DE102022115250A1 - LENS OPTICS FOR FLEXIBLE POSITIONING OF LIGHT SOURCES - Google Patents

Abstract

Lighting device (100) for a motor vehicle, comprising a light source (2) mounted on a light source carrier (1), a projection optical device (3) assigned to the light source (2), which is designed to convert light emitted by the light source (2) into a predetermined To steer an area or predetermined areas, the projection optical device (3) having a first focal point (PF1), the so-called inner focal point (PF1), which lies on a side facing the light source (2), and a second focal point (PF2), the so-called external focal point (PF2), which lies on a side of the projection device (3) facing away from the light source (2), the light source (2) being on the side of the internal focal point (PF1) of the projection optical device (3), at a distance D1 to the inner focal point (PF1) and at a distance D2 from the projection optics device (3), the light source (2) being at a greater distance from the projection optics device (3) than the inner focal point (PF1), and wherein a Transfer optics device (4) is arranged between the light source (2) and the inner focal point (PF1) of the projection device (3), the transfer optics device (4) imaging the light source (2) as a transfer image (2a), that the internal focal point (PF1) of the projection optical device (3) lies in the transfer image (2a) of the light source (2).

Description

The invention relates to a lighting device for a motor vehicle, comprising a light source mounted on a light source carrier, a projection optics device assigned to the light source, which is set up to direct light emitted by the light source into a predetermined area or predetermined areas, the projection optics device having a first focal point, the so-called inner focal point, which lies on a side facing the light source, and a second focal point, the so-called outer focal point, which lies on a side of the projection device facing away from the light source.

The invention further relates to a lighting system for a motor vehicle, comprising at least one such lighting device.

The invention also relates to a license plate device for a motor vehicle, comprising a vehicle license plate and an above-mentioned lighting device.

Finally, the invention also relates to a motor vehicle with at least one such license plate device.

Typically, in a projection system of a lighting device for a motor vehicle, the light source is arranged in a first focal point of a projection optical device, and the light rays emanating from the light source are bundled in or in an area around a further second focal point located on another side of the projection device and it In this way, a light distribution is projected in an area in front of or behind a motor vehicle or to the side of the vehicle in which the lighting device is installed.

However, it is often desirable not to be subject to such restrictions when developing lighting devices for motor vehicles.

It is an object of the invention to provide a solution to this problem.

This object is achieved with a lighting device mentioned at the outset in that, according to the invention, the light source is arranged on the side of the internal focal point of the projection optical device, at a distance D1 from the internal focal point and at a distance D2 from the projection optical device, the light source being located away from the projection optical device is located at a greater distance than the internal focal point, and wherein a transfer optical device is arranged between the light source and the internal focal point of the projection device, the transfer optical device imaging the light source as a transfer image such that the internal focal point of the projection optical device is in the Transfer image of the light source lies.

With the invention it becomes possible to position the light source outside the inner focal point of the projection optics device, in particular at a greater distance than that of the inner focal point to the projection optics device, and still image the light source sharply or as sharply as desired via the projection optics device, as if it would be in the inner focal point of the projection optics device.

The light source is positioned in a focal point of the transfer optics device and an image of the light source is imaged in the second focal point of the transfer optics device. An image of the light source in the inner focal point of the projection optical device can thus be generated, which image is then imaged by the projection optical device - as if the light source were located in the inner focal point.

For example, the light source and thus the location of the light source is defined by the center of light emission of the light source, so the formulation that “the light source is (essentially) at a focal point” can be equivalent to “that the center of light emission of the light source is in a focal point”.

The distances mentioned are measured along an optical axis or a main emission axis of the light source, on which axis the internal focal point also lies, to the point of penetration of this axis with the projection optical device.

For example, it is provided that the transfer optics device has two collimator optics and a cylinder body arranged between the two collimator optics, which comprises at least one cylindrical body, the cylinder body having two base surfaces, a first and a second base surface and at least one connecting the two base surfaces Comprises lateral surface, wherein a collimator optics each comprises a transparent collimator body which has a first end section, a so-called light collecting section, and a second end section, the light collecting section having a collimator focal point lying outside the collimator body, and where the collima gate body is designed in such a way that when light rays emanating from a light source arranged in the collimator focal point impinge on the light collecting section, these light rays enter the collimator body, are directed parallel in the collimator body and become the second End section propagate, wherein the second end section comprises a flat surface, the end section surface, which is oriented such that the parallel light rays impinge perpendicularly on the end section surface, one of the two collimator optics, the first collimator optics, being arranged such that the Light source lies essentially in the collimator focal point of the light collecting section of the first collimator body, and wherein the cylinder body is arranged next to the second end section surface of the first collimator optics, the first base surface of the cylinder body being opposite the end section surface of the first collimator body and runs parallel to this, and wherein the second collimator optics are arranged next to the at least one cylinder body in such a way that the second base surface of the cylinder body is opposite the end section surface of the second collimator body and runs parallel to it and the inner focal point of the projection optics device and the collimator -Focal point of the light collecting section of the second collimator body essentially coincide.

Light rays emitted by the light source, which are located in a first collimator focal point of the transfer optics device, are focused into the second collimator focal point or around the second collimator focal point, such that an image of the light source is created, the second collimator The focal point in this image is the light source. After the second collimator focal point and the internal focal point of the projection device coincide, the projection device can image the image of the light source as if the light source were actually at the focal point of the projection device.

It is provided, for example, that the cylinder body comprises exactly one cylindrical body, the cylindrical body being designed in the form of a straight cylinder and the two base surfaces running parallel to one another.

This is a technical solution that is structurally simple and easy to calculate.

In another embodiment it is provided that the cylinder body comprises two cylindrical bodies, the cylindrical bodies, i.e. the cylinder axes of the two cylindrical bodies, being inclined to one another at an angle β unequal to 0°, in particular greater than 90°.

This more complex solution allows a more flexible positioning of the light source; in particular, it does not have to lie in a straight line opposite its projection optical device.

In this embodiment it is preferably provided that the angle β between the cylinder axes is greater than twice the critical angle for total reflection.

The critical angle for total reflection is determined by the refractive index of the transparent material.

This makes it possible to ensure that the conditions for total reflection are met in the transition area between the two cylindrical bodies, so that as little to no light loss as possible occurs due to light rays emerging from the cylindrical body.

For example, β > 2 arcsin(1/n), where n is the refractive index of the material of the cylinder body. For PMMA, n = 1.49, β ≥ 85°, for PC n = 1.585, β ≥ 80°.

For example, the two cylindrical bodies 40a, 40b form a flat total reflection surface in their transition area, which has the shape of an ellipse, the center of which lies at the intersection of the two mutually inclined cylinder axes.

The minor axis length b of this ellipse corresponds to a cylinder radius r, while the length of the major axis a results in a = r /(cos(β/2)). The cylinder radii r of the two cylindrical bodies 40a, 40b (i.e. in the supply area and in the image area) are identical.

It is advantageous if the end section surface of the first collimator optics and the first base surface of the cylinder body adjoin one another, in particular rest against one another over the entire surface, and preferably the first collimator body and the cylinder body are formed in one piece.

In principle, the distance between the delimiting collimator optics and cylinder body surfaces can be > 0, but preferably the first collimator optics and the cylinder body lie against each other and are particularly preferably formed in one piece from the same material (or material with an identical refractive index), since then no undesirable deflection can occur when light rays exit and/or enter an interface.

However, it may also be possible for the first collimator optics and the cylinder body to be made from materials with different refractive indexes. In this exemplary embodiment, for example, the parallelism tolerance of the planes of the end section surface of the first collimator optics and the base surface of the cylinder body is better than 0.0125mm. The second collimator optics is made of the same material as the first collimator optics; the associated levels preferably meet the same tolerances

Analogously, it is advantageous if the end section surface of the second collimator optics and the second base surface of the cylinder body adjoin one another, in particular rest against one another over the entire surface, and preferably the second collimator body and the cylinder body are formed in one piece.

As already mentioned, it can in principle be useful if the transparent collimator body and the cylinder body are made of the same material.

In a one-piece design of the transfer optics made of one material, which has already been described above, the base surfaces of the cylinder body or the end section surfaces of the collimator body are only virtual, i.e. purely mental surfaces, and not actual, materially formed surfaces.

It can be provided that each collimator body has an optical axis, the optical axis of the collimator body being perpendicular to its end section surface, and preferably running through the collimator focal point of the collimator body.

An optical axis coincides with the central main radiation direction of the light sources, such as the LED light source. For example, in the case of a flat light source carrier, this is achieved in that a surface normal to the light source carrier runs parallel to the axis. The optical axis then preferably coincides with the optical axis of the projection optics when the cylinder body comprises exactly one cylindrical, in particular straight, body. In this case, the optical axis of the second collimator body also preferably coincides with that of the first collimator body.

However, it can also be provided that the main emission direction of the light source is tilted with respect to the optical axis, so that the main emission direction runs at an angle not equal to 0° to the optical axis. In this case, the image of the light source is also tilted. This embodiment is particularly useful for small (e.g. <10°) tilt angles.

It is advantageously provided that at least one, preferably each collimator body is designed to be rotationally symmetrical about its optical axis.

The cylinder body has an “optical” axis or height if the cylinder body comprises exactly one cylindrical body, and preferably the axes of the collimator bodies coincide with this axis.

It is preferably provided that the end section surface of at least one, preferably each, collimator body is congruent with the base surface of the cylinder body facing it.

It is particularly preferred if the two collimator bodies are designed identically.

In this context, it is further preferably provided that the two collimator bodies are arranged in such a way that they are or would be arranged in mirror images of one another with respect to a mirror plane if the mirror plane is an orthogonal plane to the optical axis of one of the two collimator bodies, and the optical axis of the other collimator body coincides with the optical axis of the other collimator body or if they would coincide.

In this way, the image of the light source corresponds 1:1 to the light source.

As mentioned at the beginning, the invention further relates to a lighting system for a motor vehicle, comprising at least one lighting device, the lighting system further comprising a lighting unit which is set up to generate one or more light distributions, the lighting unit comprising at least one lighting unit light source and a lighting unit optics , wherein the lighting unit is arranged essentially between the light source carrier and a cover disk of the lighting system, wherein the at least lighting unit light source is arranged on the light source carrier, and wherein the lighting unit, starting from the light source carrier in the direction of the cover disk, has an extension which is so large, that the at least one light source is not arranged in the focal point of its projection device, but at a greater distance than the distance of the inner focal point of the projection device to the projection device.

The flat light source carrier, for example, preferably carries both the at least one lighting unit light source and the light source(s) of the lighting device; in particular, all light sources are arranged on one side of the light source carrier.

For example, the use of such a lighting device is intended in a rear light.

It can be provided that the at least one projection optical device is arranged in a cover plate of the lighting system, for example made in one piece with the cover plate.

In general, a projection optics device can be a projection lens. For example, the lens effect of the projection optics device is achieved by the design of the cover disk, for example through a corresponding, regional curvature(s), for example the inside and/or the outside of the cover disk.

For example, it can be provided that the lighting unit is a floor projection device and the one or more light distributions include one or more floor projections.

The invention further relates to a license plate lighting device for a motor vehicle, comprising a vehicle license plate and a lighting device described above, wherein the lighting device is arranged in relation to the license plate in such a way that one or more areas into which light emitted by the projection device of the at least one light source are emitted, lie on the license plate, so that the license plate is at least partially, preferably completely illuminated by light from the at least one light source when the at least one light source is switched on.

• 1 eine Kennzeichenvorrichtung in einer Ansicht von Oben,
• 2 die Kennzeichenvorrichtung aus 1 in einer perspektivischen Schnittansicht,
• 3 eine Ausführungsform einer erfindungsgemäßen Beleuchtungsvorrichtung mit einer Transfer-Optikvorrichtung,
• 4 eine weitere Ausführungsform einer Transfer-Optikvorrichtung,
• 5 eine weitere Ausführungsform einer Transfer-Optikvorrichtung für kleine Verkippungswinkel,
• 6 schematische Bodenprojektionen erzeugt mit einer Kennzeichenvorrichtung aus 1 bzw. 2.

The invention is explained in more detail below using the figures. It shows

• 1 a license plate device in a view from above,
• 2 the license plate device 1 in a perspective sectional view,
• 3 an embodiment of a lighting device according to the invention with a transfer optics device,
• 4 another embodiment of a transfer optics device,
• 5 a further embodiment of a transfer optics device for small tilt angles,
• 6 schematic floor projections generated with a license plate device 1 or. 2 .

Below, an example of a lighting device according to the invention will be discussed in more detail using a license plate device 200. However, this is only a particularly preferred application; in principle, a lighting device according to the invention can also be used in other vehicle lights, for example in taillights or in vehicle headlights.

1 and 2 show a license plate device 200 for a motor vehicle, comprising a vehicle license plate 300 and two lighting devices 100. The lighting devices 100 are arranged in relation to the license plate 300 in such a way that light is emitted into one or more areas that lie on the license plate 300, so that the license plate 300 is at least partially, preferably completely, illuminated by light when the lighting devices 100 (or at least one of them) are switched on.

Specifically, the license plate device 200 includes a lighting system 400, which in the present example has the two lighting devices 100. Furthermore, the lighting system 400 includes a lighting unit 10, which is set up to generate one or more light distributions LV, the lighting unit 10 comprising at least one lighting unit light source 11 and a lighting unit optics 12a, 12b, 12c, the lighting unit 10 essentially between the light source carrier 2 and a cover plate 5 of the lighting system 400 is arranged.

In the specific example, three lighting units 10 are provided, each with a light source 11 (for example an LED or comprising one or more LEDs) and a lighting unit optics 12, which in turn each have a lighting unit collimator 12a, an MLA 12b (“Micro Lens Array “) and a deflection mirror 12c.

The deflecting mirrors 12c interact with their MLA 12b in such a way that, for example, the generated light distribution or the generated light distributions LV are floor projections BP, i.e. light distributions or light patterns imaged onto a floor, in particular a roadway, as shown in 6 , which shows a motor vehicle 500 with a license plate device 200, is shown schematically.

The lighting unit light sources 11 are arranged on a, preferably flat, light source support 1.

As already mentioned above, the lighting system 400 or the license plate device 200 includes two lighting devices 100 with which the license plate 300 is illuminated. The preferably flat light source carrier 1 carries both the light sources 11 and the light sources 1.

Such a lighting device 100 for a motor vehicle, which is described in detail in 3 is shown, comprises a light source 2 (for example an LED or one or more LEDs), which is mounted on a light source carrier 1, specifically on the light source carrier 1 for the lighting unit light sources 11, in particular on the same side. The light source 2 is assigned a projection optical device 3, which is set up to direct the light emitted by the light source 2 into a predetermined area or predetermined areas.

In the example shown, the projection optical devices 3 of the lighting devices 100 are arranged in a cover plate 5 of the lighting system 400, for example made in one piece with the cover plate 5 or formed in the cover plate 5.

In general, a projection optics device can be a projection lens. For example, the lens effect of the projection optics device is achieved by the design of the cover plate, for example through a corresponding, regional curvature (s), e.g. the inside and / or the outside of the cover plate, in order to preferably achieve the most homogeneous possible surface illumination of the license plate 300.

The projection optical device 3 has a first focal point PF1, the so-called inner focal point, which lies on a side facing the at least one light source 2, and a second focal point PF2, the so-called external focal point, which lies on a side of the projection device 3 facing away from the at least one light source 2 lies on.

Typically, the light source 2 would be arranged in the inner focal point PF1 of the projection device 3. It is now desirable to arrange all light sources 11, 2 on a common support 1, but this creates the problem that due to the expansion of the individual lighting units 10, the light sources 2 of the lighting device 100 can no longer be arranged in the inner focal point PF1, but instead are located at a greater distance from the projection device 3.

After the light source 2 is arranged on the side of the internal focal point PF1 of the projection optical device 3, at a distance D1 from the internal focal point PF1 and at a distance D2 from the projection optical device 3, the light source 2 being at a greater distance from the projection optical device 3 as the internal focal point PF1 is located (D2 > (D2 - D1)), a transfer optical device 4 is arranged between the light source 2 and the internal focal point PF1 of the projection device 3, the transfer optical device 4 using the light source 2 as a transfer image 2a shows that the internal focal point PF1 of the projection optical device 3 lies in the transfer image 2a of the light source 2.

The distances mentioned are measured along an optical axis or a main emission axis of the light source, on which axis the internal focal point also lies, to the point of penetration of this axis with the projection optical device.

In the specific embodiment according to 3 It is provided that the transfer optics device 4 comprises two collimator optics 50, 60 and a cylinder body 40 arranged between the two collimator optics 50, 60, which consists of a cylindrical body 40a, the cylinder body 40 or the cylindrical body 40a being two Base surfaces, a first and a second base surface 41, 42 and at least one lateral surface 43a connecting the two base surfaces 41, 42.

The cylindrical body 40a is thus designed in the form of a straight cylinder, the two base surfaces 41, 42 run parallel to one another.

A collimator optics 50, 60 each comprises a transparent collimator body 510, 610, which has a first end section, a so-called light collecting section 511, 611, and a second end section 512, 612, the light collecting section 511, 611 being a has a collimator focal point F1, F2 located outside the collimator body 510, 610, and wherein the collimator body 510, 610 is designed such that when light rays emanating from a light source arranged in the collimator focal point F1, F2 are directed onto the light -Collecting section 511, 611, these light rays enter the collimator body 510, 610, in which collimator body 510, 610 are directed parallel and to the second end section 512, 612 as a parallel beam PS propagate, wherein the second end portion 512, 612 comprises a flat surface, the end portion surface 512a, 612a, which is oriented such that the parallel light rays perpendicularly impinge on the end portion surface 512a, 612a.

One of the two collimator optics, the first collimator optics 50, is arranged such that the collimator focal point F1 of its collimator body 510 lies in the light source 2.

The cylinder body 40 is arranged next to the end section surface 512a of the first collimator optics 50, with the first base surface 41 of the cylinder body 40 being opposite the end section surface 512a of the first collimator body 51 and running parallel to it, and being adjacent to the cylinder body 40 second collimator optics 60 is arranged such that the second base surface 42 of the cylinder body 40 is opposite the end section surface 612a of the second collimator body 61 and runs parallel to it and the inner focal point PF1 of the projection optical device 3 and the collimator focal point F2 of the light collecting section 611 of the second collimator body 610 essentially coincide.

“Essentially coincide” generally means, not limited to the present example, that the two focal points either actually coincide or are at most so far apart from each other that both lie in the image 2a generated by the light source 2.

Light rays emitted by the light source 2, which are located in a first collimator focal point F1 of the transfer optics device 4, are bundled into the second collimator focal point F2 or around the second collimator focal point, such that an image 2a of the light source 2 is created , whereby the second collimator focal point F2 lies within this image 2a of the light source 2. After the second collimator focal point F2 and the internal focal point PF1 of the projection device 3 essentially coincide, the projection device 3 can image the image 2a of the light source 2 as if the light source 2 were actually located in the internal focal point PF1 of the projection device 3.

As in the example 3 shown, end section surface 512a of the first collimator optics 50 and the first base surface 41 of the cylinder body 40 lie against one another over the entire surface and are preferably the first collimator body 510 and the cylinder body 40 formed in one piece from the same material.

Analogously, it is advantageous that the end section surface 612a of the second collimator optics 60 and the second base surface 42 of the cylinder body 40 adjoin one another, in particular rest against one another over the entire surface, and preferably the second collimator body 610 and the cylinder body 40 are formed in one piece and made of the same material consist.

The end section surfaces 512a, 612a of the collimator bodies 510, 610 are congruent with the base surface 41, 42 of the cylinder body 40 facing them.

The two collimators 50, 60 and the cylindrical body 40a are therefore a component made of a material, in particular a transparent material. In the described and shown one-piece design of the transfer optics made of one material, the base surfaces of the cylinder body or the end section surfaces of the collimator body are only virtual, i.e. purely mental surfaces, and not actual, materially formed surfaces

Each collimator body 510, 610 has an optical axis O1, O2, the optical axis O1, O2 of the collimator body 510, 610 being perpendicular to its end portion surface 512a, 612a and preferably through the collimator focal point F1, F2 of the collimator -Body 510, 610 runs.

Typically, the optical axis O1 coincides with the central main radiation direction of the light source 2. The optical axis O2 preferably coincides with the optical axis OP of the projection optical device 3.

The cylinder body 40a has an “optical” axis O3 or height; the direction of propagation of the parallel beam PS corresponds to the direction of the axis O3. In the present case, the axes O1, O2 of the collimator body preferably coincide with this axis O3.

It is advantageously provided that the collimator bodies 510, 610 are designed to be rotationally symmetrical about their respective optical axes O1, O2, and it is particularly advantageous if the two collimator bodies 510, 610 are designed identically.

In general, it is preferably provided that the two collimator bodies 510, 610 are arranged in such a way that they are or would be arranged in mirror images of one another with respect to a mirror plane if the mirror plane is an orthogonal plane to the optical axis O1 of one of the two collimator bodies 510 , and the optical axis O2 of the other collimator body 610 with the optical axis O1 of the other collimator body 510 coincides or if they would coincide.

In this way, the image 2a of the light source corresponds 1:1 to the light source 2 or the shape of the light source.

4 shows an alternative embodiment of a transfer optics device 4, which is as in 3 shown includes two collimators 50, 60 and a cylinder body 40. The above related 3 The statements made also apply in full to the in 4 embodiment shown, with the difference that the cylinder body 40 comprises two cylindrical bodies 40a, 40b, the cylindrical bodies 40a, 40b (outer surfaces 43a, 43b), ie the cylinder axes or heights O3a, O3b of the two cylindrical bodies 40a, 40b, are inclined to one another at an angle β not equal to 0°, in particular greater than 90°.

The axes O1, O3a preferably coincide, as do the axes O2, O3b and OP (optical axis of the projection optical device).

This more complex solution allows a more flexible positioning of the light source; in particular, it does not have to be arranged in a straight line opposite its projection optical device.

It is preferably provided that the angle β between the cylinder axes O3a, O3b is greater than twice the critical angle for total reflection. This makes it possible to ensure that the conditions for total reflection are met in the transition area between the two cylindrical bodies, so that as little to no light loss as possible occurs due to light rays emerging from the cylindrical body.

For example, β>2 arcsin(1/n), where n is the refractive index of the material of the cylinder body 40. For PMMA, n = 1.49, therefore β ≥ 85°, for PC n = 1.585, therefore β ≥ 80°.

bestimmt, die mit einer Winkelsymmetrale der Zylinderachsen O3a und O3b ident ist. Die Nebenachsenlänge b dieser Ellipse entspricht dabei einem Zylinderradius r, während die Länge der Hauptachse a sich ergibt zu a = r / (cos(β/2). Die Zylinderradien r der beiden zylinderförmigen Körper 40a, 40b (d.h. im Zuleitungsbereich und im Bildbereich) sind ident.For example, the two cylindrical bodies 40a, 40b form a flat total reflection surface E in their transition area, which has the shape of an ellipse, the center of which lies at the intersection of the two mutually inclined cylinder axes. The total reflection surface E is through a surface normal $\overrightarrow{n}$

determined, which is identical to an angular symmetry of the cylinder axes O3a and O3b. The minor axis length b of this ellipse corresponds to a cylinder radius r, while the length of the major axis a results in a = r / (cos(β/2). The cylinder radii r of the two cylindrical bodies 40a, 40b (ie in the supply area and in the image area) are identical.

Analogous to 3 In this embodiment, the main radiation direction of the light source can also coincide with the optical axis O1 of the collimator 50, or can be inclined to one another at an angle greater than 0°.

5 shows in this context an embodiment in which the main radiation direction HR of the light source is tilted with respect to the optical axis O1 of the collimator 50, so that the main radiation direction runs at an angle not equal to 0° to the optical axis O1. In this case, the image of the light source is also tilted. In addition, the optical axis O2 of the second collimator 60 is tilted to the optical axis OP of the projection device 3 (typically at the same angle as that between the axis O1 and the main radiation direction HR of the light source).

Preferred (tilt) angles γ between the main radiation direction HR and the optical axis O1 are greater than 165°. This tilting allows the position and position of the light source circuit board to be chosen more freely; This subsequently leads to a shortening of the (axial) installation depth/length, but an increase in the lateral installation width.

Claims (18)

Lighting device (100) for a motor vehicle, comprising a light source (2) mounted on a light source carrier (1), a projection optical device (3) assigned to the light source (2), which is designed to convert light emitted by the light source (2) into a predetermined To steer an area or predetermined areas, the projection optical device (3) having a first focal point (PF1), the so-called inner focal point (PF1), which lies on a side facing the light source (2), and a second focal point (PF2), the so-called external focal point (PF2), which lies on a side of the projection device (3) facing away from the light source (2), characterized in that the light source (2) is on the side of the internal focal point (PF1) of the projection optical device (3), in is arranged at a distance D1 from the internal focal point (PF1) and at a distance D2 from the projection optical device (3), the light source (2) being at a greater distance from the projection optical device (3) than the internal focal point (PF1), and wherein a transfer optical device (4) is arranged between the light source (2) and the internal focal point (PF1) of the projection device (3), the transfer optical device (4) using the light source (2) as a transfer image (2a ) depicts, that the internal focal point (PF1) of the projection optical device (3) lies in the transfer image (2a) of the light source (2). lighting device Claim 1 , wherein the transfer optics device (4) has two collimator optics (50, 60) and a cylinder body (40) arranged between the two collimator optics (50, 60), which comprises at least one cylindrical body (40a, 40b), wherein the cylinder body (40) comprises two base surfaces, a first and a second base surface (41, 42) and at least one lateral surface (43a, 43b) connecting the two base surfaces (41, 42), with a collimator optics (50, 60) in each case a transparent collimator body (510, 610) having a first end portion, a so-called light collecting portion (511, 611), and a second end portion (512, 612), the light collecting portion (511, 611). has a collimator focal point (F1, F2) located outside the collimator body (510, 610), and wherein the collimator body (510, 610) is designed such that when from one in the collimator focal point (F1, F2 ) arranged light source, outgoing light rays impinge on the light collecting section (511, 611), these light rays enter the collimator body (510, 610), in the collimator body (510, 610) are directed parallel and towards the second end section (512, 612), wherein the second end portion (512, 612) comprises a flat surface, the end portion surface (512a, 612a), which is oriented such that the parallel light rays perpendicularly impinge on the end portion surface (512a, 612a), wherein one of the two collimator optics, the first collimator optics (50), is arranged such that the light source (2) is essentially in the collimator focal point (F1) of the light collecting section (511) of the first collimator body (510) lies, and wherein the cylinder body (40) is arranged next to the second end section surface (512a) of the first collimator optics (50), the first base surface (41) of the cylinder body (40) being the end section surface (512a) of the first collimator body (51) lies opposite and runs parallel to it, and wherein the second collimator optics (60) is arranged next to the at least one cylinder body (40) in such a way that the second base surface (42) of the cylinder body (40) of the end section surface (612a) of the second collimator body (61) is opposite and runs parallel to it and the inner focal point (PF1) of the projection optical device (3) and the collimator focal point (F2) of the light collecting section (611) of the second collimator body (610) in Essentially coincide. lighting device Claim 2 , wherein the cylinder body (40) comprises exactly one cylindrical body (40a), the cylindrical body (40a) being designed in the form of a straight cylinder and the two base surfaces (41, 42) running parallel to one another. lighting device Claim 2 , wherein the cylinder body (40) comprises two cylindrical bodies (40a, 40b), wherein the cylindrical bodies (40a, 40b), ie the cylinder axes (O3a, O3b) of the two cylindrical bodies (40a, 40b) are at an angle β not equal to 0 °, in particular greater than 90°, are inclined to one another. lighting device Claim 4 , where the angle β between the cylinder axes (O3a, O3b) is greater than twice the critical angle for total reflection. Lighting device according to one of the Claims 2 until 5 , wherein the end section surface (512a) of the first collimator optics (50) and the first base surface (41) of the cylinder body (40) adjoin one another, in particular rest against one another over the entire surface, and preferably the first collimator body (510) and the cylinder body (40 ) are formed in one piece. Lighting device according to one of the Claims 2 until 6 , wherein the end section surface (612a) of the second collimator optics (60) and the second base surface (42) of the cylinder body (40) adjoin one another, in particular rest against one another over the entire surface, and preferably the second collimator body (610) and the cylinder body (40 ) are formed in one piece. Lighting device according to one of the Claims 2 until 7 , wherein the transparent collimator bodies (510, 610) and the cylinder body are formed from the same material. Lighting device according to one of the Claims 2 until 8th , wherein each collimator body (510, 610) has an optical axis (O1, O2), the optical axis (O1, O2) of the collimator body (510, 610) being perpendicular to its end section surface (512a, 612a), and preferably runs through the collimator focal point (F1, F2) of the collimator body (510, 610). lighting device Claim 9 , wherein at least one, preferably each collimator body (510, 610) is rotationally symmetrical about its optical axis (O1, O2). Lighting device according to one of the Claims 2 until 10 , wherein the end section surface (512a, 612a) is at least one, preferably each Collimator body (510, 610), is congruent with the base surface (41, 42) of the cylinder body (40) facing it. Lighting device according to one of the Claims 2 until 11 , whereby the two collimator bodies (510, 610) are designed identically. lighting device Claim 12 , wherein the two collimator bodies (510, 610) are arranged such that they are or would be arranged in mirror images of one another with respect to a mirror plane if the mirror plane is an orthogonal plane to the optical axis (O1) of one of the two collimator bodies (510 ), and the optical axis (O2) of the other collimator body (610) coincides with the optical axis (O1) of the other collimator body (510) or if they would coincide. Lighting system (400) for a motor vehicle, comprising at least one lighting device (100) according to one of Claims 1 until 13 , wherein the lighting system (400) further comprises a lighting unit (10) which is set up to generate one or more light distributions (LV), the lighting unit (10) having at least one lighting unit light source (11) and a lighting unit optics (12a, 12b, 12c), wherein the lighting unit (10) is arranged essentially between the light source carrier (1) and a cover plate (5) of the lighting system (400), wherein the at least lighting unit light source (11) on the light source carrier (1) is arranged, and wherein the lighting unit (10), starting from the light source carrier (2) in the direction of the cover plate (5), has an extension which is so large that the at least one light source (2) is not in the focal point of its projection device (3), but is arranged at a greater distance than the distance between the inner focal point (PF1) of the projection device (3) and the projection device (3). lighting system Claim 14 , wherein the at least one projection optical device (3) is arranged in the cover plate (5) of the lighting system (400), for example made in one piece with the cover plate (5). lighting system Claim 14 or 15 , wherein the lighting unit (10) is a floor projection device and the one or more light distribution patterns (LV) comprises one or more floor projections (BP). License plate device for a motor vehicle, comprising a vehicle license plate (300) and a lighting system (400) according to one of Claims 14 until 16 , wherein the lighting device (100) is arranged in relation to the license plate (300) in such a way that one or more areas into which light emitted by the projection device (3) of the at least one light source (2) is/are emitted, on the license plate (300), so that the license plate (300) is at least partially, preferably completely illuminated by light from the at least one light source (2) when the at least one light source (2) is switched on. Motor vehicle with at least one lighting device according to one of Claims 1 until 13 , or with at least a lighting system according to one of the Claims 14 until 16 , or with at least one license plate device Claim 17 .

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