Patent Publication Number: US-2023139819-A1

Title: Vehicle headlight

Description:
FIELD OF THE DISCLOSURE 
     The present disclosure relates to a headlight lens for a vehicle headlight, for example for a motor vehicle headlight, the headlight lens having a one-piece body made of a transparent material with at least one light entrance surface and with at least one optically effective light exit surface. The disclosure also relates to a corresponding vehicle headlight and a corresponding primary optics. 
     BACKGROUND 
     WO 2012/072188 A1 discloses a headlight lens for a motor vehicle headlight, the headlight lens having a body made of a transparent material with at least one (for example optically effective) light entrance surface and with at least one optically effective light exit surface, and the body comprising a light tunnel which transitions with a bend into a light conducting part for imaging the bend as a bright dark boundary. 
     SUMMARY 
     The present disclosure concerns a vehicle headlight, for example a motor vehicle headlight, wherein the vehicle headlight comprises a light source assembly and a primary optics, for example a press-molded primary optics, for example a one-piece primary optics, wherein the primary optics comprises at least one light tunnel and a wedge-shaped light conducting part, for example a wedge-shaped light conducting part tapering in the course from top to bottom, with at least one, for example optically effective, light exit surface, wherein the light tunnel comprises at least one, for example optically effective, light entrance surface into which light generated by means of the light source assembly can be irradiated, the light tunnel transitions with a bend into the light conducting part, and the vehicle headlight comprising a secondary optics having an optically effective light exit surface for imaging a light exit surface of the primary optics and/or of the light conducting part or for imaging the bend. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    shows an embodiment of a motor vehicle, 
         FIG.  2    shows an embodiment of a motor vehicle headlight for use in the motor vehicle according to  FIG.  1    in a plan view, 
         FIG.  3    shows the motor vehicle headlight according to  FIG.  2    in a perspective side view, 
         FIG.  4    shows an enlarged sectional cross-section of a bend for the transition of a light tunnel into a light conducting part of a headlight lens according to  FIG.  3   , 
         FIG.  5    shows a sectional view of the light tunnel of the headlight lens according to  FIG.  3   , 
         FIG.  6    shows another sectional view of the light tunnel of the headlight lens according to  FIG.  3   , 
         FIG.  7    shows a flattened ellipsoid according to whose upper part the upward bounding surface of the light tunnel of the headlight lens according to  FIG.  3    is designed, 
         FIG.  8    shows the light exit surface of the headlight lens according to  FIG.  3    in a perspective view, 
         FIG.  9    shows an embodiment example for explaining (the parameters of) the function (distance function, distance function from the y-coordinate/y-axis) of an optically effective light exit surface of the headlight lens according to  FIG.  3   , 
         FIG.  10    shows an embodiment example for a vehicle headlight (without light source, housing, etc.) for alternative use instead of the vehicle headlight according to  FIG.  3    in a perspective view, wherein the vehicle headlight comprises a primary optics and a secondary optics arranged downstream of the primary optics (in the light path), 
         FIG.  11    shows the vehicle headlight according to  FIG.  10    in a view from below, 
         FIG.  12    shows a sectional view of the light tunnel of the primary optics according to  FIG.  10   , 
         FIG.  13    shows the vehicle headlight according to  FIG.  10    in a side view, 
         FIG.  14    shows a light distribution generated by means of the vehicle headlight according to  FIG.  10   . 
     
    
    
     DETAILED DESCRIPTION 
     The present disclosure concerns a vehicle headlight, for example a motor vehicle headlight, wherein the vehicle headlight comprises a light source assembly and a primary optics, for example a press-molded primary optics, for example a one-piece primary optics, wherein the primary optics comprises at least one light tunnel and a wedge-shaped light conducting part, for example a wedge-shaped light conducting part tapering in the course from top to bottom, with at least one, for example optically effective, light exit surface, wherein the light tunnel comprises at least one, for example optically effective, light entrance surface into which light generated by means of the light source assembly can be irradiated, the light tunnel transitions with a bend into the light conducting part, and the vehicle headlight comprising a secondary optics having an optically effective light exit surface for imaging a light exit surface of the primary optics and/or of the light conducting part or for imaging the bend. Wedge-shaped in the sense of the present disclosure means for example or by way of example the use of a blunt wedge, i.e. a wedge without a tip as illustrated for example in  FIG.  13   . The wedge angle is also referred to hereinafter as a bevel. An image in the sense of the present disclosure is for example also a distorting or distorted image. 
     It can be provided that the secondary optics comprises a, for example optically effective, for example essentially, plane light entrance surface, which is tilted with respect to the light exit surface of the primary optics by a tilt angle. 
     In an embodiment, the light exit surface of the primary optics is tilted with respect to an imaginary plane by a tilt angle, the imaginary plane having a normal in a z-direction, the z-direction being along the direction of one or the optical axis of the primary optics, the secondary optics, the light exit surface of the secondary optics, and/or a central segment of the light exit surface of the secondary optics. 
     In an embodiment, the wedge angle of the wedge-shaped light conducting part and the tilt angle are, for example essentially, equal. 
     The present disclosure concerns also a vehicle headlight, for example a motor vehicle headlight, wherein the vehicle headlight comprises a light source assembly and a primary optics, for example a press-molded primary optics, for example a one-piece primary optics, wherein the primary optics comprises at least one light tunnel and one, for example optically effective, light exit surface, wherein the light tunnel comprises at least one, for example optically effective, light entrance surface, into which light generated by means of the light source assembly can be irradiated, the vehicle headlight comprising a secondary optics having an optically effective light exit surface for imaging the light exit surface of the primary optics, and the secondary optics comprising an, for example optically effective, for example essentially, plane light entrance surface which is tilted by a tilt angle with respect to the light exit surface of the primary optics. 
     In an embodiment, the tilt angle extends in an imaginary plane spanned by a y-direction and a z-direction, wherein the y-direction extends, for example essentially, vertically when the vehicle headlight is used as intended, and wherein the z-direction extends along the direction of one or the optical axis of the primary optics, the secondary optics, the light exit surface of the secondary optics and/or a central segment of the light exit surface of the secondary optics. A y-direction in the sense of the present disclosure is for example a vertical direction or a vertical orientation. An x-direction in the sense of this disclosure is for example a horizontal direction or orientation. A y-direction within the meaning of this disclosure is for example orthogonal to the x-direction. Both an x-direction and a y-direction are for example orthogonal to a z-direction within the meaning of the present disclosure, wherein the z-direction is in the direction or orientation of one or the optical axis of the primary optics, the secondary optics, the light exit surface of the secondary optics, and/or a central segment of the light exit surface of the secondary optics. 
     The present disclosure concerns also a vehicle headlight, for example a motor vehicle headlight, the vehicle headlight comprising a light source assembly and a primary optics, for example a press-molded primary optics, for example a one-piece primary optics, the primary optics comprising at least one light tunnel and one, for example optically effective, light exit surface, the light tunnel comprising at least one, for example optically effective, light entrance surface, into which light generated by means of the light source assembly can be irradiated, the vehicle headlight comprising a secondary optics having an optically effective light exit surface for imaging the light exit surface of the primary optics, and the light exit surface of the primary optics being tilted by a tilt angle with respect to an imaginary plane, the imaginary plane having a normal in a z-direction, the z-direction being in the direction or orientation of one or the optical axis of the primary optics, the secondary optics, the light exit surface of the secondary optics and/or a central segment of the light exit surface of the secondary optics. 
     In an embodiment, at least a first part (starting from the or a light entrance surface of the light tunnel) of the surface bounding the light tunnel, for example upwards, is part of at least a first ellipsoid, the half-axis of which in the (horizontal) x-direction orthogonal to the optical axis of the light tunnel or to the extension of the light tunnel in the longitudinal direction or in the z-direction is, for example by at least 1.9 times, for example by at least three times, for example not more than twenty times, longer than its half-axis in the (vertical) y-direction, the y-direction being/running, for example essentially, orthogonally to the x-direction. 
     In an embodiment, at least a second part (starting from the or a light entrance surface of the light tunnel) of the surface bounding the light tunnel, for example upwards, is part of at least a second ellipsoid whose half-axis ratio differs from the half-axis ratio of the first ellipsoid. A half-axis ratio in the sense of the present disclosure is for example the ratio of the largest half-axis of an ellipsoid to its smallest half-axis. For example, it is provided that the largest half-axis is orthogonal to (aligned with) the half-axis considered to be the smallest half-axis. 
     In an embodiment, at least a second part (starting from the or a light entrance surface of the light tunnel) of the surface bounding the light tunnel, for example upwards, is part of a, for example essentially, rotationally symmetrical ellipsoid. 
     In an embodiment, the primary optics, for example essentially, comprises inorganic glass. 
     In an embodiment, the secondary optics are made, for example substantially, of plastic. 
     In a further embodiment, the wedge angle and/or the tilt angle is more than 2°. In a further embodiment, the wedge angle and/or the tilt angle is not more than 7°. In a further embodiment, the wedge angle and/or the tilt angle is between 5° and 6°. 
     The present disclosure concerns also a headlight lens for a vehicle headlight, for example for a motor vehicle headlight, having for example one or more of the above-mentioned features, the headlight lens comprising a body made of glass, for example a press-molded body, for example a one-piece body, the, for example one-piece, body comprising at least one light tunnel and a light conducting part with at least one optically effective light exit surface, the light tunnel comprising at least one, for example optically effective, light entrance surface and transitions in the light conducting part with a bend for imaging the bend as a bright dark boundary by means of light coupled into or radiated into the light entrance surface, wherein at least a first part (starting from the or a light entrance surface of the light tunnel) of the surface bounding the light tunnel, for example upwards, is part of at least a first ellipsoid, the half-axis of which in the (horizontal) x-direction orthogonal to the optical axis of the light tunnel or to the extension of the light tunnel in the longitudinal direction or in the z-direction is, for example by at least 1.9 times, for example by at least three times, for example not more than twenty times, longer than its half-axis in the (perpendicular) y-direction, the y-direction being/running, for example essentially, orthogonally to the x-direction, and a second part (starting from the or a light entrance surface of the light tunnel) of the surface bounding the light tunnel, for example upwards, being part of at least second ellipsoid, the half-axis ratio of which differs from the half-axis ratio of the first ellipsoid. 
     In an embodiment, the second ellipsoid is a, for example essentially, rotationally symmetric ellipsoid. 
     The present disclosure concerns also a primary optics, for example a press-molded primary optics, for example one-piece primary optics, having for example one or more of the above-mentioned features, the primary optics comprising at least one light tunnel and a wedge-shaped light conducting part, for example tapering in the course from top to bottom, with at least one, for example optically effective, light exit surface, the light tunnel comprising at least one, for example optically effective, light entrance surface, the light tunnel transitions with a bend into the light conducting part, wherein at least a first part (starting from the or a light entrance surface of the light tunnel) of the surface bounding the light tunnel, for example upwards, being part of at least a first ellipsoid, the half-axis of which in the (horizontal) x-direction orthogonal to the optical axis of the light tunnel or to the extension of the light tunnel in the longitudinal direction or in the z-direction is, for example at least 1.9 times, for example at least three times, for example not more than twenty times, longer than its half-axis in the (vertical) y-direction, wherein the y-direction, for example essentially, is/running orthogonal to the x-direction, and wherein a second part (starting from the or a light entrance surface of the light tunnel) of the surface bounding the light tunnel, for example upwards, is part of at least second ellipsoid, the half-axis ratio of which differs from the half-axis ratio of the first ellipsoid. 
     In an embodiment, the second ellipsoid is a, for example essentially, rotationally symmetric ellipsoid. 
     The present disclosure concerns also a headlight lens for a vehicle headlight, for example for a motor vehicle headlight, wherein the headlight lens comprises a body made of glass, for example a press-molded body, for example a one-piece body, wherein the, for example one-piece, body comprises at least one light tunnel and a light conducting part with at least one optically effective light exit surface, wherein the light tunnel comprises at least one light entrance surface, for example an optically effective light entrance surface, and transitions with a bend into the light conducting part for imaging the bend as a bright dark boundary by means of light coupled or irradiated into the light entrance surface, wherein a first part of the surface bounding the light tunnel, for example upwards,
         is part of an ellipsoid whose half-axis in the horizontal direction orthogonal to the optical axis of the light tunnel or to the extension of the light tunnel in the longitudinal direction is, for example by at least 1.9 times, for example by at least three times, for example not more than twenty times, longer than its half-axis in the vertical direction,
 
or
   part of an ellipsoid       

         E ( x,z;y )= E   a1,b1 ( z;y )× E   a2,b2 ( x;y )
 
       where 
         E   a1,b1 ( z;y ) 
       and 
         E   a2,b2 ( x;y ) 
     are two crossed ellipses, where z is a coordinate in the direction of the optical axis of the light tunnel and/or in the longitudinal direction of the light tunnel, where y is a coordinate in the vertical direction, where x is a coordinate orthogonal to the y direction and orthogonal to the z direction, where 
     
       
         
           
             
               
                 
                   
                     
                       E 
                       
                         
                           a 
                           1 
                         
                         , 
                         
                           b 
                           1 
                         
                       
                     
                     ( 
                     
                       z 
                       ; 
                       y 
                     
                     ) 
                   
                   : 
                 
               
               
                 
                   
                     
                       
                         z 
                         2 
                       
                       
                         a 
                         1 
                         2 
                       
                     
                     + 
                     
                       
                         y 
                         2 
                       
                       
                         b 
                         1 
                         2 
                       
                     
                   
                   = 
                   1 
                 
               
             
             
               
                 
                   
                     
                       E 
                       
                         
                           a 
                           2 
                         
                         , 
                         
                           b 
                           2 
                         
                       
                     
                     ( 
                     
                       x 
                       ; 
                       y 
                     
                     ) 
                   
                   : 
                 
               
               
                 
                   
                     
                       
                         x 
                         2 
                       
                       
                         a 
                         2 
                         2 
                       
                     
                     + 
                     
                       
                         y 
                         2 
                       
                       
                         b 
                         2 
                         2 
                       
                     
                   
                   = 
                   1 
                 
               
             
           
         
       
     
     where applies:
         1.9·b 1 ≤a 2  and/or   3·b 1 ≤a 2  and/or   0&lt;a 2 /a 2 ≤1.5 or 0≤a 1 /a 2 ≤1.5 and/or   a 2 ≤20·b 1  and/or   a 2 ≤50 b 1 .
 
wherein at least a second part of the surface bounding the light tunnel, for example upwards, is part of a, for example essentially, rotationally symmetrical ellipsoid. Rotationally symmetrical in the sense of the present disclosure is an ellipsoid for example if b 1  does not deviate from a 2  by more than 9%, for example by more than 5%. The quotient a 2 /b 1  is an embodiment example of a half-axis ratio in the sense of the present disclosure.
       

     The present disclosure concerns a vehicle headlight, for example a motor vehicle headlight, wherein the vehicle headlight comprises primary optics with an, for example press-molded, for example one-piece, body of glass, wherein the, for example one-piece, body comprises at least one light tunnel and a wedge-shaped light conducting part with at least one, for example optically effective, light exit surface, wherein the light tunnel comprises at least one, for example optically effective, light entrance surface and transitions with a bend into the light conducting part, the vehicle headlight comprising a secondary optics with an optically effective light exit surface for imaging an exit surface of the light conducting part or of the bend. 
     The inclination (wedge angle) of the wedge is for example more than 2°, not more than 7°, for example the inclination (wedge angle) of the wedge is between 5° and 6°. 
     In an embodiment, it is provided that at least a first part of the surface bounding the light tunnel, for example upwards, is at least
         part of an ellipsoid whose half-axis in the horizontal direction orthogonal to the optical axis of the light tunnel or to the extension of the light tunnel in the longitudinal direction is, for example by at least 1.9 times, for example by at least three times, for example not more than twenty times, longer than its half-axis in the vertical direction,
 
or
   part of an ellipsoid       

         E ( x,z;y )= E   a1,b1 ( z;y )× E   a2,b2 ( x;y )
 
       where 
         E   a1,b1 ( z;y ) 
       and 
         E   a2,b2 ( x;y ) 
     are two crossed ellipses, where z is a coordinate in the direction of the optical axis of the light tunnel and/or in the longitudinal direction of the light tunnel, where y is a coordinate in the vertical direction, where x is a coordinate orthogonal to the y direction and orthogonal to the z direction, where 
     
       
         
           
             
               
                 
                   
                     
                       E 
                       
                         
                           a 
                           1 
                         
                         , 
                         
                           b 
                           1 
                         
                       
                     
                     ( 
                     
                       z 
                       ; 
                       y 
                     
                     ) 
                   
                   : 
                 
               
               
                 
                   
                     
                       
                         z 
                         2 
                       
                       
                         a 
                         1 
                         2 
                       
                     
                     + 
                     
                       
                         y 
                         2 
                       
                       
                         b 
                         1 
                         2 
                       
                     
                   
                   = 
                   1 
                 
               
             
             
               
                 
                   
                     
                       E 
                       
                         
                           a 
                           2 
                         
                         , 
                         
                           b 
                           2 
                         
                       
                     
                     ( 
                     
                       x 
                       ; 
                       y 
                     
                     ) 
                   
                   : 
                 
               
               
                 
                   
                     
                       
                         x 
                         2 
                       
                       
                         a 
                         2 
                         2 
                       
                     
                     + 
                     
                       
                         y 
                         2 
                       
                       
                         b 
                         2 
                         2 
                       
                     
                   
                   = 
                   1 
                 
               
             
           
         
       
     
     where applies:
         1.9·b 1 ≤a 2  and/or   3·b 1 ≤a 2  and/or   0&lt;a 2 /a 2 ≤1.5 or 0≤a 1 /a 2 ≤1.5 and/or   a 2 ≤20·b 1  and/or   a 2 ≤50·b 1          

     In a further embodiment, it is provided that at least a second part of the surface bounding the light tunnel, for example upwards, is part of a, for example essentially, rotationally symmetrical ellipsoid. Rotationally symmetrical in the sense of the present disclosure is an ellipsoid for example if b 1  does not deviate from a 2  by more than 9%, for example by more than 5%. 
     In an embodiment, one or the right side surface of the light tunnel and/or one or the left side surface of the light tunnel is (at least partially) concavely curved. 
     In a further embodiment, one or the right and/or one or the left side surface of the light tunnel is (at least partially) curved according to a Bezier curve. In a further embodiment of the disclosure the following applies:
         0.3·d 1 ≤s 1 ≤0.7·d 1  and/or   0.4·d 2 ≤s 2 ≤1.5·d 2  and/or   1.5≤d 1 /d 2 ≤10 and/or   0.3≤g≤0.7,
 
when
   the starting point of the Bezier curve has the coordinates 0,0,   the end point of the Bezier curve has the coordinates d 1 , d 2 ,   the or a control point of the Bezier curve has the coordinates s 1 , s 2 , and/or   the or a control point of the Bezier curve has the weighting g.       

     In a further embodiment, the light tunnel is funnel-shaped, tapering toward the light entrance surface. In a further embodiment, the right and left side surfaces of the light tunnel form a portion of a funnel that tapers toward the light entrance surface. In one embodiment, the left side surface of the light tunnel is not symmetrical to the right side surface of the light tunnel. In one embodiment, the left side surface of the light tunnel is inclined with respect to the optical axis of the light tunnel. In one embodiment, the right side surface of the light tunnel is inclined with respect to the optical axis of the light tunnel. 
     An optically effective light entrance surface or an optically effective light exit surface is an optically effective surface of the one-piece body. An optically effective surface within the meaning of the disclosure is, for example, a surface of the transparent body on which light refraction occurs when the headlight lens is used as intended. An optically effective surface in the sense of the disclosure is for example a surface on which the direction of light passing through this surface is (specifically) changed when the headlight lens is used as intended. 
     For the purposes of the disclosure, glass is for example inorganic glass. For the purposes of the disclosure, glass or inorganic glass is for example silicate glass. Glass or inorganic glass in the sense of the disclosure is for example glass as described in WO 2009 109209 A1. Glass or inorganic glass within the meaning of the disclosure comprises for example
         0.2 to 2 wt.-% Al 2 O 3 ,   0.1 to 1 wt.-% Li 2 O,   0.3, for example 0.4, to 1.5 wt.-% Sb 2 O 3 ,   60 to 75 wt.-% SiO 2 ,   3 to 12 wt.-% Na 2 O,   3 to 12 wt.-% K 2 O and   3 to 12 wt.-% CaO.       

     For the purposes of the disclosure, press-molding means for example pressing an optically effective surface in such a way that subsequent finishing of the contour of this optically effective surface can be omitted or is omitted or is not provided. It is thus intended for example that a press-molded surface is not ground after the press-molding. 
     A light tunnel in the sense of the disclosure is characterized for example by the fact that substantially total reflection takes place at its lateral (for example top, bottom, right and/or left) surfaces, so that light entering through the light entrance surface is guided through the tunnel as a light guide. A light tunnel in the sense of the disclosure is for example a light guide. For example, it is provided that total reflection occurs at the longitudinal surfaces of the light tunnel. For example, it is provided that the longitudinal surfaces of the light tunnel are provided for total reflection. For example, it is provided that total reflection occurs at the surfaces of the light tunnel oriented essentially in the direction of the optical axis of the light tunnel. For example, it is provided that the surfaces of the light tunnel oriented substantially in the direction of the optical axis of the light tunnel are provided for total reflection. In an embodiment, it is provided that the light tunnel, for example in the region of the bend, has no reflective coating. 
     A bend in the sense of the disclosure is for example a curved transition. A bend in the sense of the disclosure is for example a transition curved with a radius of curvature of not less than 50 nm. For example, it is provided that the surface of the headlight lens in the bend has no discontinuity but a curvature. For example, it is provided that the surface of the headlight lens in the bend has a curvature, for example with a radius of curvature of the curvature in the bend of not less than 50 nm. In an embodiment, the radius of curvature is not greater than 5 mm. In an embodiment, the radius of curvature is not greater than 0.25 mm, for example not greater than 0.15 mm, for example not greater than 0.1 mm. In a further embodiment, the radius of curvature of the curvature in the bend is at least 0.05 mm. For example, it is provided that the surface of the headlight lens in the bend region is press-molded. 
     In a further embodiment, the light tunnel is funnel-shaped, tapering toward the light entrance surface. In a further embodiment, the right and left side surfaces of the light tunnel form a portion of a funnel that tapers toward the light entrance surface. In one embodiment, the left side surface of the light tunnel is not symmetrical to the right side surface of the light tunnel. In one embodiment, the left side surface of the light tunnel is inclined with respect to the optical axis of the light tunnel. In one embodiment, the right side surface of the light tunnel is inclined with respect to the optical axis of the light tunnel. 
     In an embodiment, the light exit surface is segmented. In a further embodiment, the light emitting surface comprises at least two segments. In a further embodiment, the light exit surface comprises at least three segments, for example a central segment surrounded by two edge segments. 
     A segment of a light exit surface in the sense of the disclosure is for example separated from another or further segment of the light exit surface by means of an indentation or a bend. A segment of a light exit surface in the sense of the disclosure is for example a surface according to a (mathematical or geometrical) function which differs from the (mathematical or geometrical) function of an adjacent segment. A segment in the sense of the disclosure is for example an optically effective surface according to a (mathematical or geometrical) function which differs from the (mathematical or geometrical) function of an adjacent segment. 
     In a further embodiment, it is provided that at least a part of the surface bounding the light tunnel, for example upwards, is part of an ellipsoid whose half-axis in the horizontal direction orthogonal to the optical axis of the light tunnel or to the extension of the light tunnel in the longitudinal direction is, for example at least 1.9 times, for example at least three times, for example not more than twenty times, longer than its half-axis in the vertical direction. 
     A light source assembly within the meaning of this disclosure is for example an arrangement of several LEDs, for example an arrangement of LEDs that are separated from each other. For example, it can be provided that a light entrance surface of a light tunnel is segmented and at least one LED or one OLED is assigned to different segments. A light source assembly within the meaning of the present disclosure comprises, for example, at least one LED or an arrangement of LEDs. In an embodiment, the light source comprises at least one OLED or an array of OLEDs. The light source may also be, for example, a planar light array. The light source may also comprise light element chips as disclosed in DE 103 15 131 A1. A light source may also be a laser. A usable laser is disclosed in ISAL 2011 Proceedings, page 271 ﬀ. 
     For example, it is envisaged that the bend, which is imaged as the bright dark boundary, is located in the lower region of the light tunnel. 
     In a further embodiment, the distance of the light source from the center of the light exit surface in orientation of the optical axis of the light tunnel and/or the light conducting part is not more than 8 cm. In a further embodiment, the length of the vehicle headlight (limited to light source and headlight lens) in orientation of the optical axis of the light tunnel and/or the light transmitting part is not more than 8 cm. 
     One or more additional light sources may be provided, the light from which is coupled or irradiated into the light conducting part and/or part of the light tunnel for implementing signlight, high beam and/or cornering light. When coupling such additional light into the light tunnel, it is particularly intended that this takes place in the half of the light tunnel that is closer to the light conducting part and/or in which the light entrance surface is not provided. 
     One or more additional light sources may be provided, the light from which is coupled or irradiated into the light conducting part and/or part of the light tunnel for implementing signlight, high beam and/or cornering light. When coupling such additional light into the light tunnel, it is provided for example that this is done in the half of the light tunnel that is closer to the light conducting part and/or in which the light entrance surface is not provided. Additional light source arrangements may be provided for example, as described or claimed in WO 2012/072192 A1. Additional light source arrangements are thereby described for example in FIGS. 10, 14, 15, 18, 19, 20 and 21 of WO 2012/072192 A1. The headlight lens according to the disclosure can for example also be used in arrays with mutually inclined optical axes, as is disclosed (or claimed), for example, in WO 2012/072193 A2, for example in FIG. 24 of WO 2012/072193 A2. Furthermore or alternatively, it may be envisaged that the headlight lens according to the disclosure is used in vehicle configurations as disclosed or claimed in WO 2012/072191 A2. 
     In a further embodiment, the light source and the (first) light entrance surface are configured and arranged relative to each other such that light from the light source enters the light entrance surface with a luminous flux density of at least 75 Im/mm. 2    
     The aforementioned headlight lenses can be manufactured by means of a process described in WO 2012/072188 A1 or in WO 2021 008657 A1. 
     It may be provided that a light entrance surface in the sense of the disclosure and/or a light exit surface in the sense of the disclosure has a light scattering structure. A light scattering structure in the sense of the disclosure may be, for example, a structure as disclosed in DE 10 2005 009 556 A1 and EP 1 514 148 A1 or EP 1 514 148 B1. It may be provided that a light tunnel is coated in the sense of the disclosure. It may be provided that a light tunnel in the sense of the disclosure is coated with a reflective layer. It may be provided that a light tunnel in the sense of the disclosure is mirrored. 
     A side surface of a light tunnel within the meaning of the disclosure is for example a surface laterally bounding the light tunnel. 
     Terms such as top, bottom, horizontal and vertical refer to intended use, i.e. these terms refer to the alignment in the installed state or in the installed state in a headlight or in the installed state in a motor vehicle. 
     The aforementioned task is also solved by a headlight lens, for example having one or more of the aforementioned features, or a primary optics, for example having one or more of the aforementioned features. 
     The present disclosure concerns further a motor vehicle with one of the aforementioned vehicle headlights. 
     Motor vehicle in the sense of the disclosure is for example a land vehicle which can be used individually in road traffic. Motor vehicles within the meaning of the disclosure are for example not limited to land vehicles with internal combustion engines. 
       FIG.  1    shows an embodiment of a motor vehicle  1  with a motor vehicle headlight  10 .  FIG.  2    shows the motor vehicle headlight  10  in a plan view with a headlight lens  100 , but without housing, holders and power supply, wherein the headlight lens  100  is shown in  FIG.  3    in a perspective side view, but also without housing, holders and power supply. The headlight lens  100  comprises a press-molded one-piece body made of inorganic glass, for example glass that
         0.2 to 2 wt.-% Al 2 O 3 ,   0.1 to 1 wt.-% Li 2 O,   0.3, for example 0.4, to 1.5 wt.-% Sb 2 O 3 ,   60 to 75 wt.-% SiO 2 ,   3 to 12 wt.-% Na 2 O,   3 to 12 wt.-% K 2 O and   3 to 12 wt.-% CaO,
 
comprises.
       

     The press-molded one-piece body comprises a light tunnel  108  shown in  FIG.  5    and in  FIG.  6    in a detailed cutaway view, the light tunnel  108  having on one side a segmented light entrance surface  101 , the segments or light entrance segments of which are designated  101 ′ and  101 ″ in  FIG.  6   . Accordingly, as shown in  FIG.  5    and  FIG.  6   , the front part  108 A of the light tunnel  108  is segmented on its upwardly bounded surface, with the upper segment surfaces following either flattened ellipsoids (segment  108 X) or rotationally symmetrical ellipsoids (segment  108 A). 
     On its side facing away from the light entrance surface  101 , the light tunnel  108  transitions with a bend  107 , shown enlarged in  FIG.  4   , into a light conducting part  109  (of the press-molded one-piece body) having a segmented light exit surface  102 , the segments of which are designated by reference signs  102 A,  102 B,  102 C and explained with reference to  FIG.  8    and  FIG.  9   . Reference numeral  110  denotes a Petzval surface of the light conducting part  109  facing the light tunnel. The headlight lens  100  is configured such that light entering the headlight lens  100  through the light entrance surface  101  and entering the light conducting part  109  in the region of the bend  107  from the light tunnel  108  exits essentially parallel to the optical axis of the headlight lens  100  from the light exit surface  102 . Light, which is irradiated by means of the LEDs  11  (arranged on a carrier  11 A) into the light entrance surfaces  101 ″ and  101 ′ of the left-hand segments  108 A″ and  108 A (when properly aligned) of the light tunnel  108  by means of the light source  11 , emerges predominantly or essentially from the segments  102 B and  102 A of the light exit surface  102 . Light irradiated by means of the LEDs  11  into the light entrance surfaces  101 ″ and  101 ″ of the right-hand segments  108 A″ and  108 A″ (when properly aligned) of the light tunnel  108  by means of the LEDs  11  emerges predominantly or essentially from the segments  102 C and  102 A of the light exit surface  102 . Light irradiated into the light entrance surface  101 ′ of the central segment  108 A of the light tunnel  108  by means of the LEDs  11  emerges predominantly or essentially from the segment  102 A of the light exit surface  102 . 
     The bend  107  is formed by press-molding and is designed as a continuously curved transition. The light conducting part  109  (or the light exit surface  102 ) images the bend  107  as a bright dark boundary, with light being radiated or coupled into the light entrance surface  101  of the light tunnel  108  by means of a light source assembly arranged on a carrier  11 A and designed as a plurality of LEDs  11  for implementation of a low beam. The light tunnel  108  has a transition region  108 B in which the surface bounding the light tunnel  108  upwardly rises toward the light conducting part  109 , and in which the surface bounding the light tunnel  108  downwardly is approximately horizontal or parallel to the optical axis of the headlight lens  100 . The motor vehicle headlight  10  may be supplemented by further light sources as disclosed in WO 2012/072188 A1 and WO 2012/072192 A1. For example, by means of a light source  12  that can optionally be switched in to implement a signal light or a high beam light, corresponding to the light source  12  disclosed in WO 2012/072188 A1, light can be coupled or irradiated into an underside of the light tunnel  108  and/or into the surface of the light conducting part  109  facing the light tunnel  108 . 
       FIG.  7    shows an embodiment of a flattened ellipsoid 
         E ( x,z;y )= E   a1,b1 ( z;y )× E   a2,b2 ( x;y )
 
       where 
         E   a1,b1 ( z;y ) 
       and 
         E   a2,b2 ( x;y ) 
     are two crossed ellipses (Here the cross “×” means that in x-direction and in y-direction is operated separately and the representation of the ellipsoid decomposes into that of two planar ellipses), where z is a coordinate in the direction of the optical axis of the light tunnel and/or in the longitudinal direction of the light tunnel, where y is a coordinate in the vertical direction, where x is a (horizontal) coordinate orthogonal to the y-direction and orthogonal to the z-direction, and where holds 
     
       
         
           
             
               
                 
                   
                     
                       E 
                       
                         
                           a 
                           1 
                         
                         , 
                         
                           b 
                           1 
                         
                       
                     
                     ( 
                     
                       z 
                       ; 
                       y 
                     
                     ) 
                   
                   : 
                 
               
               
                 
                   
                     
                       
                         z 
                         2 
                       
                       
                         a 
                         1 
                         2 
                       
                     
                     + 
                     
                       
                         y 
                         2 
                       
                       
                         b 
                         1 
                         2 
                       
                     
                   
                   = 
                   1 
                 
               
             
             
               
                 
                   
                     
                       E 
                       
                         
                           a 
                           2 
                         
                         , 
                         
                           b 
                           2 
                         
                       
                     
                     ( 
                     
                       x 
                       ; 
                       y 
                     
                     ) 
                   
                   : 
                 
               
               
                 
                   
                     
                       
                         x 
                         2 
                       
                       
                         a 
                         2 
                         2 
                       
                     
                     + 
                     
                       
                         y 
                         2 
                       
                       
                         b 
                         2 
                         2 
                       
                     
                   
                   = 
                   1 
                 
               
             
           
         
       
     
     Thereby is
         1.9·b 1 ≤a 2  and   1.9·b 1 ≤a 2  and/or   3·b 1 ≤a 2  and/or   0&lt;a 1 /a 2 ≤1.5 or 0≤a 1 /a 2 ≤1.5 and/or   a 2 ≤20·b 1  and/or   a 2 ≤50·b 1 .       

     The disclosure thus permits the production of a particularly low-cost headlight for motor vehicles with a high quality of illumination. 
       FIG.  10    shows a vehicle headlight  20 , for example a motor vehicle headlight.  FIG.  11    shows the vehicle headlight  20  in a view from below, and  FIG.  13    shows the vehicle headlight  20  in a side view. The vehicle headlight  20  comprises a primary optics  200 A having a body, for example a press-molded body, for example a one-piece body, made of inorganic glass, for example glass, which
         0.2 to 2 wt.-% Al 2 O 3 ,   0.1 to 1 wt.-% Li 2 O,   0.3, for example 0.4, to 1.5 wt.-% Sb 2 O 3 ,   60 to 75 wt.-% SiO 2 ,   3 to 12 wt.-% Na 2 O,   3 to 12 wt.-% K 2 O and   3 to 12 wt.-% CaO,
 
comprises.
       

     The, for example one-piece, body of the primary optics  200 A comprises at least one light tunnel  208  and a wedge-shaped light conducting part  209  with at least one, for example optically effective, light exit surface  209 A, wherein the light tunnel  208  comprises at least one, for example optically effective, light entrance surface  201  and transitions with a bend  207  into the light conducting part  209 . The bend  207  is formed (by press-molding) and is configured as a continuous and/or curved transition. 
     As shown in  FIG.  5    and  FIG.  12   , the front portion  208 A of the light tunnel  208  is segmented on its upwardly bounded surface, with the segment surfaces following either flattened ellipsoids (segment  208 A″) or rotationally symmetric ellipsoids (segment  208 A). The light tunnel  208  comprises a front portion  208 A configured to correspond to the front portion  108 A of the light tunnel  108  (see  FIG.  5    and  FIG.  12   ). Accordingly, the front portion  208 A of the light tunnel  208  (for example with respect to the portion corresponding to a flattened ellipsoid) is configured as described with respect to  FIG.  7   . 
     The vehicle headlight  20  comprises a secondary optics  200 B, for example made of plastic, for example made of PMMA, with an optically effective light exit surface  202  for imaging the light exit surface  209 A of the light conducting part  209  or the bend  207 . The light exit surface  202  is segmented, as shown for example in  FIG.  8   , the segments thereof being designated by reference signs  202 A,  202 B,  202 C. Light irradiated by means of the LEDs  11  into the light entrance surfaces  201 ″ and  201 ′ of the left segments  208 A″ and  208 A′ (when properly aligned) of the light tunnel  208  by means of the light source  11  emerges predominantly or essentially from the segments  202 B and  202 A of the light exit surface  202 . Light irradiated by means of the LEDs  11  into the light entrance surfaces  201 ″ and  201 ″ of the right-hand segments  208 A″ and  208 A″ (when properly aligned) of the light tunnel  208  by means of the LEDs  11  emerges predominantly or essentially from the segments  202 C and  202 A of the light exit surface  202 . Light irradiated into the light entrance surface  201 ′ of the central segment  208 A of the light tunnel  208  by means of the LEDs  11  emerges predominantly or essentially from the segment  202 A of the light exit surface  202 . 
     The light exit surfaces (surfaces) of segments  102 B and  102 C or  202 B and  202 C are defined or characterized as follows, compare  FIG.  9   : 
     
       
         
           
             
               r 
               ⁡ 
               ( 
               
                 Φ 
                 , 
                 y 
               
               ) 
             
             = 
             
               
                 f 
                 ⁡ 
                 ( 
                 Φ 
                 ) 
               
               - 
               
                 
                   
                     
                       f 
                       ⁡ 
                       ( 
                       Φ 
                       ) 
                     
                     ⁢ 
                     
                       ( 
                       
                         n 
                         - 
                         1 
                       
                       ) 
                     
                     ⁢ 
                     n 
                   
                   - 
                   
                     
                       
                         
                           n 
                           2 
                         
                         ( 
                         
                           n 
                           - 
                           1 
                         
                         ) 
                       
                       ⁢ 
                       
                         ( 
                         
                           
                             
                               
                                 f 
                                 ⁡ 
                                 ( 
                                 Φ 
                                 ) 
                               
                               2 
                             
                             ⁢ 
                             
                               ( 
                               
                                 n 
                                 - 
                                 1 
                               
                               ) 
                             
                           
                           - 
                           
                             
                               ( 
                               
                                 n 
                                 + 
                                 1 
                               
                               ) 
                             
                             ⁢ 
                             
                               y 
                               2 
                             
                           
                         
                         ) 
                       
                     
                   
                 
                 
                   
                     n 
                     2 
                   
                   - 
                   1 
                 
               
             
           
         
       
     
     Where n is the refractive index of the inorganic glass. f(ϕ) is defined as r(ϕ),y=0). The shape of the light exit surfaces or the surfaces of segments  102 B and  102 C or  202 B and  202 C further illustrates  FIG.  9   , where the source is located at the origin (0,0,0). Thereby: 
     
       
         
           
             
               r 
               ⁡ 
               ( 
               
                 
                   ϕ 
                   , 
                   y 
                 
                 = 
                 0 
               
               ) 
             
             = 
             
               N 
               
                 
                   
                     Y 
                     ⁡ 
                     ( 
                     
                       ϕ 
                       - 
                       
                         ϕ 
                         0 
                       
                     
                     ) 
                   
                   X 
                 
                 + 
                 
                   cos 
                   ⁡ 
                   ( 
                   ϕ 
                   ) 
                 
                 + 
                 
                   m 
                   · 
                   
                     sin 
                     ⁡ 
                     ( 
                     ϕ 
                     ) 
                   
                 
               
             
           
         
       
     
     ϕ describes the value at which the segments intersect. In the present embodiment, it is approximately 9° to 11°. The following also applies:
         N □[55 mm, 65 mm]   m □[0.2,0.3]   X □[1.0,4.0]   Y □[0,1]       

     The following values are provided in the present embodiment example:
         N=62.2553 mm   m=0.284369   X=1.5   Y=0.3       

     As shown in  FIG.  13   , the light conducting part  209  is wedge-shaped with a downwardly directed blunt end. The wedge-shaped light conducting part  209  tapers with a wedge angle α from the top in the downward direction, resulting in an inclined light exit surface  209 A of the light conducting part  209 . The primary optics  200 A and secondary optics  200 B are aligned with each other such that the light entrance surface  209 B of the secondary optics  200 B is tilted at a tilt angle β with respect to the light exit surface  209 A of the primary optics  209  such that the wedge angle α is approximately equal to the tilt angle β. For example, it is provided that the secondary optics  200 B is configured and arranged or aligned with respect to the primary optics  200 A such that the light exit surface  202  of the secondary optics  200 B images the light exit surface  209 A of the primary optics  200 A or the bend  207 . 
     With the exception of the illustration of the headlight or vehicle headlight  20  in  FIG.  13   , the other figures depicting vehicle headlights or parts of vehicle headlights (with the exception of the illustration of the flattened ellipsoid shown in  FIG.  7   ) are not drawn to scale. 
       FIG.  14    shows a light distribution generated by means of the vehicle headlight  20 . The disclosed vehicle headlight makes it possible in a particularly suitable manner to push the illumination below the bright dark boundary, increasing the horizontal illumination and reducing the vertical illumination. In addition, light is concentrated in the area of the bright dark boundary. 
     The disclosure specifies for example an improved headlight lens for a vehicle headlight, for example for a motor vehicle headlight. It is further an object of the disclosure to provide a correspondingly improved vehicle headlight or motor vehicle. It is further provided an improved vehicle headlight. Improved in this sense means, for example, an improved light distribution. For example, it is desirable that as little light as possible is emitted above a bright dark boundary. In addition, it is for example desirable that a light distribution in the horizontal direction is as extensive as possible, whereas the light distribution in the vertical direction should be as little extensive as possible. In addition, it is desirable to achieve a light intensity that is particularly high at the lower edge of the bright dark boundary.