CN112997237A

CN112997237A - Emergency light

Info

Publication number: CN112997237A
Application number: CN201980030015.3A
Authority: CN
Inventors: 吉安·彼得罗·百家丽
Original assignee: Bakery Ltd
Current assignee: Bakery Ltd; Beghelli SpA
Priority date: 2018-05-15
Filing date: 2019-05-07
Publication date: 2021-06-18
Also published as: IT201800005395A1; WO2019220472A1; EP3794576A1

Abstract

An emergency lamp is described, comprising: a light source (10), preferably consisting of one or more LEDs; a lens (11) placed in front of the light source (10); a reflector (12) located to the side of the light source (10); and a transparent screen (13) arranged on the opposite side with respect to the light source (10) and placed so as to cover the emergency light, the lens (11) being designed so as to direct a first component (R) of the luminous flux emitted by the light source (10) to the reflector (12) and to send a second component (R1) of the luminous flux emitted by the light source (10) to at least one of the ends of the transparent screen (13).

Description

Emergency light

Technical Field

The present invention relates generally to an emergency light, in particular using one or more LEDs as light source.

More specifically, the invention relates to an LED emergency light designed to meet the standards required by the industry, in particular it is designed to meet the following main requirements:

mounting a typical emergency lighting system on a wall or ceiling;

-unifying pictograms for emergency signals;

concealing the light source in case the lamp is switched off.

Background

Proper emergency lighting must ensure illumination that is high enough and reasonably distributed across the field of view to allow perception of the area of interest. More specifically, the emergency light must ensure a sufficient luminous flux in order to easily and quickly identify the escape route, particularly in the case of a danger.

Brightness is defined as the ratio of the intensity of a light source in a given direction to the relative viewing surface viewed from the same direction.

Its value depends on the illumination, the reflective properties of the surface and the direction of illumination and observation.

The illuminance, relative to a point on the surface, is defined as the ratio of the luminous flux of a surface element striking around the point to the area of the element itself.

The illuminance can be easily planned and measured by means of a luminometer or a light meter, so it can be conveniently and simply used to solve technical problems, such as, for example, the design of lighting systems.

The performance of an emergency light is generally evaluated by imposing a certain illumination on a work surface, which conventionally consists of a horizontal plane at a certain distance from the ground.

Direct illumination may be referred to when light is directed from the light source to the work surface, while indirect illumination may be referred to when light is reflected from the walls and/or ceiling of a room, or even multiple reflections from the light source to the work surface.

Of course, the intermediate cases are very frequent, in which the luminous flux reaches the working surface in direct and indirect percentages having intermediate values related to the above.

By using an emergency lamp of a known type, it is not possible to obtain a combination between the following properties in the system: lamps for both wall-mounted and ceiling-mounted types, unification of pictogram displays employed for emergency signaling, and at the same time ensuring that the light source is hidden in the event of a light-off.

Disclosure of Invention

The object of the present invention is therefore to overcome the above-mentioned drawbacks by making an emergency lamp that meets the standards required by the industry, which in particular allows to fulfill the following main requirements: typical emergency lighting systems can be wall mounted and ceiling mounted, ensuring a complete and unified pictogram for emergency signaling, and hiding the light source when the light is off.

It is another object of the present invention to produce an emergency light that complies with current safety regulations.

A further object of the invention is to make an emergency light of relatively simple, safe and reliable construction, which makes use of substantially known techniques and relatively inexpensive components.

These and other objects according to the present invention are achieved by making an emergency lamp according to the appended claim 1.

Drawings

The features and advantages of the emergency lamp according to the invention will emerge more fully from the following description of a non-limiting example with reference to the accompanying schematic drawings, in which:

fig. 1 is a perspective view of a relatively preferred but non-limiting embodiment of an emergency lamp according to the invention;

fig. 2 is a longitudinal cross-sectional view of the emergency lamp of fig. 1 according to the invention;

FIG. 3 is an optical schematic relating to the diffusion of light from a light source to a screen in an emergency lamp according to the invention

Figures and partial views.

Detailed Description

With reference to the above figures, the emergency lamp according to the invention comprises: a light source 10, preferably consisting of one or more LEDs; a lens 11 placed in front of the light source 10; reflectors 12, which are located at the sides of the light source 10 and are substantially V-shaped and have two wings of a substantially spread V, wherein the light source 10 is mounted at the vertex of the V, said wings being specifically designed to form an obtuse angle between them; and a transparent screen 13 arranged on the opposite side with respect to the light source 10 and positioned to cover the emergency lamp together with a frame 14 surrounding the transparent screen 13 in the schematic view.

In order to meet the standards required by the industry, the lens 11 is designed to enable the light flux from the light source 10 to be redirected to the outside of the lamp, which meets the following main requirements:

the possibility of mounting the lamp on a wall or ceiling in a typical emergency lighting system;

obtaining the possibility of displaying a significant consistency of the pictogram for the emergency signal on the transparent screen 13;

the possibility of hiding the light source 10 in case the lamp is switched off.

In particular, advantageously, the lens 11 is preferably made of PMMA (or similar material with very high light transmittance) and its dimensions are preferably about 19 × 6 × 70mm (rescale to any size), which allows a first component of the luminous flux emitted by the light source 10 to be sent to the reflector 12 (direction of the rays R from the lens 11, as shown in fig. 3), thanks to an optical design exploiting the known physical principles of total internal reflection (rays R2 and R3 of fig. 3), and another component of the luminous flux emitted by the light source 10 (direction of the rays R1 from the lens 11, as shown in fig. 3) to at least one of the ends of the transparent screen 13.

In particular, the lens has a first curved surface or surface, preferably concave, for directing the component of the flux corresponding to the ray R2 appropriately onto a second surface (preferably convex), and is designed to form total internal reflection as much as possible and to generate a flux corresponding to the ray R3; finally, the flux will be redirected from the third surface, which is responsible for forming the flux components corresponding to rays R and R1.

This allows to obtain a suitable polar diagram whose peak of the luminous intensity allows to achieve the objectives specified by the standards for emergency signals, specified by the standards, and at the same time allows the area of the screen 13 remote from the lens 11 to be sufficiently illuminated to obtain a good identification of emergency signals both in wall-mounted and in overhead-mounted lamps.

Further, the lens 11 is designed such that the light beams entering and coming from the light source 10 are totally reflected inside thereof (rays are denoted by R2 and R3 in fig. 3).

In fact, the light beams coming from the light source 10 and entering the lens 11 do not escape from the above-mentioned lens 11, but are guided externally by the known physical principle of total internal reflection, so that the light source 10 is hidden by the lens 11 itself.

Also advantageously, the reflector 12 allows a portion of the luminous flux coming from the lens 11, which impinges on the reflector, to be recovered, thus improving the uniformity on the screen 13 compared to the solutions of the prior art.

More specifically, the inclination of the reflector 12 gradually approaches the screen 13, which is moved away from the lens 11 on both sides of the lens 11, so that a good illumination distribution is obtained at the end of the screen 13.

Also advantageously, the transparent screen 13 also improves the uniformity of the illumination, particularly in the areas remote from the lens 11.

In particular, the surface with respect to the screen 13 is very inclined and the rays coming from the lens 11 are partially emitted to the outside and partially reflected to the reflector 12, which returns a part of the luminous flux to the screen 13.

This enables a better uniformity of the illumination on the screen 13 to be achieved, since the uniformity of the illumination obtained by applying the identification pictogram of a typical emergency lighting has a value that is in accordance with the standard.

It has been found in practice that the emergency lamp according to the invention is particularly innovative and advantageous and achieves the preset aims by using in combination the lens 11, the reflector 12 and the screen 13.

The features of the emergency lamp according to the invention appear clearly from the description, as do its advantages.

Finally, it is clear that many other variants may be made to the emergency lamp in question, without thereby departing from the scope of the invention as expressed in the appended claims.

Claims

1. An emergency light comprising: a light source (10), preferably consisting of one or more LEDs; a lens (11) placed in front of the light source (10); a reflector (12) located to the side of the light source (10); and a transparent screen (13) arranged on the opposite side with respect to the light source (10) and placed so as to cover the emergency light; characterized in that the lens (11) is configured to: -directing a first component (R) of the luminous flux from the light source (10) to the reflector (12), and-directing a second component (R1) of the luminous flux emitted by the light source (10) to at least one of the ends of the transparent screen (13).

2. An emergency lamp according to claim 1, wherein the lens (11) is made of a highly light-transmissive material and is configured to: the first component (R) of the luminous flux is sent towards the reflector (12) due to total reflection inside the lens (11) of the rays of light corresponding to the third (R2) and fourth (R3) components of the luminous flux emitted from the light source (10).

3. Emergency light according to at least one of the preceding claims, characterized in that the lens (11) has a first concave surface configured to direct a third component (R2) of the luminous flux onto a second convex surface of the lens (11), the second convex surface being configured to provide total reflection of the luminous flux from the light source (10) within the lens (11) and to produce a fourth component (R3) of the luminous flux, the fourth component (R3) of the luminous flux being further redirected by means of a third surface of the lens (11), the third surface of the lens (11) being configured to produce the first and second components (R, R1) of the luminous flux.

4. Emergency light according to at least one of the preceding claims, characterized in that the reflector (12) has a substantially V-shaped configuration and two limbs of the V, wherein the light source (10) is mounted at the vertex of the V and the two limbs are configured to form an obtuse angle between the two limbs.

5. Emergency light according to at least one of the preceding claims, characterized in that the luminous flux from a light source (10) and entering the lens (11) is driven from the outside to the lens (11) such that the light source (10) is concealed by the lens (11).

6. Emergency light according to at least one of the preceding claims, characterized in that the reflector (13) is gradually inclined with respect to the surface of the transparent screen (13) on both sides of the lens (11).

7. Emergency light according to at least one of the preceding claims, characterized in that the transparent screen (13) is configured such that a first part of the luminous flux from the lens (11) is sent outside the lamp and a second part of the luminous flux from the lens (11) is reflected to the reflector (12), the reflector (12) being configured to send another part of the second part of the luminous flux back onto the transparent screen (13).