Wall-installed lighting equipment

Abstract

 A wall-installed lighting equipment comprising at least one light source (A), which is able to provide a light scattering, said light source (A) is positioned on a perimeter length (10) of a reflector (11) of the lighting equipment; in order to make the most of the direct light of the light source (A) and to make the most of the light that is reflected from the reflector (11) and in order to distribute the light in an efficient way along the exit routes, the lighting equipment, which is used for safety or emergency lighting, has a reflector (11) with a composite surface, whose profile consists of a broken line which includes vertical lines (S) and diagonal lines (T), said diagonal lines (T) joining the vertical lines (S) and having an inclination of between -20° and 60°, with respect to the perimeter length (10) on which the light source (A) is positioned.

Description

[0001] This invention relates to a wall-installed lighting equipment with a single light source (LED).

[0002] More specifically, the invention refers to a specific optical system, which is able to make the most of the emission of an LED light source in the typical installation of the safety or emergency lighting.

[0003] In particular, the equipment is provided for distributing the light in an optimal way along the exit routes, where, according to the european legislation, must be guaranteed 1 lux on the midline of the exit route and 0.5 lux in a central band that is equal to half the width of the exit route (2 meters); in addition, the italian legislation specifies an illumination of at least 2 lux to 1 meter in height from the floor pavement.

[0004] A proper lighting must ensure in the visual field a sufficiently and rationally distributed high luminance to allow the perception of important areas, as well as for details, and to reduce dazzling to a minimum.

[0005] In particular, the safety or emergency lighting equipments should ensure that their luminous flux is sufficiently intense and concentrated to make it possible to identify easily and quickly the exit routes, particularly in the event of danger.

[0006] Luminance is defined as the ratio between the luminous intensity of a light source in a given direction and the apparent surface of said light source seen from the same direction; the value of luminance depends on the illumination, on the characteristics of reflection of the surfaces and on the directions of lighting and of observation.

[0007] In view of said dependences, the luminance is extremely difficult to calculate and, in practice, in the plan of a lighting system, the illumination is usually taken into consideration.

[0008] The illumination in a point of a surface is defined as the ratio of the luminous flux which affects an element of the surface around the point and the area of said element; therefore, the illumination can be easily envisaged and measured (in lux, by means of a luxmeter or an illuminometer) and thus the illumination can be conveniently and simply used to address technical issues, such as the plan of a lighting system.

[0009] The performance of a lighting equipment and in particular of an emergency lamp can be usually assessed by imposing a given illumination on a work surface; said work surface is conventionally constituted by an horizontal plane, which is placed at a certain distance from the floor, and a direct illumination is created when the light reaches the work surface directly from the light source (at least 90% of the luminous flux), while, on the contrary, an indirect illumination is created when the light reaches the work surface after being reflected, even several times, from the walls and/or from the ceiling of a room (at least 90% of the luminous flux).

[0010] Of course, intermediate cases are frequent, in which the luminous flux reaches the work surface with direct and indirect illumination and with intermediate values of percentages with respect to those mentioned above.

[0011] Equipments for direct illumination are widely used for artificial lighting of buildings for civilian and industrial use, as well as a major source of light, both as a source of emergency or safety lighting.

[0012] Said equipments usually include an hollow body, in which a light source, such as a fluorescent tube, can be housed and connected to electrical terminals, in order to supply it; the body is closed through transparent protective screens, which are removable to allow access to the light source and to the electrical terminals.

[0013] However, at present, the known lighting equipments and particularly the known safety or emergency lighting equipments have a distribution of the illumination on the work surface which is not much uniform and which is substantially unhomogeneous, even considering the relative position taken by a observer with respect to the light source; moreover, the illumination is relatively concentrated and not much intense, so that it is not practically possible to obtain an acceptable compromise between the intensity of the luminous flux and the concentration of the luminous beam, which are two crucial parameters when an emergency situation takes place in civil and work environments and when said environments must be illuminated with fluorescent lamps.

[0014] A purpose of the present invention is therefore to overcome the disadvantages mentioned above and, in particular, to carry out a wall-installed lighting equipment, which is able to distribute the light in an optimal way along the exit routes, on the basis of the european regulations on the illumination of various areas along said exit routes.

[0015] Another purpose of the present invention is to carry out a wall-installed lighting equipment, which is able to give, in any case, a desired distribution of the illumination and an optimum efficiency of the optical system.

[0016] Another purpose of the present invention is to carry out a wall-installed lighting equipment, which has both an illuminating efficiency, as indicated earlier, and a pleasant aesthetical appearance.

[0017] These and other purposes according to the present invention are achieved by carrying out a wall-installed lighting equipment, according to the enclosed claim 1; further technical features are also contained in the dependent claims.

[0018] Advantageously, the lighting equipment according to the invention has a single light source (preferably a LED source), is a wall-installed lighting equipment and is designed to make the most of the direct light coming from the source and of the light that is reflected from the reflector, in order to obtain an ideal photometric solid, which is able to meet with european regulations on light distribution along the exit routes.

[0019] Practically, an optical system that can easily manage the emission of an LED light source that is typically used for safety or emergency lighting plants is described in the following.

[0020] Additional features and advantages of a wall-installed lighting equipment according to the present invention will be more evident from the following description of a preferred embodiment of the lighting equipment of the invention, with reference to the enclosed schematic drawings, in which:

• Figure 1 shows a top view of the reflector which is used in the wall-installed lighting equipment, according to the present invention;
• Figures 2 and 3 show perspective views of the reflector shown in Figure 1, according to the invention;
• Figure 4 schematically shows a perspective view of the reflector, shown in figures 1-3, which is used in the wall-installed lighting equipment, according to the invention;
• Figure 5 schematically shows a top view of the reflector, shown in figures 1-3, which is used in the wall-installed lighting equipment, according to the invention;
• Figure 6 schematically shows a polar diagram of the wall-installed lighting equipment, according to the present invention;
• Figures 7 and 8 schematically show a photometric solid of the wall-installed lighting equipment of the present invention.

[0021] With reference to the above-mentioned figures, the wall-installed lighting equipment of the present invention, uses, in particular, as a light source, a power LED A, which is placed centrally and on a perimeter length 10 of a shaped reflector 11 of the wall-installed lighting equipment (see in particular figs. 1-3).

[0022] The lighting equipment can be used as a safety or emergency lighting equipment and is provided for distributing the light in an optimal way along the exit routes, where, according to the european regulations, must be guaranteed 1 lux on the midline and 0.5 lux in a central band equal to half (1 meter) of the width of the exit route (2 meters); the lighting equipment is able to create an ideal photometric solid, making the most of the light directly coming from the light source (LED) and of the light which is reflected from the reflector 11.

[0023] As the emergency lighting equipment is wall-installed and since the installation height is equal to 2.5 meters and the distance from the wall P, where the maximum value of illumination is provided, is equal to 1 meter (the midline of the exit route), the light source A (LED) is oriented (line 12 in figure 4) for obtaining a beam of direct light with an angle α, relative to the horizontal line R, equal to 22° ± 10° (arctg (1/2, 5) .

[0024] This value of the angle α allows to get the maximum of illumination due to the direct light along the midline of the exit route.

[0025] Using a Lambertian source, the direct light is always distributed in such a way as to illuminate a central portion of the exit route, according to the current regulations (equal to half the width V of the exit route, as shown in figure 4).

[0026] Regarding the optimal management of the reflected light, the reflector 11 is designed to address the light beam emitted from the source A always in the central portion of the exit route (equal to half the width V of the exit route), according to the european regulations.

[0027] Thus, the maximum opening of the reflected beam (which is bounded by the outer radii 13 and 20 of fig. 4) is optimized by providing a profile of the reflector 11 with the F and N lines having angles, respectively, β=8° ± 10° and γ=53° ± 10°, relative to the wall P and to the horizontal lines R.

[0028] The other lines of the profile (indicated by B, C, D, E, G, H, I, L, M in figure 4) are optimized for homogeneously sending the light in an area which is delimited by the highest beam aperture (bounded by radii 13 and 20).

[0029] Lines B, C, D, E of the profile have, for example, a value of inclination, relative to the wall P, which is between 70° and 50°, while the lines G, H, I, L, M have a value of inclination, relative to the wall P, which is between 5° and -25°.

[0030] In order to distribute the light along the exit route or in order to divide the luminous flux, thus obtaining a large illuminated surface in the direction of the length of the exit route, it is possible to provide for a broken line, as the perimeter line of the reflector 11.

[0031] The broken line (which is shown in detail in Figure 5) consists of several vertical lines S (from a minimum of 2 lines), which are linked by diagonal lines T, connecting said vertical lines S; the diagonal lines T also have an inclination which is between -20° and 60°, relative to the base of the light source A.

[0032] In practice, a rectangular reflector is not used (for aesthetical reasons), but a geometry is provided by breaking the two vertical lines (indicated with J and K, respectively, in figure 5) of a rectangular reflector in different parts, as shown in figure 5.

[0033] The S vertical lines can optimally distribute the light emitted by the light source A, while T diagonal lines, connecting said vertical lines S, do not contribute to the distribution of the light.

[0034] Finally, a wall-installed lighting equipment, which is used, in particular, for the safety or emergency lighting and which includes a shaped reflector 11, as described above, allows to outline a lighted area, such as to convey the flow that is emitted from the light source A to a predetermined area (indicated by the european regulations), in order to obtain a maximum illumination on the midline of each exit route, so as to limit the illumination in a central portion which is equal to half the width of the exit route (2 meters) and to have a wide opening in the direction of the length of the exit route.

[0035] Thus, the light that is emitted from the LED source A is directed according to the user's needs, without spreading the light in areas where there is no need to have light.

[0036] It is thus observed that the wall-installed lighting equipment of the present invention is particularly useful as a safety or emergency lighting equipment because it gives an optimal distribution of light along the exit routes; moreover, the shaped perimeter of the reflector 11 of the lighting equipment allows to obtain an ideal photometric solid (shown in Figures 7 and 8) and an ideal polar diagram (Figure 6), in order to meet the european regulations regarding the illumination along the exit routes, making the most of the direct light of the LED light source A and the light that is reflected from the walls of the reflector 11.

[0037] Finally, it is clear that many other variations can be made to the wall-installed lighting equipment of the present invention, without departing from the novelty of the inventive idea, as it is clear that in the practical implementation of the invention, materials, shapes and sizes of the embodiments can be varied and can be replaced with others which are technically equivalent.

Claims

1. Wall-installed lighting equipment, which is usable as a safety or emergency lighting equipment, comprising at least one light source (A), which is able to spread the light and which is placed on at least one perimeter length (10) of at least one shaped reflector (11) of the lighting equipment, characterized in that said shaped reflector (11) has a composite surface and has a section consisting of a broken line, which includes a plurality of vertical lines (S), placed perpendicular to said perimeter length (10) where the light source (A) is placed, and a plurality of diagonal lines (T) connecting said vertical lines (S).

2. Lighting equipment as claimed in claim 1, characterized in that said diagonal lines (T) connecting said vertical lines (S) have an inclination between -20° and 60°, relative to the direction of said perimeter length (10) where the light source (A) is placed.

3. Lighting equipment as claimed in claim 1, characterized in that the equipment has a single light source (A), preferably an LED-type source.

4. Lighting equipment as claimed in claim 1, characterized in that said light source (A) is placed centrally with respect to said perimeter length (10) of the shaped reflector (11).

5. Lighting equipment as claimed in claim 1, characterized in that said shaped reflector (11) is shaped for distributing the light in an optimal way along the exit routes, in order to have, according to the european regulations, 1 lux on the midline and 0,5 lux in a central portion equal to half the width of the exit route.

6. Lighting equipment as claimed in claim 1, characterized in that said light source (A) is positioned (12) for giving a direct light beam at an angle (α) of 22°±10°, relative to an horizontal direction (R), which is parallel to the wall (P) on which the lighting equipment is installed.

7. Lighting equipment as claimed in claim 1, characterized in that said broken line of the section of said shaped reflector (11) includes two segments (N, F) having two angles (β, γ) , which are respectively equal to 8°±10° and 53°±10°, relative to the wall (P) where the lighting equipment is installed.

8. Lighting equipment as claimed in claim 1, characterized in that said broken line of the section of said shaped reflector (11) includes first segments (B, C, D, E), which have an inclination between 70° and 50°, relative to the wall (P) where the lighting equipment is installed.

9. Lighting equipment as claimed in claim 1,
characterized in that said broken line of the section of said shaped reflector (11) includes second segments (G, H, I, L, M), which have an inclination of between 5° and -25°, relative to the wall (P) where the lighting equipment is installed.

10. Lighting equipment as claimed in claim 1, characterized in that at least two vertical lines (S) are placed perpendicular to said perimeter length (10), where the light source (A) is placed.

11. Lighting equipment as claimed in claim 1, characterized in that the lighting equipment outlines a lighted area, such as to convey the light flow emitted by said light source (A) in a predetermined area, to obtain the maximum illumination on the midline of each exit route, to limit the illumination in a central portion equal to half the width of the exit route and to have a wide opening of the light beam in the direction of the length of the exit route.

Drawing