GB718504A - Light controlling refractors and luminairs using the same - Google Patents

Light controlling refractors and luminairs using the same

Info

Publication number
GB718504A
GB718504A GB9789/51A GB978951A GB718504A GB 718504 A GB718504 A GB 718504A GB 9789/51 A GB9789/51 A GB 9789/51A GB 978951 A GB978951 A GB 978951A GB 718504 A GB718504 A GB 718504A
Authority
GB
United Kingdom
Prior art keywords
degrees
angles
refractor
longitudinal directions
transverse
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
GB9789/51A
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 Ltd
Original Assignee
Holophane 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 Holophane Ltd filed Critical Holophane Ltd
Priority to GB9789/51A priority Critical patent/GB718504A/en
Publication of GB718504A publication Critical patent/GB718504A/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
    • F21V5/00—Refractors for light sources
    • F21V5/02—Refractors for light sources of prismatic shape
    • 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
    • F21V3/00—Globes; Bowls; Cover glasses
    • 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)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

718,504. Lighting fittings. HOLOPHANE, Ltd. April 26, 1951, No. 9789/51. Class 75 (2). A luminair employing a horizontal rectilinear light source such as tubular fluorescent lamps L has a refractor closure plate 90 having a smooth upper surface and a lower surface 92 formed by longitudinally extending straight sided contiguous ribs 50 which cut off light transmission in transverse vertical planes above angles corresponding with the slope of their sides and which co-operate optically with the smooth upper surface to produce substantially the same cut-off angles in both transverse and longitudinal directions. As shown in Fig. 11 the refractor has a central portion in the form of a wide V (apex angle 172 degrees) and curved side portions. Figs. 12 and 13 show the light control of this refractor in transverse and longitudinal directions respectively. For symmetrical ribs making angles of 30 degrees to 39 degrees with the horizontal the effective cut-off of light in longitudinal directions is at angles of 60 degrees to 66 degrees.
GB9789/51A 1951-04-26 1951-04-26 Light controlling refractors and luminairs using the same Expired GB718504A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9789/51A GB718504A (en) 1951-04-26 1951-04-26 Light controlling refractors and luminairs using the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9789/51A GB718504A (en) 1951-04-26 1951-04-26 Light controlling refractors and luminairs using the same

Publications (1)

Publication Number Publication Date
GB718504A true GB718504A (en) 1954-11-17

Family

ID=9878797

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9789/51A Expired GB718504A (en) 1951-04-26 1951-04-26 Light controlling refractors and luminairs using the same

Country Status (1)

Country Link
GB (1) GB718504A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2668838A1 (en) * 1990-11-07 1992-05-07 Faure Pierre Device having a transparent enclosure fitted with an internal area invisible from outside the enclosure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2668838A1 (en) * 1990-11-07 1992-05-07 Faure Pierre Device having a transparent enclosure fitted with an internal area invisible from outside the enclosure

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