DE102022202041A1 - HOLOGRAPHIC LIGHTING DEVICE WITH ELEMENTS ARRANGED ALONG A CENTRAL AXIS AND COUPLING SURFACE IN THE EDGE AREA - Google Patents

Abstract

The invention relates to a holographic lighting device with a central axis, on which an edge-lit hologram with a planar extension transverse to the central axis and a lighting arrangement for hologram lighting are arranged along the axis. The edge-lit hologram has a light coupling surface on a transversal edge area of the edge-lit hologram and the illumination arrangement is set up for illuminating the light coupling surface for radiating illumination light into the edge-lit hologram through the light coupling surface. The Edge-Lit hologram is set up to generate a holographic lighting function, which is visible when looking at the side of the Edge-Lit hologram remote from the lighting arrangement Arrangement for the holographic lighting device.

Description

The invention relates to a holographic lighting device with a central axis, on which an edge-lit hologram with a planar extension transverse to the central axis and a lighting arrangement for hologram lighting are arranged along the axis. The edge-lit hologram has a light coupling surface on a transversal edge area of the edge-lit hologram and the illumination arrangement is set up for illuminating the light coupling surface for radiating illumination light into the edge-lit hologram through the light coupling surface. The edge-lit hologram is set up to generate a holographic lighting function which is visible when viewing the side of the edge-lit hologram remote from the lighting arrangement.

Furthermore, the invention relates to an edge-lit hologram, spacers and/or a lighting arrangement for a form-fitting arrangement with the holographic lighting device.

Background and state of the art:

In many display applications, for example in technical applications, the space available for the display is limited. At the same time, the demands on displays are increasing, since it has been understood that the most targeted and intuitive display of information can increase the usability and ultimately the security of technical applications. A typical example is a display in an automobile. However, there are often limitations in the installation space, especially there. The available installation space is designed, for example, in such a way that it is cylindrical, cuboid or comparable and the ratio of the diameter or width to the length of the cylinder, the cuboid or the comparable shape is 1:2 or less. The light source, in particular an LED, can usually only be positioned on one of the front sides, since otherwise the control of the LED (board, connector, cable, ...) is difficult due to the space. Accordingly, the installation space extends mainly in the main emission direction of the LED (i.e., for example, perpendicular to the arrangement plane of the emitter), while there is little space perpendicular to the main emission direction.

Modern displays can be enhanced by the means of holography. Holographic displays not only enable a spatial representation of the displayed image, but also increase the possibilities and qualities of a display through other advantages. Above all, holograms enable a wavelength- and angle-selective diffraction of light rays and thus enable a particularly good adaptation of the illuminated display to desires and circumstances.

In holography, in contrast to normal images, e.g. photography, in addition to the intensity of the imaged object, phase relationships of the light coming from the object are also stored. These phase relationships contain additional spatial information, which means that a three-dimensional impression of the image can be generated. This is done with the help of interference of light rays during shooting of the object. The object is illuminated with coherent light and is reflected and scattered by the object. The resulting wave field, the so-called object wave, is superimposed with light coherent with the object wave (the so-called reference wave - typically from the same light source, e.g. a laser) and the wave fields interfere with each other as a function of their phase relationship. The resulting interference pattern is recorded, for example, by means of a light-sensitive layer, and the information contained in the phase is thus also stored. For the reconstruction, the resulting hologram is illuminated with a light wave that is identical or similar to the reference wave, which is then diffracted by the recorded interference pattern. In this way, the original wavefront of the object wave can be reconstructed.

There are different types of holograms, e.g. B. so-called volume holograms. Volume holograms preferably have a thickness that can also be used to store holographic image information. Volume holograms can be white light holograms, in particular, since these can have wavelength selectivity due to wavelength-selective interference.

For example, holograms can be transmission and reflection holograms, which produce this reconstruction either in transmission or in reflection. If you are z. B. in a transmission hologram on an opposite side of the light source of the hologram and looks at this, appears z. B. the imaged object in three dimensions in front of you. In the case of a reflection hologram, one must preferably be on the same side as the light source. Reflection holograms preferably have a wavelength selective efficiency to bend the light in a certain direction (along a certain angle). The word hologram is preferably used here as a synonym for the holographic structure that produces the diffraction of light. Commonly, the term "hologram" is sometimes used to describe the generated, particularly three-di referred to as mensional image. However, the person skilled in the art knows from the context what is meant by the term “hologram”.

In addition to the three-dimensional representation, holograms can be used in the form of so-called holographic-optical components (HOE), whose holographic properties can be used for the optics of devices. For example, HOE can replace conventional lenses, mirrors and prisms. In other cases, HOEs are used as special diffraction gratings. For example, HOEs exhibit spectral selectivity and/or incident angle selectivity. At the same time, they can be completely or partially transparent for other spectral ranges and/or angles of incidence. A combination of representation and light shaping is also made possible by holograms.

Holograms, in particular technical holograms, can be recorded directly using various holographic processes or printed from computer-generated data using wavefront printers or stereo holographic printers. These production methods are suitable for mass production of optical functions in the form of holograms, but typically not because of the high expenditure of time. Suitable, in particular optical, replication methods are available for this purpose.

For a holographic display, for example in a motor vehicle interior, it is advantageous to use an edge-lit or waveguide arrangement. Edge-Lit holograms are holograms that are partially integrated in a transparent light guide. They are preferably illuminated at a large angle, in particular from a side surface of the light guide body. In this case, the hologram itself is located, for example, on or on a flat outer surface of the light-guiding body and the illumination takes place from the side of the light-guiding body, with the light being guided to the hologram between outer surfaces in the light guide. It is advantageous that, on the one hand, the light-guiding body can be designed to guide the light relatively trouble-free over longer distances and, on the other hand, that a desired alignment of hologram to illumination within the scope of manufacturing tolerances is automatically ensured by the light-guiding body. The desired alignment has a large effect on the quality of the holographic display and is therefore important. However, edge-lit holograms typically require a larger installation space due to the requirements mentioned above.

Since the hologram is illuminated from a substrate in these EdgeLit arrangements and at an angle that is greater than the angle of total reflection for the corresponding substrate, they have the property that the 0th diffraction order remains in the substrate and not in the direction of the viewer (or the vehicle interior) is emitted. This prevents the viewer from being dazzled.

However, since the installation space in the lateral direction is often very limited, as described above, it is difficult to illuminate a hologram at an angle that is greater than the angle of total reflection. In most cases, the compromise has to be made that the hologram size is significantly smaller than the front surface of the installation space and it can no longer be arranged in the center of this surface.

It is therefore not possible with the means of the prior art to overcome these limitations and to implement a configuration in which the hologram does not emit any disturbing 0th diffraction order in the direction of an observer and at the same time the hologram area can be kept at a maximum

Object of the invention:

It is an object of the invention to realize a lighting device without the disadvantages of the prior art. In particular, it is an object of the invention to provide an improved display with compact dimensions that are particularly suitable for installation.

Summary of the invention:

The object is solved by the features of the independent claims. Preferred embodiments of the invention are described in the dependent claims.

In a first aspect, the invention relates to a holographic lighting device with a central axis on which an edge-lit hologram with a planar extension transverse to the central axis and an illumination arrangement for hologram illumination are arranged along the axis, the edge-lit hologram having a light coupling surface on a transversal edge area of the edge-lit hologram, the edge-lit hologram being set up for essentially full-surface hologram illumination at an angle greater than the angle of total reflection within the edge-lit hologram by illumination light radiated into the light coupling surface, the edge -Lit hologram is set up to produce a holographic light function in the hologram illumination, which when considering the Lighting arrangement farthest side of the edge-lit hologram is visible, the lighting arrangement being set up for illumination of the light coupling surface for the irradiation of illumination light into the edge-lit hologram through the light coupling surface.

A holographic lighting device is a device with a lighting function, in particular a display, which is implemented using holographic means, for example a holographic structure or a hologram.

A central axis of the holographic lighting device preferably defines the longitudinal extent of the device. Preferably, the outer edges of the device are spaced apart in a direction transverse thereto. The distances can be the same or approximately the same in all directions. The axis is thus preferably located centrally, or substantially centrally, in relation to a transverse extension of the device, inside the device. The central axis can preferably run through the geometric center of gravity of the device and/or its elements. A central axis can include the cylinder axis, for example, if the device has cylindrical or substantially cylindrical external dimensions. Then the central axis would be, so to speak, an axis of rotational symmetry.

The central axis is preferably an imaginary line through the lighting device. However, the central axis can also be a physical axis to which, for example, the elements of the lighting device are attached.

Terms such as essentially, approximately, about, approx. etc. preferably describe a tolerance range of less than ±40%, preferably less than ±20%, particularly preferably less than ±10%, even more preferably less than ±5% and in particular less than ± 1%. Similarly, preferably describes sizes that are approximately the same. Partially describes preferably at least 5%, more preferably at least 10%, and especially at least 20%, in some cases at least 40%. Terms such as essentially always include the exact value.

An edge-lit hologram with a planar extension transverse to the central axis and an illumination arrangement for hologram illumination are arranged on the axis. This preferably means that these elements are arranged one after the other or next to one another on the axis, ie in particular without overlapping. In this case, the elements mentioned can preferably be arranged directly next to one another or at a distance from one another.

As already described above, the edge-lit hologram preferably comprises a light-conducting body and a holographic structure for generating the illuminated display. In this case, the holographic structure preferably extends along the areal extent of the edge-lit hologram and in this case extends in particular over at least 50% of this areal extent. In this case, the light-guiding body is preferably transparent, in particular for the illumination light (see below).

Transparent preferably means that one can essentially see through the base body. Transparent means in particular that the base body has a transmittance of at least 40%, at least 45%, at least 50%, at least 55%, at least 60%, based on the intensity of the light emitted by the lighting arrangement (preferably in a wavelength range between 420 nm and 750 nm). %, at least 65%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90% and/or at least 95%.

The edge-lit hologram preferably has a planar extension transverse to the central axis. Extension transverse to the central axis preferably describes an extension perpendicular to the central axis.

In this context, flat means in particular forming a broader surface, flattened and/or expanding on a surface. Two-dimensional can mean, for example, that the edge-lit hologram has a large extent along a plane or surface and a relatively significantly smaller extent in a direction perpendicular thereto. Significantly smaller extent preferably means an extent smaller by at least a factor of two than the smallest extent along the surface or plane, more preferably an extent smaller by at least a factor of three, even more preferably an extent smaller by a factor of at least four, even more preferably an extent that is at least a factor of five less, and in particular an extent that is at least a factor of ten less.

The illumination arrangement for illuminating the hologram is preferably set up for illuminating the hologram or the holographic structure with electromagnetic radiation suitable for this purpose. This relates, for example, to the frequency spectrum of the electromagnetic radiation, the intensity of the electromagnetic radiation and/or at least in part the geometric cal beam properties of electromagnetic radiation. This electromagnetic radiation is preferably generated or emitted by the lighting arrangement. For this purpose, the lighting arrangement can preferably comprise a light source. The electromagnetic radiation is preferably radiation with a spectrum in the visible range. Such electromagnetic radiation is commonly and also preferably referred to in this document as “light”.

The Edge-Lit has the light coupling surface on a transversal edge area of the hologram. The edge area preferably describes an area which essentially adjoins the outer, transverse edge of the Edge-Lit hologram which extends transversely (to the axis) and extends essentially from there in the planar part of the Ege-Lit hologram in the direction of the central axis, preferably but without extending to the central axis.

Preferably, the light coupling surface is directly adjacent to the transversal edge of the edge-lit hologram.

For the light coupling surface, it applies preferably, as preferably all the features of the lighting device described here, that “a light coupling surface” describes “at least one light coupling surface”. It can therefore include several light coupling surfaces, for example 2, 3, 4, 5, 6, 7, 8, 9, 10 or even more light coupling surfaces.

Instead of speaking of a plurality of light coupling surfaces, this document can also preferably speak of different areas of the light coupling surface. However, different areas of the light input surface can also describe different sections of a continuous light input surface, which differ, for example, in that they lie in different radial directions to the central axis and/or are arranged along different, non-parallel tangents to a circle around the central axis. Such sections are preferably also referred to as differently oriented areas. Such a region can, for example, be almost infinitesimally narrow in the case of an annular coupling surface, because in this case the arrangement location and/or the surface normal of the coupling surface changes continuously.

The light coupling surface is set up in particular for coupling the light from the lighting arrangement into the edge-lit hologram, and therefore in particular into its light-conducting body. For this purpose, it is preferably transparent to the light and has dimensions and/or an orientation that optimizes this coupling or enables it to a sufficient extent. The light coupling surface can primarily be a dedicated surface, which is a separate surface of the edge-lit hologram, and therefore of the light-guiding body. However, it can also preferably be a surface integrated into a surface of the light-conducting body that is not a light coupling surface. The light coupling surface is here and otherwise defined in particular by the fact that it is a surface on a transversal edge region of the edge-lit hologram, which is suitable as described for coupling light or is set up for this as described.

The fact that the light coupling surface is set up for coupling the light from the lighting arrangement into the edge-lit hologram preferably means that it is set up for irradiating the lighting light from the lighting arrangement into the edge-lit hologram, and therefore preferably into its light guide body.

The Edge-Lit hologram is set up for essentially full-area hologram illumination by illumination light radiated into the light coupling surface. This preferably means that the hologram comprised by the edge-lit hologram or its holographic structure is illuminated essentially over its entire surface by the illumination light radiated (coupled) through the light coupling surface, i. H. in particular that a significant proportion of the irradiated illuminating light reaches the hologram or the structure essentially on its or their entire surface.

In this case, the illumination light preferably comprises the light of the illumination arrangement.

The full-surface illumination is preferably essentially homogeneous. In this case, homogeneous means in particular that the holographic structure is illuminated with predominantly the same intensity over its entire surface. Preferably, a variation in intensity across the holographic structure, in particular substantially the entire holographic structure, is less than 20%, more preferably less than 10% and especially less than 5%. A ratio of minimum intensity I _min (or minimum illuminance or irradiance) to maximum intensity I _max (or maximum illuminance or irradiance) is preferably I _min /I _max >0.8.

The illumination of the hologram or the holographic structure takes place at an angle that is greater than the angle of total reflection inside the Edge-Lit hologram. This preferably means that the illumination light propagates in the direction of the hologram essentially in such an angle or angle spectrum (this is how the range of the angles covered is preferably referred to) that at least significant parts of the irradiated illumination light with the along the areal extent of the Edge-Lit Hologram extended interface (s) of the edge-lit hologram forms one or more angles which is greater than a critical angle of total reflection at this interface. As a result, illuminating light striking the interface at this angle(s) would be essentially completely reflected at this interface, although the interface is fundamentally transparent to the illuminating light. The person skilled in the art knows how to calculate the critical angle of total reflection if he knows the refractive index of the edge-lit hologram at the interface and the refractive index of the area outside the edge-lit hologram at the interface (e.g. air under standard conditions).

Inside the Edge-Lit hologram preferably means inside the light guide body.

The essentially full-surface hologram illumination at an angle greater than the angle of total reflection can advantageously ensure that the zeroth diffraction order of the hologram, which is undesirable because it contains no information from the hologram and could blind a user, in the edge-lit hologram in Consequence of the total reflection remains.

The Edge-Lit hologram is set up to generate a holographic lighting function when the hologram is illuminated. A holographic lighting function describes in particular a functionality that is to be brought about by using the lighting device, for example displaying information for a user by generating a real and/or virtual image or by deflecting illuminating light in the direction of a potential user.

This is preferably located on the side of the edge-lit hologram remote from the lighting arrangement, so that the holographic lighting function is expediently visible when viewing the side of the edge-lit hologram remote from the lighting arrangement.

Due to the flat extension of the edge-lit hologram transverse to the central axis, this preferably forms a kind of boundary surface of the lighting device to the outside. The device, in particular its lighting arrangement, is essentially located on one side of this interface. On the other side of this interface, the lighting device should preferably be viewed by a user. The side of the edge-lit hologram that is remote from the lighting arrangement is preferably located on this side, which side can thus be viewed by the user.

The angle or angles, the centroid angle and/or the angle spectrum of the full-area hologram illumination and the reconstruction angle and/or the acceptance angle spectrum of the edge-lit hologram (preferably: the holographic structure) are matched to one another.

The acceptance angle spectrum preferably describes an angular range around the reconstruction angle for which the holographic structure has the properties desired and described here. In particular, the acceptance angle spectrum is defined in relation to the diffraction efficiency of the holographic decoupling structure, which is considered as a function of the angle range described above. The efficiency can preferably assume values between 0 (e.g. no light is diffracted) and 1 (all light is diffracted). In this case, the acceptance angle spectrum is preferably defined in that the diffraction efficiency for the angle range encompassed is 0.1 or greater, more preferably at least 0.5.

The acceptance angle spectrum is preferably measured with respect to or defined around the reconstruction angle. The reconstruction angle is preferably the angle at which the holographic structure was recorded and/or at which the diffraction efficiency is at its maximum. The acceptance angle spectrum is preferably determined by the distribution of the outcoupling efficiency around the reconstruction angle. The reconstruction angle can preferably be measured in relation to the surface normal of the holographic structure and/or to the surface normal of the surface comprised by the holographic structure.

The angular spectrum preferably describes the angular proportions of the light rays or bundles of rays illuminating the holographic structure in relation to a reference straight line and/or reference plane, in particular in relation to the centroid angle of the illuminating light rays or in relation to the reconstruction angle of the holographic structure. The angular spectrum is characterized, for example, by the shape of the wave front of the propagating light along the beam path. The angular spectrum can, for example, be determined by the angle that the perpendicular to different oriented wavefronts or differently oriented areas of a wavefront with the take the reference planes, straight lines and/or angles mentioned above. A plane wave would, for example, cause the decoupling structure to be illuminated only from one angle or the light to propagate along the beam path without divergence, so the angular spectrum would advantageously be equal to zero.

The centroid angle is preferably the angle measured in relation to a surface normal at which the incident and/or emitted light intensity is greatest.

The angular spectrum impinging on a holographic structure can preferably be determined by determining the square mean of the difference of all angles from the target reconstruction angle (preferably the so-called RMS radius). This can then be compared with the acceptance angle spectrum, for example.

The fact that the angle(s), the centroid angle and/or the angular spectrum of the full-surface hologram illumination and the reconstruction angle and/or the acceptance angle spectrum are matched to one another advantageously means that the angular spectrum and acceptance angle spectrum and/or centroid angle and reconstruction angle essentially or at least partially match.

The frequency spectrum of the illumination light and/or the maximum of the frequency spectrum of the illumination light and the acceptance frequency spectrum of the edge-lit hologram (preferably: the holographic structure) and/or the maximum of the acceptance frequency spectrum are matched to one another.

The frequency spectrum of the illumination light can be, for example, the spectral range of the emitted electromagnetic radiation, in which significant parts of the intensity of the emitted electromagnetic radiation are located. For example, substantial proportions may be 30% or more, 40% or more, 50% or more, 60% or more, 70% or more, 80% or more, or 90% or more.

The acceptance frequency spectrum is preferably described with regard to the spectral efficiency of the holographic structure, in particular the spectral decoupling efficiency. This preferably describes the decoupling efficiency in relation to the frequency spectrum of the light rays impinging on it. This efficiency can preferably assume values between 0 (e.g. no light is coupled out) and 1 (all light is coupled out) for different frequencies of the light. In this case, the acceptance frequency spectrum is preferably defined in that the decoupling efficiency for the frequency range covered is 0.1 or greater, more preferably 0.5 or greater.

The at least one maximum of the frequency spectrum preferably includes the at least one frequency and/or the at least one frequency range which has the maximum intensity within the frequency spectrum of the illumination light.

The at least one maximum of the acceptance frequency spectrum preferably designates the at least one frequency or the at least one frequency range within the acceptance frequency spectrum at which the efficiency of the holographic decoupling structure is greatest.

The fact that the frequency spectrum and/or the maximum of the frequency spectrum of the illumination light and the acceptance frequency spectrum and/or the maximum of the acceptance frequency spectrum are matched to one another advantageously means that the frequency spectrum and acceptance frequency spectrum and/or the maximum of the frequency spectrum and the maximum of the acceptance frequency spectrum essentially or at least partially match.

The holographic structure can be set up for the diffraction of different angle spectra and/or spectral ranges. For example, a number of holographic structures can be included, each of which diffracts an angle spectrum and/or a spectral range. These holograms can be arranged one above the other, in particular stacked one above the other, in a so-called stack, with these holographic structures preferably being essentially congruent.

In an alternative embodiment, the hologram areas assigned to the respective angle spectra and/or spectral areas are present in a single holographic structure, in particular in the form of a so-called hologram film, in which they were exposed together. Such a holographic structure is preferably also referred to as a so-called multiplex hologram.

The fact that the lighting arrangement is set up to illuminate the light coupling surface for irradiating illumination light into the edge-lit hologram through the light coupling surface preferably means that the light emitted by the lighting arrangement is emitted in the direction of the edge-lit hologram in such a way that a predominant or at least one significant part of the emitted radiation reaches the light coupling surface. For example, a main beam direction of Lighting arrangement be oriented in the direction of the light source.

A predominant part preferably comprises at least 50% of the light emitted by the lighting arrangement, in particular its intensity. A significant part preferably comprises at least 20%, more preferably at least 30% and especially at least 40% of the emitted light, preferably its intensity.

A main beam direction is preferably a direction in which there is a maximum intensity of the light beam or an intensity that is averaged over all directions. The term main ray or main ray direction preferably designates the central ray of a bundle of rays or its direction. The direction of the principal ray indicates in particular the direction of the bundle of rays. In the case of a collimated beam of rays, the other rays of the beam of rays run essentially parallel to the main beam direction, so that the main beam direction is preferably representative of the rays of a beam of rays. In the case of a non-collimated bundle of rays, the rays of the bundle of rays span a defined solid angle, in the center of which runs the main direction of radiation.

Since the light coupling surface is arranged on a transversal edge area of the Edge-Lit hologram and the lighting arrangement on the central axis, the lighting arrangement will preferably have a beam direction which has an angle or an angular spectrum obliquely to the central axis in order to optimally illuminate the light coupling surface.

It can also be preferred that the light coupling surface has areas which lie in different transverse/radial directions to the central axis and/or are arranged along different, non-parallel tangents to a circle around the central axis. It can therefore be preferred that the lighting device is set up for splitting, widening and/or reshaping the beam in a number of directions, e.g. B. several main beam directions to illuminate these respective areas. Depending on how many different areas are to be illuminated, it may no longer make sense to speak of a plurality of main beam directions when there are a large number of different directions in which the lighting arrangement emits the light, but only of a plurality of directions. As an example, an embodiment with a ring-shaped light-coupling surface encircling the Edge-Lit hologram and an illumination arrangement comprising an axicon is mentioned. This embodiment is described in more detail below.

The fact that the lighting arrangement is set up for illuminating the light coupling surface for irradiating illumination light into the edge-lit hologram through the light coupling surface preferably means that the lighting arrangement is set up for decentralized lighting. This means in particular that the illumination light does not essentially strike the edge-lit hologram with a central main beam direction along the central axis and then only strikes the transverse edge area to a small extent and is coupled in there, but that the illumination light essentially in one of The beam direction deviating from the central direction reaches the Edge-Lit hologram and in particular its light coupling surface. The fact that the lighting arrangement is set up for illuminating the light coupling surface for irradiating illumination light into the edge-lit hologram through the light coupling surface means in particular that the lighting arrangement is set up to essentially maximize the intensity radiated through the light coupling surface for a given emission intensity of the light source.

The lighting device is preferably set up for decentralized lighting, for example as described above.

With the present invention, the limitations of the prior art can be overcome and a compact device with improved display properties that is specially adapted to the required installation space can thus be implemented. Advantageously, no disturbing zeroth diffraction order is diffracted in the direction of an observer by the device and at the same time the hologram area can be kept as large as possible, with compact dimensions at the same time.

In a further preferred embodiment of the invention, the lighting arrangement has at least one light source and preferably at least one optical component.

The light source can e.g. B. include at least one LED and / or at least one laser. The light source preferably emits light in the visible spectrum, in particular between 380 nanometers (nm) and 780 nm based on the wavelength of the light. The light source can preferably be switched on and off and has a corresponding electrical connection option for an electrical energy source.

The light source preferably does not include a separate beam-shaping component, e.g. B. no lens.

However, it can also be preferred that the light source comprises at least one beam-shaping component, for example at least one lens.

The light source preferably has a main radiation direction along and/or parallel to the central axis in the direction of the edge-lit hologram.

However, the light source can also have a main radiation direction in the direction of the coupling surface. A further optical component, in particular for beam deflection, can then advantageously be dispensed with.

In a preferred embodiment of the invention, the light source comprises at least one LED. LEDs are particularly simple, durable and inexpensive and have sufficient optical properties, in particular with regard to their coherence, with regard to a large number of lighting functions, in particular holographic lighting functions. LEDs are particularly efficient.

LED emitters preferably have dimensions between 0.5×0.5 mm ² and 1×1 mm ² . In general, one can say that smaller emitter areas are always advantageous for our application.

In particular, exactly one LED is included. This keeps the structure simple and compact.

However, several LEDs can also be included. These can have different spectral ranges, for example. For example, different colored lighting functions can be implemented, depending on the LED switched on and the spectral range/acceptance frequency spectrum of the holographic structure. In particular, it is an RGB LED (RGB=Red/Green/Blue) which has one or more emitters for R, G and B, which can preferably (if there are several emitters) be driven individually. For example, it can be an Osram MULTILED LRTB GVSG, which emits at 625 nm (red), 528 nm (true green), 460 nm (blue). For example, intensities can be 500 - 1000 milli-candela (mcd) for red, 1250 - 2010 mcd for green and 180 - 560 mcd for blue. In the case of LEDs which essentially have the same spectral range, a particularly high luminous intensity can be realized in a particularly simple manner by using a plurality of LEDs.

An optical component can preferably include a lens, for example for beam collimation and/or an element for beam deflection or deflection.

In a preferred embodiment of the invention, the optical axis of the illumination arrangement coincides with the central axis. In this way, a particularly (optically) simple structure can be implemented.

The optical axis is preferably an imaginary line of symmetry in an optical structure. For example, the optical axis runs through the centers of curvature of lenses and mirrors and/or is orthogonal to the remaining symmetry axes of the optical components and/or the light source. The optical axis is preferably the axis of rotational symmetry of the optical components and/or the light source or it is a line along which there is a certain degree of rotational symmetry in the optical system (preferably comprising the light source and/or optical components). Important reference points, particularly for geometric optics, lie on the optical axis. The optical axis may also preferably be an imaginary line in the optical system that defines the path that the light propagates through the system.

In a further preferred embodiment, the optical axis of the light source coincides with the central axis. The optical axis of the light source is preferably an axis of rotational symmetry of the light source. In particular, the optical axis of the light source is a line along the main radiation direction of the light source.

In a further preferred embodiment of the invention, the optical component is set up for beam shaping of the illumination light of the illumination arrangement, in particular for at least partial collimation. This can be a collimating lens, for example. In this way, an improved quality of the hologram illumination and thus of the holographic lighting function can be implemented.

In a further preferred embodiment of the invention, the optical component is set up for beam deflection of the illumination light of the illumination arrangement in the direction of the light input surface, preferably from the direction along the optical axis and/or the central axis in the direction of the light input surface.

The light source preferably has an optical axis along the central axis or emits with a main beam direction along the optical axis. In order to maximize the illumination of the light coupling surface as described above, the illumination light must therefore preferably be deflected so that it radiates more in the direction of the light coupling surface. This is realized in particular by the optical component, which is set up for beam deflection. The beam deflection can be implemented using the means known to those skilled in the art, which are based on refraction, diffraction and/or reflection. For example, a mirror and/or a refractive optical element (e.g. prism) can be used for beam deflection.

Advantageously, the beam deflection also includes further beam shaping and/or beam path splitting. On the one hand, this can be desirable in order to adapt the cross-sectional area and/or cross-sectional shape of a beam or bundle of rays of the illuminating light to a shape and/or area of a light coupling surface, e.g. B. to maximize the irradiated intensity. On the other hand, a division can be particularly advantageous if more than one light coupling surface is included and/or areas of the light coupling surface that are present on different sides of the edge area are included.

The beam deflection is preferably optimized in such a way that the beam deflection generates beams of rays in different radial directions as viewed from the central axis. In addition, the beam deflection can also generate beams of rays which assume different angles with the central axis, depending on the position of the area of the light coupling surface to be illuminated in each case.

In a further preferred embodiment of the invention, the optical component is set up for beam shaping of the illumination light of the illumination arrangement and for beam deflection of the illumination light of the illumination arrangement in the direction of the light coupling surface. A combination of these two functions in the at least one optical component of the lighting arrangement is particularly advantageous.

In a further preferred embodiment of the invention, the light input surface is preferably a light input surface that runs at least partially around the edge area of the Edge-Lit hologram, wherein the light input surface preferably has areas oriented differently in the direction of the lighting arrangement and/or wherein the light input surface preferably has a substantially ring-shaped edge -Lit hologram surrounding light coupling surface is.

A light coupling surface that at least partially surrounds the Edge-Lit hologram surrounds the Edge-Lit hologram preferably along at least 40% of the transversal edge that encloses the Edge-Lit hologram, somewhat more preferably at least 50%, more preferably at least 60%, even more preferably at least 70%, even more preferably at least 80% and especially at least 90%.

A light coupling surface, which surrounds the Edge-Lit hologram along 50% of the transversal edge, is present, for example, in the transversal edge area along half the length of the transversal edge, the length of the transversal edge being the length of the section that the edge -Lit hologram once completely encircles the transversal edge.

Most preferably, the light coupling surface runs around the edge-lit hologram completely or 100% along the transversal edge.

Such a light coupling surface can preferably keep the light coupling surface relatively large, but without reaching too far into a central area of the surface of the edge-lit hologram and thus impairing the lighting function in the central area. For example, the light coupling surface can occupy a narrow area from the transversal edge in the direction of the center of the edge-lit hologram, but at the same time be large enough overall in terms of surface area for sufficient irradiation of illumination light by completely encircling the edge-lit hologram.

The fact that the light input surface has regions oriented differently in the direction of the lighting arrangement preferably means that the surface normals are not parallel and in particular are at least partially oriented in the direction of the lighting arrangement, especially in the direction of the beam-deflecting optical component. In this way, preferably with a light in-coupling surface that is circumferential at least in some areas, the amount of irradiation of the light can be further improved.

Preferably, it is a light coupling surface that surrounds the edge-lit hologram in an essentially ring-shaped manner. This is advantageous above all in the case of an essentially disc-shaped edge-lit hologram, as can be used, for example, in the case of a cylindrical or rotationally symmetrical lighting device (see below).

In a further preferred embodiment of the invention, the optical component is set up for simultaneous beam deflection in different directions, preferably for simultaneous coupling into areas of the light coupling surface that are oriented differently in the direction of the lighting arrangement.

Different directions preferably include non-parallel directions. In particular, parallel directions are not considered to be different directions. In the case of an annular light coupling surface, for example, different ring sections would lie in different directions as seen from the optical component arranged on the central axis or the illumination arrangement, which is why the beam deflection in different directions makes sense. This can advantageously be achieved by beam shaping and/or beam path splitting. In this case, the optical component is advantageously set up such that the areas of the light coupling surface lying in different directions are illuminated as homogeneously as possible. For example, ring sections that correspond to one another, that is to say in particular ring sections of the same size, are to be illuminated with essentially the same intensity in each case.

Since regions of the light coupling surface which are in different directions as seen from the lighting arrangement are preferably oriented in the direction of the lighting arrangement in order to improve the irradiation, they are oriented differently, so to speak, ie in particular do not have any parallel surface normals. The fact that the optical component is set up for beam deflection in different directions for simultaneous coupling into areas of the light coupling surface oriented differently in the direction of the lighting arrangement preferably means that the beam deflection is optimized with regard to the orientation of the respective area of the light coupling surface. The simultaneous beam deflection in different directions can, for example, include different directions that are transverse to the respectively illuminated area of the light coupling surface.

In a further preferred embodiment of the invention, the Edge-Lit hologram is set up to generate the holographic lighting function when the hologram is illuminated from different directions, preferably by illumination light radiated into differently oriented areas of the light coupling surface. Here, hologram illumination from different directions preferably means that the hologram illumination has components whose projection onto the surface of the edge-lit hologram has different, non-parallel directions. This is preferably due to the differently oriented areas of the light coupling surface. For example, in the case of an annular light coupling surface, the projection of the light beams within the surface of the edge-lit hologram can have different radial directions, for example in relation to the point of intersection of the edge-lit hologram with the central axis. The Edge-Lit hologram, in particular the holographic structure, must therefore be exposed to such radiation from different, e.g. B. radial directions may be suitable to generate the lighting function for this illumination light. This can be realized, for example, by appropriate exposure of the holographic structure during its production and/or by an appropriate computer-implemented method in the case of a computer-generated hologram. The exposure can take place, for example, in a setup that essentially corresponds to the later setup in which the hologram is reconstructed.

It may be preferable here to locally reduce the diffraction efficiency of the holographic structure in an area of the edge-lit hologram, in particular in an area of the holographic structure, so that light beams impinging there from different directions do not produce a locally brighter spot, for example. This can be the case, for example, with an annular light coupling surface in the area of the intersection of the edge-lit hologram with the central axis.

In a further preferred embodiment of the invention, a ratio of a first spatial extent of the lighting device along the central axis to a second spatial extent transverse to the central axis is at least 2:1. The second spatial extent preferably uses the longest extent in the transverse direction, since the transverse extent can vary at different points along the axis. In particular, the lighting device is elongate, with the length defined along the central axis and the width perpendicular thereto. There is preferably a ratio of length to width of 2 to 1. Such a device is particularly well suited for installation in which little space is available, for example in a vehicle.

In a further preferred embodiment of the invention, the holographic lighting device has a substantially rotationally symmetrical shape with an axis of rotation that corresponds to the central axis. A rotationally symmetrical embodiment is particularly useful in combination with an annular light coupling surface, offers inherent advantages in terms of components that can be used and the quality of the lighting due to the rotational symmetry, and is particularly easy to manufacture.

In a further preferred embodiment of the invention, the holographic lighting device is essentially cylindrical in shape with a cylinder axis corresponding to the central axis. The cylindrical embodiment is preferably a special embodiment of the rotationally symmetrical embodiment. In this case, the lighting device can preferably comprise a cylindrical housing. A housing is preferably a mechanically stable housing, for example made of metal or plastic, which is suitable in terms of dimensions to accommodate all the essential elements of the device inside. Even if the individual elements of the lighting device do not necessarily all have the same diameter (e.g. the light source can have a significantly smaller diameter than the edge-lit hologram), a cylindrical housing can have the same diameter throughout. Such a housing can then, for example, facilitate the installation of the device.

In a further preferred embodiment, the lighting device has an essentially rectangular outline perpendicular to the central axis. This preferably means that some or all elements of the device have a substantially rectangular outline in the plane perpendicular to the central axis. Such elements are particularly simple and standard components can be used.

In such an embodiment, the light coupling surface is preferably arranged along an edge of the rectangular transverse edge of the edge-lit hologram (see e.g. 3 ). However, it can also be preferred to arrange multiple areas of the light coupling surface along two, three or all four different edges of the rectangular, transversal edge of the edge-lit hologram.

In a further preferred embodiment of the invention, the holographic lighting device is essentially cuboid in shape, preferably with one long side which is essentially parallel to the central axis. In this case, the lighting device can preferably comprise a cuboid housing. Even if the individual elements of the lighting device do not necessarily all have the same diameter (e.g. the light source can have a significantly smaller diameter than the edge-lit hologram), a cuboid housing can have the same diameter throughout. Such a housing can then, for example, facilitate the installation of the device.

Such a device is particularly well suited for standardized installation spaces, which are often cuboid. Likewise, the components of such a device are particularly simple and inexpensive.

In a further preferred embodiment of the invention, the optical component comprises a lens. A lens is particularly well suited for beam shaping, in particular for collimation.

In a further preferred embodiment of the invention, the lens comprises a spherical lens, an aspherical lens, a cylindrical lens and/or a free-form lens.

A cylindrical lens is in particular an optical lens with an at least partially cylindrically shaped surface. In this case, a cylindrical lens preferably has a surface on at least one side of the lens, the shape of which corresponds to part of a lateral surface of a cylinder. Light is preferably only refracted in one dimension by a cylindrical lens. Therefore, a cylindrical lens can preferably be used for collimation in one direction.

In a further preferred embodiment of the invention, the optical component comprises an axicon and/or at least one prism-shaped element.

An axicon is preferably a conically ground optical element, e.g. B. a conically ground lens. An axicon preferably generates a ring-shaped beam profile or a ring-shaped light distribution, which is laterally constant over a certain range, in particular along the optical axis. This advantageously results from the generation of (preferably substantially non-diffractive) Bessel-like beams.

An axicon can advantageously be both convex and/or concave and can be made of conventional optical materials. The designation “concave” or “convex” preferably refers to the shape of at least one side of the axicon facing the light source and/or the edge-lit hologram towards the outside, in particular to the shape of the surface of the axicon towards the outside, where the terms “concave” or “convex” have the usual meaning for a person skilled in the art with regard to the surface quality of this at least one side.

The outer surfaces of the axicon preferably act in such a way that the light beams to be deflected act in such a way when entering the light-guiding body and when exiting the light-guiding body be broken that the desired beam deflection is realized.

However, it can also be preferred that the beam deflection of the axicon functions essentially through a total reflection at the appropriate angle within the light-conducting body of the axicon. For this purpose, the axicon can have a corresponding outer surface on which the light beams are correspondingly totally reflected. For example, with such an axicon, a preferably conical section, which preferably forms a concave surface of the axicon, points in the direction of the edge-lit hologram (cf. e.g. 10-12 ). This results in a total reflection at the concave surface, preferably within the light guide body of the axicon, and as a result, in a beam deflection of the illumination light in the direction of the light coupling surface of the Edge-Lit hologram.

The axicon can advantageously be used to illuminate the ring-shaped light coupling surface for irradiating illumination light into the edge-lit hologram through the light coupling surface. In this case, in particular, a simultaneous beam deflection in different directions can be realized, in which, in particular, a simultaneous coupling in of regions of the light coupling surface oriented in different directions of the lighting arrangement is realized. Advantageously, the axicon can be used to homogeneously radiate light into different areas or sections of an annular light coupling surface.

A prismatic element preferably has the shape of a prism. A prism is preferably a geometric body that can be described in space by a parallel displacement of a planar polygon along a straight line that does not lie in this plane. The polygon is preferably described as the base area and the opposite side area as the cover area. The remaining side surfaces are preferably referred to in their entirety as the lateral surface.

A prismatic element is in particular an element which comprises the shape of an optical prism. An optical prism is preferably understood to mean a body in the form of a prism, which is preferably used as a dispersive element or for deflecting a light beam. It is often a right prism with a triangle as its base. The prismatic element may have a polygonal prismatic shape comprising a prismatic body having a triangle as its base, at least two sides of the triangle participating in the formation of the outer surface of the body. These sides then preferably contribute to the desired beam shaping, the shaping overall deviating from a shape with a triangle as the base area, for example for practical reasons. A preferred variant is the combination of a prism with a triangle as the base and a cuboid in a monolithic component to form a polygonal prism-shaped element (see Fig. ). A prism-shaped element can preferably be used to deflect the beam along one direction, for example by arranging the prism-shaped element in such a way that the light source or z. B. the lens incoming beam first strikes a surface that is essentially not perpendicular to the beam direction and experiences a first deflection in a first direction there due to refraction. When exiting the prism-shaped element, the refracted light beam hits, for example, a surface that is perpendicular to the original light beam, but not to the already diffracted light beam, which causes further refraction in the same direction (see e.g. ). This is particularly advantageous for a light coupling surface which essentially extends along a tangent to a circle around the central axis. An example is a substantially rectangular light coupling surface, which is arranged in the edge area of a substantially rectangular edge-lit hologram. Such a rectangular light coupling surface is preferably flat.

If an essentially rectangular edge-lit hologram has several areas of the light coupling surface along two, three or all four different edges of the rectangular, transversal edge of the edge-lit hologram (see above), then preferably several prism-shaped elements with the properties described can be combined into one (more complex) prism-shaped elements are also combined (e.g. in a monolithic component) which are arranged in the beam path of the rest of the lighting arrangement in such a way that (preferably identical) parts of the beam of rays are deflected in the different directions of the respective areas of the light coupling surface.

A prism-shaped element is preferably to be understood as at least one prism-shaped element.

Monolithic preferably means consisting of one piece or in one piece. In this case, monolithic can in particular mean manufactured from one piece (eg the raw material of the light-conducting body).

In a further preferred embodiment of the invention, the holographic lighting device is essentially rotationally symmetrical in shape with an axis of rotation which is the central one Axis corresponds, wherein the optical component comprises an axicon and preferably a spherical or aspherical lens, wherein the light coupling surface is annular in particular. This embodiment combines the advantages of a ring-shaped lighting device with an improved holographic lighting function.

In a further preferred embodiment, the lighting device has an essentially rectangular outline perpendicular to the central axis, the optical component comprising a prism-shaped element and preferably a cylindrical lens or a free-form lens, the light coupling surface having in particular at least one essentially rectangular area. A free-form lens can in particular be designed in such a way that it enables collimation in two directions that are essentially perpendicular to one another. This embodiment combines the advantages of a lighting device shaped in this way with an improved holographic lighting function.

In a further preferred embodiment of the invention, the optical component comprises a combination of axicon and lens in a monolithic component. The person skilled in the art knows how, using ray tracing or the like, he can implement a corresponding optical component which has both the desired beam-shaping properties of a lens and the beam-deflecting properties of an axicon.

In a further preferred embodiment of the invention, the light coupling surface is set up for beam shaping of the illumination light of the illumination arrangement, in particular for at least partial collimation. A person skilled in the art knows how to realize, e.g. shape, the light coupling surface, so that with a given beam profile of the light illuminating the light coupling surface, at least partial collimation can be realized, e.g. due to light refraction at the correspondingly shaped boundary surface, which is formed by the light coupling surface .

In the case of at least partial collimation, improved collimation can be achieved in combination with a beam-shaping optical component for collimation (eg lens). For example, residual errors in the collimation can be at least partially corrected by the optical component. Likewise, a beam-shaping component for collimation can possibly be dispensed with and a more compact and simpler lighting device can be implemented.

In a further preferred embodiment of the invention, the edge-lit hologram has a light-guiding body with the light-coupling surface and a holographic structure arranged along the transverse, two-dimensional extent, the edge-lit hologram being set up for essentially full-surface hologram illumination of the holographic structure under one Angle greater than the angle of total reflection in the fiber-optic element by illuminating light radiated into the light-coupling surface.

The light-guiding body is preferably flat along the flat extent of the edge-lit hologram. In particular, the outer dimensions of the light-guiding body essentially include the outer dimensions of the edge-lit hologram.

The light-guiding body of the edge-lit preferably comprises a hologram. This is achieved in particular in that the light-guiding body essentially forms the edge-lit hologram together with the holographic structure.

The light guide body preferably comprises a transparent substrate. The light-guiding body can, for example, comprise a transparent glass or PMMA substrate

The light-guiding body preferably also comprises at least one layer applied to the transparent substrate. In this case, the holographic structure is present in particular within the at least one layer. The at least one layer can be present on a side of the edge-lit hologram remote from the lighting arrangement or on a side close to the lighting arrangement.

The at least one layer preferably comprises one or more of the following layers: hologram layer, which preferably comprises the holographic structure (e.g. photopolymer layer), layer comprising triacetate, transparent adhesive layer or adhesive film (e.g. OCA) and/or layer/ Foil comprising polycarbonate (PC.) In particular, at least the hologram layer is comprised. The layer can in particular comprise a foil, e.g. B. a hologram film, a triacetate film, an adhesive film and / or a polycarbonate film.

The holographic structure may also include the holographic structure inside, e.g. B. as an introduced layer and / or as an introduced structure. The introduced layer can comprise at least one layer as described above.

The holographic structure can preferably comprise a reflection hologram. In this case, the illumination light that is internally reflected in the light-guiding body on the side of the light-guiding body remote from the lighting arrangement is preferably used diffracted by the reflection hologram and then coupled out of the light guide body from the side remote from the lighting arrangement in order to generate the lighting function. The reflection hologram can be present closer to the side of the light-guiding body remote from the lighting arrangement or closer to the side of the light-guiding body close to the lighting arrangement (closer preferably means closer than to the other side in each case). The reflection hologram can preferably also be present on or on the side closest to the lighting arrangement.

It can also be preferred that the light is guided directly from the light coupling surface to the reflection hologram without prior internal reflection in the light-guiding body (this preferably includes the case of only reflection at the deflection surface after the light has entered the light coupling surface, see below). The reflection hologram is then preferably arranged closer to the side closest to the lighting arrangement or on or on it.

The holographic structure can preferably comprise a transmission hologram. The illumination light reflected internally in the light-guiding body on the side of the light-guiding body close to the lighting arrangement is preferably diffracted by the transmission hologram and then decoupled from the light-guiding body on the side remote from the lighting arrangement in order to generate the lighting function. The transmission hologram can be present closer to the side of the light guide body remote from the lighting arrangement or closer to the side of the light guide body close to the lighting arrangement (closer preferably means closer than the respective other side). The transmission hologram can preferably also be present on or on the side remote from the lighting arrangement.

It can also be preferable for the light to be guided directly from the light coupling surface to the transmission hologram without prior internal reflection in the light-guiding body (this preferably includes the case of only reflection at the deflection surface after the light has entered the light coupling surface, see below). The transmission hologram is then preferably arranged closer to the side remote from the lighting arrangement or on or on it.

In a further preferred embodiment of the invention, the full-area hologram illumination of the holographic structure is realized by direct edge illumination without multiple reflections in the light guide body.

Direct edge illumination preferably refers to direct illumination of the holographic structure after irradiation through the light coupling surface after at most one internal reflection in the light-guiding body (plus, if necessary, a reflection on the deflection surface). Light coupling surface and any existing deflection surface (see below) are preferably counted to the “edge” of the Edge-Lit hologram, at whose transversal edge or edge area they are located. Such an illumination is therefore preferably referred to as direct edge illumination. Depending on the nature of the holographic structure (diffraction in reflection or transmission) and the location of the holographic structure (closer to or on one side or the other side of the light-guiding body), a single internal reflection in the light-guiding body may be desirable in order to reduce the diffraction of the holographic structure can be realized depending on the condition.

• - ist die holographische Struktur ein Transmissionshologramm, wird vorzugsweise das Licht ohne vorherige Reflektionen im Lichtleitkörper (bzw. lediglich an der Umlenkfläche) direkt von der Lichteinkoppelfläche auf das Transmissionshologramm geleitet und dann von diesem gebeugt oder
• - das Licht wird lediglich mit einer einzigen vorherigen Reflektion an der der Beleuchtungsanordnung nahliegenden Seite des Lichtleitkörper (bzw. zuzüglich einer Reflektion an der Umlenkfläche) auf das Transmissionshologramm geleitet und dann von diesem gebeugt
• - ist die holographische Struktur ein Reflektionshologramm, kann vorzugsweise das Licht ohne vorherige Reflektionen im Lichtleitkörper (bzw. lediglich an der Umlenkfläche) direkt von der Lichteinkoppelfläche auf das Reflektionshologramm geleitet und dann von diesem gebeugt werden oder
• - das Licht wird lediglich mit einer einzigen vorherigen Reflektion an der der Beleuchtungsanordnung fernliegenden Seite des Lichtleitkörper (bzw. zuzüglich einer Reflektion an der Umlenkfläche) auf das Reflektionshologramm geleitet und dann von diesem gebeugt.

There are preferably several cases:

• - If the holographic structure is a transmission hologram, the light is preferably conducted directly from the light coupling surface onto the transmission hologram and then diffracted or
• The light is directed onto the transmission hologram with only a single previous reflection on the side of the light-guiding body close to the lighting arrangement (or plus a reflection on the deflection surface) and is then diffracted by the latter
• - If the holographic structure is a reflection hologram, the light can preferably be passed directly from the light coupling surface onto the reflection hologram and then diffracted by it, without previous reflections in the light guide body (or only on the deflection surface).
• - The light is directed onto the reflection hologram with only a single previous reflection on the side of the light-guiding body remote from the lighting arrangement (or plus a reflection on the deflection surface) and then diffracted by it.

A particularly homogeneous hologram illumination can preferably be realized by direct edge illumination and the lighting function can thus be improved.

In a further preferred embodiment of the invention, the full-area hologram illumination of the holographic structure is provided by waveguide illumination with multiple reflections realized in the fiber optic body. The light-guiding body thus preferably functions in some areas as a waveguide for the light radiated into the light-coupling surface, before this light is at least partially diffracted out of the light guide by the holographic structure. Since the diffraction efficiency of the holographic structure is preferably not 100%, part of the light that hits the holographic structure is not diffracted, but continues to be guided in the light guide by reflection and can then again be reflected with a certain probability or probability the next time it hits the holographic structure. efficiency are bent. A large-area holographic structure can thus preferably be illuminated even with a small “thickness” of the light-conducting body. (Thickness preferably describes the extent of the light-guiding body perpendicular to its areal extent—e.g. along the central axis). Since, due to the finite diffraction efficiency <100%, the light intensity of the illumination light guided in the light-conducting body decreases after each impingement on the holographic structure, a homogeneous lighting function can preferably be realized by a diffraction efficiency of the structure running in the opposite direction. For example, the diffraction efficiency can increase as the distance to a light coupling surface increases.

In a further preferred embodiment of the invention, the light guide body has a central depression on the side close to the lighting arrangement, along which the holographic structure is arranged, with a connecting surface from a transverse edge to the depression at least partially encompassing the light coupling surface. The connecting surface thus preferably includes the transversal edge area. The fact that the holographic structure is arranged along the depression preferably means that the holographic structure is preferably essentially or at least partially congruent or congruent with the central depression. Congruent or congruent preferably means that they can be converted into one another by parallel displacement. The light coupling surface described here, which is encompassed by the connecting surface, is preferably a light coupling surface surrounding the edge-lit hologram.

In the case of the rotationally symmetrical device with an annular light in-coupling surface, the recess and the connecting surfaces together preferably have an essentially frustoconical shape.

This embodiment is particularly favorable in terms of manufacturing technology, since a monolithic light-guiding body can be realized in a particularly simple manner, primarily with a peripheral light coupling surface.

In a further preferred embodiment of the invention, a side surface of the light-guiding body, which connects the side of the light-guiding body that is close to the lighting arrangement and the side of the light-guiding body that is remote from the lighting arrangement, comprises a deflection surface for deflecting the incident illumination light, which is set up, together with the light coupling surface, to emit the hologram illumination through in to generate illumination light radiated onto the light coupling surface.

The side surface of the light-guiding body is preferably present at the transversal edge of the light-guiding body. Since the light in the light coupling surface preferably radiates into the light guide body from the direction of the illumination arrangement, the deflection surface is advantageously required in order to implement the hologram illumination. In this case, the deflection surface can preferably be mirrored, for example by applying a suitable layer or film, so that the light is reflected on it. At the same time, the deflection surface must preferably be arranged at a suitable angle on the edge-lit hologram so that the hologram illumination can be implemented as described herein. Depending on the angle between the illuminating light impinging on the light coupling surface and to be deflected and the deflection surface, a reflective layer can preferably be dispensed with if this angle is greater than the critical angle of total reflection and total reflection therefore occurs even without a coating.

The deflection surface can preferably be set up in such a way that incident illumination light is first totally reflected on the side of the light guide body remote from the illumination arrangement. It can also be preferred that the deflection surface is set up such that the incident illumination light is first totally reflected on the side of the light guide body that is close to the illumination arrangement. Which variant is selected can be selected, for example, depending on the nature and/or the arrangement of the holographic structure.

In a further preferred embodiment, a central screen is arranged on the side of the Edge-Lit hologram or light-guiding body close to the lighting arrangement, which is set up to prevent scattered light from entering the central area of the Edge-Lit hologram or light-guiding body.

In a further preferred embodiment of the invention is on the central axis between Arranged schen lighting arrangement and Edge-Lit hologram a switchable illuminated display element for a view of the remote side of the lighting arrangement of the Edge-Lit hologram visible illuminated display. In particular, the illuminated display element is arranged and/or dimensioned such that the illuminating light propagating from the illumination arrangement to the light coupling surface is essentially not shaded and/or impeded by the illuminated display element. A further display can be implemented by means of the illuminated display element. In this case, the holographic structure and/or the edge-lit hologram is essentially transparent to the light emitted by the illuminated display element. For example, the light-emitting display element can emit light in a spectral range and/or angular range for which the holographic structure is essentially transparent. The light-emitting display element preferably produces a light-emitting display which is visible when looking at the side of the edge-lit hologram remote from the lighting arrangement. In this way, two independent illuminated displays can be implemented, one via the illuminated Edge-Lit hologram and the other via the illuminated display element. For this purpose, the illuminated display element preferably comprises corresponding means, for example a light source, a beam-shaping element and/or a structure which is illuminated by the light source and which generates the display when illuminated. The illuminated display element, ie in particular the light source, can be switched on and off.

The light-emitting display element is preferably fastened with narrow webs to the side of the light-conducting body which is close to the lighting arrangement. However, the light display element can also be fixed, for example, on the central axis if it is a physical axis.

In this embodiment, there is either no central screen or the central screen is arranged closer to the lighting arrangement than the illuminated display element.

In a further preferred embodiment of the invention, the illumination arrangement and the edge-lit hologram comprise separate elements which are set up for a (preferably mutually) form-fitting arrangement along the central axis and/or for an arrangement with a flush transverse outer surface.

Such a device can be manufactured and assembled in a particularly simple manner and does not require any additional adjustment, which can normally be necessary in order to ensure a high optical quality of the lighting function. A simple exchange of individual elements can also be carried out.

The flush transverse outer surface is suitable for particularly easy installation. The resulting lighting device can be cylindrical or cuboid, for example.

In a further preferred embodiment of the invention, spacers are included in the transversal edge area between elements of the lighting arrangement and/or between lighting arrangement and Edge-Lit hologram for a defined distance arrangement of the elements to one another, which are set up for a form-fitting arrangement along the central axis together with the elements .

In this embodiment, the elements can preferably not be arranged positively on their own, but only together with the spacers.

The spacers allow the simple assembly from the previous embodiment to be combined with greater flexibility in the construction of the lighting device. In this case, each element and each spacer is advantageously a compact element that is easy to replace.

The spacers are preferably also set up for assembly/arrangement along the central axis together with the separate elements in a stack and preferably flush in the transverse edge region.

In a second aspect, the invention relates to an illumination arrangement and/or elements of an illumination arrangement for a holographic lighting device described here according to the embodiment described above with individual elements with or without spacers.

It is obvious to a person skilled in the art that advantages, definitions and embodiments of the device according to the invention according to the first aspect also apply to the device according to the invention according to the second aspect as claimed.

In a third aspect, the invention relates to an edge-lit hologram for a holographic lighting device described here according to the embodiment described above with individual elements with or without spacers.

It is obvious to a person skilled in the art that advantages, definitions and embodiments of the device according to the invention according to the first and/or second aspect also apply to the claimed invention according to the third aspect apply to the device according to the invention.

In a fourth aspect, the invention relates to spacers for a holographic lighting device described here.

It is obvious to a person skilled in the art that advantages, definitions and embodiments of the device according to the invention according to the first, second and/or third aspect also apply to the claimed device according to the invention according to the fourth aspect.

Description of the invention:

• 1 zeigt eine Seitenansicht der holographische Leuchtvorrichtung in der rotationssymmetrischen Ausführungsform.
• 2 zeigt eine perspektivische Ansicht der holographischen Leuchtvorrichtung in der rotationssymmetrischen Ausführungsform.
• 3 zeigt perspektivisch und schematisch eine Ausführungsform der Leuchtvorrichtung mit eine rechteckigen Umrissform.
• 4 zeigt eine Ausführungsform mit einer optischen Komponente, welche eine Kombination eines Axicons und einer Linse in einem einzigen, monolithischen Bauteil aufweist.
• 5 zeigt eine Seitenansicht der rotationssymmetrischen Ausführungsform mit einer Simulation der Lichtstrahlen.
• 6 zeigt perspektivischen Ansicht der rotationssymmetrischen Ausführungsform mit einer Simulation der Lichtstrahlen.
• 7 zeigt eine Simulation der örtlichen Beleuchtungsstärke (Einheit „Lux“) der vollflächigen Hologrammbeleuchtung.
• 8 zeigt die Leuchtvorrichtung bei der Lichtquelle, Linse, Axicon und Edge-Lit-Hologramm als separate Elemente realisiert sind und gemeinsam mit den ebenfalls gezeigten Abstandshaltern formschlüssig angeordnet werden können.
• 9 zeigt eine Ausführungsform der Leuchtvorrichtung mit einem schaltbaren Leuchtanzeigenelement.
• 10 zeigt eine Ausführungsform der Leuchtvorrichtung, in der das Axicon in Totalreflektion funktioniert.
• 11 zeigt die in 10 besprochene Ausführungsform der Leuchtvorrichtung in einer perspektivischen Seitenansicht.
• 12 zeigt die dem Edge-Lit Hologramm zugewandte Seite des Axicons gemäß der Ausführungsform von 10.

The invention is to be explained below with reference to further figures and examples. The examples and figures serve to illustrate preferred embodiments of the invention without restricting them.

• 1 shows a side view of the holographic lighting device in the rotationally symmetrical embodiment.
• 2 shows a perspective view of the holographic lighting device in the rotationally symmetrical embodiment.
• 3 shows in perspective and schematically an embodiment of the lighting device with a rectangular outline shape.
• 4 Figure 1 shows an embodiment with an optical component having a combination of an axicon and a lens in a single, monolithic part.
• 5 shows a side view of the rotationally symmetrical embodiment with a simulation of the light rays.
• 6 shows a perspective view of the rotationally symmetrical embodiment with a simulation of the light rays.
• 7 shows a simulation of the local illuminance (unit "lux") of the full-surface hologram illumination.
• 8th shows the lighting device in which the light source, lens, axicon and edge-lit hologram are realized as separate elements and can be arranged in a form-fitting manner together with the spacers also shown.
• 9 shows an embodiment of the lighting device with a switchable light display element.
• 10 Figure 12 shows an embodiment of the lighting device in which the axicon works in total reflection.
• 11 shows the in 10 discussed embodiment of the lighting device in a perspective side view.
• 12 12 shows the edge-lit hologram side of the axicon according to the embodiment of FIG 10 .

1 shows a side view of the holographic lighting device 1 in the rotationally symmetrical embodiment with an illumination arrangement 3 comprising as components in addition to the light source 5 as optical components 7 both a lens 9 for beam shaping and an axicon 11 for beam deflection of the illumination light in the direction of the light coupling surface 13. The edge Lit hologram 15 has an optical fiber 17 and the holographic structure 19 which, as shown here, can be present on side 33 of edge-lit hologram 15 that is remote from the lighting arrangement or on side 23 that is close to the lighting arrangement. Both the components of the lighting arrangement 3 and the edge-lit hologram 15 are arranged along the central axis 21 .

The light-guiding body 17 of the edge-lit hologram 15 has a central depression 25 on the side 23 close to the lighting arrangement 3, to which the holographic structure 19 is arranged congruently, the connecting surface 12 from the transversal edge 27 to the depression 25 comprising the light coupling surface 13. This connecting surface 12, which includes the light coupling surface 13, at least partially encompasses the transversal edge region 49. This light coupling surface 13 surrounds the edge-lit hologram 15 in a ring and has regions oriented differently in the direction of the lighting arrangement, e.g. 29 and 31, which are opposite one another and are therefore tilted differently are in order to point in the direction of the illumination arrangement 3 and to improve irradiation of the illumination light. In this embodiment, the differently oriented areas merge smoothly into one another; it is a curved, continuous and ring-shaped light input surface 13 with areas that continuously change the “orientation” (tilting). A side surface 35 connecting the side 33 of the light guide body 17 that is remote from the lighting arrangement 3 and the side 23 of the light guide body 17 that is close to the lighting arrangement 3 comprises a deflection surface 37.

The optical axis 39 of the lighting arrangement 3 coincides with the central axis 21 of the device 1 . Emitted illuminating light 41 of the light source 5 is emitted along the central axis 21 as a diverging light beam and is collimated by the lens 9 parallel to the central axis 21 . Through the axicon 11, the collimated lighting direction light 43 is divided or deflected in several directions, so that the light coupling surface 13 is illuminated, which is ring-shaped as described above and thus has areas which are arranged in different directions transverse to the central axis 21 (see also 2 ) and are oriented differently in the direction of the lighting arrangement 3 . The axicon 11 can advantageously implement an annular, uniform division or deflection of the illumination light (see deflected illumination light 45), so that an essentially homogeneous or even illumination of the different areas of the light coupling surface 13 is achieved. The axicon 11 shown is a concave axicon 11 since the surface of the axicon 11 oriented toward the light source 5 is concave in shape. The illumination light is radiated into the light coupling surface 13 by this illumination. The incident illumination light is deflected by the deflection surface 37, which is, for example, mirrored, so that the holographic structure 19 is illuminated over the entire surface (hologram illumination). The deflection is such that the light propagates at an angle greater than the angle of total reflection in the light-guiding body 17 and would therefore not be decoupled from the light-guiding body 17 without the diffraction by the holographic structure 19 . The holographic structure 19 bends the light in such a way that it is coupled out on the side 33 of the light guide body 17 remote from the lighting arrangement and the holographic lighting function is thus visible when viewing this side 33 remote from the lighting arrangement. Due to the total reflection, undiffracted light remains in the light guide body 17.

In the case shown, the holographic structure 19 is realized by waveguide illumination with multiple reflections in the light guide body 17, the illumination light being totally reflected along both sides 23 and 33 of the light guide body 17 and diffracted by the holographic structure 19 with a diffraction efficiency of less than one. Accordingly, after the light has impinged on the holographic structure 19, a part remains undiffracted in the light guide body 17 and can be diffracted by the holographic structure 19 after further reflections. The diffraction efficiency can be adjusted accordingly and varied over the surface of the holographic structure 19 in order to implement, for example as a holographic light function, a lighted display with a substantially constant brightness over the entire surface of the lighted display. The waveguide illumination of the hologram 19 shown is particularly suitable for illuminating a large-area holographic structure.

A screen 72 can be arranged centrally on the recess 25 for the lighting arrangement 3 and blocks scattered light from the lighting arrangement 3 shining centrally into the light guide body 17 .

2 shows a perspective view of the holographic lighting device 1 in the rotationally symmetrical embodiment. The light source 5 of the lighting arrangement 3 can be seen in perspective at the front in the figure, the lens 9 and then the axicon 11 are arranged next. The visible, conical section 47 of the axicon 11 is advantageous for the uniform and ring-shaped division and deflection of the illumination light, which is adapted to the ring-shaped light coupling surface 13 of the Edge-Lit hologram 15 at the rear in the figure.

In 2 the ring-shaped light coupling surface 13 is particularly clearly visible, which extends from the transversal edge 27 to the central recess 25 and, as it were, encompasses the transversal edge area 49 . Visible are the areas arranged in different transverse directions to the central axis, which are also oriented differently in the direction of the lighting arrangement (e.g. 29, 31) in order to facilitate the coupling of light.

3 shows a perspective and schematic embodiment of the lighting device 1 with a rectangular outline shape, in which a flat light coupling surface 13 is present only on one (here upper) side of the edge-lit hologram 15 . In addition to the light source, the lighting arrangement 3 consists of a cylindrical lens 51 and a prism-shaped component for beam deflection 53. All components are arranged on and along the central axis 21. The shape of the cylindrical lens 51 shown can at least realize collimation in the vertical direction. A lens would also be conceivable here, for example a free-form lens, which also implements collimation in the horizontal direction. The collimated illumination light 43 is then deflected by the prism-shaped component 53 in the direction of the light coupling surface 13 (deflected illumination light 45), radiated into the light guide body 17 through the light coupling surface 13 and correspondingly deflected by the deflection surface 37 on the side surface 35 for hologram illumination. In the embodiment shown, this involves waveguide lighting with multiple reflections in the light-guiding body.

4 shows an embodiment with an optical component 7, which is a combination of an axicon for annular beam deflection or splitting and a lens for collimation in a single, monolithic component 55 has. This embodiment otherwise corresponds mutatis mutandis to 1 and 2 embodiments shown.

5 and 6 show in a side view ( 5 ) and a perspective view ( 6 ) once again the rotationally symmetrical embodiment of the lighting device 1 with axicon 11. A ray tracing simulation was carried out in order to simulate the light beams of the illumination light. In particular, the uniform, ring-shaped deflection of the light beams 45 by the axicon 11 and the resulting uniform irradiation into the ring-shaped light coupling surface 13 of the edge-lit hologram 15 can be seen.

7 shows a simulation of the local illuminance (unit "lux") of the full-surface hologram illumination in the case of the above 1 , 2 , 5 and 6 described, rotationally symmetrical embodiment. Lux is preferably the SI unit of illuminance. The Lux unit of measure is preferably defined as the photometric illumination produced by a luminous flux of 1 lumen (Im) when evenly distributed over an area of 1 square meter. The scale on the left of the figure enables the graphically different levels of illuminance to be assigned to a specific value. The length of the displayed bars of the graphically different illuminances preferably indicates the frequency of the respective measured illuminances per unit area on a logarithmic scale. It can be seen that a homogeneous illumination can be achieved in large parts of the hologram area. Only in the center of the illuminated holographic structure 19 is the illuminance significantly greater for geometric reasons, because the illuminating beams from different directions overlap here. This could be compensated, for example, by a locally adapted diffraction efficiency of the holographic structure 19 in order to implement a uniformly bright holographic lighting function.

8th shows the lighting device 1 with a rotationally symmetrical shape in a cross-sectional view, in which the elements of the lighting arrangement 3, ie in the case shown light source 5, lens 9, axicon 11 and edge-lit hologram 15 are realized as separate elements. Spacers 57, 59 and 61 are included between the individual elements. Spacers 57, 59 and 61, as well as the separate elements except for light source 5, are shaped to fit positively and with a flush transverse outer surface 63 as shown. The arrangement of the elements can, for example, also be described as stacked, although "stacked" does not refer to the direction of arrangement and the arrangement does not have to be "on top of each other" with an orientation along a vertical reference direction, but also in the horizontal direction, as in the case shown can. In the example shown, the optical elements 9 and 11 are disc-shaped at least in the transversal edge region 65 and 67 and have the same outer diameter. The spacer 57 lying between the light source 5 and the lens 9 and the spacer 59 lying between the lens 9 and the axicon 11 are ring-shaped and both have the same outer diameter as the lens 9 and the axicon 11 . The optically relevant surfaces of the lens 9 and the axicon 11 are realized centrally at a distance from the transverse edge of the respective elements in order to ensure the optical path within the inner diameter of the annular spacers 57 and 59. The transversal edge regions of lens 65 and axicon 67 are not used optically in the example shown and can have other optical and/or other material properties than the central surfaces of lens 9 and axicon 11.

In the example shown, the Edge-Lit hologram 15 is also disc-shaped, but has a slightly smaller outer diameter than the optical elements 9, 11 and the spacers 57, 59. However, the spacer 61 between the axicon 11 and the Edge-Lit hologram 15 has the outer diameter of the other components mentioned and is shaped towards the inside in such a way that the disc-shaped Edge-Lit hologram 15 can be accommodated in a form-fitting manner.

Due to this form-fitting and externally flush arrangement of the components of the lighting device 1, a simple installation with a defined spacing and a lighting device 1 that is compact and easy to install overall can be implemented. The individual components can be connected by suitable connecting means, e.g. by mechanical connecting means such as screws, nails and/or clamps and/or by chemical connecting means such as e.g. B. glue are connected.

9 1 shows an embodiment of the lighting device 1 in which a switchable illuminated display element 69 is arranged on the central axis 21 between the lighting arrangement 3 and the edge-lit hologram 15 . This allows a switchable light display to be implemented independently of the holographic light function, which is visible by looking at the side of the edge-lit hologram 33 that is remote from the lighting arrangement 3 . The switchable indicator light Gene element 69 can, for example, comprise an LED, which illuminates a corresponding illuminated display and thus enables symbols to be displayed. The light display element can also include a transparent, colored housing 70, which enables a correspondingly colored light function by switching on the LED. The colors of the light display can be selected in almost any way. Preferably, only the spectrum should be matched to the spectral and angle-dependent diffraction efficiency of the holographic structure 19 in such a way that the light 71 of the illuminated display element 69 can shine through the holographic structure 19 essentially unhindered.

10 shows a (rotationally symmetrical) embodiment of the lighting device 1 in which the axicon 11 functions in total reflection. In principle, it is an "inverted" axicon according to the previously shown embodiments. In this axicon 11, the conical section 47, which forms the concave surface, points in the direction of the edge-lit hologram 15. This results in a total reflection on the concave surface within the light-conducting body 73 of the axicon and, as a result, in a beam deflection of the Illumination light in the direction of the light coupling surface 13.

In the embodiment of the axicon 11 shown, the decoupling surface 74 of the axicon is shaped in such a way that the deflected beams 45 strike it perpendicularly and are not deflected any further. However, it could also be the case that the decoupling surface 74 of the axicon alone and/or in conjunction with the light coupling-in surface 13 realizes a beam deflection and/or beam shaping, which is helpful for a desired hologram illumination. However, for manufacturing and assembly reasons, it is advantageous to use as few optically active surfaces of the various elements as possible.

In the embodiment shown here, at least the axicon 11 and the edge-lit hologram 15 are implemented as separate elements, which are, however, set up for a positive arrangement along the central axis and with a flush transverse outer surface. An air gap can therefore be present here between the coupling-out surface of the axicon 74 and the light coupling-in surface 13 . In principle, it would also be conceivable to have an edge-lit hologram 15 and axicon 11 that are monolithic or subsequently positively connected (e.g. glued or mechanically connected) to one another, in which a light coupling surface of the edge-lit hologram is then attached to an inner transition surface between Axicon 11 and Edge-Lit hologram 15 could be defined. In terms of production technology, the realization as separate elements has advantages in any case.

The holographic structure 19 is illuminated here as direct edge illumination. As a result, a particularly good quality of the lighting function can be achieved. In the example shown, this can be easily implemented due to the relative thickness of the edge-lit hologram 15 .

11 shows the in 10 discussed embodiment of the lighting device 1 with light source 5, lens 9, axicon 11 and edge-lit hologram 15 in a perspective side view.

12 shows the edge-lit hologram 15 facing side of the axicon 11 according to the embodiment of FIG 10 . The conical cutout 47 and the truncated cone-like decoupling surface 74 of the axicon can be seen.

Reference List

1

Holographic lighting device

3

lighting arrangement

5

light source

7

optical components

9

lens

11

Axicon

12

interface

13

light coupling surface

15

Edge lit hologram

17

fiber optic body

19

holographic structure

21

central axis

23

The side of the Edge-Lit hologram/light guide body closest to the lighting arrangement

25

Central deepening

27

Transverse edge of the Edge-Lit hologram/light guide

29

Area of the light coupling surface oriented in a first direction

31

Area of the light coupling surface oriented in a second direction

33

Side of the Edge-Lit hologram/light-guiding body remote from the lighting arrangement

35

Side surface of the Edge-Lit hologram/light guide body

37

deflection surface

39

optical axis

41

Emitted illuminating light

43

Collimated illuminating light

45

Deflected illumination light

47

Conical section of the axicon

49

Transverse edge area of the Edge-Lit hologram

51

cylindrical lens

53

Prism-shaped component for beam deflection

55

Combination of lens and axicon in one monolithic component

57

Spacer between light source and beam-shaping optical component (e.g. lens)

59

Spacer between beam-shaping optical component and beam-deflecting optical component (e.g. axicon)

61

Spacer between beam-deflecting optical component and Edge-Lit hologram

63

Transverse outer surface of the lighting device

65

Transverse edge of the lens

67

Transverse edge of the axicon

69

Switchable indicator element

70

Transparent and colored housing of the illuminated display element

71

Light of the switchable illuminated display element

72

Central aperture

73

light guide body of the axicon

74

Axicon decoupling surface

Claims (25)

Holographic lighting device (1) with a central axis (21) on which an edge-lit hologram (15) with a planar extension transverse to the central axis (21) and a lighting arrangement (3) for hologram lighting are arranged along the axis (21). are, wherein the Edge-Lit hologram (15) has a light coupling surface (13) on a transversal edge area (49) of the Edge-Lit hologram (15), wherein the edge-lit hologram (15) is set up for essentially full-surface hologram illumination at an angle greater than the angle of total reflection within the edge-lit hologram (15) by illumination light radiated into the light coupling surface (13), wherein the edge-lit hologram (15) is set up to generate a holographic light function when the hologram is illuminated, which is visible when viewing the side (33) of the edge-lit hologram (15) remote from the illumination arrangement, wherein the illumination arrangement (3) is set up for illumination of the light coupling surface (13) for radiating illumination light into the edge-lit hologram (15) through the light coupling surface (13). Holographic lighting device (1) according to the preceding claim, wherein the lighting arrangement (3) has at least one light source (5) and at least one optical component (7). Holographic lighting device (1) according to the preceding claim, wherein the optical component (7) is set up for beam shaping of the illumination light of the illumination arrangement (3), in particular for at least partial collimation. Holographic lighting device (1) according to the previous one claim 2 or 3 , wherein the optical component (7) is set up for a beam deflection of the illumination light of the illumination arrangement (3) in the direction of the light coupling surface (13). Holographic lighting device (1) according to one or more of the preceding claims, wherein the light coupling surface (13) is preferably a light coupling surface (13) running at least in regions along the edge region (49) of the edge-lit hologram (15), wherein the light coupling surface (13) preferably has areas (29, 31) oriented differently in the direction of the lighting arrangement (3) and/or wherein the light input surface (13) is preferably a light input surface (13) that essentially annularly surrounds the edge-lit hologram (15). Holographic lighting device (1) according to the previous ones claims 4 and 5 , wherein the optical component (7) is set up for simultaneous beam deflection in different directions, preferably for simultaneous coupling into areas (29, 31) of the light coupling surface (13) oriented differently in the direction of the lighting arrangement (3). Holographic lighting device (1) according to the preceding claim, wherein the edge-lit hologram (15) is set up in the hologram illumination from different directions, preferably through in different orientations Areas (29, 31) of the light coupling surface (13) irradiated illuminating light to generate the holographic lighting function. Holographic lighting device (1) according to one or more of the preceding claims, wherein a ratio of a first spatial extent of the lighting device along the central axis (21) to a second spatial extent transverse to the central axis (21) is at least 2 to 1. Holographic lighting device (1) according to one or more of the preceding claims, wherein the holographic lighting device (1) is essentially rotationally symmetrical in shape with an axis of rotation which corresponds to the central axis (21). Holographic lighting device (1) according to one or more of the preceding claims 3 - 10 , wherein the optical component (7) comprises a lens (9). Holographic lighting device (1) according to the preceding claim, wherein the lens (9) comprises a spherical lens, an aspherical lens, a cylindrical lens (51) and/or a free-form lens. Holographic lighting device (1) according to one or more of the preceding claims 2 - 11 , wherein the optical component (7) comprises an axicon (11) and/or at least one prism-shaped element (53). Holographic lighting device (1) according to one or more of the preceding claims 2 - 12 , wherein the optical component (7) comprises a combination of axicon and lens in a monolithic component (55). Holographic lighting device (1) according to one or more of the preceding claims, wherein the light coupling surface (13) is set up for beam shaping of the illumination light of the illumination arrangement (3), in particular for at least partial collimation. Holographic lighting device (1) according to one or more of the preceding claims, wherein the edge-lit hologram (15) has a light-conducting body (17) with the light-coupling surface (13) and a holographic structure (19) arranged along the transverse, two-dimensional extent, wherein the Edge-Lit hologram (15) is set up for an essentially full-surface hologram illumination of the holographic structure (19) at an angle greater than the angle of total reflection in the light guide body (17) by illumination light radiated into the light coupling surface (13). Holographic lighting device (1) according to the preceding claim, wherein the full-area hologram illumination of the holographic structure (19) is realized by direct edge illumination without multiple reflections in the light guide body (17). Holographic lighting device (1) according to the previous one claim 15 , wherein the full-area hologram illumination of the holographic structure (19) is realized by waveguide illumination with multiple reflections in the light guide body (17). Holographic lighting device (1) according to one or more of the preceding Claims 15 - 17 , wherein the light guide body (17) on the side (23) close to the lighting arrangement has a central depression (25) along which the holographic structure (19) is arranged, with a connecting surface (12) from a transverse edge (27) to the depression (25) at least partially encloses the light coupling surface (13). Holographic lighting device (1) according to one or more of the preceding Claims 15 - 18 , wherein a side surface (35) of the light-guiding body, which connects the side (23) of the light-guiding body (17) close to the lighting arrangement and the side (33) of the light-guiding body (17) remote from the lighting arrangement, has a deflection surface (37) for deflecting the incident illumination light which is set up, together with the light coupling surface (13), to generate the hologram illumination by illuminating light radiated into the light coupling surface (13). Holographic lighting device (1) according to one or more of the preceding claims, wherein on the central axis (21) between the lighting arrangement (3) and edge-lit hologram (15) a switchable light-emitting display element (69) for a side remote from the lighting arrangement when viewed (33) of the Edge-Lit hologram (15) is arranged visible light display. Holographic lighting device (1) according to one or more of the preceding claims, wherein the lighting arrangement (3) and the edge-lit hologram (15) comprise separate elements which are set up for a positive arrangement along the central axis (21), and / or for an arrangement with a flush transverse outer surface (63). Holographic lighting device (1) according to the preceding claim, wherein in the transversal edge region (49, 65, 67) between elements of the lighting arrangement (3) and/or between the lighting arrangement (3) and edge-lit hologram (15) spacers (57, 59, 61) for a distance-defined arrangement of the elements to one another which are set up for a form-fitting arrangement along the central axis (21) together with the elements. Lighting arrangement (3) for a holographic lighting device (1) according to one of the preceding Claims 21 or 22 . Edge-lit hologram (15) for a holographic lighting device (1) according to any one of the preceding Claims 21 or 22 . Spacers (49, 65, 67) for a holographic lighting device (1) according to any one of the preceding Claims 21 or 22 .

Images