EP0319621A1 - Source lumineuse - Google Patents

Source lumineuse Download PDF

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Publication number
EP0319621A1
EP0319621A1 EP87310865A EP87310865A EP0319621A1 EP 0319621 A1 EP0319621 A1 EP 0319621A1 EP 87310865 A EP87310865 A EP 87310865A EP 87310865 A EP87310865 A EP 87310865A EP 0319621 A1 EP0319621 A1 EP 0319621A1
Authority
EP
European Patent Office
Prior art keywords
light
light source
lens
source according
annular 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.)
Withdrawn
Application number
EP87310865A
Other languages
German (de)
English (en)
Inventor
Peter Roger Pearce-Harvey
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.)
PEARCE HARVEY PETER ROGER
Original Assignee
PEARCE HARVEY PETER ROGER
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
Priority to GB8613187A priority Critical patent/GB2191572B/en
Application filed by PEARCE HARVEY PETER ROGER filed Critical PEARCE HARVEY PETER ROGER
Priority to EP87310865A priority patent/EP0319621A1/fr
Publication of EP0319621A1 publication Critical patent/EP0319621A1/fr
Withdrawn legal-status Critical Current

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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
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F21V5/046—Refractors for light sources of lens shape the lens having a rotationally symmetrical shape about an axis for transmitting light in a direction mainly perpendicular to this axis, e.g. ring or annular lens with light source disposed inside the ring
    • 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
    • F21V11/16—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using sheets without apertures, e.g. fixed
    • F21V11/18—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using sheets without apertures, e.g. fixed movable, e.g. flaps, slides

Definitions

  • the present invention relates to a light source.
  • the source radiates its light throughout a 360° arc.
  • One of the traditional ways of producing a very intense light is to use, as the source of light, an arc which may be a conventional carbon arc or a xenon arc or like.
  • an arc which may be a conventional carbon arc or a xenon arc or like.
  • optical systems include mirrored reflectors, aspherical lenses, and combinations of these.
  • a light source assembly comprising a source of light, an annular lens surrounding said source and having its axis substantially at the location of said source, said annular lens being effective to produce a radial disc of light extending outwardly therefrom.
  • the inner surface can have a number of different shapes, it is preferably a cylindrical inner surface.
  • the outer surface can, for example, be aspherical so as to produce a radial disc of light having substantially parallel, radial, planar sides.
  • the outer surface of the annular lens could be provided with a plurality of facets, at least one of which could be coloured.
  • means are provided, surrounding said annular lens, to reflect or refract the disc of light to form a beam having its axis extending in a direction generally parallel to the axis of the beam, advantageously, so as to form a substantially parallel sided beam or beam convergent to a point along the axis of the beam.
  • These means could comprise a mirror or lens having a conical reflective, or internally reflective surface, the cone angle of the surface being 45°.
  • these means could comprise a mirror having a parabolic or elliptical reflective or internal reflective surface.
  • the point of focus 'P' above may be changed by moving the parabolic reflector along the axis of the light source. In most instances, it would be preferable to provide a focusing lens upon which this beam of light is incident.
  • the dimming can be achieved by means of a tube of material, such as a coloured translucent material or a screen, is axially movable within said annular lens closely adjacent to the radially inner surface thereof.
  • the light source assembly shown in the Figure includes a conventional carbon arc or xenon source of light 10 having an arc produced at the point 12.
  • the axis of the light source 10 is shown at 14.
  • annular aspherical lens 16 Coaxially mounted around the light source 10 is an annular aspherical lens 16 having a cylindrical inner surface 18 and an aspherical outer surface 20.
  • a conical mirror 22 Positioned again coaxially with the light source, and surrounding the annular lens 16 is a conical mirror 22 having a conical reflective surface 24 subtending a cone angle of 45°, i.e. an apex angle of 90°.
  • a focusing lens 26 Positioned to the right, in the drawing, of the light source is a focusing lens 26.
  • the light source is shown as emanating, from its centre 12, rays 28 of which about 50% are incident on the inner cylindrical surface 18 of the annular lens 16.
  • the design of the lens is such as to produce a radially outwardly extending disc 28 of light having parallel, planar side surfaces 30 and 32. This disc is incident on the reflective surface 24 which reflects the disc to form a beam 34 which is parallel sided and coaxial with the the system. This parallel sided beam 34 is incident upon the focusing lens 26 which can be used to focus the beam as desired.
  • the inner surface of the lens 18 has been shown as cylindrical, it is contemplated that it could be other than cylindrical and indeed could be polygonal.
  • the outer surface could be provided with a plurality of facets, at least some of which could be coloured, for example, so as to produce interesting light effects in the beam 34 to be focused by the lens 26.
  • total internal reflection could be achieved using a lens system surrounding the annular lens 16.
  • the intensity of light can be varied by moving a cylindrical dimming tube 40 axially within the annular lens 16 with its outer surface closely adjacent the inner cylindrical surface 18 of the lens.
  • This dimming tube may be of coloured, e.g. grey, translucent material or may include a light intensity reducing screen.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Projection Apparatus (AREA)
EP87310865A 1986-05-30 1987-12-10 Source lumineuse Withdrawn EP0319621A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB8613187A GB2191572B (en) 1986-05-30 1986-05-30 Light source assembly
EP87310865A EP0319621A1 (fr) 1987-12-10 1987-12-10 Source lumineuse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87310865A EP0319621A1 (fr) 1987-12-10 1987-12-10 Source lumineuse

Publications (1)

Publication Number Publication Date
EP0319621A1 true EP0319621A1 (fr) 1989-06-14

Family

ID=8198131

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87310865A Withdrawn EP0319621A1 (fr) 1986-05-30 1987-12-10 Source lumineuse

Country Status (1)

Country Link
EP (1) EP0319621A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191025285A (en) * 1910-10-31 1911-09-07 William James Harvey Improvements in or relating to Lamps.
US2226300A (en) * 1938-09-26 1940-12-24 American Sterilizer Co Removable optical system for luminaires
GB611032A (en) * 1945-01-25 1948-10-25 Raleigh Cycle Company Ltd Improvements in directional beam electric lamps
FR1228846A (fr) * 1959-01-30 1960-09-02 Anciens Ets Barbier Perfectionnements aux appareils d'éclairage chirurgical sans ombres
FR2372380A1 (fr) * 1976-11-30 1978-06-23 Barbier Benard & Turenne Appareil d'eclairage sans ombres portees
GB2191572A (en) * 1986-05-30 1987-12-16 Pearce Harvey Peter Roger Light source comprising an annular lens

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191025285A (en) * 1910-10-31 1911-09-07 William James Harvey Improvements in or relating to Lamps.
US2226300A (en) * 1938-09-26 1940-12-24 American Sterilizer Co Removable optical system for luminaires
GB611032A (en) * 1945-01-25 1948-10-25 Raleigh Cycle Company Ltd Improvements in directional beam electric lamps
FR1228846A (fr) * 1959-01-30 1960-09-02 Anciens Ets Barbier Perfectionnements aux appareils d'éclairage chirurgical sans ombres
FR2372380A1 (fr) * 1976-11-30 1978-06-23 Barbier Benard & Turenne Appareil d'eclairage sans ombres portees
GB2191572A (en) * 1986-05-30 1987-12-16 Pearce Harvey Peter Roger Light source comprising an annular lens

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Effective date: 19891215