DE393459C - Airfield lighting - Google Patents

Description

Airfield lighting. The lighting of the runway of airfields has so far mainly been done either by special lanterns or by headlights. Beile 1H-ittel are not well suited for the now usual design Illumination of the actual landing area, as it either creates annoying shadows this form or light rays upwards. throw which the plane at The low-lying areas dazzle him and make it difficult for him to estimate his height above the ground.

The purpose of the invention is to avoid these evils and one such a distribution of the light rays of the lanterns to produce that the actual Landing runway well and shadowless lit @ is that the descending plane no dazzling rays hit, and that a light phenomenon over the airfield arises; by which the landing area is clearly marked as such.

An example of how to achieve these lighting effects is shown in the enclosed Drawing a lantern .shown, in Fig. I in a vertical section and in Fig. 2 in a partial top view of Fig. i. In Fig. I i is the fixed one Light emitting light source a slightly upwards from the focal point of a lens b thought arranged. The light falling on the lens at an angle a will condensed into a light bundle of less scattering ß through the lens and through the position of the light source above the focal point of the lens is slightly inclined downwards, whereby it is used to illuminate the actual landing strip. The above Lichtbünalle y radiating at the angle a serves to show the aircraft from above the To designate the position of the landing strip. This bundle of light becomes one for the distinction particularly distinguish it from other lights by showing it as a flashing light, which can be either white or colored. It also arises between the summarized Light bundle ß and the light bundle y a dark angle δ in which the flier is in a dark zone: where the eye can easily catch the lighting get used to the actual landing runway through the light beam ß hom going down can.

The light beam y radiating upwards can, also by optical means Means, be it through lenses or reflectors, are combined, whereby the dark angle d becomes larger and the intensity of the light beam y turns more intensely can.

Special darkening devices are used to generate the flashing light upwards, one of which is shown as an example in Figs. This is a circular disc composed of two movable diaphragms c and cl, which can be folded upwards like butterfly wings, so that in this position the light has almost free exit, while it is covered upwards with the diaphragms lying flat. The movement of these diaphragms can be brought about, for example, by the lever mechanism d and d 'and the rods e and ei. This lever mechanism is moved by a double lever fg, whereby g slides on a cam h. The drive of this cam disc can be assumed by any force, z. B. a clockwork. If several lanterns are used to delimit a landing strip or an airfield, it will be useful to let the light of all lanterns flash upwards at the same time, for which an electromagnetic control is particularly suitable, the power supply of which is automatically switched from a central point for all lanterns will.

Instead of the lantern shown as an example with a so-called Belt lens b as a light-collecting element can also be any headlight Construction with control elements to generate the collected light beam ß for the runway can be used. It is essential, however, that here, too, except the fixed bundle of light to illuminate the runway is a beam that shines upwards Flashing light is generated, and a dark zone is present between the two light bundles is.

In Fig. 3 and q. is the effect of the light distribution described with the use of four lanterns shown in elevation and plan.

The outer boundary rays of the light bundles ß form, when using a belt lens b, cone coats which hit the landing path in the arcs i and k. In the arrangement of z. B. four lanterns, as in Fig. D. shown, an area i is created, which (shown hatched in the drawing) receives an almost shadowless illumination.

The arriving aviator is therefore first in the bundle of rays y, which Show flashing light, get into the dark zone as you go down further d and finally be able to drop the plane on the runway l without being able to his eye is struck by the light from the bundle of rays ß.

Claims (2)

PATENT CLAIMS: i. Device for lighting the runway from airfields by lanterns, in which several, solid light emitting light sources are used, characterized in that the light rays are partly used for lighting the landing strip .by optical means 1-esammelt so that they are fixed beams result, the upper boundary zone below the usual eye level of the driver in Aircraft remains, in part as an upward beam of light emerging through Blackouts show flashing lights while one is between these two Light phenomena lying zone remains dark. 2. Device for lighting the Airfield landing strip according to claim i, characterized in that several Lanterns are used in such a way that their bundles of light are used for lighting the runway intersect while the upward beams of light can be darkened at the same time from a central point and thus coincident Show flashing light phenomena.