EP0271150B1 - Leuchtvorrichtung mit Reflektoren, die gegen hinderliche Lichtpunkte Schützen - Google Patents

Leuchtvorrichtung mit Reflektoren, die gegen hinderliche Lichtpunkte Schützen Download PDF

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Publication number
EP0271150B1
EP0271150B1 EP19870202372 EP87202372A EP0271150B1 EP 0271150 B1 EP0271150 B1 EP 0271150B1 EP 19870202372 EP19870202372 EP 19870202372 EP 87202372 A EP87202372 A EP 87202372A EP 0271150 B1 EP0271150 B1 EP 0271150B1
Authority
EP
European Patent Office
Prior art keywords
angle
luminaire
light
lamp
shielding
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
Application number
EP19870202372
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English (en)
French (fr)
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EP0271150A1 (de
Inventor
Fransiscus Taeymans
Frans Adams
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"ETAP"
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"ETAP"
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Application filed by "ETAP" filed Critical "ETAP"
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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 a luminaire with at least one tubular lamp and a longitudinal reflector extending along and above said tubular lamp and having such a concave shape that all the light tranversely emitted from the lamp leaves the luminaire directly or after reflexion, under an angle with a base plane larger than or equal to a shielding angle ⁇ for said luminaire, which shielding angle ⁇ is comprised between about 30 and 45°, said luminaire further comprising a row of small transverse mirrors situated beneath said lamp and comprising a lower part of substantially V-shaped cross-section with concavely shaped sides and an upper part with mutually substantially parallel sides which upper part has according to its longitudinal direction a substantially V-shaped upper edge, the lines of which V-shape are joined by means of a curved piece.
  • Such a luminaire is known from French patent Nr. 2,554,549.
  • the V-shaped upper edge of the transverse mirrors forms an angle with said base plane equal to said shielding angle.
  • the upper edge of the transverse mirrors is situated very closely to the lamp. No covers are provided on the upper side of the transverse mirrors.
  • the transverse mirrors can cause a light-output reduction of upto 20 %.
  • the upper sides of the transverse mirrors are provided with a cover for reducing the light-output reduction due to the presence of the transverse mirrors.
  • a cover for reducing the light-output reduction due to the presence of the transverse mirrors.
  • “usual angle of observation” we mean here the angle in which one predominantly looks in the normal practice of using his sight.
  • an angle of observation ranging from + 10° to the perpendicular of the desk top to angles lying on a horizontal plane (visual communications).
  • visual communications For such task lighting it is common or desirable to construct the optical system in such a way as to prevent radiating large quantities of light allowing bright light spots to be visible within a beam shielding angle of 30-45° to the horizontal angle of observation.
  • Similar inconvenient light spots often occur when use is made of reflectors incorporating transverse mirrors, which are already on the market. These disturbances are the result of reflexions on the flat, reflective strip of material one finds on these transverse mirrors.
  • the invention here described aims, through the use of an optical system based on the original transverse mirrors, at directing the light in such a way that :
  • the luminaire according to the invention is characterized in that said upper part comprises a light-reflecting cover forming said V-shaped upper edge, the lines of which V-shape form an angle ⁇ ' with said base plane which angle ⁇ ' is smaller than said shielding angle ⁇ and which angle ⁇ ' is at least so large that light reflected by said cover does not leave the luminaire under an angle smaller than said shielding angle ⁇ .
  • the lines of said V-shape defined by the upper edge of the transverse mirrors, form an angle of about 28° with said base plate.
  • This angle of 28° corresponds to an angle of 124° between the lines of the V-shaped upper edge. Since the shielding angle is usually comprised between 30 and 45°, it will be clear that different lamp-positions are possible, each corresponding to a different shielding angle comprised between the hereabove mentioned values.
  • Figure 1 is a cross-section of the luminaire, according to the invention.
  • Figure 2 is a longitudinal cross-section of a part of the same luminaire.
  • Figure 3 is, on a different scale, a side view of a transverse mirror according to the invention.
  • Figure 4 is, on a different scale, a side-view of the commonly used type of transverse mirror.
  • the luminaire in accordance with the invention specifications and as shown in the above-mentioned figures, consists essentially of a housing indicated as 1 in Figure 1.
  • a reflector 3 is mounted partially along each side and partially above the lamp 2. Seen in section, it is mainly concave. This reflector can consist of either a single piece or, as seen in Figure 1, three different parts.
  • both the transverse mirrors according to the invention display, at least in part, a v-shaped section.
  • the commonly-used transverse mirrors 5 are mostly v-shaped in section, and their straight upper parts are fitted with a cover 6 that is clipped either above or onto the v-shaped part of the transverse mirror.
  • these covers In order to avoid beaming the amount of light by means of these covers in the "wrong" direction, and thus causing the above-mentioned discomforting light effects, these covers have until now either been painted with a highly light-absorbent material, such as matt black enamel, or made out of matt black synthetic material. The result is a reduction in the total amount of light emanating from the luminaire.
  • the total amount of light beamed is kept at maximum levels, and an observer, who looks obliquely or askance towards the luminaire from an angle of less than 30-45° to the ceiling, no longer sees the discomforting light spots described above; in other words, if the observer is unable to see the lamp itself, he is equally unable to see any light spots.
  • the transverse mirrors 4 ( Figures 1, 2 and 3) consist of two rectangular parts 7, shown in longitudinal section, which both, when seen in cross-section, combine to form a v-shape. If the case may be, they can be made out of a single piece.
  • the rectangular concave parts 7 of the transverse mirrors 4 are joined at the top to strips 8 consisting of two nearly-flat, parallel parts. Seen in front view or in longutudinal section, these strips have a v-shaped appearance.
  • the lines of this v-shape cross one another, forming an angle ⁇ of at least 120°.
  • An essential element for the invention is the fact that the angle ⁇ (formed between the tangent a of the lamp 2, and the tangent b with the reflector underside) does not have to concide with the angle ⁇ (formed by the tangent c with the upperside of a transverse mirror 4, and the tangent b with the reflector underside).
  • the strips 8 run between the two lines of the v-shape along a curve which forms a tangential circular connection with the above-mentioned v-shaped strips.
  • the strips 8 rise upwards at their outermost parts, and above them is a cover 9 made out of light-reflecting material.
  • the shape of the cover 9 (the angles ⁇ and the rounded part beneath the lamp(s)) has been chosen in such a way that, combined with the uppermost longitudinal mirror and the lateral longitudinal mirrors 3, if one glances sideways from any angle which in relation to the horizontal plane is less than the angle ⁇ , hardly any highly-luminant spots or none at all would be noticeable.
  • the light striking the cover 9 is then reflected at an angle greater than the angle ⁇ .
  • the amount of light recuperated from the cover 9 in certain cases results in a more than 20% increase in the total light-output as comapred to certain other designs which make no use of this specially-designed, light-reflecting cover 9.
  • the special curve of this cover 9, combined with the curving of the longitudinal mirrors 3, means that it is not necessary that the sides 8 of the transverse mirrors and the attached light-reflecting cover 9 are placed so high that angle ⁇ coincides, as it were, with angle ⁇ .
  • the flat strips 8 and the concavely-bent parts 7 can either be constructed out of a single piece or consist of two separate parts.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Optical Elements Other Than Lenses (AREA)

Claims (3)

  1. Leuchtvorrichtung mit mindestens einer rohrförmigen Lampe (2) und einem sich entlang und über der rohrförmigen Lampe (2) erstreckenden longitudinalen Reflektor (3), der eine derartige konkave Gestalt aufweist, daß sämtliches in Querrichtung von der Lampe (2) emittierte Licht die Leuchtvorrichtung direkt oder nach Reflektion unter einem Winkel zur Grundebene (b) verläßt, der grösser oder gleich einem zwischen ungefähr 30° und 45° liegendem Abschirmwinkel (α) der Leuchtvorrichtung ist, und mit einer Reihe von kleinen Querspiegeln (4), die unter der Lampe (2) angeordnet sind und einen unteren Teil (7) im wesentlichen V-förmigen Querschnitts mit konkaven Seiten und einen oberen Teil (8) mit einander im wesentlichen parallelen Seiten umfassen, welcher obere Teil in seiner Längsrichtung eine im wesentlichen V-förmige obere Kante aufweist, wobei die Schenkel der V-Form durch ein gebogenes Formstück verbunden sind, dadurch gekennzeichnet, daß der obere Teil (8) eine die V-förmige obere Kante bildene lichtreflektierende Abdeckung (9) umfaßt, wobei die Schenkel der V-Form einen Winkel (ß') mit der Grundebene bilden, der kleiner als der Abschirmwinkel (α) und mindestens so groß ist, daS das von der Abdeckung (9) reflektierte Licht die Leuchtvorrichtung nicht unter einem Winkel verläßt, der kleiner als der Abschirmwinkel (α) ist.
  2. Leuchtvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Schenkel der V-Form einen Winkel von ungefähr 28° mit der Grundebene bilden.
  3. Leuchtvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der untere Teil, in Längsrichtung der Leuchtvorrichtung gesehen, im wesentlichen rechteckig ist.
EP19870202372 1986-12-08 1987-12-01 Leuchtvorrichtung mit Reflektoren, die gegen hinderliche Lichtpunkte Schützen Expired EP0271150B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE0/217498A BE905874A (nl) 1986-12-08 1986-12-08 Tegen storende lichtspotjes beschermend verlichtingstoestel met spiegelreflektoren.
BE217498 1986-12-08

Publications (2)

Publication Number Publication Date
EP0271150A1 EP0271150A1 (de) 1988-06-15
EP0271150B1 true EP0271150B1 (de) 1992-04-22

Family

ID=3844098

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870202372 Expired EP0271150B1 (de) 1986-12-08 1987-12-01 Leuchtvorrichtung mit Reflektoren, die gegen hinderliche Lichtpunkte Schützen

Country Status (3)

Country Link
EP (1) EP0271150B1 (de)
BE (1) BE905874A (de)
DE (1) DE3778507D1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2648543B1 (fr) * 1989-06-14 1991-09-06 Armines Luminaire pour source lumineuse cylindrique
NL9402049A (nl) * 1994-12-06 1996-07-01 Etap Nv Verlichtingsinrichting.
CN1083078C (zh) * 1995-02-14 2002-04-17 皇家菲利浦电子有限公司 光源
NL1007835C2 (nl) * 1997-12-18 1999-06-21 Veco Products B V Verlichtingsarmatuur.
NL1027815C2 (nl) 2004-12-17 2006-06-20 Lichtholland B V Lamel voor een reflector van een verlichtingsarmatuur met een buislamp.
NL2000210C2 (nl) * 2006-09-05 2008-03-06 Screensupport B V Inrichting voor het belichten van een oppervlak.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3215026A1 (de) * 1982-04-22 1984-03-15 Thorn Emi Beleuchtungsgesellschaft mbH, 5760 Arnsberg Leuchte
AT381577B (de) * 1983-04-08 1986-11-10 Bartenbach Christian Blendungsfreie leuchte fuer eine stabfoermige lichtquelle
FR2554549B1 (fr) 1983-11-03 1988-03-11 Sabir Dispositif anti-eblouissement pour luminaires a sources lineaires

Also Published As

Publication number Publication date
EP0271150A1 (de) 1988-06-15
DE3778507D1 (de) 1992-05-27
BE905874A (nl) 1987-04-01

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