CS269110B1 - Headlight for motor vehicles - Google Patents

Abstract

The invention relates to a dipped-beam headlamp for motor vehicles, having a light source which has a filament, arranged axially above the optical axis of the headlamp, having a reflector (1), divided into an upper and a lower half by a plane containing the horizontal and the optical axis of the headlamp, which has sectors. The upper and the lower half of the reflector (1) is in each case subdivided by the planes containing the optical axis (x) of the headlamp into an upper or lower middle sector (15) or (16), into an upper or lower edge sector (11) or (14) located more closely to the centre of the roadway and into an upper or lower edge sector (13) or (12) located more closely to the edge of the roadway. The upper and lower central sectors (15) and (16) of the reflector (1) have a vertex angle (apex angle) of THETA </= 140@. The focal points (F11, F15) of at least two sectors (11, 15) of the upper half of the reflector (1) are located behind the rear end (21) of the light source (2). The focal points (F12, F16) of at least two sectors (12, 16) of the lower half of the reflector (1) are located, in the direction of travel, in front of the front end (22) of the light source (2). The axis of the rotational symmetry of the upper sector (11) located more closely to the middle of the roadway and/or the lower sector (12), located more closely to the edge of the roadway, of the reflector (1) is ... with respect to the optical axis (x) of the headlamp in the direction ... Original abstract incomplete. <IMAGE>

Description

BACKGROUND OF THE INVENTION The present invention relates to a headlight for motor vehicles which is intended to form a passing beam and / or a fog beam. This beam is characterized by a light-dark interface # which is linear and horizontal in the case of a passing beam of Z-shape and in the fog light.

A conventional way of creating a light-dark interface is to apply a screen below the axial filament of the bulb, which unlocks the bottom of the reflector. The disadvantage of this solution is the loss of almost half of the luminous flux emitted by the bulb. Normally, this interface is also formed by shifting the elementary representations of the transverse filament of the filament lamp by diopter elements of the refractor. The disadvantage here is the sharpness and low gradiend of this interface of light and darkness.

These drawbacks are eliminated in a headlamp according to the invention, comprising an axial light source positioned above the headlamp axis, wherein the reflector is horizontal with rotationally symmetrical segments, at least one of which is paraboloidal in shape, defined by the aperture and edge apertures of the reflector. and two planes extending the optical axis of the headlamp and forming an angle of less than 140 °, wherein the focal points of the segments in the upper half of the reflector are on the side of the light source nearer to the top aperture of the reflector; An additional feature of the invention is that the horizontal deviation of the light deviation is with a vertical wedge profile of certain zones.

The present invention may be practiced in various alternatives and will be described herein by way of example of a headlamp with reference to the accompanying drawings, in which Fig. 1 is a vertical section of the headlamp of the invention and Fig. 2 is a front view of a headlamp without refractor.

Fig. 1 shows a vertical sectional view of the headlamp AA, consisting of a reflector 1, a light source 2 ^{and a} refractor 3. The light source 2 is of cylindrical shape with a diameter d and is mounted axially approximately 0.5.d above the optical axis x of the headlight . FIG. 2 is a front view of a reflector provided with segments 11, 1, 2, 13, 14, 15, 16 of a rotationally symmetrical shape defined by a vertex 17 and an edge 18 of the reflector opening 1, a horizontal (x = 0) and two planes the optical axis x of the headlamp enclosing an angle θ:

e 140 ° ... (i), wherein the segments 11,13,15 in the upper half of the reflector 1 have smaller focal lengths than the segments 12,14,16 in the lower half of the reflector 1, so that their foci F1 ' ^F 13 * ^F 15 are ^on the face 21 of the light source 2, which is closer to the aperture of the reflector 17, while the focal points 22 ^{are on the strap} 22 of the light source 2 closer to the exit 18 of the reflector. 12, 13, 14, 15, 16 is of general shape or there is at least one segment, in particular one of the paraboloid-shaped segments 11, 12, to achieve the desired luminous flux concentration.

To create an asymmetric elevation of the light / dark boundary line on the side of the road's proximal edge, the axis of rotation symmetry of segment 11 and / or segment 12 is raised relative to the horizontal (y = 0) at an angle Ψ i where ψ = are tg (0,005> 0,04) (2) or the refractor 2 is ^{in a} homologous zone with a segment 11 and / or a segment 12 of a reflector 1 vertically wedge with a refractive angle base at the top of the headlamp where / = arctg (0.01 + 0.08)

•. · (2) ·

If the focus F4 and / or the focus _{14 of the} segment 13 and / or the reflector segment 14 lie in the light source 2, the Z-shaped light-dark interface is formed such that the angle Θ of the division planes is

Θ = 80 ° + 100 ° · (4)

Due to the considerable axial differences of the reflective surfaces of the reflector segments 2, it is made in one piece of thermoplastic or thermoreactive mass.

Claims (6)

Headlamp for motor vehicles, characterized in that the light source (2) is located axially above the optical axis (x) of the headlamp and the reflector (1) is provided with segments (11), 12.13.14.15.16) rotationally symmetrical in shape, defined by the aperture (17) and the peripheral (18) of the reflector (1), the horizontal (y = 0) and the two planes passing through the headlamp optical axis (x) and forming an angle (Θ) σ £ ΐ40 ° ... (i), wherein the foci (F, F) of the segments (11,13,15) in the upper half of the reflector (1) are on the face (21) of the light source (2) near the aperture (17) of the reflector (1) ) and the foci (Fy ₂ ' ^F 14' ^F 16 ^ segments (12,14,16) in the lower half of the reflector (I) are on the face (22) of the light source (2) nearer the exit opening (18) of the reflector (1) . Headlamp according to claim 1, characterized in that at least one segment (11, 12, 13, 14), 15.16) of the reflector (1) is of paraboloidal shape. Headlight according to Claims 1 and 2, characterized in that the axis of rotation symmetry of the segment (II) and / or the segment (12) of the reflector (1) is raised to an angle (ψ) with respect to the horizontal (y = 0). are tg (0.005 * 0.04) • · · (2) ♦ Headlight according to Claims 1 and 2, characterized in that the refractor (3) is homologous in its field with the segment (11) and / or the segment (12) of the reflector (1) vertically wedge with the base of the refractive angle ()). on the top of the headlamp where У = nrctg (0.01 + 0.00) (3). CS 269110 B1 3 Headlight according to Claims 1,2,3 and 4, characterized in that the angle (Θ) of the planes defining the central segments (15, 16) of the reflector (1) is 6 = 80 °: 100 · · · Headlight according to Claims 1, 2, 3, 4 and 5, characterized in that the reflector (1) is a one-piece thermoplastic or thermoreactive mass.