EP0469031A1 - Improvement in fixtures for luminous tubes. - Google Patents
Improvement in fixtures for luminous tubes.Info
- Publication number
- EP0469031A1 EP0469031A1 EP90906378A EP90906378A EP0469031A1 EP 0469031 A1 EP0469031 A1 EP 0469031A1 EP 90906378 A EP90906378 A EP 90906378A EP 90906378 A EP90906378 A EP 90906378A EP 0469031 A1 EP0469031 A1 EP 0469031A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fins
- luminous tube
- pair
- fin
- curvature
- 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.)
- Granted
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
- F21V11/02—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using parallel laminae or strips, e.g. of Venetian-blind type
Definitions
- the present invention relates to an improvement in fixtures for luminous tubes or bulbs, and more specifically an improved version of the transverse lamellas or fins in the light shielding grid of the fixture.
- ceiling-mounted illumination with luminous bulbs could be provided with an opportune and comfortable design or mode of operation by fitting the fixture with a light shielding grid which provides a downward directing of the light by shielding and reflections.
- a light shielding grid which provides a downward directing of the light by shielding and reflections.
- such grid devices will, in addition to side and end reflectors intended for reflecting light mainly downward, be equipped with simple crossbar-like transverse fins in the form of vertically upright plates just below the luminous bulb or bulbs, mounted in a suitable number between the side reflectors, and with number, height and interval distance adapted for maximum allowable light scatter angle, maximum desirable construction height of the fixture etc.
- European patent application no. 138.747 discloses an example of such V-shaped transverse fins.
- the fins shown in said European application are designed with a three-dimensional curvature in the reflecting surfaces in order to improve the shielding conditions regarding obliquely reflected light rays.
- FIG. 2 corresponds approxi ⁇ mately to the above mentioned cross-sectional shape.
- Fig. 3 shows a closed top part of the V-fin, for achieving a reflection back again of the light, which then entails a higher light yield from the fixture due to inter-reflections which pass the upward reflected light from the fins, down again.
- the structure shown in fig. 4 provides a good increase of the light yield, but this implies the disadvantage of increasing the fixture construction height with a height difference of H2-H.
- the purpose of the present invention is to provide a fixture with transverse lamellas or fins which results in a corresponding increase in the light yield as the last mentioned variant, however without increasing the construction height in comparison with the variants of fig. 2 and 3. Said purpose is fulfilled by providing a luminous bulb fixture of the kind precisely defined in the enclosed patent claims.
- fig. 1 showing a general design of a luminous bulb fixture of previously known type in a perspective view, obliquely from below
- fig. 2-4 showing cross sections of the alreday mentioned previously known shapes of transverse lamellas
- fig. 5 showing a corresponding cross section of a pair of fins or lamellas constituting part of the present invention
- fig. 6 showing in a schematical manner light ray conditions in connection with a fixture in accordance with the invention.
- Fig. 1 shows a ceiling mounted fixture with one single luminous tube 4.
- the fixture is equipped with side reflectors 1, end reflectors 2 and quite simple plate-shaped transverse fins 3 for shielding and downward directing of the light from the luminous tube or bulb.
- the height of each fin or lamella 3, as well as the distance between fins determine the maximum angle with the vertical direction for escaping light rays in the case of a direct reflection, however multiple reflections imply a much wider scatter angle and poorer control of the darkening conditions.
- reference numeral 5 refers to more advanced designs of fins or lamellas, where the result is a poorer light yield than in the first case, however in return, better control of the shielding angle is achieved, and consequently more correct and comfortable illumination conditions.
- the solution in fig. 4 gives the better light yield, but the problem in this case is the increased construction height, which is usually not desirable.
- fig. 5 is shown a lamella example in accordance with the present invention.
- the same external geometry as in the V- shapes in figs. 2, 3 and 4 has been retained, i.e. preferably a parabolic curvature type for the the outer surfaces 7.
- the previous "V'-lamella has now been spilt into two single fins 6 in a mirror symmetrical relation, in such a manner that light can pass also "inside” or "through” the pair of fins 6-6.
- surfaces 8 and 9 are of a reflecting type in the same manner as the outer surfaces 7.
- the upper and lower edges are shown respectively with reference numerals 10 and 11. 12 indicates an edge line (into the paper plane) separating the two inner surfaces 8 and 9.
- An imaginary symmetry plane in the center is indicated by reference numeral 13, and is positioned perpendicularly to the luminous tube or bulb.
- Reference numeral 14 indicates the axis of the luminous bulb.
- the inner surfaces 8 are either flat or shaped with a slightly convex curvature type.
- the lower inner surfaces 9 have the same curvature type as the outer surfaces 7, however in a re-scaled, i.e. reduced version, so that the radius of curvature varies in the same manner, but is scaled down with a fixed factor.
- the upper inner surface 8 follows to a larger or smaller extent the curve of the lamella outside 7, however deviates slowly in a downward direction, either by a somewhat different curvature, or by being a flat surface, so that the "inversly curved" lower inner surface 9 starts from an edge 12 and curves back to the lower end edge 11.
- the distance between the single fins 6 in a fin pair is adjusted in such a manner that the same maximum exit angle is achieved also for light passing through said pair, as for light passing either directly or via reflections between the pairs. This is achieved by a proper choice of dimensions, as will be dealt with in more detail below.
- Fig. 6 shows examples of oblique ray passage through a grid of transverse lamellas 6 in accordance with the present invention.
- the preferred solution ensures, with regard to the lower reflection surfaces 9, that the same maximum exit angle ⁇ is obtained, and at the same time the total light yield is increased substantially in relation to the previously known solutions.
- the distance A is adjusted in the preferred embodiment with similar surfaces 9 as the surfaces 7, in such a manner that the ratio A'/h, h being the height from the lower edge 11 to the edge 12, and A' being the horizontal distance between lower edge 11 and inside edge 12 for two respective lamellas in a pair, equals tan ⁇ .
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO891443 | 1989-04-07 | ||
NO891443A NO167944C (en) | 1989-04-07 | 1989-04-07 | DEVICE FOR LIGHT RANGE LIGHT |
PCT/NO1990/000061 WO1990012245A1 (en) | 1989-04-07 | 1990-04-06 | Improvement in fixtures for luminous tubes |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0469031A1 true EP0469031A1 (en) | 1992-02-05 |
EP0469031B1 EP0469031B1 (en) | 1994-09-21 |
Family
ID=19891912
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90906378A Expired - Lifetime EP0469031B1 (en) | 1989-04-07 | 1990-04-06 | Improvement in fixtures for luminous tubes |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0469031B1 (en) |
AT (1) | ATE112030T1 (en) |
AU (1) | AU5431290A (en) |
DE (1) | DE69012812T2 (en) |
FI (1) | FI914719A0 (en) |
NO (1) | NO167944C (en) |
WO (1) | WO1990012245A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4109492C2 (en) * | 1991-03-22 | 2000-06-08 | Parol Leuchtenkomponenten Gmbh | Luminaire louvre for louvre luminaires equipped with discharge lamps |
DE4243659A1 (en) * | 1992-12-23 | 1994-06-30 | Licentia Gmbh | Metal grid for a lamp |
NL9302169A (en) * | 1993-12-13 | 1995-07-03 | Simon Cornelis Van Putten | Transverse lamella for a light box |
NL9301557A (en) * | 1993-09-09 | 1995-04-03 | Simon Cornelis Van Putten | Transverse lamella for a light box |
EP0643259B1 (en) * | 1993-09-09 | 1999-12-08 | Veko Products B.V. | A cross lamella for a light box |
NL1005610C2 (en) * | 1997-03-24 | 1998-09-28 | Veco Products B V | Illuminated sign with a transverse blade. |
US7128443B2 (en) * | 2002-06-28 | 2006-10-31 | Koninklijke Philips Electronics, N.V. | Light-collimating system |
DE102004039676A1 (en) * | 2004-08-16 | 2006-02-23 | Zumtobel Staff Gmbh | grid array |
NL1027815C2 (en) * | 2004-12-17 | 2006-06-20 | Lichtholland B V | Lamella (52) is for a reflector (2) for a light fitting for a tube lamp and comprises two opposing main sides, an upper side and a lower side (8), all sides having a light-reflecting surface |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1984108U (en) * | 1968-01-13 | 1968-04-25 | Guenther Gubela | GRID FOR ARRANGEMENT IN FRONT OF LIGHTING SOURCES. |
DE3412162C1 (en) * | 1984-03-31 | 1985-08-29 | Trilux-Lenze Gmbh + Co Kg, 5760 Arnsberg | Elongated lamp |
US6109566A (en) * | 1999-02-25 | 2000-08-29 | United Technologies Corporation | Vibration-driven acoustic jet controlling boundary layer separation |
-
1989
- 1989-04-07 NO NO891443A patent/NO167944C/en unknown
-
1990
- 1990-04-06 DE DE69012812T patent/DE69012812T2/en not_active Expired - Fee Related
- 1990-04-06 WO PCT/NO1990/000061 patent/WO1990012245A1/en active IP Right Grant
- 1990-04-06 AU AU54312/90A patent/AU5431290A/en not_active Abandoned
- 1990-04-06 AT AT90906378T patent/ATE112030T1/en not_active IP Right Cessation
- 1990-04-06 EP EP90906378A patent/EP0469031B1/en not_active Expired - Lifetime
-
1991
- 1991-10-07 FI FI914719A patent/FI914719A0/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9012245A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE69012812D1 (en) | 1994-10-27 |
WO1990012245A1 (en) | 1990-10-18 |
ATE112030T1 (en) | 1994-10-15 |
AU5431290A (en) | 1990-11-05 |
NO167944C (en) | 1991-12-27 |
FI914719A0 (en) | 1991-10-07 |
DE69012812T2 (en) | 1995-02-16 |
EP0469031B1 (en) | 1994-09-21 |
NO891443L (en) | 1990-10-08 |
NO167944B (en) | 1991-09-16 |
NO891443D0 (en) | 1989-04-07 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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