GB781391A - Improvements in or relating to lighting fittings comprising a tubular light source - Google Patents

Improvements in or relating to lighting fittings comprising a tubular light source

Info

Publication number
GB781391A
GB781391A GB12014/55A GB1201455A GB781391A GB 781391 A GB781391 A GB 781391A GB 12014/55 A GB12014/55 A GB 12014/55A GB 1201455 A GB1201455 A GB 1201455A GB 781391 A GB781391 A GB 781391A
Authority
GB
United Kingdom
Prior art keywords
source
mirrors
angle
point
lighting fittings
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
GB12014/55A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB781391A publication Critical patent/GB781391A/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

Landscapes

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

Abstract

781,391. Fluorescent tube lighting fittings. PHILIPS ELETRICAL INDUSTRIES. Ltd. April 26, 1955 [April 29, 1954], No. 12014/55. Classes 75(2) and 75(4) A lighting fitting for an elongated light source such as a fluorescent tube providing a uniform illumination broadside in a horizontal plane, e.g. on a road surface comprises at its top a flat mirror 2 on each side of the source 1 inclined to each other at an angle of from 180-200 degrees on the source side and tangential to the upper surface of the source and joined each at the edge G, G<SP>1</SP> remote from the source to a part-cylindrical mirror 3, 4 of parabolic transverse section and disposed with such sections at right angles to the axis of the source and with the axes GH, G<SP>1</SP>H<SP>1</SP> of the sections passing through the intersections G, G<SP>1</SP> and through the part F of the source 1 most remote from the mirror 2 while the parabolic arcs 3, 4 subtend at point F an angle of not more than 30 degrees, this angle being bisected by the line FM at right angles to the line of symmetry JK. The foci of the mirrors 3, 4 lie at the point of intersection of their axes with the axis of symmetry JK of the lighting fittings i.e. at point F. Fig. 4 (not shown) illustrates an embodiment in which the mirrors 3 and 4 are also curved in the transverse horizontal plane, and Fig. 5 (not shown) the case with inclined mirrors 2 and with two horizontal light tubes one above the other.
GB12014/55A 1954-04-29 1955-04-26 Improvements in or relating to lighting fittings comprising a tubular light source Expired GB781391A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL781391X 1954-04-29

Publications (1)

Publication Number Publication Date
GB781391A true GB781391A (en) 1957-08-21

Family

ID=19832157

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12014/55A Expired GB781391A (en) 1954-04-29 1955-04-26 Improvements in or relating to lighting fittings comprising a tubular light source

Country Status (1)

Country Link
GB (1) GB781391A (en)

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