EP0388643B1 - Leuchtsymbolkörper - Google Patents

Leuchtsymbolkörper Download PDF

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Publication number
EP0388643B1
EP0388643B1 EP90103237A EP90103237A EP0388643B1 EP 0388643 B1 EP0388643 B1 EP 0388643B1 EP 90103237 A EP90103237 A EP 90103237A EP 90103237 A EP90103237 A EP 90103237A EP 0388643 B1 EP0388643 B1 EP 0388643B1
Authority
EP
European Patent Office
Prior art keywords
panel
element according
housing
symbol element
illuminated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90103237A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0388643A2 (de
EP0388643A3 (de
Inventor
Dieter Härter
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0388643A2 publication Critical patent/EP0388643A2/de
Publication of EP0388643A3 publication Critical patent/EP0388643A3/de
Application granted granted Critical
Publication of EP0388643B1 publication Critical patent/EP0388643B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G09F13/0404—Signs, boards or panels, illuminated from behind the insignia the light source being enclosed in a box forming the character of the sign

Definitions

  • the present invention relates to a luminous symbol body, in particular for outdoor advertising lettering.
  • outdoor advertising lettering which consist of letter casings, which are designed to be opaque and whose light sources integrated in the casing emit light to the rear.
  • the wall is illuminated, so that the letters emerge darkly from the brightly illuminated wall surface to which they are attached.
  • the present invention has for its object to improve indirectly illuminated luminous symbol bodies of the type described above in such a way that a uniformly bright background is always created in the area of the symbol contours, regardless of the place of attachment, so that a uniform appearance can be achieved regardless of the background of the external advertising lettering.
  • Preferred embodiments of the luminous symbol body according to the invention according to claim 1 are characterized in the subclaims.
  • the luminous symbol body according to the invention is based on the principle of closing the back of the symbol with a transparent plate which protrudes by a certain amount at the symbol peripheral edges and in particular to design this plate at its edges so that light emerging from the plate is emitted forward to the viewer of the illuminated lettering without that another backscattering background would be required.
  • FIGS. 1 to 4 represents, as a simple exemplary embodiment, a cuboid body which can be used as "I" or as a hyphen in a light lettering.
  • Figure 1 shows a light source (1), which is housed for the most part in a housing (3) which, seen in section, consists of 3 walls, 2 side walls and a bottom, which are glued together.
  • the housing forms the symbol body, e.g. a letter.
  • the housing walls are made of acrylic glass, which is lacquered white light-proof on the inside. Of course, housings made of metal or other materials can also be used, and light-tightness may also not be necessary in certain areas to achieve certain effects.
  • the housing base can be flat as shown, but it can also have any desired shape, e.g. have a roof shape or other profiles.
  • the housing (3) is closed by a plate (2), into which a channel (4) is incorporated, which receives part of the light source (1).
  • a shoulder (9) of the plate (2) protrudes into the interior of the housing (3), which ends in a form-fitting manner on the edge of the housing (3) with the inside of the side walls of the housing (3).
  • the plate (2) and the housing (3) are fastened to one another using countersunk screws (12).
  • the shoulders can be molded in one piece from the plate (2), they can also be attached later as glued-on tongues.
  • FIG. 1 It can be seen in FIG. 1 that the areas of the plate (2) projecting beyond the side walls of the housing (3) are chamfered at an angle of 45 ° with respect to the plate surface.
  • a variant is shown on the left, in which the lower edge is also bevelled by 45 °.
  • the aim of this bevel is to allow light propagating in the plate to emerge from the plate body at certain angles in the direction of the viewer of the illuminated lettering, so that an optimum of light intensity can clearly show the contour of the symbol body.
  • the plate (2) is made of clear acrylic glass, but there are also other materials, such as Quartz glass or the like is conceivable.
  • Figure 2 shows the symbol body of Figure 1 from the side, partially cut longitudinally.
  • the light source used in FIG. 1 is a fluorescent tube, which is bent at its ends into the inside of the housing in a U-shape, so that the part of the fluorescent tube containing the fluorescent substance can be guided up to close to the upper edge of the housing.
  • the electrode of the fluorescent tube is covered by an electrode cover which is fastened to the plate 2 and which can be designed in the form of a grid, e.g. in the form of a perforated plate, protected from external influences. Furthermore, glass holder pins are provided for holding the tube - likewise not shown - which engage in bores on both sides of the groove and span part of the tube.
  • the acrylic glass plate (2) shows the edge grinding provided in Figure 1 on the left edge.
  • Figure 3 shows the light symbol body partially cut in plan view.
  • the channel (4) is milled into the plate (2) and follows the contours of the fluorescent tube (1) with essentially constant play.
  • openings (14) are provided in the interior of the housing for the power supply for the fluorescent tube (1).
  • FIGS. 4a-h show various shaping options for the edge regions of the plate (2) which project beyond the side walls of the housing (3).
  • Figure 4a shows the simplest case in which the plate (2) is only cut perpendicular to the main surfaces of the plate, a constant protrusion being maintained relative to the side walls of the housing (3).
  • the light emitted by the light source (1) enters the transparent plate (2) on the side walls of the channel (4) by refraction of the beam path, where a large part of the light is reflected on the rear side (15) of the plate (2) .
  • the reflected light occurs partly on the parallel to the side walls of the housing (3) Cut surfaces of the plate and partly in the area of the peripheral edge (5) of the plate (2) with renewed refraction.
  • the variant shown in Figure 4b has a groove (8) in the region of the peripheral edge of the plate (2), which has the effect that the light emerging in the direction of the viewer is guided more along the side surfaces of the housing (3).
  • a coating of highly reflective material is attached to the rear (15) of the plate (2) to increase the reflection.
  • This can be a foil made of aluminum or also a highly reflective layer made of aluminum, silver or the like which is attached by chemical means or by evaporation.
  • Figure 4d also shows 2 variants in which the back of the plate is either concave or convex.
  • the concave curvature shown in the left half causes a further fanning out of the light directed towards the front, whereas the convex bottom shape on the right side tends to concentrate the light thrown forward.
  • Figures 4 e and f have roundings (7) in the peripheral edge regions of the plate (2), which can be attached either to the upper and to the lower edge or only to the upper edge.
  • This edge design in the form of cylindrical lenses also results in a specific beam guidance, which leads here to the fact that the light coupled into the plate (2) is perceived by the viewer as a clearly delimited narrow light strip which surrounds the silhouette of the symbol body.
  • 4g shows a plate 2 with a trapezoidal cross section, the longest edge describing the surface facing the housing 3.
  • the angle of inclination ⁇ of the peripheral edge with respect to the above-mentioned surface is 60 °. With the plastic material used, this value results in very favorable light beam guidance approximately parallel to the housing side walls towards the viewer. In certain applications, other angles of inclination may also be considered. For example, a smaller angle of inclination at the lower edge of symbols is advantageous if the symbol bodies are arranged far above the eye level of viewers in order to cause light reflection obliquely downwards.
  • Channel 4 is milled here with partly sloping side walls. The slightly roughened surface created by milling is advantageous for coupling light from the tube into the plastic material and is therefore left unchanged.
  • the light coupled into the plastic material from the tube is reflected at the peripheral edge. Most rays hit the inclined edge surface at an angle greater than or equal to the angle of total reflection. This results in an optimal radiation of the light rays towards the viewer, whereby the contours of the luminous symbol body come out sharply.
  • the channel 4 is widened at its ends, in particular in the case of very slim symbol bodies, for example the letters "I”, “H”, “N” etc., transversely to its longitudinal extent towards the edges of the symbol body.
  • This expansion can be essentially triangular in plan view, with the base parallel to the narrow end of a symbol body. It may also be sufficient to mill a narrow groove that "T" -shaped end of channel.
  • the rough milled channel walls diffuse the light from the light source evenly onto the inclined edge surfaces of the symbol body at the channel ends, so that there is approximately a uniform light distribution around the symbol body.
  • Fig. 4h shows a wider symbol body, in the plate two channels are incorporated for receiving fluorescent tubes. This ensures that the distance between the fluorescent tube and the edge to be illuminated by it is not too great. On the other hand, a uniform illumination of the base is ensured in the case of symbol bodies with an at least partially transparent housing base.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
EP90103237A 1989-03-23 1990-02-20 Leuchtsymbolkörper Expired - Lifetime EP0388643B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8903700U DE8903700U1 (de) 1989-03-23 1989-03-23 Leuchtsymbolkörper
DE8903700U 1989-03-23

Publications (3)

Publication Number Publication Date
EP0388643A2 EP0388643A2 (de) 1990-09-26
EP0388643A3 EP0388643A3 (de) 1991-04-03
EP0388643B1 true EP0388643B1 (de) 1992-05-20

Family

ID=6837511

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90103237A Expired - Lifetime EP0388643B1 (de) 1989-03-23 1990-02-20 Leuchtsymbolkörper

Country Status (6)

Country Link
EP (1) EP0388643B1 (enrdf_load_stackoverflow)
AT (1) ATE76525T1 (enrdf_load_stackoverflow)
DE (2) DE8903700U1 (enrdf_load_stackoverflow)
DK (1) DK0388643T3 (enrdf_load_stackoverflow)
ES (1) ES2031714T3 (enrdf_load_stackoverflow)
GR (1) GR3004705T3 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8903700U1 (de) * 1989-03-23 1989-05-11 Härter, Dieter, 81545 München Leuchtsymbolkörper
DE9308782U1 (de) * 1993-06-09 1993-08-19 Fischer, Florian, 10967 Berlin Leuchtelement, insbesondere für Informations- und Werbezwecke

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1204372A (en) * 1967-03-23 1970-09-09 Hawesigns Ltd Improvements in electrically illuminated display signs
US3507065A (en) * 1967-12-21 1970-04-21 Technical Ordnance Inc Overlay for illuminating tubing
DE8903700U1 (de) * 1989-03-23 1989-05-11 Härter, Dieter, 81545 München Leuchtsymbolkörper

Also Published As

Publication number Publication date
GR3004705T3 (enrdf_load_stackoverflow) 1993-04-28
EP0388643A2 (de) 1990-09-26
DE8903700U1 (de) 1989-05-11
DE59000128D1 (de) 1992-06-25
ES2031714T3 (es) 1992-12-16
DK0388643T3 (da) 1992-07-13
EP0388643A3 (de) 1991-04-03
ATE76525T1 (de) 1992-06-15

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