DE102007024014A1 - Illumination apparatus e.g. reading lamp, for use as reading light in aircraft, has light-guiding element axially displaceably arranged in such manner that free-radiation region is provided between light source and light input surface - Google Patents

Abstract

The apparatus has a light source (10) e.g. white light LED, and a light-guiding element (20) pivotable and/or tiltable about a pivoting/tilting point (28). The light-guiding element is provided with a light-guiding axis (22), a light input surface (23) and a light output surface (26). The light-guiding element is axially displaceably arranged in such a manner that a free-radiation region is provided between the light source and light input surface. The element is made of transparent plastic or from glass e.g. high-transparent borosilicate glass such as DURAN(RTM: borosilicate glass).

Description

The The invention relates to a lighting device comprising a light source preferably with at least one light emitting diode and a light guide for Has illumination of an object.

Known are mobile light sources from the dental field, where a light source, For example, an LED lighting unit, with a flexible or rigid light guide is firmly connected. Such light sources be u. a. used for curing dental fillings.

The WO 01/19280 A1 describes, for example, an irradiation apparatus which includes a light-emitting unit and a light-receiving unit having an entrance opening, the light-emitting unit comprising a plurality of light-emitting elements whose rays emitting in a light cone directly irradiate the entrance openings.

The US 2004/0043351 A1 describes a similar unit in which a lens element is provided for better focusing.

From the US 5290169 a similar unit is known in which, inter alia, a rigid optical waveguide is provided, which has a concave geometry as a light entry surface.

task the invention is to provide a lighting device, on the one hand compact and on the other hand a flexible Ensuring illumination of objects. To be sufficient to ensure high illuminance powerful light sources can be used.

The The object of the invention is achieved by a lighting device, the features mentioned in the introduction and / or the following Features includes. These features also include preferred embodiments. In the following, the symbol has particular advantages of the described embodiment out.

In a preferred embodiment of the lighting device according to the invention, the light of a light source ( 10 ) in a light coupling surface ( 23 ) of a light-conducting element ( 20 ), which a Lichtleitachse ( 22 ), coupled and by means of the light guide element by a light output surface ( 26 ) directed to a surface to be illuminated.

Between the light source and the light coupling surface can be a free jet area exist, such that the light source optionally from the light input surface can be arranged away so that between the two in the Usually an air gap is located.

The light guide is about a pan-tilt point ( 28 ) pivotable and / or tiltable arranged so that a user of the lighting device can direct the light to those places where he wants a lighting. As a pivoting movement while the lateral pivoting is referred to, for example, a movement to the left or to the right or the other way round, and as tilting is called a pitching motion, ie a movement from top to bottom or vice versa.

By the deflection of the light originating from the light source by means of of the light guide, it becomes possible, the lighting device particularly compact form. Would the light source directly used for lighting, would be especially at the use of powerful light sources in or on this also means for cooling the light source necessary, Which thus also in the immediate vicinity of the lighting would be attached. In particular known from aircraft LED reading lamps That would mean that the lighting head, in which the LEDs integrated are, should be correspondingly large. The However, using a light guide allows separation the exit location of the illuminating light from the light source itself, which close or directly to a, preferably passive, heat sink can be arranged.

The light guide associated swivel / tilt point ( 28 ) can preferably at the intersection of the light guide ( 22 ) and the light input surface ( 23 ), which brings with it advantages and a low dependence of the light losses on the pivoting / tilting angle of the Lichleitelements for the light coupling in terms of high light output.

Prefers the light guide is rotatably mounted about the Lichtleitachse. This allows the user both by tilting and by twisting bring the light to the places he wishes, in particular when the light guide obliquely to a Main section of the light guide axis emitted. For this purpose, the light guide element two Thighs, have a longer and a shorter, which are connected but tilted relative to each other tilted are. That in the longer leg, thus in the main section the light guiding element guided light is through the transition in the tilted arranged shorter leg also directed in the tilted direction of the shorter leg.

The pan / tilt angle is preferably less than 40 °, preferably 30 °. The light control element ( 20 ) is about the light guide axis ( 22 ) rotatably mounted.

The light guide element ( 20 ) is preferably axially opposite the light source ( 10 ) slidably mounted, wherein the Lichtleitachse ( 22 ) of one leg ( 21 ) of the light-guiding element ( 20 ) or of the light-guiding element ( 20 ) with the beam axis ( 13 ) of the light source ( 10 ) lie on one another. This allows the lighting device ( 1 ) retracted and designed to save space, which brings security benefits for many applications. In the extended state of the free-jet area is the largest, while in the retracted state, a contact between the Lichtleiteinkoppelfläche and the light source can exist. In this latter case, the free-jet area no longer necessarily exists. In addition to this additional adjustment, the axial displaceability of the light guide has the advantage that the lighting device in the retracted state, even when used, can be made very compact and space-saving.

Particularly preferred is the Lichtleitachse ( 22 ) of the light-guiding element ( 20 ) or relative to the beam axis ( 13 ) of the light source ( 10 ) aligned coaxially with each other. As a result, the highest beam intensities of the transmitted light can be achieved.

The light guide element ( 20 ) consists particularly preferably of a transparent plastic (eg PMMA or polycarbonate) or of glass, for example of a highly transparent borosilicate glass (eg ^DURAN® .) The light-conducting element ( 20 ) is constructed in a particularly preferred embodiment of several fibers, in particular of a transparent plastic or of glass fibers.

The light guide element ( 20 ) may be straight, ie it has only a single light guide axis ( 22 ) on.

The light guide element ( 20 ) can also be formed from flexible optical fibers, for example one or more glass fiber bundles or one or more bundles of plastic fibers.

Especially Preferably, fiber rods are used from a glass, which have a NA of about 0.5. With this numerical aperture are acceptance angles possible from about 30 °, d. H. the pan / tilt angle can be a maximum of about 30 °, without the light output to an unacceptable level.

The Fiber rods are known to consist of several Optical fibers made of a core glass, each of which is made of surrounded by a glass shell, which is usually a smaller refractive index as the core glass has.

Also Fiber rods are usable, which consists of a plurality of Optical fibers are formed from a core glass, not individually are enveloped by a coat, but in which the coat the entire fiber rod wrapped. Also mixed forms of these Both described embodiments can are preferably used.

In a further particularly preferred embodiment, in the lighting device according to the invention fiber rods are used as light-guiding element, which have an N _A of about 1. This is achieved by using special types of glass in the fiber rod and allows acceptance angles of about 90 °, which allows pan / tilt angles of up to almost 90 °.

Particular preference is given to using fiber rods with optical fibers with the cladding glasses enveloping the core in each case, wherein the fiber rod additionally has a jacket which encloses the rod with its lateral surfaces. This outer coat can be colorless, but also dyed for certain applications. When using the colorless outer shell this can additionally increase the light output, as this ensures that in addition from the optical fibers vagabonding light can be directed to the illumination. This sheath line can advantageously contribute to an increase in the acceptance angle for light-guiding elements, preferably in the case of light-guiding elements whose N _{A is} not equal to l.

Becomes instead of a fiber rod one consisting of a part of light guide used, for example, a massive glass rod, this can for Homogenization of the originating from the light source light profile contribute, in particular by multiple reflection on the walls of the light-guiding element, a mixture of the light can take place.

Instead of straight light-guiding elements, angled light-guiding elements can also be used with preference. In this case, the light guide ( 20 ) at least one bending area ( 27 ), in such a way that the light-conducting element ( 20 ) a thigh ( 21 ) with a light guide axis ( 22 ) and a light input surface ( 23 ) perpendicular to the light guide axis ( 22 ) is arranged, as well as another leg ( 24 ) with a light guide axis ( 25 ) and a light output surface ( 26 ), wherein the light guide axis ( 22 ) and light guide axis ( 25 ) form a bending or tilt angle relative to each other, which is between 0 ° and 90 °, preferably between 20 ° and 70 °. As a result, a flexible illumination of, for example Ablagetischen, working surfaces and allows the illumination cone ( 29 ) can be individually adapted to the respective needs.

Also Combinations of flexible and rigid elements are used as a light guide or light-guiding elements possible.

By the tilting of the light guide element can lead to reflections of the light emitted from the light source at the light entrance surface come. The reflected light goes for the lighting lost and so can the light output of the lighting device reduce. Therefore, the light entrance surface of the light guide is preferably polished and / or anti-reflective. In a further preferred Embodiment is the housing in which the Light guide and the light source are mounted, and / or at least a part of the housing between the light source and the light entry surface of the light-guiding element, mirrored. This is particularly preferred Housing of the lighting device in the free-jet area mirrored.

The light guide element ( 20 ) preferably has a light output surface ( 26 ), which are opposite the light guide axis ( 22 ) of the light-guiding element ( 20 ) or with respect to the light guide axis ( 25 ) of one leg ( 24 ) of the light-guiding element forms an angle of not equal to 90 °, whereby a schrägeder radiation direction of the illumination cone is made possible.

Other The angles of the light output surface are natural also possible. All angles between 10 ° and 110 ° are when using fiber optic components advantageously feasible. The diameter of a fiber optic light guide is more preferably between 5 and 8 mm. larger Diameters are also possible depending on the application, provided that for the corresponding application less claims be placed on the compactness. For appropriate applications are of course also smaller diameter feasible.

Particularly preferred as the light source ( 10 ) uses one or a plurality of white light LEDs.

The light output surface ( 26 ) is preferably polished or slightly frosted, with a frosted surface for more uniform illumination and a polished surface for spot lighting is more advantageous.

The light input surface ( 23 ) may be flat, convex or concave, wherein when the surface is polished and preferably antireflective is a smaller angle dependence with respect to the light coupling, especially in concave geometry exists.

In Another preferred embodiment has the light element page-emitting properties. This means it can turn on light disengage from its side walls. This can be done, among other things be achieved that the outer wall of the light guide roughened and / or provided with scattering centers, so that Light are coupled out substantially perpendicular to the light guide axis can.

The light source ( 10 ) preferably has a focusing element ( 12 ), with their light rays on a focus area ( 14 ) are focusable. Preferably, the focus area ( 14 ) in the light input surface ( 23 ) of the light-guiding element ( 20 ) or if the light input surface of the light guide is convex or concave in a real or virtual, defined by the light input surface relative to the light guide axis focal point. As a result, a very effective light coupling can be realized.

The board ( 15 ) of the light source particularly preferably has a control electronics ( 16 ) for the light-emitting diode ( 11 ), which, for example, keeps the current constant, which provides a compact design, at the same time an overload protection of the LED and permanently uniform brightness.

Additionally, on the board ( 15 ) is still provided electronics, with which the light source ( 10 ) can be dimmed continuously or in steps, whereby the power consumption can be reduced, for example, in the idle state, furthermore, the illuminance can be adapted to the wishes of the user).

The board ( 15 ) preferably also has a switch ( 17 ), for example in the form of a microswitch, with which the light source ( 10 ) can be switched on / off and / or dimmed in one or more stages. The board is connected via a supply line, additional board or via a receiving socket with the switch.

At the light element or at the border of the light element ( 20 ) a permanent magnet can be attached. The permanent magnet is used to actuate a switch ( 17 ).

The desk ( 17 ), which is mounted on the board can be operated mechanically or non-contact. Under the touch-free operation of the switch ( 17 ) can be understood as an optical, inductive or capacitive actuation of the switch.

The desk ( 17 ) is preferably at axi aler displacement of the light guide element and / or during the pan-tilt movement of the light guide element ( 20 ) and / or during the rotational movement about the light guide axis of the light guide element ( 20 ).

At the light element ( 20 ) or on the border of the light element, a reflection element can be arranged. The reflection element may be formed as a mirror or as a foil. An alternative would be to apply a contrasting color.

In Connection with three-color RGB LEDs is also a color change feasible.

at the use of white light LEDs it is known that the LEDs due to their production also a more or less have very different color temperature. Therefore, be Either electronic circuits used to a specific one To achieve color temperature, or LEDs from a so-called Bin selected, which then a fairly similar color temperature exhibit. By the appropriate choice of materials (eg glasses) of the light guide, the corresponding spectral transmission profiles own, an adjustment of the color temperature of the LEDs is possible. The glass acts specifically as a color filter. For example a glass rod with the beam profile homogenizing properties used as a light guide, the transmission in a, tint of the transmitted light can cause a cluster of white light LEDs used as a light source, usually rather has a too cold color temperature, and at the lighting location is nevertheless achieved a neutral color temperature.

The heat sink ( 40 ) may be part of a housing attachment for the lighting device ( 1 ) be. If the lighting device is integrated, for example, in a seat, a thermally conductive frame of the seat, which is usually present anyway, serve as a passive heat sink and thus make an active cooling of the light sources or large-scale passive heat sink superfluous, with passive cooling being understood as cooling, which does not require fans or Peltier elements or other energy consuming elements. This contributes to the compactness and low noise of the lighting device.

The light guide element ( 20 ) of the lighting device ( 1 ) preferably in the switched-off state of the light source ( 10 ) a rest position and when switched on a working position along the beam axis ( 13 ) of the light source ( 10 ), whereby the integration in a push-push housing is advantageously possible.

The ratio of the surface of the light coupling surface ( 23 ) to the surface of the light output surface ( 26 ) of the light-guiding element ( 20 ) can not be equal to 1, whereby an adjustment of the numerical aperture of the light-guiding element ( 20 ) to the radiation characteristic of the light source ( 10 ).

The light output surface ( 26 ) may have any contour, wherein the light input surface ( 23 ) is preferably circular.

The following uses are advantageously possible inter alia with the lighting device:
Use of the illumination device ( 1 ) as a seat lighting, as a reading light for aircraft seats, for seats in rail vehicles and / or in motor vehicles, especially in cars or coaches, the compact design and high functionality is particularly attractive.

Use of the illumination device ( 1 ) as a work lamp, which can be integrated in ceilings or walls.

Use of the illumination device ( 1 ) in furniture, especially in kitchen furniture.

Use of the illumination device ( 1 ) as object lighting in showcases.

Use of the illumination device ( 1 ) as glare-free, possibly retractable instrument lighting in cars (eg in the cockpit, center console, overhead console, as a map reading lamp).

Use of the illumination device ( 1 ) as integrated microscope illumination, wherein the microscope stand as a heat sink ( 40 ) is usable.

For This application is particularly the advantage of the invention Lighting device to wear that this extremely compact can be executed. As a result, in particular effect lighting possible in places previously not with appropriate Lighting effects could be considered. As the interior meanwhile a weighty selling point especially for Represents aircraft, the inventive has Lighting device also has significant economic benefits compared to previously known lighting devices.

The Invention will be described below with reference to preferred embodiments in more detail and with reference to the attached Drawings described.

in this connection demonstrate

1 the only schematically shown plan view of a lighting device according to the invention,

2 the lateral view of the in 1 shown illumination device according to the invention.

Detailed description preferred embodiments

In a first preferred embodiment of the invention, which in the 1 and 2 for the sake of clarity, the lighting device comprises a light source ( 10 ) and one at a pan-tilt point ( 28 ) pivotable and / or tiltable light guide ( 20 ), the at least one light guide axis ( 22 ) and at least one light input surface ( 23 ) and a light output surface ( 26 ) having.

As a light guide axis is that axis or direction of the light guide element ( 20 ), along which the main propagation direction of the guided light extends and which generally the axis of symmetry of the light-guiding element (FIG. 20 ) corresponds.

The light guide element ( 20 ) is, preferably axially displaceable, arranged so that between the light source ( 10 ) and the light input surface ( 23 ) a free jet area ( 9 ) can exist.

The pan-tilt point ( 28 ) of the pivotally tiltable light-guiding element ( 20 ) lies at the intersection of the light guide axis ( 22 ) and the light input surface ( 23 ).

Furthermore, the light guide element ( 20 ) in addition to its pivotable tiltability about the light guide axis ( 22 ) rotatably mounted.

Of the Pan-tilt angle is in this preferred embodiment less than 40 °, preferably less than 30 °.

In the preferred embodiment of the illumination device described here, the light guide element ( 20 ) with respect to the light source ( 10 ) In addition to its pivoting and tilting axially displaceable, preferably parallel slidably mounted to the Lichtleitachse.

Preferably, the light guide axis ( 22 ) of the light-guiding element ( 20 ) in a further embodiment relative to the beam axis ( 13 ) of the light source ( 10 ) arranged coaxially, this means that the lateral offset between the light propagation direction of the light originating from the light source with the substantially highest light intensity and the light guide axis is as small as possible.

The light guide element ( 20 ) preferably consists of a transparent plastic or of glass, preferably of a highly transparent borosilicate glass and particularly preferably consists of DURAN ^® .

In an alternative embodiment, the light-guiding element ( 20 ) rigid and composed of several fibers of a transparent plastic or glass fibers. Here, the light guide ( 20 ) are constructed by rigidly interconnected or flexibly held optical fibers.

In yet another alternative embodiment, the light guide ( 20 ) rigid and designed as internally mirrored hollow body, for example as a columnar hollow body with a round, elliptical or polygonal cross-section.

The light guide element ( 20 ) can either be straight or alternatively with at least one kink or bending region (FIG. 27 ), wherein the light guide element ( 20 ) then a thigh ( 21 ) with a light guide axis ( 22 ) and a light input surface ( 23 ) which is perpendicular or oblique to the light guide axis ( 22 ) is arranged, as well as another leg ( 24 ) with a light guide axis ( 25 ) and a light output surface ( 26 ), in which the light guide axis ( 22 ) and light guide axis ( 25 ) form an angle greater than or equal to 0 ° and less than or equal to 90 °.

In a further embodiment, the light guide ( 20 ) consist of a combination of flexible optical fibers and rigid elements.

The light output surface ( 26 ) can be polished or slightly frosted and have a flat, convex or concave shape.

The surface of the light input surface ( 23 ) is preferably polished and provided with an antireflection coating.

In a further embodiment, the light guide ( 20 ) have side-emitting characteristics to thereby provide adequate backlighting.

The light source ( 10 ), which is preferably a white-light LED or comprises a combination of red, blue and green LEDs, a focussing element ( 12 ), with which the light beams can be focused.

The light beams are preferably focused on a focal surface ( 14 ) Focusable in the Lichteinkoppel area ( 23 ) of the light-guiding element ( 20 ) is arranged or if the light input surface of the light guide is convex or concave, in a real or virtual, defined by the light input surface relative to the light guide axis focal point.

When real or virtual focal point is understood as that place from which light rays come substantially parallel continue to propagate to the light guide axis of the light guide. When Essentially parallel will be deviations from the actual Direction of the light guide axis of up to 20 °, preferably to at 10 ° and most preferably up to 5 °.

By through the spectral profile of the absorption of the material of the light guide element ( 20 ), a targeted adjustment of the color temperature of the light emitted by the lighting device is also effected.

Preferably, the white light LED is on a circuit board ( 15 ), which a control electronics ( 16 ) for the light-emitting diode ( 11 ), which preferably keeps the current constant.

In an alternative embodiment, the control electronics ( 16 ) are designed so that with this the white light LED or the LED's are dimmable steplessly or in stages.

For this purpose, in another embodiment, the board ( 15 ) a switch ( 17 ), with which the light source ( 10 ) can be switched on / off and / or dimmed in one or more stages With the aid of a supply line, additional board or a receiving socket, the switch can be connected to the board.

Another preferred embodiment comprises a non-contact or non-contact switch ( 17 )

In this embodiment, at the light element or at the border of the light element ( 20 ) attached a permanent magnet. The permanent magnet is used for non-contact operation of the switch ( 17 ), which may be formed in this case, for example, as a reed contact or reed relay or switch by means of the Hall effect.

Around a non-contact operation of the switch can allow the switch by means of a light emitting diode detect optical signals, for example as reflected signals or as an interruption of a light barrier also the absence of a capture optical signal.

In an alternative embodiment, the switch ( 17 ) also perform inductive or capacitive switching operations.

Alternatively to a reed contact, the switch ( 17 ) can also be operated on the basis of the Hall effect.

In the preferred embodiment, the switch ( 17 ) during axial displacement of the light-guiding element and / or during the pan-tilt movement of the light-guiding element ( 20 ) and / or during a rotational movement about the light guide axis of the light guide element ( 20 ).

In the case of an optically switching non-contact switch on the light element ( 20 ) or arranged on the border of the light element, a reflection element. The reflection element may be formed as a mirror or as a foil. The formation of a reflection elements can also be achieved by applying a contrasting color.

The lighting device comprises a heat sink ( 40 ), which is part of at least one housing attachment for the lighting device.

With the thermal coupling ( 18 ) to the fixed heat sink ( 40 ) can be ensured that, for example, LEDs can be used with relatively high luminous efficacy. An active cooling of the light source ( 10 ) as well as the control electronics ( 16 ) is therefore not required in this embodiment.

In a further preferred embodiment, the light-guiding element ( 20 ) of the lighting device ( 1 ) in the off state of the light source ( 10 ) a rest position and a switched on state a working position, along the beam axis ( 13 ) of the light source ( 10 ) are offset axially relative to each other.

The ratio of the surface of the light coupling surface ( 23 ) to the surface of the light output surface ( 26 ) of the light-guiding element ( 20 ) is preferably not equal to 1, in particular around the numerical aperture of fibers of the light-conducting element ( 20 ) to adapt to the Abstrahicharacteristik the light guide.

The light output surface ( 26 ) have a plurality of different contours whereas the light input surface ( 23 ) is circular.

The The illumination device described above is advantageous as seat lighting and / or reading light for aircraft seats and / or for seats in rail vehicles and / or in motor vehicles usable.

The use as a work light, which is integrated in ceilings or walls brings on The compact design offers significant advantages. The same applies to the use of the lighting device in furniture, especially in kitchen furniture or as object lighting in showcases.

Advantageous Furthermore, the use of the illumination device as glare-free, possibly retractable instrument lighting in cars, in particular also as effect lighting especially for airplanes.

use the lighting device according to at least one of the preceding Claims as integrated microscope illumination.

The inventive lighting device has especially the advantage that the compact is building and it nevertheless allows light to be transmitted efficiently via a pivoting and / or tiltable light-guiding element, which in addition in the direction of Light source is displaceable, to guide to the place that illuminates shall be.

Due to the pivoting / tilting mounting of the light-guiding element ( 20 ) can be achieved a high degree of flexibility in terms of the illumination of objects. Overall, a particularly compact design is possible with this arrangement, which allows in particular a space-saving installation.

There the at least one light-emitting diode is mounted on a circuit board, which preferably fixed by means of a thermal coupling with a fixed heat sink is connected, can itself at high light output to an active, energy-requiring Cooling device can be omitted.

1

lighting device

9

Free jet area

10

light source

11

led

12

focusing

13

beam axis

14

focus area

15

circuit board

16

control electronics

17

switch

18

thermal coupling

20

light guide

21

leg

22

guiding axis

23

light injection

24

leg

25

guiding axis

26

light coupling

27

bending area

28

Swivel-tipping point

29

lighting cone

30

object

40

heat sink

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• WO 01/19280 A1 [0003]
• US 2004/0043351 A1 [0004]
• - US 5290169 [0005]

Claims (39)

Lighting device with a light source ( 10 ) and one around a pan-tilt point ( 28 ) pivotable and / or tiltable light guide ( 20 ), the at least one light guide axis ( 22 ) and at least one light input surface ( 23 ) as well as a Lichtaunkoppelfläche ( 26 ), wherein the light-guiding element ( 20 ), preferably axially displaceable is arranged so that between the light source ( 10 ) and the light input surface ( 23 ) a free jet area ( 9 ) can exist. Lighting device according to claim 1, wherein the pan-tilt point ( 28 ) at the intersection of the light guide axis ( 22 ) and the light input surface ( 23 ) lies. Lighting device according to claim 1 or 2, wherein the light-guiding element ( 20 ) around the light guide axis ( 22 ) is rotatably mounted. Lighting device according to at least one of preceding claims, wherein the pan-tilt angle is less than 40 °, preferably less than 30 °. Lighting device according to at least one of the preceding claims, wherein the light-guiding element ( 20 ) with respect to the light source ( 10 ) Is mounted axially displaceable. Lighting device according to claim 5, wherein the light guide axis ( 22 ) of the light-guiding element ( 20 ) relative to the beam axis ( 13 ) of the light source ( 10 ) is arranged coaxially. Lighting device according to at least one of the preceding claims, wherein the light-guiding element ( 20 ) is made of a transparent plastic or of glass, preferably of a highly transparent borosilicate glass, particularly preferably of DURAN ^® . Lighting device according to at least one of the preceding claims, wherein the light-guiding element ( 20 ) is rigid and composed of several fibers of a transparent plastic or glass fibers. Lighting device according to at least one of the preceding claims, wherein the light-guiding element ( 20 ) is straight. Lighting device according to at least one of the preceding claims, wherein the light-guiding element ( 20 ) is formed by flexible optical fibers. Lighting device according to at least one of claims 1 to 9, wherein the light-guiding element ( 20 ) at least one bending area ( 27 ), which is designed such that the light-guiding element ( 20 ) a thigh ( 21 ) with a light guide axis ( 22 ) and a light input surface ( 23 ), which is perpendicular to the light guide ( 22 ) is arranged, as well as another leg ( 24 ) with a light guide axis ( 25 ) and a light output surface ( 26 ), wherein the light guide axis ( 22 ) and light guide axis ( 25 ) form an angle greater than or equal to 0 ° and less than or equal to 90 °. Lighting device according to at least one of the preceding claims, wherein the light-guiding element ( 20 ) is formed of a combination of flexible optical fibers and rigid elements. Lighting device according to at least one of the preceding claims, wherein the light output surface ( 26 ) is polished or slightly frosted. Lighting device according to at least one of the preceding claims, wherein the light input surface ( 23 ) is plan, convex or concave. Lighting device according to at least one of the preceding claims, wherein the surface of the light coupling surface ( 23 ) and / or provided with an antireflection coating. Lighting device according to at least one of the preceding claims, wherein the light-guiding element ( 20 ) has side emitting properties. Lighting device according to at least one of the preceding claims, wherein the light source ( 10 ) a focusing element ( 12 ), with which the light rays on a focus area ( 14 ) are focusable, the light input surface ( 23 ) of the light-guiding element ( 20 ) corresponds. Lighting device according to at least one of the preceding claims, wherein the spectral profile of the absorption of the material of the light guide element ( 20 ) a targeted adjustment of the color temperature of the light emitted by the lighting device is effected. Lighting device according to at least one of the preceding claims, wherein as light source ( 10 ) at least one white light LED is used. Lighting device according to at least one of the preceding claims, wherein the circuit board ( 15 ) of the light source driving electronics ( 16 ) for the light-emitting diode ( 11 ), which preferably keeps the current constant. Lighting device according to at least one of the preceding claims, wherein the circuit board ( 15 ) has a circuit with which the light source ( 10 ) is infinitely dimmable or in stages. Lighting device according to at least one of the preceding claims, wherein the circuit board ( 15 ) with a switch ( 17 ), which is preferably connected via a supply line, additional board or a receiving socket and thus the light source ( 10 ) can be switched on / off and / or dimmed in one or more stages. Lighting device according to Claim 22, in which the switch ( 17 ) is contactlessly switchable. characterized in that the light element or on the border of the light element ( 20 ) a permanent magnet is arranged with which the switch ( 17 ) is actuated. Lighting device according to claim 22 with a switch ( 17 ), which is optically, inductively, capacitively or by Hall effect actuated. Lighting device according to one of claims 22 or 23, characterized in that the switch ( 17 ) is actuated by a) a pan-tilt movement of the light-conducting element ( 20 ) and / or b) a rotational movement about the Leitleitachse of the light-guiding element ( 20 ) and / or c) an axial displacement of the light-guiding element. Lighting device according to at least one of the preceding claims, in which on the light element ( 20 ) A reflection element is arranged. A lighting device according to claim 26, wherein the reflection element as a mirror or as a foil or through the Applying a contrasting color is formed. Lighting device according to at least one of the preceding claims, with a heat sink ( 40 ), which is part of a housing attachment for the lighting device. Lighting device according to at least one of the preceding claims, wherein the light-guiding element ( 20 ) of the lighting device ( 1 ) in the off state of the light source ( 10 ) has a rest position and in the switched-on state a working position which is along the beam axis ( 13 ) of the light source ( 10 ) is shifted. Lighting device according to at least one of the preceding claims, wherein the ratio of the area of the light coupling surface ( 23 ) to the surface of the light output surface ( 26 ) of the light-guiding element ( 20 ) is not equal to 1. Lighting device according to at least one of the preceding claims, wherein the light output surface ( 26 ) has any contour, wherein the light input surface ( 23 ) is circular. Light guide element, in particular for a lighting device according to one of the preceding claims, comprising a light guide axis ( 22 ) and at least one light input surface ( 23 ) and a light output surface ( 26 ). Use of the lighting device after at least one of the preceding claims as a seat lighting and / or Reading light for aircraft seats and / or for seats in rail vehicles and / or in motor vehicles. Use of the lighting device after at least one of the preceding claims as a work lamp, the Can be integrated in ceilings or walls. Use of the lighting device after at least one of the preceding claims in furniture, in particular in kitchen furniture. Use of the lighting device after at least one of the preceding claims as object lighting in showcases. Use of the lighting device after at least one of the preceding claims as glare-free, possibly retractable Instrument lighting in cars. Use of the lighting device after at least one of the preceding claims as an integrated microscope illumination. Use of the lighting device after at least one of the preceding claims as a lighting element in vehicles, especially as effect lighting especially for Aircraft.