EP0198811B1 - Einrichtung für asymmetrische Beleuchtung - Google Patents

Einrichtung für asymmetrische Beleuchtung Download PDF

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Publication number
EP0198811B1
EP0198811B1 EP86850137A EP86850137A EP0198811B1 EP 0198811 B1 EP0198811 B1 EP 0198811B1 EP 86850137 A EP86850137 A EP 86850137A EP 86850137 A EP86850137 A EP 86850137A EP 0198811 B1 EP0198811 B1 EP 0198811B1
Authority
EP
European Patent Office
Prior art keywords
reflector
light source
arrangement
lamp
rear portion
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 - Lifetime
Application number
EP86850137A
Other languages
English (en)
French (fr)
Other versions
EP0198811A3 (en
EP0198811A2 (de
Inventor
Jens Chr. Krogsrud
Kai O. Sorensen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jac Jacobsen Industrier AS
Original Assignee
Jac Jacobsen Industrier AS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Jac Jacobsen Industrier AS filed Critical Jac Jacobsen Industrier AS
Publication of EP0198811A2 publication Critical patent/EP0198811A2/de
Publication of EP0198811A3 publication Critical patent/EP0198811A3/en
Application granted granted Critical
Publication of EP0198811B1 publication Critical patent/EP0198811B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/05—Optical design plane
    • 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
    • F21V7/07—Optical design with hyperbolic curvature
    • 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
    • F21V7/09—Optical design with a combination of different curvatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/10—Outdoor lighting

Definitions

  • the invention relates to an asymmetric lighting arrangement of the kind stated in the preamble of claim 1.
  • the illuminating intensity on the working area should be high and uniform. Outside the working area illumination intensity should gradually decrease in all directions, including areas toward, below, and behind said lamp. It is also desirable that the light opening is at a rather small distance above the table, i.e. approximately 40 cm above the level of the working area, in order to avoid glare and ensuring a good distance between the front edge of the reflector and the center of the working area, which distance should be 40 cm.
  • the size of the reflector should be as small as possible to avoid a dominating appearance and a structure that might be restrictive to work.
  • a source of light especially considered for use is a so called PL-type fluorescent lamp.
  • One object of the present invention is to avoid the above mentioned disadvantages.
  • this object is achieved by means of a reflector having the features stated in the characterizing clause of claim 1.
  • the nominal luminous flux of said lamps is 2000 lm. This quantity of light is, indeed, too large if it is permitted to illuminate the area close to the lamp without restriction.
  • the rear portion of the reflector encloses and is provided close to, but spaced apart from, the rear portion of the light source, thereby reflecting part of the light flow back onto said light source portion, so that the luminance of the light source is increased which will result in an increased lighting intensity on the most remote portion of the working area.
  • the portion of the reflector surrounding the light source may be quite low, 4-6 cm, with a length normal to the light source of 20-30 cm.
  • side reflectors may also be provided. Such side reflectors may be curved or inclined so as to increase the light opening area still more.
  • the forward reflector portion does not have the form of a continuous hyperbola or cylindrical surface since it is, as previously known, almost impossible to manufacture reflectors with such accuracy economically.
  • This reflector from several parallel faces which together formed an approximate hyperbola.
  • the forward portion of the reflector is composed of triangular facets. As a consequence of this composition there will be diagonal overlaps in the light pattern removing striations.
  • the size of the reflector is substantially shortened and, at the same time, a fairly uniform illumination of the working area is achieved as in case of a corresponding larger reflector without any lattice.
  • Figure 1 is a diagrammatical elevational view in perspective of a lamp with a reflector 1 having a forward portion 6 with a hyperbolic profile with focus 7 at the lower edge of the light source 3.
  • the light source is a so called PL-type fluorescent lamp.
  • the curvature of the substantially hyperbolic forward portion 6 is unambiguously determined by the direction of the axis of the hyperbola as well as its focal length.
  • Reflector portion 4 extends below the source of light to reduce illumination from said source of light to points immediately in front of the lamp. If this extension of the reflector shade ends with a straight line parallel with light source 3 there would be an abrupt change on the working surface from darkness to light, and this is undesirable. For this reason the termination of reflector portion 4 in relation to light source 3 is not designed as a straight line, but in a V-shape the source of light being gradually covered outwards towards the edge. However, the light source is at all places covered beyond its central line. Such a gradual covering of the light source ensures illumination without shadows below the working lamp with a gradual increase of light intensity as shown in Figure 2.
  • the forward reflector portion 6 is constructed and calculated on the basis of a parabolic basic form with a cut-off direction of 45°.
  • the forward portion 6 of the reflector 1 and the rear portion 8 thereof are joined at line 5 in a valley shape as indicated in Figure 1. This will reduce the efficiency of the lamp somewhat but it also reduces the focal length of the hyperbolic curve with the result that the amount of light at disposal is displaced further away in the working area, cf. the illumination curve in Figure 2 showing the preferred embodiment with curve I, and with curve II showing the illumination of the working area without the special joining of the front and the rear reactor portions and without a louver arrangement.
  • non-reflecting louver lamellae 2 e.g. painted black,are provided at this portion of the lamp.
  • Said lamellae may be arranged at various angles relative to the perpendicular 9 to the table surface. Angles between 30° and 70° may be used, but the most suitable angle is 56,3°.
  • the foremost portion of the reflector being removed, the lamp may be displaced closer to the working area and the lamp can still be provided at eye level without any hazard of glare.
  • the intensity of illumination of the working area may be somewhat increased.
  • the rear reflector portion was made of a conductive material, this could interfere with the discharge in the PL-lamp. This is probably due to the fact that the discharges in said fluorescent lamp create a magnetic field inducing an eddy current in the material, which in turn creates a magnetic field having an effect on the discharge.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Glass Compositions (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Claims (7)

  1. Einrichtung für asymmetrische Beleuchtung, umfassend einen Reflektor (1) in Form einer zylindrischen Fläche mit einem vorderen, im wesentlichen hyperbolischen Teil (6) und einem einer länglichen Lichtquelle, deren Längsachse im wesentlichen parallel zu den Erzeugenden der Fläche ausgerichtet ist, benachbarten hinteren Teil (8),
    dadurch gekennzeichnet,
    daß der vordere Teil (6) des Reflektors (1) aus dreieckigen Facetten (10) mit in bezug zur Längsrichtung der Lichtquelle (3) geneigten Grenzlinien besteht, und daß der hintere Teil (8) des Reflektors (1) in der Nähe, jedoch im Abstand von dem hinteren Teil der Lichtquelle (3) angeordnet ist und diese umschließt und einen unteren vorderen Randabschnitt (4) umfaßt, der im Betrieb die Zone unmittelbar unter der Lichtquelle abschirmt.
  2. Einrichtung nach Anspruch 1,
    dadurch gekennzeichnet,
    daß der vordere Abschnitt (6) des Reflektors (1) an dem der Lichtquelle (3) gegenüberliegenden Ende mit einer oder mehreren Jalousielamellen (2) versehen ist.
  3. Einrichtung nach Anspruch 2,
    dadurch gekennzeichnet,
    daß die Jalousielamellen (2) in einem Winkel ( α ), vorzugsweise von 56,3°, zur Senkrechten (9) einer unter dem Reflektor (1) befindlichen Arbeitsfläche geneigt sind.
  4. Einrichtung nach einem der Ansprüche 1-3,
    dadurch gekennzeichnet,
    daß der hintere Abschnitt (8) des Reflektors (1) in einem Abstand im Bereich von 1-3 mm, vorzugsweise 2 mm, von der Lichtquelle (3) angeordnet ist.
  5. Einrichtung nach Anspruch 1,
    dadurch gekennzeichnet,
    daß der Reflektor (1) mit Seitenspiegeln versehen ist, und zwar einem an jeder Seite des Reflektors.
  6. Einrichtung nach Anspruch 5,
    dadurch gekennzeichnet,
    daß die Seitenspiegel gegenseitig geneigt sind, wobei die kleinste Öffnung zwischen ihnen in der Nähe der Lichtquelle (3) liegt.
  7. Einrichtung nach einem der Ansprüche 1-6,
    dadurch gekennzeichnet,
    daß sich der untere vordere Randabschnitt (4) unterhalb der Lichtquelle (3) mindestens durch eine senkrechte, die Mittelachse der Lichtquelle (3) einschließende Ebene erstreckt, wobei das Ende des unteren vorderen Randabschnitts (4) nicht zu der genannten Achse parallel sondern vorzugsweise V-förmig ist, so daß eine zunehmende Abschirmung der Lichtquelle (3) geschaffen wird.
EP86850137A 1985-04-19 1986-04-16 Einrichtung für asymmetrische Beleuchtung Expired - Lifetime EP0198811B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO851583A NO157836C (no) 1985-04-19 1985-04-19 Anordning ved asymmetrisk belysning.
NO851583 1985-04-19

Publications (3)

Publication Number Publication Date
EP0198811A2 EP0198811A2 (de) 1986-10-22
EP0198811A3 EP0198811A3 (en) 1988-09-14
EP0198811B1 true EP0198811B1 (de) 1991-07-17

Family

ID=19888242

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86850137A Expired - Lifetime EP0198811B1 (de) 1985-04-19 1986-04-16 Einrichtung für asymmetrische Beleuchtung

Country Status (4)

Country Link
EP (1) EP0198811B1 (de)
DE (1) DE3680230D1 (de)
DK (1) DK165196C (de)
NO (1) NO157836C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102444863A (zh) * 2010-10-11 2012-05-09 欧司朗有限公司 反射器以及具有该反射器的灯具

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MY141867A (en) 2002-06-20 2010-07-16 Vertex Pharma Substituted pyrimidines useful as protein kinase inhibitors

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191025371A (en) * 1910-11-01 1911-11-01 Samuel Weeks Maddick Methods of and the Means for the Electric Lighting of Pictures, Works of Art, and the like.
FR747292A (fr) * 1932-03-09 1933-06-14 Lumi Or Projecteur
DE2912766C2 (de) * 1979-03-30 1981-11-12 Siemens AG, 1000 Berlin und 8000 München Tischleuchte für röhrenförmige Leuchtstofflampen
US4379322A (en) * 1981-03-27 1983-04-05 Mcgraw-Edison Company Compound reflector for luminaire
FR2515369A1 (fr) * 1981-10-23 1983-04-29 Baliozian Mardick Panneau modulaire en matiere plastique diffuseur ou reflecteur de lumiere pour la photographie, le cinema, la television et l'eclairage de locaux, et dispositif obtenu par l'assemblage de plusieurs de ces panneaux

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102444863A (zh) * 2010-10-11 2012-05-09 欧司朗有限公司 反射器以及具有该反射器的灯具
CN102444863B (zh) * 2010-10-11 2015-07-15 欧司朗股份有限公司 反射器以及具有该反射器的灯具

Also Published As

Publication number Publication date
DK165196B (da) 1992-10-19
NO851583L (no) 1986-10-20
DK180286D0 (da) 1986-04-18
NO157836B (no) 1988-02-15
DK180286A (da) 1986-10-20
EP0198811A3 (en) 1988-09-14
EP0198811A2 (de) 1986-10-22
DE3680230D1 (de) 1991-08-22
NO157836C (no) 1988-05-25
DK165196C (da) 1993-03-15

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