EP0466605B1 - Reflector for a lighting device of an automotive vehicle, and headlight and signal light incorporating such a reflector - Google Patents

Description

The present invention relates generally to automotive lighting, and more particularly to a reflector of new design usable in a headlamp and in a signaling light, as well as a headlamp and a signaling light incorporating such a reflector.

We already know from patents FR-A-2 609 146 and FR-A-2 609 148 in the name of the Applicant a headlamp whose reflector comprises two lateral zones of conventional configuration, and for example either parabolic, or of the kind capable of forming by themselves a cut beam of determined shape, and a central zone whose profile in horizontal section is modified compared to said conventional configuration, that is to say deepened or flattened, while being connected essentially without breaking the slope with the side areas. The object of such a reflector is to create by itself, that is to say without the intervention of ice, a wider beam than with the conventional design, and also to avoid excessive concentration of light at center of the glass, which in particular allows the use of molded plastic glass.

Also known from patent FR-A-2 639 888 also in the name of the Applicant is a reflector which comprises central and lateral zones of conventional design, and two modified intermediate zones. On the one hand, such a reflector is capable of generating a cut beam, in particular a European standard beam with a so-called "V" cut, which has a large width and which defines the two half-planes over a large extent. cut-off (see in particular page 8, lines 1-15 of this request). Another object of this known type of reflector is to ensure that the light rays bypass a cache of direct light located in front of the lamp.

Finally, patent FR-A-2 634 003 discloses a reflector comprising, between main zones designed to give the beam a certain width, transition zones. This reflector corresponds to the preamble of claim 1. Such transition zones, or hyperbolas, do not, however, make it possible to avoid, by their own fact or by the very fact of the design of the main zones, zones of excessive concentration. of light appear at the level of the ice.

We can recall here the interest that it is the reflector which gives the beam its great width: indeed if this width is given by vertical or similar streaks provided on the ice, and that at the same time the glass is inclined to adapt to a strongly plunging profile from the front of the vehicle, so there is an undesirable folding of this beam towards the edges, as explained in particular in patent FR-A-2,542,422.

It turned out, however, that all the reflectors discussed above either offer a distribution of light which may lack homogeneity when a very large horizontal spread of the beam is required, or cause zones of excessive concentration of light at the level of the ice.

The present invention aims to overcome the drawbacks of the prior art and to provide a reflector which, by cooperating with a suitably positioned light source, is able to offer by itself a very wide beam, very homogeneous and defining a possible cut over a very large area, and which generates at the level of the glass a very homogeneous distribution of light, avoiding that a heating of said glass occurs at certain points thereof.

Another object of the invention is to propose at the same time a reflector capable of providing a lateral spreading of the beam greater than what was possible with the prior reflectors.

Thus the invention firstly relates to a reflector for a lighting device of a motor vehicle as defined in claim 1.

A preferred aspect of the reflector is set out in claim 2.

According to a second aspect, the invention relates to a headlight for a motor vehicle having the features of claim 3.

The closing glass can be, if desired, substantially inclined relative to the vertical and / or relative to the horizontal.

According to another aspect, the invention relates to a signaling light for a motor vehicle as defined in claim 5. Advantageously, the lens comprises means for spreading the beam essentially in the vertical direction only.

As a variant, a signaling light for a motor vehicle is proposed as defined in claim 7.

Preferably, the lens comprises means for spreading the beam essentially in the horizontal direction only.

In one or other of the above lights, the spreading means are preferably constituted by parallel ridges oriented perpendicular to the direction of spreading.

• la figure 1 est une vue de dos schématique permettant de comprendre la conception d'un réflecteur selon la présente invention,
• la figure 2 est une vue en coupe horizontale axiale du réflecteur de la figure 1,
• la figure 3 est une vue en coupe horizontale axiale d'une forme de réalisation concrète d'un réflecteur de l'invention, illustrant les trajets d'un certain nombre de rayons lumineux,
• les figures 4a et 4b illustrent la répartition de la lumière obtenue au niveau de la glace, respectivement dans l'art antérieur et avec la présente invention,
• les figures 5a, 5b à 8a, 8b illustrent par des courbes isolux des faisceaux obtenus, sur écran normalisé à 25 m, respectivement avec des réflecteurs de l'art antérieur et des réflecteur de la présente invention, en l'absence de glace,
• les figures 9 et 10 illustrent deux modes de réalisation possibles d'un feu de signalisation réalisé conformément à la présente invention.

Other aspects, aims and advantages of the present invention will appear better on reading the following detailed description of preferred embodiments thereof, given by way of non-limiting example and made with reference to the accompanying drawings, in which :

• FIG. 1 is a schematic rear view allowing the design of a reflector according to the present invention to be understood,
• FIG. 2 is a view in axial horizontal section of the reflector of FIG. 1,
• FIG. 3 is a view in axial horizontal section of a concrete embodiment of a reflector of the invention, illustrating the paths of a certain number of light rays,
• FIGS. 4a and 4b illustrate the distribution of the light obtained at the level of the glass, respectively in the prior art and with the present invention,
• FIGS. 5a, 5b to 8a, 8b illustrate by isolux curves of the beams obtained, on a screen standardized to 25 m, respectively with reflectors of the prior art and reflectors of the present invention, in the absence of ice,
• Figures 9 and 10 illustrate two possible embodiments of a signaling light produced in accordance with the present invention.

It will be noted at the outset that, from one figure to another, identical or similar elements or parts have been designated by the same reference signs.

We will now describe in detail, in mathematical terms, a preferred example of a reflector produced in accordance with the present invention.

The reflector, designated by the reference 20, comprises at least in a central region a plurality of reflective zones which are in this case separated from each other by vertical planes parallel to an optical axis defined by the reflector and designated by Ox. The optical role of these zones will be explained later.

As will be seen in detail, each of the zones is connected to its neighbor continuously in second order, that is to say that, on either side of the transition plane considered, the planes tangent to the reflecting surface are the same. In other words, there is no kink or break in the reflective surface.

We will first of all define the dimensions in the horizontal direction (along the transverse horizontal axis Oy as illustrated) of a certain number of vertical planes parallel to Ox:
y _GL and y _DL are the end dimensions, to the left and to the right of the center of the reflector, of a central region of the reflector produced according to the invention;
at these dimensions, the reflected rays undergo a zero horizontal deviation;
y _{G 2} and y _{D 2} are dimensions at which the reflected rays undergo a first maximum horizontal deviation;
y _G and y _D are dimensions at which the reflected rays undergo zero horizontal deviation; and
y _GM and y _DM are dimensions at which the reflected rays undergo a second maximum horizontal deviation.

All of the above odds are expressed as positive numbers.

We will now define a certain number of parameters, to be chosen by the designer, involved in the mathematical formulation of this example embodiment:
Θ _GF and Θ _DF are the angles of first maximum horizontal deviation of the reflected rays, of negative signs;
Θ _G and Θ _D are the angles of second maximum horizontal deviation of the reflected rays, of positive signs;
NB is a dimensionless positive real number expressing the degree of deformation (with respect to a parabolic section) of the central region of the reflector between the dimensions y _G and y _GL on the one hand and the dimensions y _D and y _DL on the other go;
NC is a dimensionless positive real number expressing the degree of deformation (with respect to a parabolic section) of the central region between y _G and y _D ; and
f _G and f _D are basic focal distances respectively to the left and to the right of the vertex O of the reflector.

   On calcule ensuite quatre autres groupes de paramètres (en faisant intervenir, par souci de simplification, des paramètres intermédiaires AA, A, B et C à chaque fois différents):

• a) calcul de x_DECG, f_GI, A_GM et A_GM1.
  On pose:
  
  $$\begin{array}{c}\begin{array}{c}\text{A = 1}\\ {\text{B = AA + f}}_{\text{G}}\\ {\text{C = AA.f}}_{\text{G}}{\text{- (y}}_{\text{GM}}{\text{)²/4 + (y}}_{\text{GM}}{\text{).(y}}_{\text{GM}}{\text{-y}}_{\text{G}}\text{).(NB+2)/8NB}\\ {\text{x}}_{\text{DECG}}\text{= (-B + √Δ)/2A avec Δ= B²-4AC}\\ {\text{f}}_{\text{GI}}{\text{= f}}_{\text{G}}{\text{+ x}}_{\text{DECG}}\\ {\text{A}}_{\text{GM}}{\text{= [y}}_{\text{GM}}{\text{/2f}}_{\text{G}}{\text{- y}}_{\text{GM}}{\text{/2f}}_{\text{GI}}{\text{+ 2A}}_{\text{GL}}{\text{.(y}}_{\text{GM}}{\text{-y}}_{\text{GL}}{\text{)]/2(y}}_{\text{GM}}{\text{-y}}_{\text{G}}\text{)}\\ {\text{A}}_{\text{GM1}}{\text{= A}}_{\text{GM}}{\text{/(y}}_{\text{GM}}{\text{-y}}_{\text{G}}{\text{)}}^{\text{NB-2}}\end{array}\end{array}$$
  
• b) calcul de x_DECGI, f_C, A_GC et A_GC1.
  On pose:
  
  $$\begin{array}{c}\begin{array}{c}\text{A = 1}\\ {\text{B = AA + f}}_{\text{GI}}\\ {\text{C = AA.f}}_{\text{GI}}{\text{- (y}}_{\text{G/2}}{\text{)²/4 + (y}}_{\text{G/2}}\text{)².(NC+2)/8NC}\\ {\text{x}}_{\text{DECGI}}\text{= (-B + √Δ)/2A avec Δ = B²-4AC}\\ {\text{f}}_{\text{C}}{\text{= f}}_{\text{GI}}{\text{- x}}_{\text{DECGI}}\\ {\text{A}}_{\text{GC}}{\text{= [y}}_{\text{G/2}}{\text{/2f}}_{\text{GI}}{\text{- y}}_{\text{G 2}}{\text{/2f}}_{\text{C}}{\text{+2A}}_{\text{G}}{\text{(y}}_{\text{G/2}}{\text{-y}}_{\text{G}}{\text{)]/y}}_{\text{G}}\\ {\text{A}}_{\text{GC1}}{\text{= A}}_{\text{GC}}{\text{/(y}}_{\text{G/2}}{\text{)}}^{\text{NC-2}}\end{array}\end{array}$$
  
• c) calcul de x_DECDI, f_DI, A_DC et A_DC1.
  On pose:
  
  $$\begin{array}{c}\begin{array}{c}\text{A = -1}\\ {\text{B = AA - f}}_{\text{C}}\\ {\text{C = (y}}_{\text{D/2}}{\text{)²/4 - (y}}_{\text{D 2}}{\text{)².(NC+2)/8NC + AA.f}}_{\text{C}}\\ {\text{x}}_{\text{DECDI}}\text{= (-B - √ Δ)/2A avec Δ = B²-4AC}\\ {\text{f}}_{\text{DI}}{\text{= f}}_{\text{C}}{\text{+ x}}_{\text{DECDI}}\\ {\text{A}}_{\text{DC}}{\text{= y}}_{\text{D/2}}{\text{/2f}}_{\text{DI}}{\text{- y}}_{\text{D/2}}{\text{/2f}}_{\text{C}}{\text{+ 2A}}_{\text{D}}{\text{(y}}_{\text{D/2}}{\text{-y}}_{\text{D}}{\text{)/y}}_{\text{D}}\\ {\text{A}}_{\text{DC1}}{\text{= A}}_{\text{DC}}{\text{/(y}}_{\text{D/2}}{\text{)}}^{\text{NC-2}}\end{array}\end{array}$$
  
• d) calcul de x_DECGI, f_C, A_GC et A_GC1.
  On pose:
  
  $$\begin{array}{c}\begin{array}{c}\text{A = -1}\\ {\text{B = AA - f}}_{\text{DI}}\\ {\text{C = (y}}_{\text{DM}}{\text{)²/4 + AA.f}}_{\text{DI}}{\text{- (y}}_{\text{DM}}{\text{).(y}}_{\text{DM}}{\text{).(y}}_{\text{DM}}{\text{-y}}_{\text{D}}\text{).(NB+2)/8NB}\\ {\text{x}}_{\text{DECD}}\text{= (-B - √Δ)/2A avec Δ = B²-4AC}\\ {\text{f}}_{\text{D}}{\text{= f}}_{\text{DI}}{\text{+ x}}_{\text{DECD}}\\ {\text{A}}_{\text{DM}}{\text{= [y}}_{\text{DM}}{\text{/2f}}_{\text{D}}{\text{- y}}_{\text{DM}}{\text{/2f}}_{\text{DI}}{\text{+ 2A}}_{\text{DL}}{\text{.(y}}_{\text{DM}}{\text{-y}}_{\text{DL}}{\text{)]/2(y}}_{\text{DM}}{\text{-y}}_{\text{D}}\text{)}\\ {\text{a}}_{\text{DM1}}{\text{= A}}_{\text{DM}}{\text{/(y}}_{\text{DM}}{\text{-y}}_{\text{D}}{\text{)}}^{\text{NB-2}}\text{.}\end{array}\end{array}$$
  

We then proceed to calculate a first group of other parameters, as follows: $$\begin{array}{c}\begin{array}{c}{\text{AT}}_{\text{GL}}{\text{= tg (Θ}}_{\text{G}}{\text{) / 2 (y}}_{\text{GM}}{\text{-y}}_{\text{GL}}\text{)}\\ {\text{AT}}_{\text{DL}}{\text{= tg (Θ}}_{\text{D}}{\text{) / 2 (y}}_{\text{DM}}{\text{-y}}_{\text{DL}}\text{)}\\ {\text{AT}}_{\text{GL1}}{\text{= A}}_{\text{GL}}{\text{/ (y}}_{\text{GM}}{\text{-y}}_{\text{GL}}{\text{)}}^{\text{(NB-2)}}\\ {\text{AT}}_{\text{DL1}}{\text{= A}}_{\text{DL}}{\text{/ (y}}_{\text{DM}}{\text{-y}}_{\text{DL}}{\text{)}}^{\text{(NB-2)}}\\ {\text{AT}}_{\text{G}}{\text{= -tg (Θ}}_{\text{GF}}{\text{) / y}}_{\text{G}}\\ {\text{AT}}_{\text{D}}{\text{= -tg (Θ}}_{\text{DF}}{\text{) / y}}_{\text{G}}\\ {\text{AT}}_{\text{G1}}{\text{= -A}}_{\text{G}}{\text{/ (y}}_{\text{G / 2}}{\text{)}}^{\text{(NC-2)}}\\ {\text{AT}}_{\text{D1}}{\text{= -A}}_{\text{D}}{\text{/ (y}}_{\text{D / 2}}{\text{)}}^{\text{(NC-2)}}\end{array}\end{array}$$

Four other groups of parameters are then calculated (using, for the sake of simplification, intermediate parameters AA, A, B and C each time different):

• a) calculation of x _DECG , f _GI , A _GM and A _GM1 .
  We ask:
  
  $$\begin{array}{c}\begin{array}{c}\text{A = 1}\\ {\text{B = AA + f}}_{\text{G}}\\ {\text{C = AA.f}}_{\text{G}}{\text{- (y}}_{\text{GM}}{\text{) ² / 4 + (y}}_{\text{GM}}{\text{). (y}}_{\text{GM}}{\text{-y}}_{\text{G}}\text{). (NB + 2) / 8NB}\\ {\text{x}}_{\text{DECG}}\text{= (-B + √Δ) / 2A with Δ = B²-4AC}\\ {\text{f}}_{\text{GI}}{\text{= f}}_{\text{G}}{\text{+ x}}_{\text{DECG}}\\ {\text{AT}}_{\text{GM}}{\text{= [y}}_{\text{GM}}{\text{/2 F}}_{\text{G}}{\text{- y}}_{\text{GM}}{\text{/2 F}}_{\text{GI}}{\text{+ 2A}}_{\text{GL}}{\text{(y}}_{\text{GM}}{\text{-y}}_{\text{GL}}{\text{)] / 2 (y}}_{\text{GM}}{\text{-y}}_{\text{G}}\text{)}\\ {\text{AT}}_{\text{GM1}}{\text{= A}}_{\text{GM}}{\text{/ (y}}_{\text{GM}}{\text{-y}}_{\text{G}}{\text{)}}^{\text{NB-2}}\end{array}\end{array}$$
  
• b) calculation of x _DECGI , f _C , A _GC and A _GC1 .
  We ask:
  
  $$\begin{array}{c}\begin{array}{c}\text{A = 1}\\ {\text{B = AA + f}}_{\text{GI}}\\ {\text{C = AA.f}}_{\text{GI}}{\text{- (y}}_{\text{G / 2}}{\text{) ² / 4 + (y}}_{\text{G / 2}}\text{) ². (NC + 2) / 8NC}\\ {\text{x}}_{\text{DECGI}}\text{= (-B + √Δ) / 2A with Δ = B²-4AC}\\ {\text{f}}_{\text{VS}}{\text{= f}}_{\text{GI}}{\text{- x}}_{\text{DECGI}}\\ {\text{AT}}_{\text{GC}}{\text{= [y}}_{\text{G / 2}}{\text{/2 F}}_{\text{GI}}{\text{- <figure-callout id="2" label="y G" filenames="imgf0001.png,imgf0002.png" state="{{state}}">y </figure-callout>}}_{\text{G}}{\text{/2 F}}_{\text{VS}}{\text{+ 2A}}_{\text{G}}{\text{(y}}_{\text{G / 2}}{\text{-y}}_{\text{G}}{\text{)] / y}}_{\text{G}}\\ {\text{AT}}_{\text{GC1}}{\text{= A}}_{\text{GC}}{\text{/ (y}}_{\text{G / 2}}{\text{)}}^{\text{NC-2}}\end{array}\end{array}$$
  
• c) calculation of x _DECDI , f _DI , A _DC and A _DC1 .
  We ask:
  
  $$\begin{array}{c}\begin{array}{c}\text{A = -1}\\ {\text{B = AA - f}}_{\text{VS}}\\ {\text{C = (y}}_{\text{D / 2}}{\text{) ² / 4 - (y}}_{\text{D 2}}{\text{) ². (NC + 2) / 8NC + AA.f}}_{\text{VS}}\\ {\text{x}}_{\text{DECDI}}\text{= (-B - √ Δ) / 2A with Δ = B²-4AC}\\ {\text{f}}_{\text{DI}}{\text{= f}}_{\text{VS}}{\text{+ x}}_{\text{DECDI}}\\ {\text{AT}}_{\text{DC}}{\text{= y}}_{\text{D / 2}}{\text{/2 F}}_{\text{DI}}{\text{- y}}_{\text{D / 2}}{\text{/2 F}}_{\text{VS}}{\text{+ 2A}}_{\text{D}}{\text{(y}}_{\text{D / 2}}{\text{-y}}_{\text{D}}{\text{) / y}}_{\text{D}}\\ {\text{AT}}_{\text{DC1}}{\text{= A}}_{\text{DC}}{\text{/ (y}}_{\text{D / 2}}{\text{)}}^{\text{NC-2}}\end{array}\end{array}$$
  
• d) calculation of x _DECGI , f _C , A _GC and A _GC1 .
  We ask:
  
  $$\begin{array}{c}\begin{array}{c}\text{A = -1}\\ {\text{B = AA - f}}_{\text{DI}}\\ {\text{C = (y}}_{\text{DM}}{\text{) ² / 4 + AA.f}}_{\text{DI}}{\text{- (y}}_{\text{DM}}{\text{). (y}}_{\text{DM}}{\text{). (y}}_{\text{DM}}{\text{-y}}_{\text{D}}\text{). (NB + 2) / 8NB}\\ {\text{x}}_{\text{DECD}}\text{= (-B - √Δ) / 2A with Δ = B²-4AC}\\ {\text{f}}_{\text{D}}{\text{= f}}_{\text{DI}}{\text{+ x}}_{\text{DECD}}\\ {\text{AT}}_{\text{DM}}{\text{= [y}}_{\text{DM}}{\text{/2 F}}_{\text{D}}{\text{- y}}_{\text{DM}}{\text{/2 F}}_{\text{DI}}{\text{+ 2A}}_{\text{DL}}{\text{(y}}_{\text{DM}}{\text{-y}}_{\text{DL}}{\text{)] / 2 (y}}_{\text{DM}}{\text{-y}}_{\text{D}}\text{)}\\ {\text{at}}_{\text{DM1}}{\text{= A}}_{\text{DM}}{\text{/ (y}}_{\text{DM}}{\text{-y}}_{\text{D}}{\text{)}}^{\text{NB-2}}\text{.}\end{array}\end{array}$$
  

Whatever type of beam to obtain, the equation of the reflecting surface involves yet another group of parameters, the values of which are determined from the parameters mentioned so far and vary according to the dimension according to y, denoted y₀ , from the current point on the horizontal generator represented in FIG. 2 with respect to the dimensions of the various axial vertical planes mentioned above. This other group of parameters includes the parameters α, α₁, β, β₁, f₀, x _DIF , y _S , y _M , y _L and N.

• a) si |y₀| ≧ y_GL $$\begin{array}{c}\begin{array}{c}\text{α = 0 β = 0}\\ \text{α₁ = 0 β₁ = 0}\\ {\text{f₀ = f}}_{\text{G }}{\text{y}}_{\text{S}}{\text{= y}}_{\text{G}}\\ {\text{y}}_{\text{M}}{\text{= y}}_{\text{GM}}\\ {\text{y}}_{\text{L}}{\text{= y}}_{\text{GL}}\\ {\text{x}}_{\text{DIF}}\text{= 0}\\ \text{N = NB}\end{array}\end{array}$$
  
• b) si y_GM ≦ |y₀| ≦ y_GL $$\begin{array}{c}\begin{array}{c}{\text{α = A}}_{\text{GL }}\text{β = 0}\\ {\text{α₁ = A}}_{\text{GL1 }}\text{β₁ = 0}\\ {\text{f₀ = f}}_{\text{G }}{\text{y}}_{\text{S}}{\text{= y}}_{\text{G}}\\ {\text{y}}_{\text{M}}{\text{= y}}_{\text{GM}}\\ {\text{y}}_{\text{L}}{\text{= y}}_{\text{GL}}\\ {\text{x}}_{\text{DIF}}\text{= 0}\\ \text{N = NB}\end{array}\end{array}$$
  
• c) si y_G ≦ |y₀| ≦ y_GM $$\begin{array}{c}\begin{array}{c}{\text{α = 0 β = A}}_{\text{GM}}\\ {\text{α₁ = 0 β₁ = A}}_{\text{GM1}}\\ {\text{f₀ = f}}_{\text{GI }}{\text{y}}_{\text{S}}{\text{= y}}_{\text{G}}\\ {\text{y}}_{\text{M}}{\text{= y}}_{\text{GM}}\\ {\text{y}}_{\text{L}}{\text{= y}}_{\text{GL}}\\ {\text{x}}_{\text{DIF}}{\text{= -x}}_{\text{DECG}}\\ \text{N = NB}\end{array}\end{array}$$
  
• d) si y_G/2 ≦ |y₀| ≦ y_G $$\begin{array}{c}\begin{array}{c}{\text{α = A}}_{\text{G}}\text{ β = 0}\\ {\text{α₁ = A}}_{\text{G1}}\text{ β₁ = 0}\\ {\text{f₀ = f}}_{\text{GI}}{\text{ y}}_{\text{S}}\text{= 0}\\ {\text{y}}_{\text{M}}{\text{= y}}_{\text{G/2}}\\ {\text{y}}_{\text{L}}{\text{= y}}_{\text{G}}\\ {\text{x}}_{\text{DIF}}{\text{= -x}}_{\text{DECG}}\\ \text{N = NC>}\end{array}\end{array}$$
  
• e) si |y₀| ≦ y_G/2 $$\begin{array}{c}\begin{array}{c}{\text{α = 0 β = A}}_{\text{GC}}\\ {\text{α₁ = 0 β₁ = A}}_{\text{GC1}}\\ {\text{f₀ = f}}_{\text{C}}{\text{ y}}_{\text{S}}\text{= 0}\\ {\text{y}}_{\text{M}}{\text{= y}}_{\text{G/2}}\\ {\text{y}}_{\text{L}}{\text{= y}}_{\text{G}}\\ {\text{x}}_{\text{DIF}}{\text{= -x}}_{\text{DECG}}{\text{- x}}_{\text{DECGI}}\\ \text{N = NC}\end{array}\end{array}$$
  
• f) si |y₀| ≧ y_DL $$\begin{array}{c}\begin{array}{c}\text{α = 0 β = 0}\\ \text{α₁ = 0 β₁ = 0}\\ {\text{f₀ = f}}_{\text{D}}{\text{ y}}_{\text{S}}{\text{= y}}_{\text{D}}\\ {\text{y}}_{\text{M}}{\text{= y}}_{\text{DM}}\\ {\text{y}}_{\text{L}}{\text{= y}}_{\text{DL}}\\ {\text{x}}_{\text{DIF}}{\text{= -x}}_{\text{DECG}}{\text{- x}}_{\text{DECGI}}{\text{- x}}_{\text{DECD}}{\text{- x}}_{\text{DECDI}}\\ \text{N = NB}\end{array}\end{array}$$
  
• g) si y_DM ≦ |y₀| ≦ y_DL $$\begin{array}{c}\begin{array}{c}{\text{α = A}}_{\text{DL}}\text{ β = 0}\\ {\text{α₁ = A}}_{\text{DL1}}\text{ β₁ = 0}\\ {\text{f₀ = f}}_{\text{D}}{\text{ y}}_{\text{S}}{\text{= y}}_{\text{D}}\\ {\text{y}}_{\text{M}}{\text{= y}}_{\text{DM}}\\ {\text{y}}_{\text{L}}{\text{= y}}_{\text{DL}}\\ {\text{x}}_{\text{DIF}}{\text{= -x}}_{\text{DECG}}{\text{- x}}_{\text{DECGI}}{\text{- x}}_{\text{DECD}}{\text{- x}}_{\text{DECDI}}\\ \text{N = NB}\end{array}\end{array}$$
  
• h) si y_D ≦ |y₀| ≦ y_DM $$\begin{array}{c}\begin{array}{c}{\text{α = 0 β = A}}_{\text{DM}}\\ {\text{α₁ = 0 β₁ = A}}_{\text{DM1}}\\ {\text{f₀ = f}}_{\text{DI}}{\text{ y}}_{\text{S}}{\text{= y}}_{\text{D}}\\ {\text{y}}_{\text{M}}{\text{= y}}_{\text{DM}}\\ {\text{y}}_{\text{L}}{\text{= y}}_{\text{DL}}\\ {\text{x}}_{\text{DIF}}{\text{= -x}}_{\text{DECG}}{\text{- x}}_{\text{DECGI}}{\text{- x}}_{\text{DECDI}}\\ \text{N = NB}\end{array}\end{array}$$
  
• i) si y_D/2 ≦ |y₀| ≦ y_D $$\begin{array}{c}\begin{array}{c}{\text{α = A}}_{\text{D}}\text{ β = 0}\\ {\text{α₁ = A}}_{\text{D1}}\text{ β₁ = 0}\\ {\text{f₀ = f}}_{\text{DI}}{\text{ y}}_{\text{S}}\text{= 0}\\ {\text{y}}_{\text{M}}{\text{= y}}_{\text{D/2}}\\ {\text{y}}_{\text{L}}{\text{= y}}_{\text{D}}\\ {\text{x}}_{\text{DIF}}{\text{= -x}}_{\text{DECG}}{\text{- x}}_{\text{DECGI}}{\text{- x}}_{\text{DECDI}}\\ \text{N = NC}\end{array}\end{array}$$
  
• j) si |y₀| ≦ y_D/2 $$\begin{array}{c}\begin{array}{c}{\text{α = 0 β = A}}_{\text{DC}}\\ {\text{α₁ = 0 β₁ = A}}_{\text{DC1}}\\ {\text{f₀ = f}}_{\text{C}}{\text{ y}}_{\text{S}}\text{= 0}\\ {\text{y}}_{\text{M}}{\text{= y}}_{\text{D/2}}\\ {\text{y}}_{\text{L}}{\text{= y}}_{\text{D}}\\ {\text{x}}_{\text{DIF}}{\text{= -x}}_{\text{DECG}}{\text{- x}}_{\text{DECGI}}\\ \text{N = NC}\end{array}\end{array}$$
  

   On va tout d'abord indiquer ci-dessous l'équation donnant la coordonnée x₀ du point courant en fonction de sa coordonnée y₀, c'est-à-dire l'équation de la génératrice dans le plan x0y d'un réflecteur selon cet exemple de réalisation: $${\text{x₀ = y₀²/4f₀ + α₁.(|y₀|-y}}_{\text{L}}{\text{)}}^{\text{N}}{\text{/N + α.(|y₀|-y}}_{\text{L}}{\text{)²/2 + β.(|y₀|-y}}_{\text{s}}{\text{)²/2 + β₁.(|y₀|-y}}_{\text{s}}{\text{)}}^{\text{N}}{\text{/N + x}}_{\text{DIF}}$$

   On va maintenant donner les équations de différentes surfaces réfléchissantes selon l'invention, qui ont pour caractéristique d'être toutes basées sur la même génératrice horizontale de correspondre à différents faisceaux formés. Plus précisément, en gardant la même génératrice horizontale, on conserve les propriétés (détaillées plus loin) de répartition en largeur du faisceau, tandis qu'un profil- différent du réflecteur dans des plans verticaux va permettre de donner des faisceaux correspondant à différentes photométries requises (notamment faisceau de croisement européen ou américain, faisceau anti-brouillard ou encore faisceau de route).The values of these parameters as a function of the dimension y₀ of the current point on the generator are expressed below:

• a) if | y₀ | ≧ y _GL $$\begin{array}{c}\begin{array}{c}\text{α = 0 β = 0}\\ \text{α₁ = 0 β₁ = 0}\\ {\text{f₀ = f}}_{\text{G}}{\text{y}}_{\text{S}}{\text{= y}}_{\text{G}}\\ {\text{y}}_{\text{M}}{\text{= y}}_{\text{GM}}\\ {\text{y}}_{\text{L}}{\text{= y}}_{\text{GL}}\\ {\text{x}}_{\text{DIF}}\text{= 0}\\ \text{N = NB}\end{array}\end{array}$$
  
• b) if y _GM ≦ | y₀ | ≦ y _GL $$\begin{array}{c}\begin{array}{c}{\text{α = A}}_{\text{GL}}\text{β = 0}\\ {\text{α₁ = A}}_{\text{GL1}}\text{β₁ = 0}\\ {\text{f₀ = f}}_{\text{G}}{\text{y}}_{\text{S}}{\text{= y}}_{\text{G}}\\ {\text{y}}_{\text{M}}{\text{= y}}_{\text{GM}}\\ {\text{y}}_{\text{L}}{\text{= y}}_{\text{GL}}\\ {\text{x}}_{\text{DIF}}\text{= 0}\\ \text{N = NB}\end{array}\end{array}$$
  
• c) if y _G ≦ | y₀ | ≦ y _GM $$\begin{array}{c}\begin{array}{c}{\text{α = 0 β = A}}_{\text{GM}}\\ {\text{α₁ = 0 β₁ = A}}_{\text{GM1}}\\ {\text{f₀ = f}}_{\text{GI}}{\text{y}}_{\text{S}}{\text{= y}}_{\text{G}}\\ {\text{y}}_{\text{M}}{\text{= y}}_{\text{GM}}\\ {\text{y}}_{\text{L}}{\text{= y}}_{\text{GL}}\\ {\text{x}}_{\text{DIF}}{\text{= -x}}_{\text{DECG}}\\ \text{N = NB}\end{array}\end{array}$$
  
• d) if y _{G / 2} ≦ | y₀ | ≦ y _G $$\begin{array}{c}\begin{array}{c}{\text{α = A}}_{\text{G}}\text{β = 0}\\ {\text{α₁ = A}}_{\text{G1}}\text{β₁ = 0}\\ {\text{f₀ = f}}_{\text{GI}}{\text{y}}_{\text{S}}\text{= 0}\\ {\text{y}}_{\text{M}}{\text{= y}}_{\text{G / 2}}\\ {\text{y}}_{\text{L}}{\text{= y}}_{\text{G}}\\ {\text{x}}_{\text{DIF}}{\text{= -x}}_{\text{DECG}}\\ \text{N = NC>}\end{array}\end{array}$$
  
• e) if | y₀ | ≦ y _{G / 2} $$\begin{array}{c}\begin{array}{c}{\text{α = 0 β = A}}_{\text{GC}}\\ {\text{α₁ = 0 β₁ = A}}_{\text{GC1}}\\ {\text{f₀ = f}}_{\text{VS}}{\text{y}}_{\text{S}}\text{= 0}\\ {\text{y}}_{\text{M}}{\text{= y}}_{\text{G / 2}}\\ {\text{y}}_{\text{L}}{\text{= y}}_{\text{G}}\\ {\text{x}}_{\text{DIF}}{\text{= -x}}_{\text{DECG}}{\text{- x}}_{\text{DECGI}}\\ \text{N = NC}\end{array}\end{array}$$
  
• f) if | y₀ | ≧ y _DL $$\begin{array}{c}\begin{array}{c}\text{α = 0 β = 0}\\ \text{α₁ = 0 β₁ = 0}\\ {\text{f₀ = f}}_{\text{D}}{\text{y}}_{\text{S}}{\text{= y}}_{\text{D}}\\ {\text{y}}_{\text{M}}{\text{= y}}_{\text{DM}}\\ {\text{y}}_{\text{L}}{\text{= y}}_{\text{DL}}\\ {\text{x}}_{\text{DIF}}{\text{= -x}}_{\text{DECG}}{\text{- x}}_{\text{DECGI}}{\text{- x}}_{\text{DECD}}{\text{- x}}_{\text{DECDI}}\\ \text{N = NB}\end{array}\end{array}$$
  
• g) if y _DM ≦ | y₀ | ≦ y _DL $$\begin{array}{c}\begin{array}{c}{\text{α = A}}_{\text{DL}}\text{β = 0}\\ {\text{α₁ = A}}_{\text{DL1}}\text{β₁ = 0}\\ {\text{f₀ = f}}_{\text{D}}{\text{y}}_{\text{S}}{\text{= y}}_{\text{D}}\\ {\text{y}}_{\text{M}}{\text{= y}}_{\text{DM}}\\ {\text{y}}_{\text{L}}{\text{= y}}_{\text{DL}}\\ {\text{x}}_{\text{DIF}}{\text{= -x}}_{\text{DECG}}{\text{- x}}_{\text{DECGI}}{\text{- x}}_{\text{DECD}}{\text{- x}}_{\text{DECDI}}\\ \text{N = NB}\end{array}\end{array}$$
  
• h) if y _D ≦ | y₀ | ≦ y _DM $$\begin{array}{c}\begin{array}{c}{\text{α = 0 β = A}}_{\text{DM}}\\ {\text{α₁ = 0 β₁ = A}}_{\text{DM1}}\\ {\text{f₀ = f}}_{\text{DI}}{\text{y}}_{\text{S}}{\text{= y}}_{\text{D}}\\ {\text{y}}_{\text{M}}{\text{= y}}_{\text{DM}}\\ {\text{y}}_{\text{L}}{\text{= y}}_{\text{DL}}\\ {\text{x}}_{\text{DIF}}{\text{= -x}}_{\text{DECG}}{\text{- x}}_{\text{DECGI}}{\text{- x}}_{\text{DECDI}}\\ \text{N = NB}\end{array}\end{array}$$
  
• i) if y _{D / 2} ≦ | y₀ | ≦ y _D $$\begin{array}{c}\begin{array}{c}{\text{α = A}}_{\text{D}}\text{β = 0}\\ {\text{α₁ = A}}_{\text{D1}}\text{β₁ = 0}\\ {\text{f₀ = f}}_{\text{DI}}{\text{y}}_{\text{S}}\text{= 0}\\ {\text{y}}_{\text{M}}{\text{= y}}_{\text{D / 2}}\\ {\text{y}}_{\text{L}}{\text{= y}}_{\text{D}}\\ {\text{x}}_{\text{DIF}}{\text{= -x}}_{\text{DECG}}{\text{- x}}_{\text{DECGI}}{\text{- x}}_{\text{DECDI}}\\ \text{N = NC}\end{array}\end{array}$$
  
• j) if | y₀ | ≦ y _{D / 2} $$\begin{array}{c}\begin{array}{c}{\text{α = 0 β = A}}_{\text{DC}}\\ {\text{α₁ = 0 β₁ = A}}_{\text{DC1}}\\ {\text{f₀ = f}}_{\text{VS}}{\text{y}}_{\text{S}}\text{= 0}\\ {\text{y}}_{\text{M}}{\text{= y}}_{\text{D / 2}}\\ {\text{y}}_{\text{L}}{\text{= y}}_{\text{D}}\\ {\text{x}}_{\text{DIF}}{\text{= -x}}_{\text{DECG}}{\text{- x}}_{\text{DECGI}}\\ \text{N = NC}\end{array}\end{array}$$
  

We will first indicate below the equation giving the x₀ coordinate of the current point as a function of its y₀ coordinate, i.e. the equation of the generator in the x0y plane of a reflector according to this example of realization: $${\text{x₀ = y₀² / 4f₀ + α₁. (| y₀ | -y}}_{\text{L}}{\text{)}}^{\text{NOT}}{\text{/ N + α. (| Y₀ | -y}}_{\text{L}}{\text{) ² / 2 + β. (| Y₀ | -y}}_{\text{s}}{\text{) ² / 2 + β₁. (| Y₀ | -y}}_{\text{s}}{\text{)}}^{\text{NOT}}{\text{/ N + x}}_{\text{DIF}}$$

We will now give the equations of different reflective surfaces according to the invention, which have the characteristic of being all based on the same horizontal generator to correspond to different beams formed. More precisely, by keeping the same horizontal generator, the beam width distribution properties are preserved (detailed below), while a profile different from the reflector in vertical planes will make it possible to give beams corresponding to different photometries required. (including European or American passing beam, anti-fog beam or high beam).

où $$\begin{array}{c}\begin{array}{c}{\text{S = α₁ (|y|-y}}_{\text{L}}{\text{)}}^{\text{N}}{\text{/N + α (|y|-y}}_{\text{L}}{\text{)²/2 + β₁(|y|-y}}_{\text{s}}{\text{)}}^{\text{N}}{\text{/N + β (|y|-y}}_{\text{S}}{\text{)²/2 + x}}_{\text{DIF}}\\ {\text{T = (|y|/y).[α₁(|y|-y}}_{\text{L}}{\text{)}}^{\text{N-1}}{\text{+ α(|y|-y}}_{\text{L}}{\text{) + β₁(|y|-y}}_{\text{S}}{\text{)}}^{\text{N-1}}{\text{+ β(|y|-y}}_{\text{S}}\text{)}\\ {\text{ε}}_{\text{Z}}\text{= |z|/z}\\ \text{ℓ = demi-longueur du filament 10.}\end{array}\end{array}$$

The equation given below is that of a reflector intended to form a flat horizontal cut, in particular for an anti-fog beam, in cooperation with an axial filament offset upward relative to the optical axis, while being essentially tangent to said axis:

or $$\begin{array}{c}\begin{array}{c}{\text{S = α₁ (| y | -y}}_{\text{L}}{\text{)}}^{\text{NOT}}{\text{/ N + α (| y | -y}}_{\text{L}}{\text{) ² / 2 + β₁ (| y | -y}}_{\text{s}}{\text{)}}^{\text{NOT}}{\text{/ N + β (| y | -y}}_{\text{S}}{\text{) ² / 2 + x}}_{\text{DIF}}\\ {\text{T = (| y | / y). [Α₁ (| y | -y}}_{\text{L}}{\text{)}}^{\text{N-1}}{\text{+ α (| y | -y}}_{\text{L}}{\text{) + β₁ (| y | -y}}_{\text{S}}{\text{)}}^{\text{N-1}}{\text{+ β (| y | -y}}_{\text{S}}\text{)}\\ {\text{ε}}_{\text{Z}}\text{= | z | / z}\\ \text{ℓ = half-length of the <figure-callout id="10" label="filament" filenames="imgf0001.png,imgf0002.png" state="{{state}}">filament</figure-callout> 10.}\end{array}\end{array}$$

It should be noted that from the above equation, those skilled in the art will know how to design a reflector intended for example to form a passing beam according to European standards. Reference will be made in particular to patents FR-A-2 536 502 and FR-A-2 599 121 in the name of the Applicant, the respective contents of which are incorporated into the present description by reference, and which indicate the manner of combining surfaces basic self-generating of a straight cut and paraboloidal surfaces to form the cut called "V".

It can also be noted that an equation suitable for a standard H4 type lamp is obtained by simply setting ℓ = 0 in equation (2) above.

où
S, T et ℓ sont comme défini ci-dessus, et $${\text{ε}}_{\text{YZ}}\text{= |yz|/yz}$$

   Un tel réflecteur peut être utilisé avantageusement pour réaliser un projecteur antibrouillard à filament transversal, ou encore un projecteur code/route à filament transversal conforme aux règlementations américaines. D'autres détails de tels projecteurs sont décrits dans FR-A-2 602 305 et FR-A-2 602 306 au nom de la Demanderesse.We will now indicate the equation of a reflecting surface intended to be associated with a transversely oriented filament (as described in particular in FR-A-2 602 305) to form a beam delimited by an essentially straight cut:

or
S, T and ℓ are as defined above, and $${\text{ε}}_{\text{YZ}}\text{= | yz | / yz}$$

Such a reflector can advantageously be used to produce a fog light with a transverse filament, or even a code / road projector with a transverse filament in accordance with American regulations. Other details of such projectors are described in FR-A-2 602 305 and FR-A-2 602 306 in the name of the Applicant.

• les zones 201g et 201d, situées respectivement dans les intervalles [0,y_G/2] et [0, y_D/2], dont les rayons réfléchis passent progressivement d'une déviation horizontale nulle (fond du réflecteur) et une première déviation horizontale maximale divergente (respectivement Θ_GF et Θ_DF) à la cote respective y_G/2, y_D/2;
• les zones 202g et 202d (intervalles respectifs [y_G/2, y_GM] et [y_D/2, y_DM]), dont les rayons réfléchis passent progressivement de ladite première déviation horizontale maximale à une seconde déviation horizontale maximale convergente, respectivement Θ_G et Θ_D, en passant par une déviation nulle aux cotes respectives y_G et y_D; et
• les zones 203g et 203d (intervalles respectifs [y_GM, y_GL] et [y_DM, y_DL], dont les rayons réfléchis passent progressivement de ladite seconde déviation horizontale maximale à une déviation nulle.

Illustrated in Figure 3, in axial horizontal section a concrete embodiment of a reflector of the invention, as well as the vertical projection, in the horizontal plane xOy, paths of a certain number of light rays from different areas of the reflector. We can observe the role played by the different zones of the central region of the reflector, and in particular, on either side of the central axis 0x and moving away from it:

• zones 201g and 201d, located respectively in the intervals [0, y _{G / 2} ] and [0, y _{D / 2} ], whose reflected rays progressively pass from a zero horizontal deviation (bottom of the reflector) and a first deviation divergent maximum horizontal (respectively Θ _GF and Θ _DF ) at the respective dimension y _{G / 2} , y _{D / 2} ;
• zones 202g and 202d (respective intervals [y _{G / 2} , y _GM ] and [y _{D / 2} , y _DM ]), the reflected rays of which pass progressively from said first maximum horizontal deviation to a second maximum converging horizontal deviation, respectively Θ _G and Θ _D , passing through a zero deviation at the respective dimensions y _G and y _D ; and
• the areas 203g and 203d (respective intervals [y _GM , y _GL ] and [y _DM , y _DL ], the reflected rays of which pass progressively from said second maximum horizontal deviation to zero deviation.

It can be easily demonstrated by calculation that the different areas mentioned connect with each other with continuity (in this example a second order continuity), which facilitates the production of a molded reflector and minimizes optical anomalies.

We observe in these figures that at the dimensions 0, y _G , y _D , y _GL and y _DL , the deviations are very zero; moreover, the deviations evolve continuously between these zero values and the extremes Θ _G , Θ _F , Θ _GF and Θ _DF .

The central region of the reflector, in the case where it is desired that the beam obtained comprises a spot of central concentration of light intensity greater than a given threshold (imposed for example by a regulation), is extended on one side or two sides by one or two zones whose horizontal profile is parabolic (zones 204g and 204d), so that all the reflected rays propagate in vertical planes essentially parallel to the optical axis 0x as illustrated. Such lateral zones 204g, 204d are in practice useful for a headlamp reflector, while they can be omitted for signaling lights, in which a high point concentration in the axis is generally not necessary.

It is also observed in FIG. 3 that the light rays at the level of the closing glass 30 are well dispersed. More precisely, it appears that the ice is not the seat of any excessive convergence or concentration of light rays. FIGS. 4a and 4b have shown on this subject isolux curves measured on the ice, corresponding respectively to a reflector of conventional design (parabola associated with a standard lamp H4) and to a reflector of the present invention. For each curve is indicated the corresponding value in kilolux. The maximum light intensity obtained is 142 kilolux in the prior art, and 92 kilolux with the present invention.

Such a significant reduction in the intensity of the central peak of light also decreases the heating of the ice at this location, and allows the use of molded plastic glass, which will not risk heating up and deforming.

Returning to FIG. 3, it is also observed that the path of the reflected rays is such that it allows the incorporation of a direct light mask known per se, designated by the reference 11 and shown diagrammatically in dashed lines, without that none of the reflected rays is intercepted by this cache.

Finally, it will be noted that we have defined sets of different parameters (with indices respectively. "G" and "D" for the left and right parts of the reflector; this makes it possible to design an asymmetrical reflector if necessary; but in a form of particular implementation, the parameters on the left and on the right can be identical.

• la figure 5b illustre un faisceau de croisement obtenu avec un réflecteur selon l'invention et le filament de croisement occulté d'une lampe normalisée H4, tandis qu'à titre de comparaison, la figure 5a illustre le faisceau obtenu avec le même filament et un réflecteur parabolique de l'art antérieur;
• la figure 6b montre un faisceau de route obtenu avec le même réflecteur que pour la figure 5b et le filament de route de la lampe H4, tandis que la figure 6a montre le faisceau de route obtenu avec le réflecteur paraboliqe conventionnel;
• la figure 7b représente un faisceau anti-brouillard obtenu avec un filament axial et le réflecteur de l'invention, la figure 7a montrant quant à elle le faisceau obtenu avec le même filament et le réflecteur conventionnel décrit dans FR-A-2 536 503 de la Demanderesse;
• la figure 8b représente le faisceau obtenu avec un filament transversal et un réflecteur selon l'invention, tandis que la figure 8a représente le faisceau correspondant, convenant pour un projecteur antibrouillard ou un projecteur de croisement aux normes américaines, avec un ensemble réflecteur/lampe décrit dans FR-A-2 602 305 ou FR-A-2 602 306.

To illustrate the advantages of the present invention in terms of beam width and homogeneity, the drawings show, by isolux curves, various types of beams as they appear in the absence of the closing glass. :

• FIG. 5b illustrates a passing beam obtained with a reflector according to the invention and the passing filament obscured by a standard lamp H4, while for comparison, FIG. 5a illustrates the beam obtained with the same filament and a parabolic reflector of the prior art;
• FIG. 6b shows a driving beam obtained with the same reflector as for FIG. 5b and the driving filament of the lamp H4, while FIG. 6a shows the driving beam obtained with the conventional parabolic reflector;
• FIG. 7b represents an anti-fog beam obtained with an axial filament and the reflector of the invention, FIG. 7a showing the beam obtained with the same filament and the conventional reflector described in FR-A-2 536 503 of the Applicant;
• FIG. 8b represents the beam obtained with a transverse filament and a reflector according to the invention, while FIG. 8a represents the corresponding beam, suitable for a fog light or a dipped beam projector according to American standards, with a reflector / lamp assembly described in FR-A-2 602 305 or FR-A-2 602 306.

The plots of the various isolux curves are to be considered as included in the present description.

For each of the beams obtained with reflectors of the invention, good homogeneity and a very large width are observed. As already explained above, the work to be carried out by the glass in width is therefore reduced, or even nonexistent, so that the use of a glass even strongly inclined (45 ° or more) does not induce any undesirable bending of the beam towards its edges.

Now with reference to FIGS. 9 and 10, a description will be given of signaling lights which can use the principles of the present invention.

A signaling light conventionally comprises a lamp incorporating a filament 10, a reflector 20 and a closing globe 30. In this kind of known light, the reflector and of the parabolic kind, and essentially spherical balls are provided on the surface of the globe for ensure proper dispersion of the beam formed in order to meet photometric regulatory requirements. More specifically, the balls provide dispersion upwards and downwards as well as laterally to the left and to the right, so that the fire appears with satisfactory light intensity when viewed at an angle to the optical axis. xx.

According to the invention, for example a reflector of the type described above is used in order to spread the beam in one direction (horizontal or vertical), while using the globe to spread the beam in the 'other direction (vertical or horizontal).

Thus, thanks to this aspect of the invention, since the globe must only spread in one direction, one can use on it no longer balls, but streaks, horizontal or vertical. This aspect of the invention is particularly interesting in particular from an aesthetic point of view, the current criteria increasingly requiring the use of globes of striated appearance in one direction or the other. With a lamp according to the invention, this can be obtained without requiring significant modification of the components of the lamp, therefore without significantly increasing the cost price.

Thus, FIG. 9 represents a light, the reflector 20 of which spreads the beam in a horizontal direction (spreading angles Θ _H ), while the globe 30 is equipped for example on its internal surface with horizontal ridges 31, in particular cylindrical, which spread in a vertical direction according to the spreading angles Θ _V.

In Figure 10, the reflector is designed to spread the beam vertically (angles Θ _V ) while the globe 30 has vertical streaks 31 to perform the horizontal spreading at angles Θ _H. Such goes particularly well with a projector with vertical streaks on its lens.

Preferably, but not exclusively, the concepts as described above are used to make the reflector, since there is then the advantage of obtaining an extremely homogeneous distribution of light at the level of the globe. In the case of figure 10, these concepts apply to a rotation of 90 ° near, obtained simply by permutation of the coordinates x and y.

However, other reflectors capable of offering a spread in one direction and of illuminating the globe relatively homogeneously can of course be used without departing from the scope of the invention.

Concretely, reflectors according to the present invention can be produced by machining a mold using a computer-aided manufacturing apparatus, appropriately programmed and into which the basic parameters necessary will have been introduced after having chosen them. values.

Of course, the present invention is in no way limited to the embodiment described above and shown in the drawings, but those skilled in the art will be able to make any variant or modification included within the scope of the claims.

Claims (9)

1. A reflector (20) for a motor vehicle lighting device designed to be associated with a light source (10) to form a beam of given configuration, the reflector comprising a plurality of zones that are separated from one another by planes that are essentially vertical and parallel to an optical axis defined by said reflector, and that join one another without discontinuity, said zones comprising, on either side of a central vertical plane (x0z) and going away therefrom:
      a first zone (201g, 201d) in which the reflected rays pass progressively with increasing distance from said central vertical plane, from zero horizontal deflection to a first maximum horizontal deflection (ϑ_GF, ϑ_DF);
      a second zone (202g, 202d) in which the reflected rays pass progressively, with increasing distance from said central vertical plane, from said first maximum horizontal deflection to a converging second maximum horizontal deflection (ϑ_G, ϑ_D), passing locally through zero horizontal deflection; and
      a third zone (203g, 203d) in which the reflected rays pass progressively, with increasing distance from said central vertical plane, from said second maximum horizontal deflection to zero horizontal deflection,
      the reflector being characterized in that said first maximum horizontal deflection (ϑ_GF, ϑ_GD) is diverging deflection.
2. A reflector according to claim 1, characterized in that it further comprises, on at least one side of said central vertical plane, a fourth zone (204g, 204d) that does not deflect light rays significantly in a horizontal direction.
3. A motor vehicle headlight characterized in that it comprises a light source (10), a reflector (20) according to claim 2, and a closure glass (30) that deflects light little or not at all in a horizontal direction, the reflector also being suitable for deflecting light rays in a vertical direction so as to bring them beneath a cutoff.
4. A motor vehicle headlight according to claim 3, characterized in that the closure glass (30) is significantly inclined relative to the vertical and/or relative to the horizontal.
5. A motor vehicle signalling light of the type comprising a light source (10), a reflector (20), and a closure glass (30), characterized in that the reflector is implemented according to claim 1 or 2.
6. A signalling light according to claim 5, characterized in that the glass includes spreading means (31) for spreading the beam essentially in a vertical direction only.
7. A motor vehicle signalling light of the type comprising a light source (10), a reflector (20), and a closure globe (30), characterized in that the reflector includes a plurality of zones that are separated from one another by planes that are essentially horizontal and parallel to an optical axis defined by said reflector, and that join one another without discontinuity, and in that said zones comprise, on either side of a central horizontal plane and going away therefrom:
      a first zone in which the reflected rays pass progressively with increasing distance from said horizontal plane, from zero vertical deflection to a diverging first maximum vertical deflection;
      a second zone in which the reflected rays pass progressively, with increasing distance from said central horizontal plane, from said first maximum vertical deflection to a converging second maximum vertical deflection, passing locally through zero vertical deflection; and
      a third zone in which the reflected rays pass progressively with increasing distance from said central horizontal plane, from said second maximum vertical deflection to zero vertical deflection.
8. A signalling light according to claim 7, characterized in that the glass includes spreading means (31) for spreading the beam essentially in a horizontal direction only.
9. A signalling light according to claim 6 or 8, characterized in that the spreading means are constituted by parallel stripes (31) extending perpendicularly to the spreading direction.

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