FR2501336A1 - LIGHT EMISSION ASSEMBLY FOR MOTOR VEHICLES - Google Patents

Abstract

THE INVENTION CONCERNS A LIGHT EMISSION ASSEMBLY, IN PARTICULAR MOTOR VEHICLE SIGNALING LIGHT, OF THE TYPE INCLUDING A LIGHT SOURCE 10 AND REFLECTORS OR DIOPTRIC MEANS COOPERATING WITH THE SOURCE TO EMIT A LIGHT BEAM. IT IS CHARACTERIZED IN THAT IT CONTAINS AT LEAST A 100 SERIES OF DOUBLE-REFLECTING PARALLEL FLAT SLATS 110 ARRANGED ON THE OUTPUT PATH OF THE LIGHT RAYS, SO AS TO LEAVE ALL OF THE RAYS RETURNED BY THE REFLECTING MEANS, OF MASK AGAINST THE PENETRATION OF MOST AMBIENT LIGHT RAYS DA COMING FROM THE EXTERIOR. THE EXTERIOR COLOR OF THE EXTINGUISHED LIGHT IS NEUTRAL.

Description

250133-6

  The present invention relates to light emitting assemblies for motor vehicles, in particular, but not exclusively,

  the traffic lights of color.

  Such lights conventionally co-ordinate a light source, generally transmitting white light, and cooperating with

  reflecting means, most often made up of at least one

  parabolic mirror, the focus of which is substantially in agreement with the source and sending back light rays substantially parallel to

  a main directorate of emission. To obtain the desired color

  light, a wall is interposed on the path of light

  colored translucent, which may consist either of a balloon

  lore surrounding the lamp, either by a colored globe constituting the face

frontal fire.

  Such sets give complete satisfaction to the emission, that is to say when their lamp is lit: they emit, in the desired field, a light having a specific color and intensity. However, by their mime construction, they have the disadvantage of showing the external observer their color

  own and / or their internal constitution.

  This is mainly due to the fact that the ambient rays coming from any direction are generally free to penetrate inside the fire, to be reflected twice by the reflector means, and finally to emerge from the fire which returns to the light. 'before a significant part of the luminous flux

ambient that hits him.

  The ambient light rays thus returned naturally take

  the color of the walls they pass through, while at the same time

  picture the objects they encounter; that's why the fires of

  signaling appear colored for the external observer.

  laughing. The same is true for certain projectors equipped with a

  yellow lamp that show up outside, when extinguished

  projector, the yellow coloring.

  Such a colored appearance is a major drawback

  aesthetically. On the contrary, it appears extremely

  It is desirable for stylists to have light emitting assemblies for vehicles -2 which are automaDbile, whose appearance is completely neutral (bright white) when they are extinguished. Such sets, indeed, are likely to harmonize much better

  than existing sets with all body colors.

  The present invention aims at producing such assemblies, and proposes for this purpose a new optical structure, thanks to which the signaling effect mentioned above is practically avoided for most directions of incident light, and in particular

  for ambient rays coming from above.

  The novel light emitting assembly according to the invention comprises, in the traditional way, a light source and reflective or dioptric means for cooperating with

  it and send forward light rays according to a direc-

  (or around such a principal direction)

the).

  The coloration may be given to the light rays either by constituting the source by a bulb incorporating the color, or by surrounding the light source of a colored balloon, or by interposing, in front of the light source, a colored translucent wall. Alternatively, we can cover the reflective surface

  reflective means by a colored varnish, or color the dioptric toyens.

  The essential means of the invention is constituted by

  less a series of parallel plane blades doubly reflective

  are arranged in the path of light rays. These la-

  They leave, after a double reflection on a pair of blades, each of the rays reflected by the reflector. On the contrary, for ambient light, they serve as a mask for most anmbiant rays, except for those which have a direction of incidence substantially parallel to the main direction of exit, for

  which is referred in the direction of incidence.

  But these latter rays represent only a small proportion of the ambient light flux likely to penetrate into the emission assembly according to the invention, especially since, in practice, ambient light, for example solar light, introduced to

  the whole coming from the top with a marked inclination.

  - 3- To play their role better, the blades, nomin in the upper part of the set, are arranged with an obliquity

  which goes from top to bottom and back to front.

  Alternatively, the blades may have this arrangement in the upper half of the device, and amoir the reverse arrangement (that is to say, be oblique from bottom to top and from back to front)

  in the lower part of the church.

  The dimensions, the relative spacing, and the obliquity of the blades may be variable. In general, for an optimal effect, it is necessary and sufficient that they project on a plane perpendicular to the main direction of exit without notable discontinuity, but

also without much notice.

  Discontinuity, indeed, attenuate the effect of nmasque, against the ambient rays. On the other hand, overlap

  could achieve an oocltation screen effect on the xayons bhis.

  According to another characteristic of the invention, the coloring

  Instead of being made by conventional means, or by a translucent inner wall, it can be incorporated directly into the slides which are then translucent colored slides.

  having a surface that is reflective, for example <

  full of colored glass slides, one side of which receives an aluminage).

  When all blades have the same inclination,

  it is advantageous to use in the axis of the device a

  direct light between the light source and the

ble of the blade according to the invention.

  Other cractritiues and advantages of the invention

  will appear in the following description with reference to

in the accompanying drawings in which:

  - Figure 1 r - presents in vertical axial section a

  emission semtble according to the invention; FIG. 1a shows, in detail, an alternative embodiment of the blades;

  - Figure 2 very schematically shows in section -

  axial vertical a variant of implantation of the blades.

- 4-

  The light emission assembly according to the invention represents

  1, in a preferred example, coeporte a lamp 10, the rear of which is disposed a reflector 20, of which

the surface 21 is reflective.

  The filament 11 of the lamp is substantially at the focus of the reflector 20 which has a reflective surface 21 in the form of a paraboloid of revolution AA axis, this axis constituting the optical axis

  of the system. As can be seen in the figure, the R-rays coming from the

  lament 11 are returned by the reflector 20 parallel to the axis AA which thus constitutes the main direction of exit. At the front of the lamp 10, there is a direct light shield 30, which can, as shown, be a substantially plane screen perpendicular to the axis A ^. The reflector 20 is extended by cheeks 50 so

  to form a shoemaker that houses all the elements of the whole.

  This box is closed by a globe 60 which, typically, is translucent, without particular coloration. The globe 60 may coort, in a manner known in itself, diffusion streaks, 61, which

  only partially shown in the figure.

  the desired coloration is given to the rays R returned by the reflector 20 with the aid of a colored translucent wall 70 which,

  in the example shown is perpendicular to the axis AM. -

  The essential element of the device is constituted by a series 100 of blades 110 which are parallel to each other and which are doubly reflective, in that their two flat faces

  parallels 11Oa and 11Ob both behave like

  roirs. The blades 110 are arranged obliquely from top to bottom and

  the rear forward with respect to the main direction AM.

  They serve to reflect the rays that strike them on one or

  the other of their faces 11Oa or 11Ob.

  In the example shown, it is the faces 110a and 110b themselves which are represented as being mirrors; in other words, the blades are reflective on all their outer surfaces and the light rays never enter the blades. As will be seen later, other constructions are possible and

are part of the invention.

  As can be seen in the figure, the arrangement of the blades 110 is such that each of the spokes R, after passing through the colored screen 70

  is doubly reflected on a pair of blades and finally comes out-

  of the transmission set according to the RU direction substantially

  goes to the main direction mA. Thus, almost all of the rays emitted by the filament 11 and returned by the reflector 20 finally come out of the assembly, the dimension, the obliquity and the spacing of the blades being such that any ray that reaches all the blades 110 passing between two blades

  adjacent to the device after only two reflections. At the

  mission, only the luminous flux corresponding to the striking rays

  the slice of the blades (in themselves very thin) is lost.

  On the contrary, in which the ambient rays, which occur for example with an incident direction DA coming from a point in the sky, the assembly 100 co-carries a mask. For most directions of amberable light ID, the light rays do not penetrate inside the casing 50, or in any case do not emerge significantly. Only the incident rays having a direction D1 very close to the main direction AA can at once penetrate the whole and leave it; this

  corresponds to a very small part of the arbi-

  to hit the assembly according to the invention, especially since, as has been said, the ambient light, which comes from the sky or the sun, does not

  in general a direction close to the horizontal.

  - Accordingly, the light emission assembly according to the

  vention emits colored light when the lamp 10 is on, and when the lamp 10 is off, appears to the observer a neutral color, relatively white and bright, which is suitable

  particularly well to the stylists, as we have explained above.

  Many variants are possible without going outside the box

of the invention.

  For coloring, it is possible, as indicated, to replace the colored translucent screen 70 by other toyens.

  carmnus in themselves, for example a colored balloon circling judiciously

  the lamp 10, or a colored varnish covering the reflecting surface

pounding 21.

- - 6 -

  It is also possible, and this feature is part of the invention, to give the desired color to transparent slides,

  by simply associating them with a doubly reflective surface

  on its outer face which is turned towards the globe 60. Figure la illustrates this provision: the blades 110 are glass

  colored, or in a transparent colored plastic material. Alumina

  swimming 112 is applied on the only side ll0a.

  FIG. 2 represents a variant embodiment in which, symmetrically with respect to the horizontal plane of the axis AA,

  the blades 110 are given two opposite orientations. The blades

  above the horizontal plane of the axis AA are oblique and from top to bottom and from back to front, while, symmetrically, the blades below said plane are oblique from bottom to top and from back to front. Such an arrangement produces an overall result similar to what has just been described with a series of parallel blades having the same

  obliquity, except that, although some ambient light rays may

  wind inside the device (through the lower blades).

  laughter), they can not leave (thanks to the opposite obliquity of the upper blades). We can notice that this device of the figure la can make it possible to be freed from the presence of a cache

direct light such as 30.

  Your two examples that have just been given about

  FIGS. 1 and 2 are of course not limiting and it is possible to

  to see, without departing from the scope of the invention, many other modes of

production.

  On the other hand, while a simple emission set has been described, it should be understood that the invention applies to a more complex set comprising, behind a single transparent globe such as a plurality of light sources co-operating with a plurality of reflector elements for making multi-function illuminated sets, compartmentalized or not. It may be advantageous, in this case, to provide that a same set of blades will be used in cooperation with the various elementary systems of the assembly.

light emission.

  Moreover, it is possible, in a manner known in itself, to operate the mouse with dioptric myens and no longer with reflective means. In this case, a lens (eg a Fresnel lens) is arranged before the source to create the beam at one end; avantageuseent

  then the coloring can be incorporated into the lens itself.

  In such a construction, no ambient ray can

come out of the fire.

  Finally, it was observed that the car e rflis t blades gives the fire, seen from the outside when it is off, a bla-brilliant appearance quite reazquable on the plan

aesthetics.

Claims (10)

  1. Set of light emission, including signaling light   for a self-driving vehicle, of the type comprising a light source   mnineuse (10) and nmyens reflectors (20) or dioptriques   to celebrate with her and; send forward the light rays   received from the source, characterized in that it is at least   a series (100) of planar blades which are doubly reflective   (110) disposed in the path of light rays, so as to let out all the rays sent forward during the emission and to serve as a mask against the penetration of   most ambient light rays (DA) coming from outside.   2. A kit according to claim 1, characterized in that oenporte a single series of parallel double reflective lanes (110), these blades having a direction oblique direction of up and down and back to front.   3. An assembly according to claim 1, characterized by two   series of blades with opposite obliquities, namely a series   oblique from top to bottom and back to front, and a series   slats lower, oblique from bottom to top and from back to front.   4. Assembly according to one of claims 1 and 2, characterized   the fact that a direct light screen (30) is arranged   the lamp (10) to emulate the light rays to arrive direc-   on the series of blades (100) without prior reflection on the reflector.   5. Set according to one of claims 1 to 4, characterized   rised in that the rays pass through an element of coloring upstream of the series of blades.   6. Pack according to claim 5, characterized in that   the reflective toyens (20) are covered with a colored varnish.   7. An assembly according to claim 5, characterized in that   the light rays pass through a transparent colored channel (70).   8. Assembly according to one of claims 1, 2 and 3, characterized   characterized in that the reflective strips are transparent, incor-   porent a color that they transmit to the light rays output, and are made doubly reflective on their face 11Oa) turned to the outside. -9   9. Assembly according to one of claims 1 S., characterized   in that the obliquity, the dimension and the relative spacing of the parallel blades (110) are such that they project onto a plane   perpendicular to the exit direction (AA) without discontinuity   table and without significant overlap.   10. Seed according to one of claims 1, 2, 3, 9,   characterized by dioptric means consisting of a colored lens in front of the source to form the beam emitted by fire.