GB1291563A - Illumination sources - Google Patents

Illumination sources

Info

Publication number
GB1291563A
GB1291563A GB5305768A GB5305768A GB1291563A GB 1291563 A GB1291563 A GB 1291563A GB 5305768 A GB5305768 A GB 5305768A GB 5305768 A GB5305768 A GB 5305768A GB 1291563 A GB1291563 A GB 1291563A
Authority
GB
United Kingdom
Prior art keywords
semi
light
source
illumination
diffusing element
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
GB5305768A
Inventor
Roger A Whitney
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.)
Kodak Ltd
Original Assignee
Kodak 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 Kodak Ltd filed Critical Kodak Ltd
Priority to GB5305768A priority Critical patent/GB1291563A/en
Publication of GB1291563A publication Critical patent/GB1291563A/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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)

Abstract

1291563 Lamps KODAK Ltd 30 Oct 1969 [8 Nov 1968] 53057/68 Heading F4R A linear illumination radiating device comprises a transparent elongate member 10 having substantially plane end surfaces one of which is intended to be located adjacent a source of illumination and the other of which has reflecting properties, a longitudinally extending light diffusing element 11, such as a stripe of matt white paint, being provided on a portion of the side surface of the member so that light which enters the end of the member adjacent the source is diffusively reflected by the element 11 and emerges through another portion 15 of the side surface of the member. In the embodiment illustrated in Fig. 2 the member has three plane side faces 11a, 12, 13, all of width 2R, and a semi-cylindrical side face 15 of radius R which acts as a lens to focus the light reflected by the element 11 into a parallel beam. Various alternative cross-sectional shapes are contemplated for the member : it may, for example, have a cross-section in the form of a nearly triangular trapezium with the diffusing element at the apex. Alternatively, the surface 15 may be replaced by a cylinder of semi-elliptical section (Fig. 3) and the surfaces 12, 13 by silvered circular arcs.
GB5305768A 1968-11-08 1968-11-08 Illumination sources Expired GB1291563A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5305768A GB1291563A (en) 1968-11-08 1968-11-08 Illumination sources

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5305768A GB1291563A (en) 1968-11-08 1968-11-08 Illumination sources

Publications (1)

Publication Number Publication Date
GB1291563A true GB1291563A (en) 1972-10-04

Family

ID=10466462

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5305768A Expired GB1291563A (en) 1968-11-08 1968-11-08 Illumination sources

Country Status (1)

Country Link
GB (1) GB1291563A (en)

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees