EP1234297B1 - Panneau eclaire - Google Patents

Panneau eclaire Download PDF

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Publication number
EP1234297B1
EP1234297B1 EP00968235A EP00968235A EP1234297B1 EP 1234297 B1 EP1234297 B1 EP 1234297B1 EP 00968235 A EP00968235 A EP 00968235A EP 00968235 A EP00968235 A EP 00968235A EP 1234297 B1 EP1234297 B1 EP 1234297B1
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EP
European Patent Office
Prior art keywords
arrangement
light
disclosed
plate
grooves
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Expired - Lifetime
Application number
EP00968235A
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German (de)
English (en)
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EP1234297A1 (fr
Inventor
Jarle Rogn Jacobsen
Lars Gundersen
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compactsign AS
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Scandisign AS
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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/0409—Arrangements for homogeneous illumination of the display surface, e.g. using a layer having a non-uniform transparency

Definitions

  • the present invention relates to an illuminated sign or panel arrangement, e.g., for traffic information, advertising, other information, decoration etc.
  • None of the known arrangements referred to above provide light distribution across the light plate surface that is close to uniform.
  • European Patent Specification 495273-A1 relates to a light panel where light rays are sent in from one end edge of the panel and where transverse grooves which form a saw tooth pattern in the plate are provided. To prevent an attenuation of the light diffusion and light intensity along the length of the plate, the thickness of the plate must vary, being thickest at the light input end.
  • French Patent Specification 2732494 relates to a plate of transparent material where light is supplied to the plate from one end thereof by means of fibre optics which receive light from a common light source.
  • European Patent Specification 520368-A2 relates to a fibre optic, back-illuminated panel having additional background lighting in relation to the amount of light that is sent therethrough in devices such as rubber keys, diaphragm switches, LCDs or the like.
  • the fibre-optic panel includes a light source and a layer of optical fibres that are arranged adjacent to one another and which transmit the light therein to different points throughout the arrangement to provide increased uniform light intensity at particular points or evenly distributed light throughout the arrangement.
  • the optical fibres are selectively terminated at different points by forming holes through the layer of optical fibres using a laser, according to a predetermined geometrical pattern of scattered point stored in a computer memory.
  • a foam layer is used to disperse light in order to provide uniform illumination.
  • a major problem with the known arrangements is to be able to make them of uniform thickness whilst allowing the diffusion of light to be as uniform as possible.
  • the arrangement mentioned in the introduction is characterised, according to the invention, by at least one clear light distribution plate of a transparent plastics material, e.g., acrylic, or glass, where one side of the plate is provided with a plurality of substantially parallel grooves, and where the grooves extend wholly or partly along the length of the plate between a first and a second end thereof, at least one elongate light source device extending transverse to the parallel grooves, and a light diffuser plate or display film disposed adjacent to the other side of the light distribution plate and/or a light reflector plate or sheet placed adjacent to the first side of the light distribution plate.
  • a transparent plastics material e.g., acrylic, or glass
  • Fig. 1 shows the structure of a sign or a panel for the purpose of providing maximum uniform illumination of a text or the like that is to be displayed, wherein the text or the like may be placed on an outer plate 1 of glass or plastic that is coloured throughout or translucent.
  • Light sources in the form of luminous tubes 2, 3, e.g., cold cathode tubes are placed in semi-circular recesses 4, 5 and 6, 7 respectively in a respective plate 8, 9 of transparent material, for instance, glass or acrylic.
  • the transparent plates 8, 9 are provided with grooves which are indicated by means of the reference numerals 10 and 11 respectively. On the side facing away from the grooved face thereof, the plates 8, 9 may be wholly or partly covered by a light diffuser coating or a diffuser plate 12, 13 and 14, 15.
  • An additional translucent or coloured plate 16 of plastic or glass may be placed adjacent to the plate 9 and the diffuser coatings or plates 14, 15 so as to be capable of bearing a text or the like that is to be displayed.
  • an illuminated sign or an illuminated panel with the possibility of two-sided display is provided.
  • this embodiment also has two light distribution plates 19, 20 that are provided with respective sets of grooves 21 and 22 on one side of the plates 19, 20. As shown in Fig. 1, the two plates are positioned in such manner that the grooved sides of the plates face each other.
  • a light reflector plate or sheet 23 is expediently placed between the plates 19, 20.
  • the sheet or plate 23 may, e.g., be an opaque, preferably white, plate or a plate provided with a reflective coating.
  • a light diffusing plate or a display film, indicated in Fig. 2 by means of the reference numerals 24 and 25 respectively, can be brought to rest against the non-grooved sides of the plates 19, 20.
  • an illuminated sign or panel with the possibility of two-sided display is also obtained.
  • Fig. 3 shows a light distribution plate 26 that, in the same way as in the preceding embodiments, is provided with parallel grooves 27 on one of the sides of the plate 26. Light is introduced towards the plate 26 in the direction of the arrow 28 and/or 29. A light reflector plate or sheet 30 is placed adjacent to the grooved side of the plate 26. A light diffuser plate or display film 31 may be placed on the non-grooved side of the light distribution plate (the other side of the plate). If a light diffuser plate is used as a cover, this may optionally in addition be covered wholly or partly by a decoration, text, display film or the like (not shown in Fig. 3).
  • the grooves 35 In order to provide a best possible light distribution from a light source into the light distribution plate, where the light enters from one or both sides of the light distribution plate as indicated by means of the arrows 32, 33 in Fig. 4. where the light enters the light distribution plate 34 in the longitudinal direction of the grooves 35. it will be advantageous to allow the grooves 35 to have their termination a short distance ⁇ 1 and ⁇ 2 from respective end edges 34', 34" of the light distribution plate or the light distribution plates.
  • Fig. 5 is a schematic illustration of an illuminated sign or panel 36 where the direction of the grooves in the light distribution plate is indicated by means of the reference numeral 37.
  • a light source device 38 may be provided at one end thereof; in this connection see also Fig. 6.
  • an additional light source device 39 (indicated in broken lines in Fig. 5) may be provided at the opposite end edge of the sign or panel 36.
  • PWR indicates power supply to the light source devices 38, 39.
  • Figs. 7 and 8 show the third embodiment as indicated in Fig. 3, where the reference numeral 31 denotes a light diffuser plate, whilst the reference numeral 31' in Fig. 8 denotes a display film which typically may replace the light diffuser plate.
  • the reference numeral 31' in Fig. 8 denotes a display film which typically may replace the light diffuser plate.
  • Fig. 9 shows a light distribution plate 40 which has grooves 41 and a light diffuser plate 42.
  • the light reflector plate or sheet 30, as indicated in Figs. 3, 7 and 8, has not been included.
  • Fig. 10 shows in cross-section the embodiment in Fig. 2. It will be seen that the grooves 21 in the first light distribution plate 19 are parallel to and immediately above the grooves 22 in the second light distribution plate. By means of the modification shown in Fig. 11, the grooves 21 in the first light distribution plate 19 are parallel with but laterally offset relative to the grooves 22' in the second light distribution plate 20'.
  • the light diffuser plate which should have been placed adjacent to the plate 20' may be omitted or, e.g., replaced by a display film 25' as indicated by means of broken lines. It is also possible to replace the display film 25' with a light reflecting coating or a light reflecting plate, in order thereby to increase the light output through the plate or the film 24.
  • Fig. 12 grooves in the light distribution plate 44 are indicated by means of the reference numeral 43.
  • a plate of opal material e.g., acrylic or glass
  • the centre-to-centre distance of the grooves is indicated by dl and the thickness of the light distribution plate is indicated by d3.
  • the opal plate 45 may, e. g., be 2 mm thick, although this should by no means be seen as a limitation.
  • the opal plate may thus be thinner or thicker, or optionally be replaced by a display film.
  • the opal plate by means of its thickness helps to ensure maximum uniform light on the free surface of the opal plate 45.
  • the light which is typically scattered from a groove will have a scatter angle that is in the range of about 60-80°, preferably about 70°.
  • a scatter angle that is in the range of about 60-80°, preferably about 70°.
  • the light strikes the non-grooved side of the plate 44, it will be diffracted there. Owing to the light diffraction both in the boundary layer between the plates 44 and 45 and in the surface of the plate 45, the light intensity above the free surface of the plate 45 will emerge as almost uniform.
  • the groove mutual distance dl will vary according to the thickness of the clear, light distributing, grooved light distribution plate 44.
  • the grooves have a greatest transverse dimension (width and/or depth) in the range of 0.3-2.5 mm, preferably in the range 0.4-0.8 mm.
  • a scoring tool or a so-called "scratcher” which may have a nose radius in the range of 0.4 mm-2.5 mm, preferably 0.4 mm-0.8 mm. It may be especially favourable to increase the nose radius of the "scratcher” when the thickness d3 of the light distribution plate exceeds 10 mm.
  • a "scratcher” can be used to provide the grooves, it is possible to use, e. g., a laser or a milling tool as an alternative. In view of the fact that the greatest transverse dimension of the grooves is relatively small, the use of so-called “scratchers” is at present most preferable for producing the grooves, wherein a plurality of laterally disposed “scratchers” can be used to produce all the grooves on a plate simultaneously.
  • Figs. 13-18 show typical light distribution patterns for different types of embodiments and different types of light sources and the number thereof, and also groove distance.
  • LI denotes light intensity and L denotes the length of the sign or panel.
  • CCT and FT denote cold cathode tube and fluorescent tube respectively.
  • 1LS denotes a light source located on the left of the figure, like the light source 38 in Figs. 5 and 6, whilst 2LS denotes two light sources, like the light sources 38 and 39 in Figs. 5 and 6.
  • Figs. 17 and 18 show the use of two light sources, but make use of either a single set of grooves (SSG) having a groove distance of 9.0 mm or a double set of grooves (having a groove distance of 4.5 mm).
  • All the embodiments make use of two light distributing plates which in the chosen example have a thickness of 12 mm, and where the opal plate which is on the non-grooved side of the light distribution plate has a thickness of 2 mm.
  • the light reflecting material placed against the grooved side of the light distributing plate was, according to the test shown in Figs. 13-18, of the type 3M-Silverlux. To produce the grooves an 0.8 mm scratcher was used.
  • Fig. 13 it will be seen that the use of two light sources gives quite an even light distribution when using cold cathode tubes, whilst the use of one light source (cold cathode tube) gives a slightly decreasing light output in the direction away from the light input edge of the sign or panel.
  • the drop in light intensity is more pronounced when using fluorescent tubes, as shown in Fig. 14.
  • a double set of grooves having, e.g., a distance between them of 4.5 mm and a cut of 0.8 mm, as shown in Figs. 15 and 16, it will be seen that the light distribution for a cold cathode tube is approximately the same as for a fluorescent tube shown in Fig. 14.
  • the changes in light intensity are considerably more pronounced.
  • Fig. 17 shows a comparison of Fig. 13 and Fig. 15 when using two light source devices in the form of cold cathode tubes
  • Fig. 18 shows a comparison of Figs. 14 and 16 when using two light source devices in the form of fluorescent tubes.
  • Figs. 19, 20 and 21 indicate that the width and/or depth of the grooves may increase in the direction away from the light source device.
  • the width and/or depth of the grooves, seen in the direction from each light source device may increase until about the midway point between the light source devices.
  • the width and/or depth of the grooves does not increase linearly.
  • the width and/or depth of the grooves will be able to contribute to the increase of luminous efficacy, where this according to Figs. 13-18 is lowest.
  • the light source devices may be, e.g., cold cathode tubes, fluorescent tubes or another type of luminous tube.
  • the light source device may consist of a plurality of light-emitting diodes 46 which are placed side by side and arranged to beam in substantially the same direction, i.e., in the longitudinal direction of the grooves 47, as indicated in Fig. 22, where the light distribution plate is indicated by means of the reference numeral 48.
  • the light-emitting diodes receive power supply from a power source indicated by the letters PWR via wiring 49.
  • the heads of the light-emitting diodes 46 are arranged in a common or respective recess in the end portion of the light distribution plate 48.
  • the number of light-emitting diodes can correspond approximately to the number of grooves in the light distribution plate.
  • Fig. 23 shows another alternative solution for a light source device consisting of a plurality of light-transmitting, optical fibres 51, which are supplied from a common light source 52.
  • the optical fibres 51 have their output end arranged to beam substantially in the longitudinal direction of the grooves 53 in the light distributing plate 54.
  • the output ends of the optical fibres may either rest against the end edge of the light distribution plate or be placed in a common or respective recess 55 in the end edge portion of the light distribution plate.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Planar Illumination Modules (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Display Devices Of Pinball Game Machines (AREA)
  • Road Signs Or Road Markings (AREA)

Claims (28)

  1. Agencement d'enseigne ou de panneau lumineux, par exemple pour informations routières, publicité, autres informations, décoration etc., caractérisé par
    - au moins un panneau distributeur de lumière clair en matière plastique transparente (8, 9, 19, 20), par exemple en acrylique ou en verre, l'un des côtés du panneau étant pourvu d'une pluralité de rainures (10, 11) substantiellement parallèles, et les rainures s'étendant entièrement ou partiellement sur la longueur du panneau entre une première et une deuxième extrémité de celui-ci;
    - au moins un dispositif source de lumière (2, 3) allongé qui s'étend transversalement aux rainures parallèles; et
    - un panneau diffuseur (12, 13, 14, 15) ou film pour enseigne lumineuse positionné adjacent à l'autre côté du panneau distributeur de lumière et/ou un panneau réflecteur
    ou une feuille réflectrice (23) posé(e) sur le premier côté du panneau distributeur de lumière.
  2. Agencement selon la revendication 1, caractérisé par
    - un premier et un deuxième panneau distributeur de lumière, les côtés rainurés des panneaux étant posés l'un sur l'autre.
  3. Agencement selon la revendication 2, caractérisé en ce
    - qu'un panneau réflecteur ou une feuille réflectrice est placée entre les deux panneaux distributeurs de lumière.
  4. Agencement selon la revendication 2 ou 3, caractérisé en ce
    - qu'un panneau diffuseur ou un film pour enseigne lumineuse est placé adjacent au côté non rainuré d'au moins un des panneaux distributeurs de lumière.
  5. Agencement selon l'une ou plusieurs des revendications précédentes 2-4, caractérisé en ce
    - que les panneaux distributeurs de lumière présentent sur le côté rainuré au moins un évidement de réception d'un dispositif source de lumière qui s'étend transversalement aux rainures, de sorte que lorsque les côtés rainurés des plaques reposent l'un sur l'autre, des évidements opposés forment un emplacement pour le dispositif source de lumière.
  6. Agencement selon l'une ou plusieurs des revendications 1-5, caractérisé en ce
    - que le panneau diffuseur couvre entièrement ou partiellement le panneau distributeur de lumière non rainuré.
  7. Agencement selon l'une ou plusieurs des revendications 1-6, caractérisé en ce
    - que le panneau diffuseur est recouvert d'un panneau opale.
  8. Agencement selon l'une ou plusieurs des revendications précédentes, caractérisé en ce
    - que les rainures se terminent à une courte distance des bords respectifs du/des panneau(x) distributeur(s) de lumière.
  9. Agencement selon les revendications 1-4 ou 6-8, caractérisé en ce
    - qu'un dispositif source de lumière est pourvu à l'un des bords d'extrémité du/des panneau(x) distributeur(s) de lumière.
  10. Agencement selon les revendications 1-4 ou 6-8, caractérisé en ce
    - qu'un dispositif source de lumière respectif est pourvu à chacun des deux bords d'extrémité opposés du/des panneau(x) distributeur(s) de lumière.
  11. Agencement selon l'une ou plusieurs des revendications précédentes, caractérisé en ce
    - que la largeur et/ou la profondeur des rainures augmente en s'éloignant du dispositif source de lumière.
  12. Agencement selon l'une ou plusieurs des revendications précédentes où deux dispositifs source de lumière sont utilisés, caractérisé en ce
    - que la largeur et/ou la profondeur des rainures, vues depuis chacun des dispositifs source de lumière, augmente jusqu'au point central environ entre les dispositifs source de lumière.
  13. Agencement selon la revendication 12, caractérisé en ce
    - que la largeur et/ou la profondeur des rainures augmente de manière non linéaire.
  14. Agencement selon la revendication 2, caractérisé en ce
    - que les rainures dans le premier panneau distributeur de lumière sont parallèles et immédiatement superposées aux rainures dans le deuxième panneau distributeur de lumière.
  15. Agencement selon la revendication 2, caractérisé en ce
    - que les rainures dans le premier panneau distributeur de lumière sont parallèles aux rainures dans le deuxième panneau distributeur de lumière mais latéralement décalées par rapport à celles-ci.
  16. Agencement selon l'une quelconque des revendications précédentes, caractérisé en ce
    - que le dispositif source de lumière est un tube à cathode froide.
  17. Agencement selon l'une quelconque des revendications précédentes, caractérisé en ce
    - que le dispositif source de lumière est un tube fluorescent.
  18. Agencement selon l'une quelconque des revendications précédentes 1-4 et 6-17, caractérisé en ce
    - que le dispositif source de lumière est constitué d'une pluralité de diodes électroluminescentes placées côté à côté et agencées de sorte à rayonner dans la même direction substantiellement, c'est-à-dire dans la direction longitudinale des rainures.
  19. Agencement selon la revendication 18, caractérisé en ce
    - que les têtes des diodes électroluminescentes sont placées dans un évidement dans le bord d'extrémité du panneau distributeur de lumière.
  20. Agencement selon les revendications 18 et 19, caractérisé en ce
    - que le nombre de diodes électroluminescentes correspond approximativement au nombre de rainures dans le panneau distributeur de lumière.
  21. Agencement selon l'une ou plusieurs des revendications 1-4 et 6-17, caractérisé en ce
    - que le dispositif source de lumière est constitué d'une source de lumière unique qui alimente une pluralité de fibres optiques qui à leur extrémité de sortie ont une direction de rayonnement substantiellement dans la direction longitudinale des rainures.
  22. Agencement selon la revendication 21, caractérisé en ce
    - que les extrémités de sortie des fibres optiques reposent sur le bord d'extrémité du panneau distributeur de lumière.
  23. Agencement selon la revendication 21, caractérisé en ce
    - que les extrémités de sortie des fibres optiques sont placées dans un évidement dans la partie au bord d'extrémité du panneau distributeur de lumière.
  24. Agencement selon l'une ou plusieurs des revendications précédentes, caractérisé en ce
    - que la distance entre les rainures dans le panneau distributeur de lumière est fonction de l'épaisseur du panneau, où d 1 = d 2 + k *  d 3 ,
    Figure imgb0002
    où d1 est l'écart entre les rainures, d2 est un écart minimum fixe entre les rainures, d3 est l'épaisseur du panneau distributeur de lumière et k est une constante.
  25. Agencement selon la revendication 24, caractérisé en ce
    - que k = 0,625 et d2 est 1,5 mm.
  26. Agencement selon l'une ou plusieurs des revendications précédentes, caractérisé en ce
    - que les rainures ont une dimension transversale maximale dans la plage de 0,3-2,5 mm, de préférence dans le plage de 0,4-0,8 mm.
  27. Agencement selon la revendication 24, caractérisé en ce
    - que d1 est 4,5 mm ou 9,0 mm.
  28. Agencement selon l'une ou plusieurs des revendications précédentes, caractérisé en ce
    - que l'épaisseur du panneau opale est 2 mm.
EP00968235A 1999-10-05 2000-10-04 Panneau eclaire Expired - Lifetime EP1234297B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NO994846 1999-10-05
NO19994846A NO313256B1 (no) 1999-10-05 1999-10-05 Anordning ved opplyst skilt eller tavle
PCT/NO2000/000327 WO2001026080A1 (fr) 1999-10-05 2000-10-04 Panneau eclaire

Publications (2)

Publication Number Publication Date
EP1234297A1 EP1234297A1 (fr) 2002-08-28
EP1234297B1 true EP1234297B1 (fr) 2006-06-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP00968235A Expired - Lifetime EP1234297B1 (fr) 1999-10-05 2000-10-04 Panneau eclaire

Country Status (8)

Country Link
EP (1) EP1234297B1 (fr)
AT (1) ATE330305T1 (fr)
AU (1) AU7818000A (fr)
DE (1) DE60028812T2 (fr)
DK (1) DK1234297T3 (fr)
ES (1) ES2265987T3 (fr)
NO (1) NO313256B1 (fr)
WO (1) WO2001026080A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6834987B2 (en) 2002-11-15 2004-12-28 Dennis R. Zynda Illuminated medallion for transmission shifter knobs
US6895705B2 (en) 2003-05-15 2005-05-24 Marketing Display, Inc. Light panel
GB2464915A (en) * 2008-09-23 2010-05-05 Egush Ltd Lighting device
DE102009011948A1 (de) * 2009-03-10 2010-09-16 GM Global Technology Operations, Inc., Detroit Anzeigevorrichtung für ein Fahrzeug und Verfahren zur Herstellung der Anzeigevorrichtung
EP2437242A1 (fr) * 2010-09-29 2012-04-04 Koninklijke Philips Electronics N.V. Dispositif d'éclairage
CH709635B1 (de) * 2014-05-21 2019-03-15 Ackutech AG Leuchtrahmen.
WO2020083647A1 (fr) * 2018-10-25 2020-04-30 Signify Holding B.V. Panneau de del utilisant des filaments de del pour fournir un éclairage efficace et homogène

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2194311C2 (ru) * 1991-10-01 2002-12-10 Артлайт Корпорейшн Лимитед Пластина знака (варианты) и способ ее изготовления
GB2281142A (en) * 1993-08-05 1995-02-22 Sean Robert Beech Illuminated display arrangements
AU2130997A (en) * 1997-02-21 1998-09-09 Fiber Does, Inc. Fiber-optic signs
WO1999000625A1 (fr) * 1997-06-26 1999-01-07 Bogstavhuset A/S Enseigne lumineuse electrique
FR2776811B1 (fr) * 1998-03-25 2001-12-14 Christophe Blanc Dispositif lumineux eclaire par la tranche

Also Published As

Publication number Publication date
ES2265987T3 (es) 2007-03-01
DK1234297T3 (da) 2006-10-23
DE60028812T2 (de) 2007-01-04
WO2001026080A1 (fr) 2001-04-12
NO994846L (no) 2001-04-06
AU7818000A (en) 2001-05-10
NO313256B1 (no) 2002-09-02
NO994846D0 (no) 1999-10-05
ATE330305T1 (de) 2006-07-15
DE60028812D1 (de) 2006-07-27
EP1234297A1 (fr) 2002-08-28

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