GB878215A - Light refracting and transmitting plates and equipment using the same - Google Patents

Light refracting and transmitting plates and equipment using the same

Info

Publication number
GB878215A
GB878215A GB37680/56A GB3768056A GB878215A GB 878215 A GB878215 A GB 878215A GB 37680/56 A GB37680/56 A GB 37680/56A GB 3768056 A GB3768056 A GB 3768056A GB 878215 A GB878215 A GB 878215A
Authority
GB
United Kingdom
Prior art keywords
depressions
moulding
conical
contiguous
plate
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
GB37680/56A
Inventor
John Guyscliffe Holmes
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 GB37680/56A priority Critical patent/GB878215A/en
Publication of GB878215A publication Critical patent/GB878215A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

878,215. Light refracting plates. HOLOPHANE Ltd. Dec. 4, 1957 [Dec. 10, 1956], No. 37680/56. Drawings to Specification. Class 75(2). A light transmitting and refracting plate is provided on the exit surface with a light controlling configuration acting in all azimuths by providing on that surface separate contiguous or nearly contiguous recesses having their surfaces at a slope approximately equal 2 to - (90 degrees-C) where y is an odd integer y greater than 1 and C is the critical angle of the material. The depressions may be conical and arranged with their centres at the apices of equilateral triangles, the base circles being contiguous, overlapping or spaced apart to leave small flat areas in between. Other regular or irregular arrangements of the depressions may be used. Alternatively the depressions may be in the form of square based pyramids or triangular based pyramids. The conical depressions may be produced by moulding a plastic such as methyl methacrylate or by moulding transparent resin or glass using a die plate with conical projections. The pyramidal depressions are formed by moulding using a die plate machined by cutting intersecting sets of parallel V-section grooves, which may be spaced apart to leave narrow flats between zones of any of the sets. The sizes of the depressions may be varied in different parts of the plate. Specification 619,084 is referred to.
GB37680/56A 1956-12-10 1956-12-10 Light refracting and transmitting plates and equipment using the same Expired GB878215A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB37680/56A GB878215A (en) 1956-12-10 1956-12-10 Light refracting and transmitting plates and equipment using the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB37680/56A GB878215A (en) 1956-12-10 1956-12-10 Light refracting and transmitting plates and equipment using the same

Publications (1)

Publication Number Publication Date
GB878215A true GB878215A (en) 1961-09-27

Family

ID=10398215

Family Applications (1)

Application Number Title Priority Date Filing Date
GB37680/56A Expired GB878215A (en) 1956-12-10 1956-12-10 Light refracting and transmitting plates and equipment using the same

Country Status (1)

Country Link
GB (1) GB878215A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5308200A (en) * 1991-12-13 1994-05-03 Koito Manufacturing Co., Ltd. Method of producing a die forming lens fisheye steps
WO1996017205A1 (en) * 1994-11-30 1996-06-06 Honeywell Inc. Prismatic refracting optical array for liquid flat panel crystal display backlight
WO2005083317A1 (en) 2004-02-20 2005-09-09 Koninklijke Philips Electronics N.V. A translucent lighting panel, a luminaire, and a method of manufacturing a panel
FR2870007A1 (en) * 2004-05-10 2005-11-11 Saint Gobain TRANSPARENT SHEET TEXTURED WITH INCLINED PYRAMIDAL PATTERNS
WO2006114763A1 (en) 2005-04-26 2006-11-02 Koninklijke Philips Electronics N.V. A luminaire and a lighting panel for a luminaire
EP2532953A1 (en) 2011-06-10 2012-12-12 Siteco Beleuchtungstechnik GmbH Prism panel
EP2647904A1 (en) 2012-04-05 2013-10-09 Siteco Beleuchtungstechnik GmbH Prism plate with varying flank angles
EP2647905A2 (en) 2012-04-05 2013-10-09 Siteco Beleuchtungstechnik GmbH Prism plate with varying flank angles

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5308200A (en) * 1991-12-13 1994-05-03 Koito Manufacturing Co., Ltd. Method of producing a die forming lens fisheye steps
WO1996017205A1 (en) * 1994-11-30 1996-06-06 Honeywell Inc. Prismatic refracting optical array for liquid flat panel crystal display backlight
US5579134A (en) * 1994-11-30 1996-11-26 Honeywell Inc. Prismatic refracting optical array for liquid flat panel crystal display backlight
WO2005083317A1 (en) 2004-02-20 2005-09-09 Koninklijke Philips Electronics N.V. A translucent lighting panel, a luminaire, and a method of manufacturing a panel
FR2870007A1 (en) * 2004-05-10 2005-11-11 Saint Gobain TRANSPARENT SHEET TEXTURED WITH INCLINED PYRAMIDAL PATTERNS
WO2005111670A1 (en) * 2004-05-10 2005-11-24 Saint-Gobain Glass France Textured transparent film having pyramidal patterns that can be associated with photovoltaic cells
WO2006114763A1 (en) 2005-04-26 2006-11-02 Koninklijke Philips Electronics N.V. A luminaire and a lighting panel for a luminaire
US7631980B2 (en) 2005-04-26 2009-12-15 Koninklijke Philips Electronics, N.V. Luminaire and a lighting panel for a luminaire
EP2532953A1 (en) 2011-06-10 2012-12-12 Siteco Beleuchtungstechnik GmbH Prism panel
DE102011103981A1 (en) 2011-06-10 2012-12-13 Siteco Beleuchtungstechnik Gmbh prism plate
EP2647904A1 (en) 2012-04-05 2013-10-09 Siteco Beleuchtungstechnik GmbH Prism plate with varying flank angles
EP2647905A2 (en) 2012-04-05 2013-10-09 Siteco Beleuchtungstechnik GmbH Prism plate with varying flank angles
DE102012102986A1 (en) 2012-04-05 2013-10-10 Siteco Beleuchtungstechnik Gmbh Prism plate with varying flank angles
DE102012102987A1 (en) 2012-04-05 2013-10-10 Siteco Beleuchtungstechnik Gmbh Prism plate with varying flank angles

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