VEHICLE INTERIOR LIGHTING DEVICE

Description

Technical field

[0001] The present invention relates to a vehicle interior lighting device comprising an elongated light guide with at least one end-face light coupling surface, a longitudinal light deflection surface, and a longitudinal light extraction surface opposite the light deflection surface, as well as at least one light source whose light can be coupled into the light guide at the at least one light coupling surface and can be coupled out of the light guide at the light extraction surface by means of light deflection at the light deflection surface. The invention also relates to a vehicle with at least one such vehicle interior lighting device. The vehicle interior lighting device is particularly advantageous for use in door lighting. State of the art

[0002] EP 2 500 753 A1 discloses a light guide which has a volume that conducts light along a main propagation direction and which has at least a has an output coupling element with an interface that directs light through total internal reflection at its interface The light is deflected at an angle onto a light-emitting surface, at which point it exits the optical fiber. The optical fiber is characterized by the fact that the output coupling element protrudes from one side of the light-conducting volume perpendicular to the main propagation direction, and that the light-emitting surface forms part of the interface of the output coupling element.

[0003] DE 10 2009 012 224 A1 discloses a light guide device suitable for use in automotive lighting applications. It comprises a main light guide suitable for guiding light within the light guide under total internal reflection and a plurality of light-conducting, light-extracting elements arranged within the light guide. The light-extracting elements consist of a solid body with a light-exiting surface. A light-transmitting surface is provided at the point where the light-extracting element is coupled to the main light guide, providing a path for light rays that, due to total internal reflection, directly impinge upon the light-transmitting surface. This path leads from within the light guide, across the light-transmitting surface, through the light-exiting surface, and to an outside of the light guide device.Furthermore, a motor vehicle lighting device is disclosed which includes a light source connected to a light guide device to couple light into the main light guide.

[0004] EP 3 210 827 A1 discloses a lamp for a motor vehicle with at least one lamp and a planar light guide with at least one light coupling surface and at least one light coupling surface spaced apart from it, provided on a first flat side of the light guide, wherein coupling elements are arranged on a second flat side of the light guide, which is opposite the light coupling surface, at which light rays guided in the planar light guide are deflected to the light coupling surface, so that they exit the planar light guide, wherein the lamp interacts with a rod-shaped light guide and the light of the lamp enters the rod-shaped light guide at a light entry surface of the rod-shaped light guide and exits it again via a light exit surface provided on the circumferential surface in order to be coupled into the light coupling surface of the planar light guide.

[0005] US 2018 / 0118104 A1 discloses a light guide for a lighting module, particularly for a motor vehicle. The light guide serves to direct light emanating from a light source located within it. The light guide comprises a curved inlet section that is optically coupled to the light source to introduce light into the light guide. An outlet section is optically coupled to the inlet section and is designed to emit all or part of the light coupled into the light guide. The inlet section includes an optical element configured to emit a portion of the light entering the inlet section.

[0006] EP 0 191 264 A2 discloses a device for glare control of large-area light sources for indoor and outdoor lighting. Using prisms, triangular prisms are arranged with one of their side faces perpendicular and the other side face horizontal, the side faces forming an angle of 90° and the horizontal side face forming a wedge angle of 35° to 45°, preferably 40°, with the base.

[0007] EP 2 980 469 A1 and US 2014 / 0140091 A1 disclose vehicle interior lighting devices. Description of the invention

[0008] One object of the invention is therefore to provide an improved possibility for the targeted illumination of certain sub-areas of a vehicle interior using means that are as simple as possible in terms of construction.

[0009] The problem is solved by the subject matter of the independent claims. Advantageous embodiments of the invention are specified in the dependent claims, the description, and the accompanying figures.

[0010] The use of at least one light-deflectoring prism offers the advantage of redirecting light incident on the optical output surface, which would otherwise fall outside the desired target area of ​​a vehicle interior (e.g., the inside of a vehicle door), onto the target area. This improves the light output in the target area. It also largely prevents disruptive stray light from being emitted from otherwise undesirably illuminated areas of the vehicle interior (e.g., pillars). The jump between two refractive indices achieves a particularly effective beam deflection, especially compared to a single-component prism integrated into the light guide in one piece.Another advantage is that the lighting device can be arranged in such a way that at least one light deflection prism is visible even when switched off or not illuminated, thus creating a novel, high-quality appearance.

[0011] By means of the multiple light deflection areas, it is advantageously possible to achieve a targeted extraction of light from the optical fiber along its longitudinal direction in a fundamentally known manner.

[0012] The fact that the at least one light-deflection prism is arranged between two adjacent light-deflection areas when viewed perpendicular to the light output surface offers the advantage that the at least one light-deflection prism can deflect unwanted light exiting the light guide at a shallow angle back into the light guide by total internal reflection, or direct it into a useful light area by total internal reflection and refraction, thus increasing efficiency. Conversely, the useful light exiting the light guide at a steep angle advantageously passes by the at least one light-deflection prism and is not affected by it, e.g., not attenuated.

[0013] The fact that the at least one light-deflection prism is arranged between two adjacent light deflection areas when viewed perpendicular to the light extraction surface can include the at least one light-deflection prism or the area it occupies being arranged disjointly from the light deflection areas or the areas they occupy, or these areas not overlapping or overlapping. Alternatively, in embodiments not covered by the subject matter of the claim, the at least one light-deflection prism can partially cover or overlap one or both light deflection areas when viewed perpendicular to the light extraction surface, but not completely. A further embodiment is that the at least one light-deflection prism does not cover more than 50% of each light deflection area in terms of area and / or length, in particular not more than 25%, and in particular not more than 10%.The at least one light deflection prism, when viewed perpendicular to the light extraction surface of the light guide, therefore does not completely or only partially cover the associated adjacent light deflection areas, or in embodiments that do not fall under the scope of the claim.

[0014] A vehicle interior lighting device is a lighting device designed to illuminate at least a portion of a vehicle interior. An elongated light guide is understood to be, in particular, a light guide whose length is significantly greater than its height and / or width. Its ends, relative to its longitudinal direction or extent, are referred to as end faces or end surfaces. At least one of the end faces is designed to provide a light coupling surface such that light is coupled into the light guide through it. Light can generally be coupled in at one or both end faces.

[0015] In particular, the length of the optical fiber is at least one order of magnitude greater than its width, i.e., at least a factor of 10. However, this ratio between length and width is not limited to this and can, for example, also be in the range of at least a factor of 2, at least a factor of 5, etc.

[0016] A side of the optical fiber extending along its longitudinal direction, particularly between the two end faces, can also be referred to as the longitudinal side. The light deflection surface and the light extraction surface correspond to opposite longitudinal sides or shorter sections thereof.

[0017] The optical fiber can be a rod-shaped or beam-shaped optical fiber that is significantly shorter in its vertical and horizontal directions perpendicular to its longitudinal direction than in its longitudinal direction, in particular by at least a factor of 10. This can also be described as L >> H, B, where L is the length of the optical fiber, H is the height of the optical fiber, and B is the width of the optical fiber. Optical fibers with such a basic shape are often also referred to as rod-shaped optical fibers. The height H and the width B of the optical fiber can be the same or different in size or extent. The use of a rod-shaped optical fiber with the relationship L • 10·H,B • 5·B,H is particularly advantageous.

[0018] The optical fiber can be a plate-shaped or disc-shaped optical fiber whose height H and width B differ significantly, i.e., that L > H > B or L > B > H. Height H and width B can differ, for example, by a factor of at least 2, and in particular by a factor of at least 5.

[0019] If the height H and width B of the optical fiber differ, the longer sides are referred to as flat sides, and the shorter sides as narrow sides. The light coupling surface and the light deflection surface can be located on either the narrow or the flat sides.

[0020] It is a further development that the optical fiber has a rectangular cross-section along its longitudinal extent, which enables particularly efficient and low-loss light emission as well as effective light deflection. However, the cross-section is not limited to this and can also be defined, for example, as a two-sided flattened circle, trapezoidal, or by a free-form profile. If the cross-sectional shape corresponds to that of a two-sided flattened circle, it can also be a circular shape with two non-intersecting straight circular sections. The light deflection surface and the light extraction surface are located at the straight circular sections. It is a further development that the circular sections are arranged parallel to each other. They can have the same length or different lengths.This cross-sectional shape can also be expressed as corresponding to a rectangular or trapezoidal basic shape with convexly curved side edges, with the light deflection surface and the light extraction surface located on the straight sides.

[0021] The cross-section can be constant in size and / or shape along the longitudinal lumen of the optical fiber, but is not limited to this.

[0022] The optical fiber can extend at least partially in a straight line and / or at least partially in a curved line along its length.

[0023] A light guide is specifically a transparent light guide. It can be made of, for example, plastic or glass.

[0024] The at least one light source can, for example, comprise at least one LED. The light coupled into the optical fiber from the at least one light source is guided along the sides of the optical fiber in a generally known manner by reflection, e.g., total internal reflection.

[0025] The light deflection areas serve to direct incident light onto the light output surface at such a (typically small or steep) angle of incidence that the light is no longer reflected back into the light guide, but exits or is coupled out through the light output surface.

[0026] The fact that at least one light-deflectoring prism is optically connected downstream of the light extraction surface means, in particular, that a portion of the light emitted from the light extraction surface passes through the at least one light-deflectoring prism and is thereby deflected. The light-deflectoring prism can be a deflecting prism and / or a deflecting prism. Another portion of the light emitted from the light extraction surface passes by the at least one light-deflectoring prism and, in particular, directly—and thus undamped—onto the area to be illuminated ("illumination area") of the vehicle interior. Specifically, the area of ​​the at least one light-deflectoring prism, projected conceptually perpendicularly onto the light extraction surface of the light guide, is smaller than the size of the light extraction surface, so that a portion of the light emitted from the light extraction surface can pass by the at least one light-deflectoring prism.

[0027] The fact that at least one change in refractive indices occurs in a light path between the optical fiber and the at least one light-deflection prism results in particularly effective beam deflection. This condition can also be formulated as requiring that at least one interface between materials with different refractive indices exists between the optical fiber and the at least one light-deflection prism.

[0028] In cases where the vehicle interior lighting device has multiple light-deflecting prisms, one embodiment is to arrange the light-deflecting prisms separately from one another on the light-emitting surface, particularly when viewed perpendicularly. This has the advantage that light exiting the light guide between the light-deflecting prisms or passing by them can be emitted undamped as useful light. This embodiment specifically includes the fact that two light-deflecting prisms are not connected to each other as protruding areas of a continuous material layer, in which case the light passing between the light-deflecting prisms would still pass through the non-protruding area of ​​the material layer and thus be attenuated and / or scattered, e.g., due to Fresnel losses and / or reflection losses.

[0029] One embodiment involves the optical fiber having a different refractive index than the at least one light-deflection prism. This achieves the advantage of particularly effective beam deflection by the prism, even when it rests practically directly on the optical fiber (possibly separated by a thin, optically ineffective adhesive layer) or is even integrally bonded to it. A different refractive index can be achieved, for example, by using different materials for the optical fiber and the prism. In one embodiment, the optical fiber and the prism can be made of different plastics, and in another, different types of glass. Yet another embodiment consists of one component made of glass, the other of plastic, and so on.The material pairings of the optical fiber and prism can also be designed such that they have the same or different base materials, with at least one material containing an additive or admixture that modifies the refractive index. The plastic could be, for example, PMMA or PC.

[0030] One embodiment involves the at least one light-deflection prism being a component manufactured separately from the light guide. This enables a particularly robust, precise, and easy-to-manufacture device. It also facilitates the provision of light guides and prisms with different refractive indices. The contact surfaces of the light guide and prism can then rest directly on each other (e.g., directly or separated only by a thin, optically ineffective adhesive layer).

[0031] This embodiment involves at least one light-deflecting prism and the light guide forming a single-piece multi-component component, particularly a two-component component, and the area of ​​the component representing the at least one light-deflecting prism has a different refractive index than the area representing the light guide. This achieves the advantage of a particularly robust, precise, and easily manufactured device. Such a multi-component component can, for example, be manufactured using a multi-component injection molding process, e.g., from plastic or glass.

[0032] This design incorporates at least one light-deflecting prism separated from the light guide by a slit. This enables effective light deflection by means of a prism even when the materials of the prism and the light guide are the same. Alternatively or additionally, the light deflection effect can be enhanced if the materials are different.

[0033] One design feature is that the gap is an air gap. This is particularly inexpensive to provide. Positioning of a light-deflection prism relative to the light guide can then be achieved, for example, via lateral fastening, e.g., as a one-piece manufactured component (e.g., in the form of an injection-molded part) or by means of a separate mounting device.

[0034] One embodiment involves a gap filled with a solid material whose refractive index differs from that of at least one of the light-deflecting prisms. This provides the advantage of a particularly robust and effective light-deflecting vehicle interior lighting device. For effective beam deflection, it is especially advantageous if the refractive index of the material in the gap differs from the refractive indices of the optical fiber and the at least one light-deflecting prism. The refractive indices of the optical fiber and the at least one light-deflecting prism can be the same or different.

[0035] According to the invention, the at least one light-deflection prism is arranged completely or disjointly between the light-deflection areas when viewed perpendicular to the light extraction surface. This advantageously allows for a particularly high proportion of undamped useful light to be provided directly from the light guide.

[0036] This design features several light-deflecting prisms spaced apart along the length of the optical fiber, such that, when viewed perpendicular to the light-emitting surface, the prisms are positioned between two adjacent light-deflection regions. Therefore, when viewed perpendicular to the light-emitting surface of the optical fiber, the prisms do not completely cover the corresponding light-deflection regions. In other words, they do not completely cover the light-deflection regions, i.e., they do not cover them at all or only partially. Thus, in this design, when viewed perpendicular to the light-emitting surface, there always remains an area below each of the light-emitting surfaces that is not covered by the prisms.

[0037] One embodiment involves at least one light-deflectoring prism projecting laterally beyond the light-extraction surface of the optical fiber, at least on one side—and especially on both sides—i.e., perpendicular to the longitudinal direction of the optical fiber. The at least one light-deflectoring prism can, for example, have a greater width than the optical fiber. This achieves the advantage of deflecting a particularly large amount of stray light into the useful light range. A further embodiment involves arranging a light-entry surface of the at least one light-deflectoring prism parallel to an opposing surface area of ​​the light-extraction surface of the optical fiber.

[0038] It is a further development that at least one light deflection area is notched or triangular in profile cross-section. The light deflection area, referred to simply as a "notch" in the following, can be a recess or recess in the light deflection surface and / or a projection extending from the light deflection surface. The notch can be pointed or rounded in cross-section, symmetrical or asymmetrical. The notch can be a continuous notch across the surface. If several notches are present, adjacent notches can be equidistant or have different spacing from each other, at least two notches can have the same or different sizes, and / or at least two notches can have the same or different shapes.

[0039] The problem can also be solved by a vehicle having at least one interior lighting device as described above. The vehicle can be designed analogously to the interior lighting device and offers the same advantages.

[0040] The vehicle can be a motor vehicle (e.g. a car such as a passenger car, truck, bus, etc.), a railway, a watercraft (e.g. a boat or a ship) or an aircraft (e.g. an airplane or a helicopter).

[0041] One embodiment includes at least one vehicle interior lighting device for illuminating a door, and at least one light-deflectoring prism is arranged relative to the light guide such that it deflects light from the light output surface towards the door and onto the door. A further embodiment includes the vehicle interior lighting device specifically reducing glare from the C-pillar. Brief character description

[0042] An advantageous embodiment of the invention is explained in more detail below with reference to the accompanying figures. These show: Figure 1 shows an oblique view of a vehicle interior lighting device according to the invention; Figure 2 shows a simplified sketch of a section of the vehicle interior lighting device in a sectional side view. Figure 1; and Figure 3 shows, as a sectional view in front view, a section of a vehicle with the vehicle interior lighting device made of Figure 1 . Figure 1 Figure 1 shows an oblique view of a vehicle interior lighting device 1, which has an elongated light guide 2 made of a transparent material with a refractive index n1, e.g. made of plastic such as PC or PMMA.

[0043] The optical fiber 2 is designed as a profile body of length L extending in a straight line along its longitudinal direction x and having a rectangular, constant cross-sectional shape. In the vertical direction y, perpendicular to the longitudinal direction x, it has a height H, and in the horizontal direction z, perpendicular to both the longitudinal direction x and the vertical direction y, it has a width B, where L >> H and L >> B, in particular L • 10·H and L • 10·B. The optical fiber 2 can therefore also be described as a rod-shaped optical fiber. Furthermore, purely by way of example, H > B, in particular H • 2·B, specifically H • 5·B. The optical fiber 2 is thus significantly taller than it is wide.

[0044] The vehicle interior lighting device 1 further comprises at least one light source 3, e.g., in the form of at least one LED, the light of which can be coupled into one of the two end faces. This end face thus provides or constitutes an end-face light coupling surface 4. The mutually parallel narrow sides of the light guide 2 with the areas L·B provide or constitute a longitudinal light deflection surface 5 and a longitudinal light extraction surface 6, respectively, and are thus opposite each other. Light emitted from the light source 3 through the light coupling surface 4 into the light guide 2 is guided therein in a generally known manner, e.g., by total internal reflection.

[0045] Several light deflection zones in the form of notches 7 are arranged in a series along the longitudinal direction x and spaced apart from one another on the light deflection surface 5. The notches 7, shown here as an example, have different sizes and shapes depending on the light coupling surface 4 in order to achieve a uniform coupling of useful light along the longitudinal direction x. The shape of the notches can also vary. All notches 7 are shown here as being continuous in the width direction z.

[0046] When light guided in the optical fiber 2 encounters one of the notches 7, it is redirected by this to the light extraction surface 6 in such a way that the angle of incidence there allows extraction from the light extraction surface 6.

[0047] Optically positioned behind and spaced apart from the light extraction surface 6, several light-deflecting prisms 8 are arranged in a series in the longitudinal direction x opposite the light extraction surface 6. The light-deflecting prisms 8 are arranged separately from one another on the light extraction surface and are not connected to each other, for example, by a common carrier film or similar. However, they can be connected to each other outside of a light path, for example, in the form of a single component, possibly manufactured in one piece. The light-deflecting prisms 8 are designed as profile bodies extending in a straight line in the width direction z, each with a particularly constant size and / or shape of cross-section, but this is not generally limited to them. The cross-section is, for example, a triangular cross-section.

[0048] The light-deflecting prisms 8 are manufactured separately from the light guide 2. Compared to the light guide 2, they can be made of a material with a refractive index n2 that is the same as or different from the refractive index n1 of the light guide n2, e.g., plastic or glass. Here, the light-deflecting prisms 8 exhibit, by way of example, different sizes, shapes, and / or orientations depending on the light coupling surface 4.

[0049] Figure 2 Figure 1 shows a simplified sketch of a section of the vehicle interior lighting device 1 in the area of ​​a longitudinal section of the light guide 2 with two identical notches 7 and two identical light deflecting prisms 8. The light deflecting prisms 8 have a length s, a height t and a width u.

[0050] In particular, the light-deflecting prisms 8 project laterally on both sides (i.e., in the width direction z) beyond the light extraction surface 6 of the light guide 2, or rather, protrude beyond it. Therefore, u > B. This advantageously achieves particularly reliable glare control.

[0051] The notches 7 are spaced apart along the longitudinal axis x by an edge-to-edge distance d. This distance can vary, for example, depending on the distance from the light coupling surface 4. The light deflecting prisms 8 are arranged between the notches 7 when viewed perpendicular to the light coupling surface 6 or with respect to their position along the longitudinal axis x.

[0052] The light-deflecting prisms 8 are arranged on the optical fiber 2, spaced apart from it by an air gap 9. This results in at least one change in refractive indices in each light path between the optical fiber 2 and the light-deflecting prisms 8, namely at the light-exit surface 6 of the optical fiber 2 to the air gap 9 and at the light-entry surface 10 of the respective light-deflecting prism 10. It is assumed that the refractive indices n1 and n2 differ from the refractive index n0 of air, and in particular are higher.

[0053] The light L deflected by the notches 7 is primarily extracted from the light extraction surface 6 in an area opposite the notches 7, as useful light LN, which passes between the light deflection prisms 8 without being influenced by them. This useful light area NB corresponds approximately to a solid angle of about ± 50° to the perpendicular of the light extraction surface 6.

[0054] However, starting from the notches 7, ("scattered light") components LS of the light L also strike the light extraction surface 6 at such a shallow angle that they then hit the light deflecting prisms 8 and are at least partially deflected by them into the useful light area NB. This is particularly advantageous because it not only avoids disturbing, especially potentially dazzling, scattered light LS, but also uses it to amplify the useful light LN.

[0055] The light-deflecting prisms 8 are advantageously shaped and arranged here in such a way as to achieve particularly effective light deflection and a high light output, such that at least one of the following conditions is met for them: The light-entry surface 10 is parallel or tangential to the opposite area of ​​the light-ejection surface 6; The length s of a light-deflection prism 8 is less than the distance d between two adjacent notches 7, in particular between two obliquely opposite adjacent notches 7; The angles • and • of the light-entry surface 10 to the other surfaces of the light-deflection prism 8 are each less than 90°; The height of the light-deflection prisms 8 is between 1 mm and 10 mm.

[0056] At least one such condition can also be generally considered advantageous. The angles • and • can be of the same or different magnitudes.

[0057] Figure 3Figure 1 shows a sectional view in front view of a section of a vehicle F with at least one interior lighting device 1 for illuminating a door T of the vehicle F. The interior lighting device 1 is housed in a casing in the area of ​​a headliner D. The associated or useful light area NB is directed towards the inside of the door T below a door window S as the illumination area.

[0058] The light-deflecting prisms 8 are arranged relative to the light guide 2 such that they deflect stray light LS directed from the light output surface 6 towards the side of the door T – e.g., towards a C-pillar C located behind a door window S – onto the door T. This achieves the advantage that a vehicle occupant is not dazzled by the vehicle interior lighting device 1 when they lean their head against the C-pillar C to relax. Experimental tests have shown that the intensity of otherwise disturbing stray light LS incident on the C-pillar C can be reduced by 90% to 95% by providing light-deflecting prisms 8.

[0059] In principle, one or more vehicle interior lighting devices 1 can be used to illuminate an area of ​​a vehicle interior or cabin.

[0060] The figures are merely schematic representations and serve only to illustrate the invention. Identical or equivalent elements are consistently identified by the same reference numerals.

[0061] Although in Figure 1 and Figure 2 While the vehicle interior lighting device 1 has been described using light-deflecting prisms 8 with a triangular cross-section, the cross-sectional shape can generally deviate from this, e.g., be trapezoidal. The advantageous conditions above for the light-deflecting prisms 8 with a triangular cross-section can then also apply, for example, to light-deflecting prisms with a trapezoidal cross-section.

[0062] The use of the vehicle interior lighting device is not limited to the door lighting under investigation, but can be used for all possible lighting tasks, especially indirect lighting tasks, in the vehicle interior.

[0063] In general, the direction of radiation and the opening angle of the useful light area can be adapted to a desired application by appropriately selecting the number, arrangement, shape and size of the light deflection prisms, and for different applications, possibly also using the same combination of light source and light guide, which allows for a particularly flexible and cost-effective design of the vehicle interior lighting device. REFERENCE MARK LIST

[0064] 1 Vehicle interior lighting device 2 Light guide 3 Light source 4 Light coupling surface 5 Light deflection surface 6 Light extraction surface 7 Notch 8 Light deflection prism 9 Air gap 10 Light entry surface of the light deflection prism B Width of the light guide CC pillar DD Headliner d Distance F Vehicle HH Height of the light guide LL Length of the light guide LNN Useful light LS Stray light NB Useful light range n0 Refractive index of air n1 Refractive index of the light guide n2 Refractive index of the light deflection prism ST Door glass s Length of the light deflection prism T Vehicle door t Height of the light deflection prism u Width of the light deflection prism x Longitudinal direction y Vertical direction z Broad direction • Angle • Angle

Claims

1. Vehicle interior lighting device (1), comprising • an elongated light guide (2) with at least one front-side light coupling-in surface (4), a longitudinal light deflection surface (5), and a longitudinal light decoupling surface (6) opposite the light deflection surface (5), wherein several light deflection regions (7) spaced apart from one another in the longitudinal direction (x) of the light guide (2) are present on the light deflection surface (5), and • at least one light source (3), the light (L) of which can be coupled into the light guide (2) at the at least one light coupling-in surface (4) and can be decoupled from the light guide (2) at the light decoupling surface (6) by means of light deflection at the light deflection surface (5), wherein • at least one light deflection prism (8) is optically arranged downstream of the light decoupling surface (6), • at least one jump between two refractive indices (n0, n1, n2) occurs in a light path between the light guide (2) and the at least one light deflection prism (8), and • the at least one light deflection prism (8) is arranged, when viewed perpendicular to the light decoupling surface (6), between two adjacent light deflection regions (7), characterized in that the at least one light deflection prism (8) is arranged, when viewed perpendicular to the light decoupling surface (6), completely between the light deflection regions (7).

2. Vehicle interior lighting device (1) according to claim 1 with several light deflection prisms (8), which are arranged separately from one another on the light decoupling surface (6).

3. Vehicle interior lighting device (1) according to one of the preceding claims, wherein the light guide (2) has a different refractive index (n1) than the at least one light deflection prism (8).

4. Vehicle interior lighting device (1) according to one of the preceding claims, wherein at least one light deflection prism (8) is a component manufactured separately from the light guide (2), has a different refractive index (n2) than the light guide (2), and rests directly on the light guide (2).

5. Vehicle interior lighting device (1) according to one of the preceding claims, wherein at least one light deflection prism (8) and the light guide (2) form a one-piece multicomponent component, and the at least one light deflection prism (8) has a different refractive index (n2) than the light guide (2).

6. Vehicle interior lighting device (1) according to one of the preceding claims, wherein at least one light deflection prism (8) is spaced apart from the light guide (2) by a gap (9).

7. Vehicle interior lighting device (1) according to claim 6, wherein the gap (9) is an air gap.

8. Vehicle interior lighting device (1) according to claim 6, wherein the gap (9) is a gap (9) filled with a solid material, the refractive index of which differs from a refractive index (n2) of at least the at least one light deflection prism.

9. Vehicle interior lighting device (1) according to one of the preceding claims with several light deflection prisms (8) spaced apart from one another in the longitudinal direction (x) of the light guide (2), wherein the light deflection prisms (8) are arranged, when viewed perpendicular to the light decoupling surface (6), in each case between two adjacent light deflection regions (7).

10. Vehicle interior lighting device (1) according to one of the preceding claims, wherein at least one light deflection prism (8) projects laterally at least on one side beyond the light decoupling surface (6) of the light guide (2).

11. Vehicle (F), comprising at least one vehicle interior lighting device (1) according to one of the preceding claims.

12. Vehicle according to claim 11, wherein at least one vehicle interior lighting device (1) is configured for illuminating a door (T), and the at least one light deflection prism (8) is arranged relative to the light guide (2) such that it deflects light (LS) directed from the light decoupling surface (6) toward a region next to a useful light region (NB), in particular next to a door (T), onto the useful light region (NB).