GB762769A - Improvements relating to refractors for street lighting lanterns - Google Patents
Improvements relating to refractors for street lighting lanternsInfo
- Publication number
- GB762769A GB762769A GB28631/53A GB2863153A GB762769A GB 762769 A GB762769 A GB 762769A GB 28631/53 A GB28631/53 A GB 28631/53A GB 2863153 A GB2863153 A GB 2863153A GB 762769 A GB762769 A GB 762769A
- Authority
- GB
- United Kingdom
- Prior art keywords
- prisms
- refractor
- light
- street lighting
- refractors
- 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
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)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
762,769. Street lighting refractors. METROPOLITAN - VICKERS ELECTRICAL CO., Ltd. Oct. 20, 1954 [Oct. 16, 1953], No. 28631/53. Classes 75(2) and 75(4) A street lighting refractor 'provided on a surface with a plurality of prisms has the prisms 6<SP>11</SP> over at least a portion of the total arc covered by the refractor, particularly those receiving upwardly directed light which are' required both to reflect and refract the light downwardly spaced at their bases to an extent such as to avoid interception by one prism of the path of light emanating, in use, from the source and passing through an adjacent prism. Relatively small prisms 7 are provided between the main prisms 6" to reflect back towards the interior of the lantern light, e.g. upwardly directed, which would otherwise pass through the refractor between the main prisms and in the case where the prisms are on the side of the refractor away from the light source, the prisms 7 may be double reflecting right-angled prisms. The refractor may in the form of a bowl or trough-shaped portion for a lantern body or of a skirt portion for an open type lantern body and may be of glass or " Perspex " (Registered Trade Mark) or particularly, moulded from " Diakon " (Registered Trade Mark). The refractor described forms the skirt of a globe and is provided at its upper end with an inturned flange for securing by screws to bosses on a cap or canopy, e.g. of aluminium.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB28631/53A GB762769A (en) | 1953-10-16 | 1953-10-16 | Improvements relating to refractors for street lighting lanterns |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB28631/53A GB762769A (en) | 1953-10-16 | 1953-10-16 | Improvements relating to refractors for street lighting lanterns |
Publications (1)
Publication Number | Publication Date |
---|---|
GB762769A true GB762769A (en) | 1956-12-05 |
Family
ID=10278649
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB28631/53A Expired GB762769A (en) | 1953-10-16 | 1953-10-16 | Improvements relating to refractors for street lighting lanterns |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB762769A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0178019A1 (en) * | 1984-10-09 | 1986-04-16 | Koninklijke Philips Electronics N.V. | Illumination unit |
WO1996027757A1 (en) * | 1995-03-03 | 1996-09-12 | Minnesota Mining And Manufacturing Company | Light directing film having variable height structured surface and light directing article constructed therefrom |
US5631994A (en) * | 1995-08-23 | 1997-05-20 | Minnesota Mining And Manufacturing Company | Structured surface light extraction overlay and illumination system |
US6456437B1 (en) | 1999-01-14 | 2002-09-24 | 3M Innovative Properties Company | Optical sheets suitable for spreading light |
-
1953
- 1953-10-16 GB GB28631/53A patent/GB762769A/en not_active Expired
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0178019A1 (en) * | 1984-10-09 | 1986-04-16 | Koninklijke Philips Electronics N.V. | Illumination unit |
WO1996027757A1 (en) * | 1995-03-03 | 1996-09-12 | Minnesota Mining And Manufacturing Company | Light directing film having variable height structured surface and light directing article constructed therefrom |
US5771328A (en) * | 1995-03-03 | 1998-06-23 | Minnesota Mining And Manufacturing Company | Light directing film having variable height structured surface and light directing article constructed therefrom |
AU694619B2 (en) * | 1995-03-03 | 1998-07-23 | Minnesota Mining And Manufacturing Company | Light directing film having variable height structured surface and light directing article constructed therefrom |
US5631994A (en) * | 1995-08-23 | 1997-05-20 | Minnesota Mining And Manufacturing Company | Structured surface light extraction overlay and illumination system |
US6456437B1 (en) | 1999-01-14 | 2002-09-24 | 3M Innovative Properties Company | Optical sheets suitable for spreading light |
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