Low beam or fog headlamp for motor vehicles
AssigneeRobert Bosch GmbH
InventorsChristian Lietar, Peter Perthus
Life of this patent
Estimating the term…
Abstract
An antidazzle headlamp has a reflector which is asymmetric relative to a horizontal plane passing through an optical axis of the reflector. The contours of the reflector corresponding to vertical sections in parallel planes forming right angles with a horizontal plane passing through the optical axis, form an upper and a lower half ellipse. Both half ellipses in each vertical section have a common large axis which is staggered upward relative to the horizontal plane. In this manner an antidazzle light beam is created which guarantees an intensive and complete illumination of edges of a roadway even at a close range from the motor vehicle.
Claims11
A low beam or fog headlamp for motor vehicles comprising a reflector defining a vertex, an optical axis and a focal point, sections of said reflector in planes passing through said optical axis forming curves of higher order, a light source arranged at said focal point, a screen having an edge for delimiting a light-dark boundary plane for a light beam emitted by the light source, a light projecting objective arranged in front of said screen, said curves of higher order being asymmetric relative to a horizontal plane passing through said optical axis, vertical sections of said reflector in parallel planes including right angles with said horizontal plane forming closed curves, the part of respective closed curves lying above said horizontal plane defining an upper half ellipse having a small axis and the part of corresponding closed curves lying below said horizontal plane defining a lower half ellipse having a small axis of different length, and both half ellipses in the respective vertical sections having a common large axis.
A low beam or fog headlamp for motor vehicles, comprising a reflector defining a vertex, an optical axis and a focal point, sections of said reflector in planes passing through said optical axis forming curves of higher order, a light source arranged in said focal point, a screen having an edge for delimiting a light-dark boundary plane for a light beam emitted by the light source, a light projecting objective arranged in front of said screen, said curves of higher order being asymmetric relative to a horizontal plane passing through said optical axis, vertical sections of said reflector in parallel planes including right angles with said horizontal plane forming closed curves, the part of respective closed curves lying to the left of a vertical plane passing through said optical axis defining a left half ellipse and the part of corresponding closed curves lying to the right of the vertical plane defining a right half ellipse, large axes of respective half ellipses lying on inclined planes forming with said horizontal plane such an angle that intersection planes of the large axes with the corresponding half ellipses are above said horizontal plane.
Dependencies are inferred from the claim text.