GB1390344A - Reflecting grid for fluorescent lamps - Google Patents
Reflecting grid for fluorescent lampsInfo
- Publication number
- GB1390344A GB1390344A GB34273A GB34273A GB1390344A GB 1390344 A GB1390344 A GB 1390344A GB 34273 A GB34273 A GB 34273A GB 34273 A GB34273 A GB 34273A GB 1390344 A GB1390344 A GB 1390344A
- Authority
- GB
- United Kingdom
- Prior art keywords
- elements
- axis
- grid
- reflective
- light
- 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
- F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
- F21V11/06—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using crossed laminae or strips, e.g. grid-shaped louvers; using lattices or honeycombs
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24744—Longitudinal or transverse tubular cavity or cell
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
1390344 Lighting fittings P WILLUNSEN 3 Jan 1973 [4 Jan 1972] 342/73 Heading F4R A reflective grid, Figs. 1 and 2, for use with a fluorescent lighting fitting comprises a system of open-ended tubular elements 2 each of which has an external convex reflective surface 3 and an internal concave reflective surface 4, the ends of the tubular elements nearer to the light source 5 being of smaller cross-sectional area than the ends farther from the source and the grid being so constructed that light passes through the spaces 8 between the elements as well as through the elements themselves. The tubular elements may be surfaces of revolution formed by rotating a parabolic arc B 2 D 2 , Fig. 5, about an axis C, the arc being derived from a parabola P having an axis A and focus B 1 by drawing a line through the focus B 1 at an angle V to the axis A to cut the parabola at B 2 , forming the axis C by perpendicularly bisecting the line B 1 B 2 , and drawing a line through the focus B 1 at an angle V to the axis C to cut the parabola at D 2 . The surface has the property that light entering the smaller end at any angle cannot leave the larger end at an angle greater than V to the axis C, so that the tubular elements produce a controlled downwardly-directed luminous flux from the light which passes through the elements. The elements are mounted in a reflective structure composed of mutually perpendicular walls 6, 7, each element being disposed either in a space formed by removing an X-shaped portion from the intersection of two walls, as shown in Fig. 2, or within the alternate square openings formed by adjacent pairs of intersecting walls, as in a chessboard pattern. The light which passes through the spaces 8 between the elements is reflected by the outer surfaces 3 of the elements and by the walls 6, 7, and issues as a diffuse widely-spread luminous flux, this flux being coloured if desired by covering the spaces 8 by a transparent coloured filter or by colouring all the reflective surfaces except the internal surfaces of the elements. The grid is preferably made of plastics material having an aluminium coating which has been treated to make it resistant to corrosion, but may alternatively be made of a reflective material coated with transparent plastics. In an alternative embodiment, (Figs. 3 and 4, not shown) the grid is composed of tubular elements (2<SP>1</SP>) having a square cross-section, the elements being joined together at the corners of their wider ends to form the alternate squares of a chessboard pattern. Each element has four sides, preferably in the form of portions of a parabolic cylindrical surface. In modifications of this embodiment the cross-sections of the elements have the form of other polygons with straight or curved sides. The grid produces a polar curve of light distribution (Fig. 11, not shown) of substantially pear-shaped form. The curvature of the external surface 3 of each tubular element preferably conforms to the curature of the internal surface 4, and each surface is preferably generated by a portion of a curve of the form the parabolic elements described above being obtained when n = 2. Alternatively, the generating curve may be part of an ellipse or hyperbola.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK2772A DK130937C (en) | 1972-01-04 | 1972-01-04 | LIGHTING FOR LIGHTING LIGHT |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1390344A true GB1390344A (en) | 1975-04-09 |
Family
ID=8088914
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB34273A Expired GB1390344A (en) | 1972-01-04 | 1973-01-03 | Reflecting grid for fluorescent lamps |
Country Status (6)
Country | Link |
---|---|
US (1) | US3808421A (en) |
DE (1) | DE2263803B2 (en) |
DK (1) | DK130937C (en) |
GB (1) | GB1390344A (en) |
MY (1) | MY8400236A (en) |
SE (2) | SE400359C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3831205A1 (en) * | 1988-09-14 | 1990-03-22 | Licentia Gmbh | METHOD FOR PRODUCING A LIGHT GRID |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DK130937C (en) * | 1972-01-04 | 1982-07-05 | Decorona Aps | LIGHTING FOR LIGHTING LIGHT |
US5147761A (en) * | 1990-06-11 | 1992-09-15 | W. R. Grace & Co.-Conn. | Method for preparing relief image printing plates |
CA2177634C (en) * | 1996-01-17 | 2000-02-22 | George Mcilwraith | Reflective materials for manufacture of reflective lighting elements including parabolic louvers and the like |
EP1154200B1 (en) * | 2000-05-10 | 2007-10-24 | Regent Beleuchtungskörper AG | Light distributor for a lighting assembly, lighting assembly and use of a lighting assembly |
DE102011117156A1 (en) * | 2011-10-28 | 2013-05-02 | Tobias Grau | lamp |
CN104141905B (en) * | 2013-05-07 | 2016-09-07 | 苏州欧普照明有限公司 | A kind of light fixture |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3124310A (en) * | 1964-03-10 | lipscomb | ||
US2839671A (en) * | 1956-01-13 | 1958-06-17 | Harry H Shearin | Light-diffusing unit |
US2937265A (en) * | 1958-02-10 | 1960-05-17 | Blitzer Bud | Cellular lighting element and means for supporting the same |
GB993402A (en) * | 1960-08-25 | 1965-05-26 | Reginald Henry Bone | Improvements in or relating to light shielding means and the like |
US3246138A (en) * | 1963-06-11 | 1966-04-12 | Lightolier Inc | Low brightness louver for lighting fixture |
DE1597908A1 (en) * | 1967-01-14 | 1970-08-27 | Acker Norbert Karl | Room lighting |
US3600570A (en) * | 1967-12-11 | 1971-08-17 | Mitsubishi Rayon Co | Low glare louver |
DE1984108U (en) * | 1968-01-13 | 1968-04-25 | Guenther Gubela | GRID FOR ARRANGEMENT IN FRONT OF LIGHTING SOURCES. |
FR1570726A (en) * | 1968-04-30 | 1969-06-13 | ||
DE1935378A1 (en) * | 1969-07-11 | 1971-01-21 | Ernst Duellmann Kg | Light grid for lights with rod-shaped light sources |
US3708381A (en) * | 1970-07-06 | 1973-01-02 | R Schwartz | Interconnecting means for modular closed louver panel system |
DK130937C (en) * | 1972-01-04 | 1982-07-05 | Decorona Aps | LIGHTING FOR LIGHTING LIGHT |
-
1972
- 1972-01-04 DK DK2772A patent/DK130937C/en not_active IP Right Cessation
- 1972-12-27 SE SE7216965A patent/SE400359C/en unknown
- 1972-12-28 DE DE19722263803 patent/DE2263803B2/en not_active Ceased
-
1973
- 1973-01-02 US US00320588A patent/US3808421A/en not_active Expired - Lifetime
- 1973-01-03 GB GB34273A patent/GB1390344A/en not_active Expired
-
1977
- 1977-07-14 SE SE7708167A patent/SE7708167L/en unknown
-
1984
- 1984-12-30 MY MY236/84A patent/MY8400236A/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3831205A1 (en) * | 1988-09-14 | 1990-03-22 | Licentia Gmbh | METHOD FOR PRODUCING A LIGHT GRID |
Also Published As
Publication number | Publication date |
---|---|
US3808421A (en) | 1974-04-30 |
SE400359C (en) | 1979-10-08 |
MY8400236A (en) | 1984-12-31 |
DE2263803A1 (en) | 1973-07-12 |
DK130937C (en) | 1982-07-05 |
SE400359B (en) | 1978-03-20 |
DE2263803B2 (en) | 1977-07-21 |
SE7708167L (en) | 1977-07-14 |
DK130937B (en) | 1975-05-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |