GB449626A - Improvements in or relating to illuminating devices - Google Patents
Improvements in or relating to illuminating devicesInfo
- Publication number
- GB449626A GB449626A GB102335A GB102335A GB449626A GB 449626 A GB449626 A GB 449626A GB 102335 A GB102335 A GB 102335A GB 102335 A GB102335 A GB 102335A GB 449626 A GB449626 A GB 449626A
- Authority
- GB
- United Kingdom
- Prior art keywords
- reflector
- deflector
- light
- mouth
- transparent
- 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
- F21V7/00—Reflectors for light sources
- F21V7/04—Optical design
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
449,626. Reflectors for direct or indirect lighting. DOWNER, G. V., 5, Lansdowne Place, Guilford Street, St. Pancras, London..Jan. 11, 1935, No. 1023. [Class 75 ii)] In a ceiling, wall, or pedestal lamp for indirect or direct lighting, a light source 1 is mounted in a paraboloidal or other substantially bell-shaped reflector 2 which directs a considerable part of the light in a more or less concentrated beam and extends well beyond the source, and a tapering deflector 3 is placed axially in the path of the beam with its base beyond the mouth of the reflector and its apex extending close to the light source so that it reflects most of the beam outwards. A separate reflector may be provided at the apex of the reflector 2 to form the concentrated beam, or, as shown, the central part of the reflector may be specular. The remainder of the surface of the reflector 2 may be polished or matt, and may become approximately cylindrical towards the mouth. The space between the deflector 3 and the reflector rim may be covered with transparent or translucent material, e.g. diffusing glass. The deflector 3 may be solid or hollow, opaque or semi-transparent, and may have holes or slots for the passage of light. When it is hollow, its base may be covered with lightdiffusing glass. It may be conical, frustoconical, or pyramidal, and may have straight, convex, or concave sides. Specification 404,695 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB102335A GB449626A (en) | 1935-01-11 | 1935-01-11 | Improvements in or relating to illuminating devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB102335A GB449626A (en) | 1935-01-11 | 1935-01-11 | Improvements in or relating to illuminating devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB449626A true GB449626A (en) | 1936-07-01 |
Family
ID=9714792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB102335A Expired GB449626A (en) | 1935-01-11 | 1935-01-11 | Improvements in or relating to illuminating devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB449626A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2229870A1 (en) * | 2002-12-18 | 2005-04-16 | Talleres Cem S.L. | Light for installation in public highway, has smaller truncated cone surface whose base faces superior reflector with obtuse-angled vertex, and larger truncated cone surface whose base faces inferior reflector with acute vertex |
-
1935
- 1935-01-11 GB GB102335A patent/GB449626A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2229870A1 (en) * | 2002-12-18 | 2005-04-16 | Talleres Cem S.L. | Light for installation in public highway, has smaller truncated cone surface whose base faces superior reflector with obtuse-angled vertex, and larger truncated cone surface whose base faces inferior reflector with acute vertex |
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