DE1075067B - Electric light bulb for vehicle headlights with a light-blocking screen for glare-free lighting - Google Patents

Description

GERMAN

kl. 4b 11/06

INTERNAT KL. F 21 C

PATENT OFFICE

D 13313 VIIIc / 4b

NOTICE DAY: OCTOBER 10, 1952

NOTICE
THE REGISTRATION
AND ISSUE DEK
LEGEND = FEBRUARY 11, 1960

It is well known that road traffic offers through in the dark due to the glare of the vehicle driver the headlights of oncoming vehicles pose a serious risk. This glare is with the so far used headlights so strong that it is impossible a few meters before the encounter, for example on the To distinguish between existing road obstacles and to recognize the boundaries of the lane.

This drawback is caused by the use of yellow light and two-filament incandescent lamps sought to mitigate, one of which results in a beam of light directed only towards the ground, that it is outside the optical focus of the headlight reflector. The usage of yellow light has the disadvantage that the luminosity of the headlight and consequently also the Visibility for the driver is considerably reduced.

The generation of a light beam directed only towards the ground is only imperfect, because it is difficult, if not impossible, to find a headlight and bulb setting, which results in real freedom from glare in all traffic situations. The position of the headlight axis is namely, both from the load distribution on the vehicle and from the course and profile the road is influenced in a frequently changing sense. So it turns out that a setting that with two the passengers occupying front seats is flawless, is no longer glare-free if further Passengers also occupy the rear seats if the rear trunk is loaded or the Fuel tank is full.

There is always a risk of glare, for example, at the apex of inclines and when the driver is driving of an oncoming vehicle at a short distance before the encounter turns on its lights High beam switches. That's why electric light bulbs are already available for vehicle headlights a mounted on the glass bulb, in the axial direction of the light emitted by the headlight Lying light-blocking screen provided, which is a glare from the filament of the lamp directly prevents outgoing light and via a reflective surface facing the filament that reflects the light it intercepts into the interior of the headlight. You also have headlight bulbs in addition to such a screen lying in the axial direction, one - or even more - further, provided with this non-contiguous light-blocking screen that extends to both Extends sides of an axial plane and on the one hand obliquely the exit of light from the headlight reduce or prevent upwards, on the other hand via one facing the filament of the lamp

Electric light bulb

for vehicle headlights

with light-blocking screen

for glare-free lighting

Applicant:
Raymond Henri Pierre Devaux, Paris,

and Ovidio Falaschi,
Martina di Massa (Italy)

Representative: Dr.-Ing. G. Eichenberg, patent attorney,
Düsseldorf, Cecilienallee 76

Claimed priority:

France October 12th, December 13th 1951
and May 29, 1952

Raymond Henri Pierre Devaux, Paris,
has been named as the inventor.

reflective surface should allow additional light to emerge from the headlight at an angle downwards.

The invention proceeds from such known electric fresheners Incandescent lamps for vehicle headlights and seeks to eliminate the disadvantages therein exist that on the one hand the one thrown back from the screen lying in the axial direction in the headlight he inner Light is focused and reflected preferably against the filament of the lamp and as a result, not only undesirably additionally heats the filament, but also on the axial one More or less strongly bundled light thrown back by the reflector to the outside can occur, and that on the other hand, the additional screen arranged below the filament does not affect the radiation of light to both sides. Just that sideways forward and in However, it is the light emitted from the headlights in the direction of the oncoming traffic causes dangerous dazzling of people approaching the vehicle.

The invention avoids these disadvantages of known electric light bulbs for vehicle headlights,

909 729/74

whose glass bulb with a lying in the axial direction of the light emitted by the headlight, a directed towards the filament reflective surface having a light-blocking screen and with at least another, not connected with the screen lying in the axial direction, from Incandescent lamp base and on both sides of an axial plane along the glass bulb extending light-blocking Screen is provided, in that the reflective surface of the screen lying in the axial direction against the light source is convex and the additional screen is parallel to the road on both sides Axial plane of the headlight extends so that the light emission of the light bulb near the vehicle is reduced at least on the side of the oncoming traffic.

The convex curvature of the reflective surface of the screen lying in the axial direction causes a All around even deflection of the light hitting it against the reflector, from which it spreads evenly outwards, while the lateral arrangement of the additional. Umbrella an effective weakening of the oblique forward in the direction of the oncoming traffic Near the vehicle emitted light results. The scattered light causes a noticeable brightening of the Lanes of their lateral boundary without dazzling for oncoming people.

The light-blocking screens can be outside or inside the glass bulb in a known manner lie; In the case of glass bulbs that are colored in their mass, the side screen can advantageously be used as a thickening be formed of the glass bulb.

The oncoming traffic can also be better illuminated Traffic away from the road side can be achieved that the side screen is provided with a coating that throws the light back into the interior of the headlight.

In the drawing is an embodiment of the incandescent lamp forming the subject of the invention shown, namely shows

1 is a perspective view of an incandescent lamp for headlights according to the invention,

FIG. 2 shows a section through this lamp along the line H-II in FIG. 1,

FIG. 3 shows a horizontal axial longitudinal section through the lamp according to FIG. 1.

As can be seen from the drawing, the bulb 2 of the incandescent lamp 1, which is made of transparent material that is slightly colored in the mass, for example glass, has two thicker points 3 on the sides, starting from the base and extending approximately to the level of the filament, opposite one another and 4, which are less translucent than the rest of the thin-walled part of the piston due to their greater wall thickness. These points 3 and 4 are symmetrical with respect to a horizontal axial plane and are partially provided with a firmly adhering opaque coating 5 and 6, respectively, which reflects the light into the interior of the bulb; the screen 7 lying in the axis of the lamp 1 is slightly concave towards the outside and correspondingly convexly curved towards the filament and also provided with an opaque, firmly adhering coating which reflects the light back to the interior of the lamp bulb. Around the section 7 is an elongated part of the bulb, which extends on both sides of the same axial plane as the bulges 3 and 4, also provided with an opaque, inwardly reflective coating each extending on both sides of a horizontal axis plane. As a result, light bundles are delimited between these thickenings, which after reflection result in an area of greatest brightness, which is elongated in the direction of the axis of the headlamp and radiated up and down on both sides of a vertical axis plane and that in a straight line direction

ίο illuminates part of the road in front of the vehicle, on which the car equipped with such a headlight moves. Against this is the brightness laterally next to this brightly illuminated area by the thickenings 3 and 4 and the opaque ones Coatings 5 and 6 are greatly reduced, but without a considerable loss of light as a whole occurs because the laterally shielded light is largely reflected into the interior of the lamp cap 2, where it is reflected back from sections 7 and 8 and through the reflector as scattered light to the outside occurs.

Of course, the light-blocking screens can be used instead of thickening the lamp bulb wall can also be produced by applying paint using a suitable technique. At a Motor vehicles can advantageously also be provided with the usual two headlights with lamps 1, whose pistons as a whole or whose shades have different colors, for example in the case of one The lamp is red and the other is green. In this way, contrasting lighting effects are achieved can be advantageous for the view and also reveal the position of a vehicle, especially also in the event that a headlight of this vehicle should have failed.

On the devices described and shown, in the context of. Invention manifold Modifications and improvements are made. In particular, a screen can be used in which certain places are more or less translucent or permeable, for example one made of plastic, the surface of which also has roughness of suitable shape to a to bring about more or less strong diffusion of the reflected light; these bodies can optionally also be colored.

Claims (3)

Patent claims: 1. Electric light bulb for vehicle headlights, the glass bulb with one in the axial direction of the light emitted by the headlamp, one directed against the filament reflective surface having light-blocking screen and with at least one further, is not connected to the screen in the axial direction and differs from the bulb base from both sides of an axial plane along the glass bulb extending light-blocking screen is provided, characterized in that the reflective surface of the lying in the axial direction The screen is convexly curved towards the light source and the screen emanating from the bulb base is parallel to the road on both sides Axial plane of the headlight extends so that the light emission of the light bulb near the vehicle is reduced at least on the side of the oncoming traffic. 2. Electric incandescent lamp according to claim 1, characterized in that the side screen as a thickening of the wall of the glass bulb colored in its mass is formed. 3. Electric incandescent lamp according to claim 1 or 2, characterized in that the side screen is provided with a covering that throws the light back into the interior of the lamp. Considered publications: German Patent Nos. 298 841, 299 171, 301, 478 325, 483 280, 505 873; Austrian Patent No. 171 620; Swiss Patent No. 233 034; French Patent Nos. 685 615, 766 557, 414, 1 002 854; U.S. Patent No. 1990666. 1 sheet of drawings © 905729/74 2.61 »