EP0812404B1 - Streuscheibe für signalleuchte mit phantombildung vermeidender wirkung - Google Patents

Streuscheibe für signalleuchte mit phantombildung vermeidender wirkung Download PDF

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Publication number
EP0812404B1
EP0812404B1 EP96904900A EP96904900A EP0812404B1 EP 0812404 B1 EP0812404 B1 EP 0812404B1 EP 96904900 A EP96904900 A EP 96904900A EP 96904900 A EP96904900 A EP 96904900A EP 0812404 B1 EP0812404 B1 EP 0812404B1
Authority
EP
European Patent Office
Prior art keywords
lens
prism
segments
plane
prism segments
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
EP96904900A
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English (en)
French (fr)
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EP0812404A1 (de
Inventor
Jacques Sabater
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.)
Sagem SA
Original Assignee
Sagem SA
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 Sagem SA filed Critical Sagem SA
Publication of EP0812404A1 publication Critical patent/EP0812404A1/de
Application granted granted Critical
Publication of EP0812404B1 publication Critical patent/EP0812404B1/de
Anticipated expiration legal-status Critical
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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
    • F21S8/00—Lighting devices intended for fixed installation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2111/00—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
    • F21W2111/02—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00 for roads, paths or the like

Definitions

  • the present invention relates to a lens for anti ghost signaling light.
  • a lens for signaling light having a convex external surface and a concave internal surface having reliefs, this lens comprising a peripheral part comprising light deflection organs according to at least one direction strongly inclined with respect to a tangent plane to the outer surface of the lens.
  • the lens is associated with a parabolic reflector, the peripheral part has an internal radius equal to about twice the focal length of the reflector.
  • the deflection organs are prisms.
  • the lens according to the invention which is carried out in a manner known per se under shape of a circular disc made of a transparent material such than polycarbonate, has a shaped outer surface smooth convex spherical cap illustrated on Figures 2 to 4 with a vertical plane P tangent to the surface outer lens in the center of the lens.
  • the internal surface of the lens has several series of curved surface prism segments having generators that extend in vertical planes.
  • the prism segments of each series are the same to others and in the illustrated embodiment the lens has three sets of prism segments to curvilinear surface.
  • prism segments of the first series bear the reference numeral 1 in the figures, according to a section through a vertical plane as illustrated in FIG. 2, prism segments 1 have curvilinear generators which each have a profile identical to the profile of the surface outer of the lens. As illustrated in Figure 5, the prism segments 1 have, in a section through a plane horizontal, an arcuate outline so that the prism segments 1 are in the form of beads having a vertical longitudinal direction. As example, the prism segments 1 of the embodiment illustrated have a width of 5 mm and a radius of curvature in the horizontal plane of 5 mm.
  • the prism segments 2 of the second series have a cylindrical surface obtained by a generator rectilinear inclined with respect to the plane P (FIG. 3) and based on a basic curve in an arc of a circle (figure 5).
  • the segments of prism 2 have straight generators inclined at 6.5 ° with respect to the vertical plane P, a width of 5 mm, a 10 mm high, and a basic curve with a radius of 9 mm.
  • the prism segments 2 are more or less protruding depending on the degree local inclination of the outer surface of the lens with respect to plane P.
  • the prism segments arranged at the top of the lens are more strongly protruding than those arranged in the bottom of the lens.
  • the prism segments 3 of the third series are also prism segments with a cylindrical surface but have a more strongly inclined straight generator that the generatrices of the prism segments 2 relative in the vertical plane P.
  • the generatrices of the prism segments 3 form an angle 13 ° with the vertical plane P, they have a width of 5mm, a height of 5 mm and a basic curve having a radius of 9 mm.
  • the cylindrical prism segments have preferably a height inversely proportional to the inclination of the generators with respect to the vertical plane P.
  • the prism segments 2 and 3 all have their curvilinear surface oriented upwards to ensure a deviation towards the bottom of the rays reflected by the light reflector of signaling and are evenly distributed over the lens surface.
  • the segments of prism 1 are made continuously over the entire height of the middle part of the lens and the segments of prism 2 and 3 are made in vertical rows alternating with prism segments 1. So that the light is distributed evenly taking into account the lower height of the prism segments 3, these are joined in pairs to make a segment with a height equal to the height of a prism segment 2.
  • the lens according to the invention designated by the reference 100 is intended to be associated with a parabolic reflector 101 in which is mounted a bulb 102 disposed at the focus of the parabolic reflector 101, that is to say say at a focal distance f from the top of the parabolic reflector.
  • the lens comprises a peripheral part comprising elements for deflecting the light in an orientation which is strongly inclined relative to the plane P tangent to the external surface of the lens in order to reduce the ghost effect resulting from light coming from the outside of the lens and not from the inside of the traffic light.
  • the deflection members are prisms 4 having a flat face turned upwards of the lens and inclined at an angle of 40 ° relative to the plane P.
  • the prisms 4 whose edge is horizontal extend next to each other all around the middle part comprising the prism segments 1, 2 and 3.
  • the peripheral part must have an internal radius R approximately equal to twice the focal distance f .
  • a lens according to the invention with a diameter of 200 mm associated with a parabolic deflector having a focal length of 35 mm will include a peripheral part having an internal diameter of 140 mm.
  • the rays normally deflected by the lens are those which are emitted by the bulb 102 and are reflected on the reflector 101 to be returned by it to through the lens.
  • the socket which supports the bulb 102 creates a central cone in which there is no reflection on the reflector 101 so that the rays that reach the central part of the lens 100 are those that come directly from bulb 102.
  • the lens preferably has in its central part of the flat surface prism segments with orientations varied with respect to the tangent plane P at the external surface of the lens.
  • the part central has a central square 10 having a side of 10 mm whose internal surface is flat and extends parallel in plane P.
  • lens 10 Adjacent to the upper side and to the lower side of square 10, lens 10 has rectangular prism segments 8 having a surface internal plane facing upward for the segment of prism 8 which is above the horizontal diameter of the lens, and down to the prism segment 8 located below the horizontal diameter of the lens.
  • the prism segments 8 are inclined at an angle of 10 ° to the vertical plane P.
  • the lens Adjacent to the lateral sides of the square central 10, the lens has prism segments 7 having a vertical internal surface facing the periphery of the lens. In the embodiment illustrated, the internal face of the prism segments 7 makes a angle of 10 ° with the vertical plane P.
  • the lens has square prism segments 9.
  • the prism segments 9 have all an internal surface facing laterally towards the periphery of the lens at an inclination of 10 ° by relative to plane P.
  • the prism segments 9 arranged above of the horizontal diameter of the lens are further turned upward at an angle of 10 ° by in relation to plane P and the prism segments 9 arranged below of the horizontal diameter of the lens are rotated downward at an angle of 10 ° to the plan P.
  • the lens Adjacent to the prism segments 8 and to the prism segments 9 which are attached to them the lens has prism segments 6 facing laterally the periphery of the lens at an angle of 6 ° with respect to the plane P.
  • the prism segments 6 arranged above the horizontal diameter of the lens are turned upwards at an angle of 10 ° by in relation to plane P and the prism segments 6 arranged below of the horizontal diameter of the lens are rotated downward at an angle of 10 ° to the plan P.
  • the lens Adjacent to the prism segments 7 and to the prism segments 9 which are attached to them, the lens has prism segments 5 having a flat internal surface turned laterally towards the periphery of the lens at an inclination of 16 ° relative to in plane P.
  • the prism segments 5 arranged above of the horizontal diameter of the lens are rotated upwards at an angle of 6 ° to the plane P while the prism segments 5 arranged below of the diameter of the lens, are turned towards the down at an angle of 6 ° to the plane P.
  • the bulb is preferably mounted so that the filament either positioned at about 45 ° to a direction longitudinal rows of prism segments of the middle part of the lens.
  • the deflection organs of light 4 of the peripheral part have been illustrated by prisms all presenting a horizontal generator, we can provide prisms with orientations different or different deviating bodies of prisms, for example spherical reliefs or a frosted surface which strongly deflect light according to a multitude of directions.
  • a peripheral part according to the invention can be associated with a middle part comprising so conventional interlocking ribs or reliefs of a different nature.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Traffic Control Systems (AREA)
  • Optical Head (AREA)
  • Lenses (AREA)

Claims (2)

  1. Linse für eine Signalleuchte mit einer konvexen Außenfläche und einer konkaven Innenfläche, die ein Relief hat, wobei der Umfangsabschnitt Ablenkelemente (4) für das Licht in mindestens eine Richtung hat, die gegenüber einer zur Außenfläche tangentialen Ebene (P) stark geneigt ist, dadurch gekennzeichnet, daß sie mit einem parabolischen Reflektor (101) verbunden ist und daß der Innenradius (R) des Umfangsabschnitts ungefähr gleich dem zweifachen der Brennweite (F) des parabolischen Reflektors ist.
  2. Linse nach Anspruch 1, dadurch gekennzeichnet, daß der Umfangsabschnitt Prismensegmente (4) mit geradlinigen Erzeugenden umfaßt.
EP96904900A 1995-02-24 1996-02-23 Streuscheibe für signalleuchte mit phantombildung vermeidender wirkung Expired - Lifetime EP0812404B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9502179 1995-02-24
FR9502179A FR2731062B1 (fr) 1995-02-24 1995-02-24 Lentille pour feu de signalisation a effet anti-fantome
PCT/FR1996/000288 WO1996026390A1 (fr) 1995-02-24 1996-02-23 Lentille pour feu de signalisation a effet anti-fantome

Publications (2)

Publication Number Publication Date
EP0812404A1 EP0812404A1 (de) 1997-12-17
EP0812404B1 true EP0812404B1 (de) 1998-08-05

Family

ID=9476478

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96904900A Expired - Lifetime EP0812404B1 (de) 1995-02-24 1996-02-23 Streuscheibe für signalleuchte mit phantombildung vermeidender wirkung

Country Status (6)

Country Link
EP (1) EP0812404B1 (de)
AT (1) ATE169391T1 (de)
DE (1) DE69600493T2 (de)
ES (1) ES2121478T3 (de)
FR (1) FR2731062B1 (de)
WO (1) WO1996026390A1 (de)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB307482A (en) * 1928-03-10 1929-12-10 Westinghouse Brake & Signal Improvements relating to light signals

Also Published As

Publication number Publication date
EP0812404A1 (de) 1997-12-17
ATE169391T1 (de) 1998-08-15
ES2121478T3 (es) 1998-11-16
WO1996026390A1 (fr) 1996-08-29
DE69600493T2 (de) 1999-02-11
DE69600493D1 (de) 1998-09-10
FR2731062A1 (fr) 1996-08-30
FR2731062B1 (fr) 1997-04-04

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