EP0017146B1 - Tischleuchte für röhrenförmige Leuchtstofflampen - Google Patents

Tischleuchte für röhrenförmige Leuchtstofflampen 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
Authority
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
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0017146A1 (de
Inventor
Horst Dipl.-Ing. Riehl
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to AT80101578T priority Critical patent/ATE728T1/de
Publication of EP0017146A1 publication Critical patent/EP0017146A1/de
Application granted granted Critical
Publication of EP0017146B1 publication Critical patent/EP0017146B1/de
Expired legal-status Critical Current

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Classifications

    • 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.

Landscapes

  • General Engineering & Computer Science (AREA)
  • Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Liquid Crystal Substances (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)
  • Freezers Or Refrigerated Showcases (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)
  • Lasers (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
EP80101578A 1979-03-30 1980-03-25 Tischleuchte für röhrenförmige Leuchtstofflampen Expired EP0017146B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80101578T ATE728T1 (de) 1979-03-30 1980-03-25 Tischleuchte fuer roehrenfoermige leuchtstofflampen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2912766 1979-03-30
DE2912766A DE2912766C2 (de) 1979-03-30 1979-03-30 Tischleuchte für röhrenförmige Leuchtstofflampen

Publications (2)

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

Family

ID=6066952

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80101578A Expired EP0017146B1 (de) 1979-03-30 1980-03-25 Tischleuchte für röhrenförmige Leuchtstofflampen

Country Status (7)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9101774U1 (de) * 1991-02-15 1991-05-08 Siemens AG, 8000 München Arbeitsplatzleuchte

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO157836C (no) * 1985-04-19 1988-05-25 Jacobsen As J Anordning ved asymmetrisk belysning.
DE3711366A1 (de) * 1987-04-04 1988-10-27 Pohlschroeder & Co Kg Rasterleuchte fuer arbeitsplaetze
DE4411891A1 (de) * 1994-04-07 1995-10-12 Ansorg Gmbh Reflektorleuchte
DE59609095D1 (de) * 1996-09-26 2002-05-23 Vh Lichttechnische Spezialgera Reflektionsvorrichtung

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 (de) * 1948-10-02 1952-01-03 Siemens Schuckertwerke A G Tischleuchte fuer Leuchtstofflampen
FR2094504A5 (fi) * 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 (de) * 1991-02-15 1991-05-08 Siemens AG, 8000 München Arbeitsplatzleuchte

Also Published As

Publication number Publication date
ATE728T1 (de) 1982-03-15
DK146894B (da) 1984-01-30
FI800835A (fi) 1980-10-01
FI64711C (fi) 1983-12-12
EP0017146A1 (de) 1980-10-15
ZA801879B (en) 1981-08-26
DK146894C (da) 1984-07-16
DE2912766B1 (de) 1980-09-11
FI64711B (fi) 1983-08-31
NO150576B (no) 1984-07-30
NO150576C (no) 1984-11-07
DK130980A (da) 1980-10-01
DE2912766C2 (de) 1981-11-12
NO800875L (no) 1980-10-01

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