WO2011157597A1

WO2011157597A1 - Light signal

Info

Publication number: WO2011157597A1
Application number: PCT/EP2011/059389
Authority: WO
Inventors: Rudolf Temming
Original assignee: Siemens Aktiengesellschaft
Priority date: 2010-06-16
Filing date: 2011-06-07
Publication date: 2011-12-22
Also published as: DE102010024381A1

Abstract

The invention relates to a light signal, in particular for rail-bound transportation paths, having a light source (2) and an optical system (3) for displaying the signal term over a long range and a close range, which is at an angle with respect to the latter. In order to reduce phantom light without a significant adverse lighting effect there is provision that the optical system (3) has a light guide segment (8) for deflecting a component light beam into the close range.

Description

The invention relates to a light signal, in particular for rail-bound traffic routes, having a light source and an optical system for signal visualization in a long-range area and a proximity area angled relative thereto.

In principle, light signals serve as signal transmitters or

Symbol indicators, which by coloring and / or shaping a luminous surface, d. H. through the radiation characteristic, convey certain information. These are often safety-relevant information that must not be falsified visually or blended by extraneous light. The unwanted lighting up or falsification of a light spot by incident of ambient light, eg. B.

Sunlight or spotlight, is called

Phantom effect called. Due to the phantom effect, in extreme cases it can lead to a false display as a result

inadvertent illumination of a point of light or a

Color shift come. This is particularly disturbing

Effect on the use of LED devices as a light source, as LEDs can be excited by incident light to shine or in LED light sources often rear reflectors are used.

In addition to the known phantom generators, which in the

Configuration are predictable, z. B. low sun for signals in east-west orientation, also occur sporadically or unforeseen sources of phantoms, z. As vehicle or building floodlights, reflections on surfaces, eg. B. on

glazed fronts or snow covers, on. So can too a signal that should be phantom-proof due to the location, be phantom-prone.

The following explanations relate essentially to light signals for the representation of signal terms in rail-bound traffic routes, without the claimed subject-matter being restricted to this application.

In the case of railway signals, it must be ensured that the driver can always recognize this clearly when approaching the signal intended for him. In this case, different route geometries, d. H. Straight line, curves and / or height differences, are taken into account. In addition to the long-range representation is also a

Close-up representation of the signal required for the

Driver can detect the light signal even if he is directly in front of the signal. In doing so,

especially at light exit surfaces of the optical system, strong reflections occur, which contribute to the formation of

Light phantoms and ultimately lead to dangerous signal terms.

Figure 1 shows by way of a photograph a typical example of such a signal term falsification, where white signal lamps 1 appear to a viewer as if they were on, although they are not turned on.

In general, attempts are made to minimize the phantom effect by blinding, baring, avoiding east-west orientation or by repeating critical signals.

According to DE 101 07 256 AI and DE 29 20 962 C2 are to

Fighting the Phantom Effect Apertures are used to reduce the incidence of phantom light as much as possible To take angle of incidence. It must be accepted that the radiation characteristic can only be realized as a simple circular or elliptical spot. Usually, this spot is widened to the desired light distribution with the aid of a diffusing lens or lens. By refractions or diffractions incident phantom light rays at the

Lens or the lens, the light point, however, again susceptible to the phantom effect. Also commonly used are gray-colored cover glasses, which have a stray segment for the signal visualization in the near range, with the stray segment serving for light scattering in the near zone and counteracting its gray coloration or a separate gray filter to the phantom effect. With this combination of properties, namely light scattering and reduction of the phantom effect, but in a positive optics inevitably creates a compromise, which leads to the optical effective flanks of the scattering segment continues to occur significant light reflections, so that the phantom protective effect at least for the group of ground-level light signals , which radiate upwards in the near range, is not sufficient. A further disadvantage is that the light intensity by about 80%, d. H. is reduced to about 20% residual light intensity. As a result, a light source with a correspondingly high light intensity

required. This increases the heat development and ultimately reduces the life of the light source.

Especially with multi-colored light signals then the light intensity is possibly no longer sufficient. This, in turn, increases the costs, because for different requirements,

especially with regard to the light intensity, different

Variants for the optical system and possibly also for the suitable light source must be realized. The invention has for its object to provide a light signal of the generic type, in which an impairment of safety due to the phantom effect without significant loss of light is largely avoidable.

According to the invention the object is achieved in that the optical system has a light guide segment for deflecting a partial luminous flux in the vicinity. Scattering elements, the amplified phantom light reflections

and gray filters, which reduce the light intensity, are thus unnecessary. Instead, a correspondingly shaped optical fiber segment is used for the close-range representation of the signal concept. The required light output is significantly lower in the optical fiber version than in the conventional diffuser / gray filter variant. This also results in a lower

Heat development and consequently a longer life of the light source. The position of the illuminated area in the near-field display, for example, on the left side of

Track on a high light tower arranged light signal to the bottom right or in the right-hand arrangement to the bottom left, can be easily adjusted by rotation of the optical system or the entire light signal.

The light guide segment can also be integrated as a separate component in a conventional optical system.

Preferably, however, it is provided according to claim 2, that the light guide segment for Nahbereichsdarstellung part of a light guide, which is another

Has optical fiber segment for remote area display. In this way, results in a particularly simple optical system, which consists essentially of a compact

Fiber optic block exists. The invention will be explained in more detail with reference to figurative representations. FIG. 1 shows an example of a phantom effect with reference to FIG

Photography and

2 shows a light signal with a schematic side view

a light distribution in the near and far range and enlarged section of an optical system according to the invention.

The above-explained Figure 1 illustrates the

Phantom light problematic based on a photograph of a

Light signal.

FIG. 2 shows a light signal in which a light source 2 and an optical system 3 for horizontal light emission corresponding to an optical axis 4 for long-range display and a downwardly directed one

Light cone 5 is provided for Nahbereichsdarstellung. The light signal is located next to a railway track 6. It can be a light signal assembly on very high masts, d. H. with obliquely downward beam 5 for the

Near-range illumination, as illustrated in FIG. 2, but also a very low, close-to-ground mounting may be provided, so that in the vicinity a signal concept representation must take place obliquely upward. With this ground-level installation is the phantom danger because of the high probability that the line of sight of the driver with the

Sun angle almost matches, especially

pronounced. To effectively combat phantom light is the optical

System 3 with a light guide 7, which is a first

Has light guide segment 8 for Nahbereichsdarstellung and a second light guide segment 9 for long-range display, and equipped with a front lens 10. Both light guide segments 8 and 9, which are shown partially in section, can have almost vertical light exit surfaces 11 and 12, which are also very unfavorable

Phantom conditions can be taken only slightly from extraneous light, so that reflected phantom light could fade the signal to be visualized signal concept.

Claims

claims

1. Light signal, especially for rail-bound

Traffic routes, with a light source (2) and an optical system (3) for signal visualization in one

Long range and one opposite this angled

close range,

d a d u r c h e c e n c i n e s that

the optical system (3) a light guide segment (8) for

Deflection of a partial luminous flux in the vicinity has.

2. Light signal according to claim 1,

d a d u r c h e c e n c i n e s that

the light guide segment (8) is part of a light guide (7), which is another light guide segment (9) for

Has long range representation.