GB995255A - Prismatic refractors and electric lighting fittings incorporating such refractors - Google Patents
Prismatic refractors and electric lighting fittings incorporating such refractorsInfo
- Publication number
- GB995255A GB995255A GB6543/62A GB654362A GB995255A GB 995255 A GB995255 A GB 995255A GB 6543/62 A GB6543/62 A GB 6543/62A GB 654362 A GB654362 A GB 654362A GB 995255 A GB995255 A GB 995255A
- Authority
- GB
- United Kingdom
- Prior art keywords
- light
- prisms
- focii
- lamps
- groups
- 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
- F21V5/04—Refractors for light sources of lens shape
- F21V5/046—Refractors for light sources of lens shape the lens having a rotationally symmetrical shape about an axis for transmitting light in a direction mainly perpendicular to this axis, e.g. ring or annular lens with light source disposed inside the ring
Abstract
995,255. Light refractors for lamps. GENERAL ELECTRIC CO. Ltd. Jan. 30, 1963 [Feb. 20, 1962], No. 6543/62. Heading F4R. [Also in Division G2] Lamps are constructed of which the housings comprise refractor plates with pressure on one side formed in groups of parallel rows of prisms, the prism surfaces being arranged so that a parallel beam of light falling on a particular group at a predetermined angle will be split up and directed to two focii which may be points or lines. In the lamps, light bulbs or images thereof are placed at the focii of the various groups so that light coming from the lamps is suitably directed. In the embodiment shown in Fig. 4, conical mirrors 13, 14 produce ring images of a light centre F 1 at F 2 , F 2 <SP>1</SP>. Two refractor plates are arranged so that the focii of two groups of prisms are F 1 , F 2 and F 1 , F 2 <SP>1</SP>, so that the light emerges as a parallel beam as shown. In another embodiment the mirrors are replaced by a plane mirror opposite the light bulb which produces an image of the filament F 1 at a point F 2 . In this embodiment the focal point F 2 <SP>1</SP> is not " used." In the embodiment shown in Fig. 6, a conical refractor 29 is used and plane mirror 27 and conical mirror 28 form circular and point images respectively of lamp 26 at F 3 , F 2 . The two groups of prisms have their focii at F 1 , F 2 . and F 1 , F 3 respectively. In another embodiment similar to Fig. 6, the positions of the mirror are exchanged and the images of the lamps are not at the focii of the prism groups but are so arranged that the light is directed downwards below the horizontal. In the embodiment shown in Fig. 8, a tubular lamp is used in conjunction with plane reflector 34, inverted V reflector 35 and elongated refractor plates 32, 33. More than one light bulb is used in another embodiment. The side of the refractor plate opposite the prisms may have flutes or prisms running perpendicular to the first-mentioned prisms. Specification 904,756 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB6543/62A GB995255A (en) | 1962-02-20 | 1962-02-20 | Prismatic refractors and electric lighting fittings incorporating such refractors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB6543/62A GB995255A (en) | 1962-02-20 | 1962-02-20 | Prismatic refractors and electric lighting fittings incorporating such refractors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB995255A true GB995255A (en) | 1965-06-16 |
Family
ID=9816421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB6543/62A Expired GB995255A (en) | 1962-02-20 | 1962-02-20 | Prismatic refractors and electric lighting fittings incorporating such refractors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB995255A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015101583A1 (en) * | 2014-01-03 | 2015-07-09 | Koninklijke Philips N.V. | Optical element, lighting device and luminaire |
-
1962
- 1962-02-20 GB GB6543/62A patent/GB995255A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015101583A1 (en) * | 2014-01-03 | 2015-07-09 | Koninklijke Philips N.V. | Optical element, lighting device and luminaire |
| US9869448B2 (en) | 2014-01-03 | 2018-01-16 | Philips Lighting Holding B.V. | Optical element, lighting device and luminaire |
| RU2672051C2 (en) * | 2014-01-03 | 2018-11-09 | Филипс Лайтинг Холдинг Б.В. | Optical element, lighting device and luminaire |
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