Dimmed vehicle headlight

Claim 1

A dimmed vehicle headlight comprising a light source extending in the direction of a light beam to be emitted; and a concave reflector surrounding the light source where planar sections through the reflector surface approximate sections of cones which have the same vertex point disposed in the opposite direction of the beam direction relative to the light source such that the vertex point forms the center of a Cartesian coordinate system and where the spacing of the close point of the light source relative to the vertex point is designated af f 1 and where the distance of the remote point of the light source relative to the vertex is designated as f 2 and where a y-axis is disposed at the connection line from the vertex to the light source and where the cone section shaped surfaces are in a coordinate system where an x-axis runs through the vertex point in a plane containing the respective cone section and where the cone sections approximate the following equation y.sup.2 (A)=2p(A)x+kp(A)x.sup.2 where A is the absolute value of the intersection angle of the respective cone section plane with a horizxontal plane, where p(A) is between about 0.95f 1 and 1.05f 1 for cone sections disposed in a horizontal plane containing the vertex point, where p(A) is between from about 2f 1 -f 2 to f 1 for the cone section disposed above said horizontal plane and disposed in a vertical plane, where p(A) is a continuous decreasing function of the angle A for cone sections disposed above said horizontal plane, where p(A) is about equal f 2 for the cone section disposed belowsaid horizontal plane and disposed in a vertical plane, with the proviso that at least for an intersection angle of cone section plane and horizontal plane of about 31 degrees the value p(A) starts to be different from P(O), and where k can have a value from about--0.02 to 0.02.

Claim 17

A method for producing a dimmed beam at a vehicle headlight comprising forming a concave reflector having an internal reflection surface where planar sections through the reflector surface approximate sections of cones which have the same vertex point disposed in the opposite direction of the beam direction relative to the light source such that the vertex point forms the center of a Cartesian coordinate system and where the spacing of the close point of the light source relative to the vertex point is designated as f 1 and where the distance of the remote point of the light source relative to the vertex is designated as f 2 and where a y-axis is disposed at the connection line from the vertex to the light source and where the cone section shaped surfaces are in a coordinate system where an x-axis runs through the vertex point in a plane containing the respective cone section and where the cone sections approximate the following equation y.sup.2 (A)=2p(A)x+kp(A)x.sup.2 where A is the absolute value of the intersection angle of the respective cone section plane with a horizontal plane, where p(A) is between about 0.95f 1 and 1.05f 1 for cone sections disposed in a horizontal plane containing the vertex point, where p(A) is between from about 2f 1 -f 2 to f 1 for the cone section disposed above said horizontal plane and disposed in a vertical plane, where p(A) is a continuous decreasing function of the angle A for cone sections disposed above said horizontal plane, where p(A) is about equal f 2 for the cone section disposed below said horizontal plane and disposed in a vertical plane, with the proviso that at least for an intersection angle of cone section plane and horizontal plane of about 31 degrees the value p(A) starts to be different from P(O), and where k cn have a value from about--0.02 to 0.02; and placing a light source in the reflector with the longitudinal extension of the light source at least in part coinciding with a line of focal points of cone section branches formed by intersecting the reflector surface with respective planes each including the axis of the reflector.

Claim 18

A method for producing a dimmed beam at a vehicle headlight comprising forming a concave reflector having an internal reflection surface where planar sections through the reflector surface approximate sections of cones which have the same vertex point disposed in the opposite direction of the beam direction relative to the light source such that the vertex point forms the center of a Cartesian coordinate system and where the spacing of the close point of the light source relative to the vertex point is designated as f 1 and where the distance of the remote point of the light source relative to the vertex is designated as f 2 and where a y-axis is disposed at the connection line from the vertex to the light source and where the cone section shaped surfaces are in a coordinate system where an x-axis runs through the vertex point in a plane containing the respective cone section and where the cone sections approximate the following equation y.sup.2 (A)=2p(A)x+kp(A)x.sup.2 where A is the absolute value of the intersection angle of the respective cone section plane with a horizontal plane, where p(A) is between about 0.95f 1 and 1.05f 1 for cone sections disposed in a horizontal plane containing the vertex point, where p(A) is between from about 2f 1 -f 2 to f 1 for the cone section disposed above said horizontal plane and disposed in a vertical plane, where p(A) is a continuous decreasing function of the angle A for cone sections disposed above said horizontal plane, where p(A) is about equal f 2 for the cone section disposed below said horizontal plane and disposed in a vertical plane, with the proviso that at least for an intersection angle of cone section plane and horizontal plane of about 31 degrees the value p(A) starts to be different from P(O), and where k cn have a value from about--0.02 to 0.02; and placing a light source in the reflector with the longitudinal extension of the light source at least in part coinciding with a line of focal points of cone section branches formed by intersecting the reflector surface with respective planes each including the axis of the reflector.