GB448645A - Improvements in reflectors for street lighting or the like - Google Patents

Improvements in reflectors for street lighting or the like

Info

Publication number
GB448645A
GB448645A GB3839/35A GB383935A GB448645A GB 448645 A GB448645 A GB 448645A GB 3839/35 A GB3839/35 A GB 3839/35A GB 383935 A GB383935 A GB 383935A GB 448645 A GB448645 A GB 448645A
Authority
GB
United Kingdom
Prior art keywords
reflector
paraboloids
plane
axis
street
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
GB3839/35A
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 GB448645A publication Critical patent/GB448645A/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
    • 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

448,645. Reflectors for street &c. lamps. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN, Emmasingel, Eindhoven, Holland. Feb. 6, 1935, No. 3839. Convention date, April 18, 1934. [Class 75 (ii)] Part of a street-lighting or like reflector, which is symmetrical with respect to two planes intersecting in the reflector axis M F, is formed by two partial paraboloids A B, C D extending on either side of a plane KL normal to the axis MF, which plane contains the lower end of the elongated light source 2 and the foci of the paraboloids, so that the light rays reflected by these paraboloids are directed through the reflector opening, and part of the reflector is formed by a parabolic body of revolution having an axis of rotation which lies in the plane KL. The common focus F of the paraboloids lies at the end of the light source, and BF, DF are the axes of the paraboloids. The body of revolution is formed by the rotation of a parabola, with its focus at F and lying in a plane perpendicular to that of Fig. 2, about its parameter. Triangular parts CNA at the sides of the reflector may be cut away. The reflector may be of silvered glass or of metal coated with silver or white enamel.
GB3839/35A 1934-04-18 1935-02-06 Improvements in reflectors for street lighting or the like Expired GB448645A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL448645X 1934-04-18

Publications (1)

Publication Number Publication Date
GB448645A true GB448645A (en) 1936-06-12

Family

ID=19786293

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3839/35A Expired GB448645A (en) 1934-04-18 1935-02-06 Improvements in reflectors for street lighting or the like

Country Status (1)

Country Link
GB (1) GB448645A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2486558A (en) * 1947-08-07 1949-11-01 Holophane Co Inc Street lighting luminaire and refractor therefor
US2600514A (en) * 1948-02-02 1952-06-17 Percival H Mitchell Elliptical type street lighting reflector incorporating parabolic reflecting areas
US2739226A (en) * 1949-06-03 1956-03-20 Gen Electric Luminaire
US2878369A (en) * 1954-04-29 1959-03-17 Philips Corp Lighting fixture
US2921181A (en) * 1957-10-24 1960-01-12 William B Elmer Street lighting luminaire

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2486558A (en) * 1947-08-07 1949-11-01 Holophane Co Inc Street lighting luminaire and refractor therefor
US2600514A (en) * 1948-02-02 1952-06-17 Percival H Mitchell Elliptical type street lighting reflector incorporating parabolic reflecting areas
US2739226A (en) * 1949-06-03 1956-03-20 Gen Electric Luminaire
US2878369A (en) * 1954-04-29 1959-03-17 Philips Corp Lighting fixture
US2921181A (en) * 1957-10-24 1960-01-12 William B Elmer Street lighting luminaire

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