EP0005080B1 - Optique pour projecteur - Google Patents

Optique pour projecteur Download PDF

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Publication number
EP0005080B1
EP0005080B1 EP19790300700 EP79300700A EP0005080B1 EP 0005080 B1 EP0005080 B1 EP 0005080B1 EP 19790300700 EP19790300700 EP 19790300700 EP 79300700 A EP79300700 A EP 79300700A EP 0005080 B1 EP0005080 B1 EP 0005080B1
Authority
EP
European Patent Office
Prior art keywords
reflector
light
filament
facetted
reflecting means
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
EP19790300700
Other languages
German (de)
English (en)
Other versions
EP0005080A1 (fr
Inventor
Martin Warwick Moore
Roderick Alexander Mckenzie
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.)
Rank Organization Ltd
Original Assignee
Rank Organization 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 Rank Organization Ltd filed Critical Rank Organization Ltd
Publication of EP0005080A1 publication Critical patent/EP0005080A1/fr
Application granted granted Critical
Publication of EP0005080B1 publication Critical patent/EP0005080B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K7/00—Lamps for purposes other than general lighting
    • H01K7/02—Lamps for purposes other than general lighting for producing a narrow beam of light; for approximating a point-like source of light, e.g. for searchlight, for cinematographic projector
    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/0025—Combination of two or more reflectors for a single light source
    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/09—Optical design with a combination of different curvatures
    • 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
    • F21V11/08—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using diaphragms containing one or more apertures
    • F21V11/10—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using diaphragms containing one or more apertures of iris type
    • 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
    • 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
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40—Lighting for industrial, commercial, recreational or military use
    • F21W2131/406—Lighting for industrial, commercial, recreational or military use for theatres, stages or film studios

Definitions

  • This invention relates to a light projection system for a spotlight lantern.
  • a spotlight lantern is required to produce a well-defined beam of light having an even distribution of light through its cross-section.
  • a light source e.g. an electric filament
  • This combination is referred to herein as a light projection system.
  • the light projection system concentrates light through a gate, shaping pattern or iris (collectively referred to as a gate subsequently), and then through an optical objective, in order to produce the required beam.
  • the object in designing the light projection system is uniformly to fill the gate, pattern or iris with light so that as much light as possible is concentrated by the objective to produce the required uniform, well-defined beam having a minimum of light spill at its edges.
  • U.S. Patent No. 3,930,149 discloses a lighting device of adjustable intensity and intended for use in dentistry, wherein a lamp has a coil filament backed by an ellipsoidal reflector and a light gate which is just filled with light in the position of maximum intensity and is axially movable to reduce intensity.
  • the object of the present invention is to provide an improved light projection system which is suitable for the European 220/240 volts mains supply which avoids substantial waste light and non-uniform light distribution at the gate.
  • a light projection system for a spotlight lantern comprising a filament lamp and a concave reflecting means from which filament radiated light is reflected through a gate to an optical objective in order to form the spotlight beam, the lamp having a flat elongate grid filament disposed axially on the axis of the reflecting means, characterised in that said reflecting means has facets each of which produces a patch of light which just fills the gate.
  • the reflecting means preferably comprises a rear reflector in the form of a partial surface of revolution defined by a large plurality of facets. These facets may cover the reflector regularly or irregularly.
  • a partial frontal reflector may be employed in addition. This may also be facetted, but alternatively may be spherical or hyperbolic. A spherical rear reflector may be employed when the frontal reflector is facetted.
  • each reflector facet in use produces a patch of light which just fills the gate.
  • Figures 1 to 3 respectively show three differing reflector arrangements which may be employed in conjunction with an axial grid filament
  • Figures 4 and 5 show constructional details of a facetted rear reflector.
  • the arrangement shown in Figure 1 comprises a 220/240 volt lamp 10 having a flat elongate grid filament 11.
  • a 220/240 volt lamp 10 having a flat elongate grid filament 11.
  • Such a lamp has a conventional cylindrical envelope, but in accordance with the invention the grid filament 11 extends axially, lying along the axis of the envelope, which is collinear with the optical axis 0 of the lantern.
  • the lamp 10 is mounted longitudinally on the axis of a cup-shaped rear reflector 12, which axis is also collinear with the optical axis 0.
  • the surface of the reflector 12 generally conforms to a conic section such as a paraboloid or an ellipsoid.
  • An aperture is provided at the centre of the rear reflector 12 to accommodate the lamp 10 extending axially therethrough, so that the grid filament 11 is disposed along the axis of revolution of the reflector.
  • the reflector is more exactly defined by a large plurality of small facets or flats which subdivide the reflector into annular zones.
  • One example of rear reflector 12, shown in Figures 4 and 5, has about eleven annular zones 20 defined by the facets 21, each zone 20 having about thirty six facets 21 extending around the reflector to define a regular polygon having thirty six sides. In such a case the reflector 12 is said to be regularly facetted.
  • the zones 20 are of approximately equal width w measured along a generator 22 of the reflector 12, and therefore the width of said zones measured by projection thereof on to the axis 0, increases from the centre of the reflector outwardly to the zone of greatest diameter.
  • Figure 5 is also marked to show the respective angles made by the facets 21 of successive zones 20 with the intersecting zonal planes 23 normal to the axis O.
  • the facets 21 are of increasing width x around successive zones 20 with increasing diameter of the reflector 12. It may sometimes be preferable to vary the widths x of the facets 21 within each of some or all of the zones 20 depending on whether said facets are illuminated by the edge of the grid filament 11 or by the face thereof. In such a case the reflector 12 is said to be irregularly facetted.
  • FIG. 2 can employ a partial frontal reflector in addition to the rear reflector, as shown in Figures 2 and 3.
  • frontal reflector 13 is defined by an annular portion of a regular spherical or hyperbolic section, facing rearwardly to reflect light from the filament 11 on to the rear reflector 12, from which the light, together with that directly incident on the rear reflector 12 from the filament 11, is reflected forwardly through the axial zone defined by the inner diameter of the frontal reflector 13.
  • the modification shown in Figure 3 employs a facetted frontal reflector 14.
  • the frontal reflector 14 is employed to reflect light from the filament 11 in the forward direction.
  • a rear reflector 12 of regular spherical form may be used instead of a facetted rear reflector.
  • the grid filament 11 is disposed axially, being contained in a plane also containing the axis O of the reflector or reflectors (12, 13, 14).
  • the location of the filament 11 along the axis 0 varies with the reflector arrangement employed.
  • the filament 11 is situated deeper into the cup-shaped form of the rear reflector 12 when a frontal reflector 13 or 14 is omitted, and furthest outward from the bottom of the cup when a frontal reflector 13 is employed which reflects light rearwardly.
  • the filament is contained wholly within the cup, as shown in the drawings.
  • the light projection system is arranged so that each facet 21 reflects from the grid filament 11 a path of light which just fills a beam-confining aperture means 15 located between the light projection system and an optical objective 16, which aperture means 15 is constituted by a gate.
  • a concave reflector having the usual continuously curved reflecting surface, which reflector in accordance with conventional practice could be arranged to produce an image of the filament at the gate
  • a modified facetted reflector is employed with facets dimensioned each to produce a patch of light which just fills the gate.
  • a spotlight lantern in which the light projection system together with the aperture means 15 and the objective 16 are incorporated, will produce a well-defined beam with minimum light spill at the edges, with uniform distribution of light through the section of the beam, and also with minimum waste of light, thus ensuring high efficiency.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Claims (12)

1. Système de projection de lumière pour une lanterne de projecteur convergent, comprenant une lampe à filament (10) et des moyens réflecteurs concaves (12, 13 ou 14) par lesquels la lumière émise par la lampe est réfléchie à travers une fenêtre (15) jusqu'à un objectif optique (16) de manière à former le faisceau du projecteur la lampe (10) comportant un filament de grille allongé et plat (11) disposé axialement sur l'axe des moyens réflecteurs (12, 13 ou 14) caractérisé en ce que les moyens réflecteurs ont des facettes (21) qui produisent chacune une tache de lumière remplissant juste la fenêtre (15).
2. Système de projection de lumière selon la revendication 1, caractérisé en ce que les moyens réflecteurs comprennent un réflecteur arrière (12) ayant la forme d'une surface de révolution partielle définie par un grand nombre de facettes (21).
3. Système de projection de lumière selon la revendication 2, caractérisé en ce que le filament de grille (11) est complètement continue à l'intérieur de la coupe définie par le réflecteur arrière (12).
4. Système de projection de lumière selon l'une quelconque des revendications 2 et 3, caractérisé en ce que le réflecteur arrière (12) est à facettes régulières.
5. Système de projection de lumière selon l'une quelconque des revendications 2 et 3, caractérisé en ce que le réflecteur arrière (12) est à facettes irrégulières.
6. Système de projection de lumière selon l'une quelconque des revendications 1 à 5, caractérisé en ce que les moyens réflecteurs comprennent un réflecteur frontal partiel (13 ou 14).
7. Système de projection de lumière selon la revendication 1, caractérisé en ce que les moyens réflecteurs sont constitués par un réflecteur arrière (12) et par un réflecteur frontal partiel (13 ou 14) dont au moins l'un d'eux est à facettes.
8. Système de projection de lumière selon la revendication 7, caractérisé en ce que le réflecteur frontal partiel (14) est à facettes.
9. Système de projection de lumière selon la revendication 8, caractérisé en ce que le réflecteur arrière (12) est sphérique.
10. Système de projection de lumière selon la revendication 7, caractérisé en ce que le réflecteur arrière (12) est à facettes.
11. Système de projection de lumière selon la revendication 10, caractérisé en ce que le réflecteur frontal partiel (13) est sphérique.
12. Système de projection de lumière selon la revendication 10, caractérisé en ce que ie réflecteur frontal partiel (13) est hyperbolique.
EP19790300700 1978-04-26 1979-04-25 Optique pour projecteur Expired EP0005080B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1649578 1978-04-26
GB1649578 1978-04-26

Publications (2)

Publication Number Publication Date
EP0005080A1 EP0005080A1 (fr) 1979-10-31
EP0005080B1 true EP0005080B1 (fr) 1982-02-24

Family

ID=10078377

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19790300700 Expired EP0005080B1 (fr) 1978-04-26 1979-04-25 Optique pour projecteur

Country Status (3)

Country Link
EP (1) EP0005080B1 (fr)
DE (1) DE2962174D1 (fr)
GB (1) GB2019999B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19910192A1 (de) * 1999-03-09 2000-09-21 Schott Auer Gmbh Optisches Design für einen Reflektor zum Reflektieren von Lichtstrahlen

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0180665A1 (fr) * 1984-11-06 1986-05-14 Inlines Productions S.A. Dispositif d'éclairage avec cadrage
US4739456A (en) * 1986-12-12 1988-04-19 Little William D High intensity pattern/follow spot projector
JP2769259B2 (ja) * 1992-01-27 1998-06-25 株式会社小糸製作所 自動車用ヘッドランプ
US6206549B1 (en) 1999-05-27 2001-03-27 World Hint Limited Light reflector
GB2378499A (en) * 2001-08-10 2003-02-12 Central Research Lab Ltd A lamp for a projection system
DE102005029669A1 (de) 2005-06-22 2007-01-11 Arnold & Richter Cine Technik Gmbh & Co. Betriebs Kg Scheinwerfer
DE102005045685B4 (de) * 2005-09-24 2010-09-23 Automotive Lighting Reutlingen Gmbh Strahlungseinrichtung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1408875A (en) * 1922-03-07 Beflectoe
GB255589A (en) * 1925-05-26 1926-07-29 Thomas Davis Improvements in or relating to reflectors
FR751001A (fr) * 1932-05-21 1933-08-25 Dispositif optique pour appareils d'éclairage
US2597681A (en) * 1950-07-01 1952-05-20 Gen Electric Electric incandescent lamp
US3930149A (en) * 1974-05-28 1975-12-30 Sterndent Corp Variable intensity dental light
US4021659A (en) * 1975-10-30 1977-05-03 General Electric Company Projector lamp reflector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19910192A1 (de) * 1999-03-09 2000-09-21 Schott Auer Gmbh Optisches Design für einen Reflektor zum Reflektieren von Lichtstrahlen
DE19910192C2 (de) * 1999-03-09 2002-04-04 Schott Auer Gmbh Reflektor mit einem konkaven rotationssymmetrischen Grundkörper und einer Facetten aufweisenden Reflexionsfläche

Also Published As

Publication number Publication date
GB2019999B (en) 1982-03-24
DE2962174D1 (en) 1982-03-25
GB2019999A (en) 1979-11-07
EP0005080A1 (fr) 1979-10-31

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