EP0017146B1 - Table lamp for fluorescent tubes - Google Patents

Table lamp for fluorescent tubes Download PDF

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Publication number
EP0017146B1
EP0017146B1 EP80101578A EP80101578A EP0017146B1 EP 0017146 B1 EP0017146 B1 EP 0017146B1 EP 80101578 A EP80101578 A EP 80101578A EP 80101578 A EP80101578 A EP 80101578A EP 0017146 B1 EP0017146 B1 EP 0017146B1
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EP
European Patent Office
Prior art keywords
angle
reflector
fluorescent lamp
longitudinal edge
housing
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
EP80101578A
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German (de)
French (fr)
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EP0017146A1 (en
Inventor
Horst Dipl.-Ing. Riehl
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Siemens AG
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Siemens AG
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Priority to AT80101578T priority Critical patent/ATE728T1/en
Publication of EP0017146A1 publication Critical patent/EP0017146A1/en
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Publication of EP0017146B1 publication Critical patent/EP0017146B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S6/00—Lighting devices intended to be free-standing
    • F21S6/002—Table lamps, e.g. for ambient lighting
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes

Definitions

  • the invention relates to a table lamp with a support and a housing enclosing a tubular fluorescent lamp and a mirror arrangement, in the light exit opening of which a grid with transverse lamellae extending transversely to the longitudinal axis of the housing is arranged, the support and housing being designed such that the longitudinal edges of the light exit opening and the fluorescent lamp runs parallel to the table level, the distance between the lower longitudinal edge of the housing from the table level is 50 to 85 cm and the light exit plane going through the longitudinal edges of the light exit opening with the table level includes an acute angle that opens towards the center of the table and the mirror arrangement is above the Fluorescent lamp running roof mirror with a main radiation direction of 40 ° ⁇ 10 ° against the horizontal and a rear-view mirror, the main radiation direction corresponds approximately to that of the roof mirror.
  • Such table lamps are preferably attached to the side of the work surface with their longitudinal axis parallel to the broad side of the work table; reflex glare can be practically completely avoided.
  • it must be ensured that the lamp or its mirror images cannot be seen above a certain shielding angle - measured against the horizontal; this shielding angle must be at least 5 ° for table lamps of the type mentioned.
  • the invention is therefore based on the object of developing a table lamp of the type mentioned in such a way that the smallest possible differences in luminance occur in the light exit opening and that, under given shielding conditions, a more uniform illumination of the table can be achieved with better lighting efficiency.
  • the additional mirror according to the invention not only ensures perfect shielding of the lamp above the required shielding angle; its mirrored top surface also brightens the area of the table surface that is far away from the light and thus provides more uniform illumination.
  • the additional mirror which is visible under normal viewing angles, is practically imperceptible to the observer, since thanks to its mirrored surface it does not stand out from the mirrors surrounding it (roof and rear-view mirrors).
  • the mirrored surface of the additional mirror contributes to an additional brightening of the areas of the transverse lamellae above the additional mirror, as a result of which the differences in luminance of these transverse lamellae can be considerably reduced.
  • the upper longitudinal edge of the additional mirror preferably lies on the upper tangential beam which extends between the upper longitudinal edge of the housing and the circumference of a fluorescent lamp with a diameter of 26 mm, its inclination being equal to the required shielding angle. This ensures proper shielding of the lamp at viewing angles smaller than the angle of the above-mentioned tangential beam at a low height of the lamp housing, without impairing the effectiveness of the roof mirror more than necessary.
  • the cross blades with a matt surface have the task of preventing glare when viewed parallel to perpendicular to the longitudinal axis of the lamp.
  • a further development of the invention further provides that the radial depth of the transverse lamellae measured on center rays of the fluorescent lamp is smaller in the case of center rays with an angle of inclination greater than 40 ° than at Center rays with an angle of inclination of less than 15 °. The more downward radiation from the lamp is thus little hampered by the relatively narrow transverse lamellae in this area.
  • transverse lamellae extend to a substantial extent beyond the light exit plane and in this way also allow the additional mirror to protrude from the light exit plane without this being apparent.
  • this makes it possible to dimension the distance of the additional mirror from the upper longitudinal edge of the housing only so large that the uniformity of the luminance L min to L max of the transverse slats in front of the additional mirror is better than 1: 3.
  • this allows the area of the roof mirror covered by the upper part of the additional mirror to be kept very small.
  • the upper longitudinal edge of the additional mirror should lie on a center beam of the lamp, which, with the center beam running through the upper housing longitudinal edge, includes a maximum coverage angle of 15 °, in particular 10 °.
  • a further improvement in the uniformity of the illumination of a table surface can also be achieved if the inclination of the additional mirror is chosen so that the angle of the center beam of the mirror image of the lamp through the upper longitudinal edge of the additional mirror is equal to or less than 70 °: Illuminance increased in the transition area between the table surfaces illuminated directly and by the roof mirror. Finally, it has proven advantageous to choose the angle of the main emission direction of the side mirror to be smaller than that of the roof mirror.
  • Fig. 1 the assignment of a table lamp 2 with a lamp housing 21 to a table 1 with the table level 11 is shown on a smaller scale.
  • the lamp housing 21 is held on the table top 1 by means of a support 26 and with the aid of fastening means 27.
  • the dimensions are given in cm.
  • the viewing angle a is also given. From the drawn eye position 10 of a person sitting at a neighboring table 1 '(arranged in an L-shape), the condition results that the shielding angle of the table lamp must be at least 5 °, i.e. the lamp or lamp images may only be visible from a larger viewing angle.
  • cross-sectionally closed, channel-shaped housing 21 has a light exit opening delimited by an upper longitudinal edge 211 and a lower longitudinal edge 212, so that the light exit plane 210 forms an angle of approximately 12 ° with the horizontal when the table lamp is in the way shown in Fig. 1 is connected to the table.
  • this housing a likewise trough-shaped mirror arrangement with a roof mirror 22 and a rear-side mirror 23 is accommodated.
  • the tubular fluorescent lamp 20 is held within this mirror arrangement.
  • a rectangular, flat additional mirror 24 Arranged between the upper longitudinal edge of the housing 211 and the lamp 20 is a rectangular, flat additional mirror 24, which likewise extends parallel to the lamp 20 and whose upper side 240 is also designed to be reflective. Its upper longitudinal edge 241 lies on the upper tangential beam 204 of the lamp 20 through the upper longitudinal housing edge 211.
  • the lower longitudinal edge 242 of the additional mirror lies on a lower tangential beam 207 with an inclination angle of 7 °, so that the shielding condition is fulfilled with certainty.
  • the angle of inclination ⁇ of the additional mirror 24 is approximately 30 °; a value for the angle y of the center beam 203 of the mirror image 20 'of the lamp through the upper longitudinal edge 241 is 66 °, which is less than 70 °. With this inclination of the additional mirror, the desired increase in illuminance results in the transition area between the table surfaces that are only directly illuminated and those illuminated by the roof mirror.
  • the additional mirror 24 is arranged within the housing 21 so that its upper longitudinal edge 241 lies at the intersection of a center beam 205 with the tangential beam 204, the angle 8 of which should be as small as possible against the center beam 206 going through the upper housing longitudinal edge 211.
  • the additional mirror should be at least such a large distance from the outer longitudinal edge 211 of the housing that the uniformity of the luminance Lmln to L max of the transverse lamellae 25 of the grid in front of the additional mirror is better than 1: 3.
  • transverse lamellae are 20 mm apart and have a different radial depth T, measured on center rays originating from the lamp: In the region of center rays with an inclination angle greater than 40 °, this radial depth is smaller than in the region of center rays with an inclination angle below 15 °; in the latter range it lies between 40% and 50% of the length of the center beam 206 running through the upper longitudinal edge 211 of the housing.
  • the rear-side mirror 23 is essentially a section of a parabola with a focal length of 25 mm and an angle of inclination A of the main axis 230 of 35 °, this rear-side mirror extending from the lower longitudinal housing edge 212 to the apex of this parabola and the lamp 20 with its The center is located at the focal point.
  • the roof mirror 22 consists of an inner part 222 and an outer part 221; the latter is essentially a section of a parabola with a focal length of 15 mm and an inclination angle ⁇ of the main axis 220 of 40 °.
  • This outer part 221 extends approximately from the upper longitudinal edge 211 of the housing to the center beam 201, which is perpendicular to the imaginary extension of the additional mirror 24; from here, the inner part 221 is essentially continuously curved up to the apex of the side mirror 23.
  • the roof mirror 22 is arranged such that the center of the lamp 20 lies at the focal point of the parabola defining the outer part 221.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)
  • Liquid Crystal Substances (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)
  • Lasers (AREA)
  • Freezers Or Refrigerated Showcases (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)

Abstract

1. A table light (2) with a support (26) and a housing (21) which surrounds a tubular fluorescent lamp (20) and a reflector arrangement, and in whose light outlet aperture there is arranged a grid provided with transverse laminations (25) that extend transversely with respect to the longitudinal axis of the housing, wherein the support (26) and the housing (21) are so designed that the longitudinal edges of the light outlet aperture and the fluorescent lamp (20) run parallel to the plane of the table, the distance of the lower longitudinal edge of the housing from the plane of the table having a value from 50 to 85 cm, and the light outlet plane which passes through the longitudinal edges of the light outlet aperture forms an acute angle with respect to the plane of table, which angle opens towards the centre of the table, and wherein the reflector arrangement possesses a top reflector (22) extending above the fluorescent lamp (20) and which possesses a main radiation direction of 40 degrees +- 10 degrees relative to the horizontal and further possesses a rear reflector (23) whose main radiation direction corresponds approximately to that of the top reflector (22), characterised in that one single rectangular, flat additional reflector (24) which also has a reflective upper surface (240) is arranged parallel to the fluorescent lamp (20) between the latter and the upper housing longitudinal edge (211) with an angle of inclination (beta) relative to the horizontal which is up to 15 degrees smaller than the angle (vtheta) of the main radiation direction (220) of the top reflector (22), and wherein the width of the additional reflector (24) is such that the fluorescent lamp (20) is entirely covered above the requisite screening angle and wherein its upper longitudinal edge (241) lies on or above a boundary line (204) which runs through the upper housing longitudinal edge (211) with the inclination of the screening angle.

Description

Die Erfindung betrifft eine Tischleuchte mit einer Stütze und einem, eine röhrenförmige Leuchtstofflampe und eine Spiegelanordnung umschließenden Gehäuse, in dessen Lichtaustrittsöffnung ein Raster mit quer zur Längsachse des Gehäuses verlaufenden Querlamellen angeordnet ist, wobei Stütze und Gehäuse so ausgebildet sind, daß die Längskanten der Lichtaustrittsöffnung und die Leuchtstofflampe parallel zur Tischebene verlaufen, der Abstand der unteren Längskante des Gehäuses von der Tischebene 50 bis 85 cm beträgt und die durch die Längskanten der Lichtaustrittsöffnung gehende Lichtaustrittsebene mit der Tischebene einen zur Tischmitte hin sich öffnenden spitzen Winkel einschließt und wobei die Spiegelanordnung einen oberhalb der Leuchtstofflampe verlaufenden Dachspiegel mit einer Hauptausstrahlungsrichtung von 40° ± 10° gegen die Horizontale und einen Rückseitenspiegel aufweist, dessen Hauptausstrahlungsrichtung etwa der des Dachspiegels entspricht.The invention relates to a table lamp with a support and a housing enclosing a tubular fluorescent lamp and a mirror arrangement, in the light exit opening of which a grid with transverse lamellae extending transversely to the longitudinal axis of the housing is arranged, the support and housing being designed such that the longitudinal edges of the light exit opening and the fluorescent lamp runs parallel to the table level, the distance between the lower longitudinal edge of the housing from the table level is 50 to 85 cm and the light exit plane going through the longitudinal edges of the light exit opening with the table level includes an acute angle that opens towards the center of the table and the mirror arrangement is above the Fluorescent lamp running roof mirror with a main radiation direction of 40 ° ± 10 ° against the horizontal and a rear-view mirror, the main radiation direction corresponds approximately to that of the roof mirror.

Solche Tischleuchten werden vorzugsweise seitlich der Arbeitsfläche mit ihrer Längsachse parallel zur Breitseite des Arbeitstisches befestlgt ; dabei lassen sich Reflexblendungen praktisch vollständig vermeiden. Andererseits ist sicherzustellen, daß die Lampe oder ihre Spiegelbilder oberhalb eines bestimmten Abschirmwinkels - gemessen gegen die Horizontale - nicht zu sehen sind ; dieser Abschirmwinkel muß bei Tischleuchten der eingangs genannten Art mindestens 5° betragen.Such table lamps are preferably attached to the side of the work surface with their longitudinal axis parallel to the broad side of the work table; reflex glare can be practically completely avoided. On the other hand, it must be ensured that the lamp or its mirror images cannot be seen above a certain shielding angle - measured against the horizontal; this shielding angle must be at least 5 ° for table lamps of the type mentioned.

Um einen Arbeitstisch von der Seite her mit einer Tischleuchte der angegebenen Art mit ausreichender Gleichmässigkeit ausleuchten zu können, müssen erhebliche Lichtanteile unter einem Winkel von 25° aus dem Gehäuse austreten können (alle Winkelangaben beziehen sich auf die Horizontale, sofern nichts anderes angegeben ist). Will man mit einer dafür geeigneten Spiegeloptik den Lichtstrom der Lampe möglichst verlustfrei auf die Tischfläche bringen und zugleich die Bedingungen der Blendungsbegrenzung erfüllen, so erfordert dies auch bei Vorhandensein von Querlamellen ein ziemlich unförmiges, breites Gehäuse. Um dies zu vermeiden, hat man bei einer bekannten Leuchte die Lichtaustrittsebene etwas schräg gestellt und zur Blendungsbegrenzung in der Lichtaustrittsöffnung zusätzliche Längslamellen angeordnet.In order to be able to illuminate a work table from the side with a table lamp of the specified type with sufficient uniformity, considerable amounts of light must be able to emerge from the housing at an angle of 25 ° (all angles refer to the horizontal, unless otherwise stated). If you want to bring the luminous flux of the lamp to the table surface with as little loss as possible and at the same time meet the conditions of glare limitation with a suitable mirror optic, this requires a rather bulky, wide housing, even if cross blades are present. In order to avoid this, the light exit plane has been set somewhat obliquely in a known luminaire and additional longitudinal slats have been arranged in the light exit opening to limit glare.

Diese Maßnahmen wirken sich jedoch ungünstig auf den Wirkungsgrad und auf den in Richtung des Hauptarbeitsbereiches des Tisches umlenkbaren Lichtstrom aus. Das gilt selbst dann, wenn die Lamellen an der Unterseite verspiegelt sind, da sie sich gegenseitig im Wege stehen.However, these measures have an unfavorable effect on the efficiency and on the luminous flux which can be deflected in the direction of the main working area of the table. This applies even if the slats are mirrored on the underside, since they are in the way of each other.

Aus der US-A 2 560 281 ist andererseits 'eine Arbeitsplatzleuchte mit mindestens einer Leuchtstofflampe und mindestens einer Längslamelle bekannt, die auf ihrer Unterseite reflektierend, auf ihrer Oberseite jedoch nicht reflektierend ausgebildet ist. Das bedeutet, daß der vom Dachspiegel auf diese Oberseite fallende Lichtstromanteil praktisch verlorengeht und daß sich die Längslamelle für den Betrachter deutlich von dem dahinterliegenden Dach- und Rückseitenspiegel abhebt, woraus große Leuchtdichteunterschiede resultieren.From US-A 2 560 281, on the other hand , a workplace lamp with at least one fluorescent lamp and at least one longitudinal lamella is known, which is reflective on its underside but not reflective on its top. This means that the luminous flux portion falling from the roof mirror onto this upper side is practically lost and that the longitudinal lamella stands out clearly for the viewer from the roof and rear-view mirror behind it, which results in large differences in luminance.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Tischleuchte der eingangs genannten Art so weiterzubilden, daß in der Lichtaustrittsöffnung möglichst geringe Leuchtdichteunterschiede auftreten und daß sich bei gegebenen Abschirmbedingungen eine gleichmäßigere Ausleuchtung des Tisches bei besserem Leuchtenwirkungsgrad erzielen läßt.The invention is therefore based on the object of developing a table lamp of the type mentioned in such a way that the smallest possible differences in luminance occur in the light exit opening and that, under given shielding conditions, a more uniform illumination of the table can be achieved with better lighting efficiency.

Die Lösung dieser Aufgabe ist durch die im Anspruch 1 angegebenen Merkmale gekennzeichnet.The solution to this problem is characterized by the features specified in claim 1.

Der erfindungsgemäße Zusatzspiegel sorgt nicht nur für eine einwandfreie Abschirmung der Lampe oberhalb des jeweils geforderten Abschirmwinkels ; seine verspiegelte Oberseite bringt zusätzlich eine Aufhellung des leuchtenfernen Bereiches der Tischfläche und somit eine gleichmäßigere Ausleuchtung. Von besonderer Bedeutung ist aber der Umstand, daß der unter normalen Blickwinkeln sichtbare Zusatzspiegel für den Beobachter praktisch nicht wahrnehmbar ist, da er sich dank seiner verspiegelten Oberfläche von den ihn umgebenden Spiegeln (Dach- und Rückseitenspiegel) nicht abhebt. Schließlich trägt die verspiegelte Oberfläche des Zusatzspiegels zu einer zusätzlichen Aufhellung der oberhalb des Zusatzspiegels liegenden Bereiche der Querlamellen bei, wodurch sich die Leuchtdichteunterschiede dieser Querlamellen erheblich reduzieren lassen.The additional mirror according to the invention not only ensures perfect shielding of the lamp above the required shielding angle; its mirrored top surface also brightens the area of the table surface that is far away from the light and thus provides more uniform illumination. Of particular importance, however, is the fact that the additional mirror, which is visible under normal viewing angles, is practically imperceptible to the observer, since thanks to its mirrored surface it does not stand out from the mirrors surrounding it (roof and rear-view mirrors). Finally, the mirrored surface of the additional mirror contributes to an additional brightening of the areas of the transverse lamellae above the additional mirror, as a result of which the differences in luminance of these transverse lamellae can be considerably reduced.

Vorzugsweise liegt die obere Längskante des Zusatzspiegels auf dem oberen Tangentialstrahl, der sich zwischen der oberen Gehäuselängskante und dem Umfang einer Leuchtstofflampe mit einem Durchmesser von 26 mm erstreckt, wobei seine Neigung gleich dem geforderten Abschirmwinkel ist. Dadurch läßt sich eine einwandfreie Abschirmung der Lampe bei Blickwinkeln kleiner als der Winkel des genannten Tangentialstrahles bei geringer Höhe des Leuchtengehäuses sicherstellen, ohne die Wirksamkeit des Dachspiegels mehr als notwendig zu beeinträchtigen.The upper longitudinal edge of the additional mirror preferably lies on the upper tangential beam which extends between the upper longitudinal edge of the housing and the circumference of a fluorescent lamp with a diameter of 26 mm, its inclination being equal to the required shielding angle. This ensures proper shielding of the lamp at viewing angles smaller than the angle of the above-mentioned tangential beam at a low height of the lamp housing, without impairing the effectiveness of the roof mirror more than necessary.

Während der Zusatzspiegel für eine Blendungsbegrenzung bei einer Blickrichtung senkrecht zur Leuchtenlängsachse sorgt, haben die mit matter Oberfläche ausgeführten Querlamellen die Aufgabe, eine Blendung bei Blickrichtungen parallel bis senkrecht zur Leuchtenlängsachse zu verhindern. Zur Reduzierung der mit der Zahl und der Fläche der Querlamellen steigenden Verluste ist gemäß einer Weiterbildung der Erfindung weiter vorgesehen, daß die auf Mittelpunktstrahlen der Leuchtstofflampe gemessene radiale Tiefe der Querlamellen bei Mittelpunktstrahlen mit einem Neigungswinkel größer 40° kleiner ist als bei Mittelpunktstrahlen mit einem Neigungswinkel unter 15°. Die mehr nach unten gerichtete Strahlung der Lampe wird somit durch die in diesem Bereich verhältnismäßig schmal ausgebildeten Querlamellen wenig behindert. Diese Querlamellen erstrecken sich zu einem wesentlichen Teil über die Lichtaustrittsebene hinaus und erlauben es auf diese Weise, auch den Zusatzspiegel aus der Lichtaustrittsebene herausragen zu lassen, ohne daß dies ins Auge fällt. Damit ist es aber möglich, den Abstand des Zusatzspiegels von der oberen Gehäuselängskante nur so groß zu bemessen, daß die Gleichmäßigkeit der Leuchtdichte Lmin zu Lmax der Querlamellen vor dem Zusatzspiegel besser als 1 : 3 ist. Dadurch läßt sich andererseits der vom oberen Teil des Zusatzspiegels abgedeckte Bereich des Dachspiegels sehr klein halten. Aus dem gleichen Grund sollte die obere Längskante des Zusatzspiegels auf einem Mittelpunktstrahl der Lampe liegen, der mit dem durch die obere Gehäuselängskante verlaufenden Mittelpunktstrahl einen Abdeckwinkel von maximal 15°, insbesondere 10°, einschließt.While the additional mirror provides glare limitation when looking perpendicular to the longitudinal axis of the lamp, the cross blades with a matt surface have the task of preventing glare when viewed parallel to perpendicular to the longitudinal axis of the lamp. In order to reduce the losses that increase with the number and area of the transverse lamellae, a further development of the invention further provides that the radial depth of the transverse lamellae measured on center rays of the fluorescent lamp is smaller in the case of center rays with an angle of inclination greater than 40 ° than at Center rays with an angle of inclination of less than 15 °. The more downward radiation from the lamp is thus little hampered by the relatively narrow transverse lamellae in this area. These transverse lamellae extend to a substantial extent beyond the light exit plane and in this way also allow the additional mirror to protrude from the light exit plane without this being apparent. However, this makes it possible to dimension the distance of the additional mirror from the upper longitudinal edge of the housing only so large that the uniformity of the luminance L min to L max of the transverse slats in front of the additional mirror is better than 1: 3. On the other hand, this allows the area of the roof mirror covered by the upper part of the additional mirror to be kept very small. For the same reason, the upper longitudinal edge of the additional mirror should lie on a center beam of the lamp, which, with the center beam running through the upper housing longitudinal edge, includes a maximum coverage angle of 15 °, in particular 10 °.

Eine weitere Verbesserung in der in Gleichmäßigkeit der Ausleuchtung einer Tischfläche läßt sich ferner erzielen, wenn die Neigung des Zusatzspiegels so gewählt wird, daß der Winkel des Mittelpunktstrahles des Spiegelbildes der Lampe durch die obere Längskante des Zusatzspiegels gleich oder kleiner 70° ist : Dadurch wird die Beleuchtungsstärke in dem Übergangsbereich zwischen den nur direkt und den vom Dachspiegel ausgeleuchteten Tischflächen angehoben. Schließlich hat es sich als vorteilhaft erwiesen, den Winkel der Hauptausstrahlungsrichtung des Seitenspiegels kleiner als den des Dachspiegels zu wählen.A further improvement in the uniformity of the illumination of a table surface can also be achieved if the inclination of the additional mirror is chosen so that the angle of the center beam of the mirror image of the lamp through the upper longitudinal edge of the additional mirror is equal to or less than 70 °: Illuminance increased in the transition area between the table surfaces illuminated directly and by the roof mirror. Finally, it has proven advantageous to choose the angle of the main emission direction of the side mirror to be smaller than that of the roof mirror.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen gekennzeichnet.Further advantageous embodiments of the invention are characterized in the subclaims.

Ein Ausführungsbeispiel der Erfindung wird anhand der Figuren erläutert ; es zeigen

  • Fig. 1 die Seitenansicht einer Tischplatte mit daran befestigter Tischleuchte und
  • Fig. 2 einen Querschnitt durch das Gehäuse der Tischleuchte.
An embodiment of the invention is explained with reference to the figures; show it
  • Fig. 1 is a side view of a table top with a table lamp and attached
  • Fig. 2 shows a cross section through the housing of the table lamp.

In Fig. 1 ist in verkleinertem Maßstab die Zuordnung einer Tischleuchte 2 mit einem Leuchtengehäuse 21 zu einem Tisch 1 mit der Tischebene 11 dargestellt. Das Leuchtengehäuse 21 ist mittels einer Stütze 26 und mit Hilfe von Befestigungsmitteln 27 an der Tischplatte 1 gehaltert. Die Maße sind in cm angegeben. Schließlich sind die Neigungswinkel der wichtigsten Strahlen, insbesondere die der Grenzen und der Mitte des Hauptarbeitsbereiches 12 eingetragen. Ferner ist der Blickwinkel a angegeben. Aus der gezeichneten Augenposition 10 einer an einem Nachbartisch 1' (L-förmig angeordnet) sitzenden Person resultiert die Bedingung, daß der Abschirmwinkel der Tischleuchte mindestens 5° betragen muß, d.h., die Lampe oder Lampenbilder nur bei größerem Blickwinkel sichtbar sein darf.In Fig. 1, the assignment of a table lamp 2 with a lamp housing 21 to a table 1 with the table level 11 is shown on a smaller scale. The lamp housing 21 is held on the table top 1 by means of a support 26 and with the aid of fastening means 27. The dimensions are given in cm. Finally, the angles of inclination of the most important rays, in particular those of the boundaries and the center of the main working area 12, are entered. The viewing angle a is also given. From the drawn eye position 10 of a person sitting at a neighboring table 1 '(arranged in an L-shape), the condition results that the shielding angle of the table lamp must be at least 5 °, i.e. the lamp or lamp images may only be visible from a larger viewing angle.

Das in Fig. 2 im Querschnitt gezeigte, stirnseitig abgeschlossene, rinnenförmige Gehäuse 21 hat eine durch eine obere Längskante 211 und eine untere Längskante 212 begrenzte Lichtaustrittsöffnung, so daß die Lichtaustrittsebene 210 mit der Horizontalen einen Winkel von etwa 12° einschließt, wenn die Tischleuchte in der in Fig. 1 gezeichneten Weise mit dem Tisch verbunden ist. In diesem Gehäuse ist eine ebenfalls rinnenförmige Spiegelanordnung mit einem Dachspiegel 22 und einem Rückseitenspiegel 23 untergebracht. Innerhalb dieser Spiegelanordnung ist die röhrenförmige Leuchtstofflampe 20 gehaltert.2, cross-sectionally closed, channel-shaped housing 21 has a light exit opening delimited by an upper longitudinal edge 211 and a lower longitudinal edge 212, so that the light exit plane 210 forms an angle of approximately 12 ° with the horizontal when the table lamp is in the way shown in Fig. 1 is connected to the table. In this housing a likewise trough-shaped mirror arrangement with a roof mirror 22 and a rear-side mirror 23 is accommodated. The tubular fluorescent lamp 20 is held within this mirror arrangement.

Zwischen der oberen Gehäuselängskante 211 und der Lampe 20 ist ein rechteckiger ebener Zusatzspiegel 24 angeordnet, der sich ebenfalls parallel zur Lampe 20 erstreckt und dessen Oberseite 240 ebenfalls spiegelnd ausgebildet ist. Seine obere Längskante 241 liegt auf dem oberen Tangentialstrahl 204 der Lampe 20 durch die obere Gehäuselängskante 211. Die untere Längskante 242 des Zusatzspiegels liegt auf einem unteren Tangentialstrahl 207 mit einem Neigungswinkel von 7°, so daß die Abschirmbedingung mit Sicherheit erfüllt ist. Der Neigungswinkel β des Zusatzspiegels 24 ist etwa 30° ; dabei ergibt sich für den Winkel y des Mittelpunktstrahles 203 des Spiegelbildes 20' der Lampe durch die obere Längskante 241 mit 66° ein Wert, der kleiner als 70° ist. Bei dieser Neigung des Zusatzspiegels ergibt sich die angestrebte Erhöhung der Beleuchtungsstärke im Übergangsbereich zwischen den nur direkt und den vom Dachspiegel ausgeleuchteten Tischflächen.Arranged between the upper longitudinal edge of the housing 211 and the lamp 20 is a rectangular, flat additional mirror 24, which likewise extends parallel to the lamp 20 and whose upper side 240 is also designed to be reflective. Its upper longitudinal edge 241 lies on the upper tangential beam 204 of the lamp 20 through the upper longitudinal housing edge 211. The lower longitudinal edge 242 of the additional mirror lies on a lower tangential beam 207 with an inclination angle of 7 °, so that the shielding condition is fulfilled with certainty. The angle of inclination β of the additional mirror 24 is approximately 30 °; a value for the angle y of the center beam 203 of the mirror image 20 'of the lamp through the upper longitudinal edge 241 is 66 °, which is less than 70 °. With this inclination of the additional mirror, the desired increase in illuminance results in the transition area between the table surfaces that are only directly illuminated and those illuminated by the roof mirror.

Der Zusatzspiegel 24 ist innerhalb des Gehäuses 21 so angeordnet, daß seine obere Längskante 241 im Schnittpunkt eines Mittelpunktstrahles 205 mit dem Tangentialstrahl 204 liegt, dessen Winkel 8 gegen den durch die obere Gehäuselängskante 211 gehende Mittelpunktstrahl 206 möglichst klein sein soll. Andererseits soll der Zusatzspiegel wenigstens einen so gro-βen Abstand von der äußeren Gehäuselängskante 211 haben, daß die Gleichmäßigkeit der Leuchtdichte Lmln zu Lmax der Querlamellen 25 des Rasters vor dem Zusatzspiegel besser als 1 : 3 ist.The additional mirror 24 is arranged within the housing 21 so that its upper longitudinal edge 241 lies at the intersection of a center beam 205 with the tangential beam 204, the angle 8 of which should be as small as possible against the center beam 206 going through the upper housing longitudinal edge 211. On the other hand, the additional mirror should be at least such a large distance from the outer longitudinal edge 211 of the housing that the uniformity of the luminance Lmln to L max of the transverse lamellae 25 of the grid in front of the additional mirror is better than 1: 3.

Diese Querlamellen haben einen Abstand von 20 mm voneinander und weisen eine unterschiedliche radiale Tiefe T, gemessen auf von der Lampe ausgehenden Mittelpunktstrahlen, auf : Im Bereich von Mittelpunktstrahlen mit einem Neigungswinkel größer 40° ist diese radiale Tiefe kleiner als im Bereich von Mittelpunktstrahlen mit einem Neigungswinkel unter 15° ; in dem zuletzt genannten Bereich liegt sie zwischen 40 % und 50 % der Länge des durch die obere Gehäuselängskante 211 verlaufenden Mittelpunktstrahles 206.These transverse lamellae are 20 mm apart and have a different radial depth T, measured on center rays originating from the lamp: In the region of center rays with an inclination angle greater than 40 °, this radial depth is smaller than in the region of center rays with an inclination angle below 15 °; in the latter range it lies between 40% and 50% of the length of the center beam 206 running through the upper longitudinal edge 211 of the housing.

Da die Unterkante der Querlamellen weitgehend parallel zu der Oberseite des Gehäuses 21 verläuft und die Längsseite von Gehäuse und Querlamellen in Stirnansicht etwa einen Halbkreis bilden, resultiert daraus eine eigentümliche Form der Querlamellen, die etwa dem Seitenprofil eines Pfeifenkopfes entspricht.Since the lower edge of the transverse lamellae runs largely parallel to the upper side of the housing 21 and the longitudinal side of the housing and transverse lamellae form approximately a semicircle in the end view, a peculiar result results from this Shape of the transverse fins, which corresponds approximately to the side profile of a pipe bowl.

Der Rückseitenspiegel 23 ist im wesentlichen ein Abschnitt aus einer Parabel mit einer Brennweite von 25 mm und einem Neigungswinkel A der Hauptachse 230 von 35°, wobei dieser Rückseitenspiegel sich von der unteren Gehäuselängskante 212 bis zu dem Scheitel dieser Parabel erstreckt und die Lampe 20 mit ihrem Mittelpunkt im Brennpunkt angeordnet ist.The rear-side mirror 23 is essentially a section of a parabola with a focal length of 25 mm and an angle of inclination A of the main axis 230 of 35 °, this rear-side mirror extending from the lower longitudinal housing edge 212 to the apex of this parabola and the lamp 20 with its The center is located at the focal point.

Der Dachspiegel 22 besteht aus einem inneren Teil 222 und einem äußeren Teil 221 ; letzterer ist im wesentlichen ein Abschnitt aus einer Parabel mit einer Brennweite von 15 mm und einem Neigungswinkel ϑ der Hauptachse 220 von 40°. Dieser äußere Teil 221 erstreckt sich etwa von der oberen Gehäuselängskante 211 bis zu dem Mittelpunktstrahl 201, der auf der gedachten Verlängerung des Zusatzspiegels 24 senkrecht steht ; von hier aus verläuft der innere Teil 221 im wesentlichen stetig gekrümmt bis zu dem Scheitelpunkt des Seitenspiegels 23. Insgesamt ist der Dachspiegel 22 so angeordnet, daß der Mittelpunkt der Lampe 20 im Brennpunkt der den äußeren Teil 221 bestimmenden Parabel liegt. Da der Winkel β des Zusatzspiegels 24 mit 30° kleiner als der Winkel ϑ der Hauptausstrahlungsrichtung 220 des Dachspiegels 22 ist, werden Mittelpunktstrahlen in einem gewissen Winkelbereich auch von der Oberseite 240 des Zusatzspiegels 24 reflektiert, wie dies anhand des Strahles 202 dargestellt ist. Auf diese Weise entsteht ein Strahlenbündel mit einem Neigungswinkel kleiner β, also kleiner 30°, durch das das von der Tischleuchte entfernte Ende der Tischplatte aufgehellt wird.The roof mirror 22 consists of an inner part 222 and an outer part 221; the latter is essentially a section of a parabola with a focal length of 15 mm and an inclination angle ϑ of the main axis 220 of 40 °. This outer part 221 extends approximately from the upper longitudinal edge 211 of the housing to the center beam 201, which is perpendicular to the imaginary extension of the additional mirror 24; from here, the inner part 221 is essentially continuously curved up to the apex of the side mirror 23. Overall, the roof mirror 22 is arranged such that the center of the lamp 20 lies at the focal point of the parabola defining the outer part 221. Since the angle β of the additional mirror 24 is smaller by 30 ° than the angle ϑ of the main emission direction 220 of the roof mirror 22, center rays are also reflected in a certain angular range from the upper side 240 of the additional mirror 24, as is illustrated by the beam 202. In this way, a beam of rays is created with an angle of inclination of less than β, that is to say less than 30 °, by means of which the end of the table top remote from the table lamp is brightened.

Da bei der erfindungsgemäßen Tischleuchte alle Strahlen mit einem Winkel größer 7° austreten, erscheinen alle Spiegelflächen der Leuchte bei Betrachtung aus normaler Arbeitsposition dunkel. Mit einer Lampe mit 890 mm Länge und einem Lichtstrom von 1 350 Lumen wurde bei einer Anordnung nach Fig. 1 auf dem Tisch (Breite 80 cm) eine mittlere Horizontalbeleuchtungsstärke von 370 Lux (Meßraster 20 x 20 cm) und eine Gleichmäßigkeit von 1 : 5,7 erzielt ; der Anlagenwirkungsgrad erreichte 35 %.

Figure imgb0001
Figure imgb0002
 Since in the table lamp according to the invention all rays emerge at an angle greater than 7 °, all mirror surfaces of the lamp appear dark when viewed from a normal working position. With a lamp with a length of 890 mm and a luminous flux of 1,350 lumens, an arrangement according to FIG. 1 on the table (width 80 cm) provided an average horizontal illuminance of 370 lux (measuring grid 20 x 20 cm) and a uniformity of 1: 5 , 7 scored; the plant efficiency reached 35%.
Figure imgb0001
Figure imgb0002

Bezeichnung und Winkelangaben zu Strahlen und Ebenen : (Die Winkel sind gegen die Horizontale gemessen, wenn nicht ausdrücklich anders angegeben).

  • a Blickwinkel
  • β Neigung des Zusatzspiegels
  • 201 Mittelpunktstrahl senkrecht zur gedachten Verlängerung des Zusatzspiegels
  • 202 Mittelpunktstrahl über die Oberseite des Zusatzspiegels reflektiert
  • 203 Mittelpunktstrahl des Spiegelbildes der Lampe
  • y Zugehöriger Winkel
  • 204 oberer Tangentialstrahl
  • 205 Mittelpunktstrahl durch obere Längskante des Zusatzspiegels
  • 206 Mittelpunktstrahl durch obere Gehäuselängskante
  • 8 Abdeckwinkel, Winkel zwischen Mittelpunktstrahlen 205 und 206
  • 207 unterer Tangentialstrahl durch untere Längskante des Zusatzspiegels,
  • e zugehöriger Winkel
  • 210 Lichtaustrittsebene
  • η zugehöriger Winkel
  • 220 Hauptausstrahlungsrichtung des Dachspiegels,
  • ϑ zugehöriger Winkel
  • 230 Hauptausstrahlungsrichtung des Seitenspiegels,
  • λ zugehöriger Winkel
Description and angle information for rays and planes: (The angles are measured against the horizontal, unless expressly stated otherwise).
  • a perspective
  • β inclination of the additional mirror
  • 201 center beam perpendicular to the imaginary extension of the additional mirror
  • 202 Center beam reflected over the top of the auxiliary mirror
  • 203 Center beam of the mirror image of the lamp
  • y related angle
  • 204 upper tangential beam
  • 205 Center beam through the upper longitudinal edge of the additional mirror
  • 206 Center beam through the upper longitudinal edge of the housing
  • 8 coverage angles, angle between center rays 205 and 206
  • 207 lower tangential beam through the lower longitudinal edge of the additional mirror,
  • e associated angle
  • 210 light emission level
  • η associated angle
  • 220 main radiation direction of the roof mirror,
  • ϑ associated angle
  • 230 main emission direction of the side mirror,
  • λ associated angle

Claims (8)

1. A table light (2) with a support (26) and a housing (21) which surrounds a tubular fluorescent lamp (20) and a reflector arrangement, and in whose light outlet aperture there is arranged a grid provided with transverse laminations (25) that extend transversely with respect to the longitudinal axis of the housing, wherein the support (26) and the housing (21) are so designed that the longitudinal edges of the light outlet aperture and the fluorescent lamp (20) run parallel to the plane of the table, the distance of the lower longitudinal edge of the housing from the plane of the table having a value from 50 to 85cm, and the light outlet plane which passes through the longitudinal edges of the light outlet aperture forms an acute angle with respect to the plane of table, which angle opens towards the centre of the table, and wherein the reflector arrangement possesses a top reflector (22) extending above the fluorescent lamp (20) and which possesses a main radiation direction of 40°± 10° relative to the horizontal and further possesses a rear reflector (23) whose main radiation direction corresponds approximately to that of the top reflector (22), characterised in that one single rectangular, flat additional reflector (24) which also has a reflective upper surface (240) is arranged parallel to the fluorescent lamp (20) between the latter and the upper housing longitudinal edge (211) with an angle of inclination (p) relative to the horizontal which is up to 15° smaller than the angle (0) of the main radiation direction (220) of the top reflector (22), and wherein the width of the additional reflector (24) is such that the fluorescent lamp (20) is entirely covered above the requisite screening angle and wherein its upper longitudinal edge (241) lies on or above a boundary line (204) which runs through the upper housing longitudinal edge (211) with the inclination of the screening angle.
2. A table light as claimed in claim 1, characterised in that the inclination (β) of the additional reflector (24) is selected such that the angle (-y) of the centre point beam (203) of the mirror image (20') of the fluorescent lamp (20) through the upper longitudinal edge (241) of the additional reflector (24) relative to the horizontal is equal to or less than 70°.
3. A table light as claimed in claim 1 or claim 2, characterised in that the upper longitudinal edge (241) of the additional reflector (24) lies on a centre point beam (205) which forms a covering angle (8) having a maximum of 15° with the centre point beam (206) which passes through the upper housing longitudinal edge (211), and that this covering angle is at least of such magnitude that the uniformity Lmin to Lmax of the luminous intensity of the transverse laminations (25) preceding the additional reflector (24) is better than 1: 3.
4. A table light as claimed in claim 3, characterised in that the radial depth (T) of the transverse laminations (25) measured on centre point beams of the fluorescent lamp is smaller for centre point beams having an angle of inclination greater than 40° than for centre point beams having an angle of inclination less than 15°.
5. A table light as claimed in claim 4, characterised in that in the angular range below 15° the radial depth (T) of the transverse laminations (25) amounts to between 40 % and 50 % of the length of the centre point beam (206) of the fluorescent lamp which passes through the upper housing longitudinal edge (211).
6. A table light as claimed in one of claims 1 to 5, characterised in that the angle (X) of the main radiation direction (230) of the rear reflector (23) is smaller than the angle (ϑ) of the top reflector (22).
7. A table light as claimed in claim 6, characterised in that the rear reflector (23) is fundamentally the segment of a parabola having a focal length of 25 mm, that the angle (X) of its main radiation direction (230) amounts to 35°, that it is arranged such that the centre point of the fluorescent lamp (20) lies in the focal point of this parabola, where the rear reflector (23) extends between the lower housing longitudinal edge (212) and the apex of the parabola.
8. A table light as claimed in claim 7, characterised in that the top reflector (22) possesses an outer component (221) which is fundamentally the segment of a parabola having a focal length of 15 mm, that the angle (0) of its main radiation direction amounts to 40°±10°, and that it is arranged in such manner that the centre point of the fluorescent lamp (20) lies at the focal point of this parabola, wherein the outer component (221) extends between the upper housing longitudinal edge (211) and the centre point beam (201) which is arranged at right angles to the extension of the additional reflector (24).
EP80101578A 1979-03-30 1980-03-25 Table lamp for fluorescent tubes Expired EP0017146B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80101578T ATE728T1 (en) 1979-03-30 1980-03-25 TABLE LAMP FOR TUBULAR FLUORESCENT LAMPS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2912766 1979-03-30
DE2912766A DE2912766C2 (en) 1979-03-30 1979-03-30 Table lamp for tubular fluorescent lamps

Publications (2)

Publication Number Publication Date
EP0017146A1 EP0017146A1 (en) 1980-10-15
EP0017146B1 true EP0017146B1 (en) 1982-02-24

Family

ID=6066952

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80101578A Expired EP0017146B1 (en) 1979-03-30 1980-03-25 Table lamp for fluorescent tubes

Country Status (7)

Country Link
EP (1) EP0017146B1 (en)
AT (1) ATE728T1 (en)
DE (1) DE2912766C2 (en)
DK (1) DK146894C (en)
FI (1) FI64711C (en)
NO (1) NO150576C (en)
ZA (1) ZA801879B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9101774U1 (en) * 1991-02-15 1991-05-08 Siemens Ag, 8000 Muenchen, De

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO157836C (en) * 1985-04-19 1988-05-25 Jacobsen As J ASYMMETRIC LIGHTING DEVICE.
DE3711366A1 (en) * 1987-04-04 1988-10-27 Pohlschroeder & Co Kg Louvered luminaire for workplaces
DE4411891A1 (en) * 1994-04-07 1995-10-12 Ansorg Gmbh Reflector lamp
DE59609095D1 (en) * 1996-09-26 2002-05-23 Vh Lichttechnische Spezialgera reflecting device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190906836A (en) * 1909-03-22 1910-03-17 Gilbert Fox Allom Improvements in Electric Light Reflectors for Concentrating Light.
US2305721A (en) * 1940-08-15 1942-12-22 Farles Mfg Company Fluorescent tubular lamp
US2560281A (en) * 1945-11-29 1951-07-10 Sight Light Corp Luminaire with glare shielding means for producing an optimum distribution of light on a work surface
DE826469C (en) * 1948-10-02 1952-01-03 Siemens Schuckertwerke A G Table lamp for fluorescent lamps
FR2094504A5 (en) * 1970-06-23 1972-02-04 Holophane

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9101774U1 (en) * 1991-02-15 1991-05-08 Siemens Ag, 8000 Muenchen, De

Also Published As

Publication number Publication date
FI800835A (en) 1980-10-01
ZA801879B (en) 1981-08-26
DK146894B (en) 1984-01-30
FI64711B (en) 1983-08-31
DE2912766B1 (en) 1980-09-11
NO150576C (en) 1984-11-07
ATE728T1 (en) 1982-03-15
EP0017146A1 (en) 1980-10-15
NO150576B (en) 1984-07-30
DK146894C (en) 1984-07-16
FI64711C (en) 1983-12-12
DK130980A (en) 1980-10-01
NO800875L (en) 1980-10-01
DE2912766C2 (en) 1981-11-12

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