally combined with the lens. Where two or more signal lamps are mounted on a common head, the current to a lamp which is switched on also provides the field which changes the cells of the other lamps from a translucent to an opaque state. In an alternative embodiment, the signal lamp is permanently on, the signal being switched on and off by the shutter arrangement.
GB5722673A 1973-12-10 1973-12-10 Traffic signal devices Expired GB1454386A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5722673A GB1454386A (en) 1973-12-10 1973-12-10 Traffic signal devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5722673A GB1454386A (en) 1973-12-10 1973-12-10 Traffic signal devices

Publications (1)

Publication Number Publication Date
GB1454386A true GB1454386A (en) 1976-11-03

Family

ID=10478672

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5722673A Expired GB1454386A (en) 1973-12-10 1973-12-10 Traffic signal devices

Country Status (1)

Country Link
GB (1) GB1454386A (en)

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19941209