GB1438639A - Indicator panels - Google Patents

Indicator panels

Info

Publication number
GB1438639A
GB1438639A GB4981972A GB4981972A GB1438639A GB 1438639 A GB1438639 A GB 1438639A GB 4981972 A GB4981972 A GB 4981972A GB 4981972 A GB4981972 A GB 4981972A GB 1438639 A GB1438639 A GB 1438639A
Authority
GB
United Kingdom
Prior art keywords
panel
light
indicia
ridges
oct
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
GB4981972A
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.)
Lucas Electrical Co Ltd
Original Assignee
Lucas Electrical Co 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 Lucas Electrical Co Ltd filed Critical Lucas Electrical Co Ltd
Priority to GB4981972A priority Critical patent/GB1438639A/en
Priority to AU61438/73A priority patent/AU481778B2/en
Priority to IN2320/CAL/73A priority patent/IN139638B/en
Priority to FR7337835A priority patent/FR2205245A5/fr
Priority to JP48120075A priority patent/JPS4977650A/ja
Priority to DE19732353712 priority patent/DE2353712A1/en
Priority to IT5336573A priority patent/IT996335B/en
Publication of GB1438639A publication Critical patent/GB1438639A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0018—Redirecting means on the surface of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0028—Light guide, e.g. taper
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/006—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to produce indicia, symbols, texts or the like
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0095—Light guides as housings, housing portions, shelves, doors, tiles, windows, or the like

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Details Of Measuring And Other Instruments (AREA)

Abstract

1438639 Illuminated signs LUCAS ELECTRICAL CO Ltd 9 Oct 1973 [28 Oct 1972] 49819/72 Heading G5C An indicator panel 11 for use in a road vehicle instrument panel is formed from light conductive material having an inclined end surface 13 by which light entering the panel is reflected down to opposed reflecting surfaces 14, 15 which return the light back along the panel interior. The double passage of light inside the panel gives even illumination of symbols or indicia on ridges 12. The panel may be used in a housing 16 adjacent a switch whose four positions are shown by the indicia on ridges 12. The light input for surface 13 may be from a lightpipe cable plugged into a socket in housing 16.
GB4981972A 1972-10-28 1972-10-28 Indicator panels Expired GB1438639A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
GB4981972A GB1438639A (en) 1972-10-28 1972-10-28 Indicator panels
AU61438/73A AU481778B2 (en) 1972-10-28 1973-10-16 Indicator panels
IN2320/CAL/73A IN139638B (en) 1972-10-28 1973-10-18
FR7337835A FR2205245A5 (en) 1972-10-28 1973-10-24
JP48120075A JPS4977650A (en) 1972-10-28 1973-10-26
DE19732353712 DE2353712A1 (en) 1972-10-28 1973-10-26 DISPLAY BOARD
IT5336573A IT996335B (en) 1972-10-28 1973-10-26 INDICATOR PANEL AND DEVICE THAT INCLUDES IT IN PARTICULAR FOR MOTOR VEHICLES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4981972A GB1438639A (en) 1972-10-28 1972-10-28 Indicator panels

Publications (1)

Publication Number Publication Date
GB1438639A true GB1438639A (en) 1976-06-09

Family

ID=10453657

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4981972A Expired GB1438639A (en) 1972-10-28 1972-10-28 Indicator panels

Country Status (6)

Country Link
JP (1) JPS4977650A (en)
DE (1) DE2353712A1 (en)
FR (1) FR2205245A5 (en)
GB (1) GB1438639A (en)
IN (1) IN139638B (en)
IT (1) IT996335B (en)

Also Published As

Publication number Publication date
IN139638B (en) 1976-07-10
FR2205245A5 (en) 1974-05-24
JPS4977650A (en) 1974-07-26
DE2353712A1 (en) 1974-05-02
IT996335B (en) 1975-12-10
AU6143873A (en) 1975-04-17

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Legal Events

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