FI88010B - Navigation mark - Google Patents

Description

1 88010

This invention relates to a navigation sign for long distance detection.

Sea signs come in all sorts of implementations. Hake is a type of nautical sign that has recently been standardized in Sweden as a pyramid-shaped box with a height of about 1.5 meters. Some sea signs, such as hake, are illuminated at night to make them easier for sailors to notice.

The new chamomiles in Sweden are painted in a so-called day-fluorescent color, a color that emits visible light of a wavelength when ultraviolet light hits it. The idea is then that the ultraviolet portion of the incoming sunlight activates the fluorescent color so that a fluorescent effect is obtained, as a result of which the hake is easily detectable during the day. The usual hue of the fluorescent color used is red.

To make the chamomile visible at night, it is illuminated by an armature emitting a relatively white light, for example a halogen lamp.

However, such an illuminated hake is sufficiently visible. ; only about 1.5 miles away. When such a hake is approached at night, it happens that the naked eye sees more and more white in the light * 1 emitted by the hake, and thus less and less red light. At a distance of about 1.5 nautical miles, such a hake looks like a white lamp, roughly fixed street lighting, or some other white light. : seven from a light source.

The reason for this phenomenon is e.g. the fact that the light coming from the armature, which strikes the environment of the hake, illuminates an area considerably larger than the surface of the hake, while the open angle 88 2 0 filled by the hake, measured from the eye, is very small at a distance of 1.5 nautical miles. The light illuminating the environment is thus reflected and prevails at this distance from the light reflected from the strange.

In practice, this makes it impossible for the naked eye to distinguish an illuminated hake from street light, the exterior light of a house, or similar light sources at a distance of more than about 1.5 nautical miles. A prerequisite for recognizing a hake at a greater distance with the naked eye is therefore to know the bearing of that hake.

This is very unsatisfactory, because the idea of using sea signs is that a sea sign can be identified instead, so that e.g. due to the direction of the nautical sign to decide where we are.

On driveways with a large population and other fixed sources of lighting, it is almost impossible to detect an illuminated hake at a distance of about 1.5 nautical miles.

The present invention completely solves the above problem.

The present invention therefore relates to a navigation sign having a • #; characterized in that it consists of a nautical mark of a type known per se, comprising one or more surfaces at an angle to the horizontal, said surfaces being provided with a fluorescent color which, when illuminated by ultraviolet light, emits light of visible wavelength, is illuminated , which contains a large proportion of ultraviolet. : light, and that the light source of the lighting device, possibly in combination with a cover glass, is arranged not to emit ..li 'light in the region of the visible light spectrum.

3,88010

The invention is illustrated in part in the following drawing in connection with an exemplary nautical sign, in which drawing Figure 1 shows a side view of a hake Figure 2 shows a top view of the front view of Figure 1.

Figure 1 shows the Chamomile 1 seen from the side, i.e. in the way the sailor sees it. Figure 2 shows chamomile 1 seen from above.

According to a preferred embodiment, a hammock 1 is used, which comprises a pyramid with a square cross-section in the horizontal plane, as shown in Fig. 2. The chamomile suitably comprises three plates 2, 3, 4, each of which consists of a plate. Each of the plates can be an equilateral triangle with a side of 1.80 meters. This structure is used in the case where the side 5 without the plate is directed inwards towards the ground. The hake can, of course, be built to comprise two or four plates.

The outer surface of said plates 2, 3, 4 is provided with a color which, when irradiated with ultraviolet light, fluoresces and emits light having a wavelength within the limits of the visible spectrum, i.e. a so-called fluorescent color. Preferably, the color is selected:: so that it sends a visible · / · in the red area; light irradiated with ultraviolet light.

The lighting device 6, 7, 8 is adapted to emit ultraviolet light. The lighting device comprises, for example, two arm-. . lanes 7, 8, each of which has a light source formed by a mercury lamp. Preferably, the lighting device is made to emit light having a wavelength in the range of 360 nanometers to 370 nanometers.

According to a preferred embodiment, the lighting device is made; 'such that the lighting device, possibly in combination with an amiuatmir 4 88010 cover glass, does not emit any light in the region of the visible light spectrum. As a result, no part of the environment becomes illuminated in a way that is visible to the naked eye.

The fittings 7, 8 are suitably supported by a stand 6 and are mounted so that their light apertures are directed to illuminate all sides 2, 3, 4 of the hammock. In this case, it is of course advantageous if the fittings are shaped so that essentially all transmitted light falls in the dashed sectors in Figure 1. , because ultraviolet light outside the chamomile is useless.

The sea sign of the present invention is much more visible at dark times of the day compared to a white-illuminated hake.

Practical experiments have shown that when illuminating a hake according to the invention, the dimensions of which are given above, with two 125 W fittings emitting ultraviolet light, only a strong red light is visible even at distances up to about 5 nautical miles.

Since the environment is not illuminated in a way that is visible to the naked eye, only the Hake is visible in bright red. Not only is the two ·. · _ Li visible at a distance of up to 4 times longer than that illuminated by visible light, it is very easily distinguishable from the rest of the fixed lighting on the ground.

The nautical mark according to the present invention thus represents a considerable improvement for seafarers.

Hammel is given as an example above. However, other appearance and quality sea signs may be used for the present purpose.

8801 0

Thus, the present invention cannot be considered to be limited to the embodiments set forth above, but may vary within the scope of the appended claims.

Claims (3)

6 88010 A navigation sign for long-range detection, characterized in that the navigation sign consists of a nautical sign of a type known per se, comprising one or more surfaces at an angle to the horizontal, said surfaces (2, 3, 4) being provided with a fluorescent color which is illuminated ultraviolet light emits light of visible wavelength, that the lighting device (7, 8) is adapted to illuminate said surfaces (2, 3, 4) with light containing a large proportion of ultraviolet light, and that the light source of the lighting device (7, 8), possibly in combination with a cover glass, is arranged not to emit light in the region of the visible light spectrum. A nautical sign according to claim 1, characterized in that said surfaces (2, 3, 4) are provided in a known manner with a color which, when stored with ultraviolet light, emits a visible wavelength in the red region, and that the lighting device (7, 8) is adapted to emit light the wavelength is about 360 nanometers to 370 nanometers. Sea sign according to Claim 1 or 2, characterized in that the sea sign is formed by a Chamomile (1) which comprises a pyramid of horizontal cross-section in the horizontal plane.