Blank for a lampshade, lampshade and modular illumination system using the same

Abstract

The invention relates to a blank (10) for a lampshade (20) made of a foldable, translucent material and to a lighting system (30) with such lampshades. The blank comprises a first quadrilateral (11), a second quadrilateral (12) connected to the first quadrilateral (11) via a first fold line (21), a third quadrilateral (13) connected to the second quadrilateral (12) via a second fold line (22), a fourth quadrilateral (14) connected to the third quadrilateral (13) via a third fold line (23), and a fifth quadrilateral (15) connected to the fourth quadrilateral (14) via a fourth fold line (24). The first quadrilateral (11) is mirror-symmetrical to the second quadrilateral (12) along the first fold line (21), and the fourth quadrilateral (14) is mirror-symmetrical to the fifth quadrilateral (15) along the fourth fold line (24). The second fold line (22) runs at an angle between 45° and 90° to the fourth fold line (24).

Description

[0001] The invention relates to a blank for the manufacture of a lampshade, such lampshades and a modular lighting system with one or more such lampshades.

[0002] From US patent 10,240,748 B2, various embodiments of lampshades are known, each comprising a hollow box with a central rectangular prism and two opposing triangular prism-shaped wings. These lampshades can be connected to light sources in different orientations relative to one another, so that several of these lampshades can be used to create modularly geometrically very different lighting systems.

[0003] These well-known lampshades are completely closed except for openings for inserting, for example, a rod-shaped light source, thus producing a very homogeneous light. Each lampshade can be manufactured from a single piece of a foldable, translucent material, comprising four squares hinged together in a row to form the cuboid, and trapezoids or triangles hinged to the squares to form the wings. If these lampshades are delivered to end users as space-saving pre-cut pieces, the end user must assemble the lampshades themselves by folding and gluing the squares, trapezoids, and triangles together, which is time-consuming and prone to errors. Alternatively, the well-known lampshade can also be delivered to the end user as a finished hollow box, which requires a correspondingly large transport volume and carries the risk of damage during transport.

[0004] It is therefore an object of the present invention to provide a blank for the manufacture of a lampshade as well as lampshades or lighting systems manufactured therefrom which are improved with regard to transport and assembly possibilities and enable more accentuated lighting.

[0005] This problem is solved by a cut with the features of claim 1, a lampshade according to claim 7 and a lighting system according to claim 12.

[0006] A lampshade blank according to the invention consists of a foldable, translucent material, such as paper, thin cardboard, plastic film, and similar materials with varying light transmittance. The blank comprises a first quadrilateral, a second quadrilateral directly connected to the first quadrilateral via a first fold line, a third quadrilateral directly connected to the second quadrilateral via a second fold line, a fourth quadrilateral directly connected to the third quadrilateral via a third fold line, and a fifth quadrilateral directly connected to the fourth quadrilateral via a fourth fold line. In other words, the five quadrilaterals are connected to one another via the fold lines. It is generally preferred that all fold lines and all other lines bounding the quadrilaterals are straight lines. However, it is also possible for some of the lines bounding the quadrilaterals to be curved.This applies, for example, to the free edges of the fourth and fifth quadrilaterals, which meet at the ends of the fourth fold line. The first quadrilateral can be mirror-symmetrical to the second quadrilateral along the first fold line, and the fourth quadrilateral can be mirror-symmetrical to the fifth quadrilateral along the fourth fold line. Therefore, these quadrilaterals are suitable for being unfolded congruently onto one another.

[0007] Folding lines can be creases or die-cuts, cut lines, perforated lines or marked lines along which two areas of a blank can be pivoted towards each other and / or folded onto each other.

[0008] If the second fold line runs perpendicular or obliquely, for example at an angle between about 45° and 90°, in particular at an angle between about 75° and 90°, to the fourth fold line, a lampshade can be folded from two connected pieces, which is formed from a hexahedron or truncated pyramid open on two opposite sides with two wings provided on the sides.

[0009] The invention is based on the idea that both the production of the blank itself and the production of a lampshade can be simplified by combining, for example, two, in particular two similar, i.e., nearly identical, or identical, blanks to form a lampshade. According to the invention, the blank essentially consists only of the first, second, third, fourth, and fifth quadrilaterals, and optionally one or more adhesive tabs. This allows foldable lampshades to be produced from two interconnected blanks, which can be transformed from a flat, pre-assembled transport state into an unfolded state for use. In this way, space-saving and safe transport of the lampshades is possible, and they can be unfolded and used by an end user with minimal effort and without the risk of assembly errors.

[0010] Nearly identical cutouts are defined here as those whose basic structure, including the first through fifth quadrilaterals and any gluing tabs, is identical, but where the dimensions of the individual quadrilaterals vary. An example of two nearly identical cutouts are two cutouts that can be joined to form a lampshade using the gluing tabs, where the third quadrilateral is trapezoidal in each case. In one of these cutouts, the first and second quadrilaterals are positioned along the wider edge of the trapezoidal third quadrilateral, whereas in the other cutout, the (correspondingly slightly smaller) first and second quadrilaterals are positioned along the narrower edge of the trapezoidal third quadrilateral. Another example of nearly identical cutouts are two cutouts that, while having identical proportions, differ only in size.While only straight lampshades can be produced with exactly identical cuts, conical or spindle-shaped lampshades can also be produced with almost identical cuts.

[0011] Alternatively, according to the invention, it is also possible for a lampshade to consist of a single cut-out, which essentially consists only of two first, two second, two third, two fourth and two fifth squares and optionally of one or more adhesive tab(s).

[0012] Furthermore, the significantly smaller number of surfaces compared to the lampshades known from US 10,240,748 B2 means that the lampshade is partially open to the outside, resulting in accentuated lighting from both direct and diffused light. Prefabrication is also considerably simpler because the number of adhesive tabs to be attached per lampshade can be significantly reduced, for example, to four adhesive tabs for a pair of two cutouts according to the invention, compared to ten adhesive tabs for the cutout according to US 10,240,748 B2.

[0013] In a preferred embodiment of the blank, it can have a first adhesive tab connected to the fifth quadrilateral via a fifth fold line. If this first adhesive tab is provided in a mirror-symmetrical manner along the fourth fold line relative to the third quadrilateral, this first adhesive tab of one blank and the third quadrilateral of another identically designed blank can be bonded congruently to one another. A further advantage of this design according to the invention is that the wall of the lampshade formed by the third quadrilateral emits uniform light across its entire surface when illuminated. This differs from known lampshades where the adhesive tabs, which do not extend over the entire surface of a wall, can be clearly visible when illuminated due to the only locally present doubling of material.

[0014] Alternatively or additionally, a second adhesive tab connected to the first or third quadrilateral via a sixth fold line can be provided to join two edges of the hexahedron or truncated pyramid. The sixth fold line can run parallel to the first and / or second fold line.

[0015] The first quadrilateral can, together with the second quadrilateral, form a square with a central opening, for example, a circular cutout, through which the first fold line passes. The second adhesive tab is preferably connected to the first quadrilateral. Since, in a preferred arrangement within a lighting system consisting of several lampshades, this quadrilateral, together with the second quadrilateral, forms a square that is not visible from the outside, it is not necessary to avoid material doubling at this point. Therefore, the second adhesive tab does not need to have the same size and shape as the square formed by the first and second quadrilaterals.

[0016] From the cutout according to the invention, together with a second such cutout, a lampshade can be formed whose wings, formed from the fourth and fifth quadrilaterals, are conical, i.e., the distance between the outer wing corners at one end of the fourth fold line differs from the distance between the outer wing corners at the other end of the fourth fold line. In this embodiment, the third quadrilateral can be an isosceles trapezoid and the fourth quadrilateral can be a convex quadrilateral. This conicity of the lampshade formed from the cutout can be used to create a lighting system that tapers or widens in certain areas. Furthermore, such conicity allows the outer wing corners of two lampshades to be interlocked. This results in an attractive appearance and can improve the stability of the lampshades relative to each other in a lighting system.In this design, the second fold line runs diagonally to the fourth fold line.

[0017] Alternatively, the second fold line can be perpendicular to the fourth fold line. The third quadrilateral can then be a rectangle, and the fourth quadrilateral can be a trapezoid, for example, an isosceles trapezoid.

[0018] In order to be able to slightly overlap the lampshades with their wings formed by the fourth and fifth quadrilaterals, the length of the fourth fold line can be slightly greater than twice the length of the third or fifth fold lines.

[0019] The above-mentioned task is also solved by a lampshade that can be transformed from a flat, prefabricated transport state into an unfolded state of use and consists of two interconnected cutouts of the above-mentioned type or of a single cutout that essentially consists only of two first, two second, two third, two fourth and two fifth quadrilaterals and optionally of one or more adhesive tab(s).

[0020] In a preferred embodiment of the lampshade, consisting of two identical blanks, each blank has a first adhesive tab connected to the fifth quadrilateral via the fifth fold line. This tab is positioned symmetrically to the third quadrilateral along the fourth fold line. The first adhesive tab of one blank is congruently connected to the third quadrilateral of the other blank. Furthermore, each blank can have a second adhesive tab connected to either the first or the third quadrilateral via the sixth fold line. The second adhesive tab of one blank is connected to the third quadrilateral or the first quadrilateral of the other blank.

[0021] In the flat, pre-assembled transport state of the lampshade according to the invention, preferably the fourth quadrilateral of each of the two blanks is folded along the fourth fold line onto the fifth quadrilateral of the same blank, and the first quadrilateral of each of the two blanks is folded along the first fold line onto the second quadrilateral of the same blank, with the third quadrilaterals of the two blanks, together with the optional first adhesive tabs, lying congruently on top of each other. In this flat, pre-assembled transport state, the lampshade can be transported and stored in a space-saving and safe manner.

[0022] It is preferred that the lampshade can be transformed from its flat, pre-assembled transport state into its unfolded state for use by pivoting the first and second quadrilaterals of each of the two blanks along the first fold line so that the first and second quadrilaterals of the respective blank lie in a common plane. This causes the congruent third quadrilaterals of the two blanks, possibly together with their respective first gluing tabs, to move apart, so that the first, second, and third quadrilaterals form a hexahedron or truncated pyramid open on two opposite sides, with two wings attached to its sides. The wings are formed by the fourth and fifth quadrilaterals, which, in the unfolded state for use, remain connected to each other along the fourth fold line, but are separated at opposite edges, i.e.,at the third or fifth fold line, spaced apart from each other.

[0023] A lighting system according to the present invention comprises at least one light source and at least one lampshade of the type mentioned above, which partially surrounds the light source. The light source can be rod-shaped, for example, as an LED strip. In one example, several lampshades are arranged, each offset by 90° from one another, to partially surround the light source.

[0024] A lighting system that tapers or widens vertically can be created by using multiple lampshades of varying sizes. For example, in at least one lampshade, the third quadrilateral is a rectangle, and in at least one other, the third quadrilateral is a trapezoid. In other words, a lighting system can have several identical lampshades, several lampshades of different sizes but the same design, and / or lampshades of different designs. If the light source is enclosed in a transparent tube, the lampshades can be stacked on top of this tube. By varying the orientation and arrangement of the lampshades, lighting systems with different visual appearances can be created.

[0025] The lighting system may also have a base or foot, in which, for example, the electronics for controlling the light source are provided.

[0026] The material for cutting can be, for example, a flame-retardant insulating film made of polypropylene. These are characterized by good foldability, die-cuttableness, dimensional stability, and tensile strength, and meet the UL94 V-0 fire protection class. Furthermore, such films are also wipeable.

[0027] The invention is explained in more detail below with reference to an exemplary embodiment and the drawing. All features described and / or illustrated, individually or in any combination, constitute the subject matter of the invention, irrespective of their compilation in the claims or their cross-references.

[0028] They show schematically: Figure 1a a cut according to the invention according to a first embodiment, Figure 1 legs to Figure 1a nearly identical cut according to the invention according to the first embodiment, Figure 1c a one-piece cut according to the first embodiment, Figure 2a-h the steps for manufacturing a lampshade according to the invention from two cuts, Figure 3a-g the steps for manufacturing a lighting system according to the invention according to a first alternative, Figure 4a-d views of the lighting system according to Figure 3 Figures 5a-d show views of a lighting system according to a second alternative, Figures 6a-d show views of a lighting system according to a third alternative, Figures 7a-d show views of a lighting system according to a fourth alternative, Figure 8a shows a pair of two blanks for producing a lampshade according to the invention, and Figure 8 shows a single blank for producing a lampshade according to the invention.

[0029] The one in the Figures 1a or 1bThe cutout 10A, 10B shown for the production of a lampshade 20 from a foldable, translucent material, such as paper, thin cardboard or plastic film, essentially consists of five hinged surfaces with two additional adhesive tabs. In detail, each cutout 10A, 10B has a first quadrilateral 11, here a rectangle, a second quadrilateral 12, also rectangular, connected to the first quadrilateral 11 via a first fold line 21, a third quadrilateral 13, in the shape of an isosceles trapezoid, connected to the second quadrilateral 12 via a second fold line 22, a fourth quadrilateral 14 connected to the third quadrilateral 13 via a third fold line 23, and a fifth quadrilateral 15 connected to the fourth quadrilateral 14 via a fourth fold line 24. Furthermore, the cutout 10A or 10B hasFigure 10B shows a first adhesive tab 16, which is hinged to the fifth quadrilateral via a fifth fold line 25, and a second adhesive tab 17, which is hinged to the third quadrilateral 13 via a sixth adhesive tab 26. Alternatively, the second adhesive tab 17 can also be hinged to the first quadrilateral 11 on the edge opposite the first fold line 21.

[0030] Cutouts 10A and 10B of the Figures 1a and 1bare almost identical to each other, as they correspond with regard to the design and arrangement of quadrilaterals 11 to 15, 16 and 17 and the fold lines 21 to 25. However, the sizes of quadrilaterals 11 and 12 of cutouts 10A and 10B are slightly different, which also results in slight differences in the proportions of quadrilaterals 13 and 17. Cutouts 10A and 10B can be glued together by aligning the first adhesive tab 16 of cutout 10A with the third quadrilateral 13 of cutout 10B. The cutouts 10A and 10B joined in this way then have the appearance of the single-piece cutout 10. Figure 1c .

[0031] As from Figure 1aAs can be seen, the first quadrilateral 11 is mirror-symmetrical to the second quadrilateral 12 along the first fold line 21, and the fourth quadrilateral 14 is mirror-symmetrical to the fifth quadrilateral 15 along the fourth fold line 24. In addition, the third quadrilateral 13 and the first glue tab 16 are mirror-symmetrical to each other along the fourth fold line 24.

[0032] In the illustrated embodiment, the first fold line 21, the second fold line 22, and the sixth adhesive flap 26 are parallel to each other. The third fold line 23, the fourth fold line 24, and the fifth fold line 25 run slightly obliquely to each other in the illustrated embodiment and are inclined at approximately 1° to approximately 5° to the perpendicular on the first fold line 21. In principle, the third fold line 23, the fourth fold line 24, and the fifth fold line 25 can also run at a significantly steeper inclination, e.g., at an angle between 45° and 90° to the first fold line 21. According to an alternative embodiment, which is shown in Figure 2 As shown, the third fold line 23, the fourth fold line 24 and the fifth fold line 25 are parallel to each other and perpendicular to the first fold line 21. This makes the third quadrilateral 13 and the first glue tab 16 rectangles and the fourth and fifth quadrilaterals 14, 15 trapezoids.

[0033] The first quadrilateral 11 and the second quadrilateral 12 together form a square, in the middle of which a circular opening 18 is provided, through which the first fold line 21 runs.

[0034] The Figures 2a to 2h The steps for constructing a lampshade 20 from two cutouts 10A, 10B, which, with the above-mentioned difference in the inclination of the fold lines, are essentially the same as cutout 10. Figure 1a correspond. In Figure 2a The first adhesive tab 16 of the cutout 10A is glued congruently onto the third square 13 of the cutout 10B.

[0035] The cutouts 10A and 10B are oriented towards each other such that the first quadrilaterals 11 of the two cutouts point in opposite directions. The nearly identical cutouts 10A and 10B are in the Figures 1a and 1b shown or in a slightly modified alternative in Figure 8bIt can be seen that these differ in that the first quadrilateral 11 and the second quadrilateral 12 of the left-hand cutout 10A in the figure are hinged at the wider edge (second fold line 22) of the trapezoidal third quadrilateral 13, whereas the first quadrilateral 11 and the second quadrilateral 12 of the right-hand cutout 10B in the figure are hinged at the narrower edge (second fold line 22) of the trapezoidal third quadrilateral 13. Accordingly, the second adhesive tabs 17 of the nearly identical cutouts 10A and 10B are also of different widths. Alternatively, see Figures 1c and 8a Each one individual cutout 10, from which a lampshade 20 can be made.

[0036] It is evident that instead of constructing a lampshade 20 from two identical cutouts 10A, 10B which are attached to each other, a single cutout can also be used, which, with the exception of the material doubling by gluing the first adhesive tab 16 of cutout 10A to the third square 13 of cutout 10B, the Figure 2a The configuration shown can be used. In other words, such a single-piece cut would have exactly one less surface area than the combination of two cuts, namely one of the first adhesive tabs 16 would be omitted.

[0037] As the Figures 2b to 2eAs shown, the interconnected cutouts 10A and 10B are then folded together along their respective fourth fold lines 24, so that the first adhesive tab 16 of cutout 10B can be glued congruently onto the third quadrilateral 13 of cutout 10A. Subsequently, the first and second quadrilaterals 11 and 12 of each cutout can be brought into a common plane. The second adhesive tabs 17 can then be connected to the first quadrilaterals 11. This state is shown in Figure 2f shown and corresponds to the upright, used state of the lampshade. In this state, the first, second, and third quadrilaterals 11, 12, and 13 of the two cutouts 10A and 10B together form a cuboid open on two opposite sides ( Figure 2 ) or truncated pyramid (when using the cutouts according to Figure 1). The fourth and fifth quadrilaterals 14, 15 each form wings that are provided on the respective open side of the cuboid or truncated pyramid.

[0038] The lampshade 20 can be made starting from the one in Figure 2f to reversibly bring the shown state into a flat, prefabricated transport state by unfolding the first and second quadrilaterals 11, 12 on top of each other along the first fold line 21 ( Figure 2g ), until the flat transport state is reached, which is in Figure 2h As shown. From this, the lampshade 20 can be returned to its unfolded state of use by bringing the first and second quadrilaterals 11, 12 back into a plane.

[0039] The Figures 3a to 3gThe figures show how a lighting system 30 can be manufactured from several lampshades 20. This system has, for example, a base or foot 31 in which electronic elements (not shown) may be provided. A transparent tube 32 is fixed to the foot and can extend vertically upwards as shown. At least one light source, for example an LED strip (not shown), is provided in this transparent tube 32. In the area of ​​the transparent tube 32 facing the foot 31, a shorter tube 33 is provided surrounding it; this shorter tube may, for example, be opaque.

[0040] Lampshades 20 can now be attached to the transparent tube 32 by inserting it through the through-openings 18. As shown in Figure 3bAs shown, the opaque tube 33 supports the first lampshade, keeping it at a distance from the base 31. Subsequent lampshades can then be placed on the transparent tube 32, rotated, for example, 90° relative to the lampshade below. Figures 3c to 3g The wings of the third lampshade can engage with the upward-pointing tips of the first lampshade with their downward-pointing points (or vice versa). Similarly, the wings of the second lampshade can engage with those of the fourth lampshade, and so on. As a result, the fourth fold lines 24 of the lampshades form an approximately continuous outer edge of the lighting system 30 and stabilize each other.

[0041] In order to be able to insert the lampshades 20 into each other slightly overlapping as described, the length of the fourth fold line 24 is slightly more than twice the length of the third and fifth fold lines 23, 25.

[0042] In the Figures 4a to 4d is a fully assembled lighting system with, for example, 15 lampshades in perspective view ( Figure 4a ), from one side ( Figure 4b ), from an adjacent side ( Figure 4c ) and from above ( Figure 4d ) shown. It can be seen that, unlike the other lampshades, the square formed by the first and second quadrilaterals 11, 12 of the uppermost lampshade does not have a through-opening 18 to close off the transparent tube 32 at the top.

[0043] Regarding the lampshades 20 of the in Figure 4 The lighting system 30 shown consists of identical or nearly identical lampshades.

[0044] This results in a lighting system with a roughly constant width. The lampshades can differ slightly in dimensions, as shown in the example, to facilitate the interlocking of the wings.

[0045] Figures 5a to 5dshow in perspective view ( Figure 5a ), from one side ( Figure 5b ), from an adjacent side ( Figure 5c ) and from above ( Figure 5d ) a slightly modified embodiment of a lighting system according to the invention, in which significantly different sized lampshades are used. In the cutouts of these lampshades, the third fold line 23, the fourth fold line 24 and the fifth fold line 25 (with the exception of the middle lampshade) also run at a significantly steeper inclination to the first fold line 21. As a result, the fourth fold lines 24, which form the outer edges, together create a line that appears curved.

[0046] Figures 6a to 6d show in perspective view ( Figure 6a ), from one side ( Figure 6b ), from an adjacent side ( Figure 6c ) and from above ( Figure 6d) another modified embodiment of a lighting system 30 according to the invention, in which even more distinctly different-sized lampshades are used. This allows the lighting system 30 to be designed conically.

[0047] Figures 7a to 7d show in perspective view ( Figure 7a ), from one side ( Figure 7b ), from an adjacent side ( Figure 7c ) and from above ( Figure 7d ) another embodiment of a lighting system 30 according to the invention, in which identical lampshades 20 are used, whereby the lighting system 30 is designed straight.

[0048] It is evident that with the modular lighting system 30, by using different lampshades 20 which can be stacked on top of each other in different sequences, a great many different contours of the lighting system can be created.

[0049] Since the cuboids or truncated pyramids of the lampshades are open on two opposite sides, light from the transparent tube 32 enters laterally into the (in the assembled state of the Figures 3 to 7 ) wings open upwards and downwards. This creates a pattern of areas with direct lighting and areas of lighting largely shielded by the closed surfaces of the lampshades. Reference symbol list

[0050] 10, 10A, 10B Cutout 11 First square 12 Second square 13 Third square 14 Fourth square 15 Fifth square 16 First glue tab 17 Second glue tab 18 Through opening 20 Lampshade 21 First fold line 22 Second fold line 23 Third fold line 24 Fourth fold line 25 Fifth fold line 26 Sixth fold line 30 Lighting system 31 Foot 32 Transparent tube 33 Opaque tube

Claims

1. Cutout for a lampshade made of a foldable, translucent material, wherein the cutout comprises a first quadrilateral (11), a second quadrilateral (12) connected to the first quadrilateral (11) via a first fold line (21), a third quadrilateral (13) connected to the second quadrilateral (12) via a second fold line (22), a fourth quadrilateral (14) connected to the third quadrilateral (13) via a third fold line (23), and a fifth quadrilateral (15) connected to the fourth quadrilateral (14) via a fourth fold line (24), wherein the first quadrilateral (11) is mirror-symmetrical to the second quadrilateral (12) along the first fold line (21), and the fourth quadrilateral (14) is mirror-symmetrical to the fifth quadrilateral (15) along the fourth fold line (24). characterized by the fact thatthe second fold line (22) runs at an angle between 45° and 90° to the fourth fold line (24), and that the cut consists of the first, second, third, fourth and fifth squares (11) and optionally at least one glue tab (16, 17).

2. Cutting according to claim 1, characterized by the fact that a first adhesive tab (16) connected to the fifth quadrilateral (15) via a fifth fold line (25) is provided along the fourth fold line (24) in a mirror symmetrical manner to the third quadrilateral (13).

3. Cutting according to claim 1 or 2, characterized by the fact that a second adhesive tab (17) is provided which is connected to the first quadrilateral (11) and / or the third quadrilateral (13) via a sixth fold line (26), wherein the sixth fold line (26) runs parallel to the first and / or second fold line (21, 22).

4. Cutting according to one of the preceding claims, characterized by the fact thatthe first quadrilateral (11) together with the second quadrilateral (12) forms a square which has a central opening (18) through which the first fold line (21) passes.

5. Cutting according to one of the preceding claims, characterized by the fact that the third quadrilateral (13) is an isosceles trapezoid and the fourth quadrilateral (14) is a convex quadrilateral.

6. Cutting according to one of claims 1 to 4, characterized by the fact that the third quadrilateral (13) is a rectangle and the fourth quadrilateral (14) is a trapezoid.

7. Lampshade that can be transformed from a flat, pre-assembled transport state into an unfolded state for use, characterized by the fact thatthe lampshade (20) consists of two interconnected blanks (10A, 10B) according to one of the preceding claims or consists of a single blank with two first, two second, two third, two fourth and two fifth quadrilaterals (11, 12, 13, 14, 15) and optionally a first adhesive tab (16) and two second adhesive tabs (17).

8. Lampshade according to claim 7, characterized by the fact that Each of the two cutouts (10A, 10B) has the first adhesive tab (16) connected via the fifth fold line (25) to the fifth quadrilateral (15), which is provided along the fourth fold line (24) in a mirror-symmetrical manner to the third quadrilateral (13), and that the first adhesive tab (16) of one of the two cutouts (10A, 10B) is connected to the third quadrilateral (13) of the other of the two cutouts (10A, 10B) in a congruent manner.

9. Lampshade according to claim 7 or 8, characterized by the fact thatEach of the two cutouts (10A, 10B) has the second adhesive tab (17) connected to the first quadrilateral (11) and / or the third quadrilateral (13) via the sixth fold line (26), and that the second adhesive tab (17) of one of the two cutouts (10A, 10B) is connected to the third quadrilateral (13) or the first quadrilateral (11) of the other of the two cutouts (10A, 10B).

10. Lampshade according to one of claims 7 to 9, characterized by the fact thatIn the flat, prefabricated transport state, the fourth quadrilateral (14) of each of the two blanks (10A, 10B) is folded along the fourth fold line (24) onto the fifth quadrilateral (15) of the same blank (10A, 10B), and the first quadrilateral (11) of each of the two blanks (10A, 10B) is folded along the first fold line (21) onto the second quadrilateral (12) of the same blank (10A, 10B), with the third quadrilaterals (13) of the two blanks (10A, 10B) lying congruently on top of each other together with the optional first adhesive tabs (16).

11. Lampshade according to claim 10, which can be transformed from the flat prefabricated transport state into the unfolded use state by pivoting the first quadrilateral (11) and the second quadrilateral (12) of each of the two blanks (10A, 10B) along the first fold line (21) so that the first quadrilateral (11) and the second quadrilateral (12) of the respective blank (10A, 10B) lie in a common plane.

12. Lighting system comprising at least one light source and at least one lampshade (20) surrounding it in some area according to one of claims 7 to 11.

13. Lighting system according to claim 12, characterized by the fact that the light source is rod-shaped, and several lampshades (20) are provided to surround the light source in areas, each offset by 90° to each other.

14. Lighting system according to claim 13, characterized by the fact thatthe lampshades (20) are of different sizes and / or that in at least one lampshade the third quadrilateral (13) is a rectangle and in at least one lampshade the third quadrilateral (13) is a trapezoid.

15. Lighting system according to claims 12 to 14, which additionally has a base or foot (31).

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