GB669180A - Improvements in or relating to lighting fixtures - Google Patents

Improvements in or relating to lighting fixtures

Info

Publication number
GB669180A
GB669180A GB1227/50A GB122750A GB669180A GB 669180 A GB669180 A GB 669180A GB 1227/50 A GB1227/50 A GB 1227/50A GB 122750 A GB122750 A GB 122750A GB 669180 A GB669180 A GB 669180A
Authority
GB
United Kingdom
Prior art keywords
light source
rays
focus
foci
parabola
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
GB1227/50A
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.)
Claude Paz et Visseaux SA
Original Assignee
Societe Anonyme pour les Applications de lElectricite et des Gaz Rares Etablissement Claude Paz et Silva
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 Societe Anonyme pour les Applications de lElectricite et des Gaz Rares Etablissement Claude Paz et Silva filed Critical Societe Anonyme pour les Applications de lElectricite et des Gaz Rares Etablissement Claude Paz et Silva
Publication of GB669180A publication Critical patent/GB669180A/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
    • F21V7/005—Reflectors for light sources with an elongated shape to cooperate with linear light sources
    • 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
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes

Abstract

669,180. Lighting fittings. SOC. ANON. POUR LES APPLICATIONS DE L'ELECTRICITE ET DES GAZ RARES ETABLISSEMENTS CLAUDE-PAZ ET SILVA. Jan. 17, 1950 [Feb. 11, 1949], No. 1227/50. Classes 75(ii) and 75(iv) In a lighting fitting having at least one reflector, for use in conjunction with at least one light source, the shape of the reflecting surface being generated geometrically by the displacement of a co-planar continuous line which includes at least one parabolic arc and at least one elliptical arc having a common focus which coincides substantially with a point on said light source or on one of said light sources, the concave sides of these curves facing the light source or sources, the distance between the foci of the elliptical arc is longer than the width of said light source or sources measured in a direction parallel to the major axis of the ellipse and said common focus is farther from the vertex of the parabola than the other focus of said ellipse. The light source may be a tubular fluorescent lamp 1, Fig. 1, the length of which is parallel to the generatrices of the curved reflecting surface having a section shown by the continuous co-planar line 2, 3, 4, 5. The latter comprises a first elliptical arc 2 to 3, a second elliptical arc 3 to 4, and a parabolic arc 4 to 5, the parabola having its apex at the point 4 and a horizontal axis I-I coinciding with the major axes of the ellipses. The end 2 of the first elliptical arc is located on the axis I-I; and the focus 6 of the parabola substantially coincides with the centre of the section of the light source 1 as well as with one of the foci of each of the ellipses, the other foci 7, 8 of the latter being located between the focus 6 and the apex 4 of the parabola. The distance between the foci 6, 7 is slightly greater than the width of the envelope of the source 1 measured along the axis I-I in order to minimize the amount of rays reflected by the portion 2 to 3 impinging on this envelope. Light rays such as 9 are reflected directly by the parabolic portion 4, 5 as horizontal rays 10, whilst rays 11, 15 emitted towards and reflected by the elliptical portions 2, 3 and 3, 4, respectively, are subsequently reflected by the parabolic portion 4, 5 as rays 13, 14. The light source 1 may be a tubular lamp of toroidal shape. Two reflectors of the cross-section shown in Fig. 1 may be associated with a single straight tubular lamp for providing light beams in opposite horizontal directions.
GB1227/50A 1949-02-11 1950-01-17 Improvements in or relating to lighting fixtures Expired GB669180A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1011455T 1949-02-11

Publications (1)

Publication Number Publication Date
GB669180A true GB669180A (en) 1952-03-26

Family

ID=9569950

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1227/50A Expired GB669180A (en) 1949-02-11 1950-01-17 Improvements in or relating to lighting fixtures

Country Status (4)

Country Link
CH (1) CH285931A (en)
DE (1) DE864684C (en)
FR (1) FR1011455A (en)
GB (1) GB669180A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2717954A (en) * 1950-08-16 1955-09-13 Gen Electric Elongated roadway luminaire
US2800576A (en) * 1955-06-09 1957-07-23 John C Epperson Street lighting fixture
US2806939A (en) * 1955-01-14 1957-09-17 Montebello Roger De Light-box
US3679893A (en) * 1970-09-03 1972-07-25 Sylvan R Schemitz And Associat Luminaire reflector comprising elliptical and parabolic segments
CN115016200A (en) * 2022-06-10 2022-09-06 杭州海康威视数字技术股份有限公司 Reflective light supplementing device and camera

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1168363B (en) * 1954-01-27 1964-04-23 Gustaf Rikard Hassel Luminaire for room and street lighting with one or more cylindrical light sources in a cylindrical mirror reflector
DE1175626B (en) * 1957-04-26 1964-08-13 Trilux Lenze Gmbh & Co Kg lamp
US4089047A (en) * 1976-04-26 1978-05-09 Willy Luderitz Trifocal mirror-reflector
FR2396922A1 (en) * 1977-07-08 1979-02-02 Lampes Sa OPTICAL DEVICE PROVIDING A DIRECTIVE LIGHT BEAM AND LIGHTING DEVICE INCLUDING SUCH A DEVICE
US4229779A (en) * 1978-05-19 1980-10-21 International Telephone And Telegraph Corporation Luminaire with arcuate reflector
US4665895A (en) * 1984-09-21 1987-05-19 Mcdonnell Douglas Corporation Ellipsoidal solar dish concentrator
DE29710881U1 (en) * 1997-06-21 1997-08-14 Baero Baehren & Rosenkranz Kg Wall washer
DE19945692A1 (en) * 1999-09-23 2001-03-29 Lighting Innovation Ct Ag Scha Lamp reflector, lamp and canopy for lamp for providing indirect lighting with reflector directing light away from lamp
DE102014105675A1 (en) * 2014-04-23 2015-11-12 Krones Aktiengesellschaft Apparatus and method for heating plastic preforms

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2717954A (en) * 1950-08-16 1955-09-13 Gen Electric Elongated roadway luminaire
US2806939A (en) * 1955-01-14 1957-09-17 Montebello Roger De Light-box
US2800576A (en) * 1955-06-09 1957-07-23 John C Epperson Street lighting fixture
US3679893A (en) * 1970-09-03 1972-07-25 Sylvan R Schemitz And Associat Luminaire reflector comprising elliptical and parabolic segments
CN115016200A (en) * 2022-06-10 2022-09-06 杭州海康威视数字技术股份有限公司 Reflective light supplementing device and camera

Also Published As

Publication number Publication date
CH285931A (en) 1952-09-30
FR1011455A (en) 1952-06-23
DE864684C (en) 1953-01-26

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