Converter wheel with continuously adjustable balancing

Abstract

Converter wheel assembly comprising a motor, a disc-shaped carrier (2) with a front (11) and a rear (12), at least one converter unit (5) which is arranged on and connected to the front of the carrier (2), wherein the carrier (2) and converter unit (5) form the converter wheel (1) which is connected to the motor via the hub (13), and at least one annular eccentric disc (6) with an opening (17) for fixing the eccentric disc (6) on the hub (13), wherein an imbalance of the converter wheel assembly is compensated by the fact that the area of ​​the opening (17) in which the eccentric disc (6) is fixed on the hub (13)is spaced apart from the center of mass (18) of the eccentric disc (6) and wherein the support (2) and the eccentric disc (6) are fixed on the hub (13) by a flange (3) or the hub (13) is designed as an expanding hub (20) and the support (2) and eccentric disc (6) are fixed on the expanding hub (20) by an expanding means.

Description

[0001] In general, the invention relates to a rotating converter wheel with converters, particularly suitable for use in projectors. More specifically, the invention relates to a balanced converter wheel. Field of the invention

[0002] Converter color wheels are used in a variety of optical devices, for example in projectors or image-generating devices where images are created using micromirror arrays (e.g. DLP® chips) or LCD chips. The converter wheel usually consists of a disk-shaped carrier which is arranged to rotate and connected to a corresponding electric motor. The carrier therefore acts as a rotor. An optically active component is arranged on the carrier. The optically active component can be converter materials. The converter materials convert the incident excitation light into emission light with a characteristic wavelength or wavelength distribution. When several different converter materials are used in a converter wheel, the color impression perceived by the viewer depends on which converter material emits light.Corresponding color wheels are also called converter wheels or “phosphor wheels”.

[0003] During operation, the converter wheel rotates at a high frequency, for example, 120 Hz. Due to the high rotational frequencies, the converter color wheels must exhibit the greatest possible rotational symmetry with regard to their mass distribution, i.e., they must be balanced to avoid imbalances. Imbalances can lead to unwanted vibrations and thus to material stresses, which adversely affect the service life of the converter color wheels.

[0004] Depending on the projector technology, the converter materials are only applied to certain areas of the substrate, thus creating an imbalance in the converter wheel. This is particularly the case with 1-DLP® chip technology, where the required color channels are generated sequentially. With 3-DLP® or 3-LCD chip technology, the color channels are spatially superposed, and the converter materials form a closed ring on the ring. In this case, too, manufacturing tolerances, for example, due to density fluctuations in the converter material or the amount of adhesion promoter used to fix the converter to the substrate, typically lead to an imbalance that must be compensated for.

[0005] The imbalance of a converter wheel is caused on the one hand by manufacturing tolerances, but can also be caused by an asymmetrical design.

[0006] There are various possibilities known from the state of the art to compensate for this imbalance and thus balance the converter wheel.

[0007] One possibility, described, for example, in US Pat. No. 9,733,469 B2, is to provide a clamping ring for securing the carrier, which clamping ring has devices in the form of blind bores for receiving a balancing mass. Some of these blind bores are filled with a suitable material, such as a polymer or resin. This changes the mass distribution of the converter wheel. Depending on the amount of mass increase generated by the filling and the position of the correspondingly filled recesses, the imbalance generated by the converter can be compensated for, and the converter wheel can thus be balanced. A disadvantage of this, however, is the relatively complex process for filling the recesses.

[0008] Another possibility for aligning the center of mass of the converter wheel with the axis of rotation and thus balancing the converter wheel is described in WO 2019 / 000329 A1. Here, the imbalance is compensated by applying a counterweight with a predefined mass to the carrier. The counterweight can be arranged so that the center of mass of the carrier (without converter) is opposite the converter (relative to the center of rotation). Applying the converter shifts the center of mass in the direction of the axis of rotation and thus balances the converter wheel. However, this also increases the total mass of the converter wheel. A further disadvantage is that, for example, weight fluctuations of the converter cannot be taken into account or can only be taken into account poorly.This allows only a rough adjustment, while process-related mass fluctuations of the converter, for example, are not taken into account. This can have a detrimental effect on the balance.

[0009] CN 2 786 658 Y describes the balancing of a color wheel using movable counterweights. The counterweights are attached to the back of the carrier wheel in recesses. By fixing them using elongated holes, fine adjustment can be achieved by varying the position in the x or y direction. Free rotation of the counterweights on the carrier surface is not possible due to their positioning within the recesses. Furthermore, the color wheels described in CN 2 786 658 Y are not converter wheels; rather, the color impression is created by color filters arranged in segments in the outer area of ​​the carrier disk. Accordingly, the mass difference between the individual segments and the resulting imbalance is smaller than with converter wheels, so the balancing solution described in CN 2 786 658 Y is suitable for fine adjustment. Object of the invention

[0010] It is therefore an object of the invention to provide a balanced converter wheel or a converter wheel assembly with a motor that does not have the above-described disadvantages of known converter wheels. Further objects include providing a converter wheel in which the imbalance caused by manufacturing tolerances is compensated, and providing a method for compensating the imbalance of a converter wheel assembly caused by design and / or manufacturing tolerances. Furthermore, it is an object to compensate for the intrinsic imbalance in color wheels with an asymmetrical design. Description of the invention

[0011] The object of the invention is already achieved by the subject matter of the independent claim. Advantageous embodiments and further developments of the invention are the subject matter of the dependent claims.

[0012] The invention relates to a converter wheel assembly comprising at least one disc-shaped carrier with a front side and a rear side, as well as with a thickness d and a radius r, which is arranged rotatably about a central axis, and at least one converter unit. The converter unit comprises at least one converter material and is applied to the front side of the carrier.

[0013] For the purposes of the invention, a converter material or conversion material is understood to be a material that at least partially converts incoming light of a suitable excitation wavelength into light with a wavelength different from the excitation wavelength, wherein the converted light preferably has a longer wavelength than the excitation light. The converter unit is formed by at least one conversion material.

[0014] The converter wheel assembly also includes a motor for driving the converter wheel and a hub. The converter wheel is fixed to the hub so that it can rotate around the central axis.

[0015] In the converter wheel arrangement according to the invention, an imbalance of the converter wheel arrangement is compensated by at least one eccentric disc. An eccentric disc is understood here to be a disc with an opening for fixing the disc to the hub, wherein the opening has an eccentric position on the disc or enables eccentric positioning and fixing of the eccentric disc on the converter wheel. According to one embodiment, the opening can allow not only a rotational degree of freedom, but also a translational degree of freedom in order to determine the center of mass of the eccentric disc. The position of the opening generally determines the center of rotation of the eccentric disc. An imbalance of the converter wheel arrangement can then be compensated by spacing the center of rotation of the eccentric disc from its center of mass.

[0016] Depending on the specific embodiment of the invention, the eccentric disc can be used to perform both coarse and fine adjustments of the unbalance of the converter wheel assembly. For the purposes of the invention, fine adjustment is understood to mean, in particular, compensation for an unbalance of up to 2000 mg*mm. Adjustments that achieve larger compensations, i.e., more than 2000 mg*mm, are referred to as coarse adjustments.

[0017] According to one embodiment, the eccentric disc has a circular basic shape, with the opening spaced from the center of the circle. An alternative embodiment provides that the eccentric disc has a maximum diameter d längs in the longitudinal direction and a maximum diameter d quer orthogonal to the maximum diameter d längs and the maximum diameter d längs larger than the maximum diameter d querCorresponding eccentric discs can, in particular, have an oval, preferably oval, basic shape. Eccentric discs with egg-shaped or club-shaped basic shapes are also possible. Preferably, the opening and / or center of mass of the eccentric disc lie on an axis which defines the maximum diameter d längs has.

[0018] A further development of the invention provides that the opening is designed as an elongated hole. This enables flexible positioning of the eccentric disc on the hub due to the translational degree of freedom created by the elongated hole. The center of rotation and thus the distance between the center of rotation and the center of mass can be varied via the respective fixing position of the eccentric disc within the elongated hole. This can be used in particular for fine adjustment of the balancing of the converter wheel. For example, a rough adjustment of the converter wheel can be carried out beforehand using methods known from the prior art, for example by attaching counterweights to the carrier. After this rough adjustment, according to one embodiment, the converter unit is attached to the carrier. The eccentric disc is then attached.The positioning of the eccentric disc on the hub within the elongated hole takes into account the actual weight increase resulting from the application of the converter unit and, if applicable, a bonding agent, as well as the influence of the exact position of the converter unit on the center of mass of the converter wheel. The positioning can therefore be understood as a fine adjustment of the center of mass of the converter wheel to balance it. In particular, imbalances of less than 2000 mg*mm, less than 1500 mg*mm, or even less than 800 mg*mm can be precisely compensated. This is particularly advantageous because it allows even small fluctuations in the manufacturing process, such as deviations in the weight and position of the converter unit or the amount of bonding agent used, to be individually compensated.According to an alternative, the converter wheel and / or the eccentric disc are fixed to the hub by a flange or clamping ring.

[0019] The flange can have either a symmetrical or asymmetrical shape. Flanges with an asymmetrical, i.e., eccentric shape, can therefore also be used for coarse adjustment of the imbalance. Alternatively, the eccentric disc can be part of the flange or form the flange itself.

[0020] Alternatively, the hub can be designed as a spreader shaft. In this embodiment, the carrier and eccentric disc are fixed to the hub by a spreading means, such as a pin or a screw.

[0021] According to one embodiment, the eccentric disc is arranged on the rear side of the carrier. This is particularly advantageous because the eccentric disc can be arranged independently of the position of the converter unit. Furthermore, the shape and / or size of the eccentric disc are not limited by the converter unit.

[0022] An advantageous development of the invention provides that the converter wheel arrangement has more than one, i.e., at least two, particularly preferably two eccentric discs. These can be arranged either on the same or on different sides of the carrier.

[0023] According to one embodiment, both eccentric discs are fixed to the hub. This can be achieved using a flange. Alternatively, the two eccentric discs form the flange and thus fix the carrier or converter wheel. In both embodiments, the two eccentric discs are at a fixed angle to each other. This allows for further fine-tuning of the imbalance by adjusting the angle α between the center axes of the two eccentric discs. Thus, by adjusting the angle accordingly, imbalances of up to 2000 mg*mm, preferably up to 1500 mg*mm, and particularly preferably up to 800 mg*mm can be compensated.

[0024] An alternative embodiment provides that the converter wheel device has a first and a second eccentric disc, wherein the first eccentric disc is fixed to the hub and rotates accordingly with the carrier wheel. The second eccentric disc is rotatably mounted on the first eccentric disc and rotates about its own axis. Thus, in this embodiment of the invention, there is no fixed angle between the two eccentric discs.

[0025] The converter unit is preferably designed for operation in remission. Thus, the excitation light strikes the first side of the converter wheel. Lasers have proven particularly advantageous as a light source for the excitation light.

[0026] According to one embodiment, the converter unit and the carrier are bonded together via an adhesive. This allows the converter unit to be glued to the surface of the carrier.

[0027] Ceramic converter materials, phosphor in glass (PIS), phosphor in ceramic (PIC), or phosphor in silicon (PIS), have proven suitable converter materials. Preferably, ceramic converters are used as components of the converter units. According to a preferred embodiment, the converter wheel according to the invention comprises only one converter material, which is preferably applied to the carrier in the form of a monolithic ring. According to another embodiment, the converter unit contains at least two or even at least three different converter materials for generating light with different color coordinates. In these embodiments, several ring segments made of different converter materials are preferably applied to the carrier.

[0028] Another embodiment provides for the converter unit to have a partially circular or circular ring-segment shape with an arc angle α. According to one embodiment, the angle α is in the range of 90 to 320°. According to a variant, the converter unit therefore has a C-shaped basic shape.

[0029] According to a further development of the invention, the carrier comprises at least spatially separated converter units with a partially annular or partially circular shape and a circular angle α. The corresponding color wheels exhibit at least two color changes per revolution during operation. The converter units are preferably arranged opposite one another with respect to the center of the carrier. This arrangement allows the weights of the converter units to at least partially balance each other, thus leading to at least a rough balancing of the converter wheel. Fine adjustment can be achieved using one or more eccentric discs.

[0030] The method according to the invention for balancing a converter wheel with a disc-shaped carrier and at least one converter unit comprises at least the following steps: a) Providing the converter wheel (1), b) Calculation of the unbalance of the converter wheel (1), c) providing at least one eccentric disc (6) with an opening (17) for fixing the eccentric disc (6) on the hub (13), wherein the opening (17) is spaced from the center of mass (18) of the eccentric disc (6), wherein the weight and position of the opening (17) are selected such that the imbalance of the converter wheel (1) calculated in step b) is compensated and d) Fixing the eccentric disc (6) provided in step c).

[0031] In step b), the average unbalance of the converter wheel is calculated based on the average weight of the converter unit and any means used to fix the converter unit, for example a bonding agent. Based on the value calculated in step b), at least one eccentric disc is then selected in step c), the weight of which can compensate for the unbalance calculated in step b). In step d), the position of the eccentric disc or its orientation on the carrier disc is determined, and the eccentric disc is fixed to the hub. Due to process-related fluctuations during the manufacture of the converter wheel or its components, the actual unbalance of the converter wheel may deviate from the unbalance calculated in step b). According to one embodiment of the invention, the converter wheel therefore still has a slight unbalance after step d).This embodiment of the method may involve a rough adjustment of the unbalance.

[0032] According to one embodiment, several eccentric discs are provided in step c) and fixed in step d). Thus, for example, the required weight of the eccentrics calculated in step b) can be fixed by several individual eccentric discs, which are arranged at least partially one above the other in step d).

[0033] A further development of the invention provides that the unbalance of the converter wheel is determined in a step e) following step c). Unlike in step b), in step e) the unbalance of the individual converter wheel is measured. Process-related weight fluctuations of the individual components of the converter wheel are thus recorded and taken into account in a step following step e) when compensating for the unbalance. These additional method steps can be understood as fine-tuning the unbalance. According to one embodiment, the compensation of the unbalance determined in step e) takes place in step d).

[0034] One embodiment of this refinement provides that in step c), two eccentric discs are provided, which are arranged only partially congruent. Thus, an angle a is formed by the two center axes of the eccentric discs. This angle a is adjusted in a step following step e) so that the imbalance determined in step e) is compensated. Preferably, the angle a is adjusted in step d). Preferably, by adjusting the angle a, even very small imbalances of a maximum of 2000 mg*mm, preferably a maximum of 1500 mg*mm, and particularly preferably a maximum of 800 mg*mm can be compensated. This embodiment is therefore particularly well suited for fine adjustment.

[0035] Alternatively, in step c), an eccentric disc with a slotted hole is provided. After determining the imbalance in step e), the imbalance is compensated by adjusting the fixation point on the hub within the slotted hole. Description of the characters

[0036] The invention is described in more detail below with reference to Fig. 1 to 12. They show: Fig. 1 and Fig. 2 color wheels known from the state of the art, Fig. 3 a schematic representation of an eccentric disc, Fig. 4 a schematic representation of a converter wheel with an annular converter unit with the Fig. 3 shown eccentric disc as a first embodiment in plan view, Fig. 5 a schematic representation in plan view of a second embodiment with two eccentric discs and a symmetrical flange, Fig. 6 a schematic representation of an eccentric disc with a slot, Fig. 7 is a schematic representation of a third embodiment with the Fig. 6 eccentric discs shown, Fig. 8 and Fig. 9 shows a schematic representation of a fourth embodiment in plan view, Fig. 10 a schematic cross section through a fifth embodiment with a spreading axis for fixing the converter wheel and Fig. 11 and Fig. 12 the schematic representation of a sixth embodiment in plan view, in which the flange is formed by two eccentric discs.

[0037] In Fig. 1 schematically shows a top view of a converter wheel known from the prior art. The viewing direction corresponds to the direction of the incoming excitation light. The converter wheel comprises a circular carrier 2 with a converter unit 5, also referred to below as the converter, and a flange or clamping ring 3. The axis of rotation 13 of the converter wheel is located at the center of the circle on the carrier or on the hub (not shown). The converter unit 5 is arranged on the carrier 2 and is partially circular, in particular ring-segment-shaped, with a circular opening angle α. The counterweight 9, which is also arranged on the carrier 2, partially compensates for the imbalance induced by the converter unit 5. The position and mass of the counterweight 9 are selected such that the displacement of the center of mass from the axis of rotation 13 caused by the converter unit 5 is compensated.Thus, thanks to the counterweight 9, the center of mass of the converter wheel is on the rotational axis 13. However, this also increases the total mass of the converter wheel. Another disadvantage of the design shown in . Fig. The disadvantage of the converter wheel shown in Figure 1 is that the counterweight 9 only allows for a rough adjustment of the center of gravity. Minor deviations, for example, due to production-related fluctuations in the weight of the converter unit 5 or the amount of adhesion promoter used to fix the converter unit 5 to the carrier 2, are not taken into account. Fine adjustment is therefore impossible or difficult.

[0038] Fig. Figure 2 shows a schematic representation of another converter wheel known from the prior art. Here, in addition to the Fig. 1, a fine adjustment of the center of mass is additionally required by removing mass from the clamping ring 3. The clamping ring 3 serves to fix the carrier 2 to the hub (not shown) and has recesses 7, 8. The recesses 8 are partially filled with a resin and serve to balance the converter wheel. The filled recesses 8 compensate for the imbalance caused by the weight of the converter unit, so that the center of mass of the converter wheel at least largely coincides with its axis of rotation 13. Filling the recesses 8 takes place after the converter 5 has been applied and is relatively complex; moreover, the overall weight of the converter wheel is increased. Furthermore, the carrier has a window 4 which has a high transmission, particularly for light of the excitation wavelength.

[0039] In Fig. Figure 3 shows a schematic plan view of an embodiment of an eccentric disc 6. This has an oval basic shape with a central axis 14, a center of mass 18 and an opening 17. The central axis 18 simultaneously represents the maximum diameter of the eccentric disc d längs The center of mass 18 and the opening 17 are both located on the center axis 14, but are spaced apart from each other. The unbalance generated by the eccentric disc 6 can be adjusted via the mass of the eccentric disc and the distance between the opening 17 and the center of mass 18. This can preferably be done by calculating the average unbalance of the converter wheel (without the eccentric disc) and selecting the weight and position of the borehole (and thus the distance from the center of mass to the center of rotation of the eccentric disc) accordingly.

[0040] Fig. 4 shows a schematic plan view of a first embodiment with the Fig. 3 shown eccentric disc 6. The Fig. The converter wheel 1 shown in Figure 4, without the eccentric disc 6, has an intrinsic imbalance due to the partially annular structure of the converter unit 5 and the window 4. The eccentric disc 6 is fixed via the opening 19 on the hub 13 by means of the flange 3. The opening 19 is designed as an elongated hole. Thus, a variable fixation of the eccentric disc 6 by the flange 3 over the entire length of the elongated hole 19 is possible. In this case, the eccentric disc 6 is aligned on the carrier 2 such that the imbalance caused by the eccentric disc 6 compensates for the intrinsic imbalance of the converter wheel. A further fine adjustment, which, however, is Fig. 4 is not shown, is possible, for example, by selecting an eccentric disc 6 with an unbalance from a set of eccentric discs 6 with different unbalances which is as similar as possible in size to the unbalance of the converter wheel.

[0041] Fig. Figure 5 shows a schematic plan view of another embodiment of the invention, in which the converter wheel 1 has two eccentric discs 60, 61. In this example, the two eccentric discs 60 and 61 are both arranged on the front side 11 of the carrier and each have an elongated hole 19. The flange 3 fixes the eccentric discs 60, 61 rotatably on the hub 13. The adjustment in this example is analogous to that in Fig. 4 by the position of the flange within the elongated holes 19 on the eccentric discs 60, 61 as well as the weight of the eccentric discs 60, 61. After mounting the two eccentric discs 60, 61 on the converter wheel 1, a fine adjustment can also be made by adjusting the angle α 10 between the two eccentric discs 60, 61. The angle α 10 is the angle between the two center axes 14, 15 of the two eccentric discs 60, 61. The angle α 10 can thus be used to adjust the mass distribution of the counterweight applied by the eccentric discs 60, 61. The distances between the center of mass and the center of rotation of the respective eccentric disc 60, 61 are Fig. 5 is determined by the position of the flange 3 within the two slots 19 of the eccentric discs 60, 61. Thus, in the embodiment shown in Fig. In the embodiment shown in Figure 5, both an initial adjustment and a further fine adjustment of the converter wheel can be performed by adjusting the angle α. This allows individual differences in the imbalance of the converter wheels, for example, due to fluctuations in the weight of the converter units and / or the amount of adhesion promoter used, to be particularly well taken into account.

[0042] A further embodiment, which enables continuous balancing, is shown schematically in the Fig. 6 and Fig. 7. In Fig. 6 shows an oval eccentric disc 62 whose borehole is formed as an elongated hole 19. The orientation of the elongated hole 19 coincides with the center axis 18. Fig. 7 shows a schematic representation of a converter wheel 1 in plan view with the Fig. 6 shown eccentric disc 62. To fix the eccentric disc 62 on the hub, it is guided through the slot 19 of the eccentric disc 62 and rotatably fixed by the flange 3. Here, the distance of the center of mass of the eccentric disc 62 from its center of rotation or the hub 3 can be continuously varied through the slot 19 and thus adapted to the respective imbalance of the converter wheel 1. Thus, the Fig. The embodiment shown in Figure 7 also allows fine adjustment after mounting the eccentric disc 62.

[0043] The Fig. 8 and Fig. 9 shows the schematic representation of another embodiment. Fig. 8 is a perspective view of the front side 11 of the converter wheel 1, in Fig. 9 schematically shows the rear side 12 of the same converter wheel 100. The converter wheel 1 has an annular converter unit 5 on the first side 11 of the carrier 2. The eccentric disc 62 has an elongated hole 18 and is arranged on the rear side 12 of the carrier 2. In this embodiment, the converter unit 5 and the eccentric disc 62 are not arranged on the same side of the carrier 2.

[0044] Fig. 10 shows a cross section through a further embodiment of a converter wheel 1, in which the carrier 2 and the two eccentric discs 63, 64 are fixed on a spreading axis 20 by means of a pin 21.

[0045] In the Fig. 11 and Fig. 12, a further embodiment is shown schematically. Fig. 11 is a perspective view of the front of the converter wheel 1, in Fig.12, the rear side 12 of the same converter wheel 1 is shown schematically. The converter wheel 1 has an annular converter unit 5 and a club-shaped eccentric disc 65 on the front side 11 of the carrier 2. A second eccentric disc 66 is arranged on the rear side 12 of the carrier 2. In this embodiment, the eccentric discs 65, 66 simultaneously form the flange and thus fix the carrier 2 to the hub 13. Rough balancing is achieved here via the weight of the eccentric discs 65, 66 and the position of the borehole (not shown) on the center axis 14 or 15 of the eccentric discs 65, 66. Fine adjustment can be achieved via the angle α between the two center axes 14, 15 of the two eccentric discs 65, 66. List of reference symbols 1, 100, 101 converter wheel 2 carriers 3 clamping ring 4 windows 5 Converter unit 6.60–66 eccentric ring 7 unfilled hole 8 Hole with leveling compound 9 Counterweight 10 angle α 11 Front 12 Back 13 Hub 14, 15 central axis 16 Rotation axis 17 Opening 18 Center of mass 19 slot 20 Spreading axis 21 pen 22 Deepening

Claims

[1] Converter wheel arrangement comprising a motor, a disc-shaped carrier (2) with a front side (11) and a rear side (12), at least one converter unit (5) which is arranged on the front side of the carrier (2) and connected thereto, wherein the carrier (2) and converter unit (5) form the converter wheel (1), which is connected to the motor via the hub (13), and at least one annular eccentric disc (6) with an opening (17) for fixing the eccentric disc (6) on the hub (13), wherein an imbalance of the converter wheel arrangement is compensated in that the area of ​​the opening (17) in which the eccentric disc (6) is fixed on the hub (13),is spaced from the center of mass (18) of the eccentric disc (6) and wherein the carrier (2) and the eccentric disc (6) are fixed to the hub (13) by a flange (3) or the hub (13) is designed as an expanding hub (20) and the carrier (2) and the eccentric disc (6) are fixed to the expanding hub (20) by means of an expanding means. [2] Converter wheel arrangement according to the preceding claim, wherein the eccentric disc (6) has a maximum diameter d längs in the longitudinal direction and a maximum diameter d quer orthogonal to the maximum diameter d längs and the maximum diameter d längs larger than the maximum diameter d quer is. [3] Converter wheel arrangement according to the preceding claim, wherein the eccentric disc (6) has an ovaloid, preferably an oval basic shape or a club-shaped basic shape. [4] Converter wheel arrangement according to one of claims 2 or 3, wherein the opening (17) and / or the center of mass (18) of the eccentric disc (6) lie on an axis (14) which has the maximum diameter d längs has. [5] Converter wheel arrangement according to one of the preceding claims, wherein the opening (17) is designed as an elongated hole (19). [6] Converter wheel arrangement according to one of the preceding claims, wherein the eccentric disc (6) is mounted on the rear side (12) of the carrier (2). [7] Converter wheel arrangement according to one of the preceding claims, wherein the converter wheel (1) and eccentric disc (6) are fixed to the hub (13) by an asymmetric flange (3). [8] Converter wheel arrangement according to one of the preceding claims, wherein the hub (13) is designed as an expanding axis (20) and the expanding means comprises a pin (21) or a screw. [9] Converter wheel arrangement according to one of the preceding claims, wherein the converter wheel arrangement has at least two, preferably two eccentric discs (60, 61). [10] Converter wheel arrangement according to the preceding claim, wherein by adjusting the angle α (10) between the center axes (14, 15) of the eccentric discs (60, 61) an imbalance of a maximum of 2000 mg*mm, preferably of a maximum of 1500 mg*mm and particularly preferably of a maximum of 800 mg*mm is compensated. [11] Converter wheel arrangement according to claim 9 or 10, wherein one of the eccentric discs (65, 66) is arranged on the front side (11) and the other eccentric disc (66) is arranged on the rear side (12) of the carrier (2). [12] Converter wheel arrangement according to one of the preceding claims, wherein the converter unit (5) is designed for operation in remission. [13] Converter wheel arrangement according to one of the preceding claims, wherein the converter unit (5) is arranged in the periphery of the carrier (2). [14] Converter wheel arrangement according to one of the preceding claims, wherein the converter unit (5) and the carrier (2) are connected to one another on the front side of the carrier (2) by an adhesive and the converter unit (5) is preferably glued to the front side of the carrier (2). [15] Converter wheel arrangement according to the preceding claim, wherein the converter unit (5) comprises at least one converter material selected from ceramic converter materials, phosphorus in glass (PIS), phosphorus in ceramic (PIC), or phosphorus in silicon (PIS), preferably at least one ceramic converter material. [16] Converter arrangement according to the preceding claim, wherein the converter unit (5) comprises at least two, particularly preferably three different ceramic conversion materials for generating light with different color locations. [17] Converter wheel arrangement according to one of the preceding claims, wherein the converter wheel arrangement comprises further devices for compensating the imbalance, preferably in the form of counterweights on the carrier (2) or filled bores on the carrier (2), in the form of counterweights or filled bores on the flange (3) and / or by material removal on the flange (3) and / or the carrier (2). [18] Converter wheel arrangement according to one of the preceding claims, wherein the converter unit (5) is designed in the shape of a circular ring segment, preferably as a monolithic circular ring segment. [19] Converter wheel arrangement according to one of the preceding claims, wherein the eccentric disc (6) is made of metal, preferably of aluminum. [20] Method for balancing a converter wheel (1) comprising at least one disc-shaped carrier (2) and a converter unit (5), wherein the converter wheel (1) is connected to a motor via a hub (13), comprising at least the following steps: a) Providing the converter wheel (1), b) Calculation of the unbalance of the converter wheel (1), c) providing at least one eccentric disc (6) with an opening (17) for fixing the eccentric disc (6) on the hub (13), wherein the area of ​​the opening (17) in which the eccentric disc (6) is fixed is spaced from the center of mass (18) of the eccentric disc (6), wherein the weight and position of the opening (17) are selected such that the imbalance of the converter wheel (1) calculated in step b) is compensated and d) fixing the eccentric disc (6) provided in step c) by means of a flange (3) on the hub (13) or by means of an expanding means, wherein the hub (13) is designed as an expanding hub (20). [21] Method according to the preceding claim, wherein in step c) several, preferably two eccentric discs (60, 61) are provided. [22] Method according to one of the two preceding claims, wherein in a step e) the unbalance of the converter wheel (1) is determined and in a step following step e) a compensation of the unbalance determined in step e) takes place. [23] Method according to claim 22, wherein step e) precedes step d) and the compensation of the imbalance determined in step e) takes place in step d). [24] Method according to claim 22, wherein in step c) at least two eccentric discs (60, 61) are provided and in step d) the imbalance determined in step e) is compensated by adjusting the angle α (10) between the central axes (14, 15) of the eccentric discs (60, 61). [25] Method according to claim 24, wherein by adjusting the angle α (10) an imbalance of a maximum of 2000 mg*mm, preferably of a maximum of 1500 mg*mm and particularly preferably of a maximum of 800 mg*mm is compensated. [26] Method according to claim 21, wherein in step c) an eccentric disc (6) with an elongated hole (19) is provided as an opening (17) and wherein the position of the fixation on the hub (13) is adjusted so that the imbalance determined in step e) is compensated.

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