DD267544A1 - CAR SPOTLIGHT WITH ELLIPSOID REFLECTOR FOR REMOTE AND DISTANCE LIGHT - Google Patents

Abstract

Automotive headlamps with ellipsoidal reflector for high and low beam, consisting of a filament bulb, an ellipsoidal reflector and a lens system, thereby solved that for the function of high beam, the required for the formation of the low beam aperture removed from the beam path and at the same time a correction plate between ellipsoidal reflector and Outside focal point is arranged. FIG. 1 best illustrates the invention. FIG. 1

Description

But this measure alone would not lead to a satisfactory high-beam bundle centered on the reference axis. The Reference axis is a straight line parallel to the direction of travel through the light source. The optical system, that is the location of the

optically effective components to each other, is inevitably designed to design a far-reaching low beam with optimal illumination of the measuring points R50 and R7S on the ECE screen that the lighting Gstärkemaximum of

Abblendlichtes between the measuring points R BO and R 75 comes to rest. As a result, the maximum of the resulting by removing the aperture high beam in this of the Reference axis have deviating direction. According to the invention, this oblique position of the high beam is achieved in that simultaneously with the removal of the diaphragm Correction plate between the ellipsoidal reflector and the outer focus of this reflector is placed. This correction plate

ict a wedge plate with a wedge angle changing over the width of the plate .

The wedge angle y is constant over the entire height of the plate, and directed so that the thickness of the correction plate in Light emission direction increases to the right and down increases. The refractive edge extends in the light emission direction

rotated about 30 ° clockwise against the vertical. The correction plate has a flat surface.

Through this correction plate is achieved that all coming from the reflector and its outer focus

extending light rays are deflected so that they meet in a nrbjn the optical axis lying point.

As a result, the light beam emitted by the projection lens is given a changed direction such that the light beam center

is radiated in the direction of the reference axis, if for the wedge angle in the direction perpendicular to the breaking edge

Cut the following conditions are met:

/ • = arctg- ^{nsin (a} '" ^P) β

^{1 8th} l-ncos (a'-ß)^p

' ^sina ' jo / 9L-tanö-y _M > a = arc sin --- and β = arctg (- -)

η = calculation index of the material of the correction plate

a = angle between reflector light beam and axis

g _L = focal distance to the flat surface of the lens

δ = angle by which the high beam is to be deflected

Vm = distance of the puncture point of the light beam on the lens facing side of the correction plate of the

optical axis in a section perpendicular to the refractive edge Z = distance of the piercing point of the light beam on the lens-facing side of the correction plate from the plane perpendicular to the optical axis through the focal point of the lens.

embodiment The invention is explained in more detail below using an exemplary embodiment:

Fig. 1: shows diagrammatically the embodiment in a section running at right angles to the refracting edge Fig. 2: shows diagrammatically the view from the front (opposite to the direction of light emission) Fig. 3: shows the section C-C through the correction plate.

That of the helix 1, which is in the inner focus F | of the ellipsoidal reflector (3), outgoing beams pass through the outer focus F, the reflector, which is also the focal point Fl of the projection lens (4). Since the diaphragm (6) is located outside the beam path, a high beam is emitted. This high beam is deflected by the correction plate (5) so that the light beam center is radiated in the direction of the reference axis (8). In this embodiment, the flat surface of the correction plate (5) in the middle between l.ichtaustrittsöffnung (2) and outer focal point F, is arranged. The second surface of the correction plate (5) closes at every point with its flat surface the hint! y * a. This results in the profile of this second surface shown schematically in Figure (3). The refractive edge of this correction plate (5) extends in the light emission direction rotated by 33 ° from the vertical. For the angle / "in every point of the section C-C dio formula applies

 The following parameters were selected:

η = 1.5

g _L = 39 mm

linear eccentricity of the reflector <3 = 41.7mm

Accordingly, using the formula, the following data is obtained for the non-planar surface of the correction plate: y _M (mm) χ Π

-15 6.0 -10 6.9 -5 10.0 0 12.4 5 9.4 10 3.3 15 0

If the headlamp should emit low beam, the diaphragm (6) must be introduced into the beam path, that their upper edge (7) in the focus F ₁ zuliegen comes. At the same time the correction plate (5) must be removed from the beam path. ^Λ

! μ In the example, the correction plate (5) is thereby in error? imposing position moves, that it is pivoted about its breaking edge around 90 °.

Claims (2)

1. Motor vehicle headlamps with ellipsoidal reflector for high and low beam with a filament incandescent lamp, characterized in that for the function of high beam, which required for the formation of the low beam aperture (6) removed from the beam path and at the same time a correction plate (5) between ellipsoidal reflector (3 ) whose outer focal point is arranged, the refractive edge of which is rotated in the light emission direction by about 30 ° clockwise against the vertical, the thickness increases seen in the light emission direction to the bottom right and their wedge angle is determined perpendicular to the breaking edge section determined by the following equation : f- aretn TSin (a'-ß) _ _ß
J-arc tan, _ _{n. co} ~ ^l _(a 'I _SS) ß with a '= aresin 1ψ * 1 and β = arctg ( 2. Motor vehicle headlamp with ellipsoidal reflector according to claim 1, characterized in that the correction plate (5) can be moved by 90 ° around its breaking edge around in its inoperative position. For this 2 pages drawings Field of application of the invention The invention relates to a motor vehicle headlamp with ellipsoidal reflector and a filament bulb for all types of motor vehicles. Characteristic of the known technical solutions Motor vehicle headlamps with ellipsoidal reflectors have become known with the following structure: a filament incandescent lamp is arranged in the inner focal point of an ellipsoidal reflector. In the vicinity of the outer focus of this ellipsoidal reflector, which coincides with the focal point of the subsequent projection lens, a shutter is arranged, which is allowed according to the intended shape of the light-dark boundary of the light beam. By imaging this aperture by means of the projection line, a light bundle with a very sharp cut-off line is created, which is not achievable with classic vehicle headlamps (parabolic reflectors). This very sharp cut-off point means: for the driving experience a far-reaching low beam with good perception conditions below the cut-off line and at the same time minimal glare of oncoming traffic because of the. Area above the cut-off line can be kept extremely dark. Because of the aperture in the outer focus of the ellipsoidal reflector, however, no high beam can be generated in this known ellipsoidal headlamps, so that separate high beam headlamps are needed on the vehicle. As a result, the already high cost of a headlamp system with ellipsoidal reflectors are still increased. Furthermore, a solution with ellipsoidal reflectors, which can radiate the high beam and low beam, known in which for the function of high beam required for the formation of the low beam aperture removed from the beam path and at the same time a wedge plate behind the Pi ojektionslinse is arranged. This solution has the disadvantage that the wedge plate must cover the entire projection lens. So it must be moved a behaviorally large component that claimed in its inoperative position space next to the projection lens. Object of the invention The aim of the invention is a motor vehicle headlamp with ellipsoidal reflector and a filament incandescent, which emits a far-reaching high beam in addition to a low beam with the known good photometric properties, and in which the required for forming the high beam component in its inoperative position no space outside of the optical axis parallel projection of the circumference of the projection lens claimed. Explanation of the essence of the invention In order to be able to emit a far-reaching high beam with a motor vehicle headlamp with ellipsoidal reflector and projection lens, it is necessary to remove the diaphragm arranged in the immediate vicinity of the outer focal point of the ellipsoidal reflector from the beam.