DE679700C - Device to avoid glare from headlights - Google Patents

Description

Device for avoiding the glare effect in headlights Die Idea to prevent glare in vehicle headlights polarized Light through a suitable eye protection from the eye of the oncoming one Be held by the driver. can use for remote lighting is not New.

The simplest type of their previously known designs, namely through. ordinary glass plate sets or by polarizing glass that is in its structure the tourmaline is modeled that: to polarize light coming from the headlight and to filter and only the polarized light beam exit the headlight to leave, appears because of the loss of light that necessarily occurs result in excessive heating of the headlight: not advantageous. D: ate, however, in addition to the long-distance lighting, also good floor lighting, by name in hazy weather and fog, which is of great importance to the driver beautiful. proved by the existence of the western widespread, additionally disordered Floor lighting spotlights.

Furthermore, designs are known that want to avoid this error and the non-polarisable portion of the headlight by appropriately positioned Throw mirrors down on the roadway and so for illuminating the floor seek to make usable in front of the vehicle. But they all have been known so far Designs have the disadvantage that, if they do, they achieve their purpose as completely as possible want way too complicated and too heavy around also too expensive to manufacture will.

The device described below belongs to the type in which both light bundles, both the polarized and the only weakly polarized, unhindered and without; make their separation anew on an opposite polarization element hit, can emerge from the headlight. You used according to the invention instead of the already known Konstrulztibnen, the blind-like: in the polarization angle to the headlight axis, set up glass plate sets as polarization elements, under warping on the special mirror in the previous versions. weak wedge-shaped glass plates, so that the separation or the divergence of the polarized and the not ingeegneter plane polarized light bundle in z contrast to before is achieved by prismatic action.

The often discussed question of whether the polarization in the Scheimverferlicht if it is more appropriate in a vertical or in a horizontal plane, nature does not further decided for the horizontal plane of polarization; .dem, since the front of the wet asphalt road reflected light from a coming in the opposite direction: a car in the horizontal plane is pol @ arismert, the driver must be able to work with a single normal polarizing Eye protection for both his eyes against the horizontally polarized headlights as well as against that sometimes particularly uncomfortable to protect light reflected from the wet road .. The The present construction is adjusted to this case. It is main intended as a headlight attachment, the, on. Place the final pane of glass is used in the existing headlight. The bilux masking used up to now can remain; However, stopping down is only necessary when driving over the top of a hill and in fog.

The device consists essentially of several slightly wedge-shaped glass plate sets c, which act simultaneously both as polarizers and separators, and a mirror d, which is only intended to use the upper remainder of the four rays polarized by the topmost glass plate set. The weakly prismatic glass plates. c and he mirror d are arranged in a known manner like blinds, but so that the coming from the headlight. Beams that are reflected from the rear side of the glass plates and polarized horizontally, or their entire width is captured by the front of the next higher glass plate or the upper mirror and horizontally again horizontally; directed forward. This arrangement eliminates blind spots and light slits that occurred in previously known constructions; avoided. The resulting slight curvature of the blinds: üeanordnun, g, the different sizes of the individual glass plates and the resulting projection towards the front cannot be avoided, but it does not interfere with the purpose and manufacture. The larger opening of the headlight caused by the upper mirror is not disadvantageous, but rather helps to reduce the dazzling effect; because with the same light intensity the glare effect is less, the larger the luminous surface is. The rays that are not horizontally polarized and the rays that are only partially polarized are let through unhindered by the glass plates, but are refracted by the prismatic middle part of the glass plate set in., A small angle downwards to the direction of the horizontally polarized rays and to illuminate the Lane used in front of the car. The loss of light with this arrangement is limited to a minimum, since the light rays are neither filtered nor absorbed, but only separated in the simplest possible way.

The direct ones that are not parallel to the headlight attachment Beams can be generated in a known manner through a concentric with the light source, spherical mirror diaphragm k intercepted and made usable again or by a lens can be directed parallel.

That a Blends.chutzeinrichtung of the type described above only then its purpose completely, but also completely fulfilled when the driver we meet or even pedestrian is able to see his eyes. by an appropriately polarizing one Eye protection, e.g. B. 2rs or 21 ', to be shielded, does not require any further discussion, since this is in the nature of the problem of glare protection by means of polani, sation.

Since the yield of horizontally polarized rays is greatest in the center of the headlight, a small modification of the front paraboloid can be advantageous for reasons of weight and material savings: through two vertical cuts f f the headlight paraboloid becomes larger in a middle one Part and two smaller lateral parts dismantled and reassembled confocal at a certain small angle; the attachment is now only attached in front of the middle part, so that it throws the downwardly separated, not horizontally polarized rays onto the same area of the roadway on which the side parts of the parabolic also cast their direct rays.

The light penetrating into the far is due to the fact that (in contrast to ordinary Scheimverfern) only a certain polarized portion of the total light is used for this, naturally less than with ordinary headlights, which Faber can safely compensate for by using stronger lamps, since the extensive polarization effect of the headlight attachment is also sufficient Effect of a correspondingly polarizing eye protection is guaranteed.

The advantages or the technical advances in the above Design compared to previously known devices are: The total light yield is bigger; the heating is less; the polarizing elements of the headlight attachment utilize all rays. of the headlights and leave no blind spots Light slits free; the polarization of the distant light is a result of it the double reflection on sets of plates is purer, which allows a purer polarization effect the use of more powerful lamps; the floor lighting in front of the car is much better; : the construction is much simpler and more natural, so the production is much cheaper, and the manufacturing price does not stand in the way of general introduction.

Claims (1)

PATnVTANSPRUCII: Device to avoid the glare effect of Scheüx projectors, Consists of a headlight attachment with several blinds in the polarization angle glass plate sets arranged to the headlight axis. and one to take advantage of the Residual light analog attached mirror, characterized in that instead of the plane-parallel Glass plate sets weakly wedge-shaped glass plates are used.