CZ74292A3 - headlight - Google Patents

Description

The invention relates to a headlamp for reversing vehicles

BACKGROUND OF THE INVENTION

The prior art headlamps use belt refractive elements which have linear scattering characteristics and do not perfectly cover the entire working area. Cushion scattering elements having uniform scattering characteristics over the entire surface of the refractor are also applied. In this arrangement, the sides of the light beam have a relatively high intensity compared to the intensity in the direction of the headlamp axis, which reduces the visual comfort of the viewer.

withdrawal of the invention

These drawbacks are overcome with a headlamp according to the invention, comprising a paraboloidal reflector, a light source and a refractor having at least three concentric scattering zones of honeycomb lenses. The radius of these honeycomb lenses is different in the zones so that it increases from the center of the refractor to its edges. The central zone of the honeycomb lens creates a maximum wide beam of deviations of the light directed by the reflector and at the same time directs the light coming directly from the light source to the headlight workspace. The high deviation of honeycomb lenses in the central zone reduces the brightness of the light source and improves the light output uniformity of the luminous distribution here., The middle zone of the honeycomb lens creates a medium-wide light image and the edge zone concentrates the light beam near the headlamp axis. With this arrangement, an optimum spatial distribution of the headlamp is achieved:

xi mm axis and with ss.

decrease of luminance by * ,.

1; o Israel's image.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows the headlight in a front view, FIG. 2 shows the headlight in vertical section: A-No, FIG. 3 shows a section 3-3 of a honeycomb lens, and FIG. is a detail C of this honeycomb lens.

DETAILED DESCRIPTION OF THE INVENTION

Referring to FIG. 1, a reflector 3 of a headlamp having honeycomb lenses 31 is shown. These lenses 31 are in this example divided into three scattering zones, of which the central zone has a horizontal dimension = (0.8 4 2). F

... (1) where f - focal length of reflector 1 middle zone has horizontal dimension H?

K _? = (2 3 4). F

... (3)

Fig. 2 is a vertical section A-A of a headlamp composed of a reflector 1, a light source 2 which is housed in the focus F of the reflector 1, and a refractor 3 which is provided with honeycomb lenses 31 ♦.

Fig. 3 is a sectional view 3-3 of a honeycomb lens 31 having a spherical refractive surface whose radius in the central dispersion zone is = (0.58 0,7 0.75). T

... (2) in the central dispersion zone this radius P _{9 is}

V = (0.75 4 1.15)

... (4) and the remaining honeycomb lenses 31 have a radius R

R _x = (1.15? 5). T

... (5)

Fig. 4 shows a detail G of a honeycomb lens 31 whose width T is

T = (0.05? 5). F

... (6) thereby achieving the optimum number of honeycomb lenses 31 required for uniformity of the integral perception of brightness of the illuminating surface of the headlight according to the invention.

Industrial applicability

The headlight according to the invention can be used, for example, as a reversing or worklight for motor vehicles.

Claims (2)

... (1) where f - the focal length of the reflector (1) and the radius of the sphere (R ^) of the honeycomb lenses (31) is = (0,58 4 0,75). T ... (2) where T - width of honeycomb lenses (31) the central dispersion zone has a horizontal dimension (i ^) H ₂ = (2-4). F ... (3) and honeycomb lens radius (i ^) (31) R ₂ = (0.75 4 1.15). T ... (4) and the remaining honeycomb lenses (31) have a sphere radius (R) R _x = (1.15 t 5). T ... (5) Headlamp, in particular for motor vehicles, comprising a reflector, a light source and a refractor, characterized in that a filament (21) of the light source (2) and a refractor (3) are arranged in the focus (?) Of the paraboloidal reflector (1). provided with honeycomb lenses (31) arranged in at least three concentric scattering zones, the central scattering zone having a horizontal dimension (H ^) Η _χ = (0.8 4 2). F Headlamp according to claim 1, characterized in that the width (T) of the honeycomb lens (31) of the refractor (3) is T = (0.05 4 0.5). f o · ·