GB609272A - Improvements in or relating to lighting fittings - Google Patents

Improvements in or relating to lighting fittings

Info

Publication number
GB609272A
GB609272A GB7474/46A GB747446A GB609272A GB 609272 A GB609272 A GB 609272A GB 7474/46 A GB7474/46 A GB 7474/46A GB 747446 A GB747446 A GB 747446A GB 609272 A GB609272 A GB 609272A
Authority
GB
United Kingdom
Prior art keywords
opening
reflector
area
depressions
march
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
GB7474/46A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB609272A publication Critical patent/GB609272A/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
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/09—Optical design with a combination of different curvatures

Landscapes

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

Abstract

609,272. Electric lighting fittings. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. March 11, 1946, No. 7474. Convention date, March 14, 1945. [Classes 75(ii) and 75(iv)] A lighting fitting comprises a screen 13 adapted to transmit or reflect light rays from a source 2, and a reflector 1 formed with figurations 6 such as depressions, each figuration forming an image of the light source and having an area of at most 1/500 of the area of the reflector opening 5. In a plane parallel to the opening 5 and situated at distance a below it equal to twice the diameter of the opening, the average surface area of the light spots formed by the depressions is at least 1/10 of the area of the opening 5, and preferably 75 per cent of the light flux reflected by the reflector 1 falls within a circle in this plane having a radius b equal to two and a half times the diameter of the opening 5. Preferably the radius of a depression is greater in axial section than in horizontal section. The screen 13 may be translucent and diffusing or may be reflecting to direct rays partly through an upper opening 4 and partly onto the reflector 1. The reflector may consist of thin reflecting material applied to a support of moulded fibrous material. Specification 457,199 is referred to.
GB7474/46A 1945-03-14 1946-03-11 Improvements in or relating to lighting fittings Expired GB609272A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE609272X 1945-03-14

Publications (1)

Publication Number Publication Date
GB609272A true GB609272A (en) 1948-09-28

Family

ID=3875216

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7474/46A Expired GB609272A (en) 1945-03-14 1946-03-11 Improvements in or relating to lighting fittings

Country Status (1)

Country Link
GB (1) GB609272A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5014174A (en) * 1988-02-06 1991-05-07 Joung H. Won Reflection sheet for lighting or color-lighting

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5014174A (en) * 1988-02-06 1991-05-07 Joung H. Won Reflection sheet for lighting or color-lighting

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