WO2000036338A1 - Dispositif electroluminescent - Google Patents

Dispositif electroluminescent Download PDF

Info

Publication number
WO2000036338A1
WO2000036338A1 PCT/GB1999/004197 GB9904197W WO0036338A1 WO 2000036338 A1 WO2000036338 A1 WO 2000036338A1 GB 9904197 W GB9904197 W GB 9904197W WO 0036338 A1 WO0036338 A1 WO 0036338A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
conducting element
light conducting
hollow member
containment
Prior art date
Application number
PCT/GB1999/004197
Other languages
English (en)
Inventor
William John Baillie-Hamilton
Original Assignee
Fibre Optic Lamp Company
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 Fibre Optic Lamp Company filed Critical Fibre Optic Lamp Company
Publication of WO2000036338A1 publication Critical patent/WO2000036338A1/fr

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
    • G02B6/0005—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 of the fibre type
    • G02B6/0006—Coupling light into the fibre
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/025—Associated optical elements

Definitions

  • This invention relates to a light emitting device.
  • a light emitting device where light emitted from a source thereof is efficiently gathered for transmission along a light conducting element.
  • Such devices have a wide range of applications and some impose design limitations arising from at least one of the following: small size, generated heat, containment, manufacturing problems, vandalism, lamp replacement, linkage to light using or transmitting devices.
  • a light outputting device comprising: a containment for housing an element for emitting light; at least one axially extending light conducting element having an axial length substantially greater than its width transverse the axis; the light conducting element being aligned axially with the element for emitting light by means of the containment or an extension thereof; the, or each, light conducting element having a light input region such as an end face whereby light generated by the element for emitting light is caused to pass axially into the, or each, light conducting element by way of its associated light input region.
  • the containment or an extension thereof serves to locate the element for emitting light closer to the light input region of the, or each, light conducting element than to the major part of the containment remote from the light input region or regions.
  • the light outputting device incorporates a reflector located relative to the element for emitting light and the, or at least one, light conducting element so as to reflect light from the element for emitting light axially into the, or at least one, light conducting element by way of its associated light input region.
  • the International Application goes on to disclose a method of fabricating such a device is characterised by the steps of: providing the light conducting element in the form of a longitudinal member with end faces and an outer surface apart from the end faces; locating around the light conducting element a sleeve member of greeter length than the light conducting element with its first end of the light conducting element at or near one end of the sleeve so as to leave a length of sleeve projecting beyond the opposite end of the light conducting element to the first end ; the opposite end of the light conducting element to the first end forming, at least in part, the light input region; causing the sleeve member to be contiguously juxtaposed with the outer surface of the light conducting element; locating the element for emitting light in the length of sleeve projecting beyond the opposite end; deforming the length of sleeve so as to form together with the light input region of the light conducting element the containment for the element for emitting light; and sealing the deformed length of the tube to cause the containment to
  • a method of fabricating a light outputting device made up of a containment for housing an element for emitting light; an axially extending light conducting element having an axial length substantially greater than its width transverse the axis; the light conducting element being aligned axially with the element for emitting light by means of the containment or an extension thereof; the light conducting element having a light input region such as an end face whereby light generated by the element for emitting light is caused to pass axially into the light conducting element by way of its associated light input region, the method being characterised by the steps of:
  • the light conducting element in the form of a longitudinal member with a first longitudinal axis and a given cross section, such as a circular cross section having a given diameter and an end face forming a light input region;
  • the step of locating the element for emitting light within the hollow member includes locating a mirror for reflecting light generated by the element to provide for the mirror to be enclosed with the element prior to the deforming an sealing steps.
  • a light outputting device manufactures by the method of the first aspect or of the first preferred version thereof.
  • Figure 1 is a side view
  • Figure 2 a plan view of a first embodiment of a light emitting device
  • Figure 3 is a plan view showing in more detail a component referred to in connection with Figures 1 and 2;
  • Figure 4 shows further embodiments of a light emitting device incorporating a mirror reflector of which Figure 4 shows a plane mirror; Figure 5 shows a parabolic mirror; and Figure 6 shows a cylindrical mirror.
  • Light emitting device 11 includes a solid light conducting member 12 (about 25 mm long) of quartz with a circular cross section of outside diameter D (of about 10mm) and having a longitudinal axis A.
  • the member 12 has an end face 13 of which the central region forms a light input region R.
  • the device 11 further includes a hollow tube 15 which prior to a deformation step during fabrication of the device 11 is a tube about 25 mm long) of circular cross section with longitudinal axis of symmetry A2 as shown over undeformed length C ( Figure 1).
  • This circular section has an outside diameter D' identical to that of the member 12.
  • the undeformed tube is presented to end face 13 of the member 12 so that axis A, A2 are in line and the ends of the two components are fused as a butt joint on section E.
  • a tungsten element 20 in the form shown in Figure 3 with coiled section 21 and conductors 22, 23 is introduced into the hollow tube 15 and located with coiled filament 21 at a predetermined distance from the end face 13.
  • Ends 22A, 23A of, respectively, conductors 22, 23 are attached to molybdenum foil strips, respectively 22B, 23B, which are in turn connected to, respectively, contact pins 22C, 23C by means of which the filament is energised.
  • the device 11 can be used in a range of applications which will determine whether the containment 25 is evacuated or contains an inert gas or gases.
  • Figures 4, 5 and 6
  • the device 11 contains a tungsten coil filament 21 alone in containment 25.
  • applications in which the device 11 is used can benefit from the use of a reflector or mirror which is installed at the time of fabricating the device at the step of locating the light emitting device in the as yet undeformed tube.
  • Figure 4 shows in outline a light emitting device 41 similar in form and function to that of device 11 in Figures 1 and 2 saving for the provision of a plane mirror 42 transverse longitudinal axis A2 and facing end face 43 of light conducting member 44.
  • the mirror 42 is shown sideways on spaced from filament 45 but viewed from the front the mirror 42 is of circular shape.
  • the mirror 42 is of tungsten with a surface of high reflectivity.
  • the plane mirror 42 forms a virtual image of the filament 45 as far behind the mirror on axis A2 as the filament 45 is in front of the mirror.
  • the combined effects of low mirror reflectivity and the distance of the virtual image from end face 43 of the light conducting member 44 will result in only a small fraction of the light from the rear side of the filament 45 reaching back end 47 of containment 48.
  • Figure 5 A (plan view), 5B (side view) show in outline a light emitting device 51 similar to device 11 of Figures 1 and 2 saving for the provision of a parabolic mirror 52 transverse longitudinal axis A2 and facing towards end face 53 of light conducting member 54.
  • the mirror 52 is appropriately spaced from end face 53.
  • the use of a parabolic mirror 52 provides significant optical advantages and in particular the normal incidence of the reflected light onto the end face 53 of the light conducting member 44. This could give a theoretical 50% improvement in transmitted light.
  • Filament 55 (corresponding in form and function to filament 21 of Figuresl to 3 described above) is located at the optical focus of the parabolic mirror 52.
  • Figure 6A plan view
  • 6B side view
  • the mirror 62 is appropriately spaced from end face 63.
  • the use of a cylindrical mirror 62 acts to redirect light on to filament 65 when the filament 65 is placed at the centre of curvature of the mirror 62.
  • the filament 65 could usefully be off set from the centre of curvature so that in effect a real image of the filament generated by the mirror 62 is located symmetrically with filament 65 on opposite sides of the axis A2 and at the same distance from face 63.
  • the light emitting device of the present invention can incorporate most available means of light generation and in particular gas discharge and bright arc where a sold is vapourised within the enclosure to give a bright arc with subsequent vapour condensation when the power supply is removed.
  • the present invention also envisages the use of coatings for the devices to govern optical behaviour and also for the use of doped silicon substrates to promote colour or other requirements.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

La présente invention concerne un procédé de fabrication de dispositif électroluminescent (11) constitué d'une structure destinée à loger un élément électroluminescent, et d'un élément photoconducteur s'étendant axialement et présentant une longueur axiale sensiblement supérieure à sa largeur sur l'axe transversal. Cet élément photoconducteur (12) est aligné axialement avec l'élément électroluminescent grâce à la structure précitée ou à une extension de celle-ci. L'élément photoconducteur (12) comporte une région d'entrée de lumière (R), telle qu'une face d'extrémité (13), par laquelle la lumière générée par l'élément électroluminescent est amenée à passer axialement dans l'élément photoconducteur (12).
PCT/GB1999/004197 1998-12-15 1999-12-15 Dispositif electroluminescent WO2000036338A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9827538.1 1998-12-15
GB9827538A GB2346733A (en) 1998-12-15 1998-12-15 Making a light-outputting device

Publications (1)

Publication Number Publication Date
WO2000036338A1 true WO2000036338A1 (fr) 2000-06-22

Family

ID=10844218

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/004197 WO2000036338A1 (fr) 1998-12-15 1999-12-15 Dispositif electroluminescent

Country Status (2)

Country Link
GB (1) GB2346733A (fr)
WO (1) WO2000036338A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997040520A1 (fr) * 1996-04-23 1997-10-30 Baillie Hamilton William John Dispositif emetteur de lumiere et ensembles correspondants

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997040520A1 (fr) * 1996-04-23 1997-10-30 Baillie Hamilton William John Dispositif emetteur de lumiere et ensembles correspondants

Also Published As

Publication number Publication date
GB9827538D0 (en) 1999-02-10
GB2346733A (en) 2000-08-16

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