EP2647903B1 - Lens element in particular for an emergency lighting module - Google Patents

Description

The present invention relates to an emergency light module and a lens element for such an emergency light module, as well as for other lights.

For lighting escape routes in buildings or vehicles emergency lighting are known, which are switched in particular in case of failure of the normal lighting. To indicate an escape route is often desirable for such emergency lighting systems to distribute the light along one direction, namely the direction of the escape route.

Furthermore, it is known to provide additional light sources, in particular for emergency lights, in the form of LEDs.

From the EP 1 255 132 A1 a lens for a light emitting diode is known, which serves to deflect the light of the light emitting diodes in a circle symmetry about an optical axis laterally. For this purpose, the lens element on the opposite side of the LED has a funnel-shaped depression in order to deflect the light of the LED completely laterally by total reflection. However, this arrangement is usable only for a light distribution around the optical axis of the lens element.

US 2006/0274547 A1 discloses a lighting device for a rear light module. A plurality of lens bodies are disposed over a series of LEDs. The lens body are rectangular in cross-section and have a V-shaped cutout on the light exit side.

US 2006/0081863 A1 discloses a bipolar side emitting LED lens. The lens has a hemispherical base portion on which are disposed two wing members defining a V-shaped linear notch. The wing elements have inner sides where light from an LED is reflected to deflect it laterally.

US 2011/0141734 A1 discloses lenses which produce a batwing-shaped light distribution. The lens body may be rod-shaped, wherein on a side opposite to the light source side a wave-shaped incision is provided, on which light is deflected laterally. In an alternative embodiment, a cylindrically symmetric geometry with a funnel-shaped depression is disclosed.

US 2006/0091429 A1 discloses lenses for light emitting diodes. The lenses of the light-emitting diodes are cylindrically symmetrical and have a funnel-shaped depression on which light can be totally reflected on the inside.

WO 2011/010535 A1 discloses an LED lighting module having a lens element. The lens element is cylindrically symmetrical with a funnel-shaped depression.

The object of the present invention is to provide an optical system which generates in the simplest possible way the desired light distribution for an emergency lighting system or for other lighting systems, in particular for luminaires extending in one direction.

The object is achieved by a lens element according to claim 1.

The aforesaid lens element produces a broadened light distribution of the approximately point light source by the combination of total reflection at the V-shaped notch and the simple refraction of light, i. without total reflection, at the light exit sides of the lens element. The total reflection at the V-shaped notch provides for lateral deflection, i. away from the optical axis of the lens element. As a result, the light distribution is widely distributed. The linear extent of the incision further ensures that the light distribution does not expand uniformly in all directions, but spreads along one direction, namely transversely to the longitudinal extent of the incision. Due to the simple refraction without total reflection in the light exit surfaces, the light is coupled out transversely to the longitudinal extension of the incision from the lens element. Due to the difference in angle between the respective limb of the V and the light exit surface, the light can be diffracted over the path to be illuminated, i.e. by the simple refraction at the light exit surface. along the direction perpendicular to the longitudinal extent of the V-shaped notch distributed.

Since the lens element completely eliminates mirrored reflector surfaces, it can be inexpensively made of a transparent plastic, e.g. PMMA, manufacture. It is preferred that the lens element is made in one piece. Further, it can be made very small for each single LED (e.g., having a cross-sectional diameter of less than 35 mm).

According to a preferred embodiment of the invention, the lens element is circular or ellipsoid in a section perpendicular to an optical axis of the light entry surface and in the plane along which the V-shaped notch extends. This shape is adapted to the geometry of the punctiform light source, so that almost all the light of the point-shaped light can be used for deflection into the desired longitudinally extending light distribution. The light exit surfaces each extend over a partial circumference of the circle or the ellipse, whereby further a refraction of light in the direction to be illuminated, ie perpendicular to the longitudinal extent of the incision, takes place. Furthermore, the circular or elliptical shape is favorable for very small designs of the lens element. A comparable optics, which has reflection surfaces, would take up much more space.

According to a preferred embodiment, the light entry surface along at least one axis, preferably parallel to the longitudinal extent of the incision, convexly curved. Due to the convex curvature, a light bundling along the at least one axis is achieved. As a result, the proportion of the light which impinges on the V-shaped legs and thus is available for generating the desired light distribution can be increased.

According to a preferred embodiment, the legs of the V are arranged mirror-symmetrically with respect to a sectional plane through the longitudinal extent of the incision and through the punctiform light source. As a result, a mirror-symmetrical light distribution along the escape route to be illuminated can be generated. For special cases, asymmetric distributions according to embodiments of the invention are also possible. In this case, the V-shaped notch may be asymmetrical, i. be formed with two different angles of the V-shaped legs with respect to the light entry surface. Such an application is e.g. for an emergency light module at a location located at the end of the escape route (e.g., on the wall).

According to one aspect of the invention, parts of the two sections of the light-guiding body are arranged next to the incision with respect to the light entry surface such that a portion of the light entering through the light entry surface leaves the light guide body adjacent to the incision without prior total reflection at one of the V-legs. This portion of the light serves to illuminate the space near the emergency light, i. closer to the optical axis. However, since only a minor portion of the light near the emergency light is needed to produce a constant illuminance on the elongated surface to be illuminated, preferably the portion of the light leaving the lens body without total reflection at the V-legs is smaller ( eg less than 30%) as the fraction of light that leaves the lens element after total reflection at the V-legs.

According to a preferred embodiment, locking feet are integrally formed on the light-guiding body on the side facing the light source, for example in the region or next to the light-entry surface. Preferably, two or more than two locking feet, which are arranged symmetrically on a circumference provided. With the locking feet, the lens element can be attached to the emergency light module.

However, according to alternative embodiments, it is also possible for the lens element to be connected directly to the light source, e.g. by gluing with a transparent adhesive or by a socket (e.g., screw socket).

One aspect of the present invention relates to an emergency light module with an approximately punctiform light source, in particular a single LED, and a single lens element, which is associated with the individual LED, according to one of the aforementioned embodiments.

As an emergency light module, in particular an insert in a luminaire is referred to in this context, which can be fixedly connected to the luminaire. However, the emergency lighting modules can also be installed outside of luminaires, e.g. be integrated in a vehicle or room ceiling.

According to a preferred embodiment, the lens element is arranged centrally above the light source in the emergency light module. As a result, almost all light of the light source can be used to form a symmetrical light distribution. The lens element is, apart from any asymmetrically arranged locking feet, preferably formed mirror-symmetrical, wherein the plane of symmetry intersects the point light source and contains the degree of V-shaped notch. The lens body is also mirror-symmetrical with respect to a sectional plane perpendicular to the linear extent of the incision.

According to a preferred embodiment, the lens element can be mounted in different positions above the light source. For this purpose, for example, several depressions in the emergency light module for receiving the locking feet of an embodiment of the lens element may be present. The locking feet can be optionally engaged in different recesses. In this way, the direction of the longitudinally extending light distribution of the emergency light module can still be changed during the assembly of the lens element. For example, more cutouts are provided as locking feet, and a subset of the wells has angular intervals corresponding to the angular distances of the locking feet. For example, two locking feet can be provided at an angular distance of 180 ° and four, six or eight cutouts with angular intervals of 90 °, 60 ° or 45 ° be present on a corresponding circle diameter of the emergency light module. It is also possible to provide three locking feet on the lens element and to provide on the emergency light module nx 3 cutouts. Likewise, more locking feet may be provided as cutouts, of which optionally only a subgroup intervene in the cutouts of the emergency light module. It is also conceivable to provide a continuous groove along the circumference of the emergency light module, in which engage the locking feet of the lens element, whereby any Drehausrichtung the V-shaped notch about the optical axis of the lens element is possible.

According to a preferred embodiment fastening means are provided on the emergency light module, which are adapted to enter into a detachable connection with a lamp or another part of the building or vehicle component. For example, a cutout can be provided on the luminaire, or on the building or vehicle, in which latching elements of the emergency light module intervene.

The lens element of the present invention may serve not only to broaden the light distribution of a single approximately punk light source, but may also be configured to broaden the light distribution of a plurality of point light sources arranged in particular in a row. For this purpose, according to a preferred embodiment, a lens element is provided, in which the transparent light-guiding body along the direction of the linear V-shaped notch has a length which is greater than the width of the light-guiding body perpendicular to the linear V-shaped notch, for widening a light distribution of several approximately point-shaped light sources, in particular a plurality of LEDs, which are arranged in a row along the V-shaped notch. For example, the light-guiding element may have a length of at least 10 cm, preferably at least 30 cm. This lens element can be arranged via a series of a plurality of point-shaped light sources, which are arranged eg at regular intervals one behind the other, for example along a straight line. The lens element acts as previously described for each of the approximately point-shaped light sources to broaden the light distribution. Such lens elements can be used as emergency lighting systems, for example, to illuminate an escape route. However, the lens element can also be used for other lighting systems, in particular for elongated lighting systems, which are used for example for lighting goods in a refrigerator. In particular, the use of a series of LEDs is preferred because they have a particularly low energy consumption and generate less heat than comparable conventional light sources.

According to a preferred embodiment, the lens element has a constant cross-section over the length of the V-shaped notch. As a result, the same light distribution is generated along the lens element in cross-section perpendicular to the V-shaped notch.

According to a preferred embodiment, the locking feet of the lens element are arranged as continuous elements to one or both sides of the light entry surface parallel to the direction of the linear V-shaped notch. This embodiment is particularly suitable for the lens elements with longitudinal extension, because the arrangement of the lens element is fixed in the direction of the row of point-shaped light sources. The locking feet can take over tasks for the design of the light distribution according to a preferred embodiment. According to a preferred embodiment it is provided that the locking feet are formed of no clear transparent material and in particular of a light-scattering, light-reflecting and / or light-absorbing material are formed. As a result, the light distribution can be influenced transversely to the longitudinal extent of the V-shaped notch. In particular, the luminance in the angular regions can be bounded laterally by the point-shaped light sources arranged in a row.

The lens element may be integrally formed of a co-extruded material. In particular, various plastic materials, e.g. for lateral locking feet and for the clear transparent material of the light guide body, be used in one piece by co-extrusion to form the lens element. The light-guiding body can also be designed to be (weakly) light-scattering in the material or on the surface.

The invention further relates to a luminaire having a longitudinally extending lens element. According to one embodiment, the luminaire has a carrier element, preferably made of aluminum, to which the lens element is connected and which has at least one row of punctiform light sources, in particular a row of LEDs, opposite the light entry surface. Such a luminaire may also be used to illuminate objects or surfaces, e.g. within a merchandise presentation device, e.g. a refrigerator, are used.

According to a preferred embodiment of the luminaire, the carrier element has a detent spring on an opposite side of the lens element, wherein the detent spring a or more, preferably opposite, locking legs, which are adapted for locking with the carrier element. Preferably, the fastening means of the lamp are mounted exclusively on the detent spring, so that can be removed without disassembly of the detent spring, the carrier element optionally with the lens element of the detent spring. The detent spring, which is screwed on, for example, does not have to be removed and can be used again for a replacement light if necessary.

According to a preferred embodiment, the latching connection extends over the entire length of the lamp or there are provided a plurality of detent springs which are distributed over the length of the lamp. As a result, a uniform attachment of the lamp is possible.

At the end faces of an embodiment of the lamp cover elements may be provided which are positively connected to the carrier element and / or the lens element.

According to a preferred embodiment, the lens element is inserted lengthwise into a receptacle of the carrier body and held in a form-fitting manner therein. According to an alternative embodiment, the lens element may also be held in the carrier element by means of a latching connection.

Figur 1

zeigt ein Notlichtmodul in perspektivischer Darstellung.

Figur 2

zeigt das Notlichtmodul nach Figur 1 in Explosionsansicht.

Figur 3

zeigt ein Linsenelement in perspektivischer Darstellung.

Figur 4

zeigt das Linsenelement nach Figur 3 in einer Seitenansicht.

Figur 5

zeigt das Linsenelement nach Figur 3 in einer gegenüber der Figur 4 um 90° gedrehten Seitenansicht.

Figur 6

zeigt eine Seitenansicht eines Linsenelements einer alternativen Ausführungsform in Seitenansicht mit eingezeichneten Lichtstrahlen.

Figuren 7a und 7b

zeigen die Lichtverteilung eines Notlichtmoduls mit Linsenelement in einem vertikalen Schnitt durch das Modul bzw. in einer horizontalen Aufsicht auf eine zu beleuchtende Fläche unter dem Modul.

Figur 8

zeigt einen Querschnitt einer Leuchte gemäß einer alternativen Ausführungsform.

Figur 9

zeigt einen Querschnitt einer Leuchte gemäß einer weiteren Ausführungsform.

Other features and advantages of the present invention will become apparent from the following description of a preferred embodiment taken in conjunction with the accompanying drawings. The figures show the following:

FIG. 1

shows an emergency light module in perspective view.

FIG. 2

shows the emergency light module after FIG. 1 in exploded view.

FIG. 3

shows a lens element in perspective view.

FIG. 4

shows the lens element after FIG. 3 in a side view.

FIG. 5

shows the lens element after FIG. 3 in one opposite the FIG. 4 90 ° rotated side view.

FIG. 6

shows a side view of a lens element of an alternative embodiment in side view with drawn light beams.

FIGS. 7a and 7b

show the light distribution of an emergency light module with lens element in a vertical section through the module or in a horizontal plan view of a surface to be illuminated under the module.

FIG. 8

shows a cross section of a lamp according to an alternative embodiment.

FIG. 9

shows a cross section of a lamp according to another embodiment.

Referring to the Figures 1 and 2 a complete emergency light module 2 according to a first embodiment of the invention is shown. The emergency light module 2 has a housing which is composed of a housing lower part 4 and a housing upper part 6, which are connected to one another by a plug connection. In the housing is a circuit board 8, on which an LED 10 is arranged. Electrical contact terminals 12 are connected via the circuit boards for power supply to the LED 10.

Below the LED 10, a lens element according to the present invention is attached to the housing lower part 4. The lens element is in a first embodiment as a single element in the FIGS. 3 to 5 shown and in a second embodiment in FIG. 6 shown.

The lens element is made in one piece from a transparent plastic. It comprises an approximately round lens body 20 on which, preferably integrally, latching feet 21 are formed.

The lens body 20 has, on the side facing the LED 10, a light entry surface 22 which is convexly curved along an axis.

On the light entry surface 22 opposite side of the lens body 20, a V-shaped notch 24 is provided. The V-shaped notch 24 extends over the entire diameter of the lens body 20. The function of the V-shaped portion is, for example, in FIG FIG. 6 To recognize by the drawn beam path. That of the point light source (in the FIG. 6 above without reference numeral) outgoing light enters the lens body 20 through the light entry surface 22 and, after refraction at the light entrance surface 22, partially encounters the legs of the V-shaped notch 24 at an angle greater than the refraction angle of the total reflection. Due to the total reflection, the light radiation is deflected transversely to the longitudinal extent of the V-shaped notch and exits laterally from the lens body 20 at light exit surfaces 26. As a result, the lens body 20 generates a light distribution that is significantly widened compared to the incoming light beam of the point light source. Furthermore, it is achieved by the linear extension of the V-shaped notch that the broadening of the light distribution takes place substantially only perpendicular to the linear extension of the notch. As a result, the broadening of the light distribution is expanded only in one direction (perpendicular to the linear extent of the incision). The result of the light distribution is in the FIGS. 7a and 7b shown. It can be seen that in a vertical section through the emergency light module or the lens element 20, the light distribution is widely distributed (see Figure 7a ). On the surface to be illuminated (see FIG. 7b ), the light distribution is focused symmetrically along the longitudinal axis (perpendicular to the extension of the notch 24). This light distribution is particularly suitable for illuminating escape routes. The wide distribution allows a large distance of the emergency light modules.

The legs of the V-shaped notch 24 are, as shown in the figures, flat. However, according to alternative embodiments, the legs may also have a curvature in vertical section, wherein the tangent angle of the curvature is chosen such that the conditions of total reflection are fulfilled. Due to the curvature of the V-shaped legs, the light distribution can be further influenced.

Part of the light radiation of the point light source 10 also leaves the light guide body by light exit surfaces 28 directly to the side of the incision 24 without total reflection on the legs of the V-shaped notch 24. This light radiation and a small portion of the light radiation directly through the vertex of the V-shaped Cut 24 leaves the light guide body (see FIG. 6 in the middle), contributes to the light distribution in the light closer Areas, ie closer to the axis z according to Figure 7a or at the midpoint in Figure 7b, at. However, this portion of the light is less than the portion of the light that leaves the luminaire after total reflection at the V-shaped notch. As a result, the wings of the light distribution in the vertical section (see Figure 7a ) are more pronounced than the regions closer to the optical axis of the lens element. Overall, this makes it possible to achieve an approximately uniform illuminance on a flat path below the emergency light module.

Due to the convex curvature of the light entry surface 22, a light bundling to the center of the lens body 20 is achieved. Preferably, the convex curvature is provided only along one axis, in particular parallel to the V-shaped notch 24. This bundling contributes to the fact that the light distribution, as in FIG. 7b is narrowed along an axis perpendicular to the concave curvature of the light entry surface. Furthermore, a greater proportion of the light radiation is deflected onto the legs of the V-shaped notch, so that more light radiation is available for total reflection at the V-shaped notch for light emission from the light exit surfaces 26.

For fastening the lens element to the emergency light module 22, two or four locking feet 21 are provided on the lens body 20 within the light entry surface 22. These locking feet 21 are engaged in two opposite recesses 14 of the lower housing part 4 of the emergency light module. The embodiment with four locking feet 21, as in FIG. 6 4, it is possible to mount the lens element with two different orientation of the longitudinal extension of the V-shaped notch 24 on the housing component. According to the embodiment shown, the longitudinal extent of the V-shaped notch 24 may be as in FIG FIGS. 1 and 2 can be arranged along the lower housing part 4 or perpendicular thereto. In other embodiments, more than two cutouts 14 may be provided on the housing of the emergency light module, so that there is also a lens element with only two locking feet, as in the FIGS. 3 to 5 shown, can be mounted in different positions on the emergency light module. Furthermore, embodiments are possible in which even more cutouts 14 are provided for receiving the locking feet 21 on the emergency light module or even a continuous groove is provided, in which the lens element can be mounted in any orientation with respect to the direction of rotation about the optical axis ,

The emergency light module, as in the Figures 1 and 2 shown, has four fastening elements in the form of locking springs 19, which are integrally formed of plastic on the lower housing part 4. By means of the detent springs 19, the emergency light module can be mounted in a section of a conventional lamp or in another section of a building or a vehicle.

The FIGS. 8 and 9 show two further embodiments of lamps according to the invention, wherein the elements corresponding to the previously described embodiments are provided with the same reference numerals.

Referring to FIG. 8 is a cross section through the lamp shown transversely to the longitudinal extent of the lamp. In the FIG. 8 shown lamp has a plurality of LEDs 10 in a row perpendicular to the image plane of the FIG. 8 extends. Above the LEDs 10, a continuous lens body 20 is arranged, which has in each case a constant cross section in the longitudinal extension of the lamp. The lens body 20 has a V-shaped notch 24, the legs of which are arranged so that light of the LED 10, which impinges on these legs, after total reflection, the lens element 20 leaves through a light exit surface 26 (see light beam L1). Further, the side of the light exit surfaces 26 and light exit surfaces 28 are provided which are opposite to the legs of the V-shaped cutout 24 arranged so that light passes through these light exit surfaces 28 without total reflection at the V-shaped cutout (see light beam L2).

The light entry surface 22 of the lens body 20 has a plurality of sections with convex curvature perpendicular to the longitudinal extension of the lamp. This curvature serves to focus the incoming light beams in the direction of the legs of the V-shaped notch 24 or on the light exit surfaces 28.

The lens body 20 has on both sides of the light entry surface 22 each locking feet 21, which are formed in this embodiment as a continuous webs in the longitudinal direction of the lens body. The locking feet 21 are formed together with the lens body 20 by co-extruding plastic material. The locking feet 21 have in this embodiment, a plastic material which, unlike the lens body 20 is not clearly transparent, but causes a light scattering. Thereby, the light emitted from the LED 10 at a very shallow angle is scattered. The Light distribution of the luminaire after FIG. 8 corresponds in the illustrated cross-section of the light distribution, which in Figure 7a is shown.

The lens element according to the embodiment of FIG. 8 , which comprises the lens body 20 and the locking feet 21, is fixed with the locking feet 21 on a support member 30 by a latching connection. The carrier element 30 extends, as the light guide element itself, over the entire length of the luminaire with a constant cross section. The support member 30 is preferably formed of aluminum or a thermally conductive material in order to derive the heat generated during operation of the LEDs 10 can.

The support member 30 has on the opposite side of the lens element undercuts 31 to receive an approximately U-shaped detent spring 32. The detent spring 32 has two locking legs 33, the upper ends of which engage in the mounted state on the undercuts 31 of the support member 30. The detent spring 32 is fixedly mounted by means of screws 34 or alternatively other fastening means. By the latching connection between the detent spring 32 and the support body 30 can be dismantled without maintenance of the fasteners or screws 34, the lamp for maintenance or replacement.

FIG. 9 shows an alternative embodiment of a luminaire similar to FIG. 8 , In this embodiment, the lens element on both sides of the lens body 20 webs 21 ', which are integrally connected to the lens body 20, and are positively inserted into recesses of the carrier body 30. In this embodiment, in contrast to the embodiment after FIG. 8 , The lens element is not engaged on the support element, but inserted lengthwise. Furthermore, this embodiment has on the support element 30 laterally of the light exit surfaces 26 and 28 of the lens body reflection surfaces 36. These reflection surfaces deflect light, which impinges on the reflection surface from the light exit surfaces 26, 28 of the lens body 20, in the direction of the main emission direction of the LEDs. In this way, similar to the light scattering locking feet 21 of the embodiment after FIG. 8 , Light is redirected from the sides of the luminaire towards the optical axis.

The lens elements of the luminaires according to FIG. 8 and FIG. 9 have a longitudinal extent that is much larger, in particular at least three times greater than its width. Preferably The lens elements have a length of at least 10 cm or 30 cm. These lights, like the previously described embodiments, can be used as emergency lights. There are also other purposes possible. In particular, the lights are also suitable for the uniform illumination of objects for the presentation of goods in the sales area. For example, the lights can be integrated in refrigerators that are open or provided with a window to be used in the sales area. An advantage of the lamp is in particular the use of LEDs as bulbs, because they are energy efficient and have a lower heat loss than comparable conventional bulbs, so that no unnecessary heat input into the refrigerator takes place. The light distribution of light sources 10 arranged in a row, which would be unsuitable for merchandise illumination, is widened by the lens element according to the invention, so that the goods surface can be uniformly illuminated within the cooling device.

Numerous modifications of the above-described embodiments of the emergency light module, the lights and the lens elements are possible without departing from the scope of the invention as defined in the claims. In particular, other forms may be provided for the housing of the emergency light module. For example, the emergency light module can be made in one piece or the emergency light module can be formed integrally with a luminaire. Furthermore, other bulbs can be used as LEDs. For example, an OLED or a conventional filament with an incandescent filament can also be used. In this case, almost pear-shaped bulbs are provided, which means that the dimensions of the light-emitting element in relation to the lens body 20 are very small (for example less than 20%).

Furthermore, embodiments of the lens element are possible in which the V-shaped recess is not formed symmetrically as shown in the figures, but has an asymmetry. Due to the asymmetry, the light distribution can be deflected to one side of the light-guiding element. This embodiment is advantageous, for example, for an emergency light module which is arranged at the end of an escape route, for example on a wall or the like.

LIST OF REFERENCE NUMBERS

2

emergency lighting

4

Housing bottom

6

Housing top

8th

circuit board

10

point-shaped illuminant, e.g. LED

12

electrical connections

14

neckline

19

detent spring

20

lens body

21

Rest feet

21 '

web

22

Light entry surface

24

V-shaped incision

26

Light-emitting surface

28

Light-emitting surface

30

support element

31

undercut

32

detent spring

33

spring leg

34

screw

36

reflecting surface

L1

beam of light

L2

beam of light

Claims (20)

1. Lens element for broadening the light distribution of an approximate point light source (10), in particular an LED, with a transparent light-guiding portion (20), comprising a light entrance surface (22) on a side facing towards the light source (10), and a V-shaped notch (24) on the side opposite the light entrance surface (22), wherein the legs of the V are arranged opposite the light entrance surface (22) at such an angle that light entering from the point light source through the light entrance surface (22) is totally reflected at the V-shaped legs, and wherein both sections of the light-guiding portion define light exit surfaces (26) laterally of the legs of the V, which are arranged opposite the respective legs of the V at an angle, such that the light totally reflected at the V-shaped legs leaves the light exit surfaces (26) without total reflection, characterized in that parts of the two sections of the light-guiding portion (20) are arranged next to the notch (24) relative to the light entrance surfaces (22) in such a way that a part of the light entering through the light entrance surface leaves the light-guiding portion (20) through further light exit surfaces (28) next to the notch (24) without total reflection at the V-shaped legs.
2. Lens element according to claim 1, wherein the light-guiding portion (20), in a section perpendicular to an optical axis of the light entrance surface, and parallel to a plane along which the notch (24) extends, is circular or ellipsoid.
3. Lens element according to any one of the preceding claims, wherein the light entrance surface is convex curved along at least one axis, preferably parallel to the longitudinal extension of the notch.
4. Lens element according to any one of the preceding claims, wherein the legs of the V are arranged mirror-symmetrically relative to a sectional plane through the longitudinal extension of the notch (24) and through the point light source (10).
5. Lens element according to any one of the preceding claims, wherein the light-guiding portion (20) comprises, on the side facing the light source (10), engagement feet (21), preferably two engagement feet or more than two engagement feet, which are arranged symmetrically on a circular circumference.
6. Emergency light module (2), with an approximate point light source (10), in particular an LED, and a lens element according to one of the preceding claims.
7. Emergency light module (2) according to claim 6, wherein the lens element is arranged in the middle above the light source (10).
8. Emergency light module (2) according to claim 6 or 7, wherein the lens element can be installed with different setting positions of the notch (23) above the light source (10).
9. Emergency light module (2) according to any one of claims 6 to 8, with reference back to claim 5, wherein the emergency light module (2) comprises cut-out apertures (14) for accommodating the engagement feet (21) on a circular circumference about the light source (10), wherein, in particular, more cut-out apertures are provided than there are engagement feet (21), and the angular distances in each case of a subset of the cut-out apertures (14) correspond to the angular distances of the engagement feet (21), or wherein more engagement feet (21) than cut-out apertures are provided, and the angular distances in each case of a subset of the engagement feet (21) correspond to the angular distances of the cut-out apertures (14).
10. Emergency light module (2) according to any one of claims 6 to 9, wherein the emergency light module (2) comprises securing means (19) for changeable securing in an installation aperture.
11. Lens element according to any one of claims 1 to 5, Wherein the transparent light-guiding portion (20) exhibits, along the direction of the linear V-shaped notch, a length which is greater than the width of the light-guiding portion perpendicular to the linear V-shaped notch (24), for the broadening of a light distribution of a plurality of approximate point light sources, in particular a plurality of LED's, which are arranged in a row along the V-shaped notch, wherein, preferably, the lens element is at least 10 cm long, in particular at least 30 cm.
12. Lens element according to claim 11, wherein the lens element exhibits a constant cross-section over the length of the V-shaped notch (24).
13. Lens element according to claim 11 or 12, with reference back to claim 5, wherein the engagement feet (21) are arranged as continuous elements on one or both sides of the light entrance surface parallel to the direction of the linear V-shaped notch, wherein the engagement feet (21) are formed in particular from a light-scattering, light-reflecting, and/or light-absorbent material.
14. Lens element according to any one of claims 11 to 13, wherein the lens element is formed as one piece from co-extruded material.
15. Light with a lens element according to any one of claims 11 to 14, wherein the light further comprises a carrier element (30), preferably made of aluminium, with which the lens element is connected and which comprises, opposite the light entrance surface (22), at least one row of approximate point light sources (10), in particular a row of LED's.
16. Light according to claim 15, wherein the carrier element (30) comprises, on a side opposite the lens element, an engagement spring (32), wherein the engagement spring (32) comprises one or more spring legs (33), preferably opposite one another, which are aligned such as to engage with the carrier element (30).
17. Light according to claim 16, wherein the engagement springs (32) extend over the entire length of the light or a plurality of engagement springs are provided, which are arranged distributed over the length of the light.
18. Light according to any one of claims 15 to 17, wherein the face sides of the light comprises cover elements, which are connected in positive fit to the carrier element (30) and/or the lens element.
19. Light according to any one of claims 15 to 18, wherein the lens element, depending on the length, is pushed into an accommodation mounting of the carrier body (30) and is held there in positive fit, or wherein the lens element is held to the carrier element (30) by means of an engagement connection.
20. Light according to any one of claims 15 to 19, wherein the carrier element (20) comprises, laterally to the lens element, at least one or two reflection surfaces (36).

Images