GB561540A - Improvements in and relating to luminairs - Google Patents
Improvements in and relating to luminairsInfo
- Publication number
- GB561540A GB561540A GB2114/42A GB211442A GB561540A GB 561540 A GB561540 A GB 561540A GB 2114/42 A GB2114/42 A GB 2114/42A GB 211442 A GB211442 A GB 211442A GB 561540 A GB561540 A GB 561540A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lens
- prisms
- light source
- parallel beam
- increasing distances
- 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)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
561,540. Lamps for lighting. HOLOPHANE, Ltd. Feb. 17, 1942, No. 2114. Convention date, Nov. 27, 1940. [Class 75 (ii)] A lens for projecting concentrated light beams in controlled direction comprises upper and lower lens pieces 10, 11, the inner lens piece 10 nearer the light source LC being formed with prisms so shaped that the centres 23, 28, 30 from which the issuing light rays 25 at increasing distances from the centre of the lens appear to emanate are at increasing distances from the lens and the outer lens piece 11 being formed with prisms which concentrate the light rays 24 into a parallel beam. The light source may be displaced by as much as 30 degrees to points 15, 17, Fig. 1, or a point Lc, Fig. 2, while still giving a parallel beam. The prisms may be concentric or rectilinear and an elongated light source may be used.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US561540XA | 1940-11-27 | 1940-11-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB561540A true GB561540A (en) | 1944-05-24 |
Family
ID=22002525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2114/42A Expired GB561540A (en) | 1940-11-27 | 1942-02-17 | Improvements in and relating to luminairs |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB561540A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4118114A (en) * | 1974-08-21 | 1978-10-03 | Minnesota Mining And Manufacturing Company | Low-glare overhead projector |
| GB2145809A (en) * | 1983-08-29 | 1985-04-03 | Canadian Patents Dev | Lightning panel |
-
1942
- 1942-02-17 GB GB2114/42A patent/GB561540A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4118114A (en) * | 1974-08-21 | 1978-10-03 | Minnesota Mining And Manufacturing Company | Low-glare overhead projector |
| GB2145809A (en) * | 1983-08-29 | 1985-04-03 | Canadian Patents Dev | Lightning panel |
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