Light-producing assembly for a spotlight and spotlight

Abstract

A light-producing assembly for a spotlight for illuminating film, studio, stage, event and/or theater surroundings comprises a carrier, on which an LED arrangement with a multiplicity of LEDs is arranged. Here, the LEDs are provided by N>2 different color types. The assembly also comprises a line system for supplying power to the LEDs, which comprises a multiplicity of lines with N line types, wherein lines of different line types cross in crossing regions and the crossing regions lie outside of a vertical projection surface of footprint sides of the LEDs in a vertical plan view of the carrier front side. Further, the assembly comprises an optical unit coupled to the LED arrangement, said optical unit spanning the totality of the LEDs. Moreover, a spotlight comprises such a light-producing assembly.

Claims

1. A light-producing assembly for a spotlight for illuminating film, studio, stage, event and/or theater surroundings, comprising a carrier, on which an LED arrangement with a multiplicity of LEDs is arranged, wherein the LEDs comprise LEDs with N>2 different color types and any number of LEDs is provided for each of the N color types, and wherein a footprint side of one of each of the LEDs faces a carrier front side, wherein the carrier is embodied as a single layer circuit board; a line system for supplying power to the LEDs, comprising a multiplicity of lines with N line types, wherein lines of different line types cross in crossing regions and the crossing regions lie outside of a vertical projection surface of the footprint sides on the carrier front side in a vertical plan view of the carrier front side; and an optical unit coupled to the LED arrangement, said optical unit spanning the totality of the LEDs and being embodied to receive and form the light emanating from each of the LEDs.

2. The assembly as claimed in claim 1, wherein the crossing lines extend one above the other in a direction vertical to a carrier front side and the crossing lines are integrated into the carrier in the respective crossing region or one of the crossing lines is embodied as a bonding bridge which spans the respective other crossing line.

3. The assembly as claimed in claim 2, wherein all LEDs are arranged according to a regular grid on the carrier front side, according to which: a multiplicity of grid tracks that do not overlap and that are arranged at a transverse distance from one another are provided on the carrier front side; each grid track comprises a multiplicity of grid holding areas, an LED being positionable therein in each case, wherein the grid holding areas are arranged individually in succession along a fictitious trajectory from the grid track entrance to the grid track exit; a protective apparatus acting as a diffuser, which is provided at a light emergence side of the optical unit and at least one LED of each of the N different color types is provided in each of at least 90% of all grid tracks, wherein the LEDs are arranged in any sequence within the grid tracks; wherein the optical unit is embodied as a conical or polygonal reflector, wherein the optical unit has a light entry opening and a light emergence opening, which are connected by way of a light-guiding section, wherein an inner side of the light-guiding section is reflective; and wherein, in a plan view of the carrier front side, an envelope of the multiplicity of LEDs is a closed polygonal chain, a circle or an oval, and an edge region of the light entry opening corresponds to the envelope in respect of its form and its size.

4. The assembly as claimed in claim 3, wherein the optical unit is embodied as a reflector with a hexagonal cross-sectional area.

5. The assembly as claimed in claim 4, further comprising a protective apparatus acting as a diffuser, wherein the diffuser is a stochastic diffuser, which is provided at a light emergence side of the optical unit.

6. The assembly as claimed in claim 4, further comprising a protective apparatus acting as a diffuser, wherein the diffuser is a holographic diffuser, which is provided at a light emergence side of the optical unit.

7. The assembly as claimed in claim 1, wherein all LEDs are arranged according to a regular grid on the carrier front side, according to which: a multiplicity of grid tracks that do not overlap and that are arranged at a transverse distance from one another are provided on the carrier front side; each grid track comprises a multiplicity of grid holding areas, an LED being positionable therein in each case, wherein the grid holding areas are arranged individually in succession along a fictitious trajectory from the grid track entrance to the grid track exit; and at least one LED of each of the N different color types is provided in each of at least 90% of all grid tracks, wherein the LEDs are arranged in any sequence within the grid tracks.

8. The assembly as claimed in claim 1, wherein the optical unit is embodied as a conical or polygonal reflector.

9. The assembly as claimed in claim 1, further comprising a protective apparatus acting as a diffuser, which is provided at a light emergence side of the optical unit.

10. The assembly as claimed in claim 1, wherein the optical unit is a singular collimation optical unit.

11. The assembly as claimed in claim 1, wherein the optical unit has a light entry opening and a light emergence opening, which are connected by way of a light-guiding section, wherein an inner side of the light-guiding section is reflective.

12. The assembly as claimed in claim 11, wherein, in a plan view of the carrier front side, an envelope of the multiplicity of LEDs is a closed polygonal chain, a circle or an oval, and an edge region of the light entry opening corresponds to the envelope in respect of its form and its size.

13. A spotlight comprising a light-producing assembly as claimed in claim 1.

14. The assembly as claimed in claim 1, wherein the optical unit is embodied as a reflector with a hexagonal cross-sectional area.

15. The assembly as claimed in claim 1, further comprising a protective apparatus acting as a diffuser, wherein the diffuser is a stochastic diffuser, which is provided at a light emergence side of the optical unit.

16. The assembly as claimed in claim 1, further comprising a protective apparatus acting as a diffuser, wherein the diffuser is a holographic diffuser, which is provided at a light emergence side of the optical unit.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The parts shown in the figures are not necessarily true to scale; rather, the emphasis lies in presenting principles of the invention. Further, the same reference signs in the figures denote parts that correspond to one another. In the figures:

(2) FIG. 1 schematically shows a spotlight in exemplary fashion, comprising a light-producing assembly according to one or more embodiments;

(3) FIG. 2 schematically shows a light-producing assembly in exemplary fashion, as per one or more embodiments;

(4) FIG. 3 schematically shows aspects of a light-producing assembly in exemplary fashion, where N=3 color types are provided, as per one or more embodiments;

(5) FIG. 4 schematically shows aspects of another light-producing assembly in exemplary fashion, where N=4 color types are provided, as per one or more embodiments; and

(6) FIG. 5 schematically shows aspects of an additional light-producing assembly in exemplary fashion, where N=4 color types are provided, as per one or more embodiments;

(7) FIG. 6 schematically shows alternative profiles of bonding bridges of a light-producing assembly in exemplary fashion, as per one or more embodiments; and

(8) FIG. 7 schematically shows variants of a light-producing assembly in exemplary fashion, said variants being equipped with protective apparatuses, as per one or more embodiments.

DETAILED DESCRIPTION

(9) The following detailed description refers to the attached drawings, which belong thereto and which show, by the elucidation of specific embodiments, how the invention can be implemented in practice.

(10) In this context, directional terminology such as, e.g., “above”, “below”, “backward”, “disposed in front of”, “disposed behind”, “disposed downstream”, “disposed upstream”, etc., can be used with reference to the alignment of the figures being described. Further, terms such as “in front of”, “following” or “behind” may denote the arrangement of components in relation to the direction of the light beams. By way of example “following the lens” means an area facing the light emergence side of the lens. Since parts of embodiments can be positioned in a number of different alignments, the directional terminology can be used for elucidation purposes, but is by no means restrictive. Reference is made to the fact that other embodiments can be applied and structural or logical modifications can be carried out without departing from the scope of protection of the present invention. The following detailed description should therefore not be interpreted in a restrictive sense and the scope of protection of the present invention is defined by the attached claims.

(11) Reference is now made in detail to various embodiments and to one or more examples, which are elucidated in the figures. Each example is presented in explanatory fashion and should not be interpreted as a restriction of the invention. By way of example, elucidated features or features described as part of one embodiment may be applied to, or in conjunction with, other embodiments in order to give rise to an even further embodiment. It is intended that the present invention comprises such modifications and variations. The examples are described using specific language, which should not be construed as restricting the scope of protection of the attached claims. The drawings are not reproduced true to scale and merely serve for elucidating purposes. If nothing else is specified, the same elements have been denoted by the same references in the various drawings for the purposes of a better understanding.

(12) FIG. 1 shows a spotlight 10 with a light-producing assembly 12. The latter is arranged in the interior of a spotlight housing 14, for example.

(13) The spotlight 10 can emit light along one direction 16.

(14) The light-producing assembly 12 comprises an LED arrangement 18 (see FIG. 2) and an optical unit 20 coupled to the LED arrangement 18. The optical unit 20 is embodied as, for example, a conical or polygonal reflector, e.g., as a reflector with a hexagonal cross-sectional area. By way of example, the optical unit 20 is embodied as a singular collimation optical unit in the form of a collimation reflector 22.

(15) The LED arrangement 18 further comprises a carrier 24 and a multiplicity of LEDs 26, only a few of which have been provided with reference signs.

(16) The LEDs 26 are all positioned on a carrier front side 28 of the carrier 24. Here, a footprint side (e.g., solder side) of the LEDs 26 always faces the carrier front side 28.

(17) The LEDs 26 comprise LEDs with N>2 different color types, wherein a multiplicity of LEDs are provided for each of the N color types (see FIGS. 3 to 5).

(18) By way of example, N is 4 and the color types are white, red, green and blue.

(19) In order to supply electrical power to the LEDs 26, the light-producing assembly 12 moreover comprises a line system 30, which is at least partly integrated into the carrier 24 (see FIGS. 3 to 5, in particular). Here, the line system has N line types, which each supply the LEDs 26 of the associated color type N in terms of power.

(20) In the embodiments according to FIGS. 3 to 5, lines of different line types cross in crossing regions 32, with, once again, only some of the crossing regions 32 having been provided with reference signs. Here, in a vertical plan view of the carrier front side 28, the crossing regions 32 lie outside of a vertical projection surface of the footprint sides of the LEDs 26 on the carrier front side 28.

(21) Moreover, the crossing lines extend above or below one another in a direction vertical to the carrier front side 28. Here, they are electrically insulated from one another, i.e., not connected. Both of the crossing lines may be integrated into the carrier 24 in the crossing region 32. Then, the carrier 24 has a multi-layer embodiment, at least in the crossing region 32. Additionally, the carrier 24 may have a single layer embodiment and one of the crossing lines may be embodied as a bonding bridge 33 (e.g., above and below the carrier 24). By way of example, the carrier 24 is embodied as an entirely single layer circuit board and bonding bridges are used (instead of multi-layer portions) for the purposes of forming the crossing regions.

(22) Exemplary embodiments of bonding bridges 33 are illustrated in FIG. 6. Here, the bonding bridges 33a to 33d shown in this figure should be understood to be alternatives, which can be applied in any combination.

(23) The bonding bridge 33a extends directly from one of the LEDs 26 to a main conductor track 38. In the process, it bridges over another main conductor track 38.

(24) The bonding bridge 33b extends from an edge or corner of an LED 26 to a main conductor track 38 situated at the opposite edge or corner of the LED 26. In the process, the bonding bridge 33b bridges over both the LED 26 and a further main conductor track 38.

(25) The bonding bridge 33c extends from one LED 26 to another LED 26. In the process, it bridges over a main conductor track 38.

(26) The bonding bridge 33d is connected to main conductor tracks 38 on both sides and bridges over a further main conductor track 38.

(27) As illustrated in FIGS. 3 to 5, all LEDs 26 are arranged according to a regular grid on the carrier front side 28. In this context, a multiplicity of grid tracks 34 that do not overlap and that are arranged at a transverse distance from one another are provided. Here, each grid track 34 comprises a multiplicity of grid holding areas, on which respectively one LED 26 is positionable. Here, the grid holding areas are arranged individually in succession along a trajectory 36 from a grid track entrance to a grid track exit.

(28) All grid holding areas are occupied by LEDs 26 in the illustrated embodiments.

(29) Here, at least one LED 26 of each of the N different color types is provided in each of at least 90% of all grid tracks 34. Here, the LEDs 26 of the different color types are positioned in any sequence.

(30) Here, the value of at least 90% means that at least one LED 26 of each of the N different color types are respectively provided in practically all grid tracks 34. By way of example, grid tracks 34 extending along the edge or comprising only a few grid holding areas on account of geometric restrictions are excluded therefrom.

(31) The line system 30 comprises main conductor tracks 38 extending along the trajectory 36 of the grid tracks 34, said main conductor tracks being without overlap both among themselves and with the grid tracks 34. Once again, only selected main conductor tracks 38 are provided with reference signs for reasons of a better overview.

(32) The main conductor tracks 38 extend without crossing among themselves.

(33) For electrical power supply purposes, each of the LEDs 26 is electrically connected by means of two connection tracks 40 to the main conductor track 38 that has been assigned in respect of the color type, in a direction transverse to the trajectory 36.

(34) The connection tracks 40 in turn are respectively electrically connected to a contact section 42 of the associated LED 26. Here, the contact sections 42 extend substantially along the trajectory 36.

(35) What emerges herefrom is that each of the crossing regions 32 is formed by a connection track 40 and a main conductor track 38, which are assigned to different color types in each case. Here, the main conductor track 38 forming the crossing region 32 is always arranged adjacently to a main conductor track 38 to which the connection track 40 forming the crossing region 32 is electrically connected.

(36) In respect of the distances of the grid tracks 34 in a direction transverse to the trajectory 36, no more than N main conductor tracks 38 lie between two adjacent grid tracks 34, with the main conductor tracks 38 each having been assigned to different color types.

(37) By way of example, this is the case in the embodiments according to FIGS. 3 and 4, in which three and four main conductor tracks 38, respectively, extend between adjacent grid tracks 34.

(38) Alternatively, the line system 30 may comprise main conductor tracks 38, where no more than 0.5×N main conductor tracks 38 are present between adjacent grid tracks. Here, 0.5×N is rounded up to the next-highest integer. The main conductor tracks 38, which are adjacent on both sides in a direction transverse to the fictitious trajectory 36 of a grid track 34, are each assigned to different color types.

(39) This can be seen in the exemplary embodiment according to FIG. 5. There, provision is made of N=4 different color types, with, however, only two main conductor tracks 38 being present between adjacent grid tracks 34.

(40) In respect of the distance between grid holding areas adjacent along the trajectory 36, i.e. the LEDs 26, no more than two connection tracks 40 extend therebetween in all exemplary embodiments, with the connection tracks 40 in each case being assigned to those color types that correspond to the adjacent LEDs 26 along the trajectory 36.

(41) As is identifiable on the basis of FIG. 2 in particular, an envelope of the multiplicity of LEDs 26 forms a closed polygonal chain, which is a hexagon in the present case. Alternatively, this could also relate to a circle or an oval.

(42) Accordingly, the optical unit 20 has a light entry opening 22a that is likewise hexagonal, i.e., that corresponds to the envelope in respect of its form. In respect of its size, too, the light entry opening 22a and the envelope correspond to one another.

(43) The optical unit 20—e.g., the collimation reflector 22—further has a light emergence opening 22b, which is connected to the light entry opening 22a by way of an, e.g., tubular light-guiding section 22c. The inner side of the light-guiding section 22c is reflective. Moreover, the light emergence opening 22b covers a larger area than the light entry opening 22a. Thus, the optical unit 20 widens in the light emission direction.

(44) Overall, the optical unit 20—e.g., the collimation reflector—consequently spans the totality of the LEDs 26 and is embodied to receive and output the light emanating from each of the LEDs 26.

(45) In order to protect the light-producing assembly 12 and, in particular, the LED arrangement 18 from unwanted influences of the surroundings, i.e., for example, protect it against particles, liquids and/or gases penetrating therein, provision can be made of a protective apparatus 44.

(46) According to the variant of FIG. 7a), the protective apparatus 44 can be a protective glass positioned on the light emergence side of the optical unit 20. Alternatively, a lens or diffuser can be provided at the same location (see FIG. 7b)).

(47) It is also possible to provide a lens that acts as a protective apparatus 44 at the light entry side of the optical unit 20, as illustrated in FIG. 7c).

(48) FIG. 7d) shows a variant in which the protective apparatus 44 comprises two lenses. Here, a converging lens is arranged on the light entry side of the optical unit 20 and an achromatic converging lens is arranged on the light emergence side.

(49) According to one embodiment, the optical unit 20 is embodied as a conical or polygonal reflector, e.g., as a reflector with a hexagonal cross-sectional area, and the protective apparatus 44 acting as a diffuser, e.g., as a stochastic or holographic diffuser, is provided on the light emergence side of the optical unit 20. By way of example, the reflector can be either round or ellipsoid, or polygonal on its light entry and/or outer side. The light entry and emergence sides may have different diameters (perimeters), and so a reflector in the form of a truncated cone or a truncated pyramid may arise, for example.