GB620639A - Improvements in and relating to light controlling devices - Google Patents
Improvements in and relating to light controlling devicesInfo
- Publication number
- GB620639A GB620639A GB2339/47A GB233947A GB620639A GB 620639 A GB620639 A GB 620639A GB 2339/47 A GB2339/47 A GB 2339/47A GB 233947 A GB233947 A GB 233947A GB 620639 A GB620639 A GB 620639A
- Authority
- GB
- United Kingdom
- Prior art keywords
- face
- light
- holophane
- flutes
- intersection
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
620,639. Light refractors. HOLOPHANE, Ltd. (Soc. Anon. Holophane). Jan. 24, 1947, No. 2339. [Class 75(ii)] A light controlling device comprises one or more flat or slightly bulged transparent or translucent members each of which is provided on one face with a series of annular refracting prisms 1 centred at the intersection with the member of a normal dropped from the light source and on the other face with diffusing elements 2 disposed in straight lines. The refracting prisms 1 are on the face turned towards the light source and the diffusing elements 2 are formed by the intersection of two series of flutes of circular arcuate crosssection or by spherical calottes moulded on to the diffusing face and arranged in parallel lines. The two sets of flutes may be different. A central aperture in the device for inserting an electric bulb may be closed by a translucent plate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2339/47A GB620639A (en) | 1947-01-24 | 1947-01-24 | Improvements in and relating to light controlling devices |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2339/47A GB620639A (en) | 1947-01-24 | 1947-01-24 | Improvements in and relating to light controlling devices |
Publications (1)
Publication Number | Publication Date |
---|---|
GB620639A true GB620639A (en) | 1949-03-28 |
Family
ID=9737803
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2339/47A Expired GB620639A (en) | 1947-01-24 | 1947-01-24 | Improvements in and relating to light controlling devices |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB620639A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1009573B (en) * | 1952-06-25 | 1957-06-06 | Peill & Putzler Glashuetenwerk | For glare-free shielding of a light source, certain curved bodies made of transparent material |
US3119894A (en) * | 1962-04-02 | 1964-01-28 | Elastic Stop Nut Corp | Warning lens |
DE1233792B (en) * | 1961-08-08 | 1967-02-09 | Elastic Stop Nut Corp | Light distribution disc |
US3735124A (en) * | 1971-08-05 | 1973-05-22 | Emerson Electric Co | Prismatic lenses for lighting fixtures |
US11036036B2 (en) | 2015-10-26 | 2021-06-15 | Ledil Oy | Optical device for modifying light distribution |
-
1947
- 1947-01-24 GB GB2339/47A patent/GB620639A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1009573B (en) * | 1952-06-25 | 1957-06-06 | Peill & Putzler Glashuetenwerk | For glare-free shielding of a light source, certain curved bodies made of transparent material |
DE1233792B (en) * | 1961-08-08 | 1967-02-09 | Elastic Stop Nut Corp | Light distribution disc |
US3119894A (en) * | 1962-04-02 | 1964-01-28 | Elastic Stop Nut Corp | Warning lens |
US3735124A (en) * | 1971-08-05 | 1973-05-22 | Emerson Electric Co | Prismatic lenses for lighting fixtures |
US11036036B2 (en) | 2015-10-26 | 2021-06-15 | Ledil Oy | Optical device for modifying light distribution |
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