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GB276220A - Improvements in reflector-refractor light fittings - Google Patents

Improvements in reflector-refractor light fittings

Info

Publication number
GB276220A
GB276220A GB740/27A GB74027A GB276220A GB 276220 A GB276220 A GB 276220A GB 740/27 A GB740/27 A GB 740/27A GB 74027 A GB74027 A GB 74027A GB 276220 A GB276220 A GB 276220A
Authority
GB
United Kingdom
Prior art keywords
reflector
lens
axis
projector
centre
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
GB740/27A
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.)
Holophane SAS
Original Assignee
Holophane SAS
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 Holophane SAS filed Critical Holophane SAS
Priority to GB740/27A priority Critical patent/GB276220A/en
Publication of GB276220A publication Critical patent/GB276220A/en
Expired legal-status Critical Current

Links

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
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/162—Incandescent light sources, e.g. filament or halogen lamps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/43—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/02—Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters

Landscapes

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

Abstract

276,220. Stephens, A. J., (Soc. Anon Franþaise Holophane). Jan. 10, 1927. Vehicle lamps; shop windows, lamps for lighting; lantern door fittings.-A light-projector of small depth and capable of producing a parallel or diverging beam suitable for use as a vehicle lamp or for lighting shop-windows, comprises a hyperbolic reflector so arranged with respect to a thin prismatic lens which is convex in form and of great focal length, as to leave just enough space for an electric lamp bulb the centre of the filament of which coincides with the focus of the reflector. In the form shown in Fig. 1, a hyperbolic reflector 2 of polished metal or silvered glass has its axis O-O<1> downwardly inclined with respect to the axis X-X of the projector, and a prismatic lens 3 is carried by a frame 4 pivoted at 5 and held in position by a locking device 6. The lens 3 has a smooth inner face 7 which is circular, its centre of curvature coinciding with the virtual focus O<1> of the reflector, whilst the outer face 8 comprises a smooth central portion A surrounded by prisms adapted to concentrate the reflecter rays into a parallel beam D parallel with the axis O-O<1>. An opaque or reflecting band 11 may be formed on the bulb L so as to intercept extreme direct rays such as OR. The projector may be circular, the reflector being hyperboloidal, the lens spherical with annular prisms, and the filament as far as possible along the common axis O-O<1>, or it may be elongated, the reflector being cylindrical, the lens cylindrical with rectilineal prisms, and the filament as far as possible along the focal line passing through the point 0. In the form shown in Fig. 2, a hyperboloidal reflector M has its axis coincident with the axis X-X of the projector, and its central portion C, C<1> is made spherical with its centre of curvature coincident with the focus O of the hyperboloid, whilst the central portion of the lens F is provided with internal and external annular prisms P, P<1>. The lens frame 4 carries the lamp holder D of the bulb L having a concentrated filament and provided on its surface with a silver or other reflecting spheri. cal band f, g, f<1>, g<1> with its centre of curvature coincident with the focus O.
GB740/27A 1927-01-10 1927-01-10 Improvements in reflector-refractor light fittings Expired GB276220A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB740/27A GB276220A (en) 1927-01-10 1927-01-10 Improvements in reflector-refractor light fittings

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB740/27A GB276220A (en) 1927-01-10 1927-01-10 Improvements in reflector-refractor light fittings

Publications (1)

Publication Number Publication Date
GB276220A true GB276220A (en) 1927-08-25

Family

ID=9709682

Family Applications (1)

Application Number Title Priority Date Filing Date
GB740/27A Expired GB276220A (en) 1927-01-10 1927-01-10 Improvements in reflector-refractor light fittings

Country Status (1)

Country Link
GB (1) GB276220A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0084923A1 (en) * 1982-01-13 1983-08-03 Britax PMG Limited Signal lamps
EP0198452A2 (en) * 1985-04-16 1986-10-22 ABB CEAG Licht- und Stromversorgungstechnik GmbH Light fixture

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0084923A1 (en) * 1982-01-13 1983-08-03 Britax PMG Limited Signal lamps
EP0198452A2 (en) * 1985-04-16 1986-10-22 ABB CEAG Licht- und Stromversorgungstechnik GmbH Light fixture
EP0198452A3 (en) * 1985-04-16 1988-09-07 ABB CEAG Licht- und Stromversorgungstechnik GmbH Light fixture

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