Kinematic module for a head-up display, head-up display, and motor vehicle

Abstract

The invention relates to a kinematic module (20) for a head-up display (1), in particular for a motor vehicle (2), as well as a head-up display and a motor vehicle (2) which are more resistant to vibrations. The kinematic module (20) comprises: - a support device (3) and a frame device (4) for attaching a reflection device of the head-up display (1), - at least one pivot joint (5) by means of which the support device (3) and the frame device (4) are pivotably coupled to each other about a pivot axis (X), and - at least one mechanical stop device (6) which is configured to limit a deformation of the pivot joint (5) resulting from an external force.

Description

The invention relates to a kinematic module for a head-up display, a head-up display, in particular for a motor vehicle, and a motor vehicle having a head-up display.A head-up display, referred to for short as HUD, or also as a "head-up display", is already known from the prior art, in particular in motor vehicles, and also in aircraft or watercraft. An HUD enables a user to maintain his viewing direction to an external environment of the motor vehicle and thus his head posture by projecting display elements, for example information for the user, into his field of view. Preferably, a light source, also referred to as a picture generating unit (PGU), for example a TFT display, which can be installed in an installation space of the motor vehicle, can generate the display elements in the form of light, wherein the light can be reflected via at least one reflection device to a front pane of the motor vehicle, so that an optical illusion can be generated for the user that the display elements are located in the external environment, in particular at a certain distance.The reflection device can be designed to be pivotable by means of a kinematic module, so that the HUD can be adapted to a size or to an eye position of the user, for example, by adapting a pivot position, or can be pivoted into a rest position. For this purpose, the reflection device can be fastened in particular to a frame device which is pivotably connected to a carrier device via a pivot joint. The pivot joint can have a certain elasticity in order to be able to ensure a high functionality and service life. However, such rotary joints may be susceptible to external forces or vibrations, for example caused by the motor vehicle driving over an unfixed terrain. As a result of the external force effect, the rotary joint, in particular a component of the rotary joint, can be overstretched and thus damaged, so that the functionality of the HUD or of the kinematic module can no longer be ensured.The object of the invention is to provide a kinematic module for a head-up display, a head-up display, in particular for a motor vehicle, and a motor vehicle which is more resistant to vibrations.The object is achieved by the subject matters of the independent claims. Advantageous refinements of the invention are described by the dependent patent claims, the following description and the figures.A first aspect of the invention provides a kinematic module for a head-up display (HUD), in particular for a motor vehicle. The kinematic module comprises in particular a carrier device and in particular a frame device for fastening an optical reflection device of the HUD. The kinematic module furthermore comprises in particular at least one pivot joint, by means of which the carrier device and the frame device are coupled to one another such that they can be pivoted about a pivot axis. Furthermore, the kinematic module comprises at least one mechanical stop device which is configured to limit a deformation of the pivot joint resulting from an external force effect, preferably perpendicular to the pivot axis.By limiting the deformation by the mechanical stop device, it can be advantageously ensured that the rotary joint is not damaged due to the external force effect. In particular, the deformation of the rotary joint can advantageously be prevented beyond an elastic deformation, so that a plastic and thus permanent deformation of the rotary joint is prevented. Due to the fact that the pivot joint itself can only deform to such an extent under the action of the external force that it only deforms below the elastic limit, it can be ensured that the joint can elastically deform back again completely into its original shape. As a result, the joint, and thus the kinematic module and the HUD, is significantly more resistant to vibrations, and a service life or maintenance intervals of the kinematic module or of the HUD can be extended considerably. In particular, the rotary joint does not have to be replaced on account of damage caused by the external force effect.An important advantage of this concept is to ensure the functionality of the HUD in the event of possible impacts and to pass the validation of the components of the HUD under temperature and humidity in random vibration and shock tests.The HUD, also referred to as a "head-up display", can be used in particular in motor vehicles, aircraft, watercraft or the like, and can be configured to project display elements onto a display surface, preferably transparent surface, for example a front windshield of the vehicle or an additional glass pane in front of the front windshield, such that the visual occlusion can be generated for the user, for example a driver of the motor vehicle, that the display elements are located in an external environment of the motor vehicle, for example a few meters, in particular approximately 2.4 meters in front of the motor vehicle.The HUD can have, in particular, a housing which can be integrated, for example, into a cockpit or dashboard of the motor vehicle and can be firmly connected to the motor vehicle. For example, the housing can be screwed to fastening points of the motor vehicle. The housing can have in particular in its interior the components of the HUD, in particular the kinematic module, and electronic connections for electronic connection to the motor vehicle.The carrier device, also referred to as support, can in particular be fixedly connected to the housing or be the housing of the HUD itself. For example, the carrier device can be made of plastic, in particular an injection-molded part.The frame device, also referred to as a back frame, can in particular have interfaces for fastening the reflection device. For example, the frame device may have a surface to which the reflection device may be bonded.The optical reflection device of the HUD can have, in particular, a reflective surface which is designed to reflect light from a light source. In particular, the reflection device can be a mirror, preferably a free-form mirror, wherein a free-form playgel can be characterized in that it has a certain curvature of the reflecting surface in all directions. The reflection device can be made of glass in particular, wherein other reflective materials are conceivable. The frame device can be formed in particular within the housing of the HUD.The HUD can have a light source, also as a picture generating unit (PGU), inside the housing, which can generate the display elements as light elements. The light elements can be projected, for example, directly or indirectly via a further reflector onto the reflective surface of the reflection device and reflected onto the display surface.The carrier device is designed in particular to be pivotable with respect to the carrier device, as well as with respect to the housing and the dashboard of the motor vehicle. The pivotable mounting is made possible in particular by the at least one pivot joint, wherein preferably two pivot joints can be provided, which make a pivoting movement about the common pivot axis possible. Pivotably coupled can be understood in particular to mean that the carrier device and the frame device are connected to one another, wherein primarily only one degree of freedom, namely a degree of rotational freedom about the pivot axis, is permitted by the pivot joint or from a combination of the two pivot joints. The pivot joint can be designed, for example, as a ball-head bearing or as a hinge or the like.The rotary joint, which can preferably be designed to be elastic at least in a direction perpendicular to the axis of rotation, enables in particular a frictional or play-free rotatable connection, so that an exact pivot position of the frame device can be adjusted. By means of the pivotable coupling of the carrier device, the latter and thus also the reflection device can be pivoted into at least two, in particular at least three, preferably continuously adjustable pivot positions of the kinematic module and held in this pivot position.A pivot position may correspond in particular to a rest position of the reflection device, in which the HUD is out of operation. In the rest position, for example, the reflection device can be pivoted in such a way that no sunlight is reflected via the reflection device into the interior of the housing. Moreover, the different pivot positions of the kinematic module may allow the HUD to be adjusted for users of different sizes. For example, in the case of a smaller person, the eyes can be deeper, with the result that the pivot position is adapted in accordance with the deeper position of the eyes. The same applies to medium-sized and large persons. For example, a detection device of the motor vehicle can detect the eyes of the user and generate a virtual box whose position can be determined. Depending on the determined box position of the detected eyes, the frame device can then be pivoted into a specific pivot position according to a predefined rule.According to the invention, the kinematic module has at least one, in particular two, mechanical stop devices, preferably one stop device per pivot joint each. The stop device makes it possible to limit a deformation of the pivot joint, in particular perpendicular to the pivot axis. In other words, the stop device leaves the swivel joint deformed up to a defined, maximum deformation (deformation limit) and prevents the deformation of the swivel joint beyond the deformation limit. The deformation limit is preferably to be selected to be less than or equal to the elasticity limit of the pivot joint or of a component of the pivot joint, so that the deformed pivot joint can always be deformed back into its original shape. Preferably, the stop device can have an end stop, beyond which no deformation of the rotary joint can take place any longer.In particular in normal operation or normal state of the motor vehicle, it can be provided that the stop device is not required, since the pivot joint does not deform or only deforms below the deformation limit. In this case, the rotary joint can absorb external forces completely, for example, and automatically dissipate and transmit them by elastic deformation.Preferably, the stop device can be provided only for a shock state or shock moment of the motor vehicle, in which the pivot joint would be deformed beyond the deformation limit, so that it would deform plastically and thus permanently and thus would be damaged. This is prevented by the stop device. For example, in the shock state, the external force is conducted at least beyond a predefined limit into the stop device, which absorbs the external force, for example, without deforming or conducting it on to the housing or to the motor vehicle. Thus, the external force is diverted away from the pivot joint beyond the predetermined limit. The stop device is preferably embodied to be significantly more rigid than the rotary joint, in particular as at least one component of the rotary joint.The predetermined limit of the force may preferably be directly connected to the deformation limit. For example, the swivel joint is deformed as far as the deformation limit in the event of an external force effect at the force limit, wherein the force can be conducted into the stop device via the force limit.The deformation can result in particular from the external force effect. In other words, an external force acts on the rotary joint in such a way that the latter can deform. The external force is applied to the pivot joint, in particular externally to the kinematic module or HUD, in particular via the motor vehicle to the housing and the carrier device to the pivot joint. For example, the external force may be generated in the shock state due to a vibration. The vibration can be generated, for example, by driving on the motor vehicle on an unfixed road, or else by an accident of the motor vehicle. For example, in the event of a vibration, a force of up to 30 G, 40 G, 50 G, 60 G or up to 100 G can act.An exemplary embodiment provides that the kinematic module has a stepping motor which is motion-coupled to the frame device and is designed to pivot the frame device relative to the carrier device. As a result, the frame device can be set precisely and in a controlled manner, and automatically into a specific pivot position. A suspension of the stepper motor can preferably be fixedly connected to the housing. A movable actuator of the stepper motor, for example a carriage on a spindle of the stepper motor, can preferably be coupled to the frame device in such a way that a linear movement of the carriage results in a pivoting movement of the frame device.One exemplary embodiment provides that the at least one rotary joint has a joint head, a joint socket and an elastic element. The joint head can be arranged in particular between the joint socket and the elastic element and can be mounted rotatably about the pivot axis between the joint socket on one side thereof and the elastic element on the opposite other side thereof. The joint socket can in particular be designed trough-like or socket-like, preferably complementary to the joint head. The joint head can preferably be spherical or cylindrical and be formed complementary to the joint socket.Preferably, the elastic element presses the joint head into the joint socket with a force, so that the joint head is rotatably mounted in the joint socket without play.In other words, the joint head is clamped between the joint head and the elastic element, quasi in the form of a rotatable clamping connection. This has at least the advantage that a pivot position can be adjusted exactly and without play. As a result, the display elements can be displayed particularly quietly and sharply for the user.The joint head and the joint socket can preferably be made of plastic or metal. The elastic element is preferably elastic, in particular more elastic, than the socket and the joint head. Preferably, the elastic element is resilient, wherein the elastic element exerts a holding force or a spring force on the joint head in the direction of the joint socket. This holding force should be designed to be lower than the permanent holding force of the stepper motor, taking into account the friction and the temperature influence within the rotary joint over the service life. Accordingly, the elastic element should be manufactured with a high precision or with a low tolerance, so that the desired prestress or holding force can be achieved as accurately as possible. The elastic element can in particular have holding means, by means of which the elastic element can be held, in particular clamped, on the joint socket.The joint head can in particular be firmly connected to the carrier device or the frame device. Correspondingly complementarily, the socket and the elastic element can be firmly connected to the frame device or the carrier device. For example, the joint head can be formed integrally with the carrier device or the frame device, or can be screwed to the latter. For example, the joint socket can be integrally connected to the carrier device or the frame device, or can be screwed to the latter.One exemplary embodiment provides that the at least one mechanical stop device is configured to limit a deformation of the elastic element of the rotary joint resulting from the external force effect. This advantageously prevents the elastic element from plastically deforming. A plastic deformation would result in the elastic element no longer being able to generate that exact prestress on the joint head and thus being considered to be damaged. The deformation of the elastic element can be effected in particular in such a way that the joint head presses against the holding force of the elastic element due to the external force effect. This force, which now acts on the elastic element from the joint head, can be greater than the holding force of the elastic element, so that the elastic element is pressed outwards, i.e. away from the pivot axis, and is thereby deformed. The stop device can be designed accordingly such that the end stop is directed such that a deformation of the elastic element beyond the deformation limit outwards is prevented.An exemplary embodiment provides that the at least one mechanical stop device has a first stop element and a second stop element, which is spaced apart from the first stop element. In normal operation, the two stop elements do not touch one another, i.e. they are not contacting one another. Rather, a gap, in particular an air gap, can be located between the stop elements during normal operation.The first stop element is preferably configured to abut the second stop element depending on the maximum deformation or the deformation limit of the rotary joint, so that the deformation of the rotary joint, in particular of the elastic element, is limited. As a result, the plastic deformation of the rotary joint, in particular of the elastic element, can be prevented. The kinematic module or HUD is thus advantageously more resistant to vibrations. In particular, the stop elements can consist of metal or plastic and be formed stiff and inelastic compared to the joint or the elastic element, so that they do not deform as it were due to the external force effect.In particular, the deformation of the pivot joint or of the elastic element is stopped by the abutment of the first stop element on the second stop element. If the first stop element strikes, the swivel joint in particular has arrived at its deformation limit. By means of the stop of the first stop element, the latter abuts on the second stop element, so that the force can be introduced from the first stop element into the second stop element and the movement is thereby stopped.For example, it can be provided that a movement of the first stop element is coupled to the movement of the joint head due to the external force effect. In other words, the first stop element may move when the joint head moves, preferably in the same direction and by the same distance. The second stop element is decoupled from the movement of the joint head. For example, it can be provided that a movement of the second stop element is coupled to the movement of the joint socket. In other words, the second stop element may move when the socket moves, preferably in the same direction and by the same distance.An embodiment provides that the first stop element is arranged within the second stop element such that it can rotate about the pivot axis relative to the second stop element. This advantageously allows the first stop element or the second stop element to rotate together during a pivoting movement of the frame device about the pivot axis. As a result, the function of the stop element can be ensured in any pivot position. The first stop element can be in particular contactless with the second stop element during normal operation and can thus be rotated smoothly.An embodiment provides that the joint head and the first stop element are firmly connected to the carrier device, for example screwed to the carrier device or formed integrally therewith. A further exemplary embodiment provides that the joint socket and the second stop element are firmly connected to the frame device, for example screwed to the frame device or formed integrally therewith.An embodiment provides that the carrier device has at least one first boom on which the joint head is arranged. A further exemplary embodiment provides that the carrier device has at least one second cantilever arm on which the first stop element is arranged. The two cantilevers can in particular be formed separately from one another. In the case of two rotary joints and two stop devices, a total of four cantilevers can be provided. A pivoting movement can be improved by the cantilevers. The cantilevers can also be referred to as arms which project from a plate-like base body of the carrier device. The cantilevers can furthermore have a certain curvature, which particularly promotes a pivoting movement.One embodiment provides that the first extension arm extends substantially perpendicular to the pivot axis, wherein the joint head protrudes from the first extension arm along the pivot axis. In other words, the articulated head is oriented substantially laterally at right angles to the first boom. A further exemplary embodiment provides that the second cantilever extends substantially perpendicular to the pivot axis, wherein the first stop element protrudes from the second cantilever along the pivot axis. In other words, the first stop element is oriented substantially laterally at right angles to the second extension arm.One exemplary embodiment provides that the joint head and the first stop element are directed opposite to one another in the pivot axis. In other words, the joint head and the first stop element protrude along the pivot axis in opposite directions from the respective boom, wherein these do not face away from one another but rather face one another. Advantageously, a position securing of the joint head along the pivot axis can thus be additionally ensured.One exemplary embodiment provides that the frame device forms the joint socket and the second stop element integrally. For example, the frame device with the joint socket and the second stop element can represent an injection-molded workpiece.An embodiment provides that the joint socket and the second stop element are preferably formed directly adjacent to one another along the pivot axis. As a result, the rotary joint and the stop device can be arranged on one another in a particularly compact manner.An exemplary embodiment provides that the first stop element is designed as a bolt, wherein the bolt has an at least approximately oval profile. In particular, the bolt has an oval profile or approximately a rectangular profile with a narrower and a wider side. In other words, the profile may represent a mixed shape of an oval and a rectangular profile, in which a length of the profile is wider than the width of the profile. The profile can substantially have a profile shape which has a circular basic shape, wherein two circle segments lying opposite one another are separated from the circular basic shape, such that the profile can have at least one narrower side and one wider side. The profile contour can thus consist of a first circular arc, a chord, a second circular arc and a second circular arc, wherein the first and the second chord can be opposite one another and parallel to one another. Overall, the bolt can thus have an elongate profile.One exemplary embodiment provides that the second stop element is designed as a depression. The depression can also be referred to as a trough-shaped depression, in particular in the plate-shaped frame device. The depression can have a round bottom surface, wherein the bolt can be arranged within the depression in a contactless manner with respect to the bottom surface. The round bottom surface can preferably be designed to round the circular arc of the bolt, so that a gap between the bolt and the trough has a constant width independently of a pivot position.The depression preferably has a slot through which the bolt can be guided during assembly of the HUD. As a result, the HUD, in particular the coupling of the carrier device to the frame device, can be accomplished particularly easily and efficiently. In particular, this makes it possible that in one working step or with a movement of the bolts into the depression, and the joint head can be guided into the joint socket. In particular, the bolt and the joint head can be coupled to the joint socket and the trough from the same side.Preferably, the width of the slot can be formed complementary to the narrower side of the bolt, in particular to a width of the bolt from the chord to the other, such that the bolt can be passed through the slot with the narrower side. Even by slightly rotating the bolt, for example, by 1°, 2°, 3°, 4° or 5°, or with the wider side of the bolt, this can in particular not be passed through the slot, since the slot would be too narrow in this case, so that the bolt can be locked or enclosed within the depression.For mounting the bolt in the depression, it can be provided that the frame device must be pivoted into a mounting pivot position, so that the insertion of the bolt can first be made possible. The mounting pivot position can differ in particular from the rest position, as well as from pivot positions in which the frame device is operated. This advantageously ensures that in the idle state and in the operating state the bolt can no longer escape from the depression through the slot. In a shock state, it can thus be provided that the bolt strikes with its circular arc against the base surface of the depression, so that the deformation of the elastic element is limited.In the broadest sense, the stop device can thus be designed in the manner of a bayonet lock, in which the bolt is guided through a slot and locked to the depression by rotation of the bolt.One exemplary embodiment provides that the elastic element is designed as a sheet metal clamp. Sheet metal clamps can be produced with high precision and at low cost. In addition, sheet metal is particularly suitable as an elastic element. The sheet metal clamp can be designed in particular in the form of a strip, wherein retaining clamps can be provided as retaining elements at the distal end thereof, by means of which retaining clamps the sheet metal clamp is held on the joint socket or on the frame device. In a center of the sheet metal clamp, the latter can have a round dent in which the joint head can be mounted with friction and without play. The curvature of the dent can be formed in particular complementary to the joint head.A head-up display, in particular for a motor vehicle, is provided by a further aspect of the invention, wherein the HUD has a kinematic module according to the invention. Further embodiments of the HUD according to the invention follow directly from the various embodiments of the HUD according to the invention and vice versa. In particular, individual features and corresponding explanations and advantages with respect to the various embodiments can be transferred analogously to the kinematic module according to the invention to corresponding embodiments of the HUD according to the invention.A motor vehicle is provided by a further aspect of the invention. The motor vehicle has in particular the head-up display according to the invention. The motor vehicle can be designed, for example, as a passenger car, as a truck, as a bus or as a motorcycle.Further features of the invention are evident from the claims, the figures and the description of the figures. The features and combinations of features mentioned above in the description and the features and combinations of features mentioned below in the description of the figures and / or shown in the figures can be included by the invention not only in the respectively specified combination but also in other combinations. Embodiments and combinations of features may also be included in the invention, which do not have all features of an originally formulated claim. The invention may also include embodiments and combinations of features that go beyond or depart from the combinations of features set forth in the appended claims.The invention is explained in more detail below with reference to specific exemplary embodiments and associated schematic drawings. In the figures, identical or functionally identical elements can be provided with the same reference numerals. The description of identical or functionally identical elements may not necessarily be repeated with respect to different figures. The following are shown: FIG. 1 shows a schematic illustration of an exemplary embodiment of a kinematic module according to the invention; FIG. 2 shows an enlarged illustration of an exemplary embodiment of a rotary joint of the kinematic module according to the invention; FIG. 3 shows an enlarged illustration of a portion of a front view of the kinematic module according to the invention; FIG. 4 shows an enlarged illustration of a portion of a rear view of the kinematic module according to the invention; FIG. 5 shows a schematic sectional illustration of an exemplary embodiment of a kinematic module according to the invention; FIG. 6 shows a schematic illustration of an exemplary embodiment of a motor vehicle according to the invention with a head-up display according to the invention.FIG. 1 shows a schematic illustration from a rear view of an exemplary embodiment of a kinematic module 20 according to the invention, preferably for a head-up display (HUD) 1 (not shown), in particular of a motor vehicle 2 (not shown). For simplified illustration, only the components of the kinematic module 20 that are relevant for the invention are illustrated. The kinematic module 20 can have a carrier device 3, which can be firmly connected, preferably screwed, in particular to a housing 19 (not shown) of the HUD 1. The kinematic module 20 can furthermore have a plate-like frame device 4, to which a reflection device of the HUD 1, in particular in the form of a free-form mirror, can be fastened, in particular adhesively bonded, to a surface of the frame device 4 which is repellent in FIG. 1.According to the exemplary embodiment, the kinematic module 20 can have two rotary joints 5, by means of which the carrier device 3 and the frame device 4 are coupled to one another such that they can be pivoted about a pivot axis X. Furthermore, according to this exemplary embodiment, the kinematic module 20 can have two mechanical stop devices 6, which are each configured to limit a deformation of the associated, adjacent rotary joint 5 resulting from an external force effect. In addition, the carrier device 3 and the frame device 4 can be connected to one another by means of a tension spring 18, so that they are prestressed with respect to one another.The kinematic module 20 can in particular have a stepping motor 15 which can be motion-coupled to the frame device 4, in particular to a further extension arm of the frame device 4, and can be designed to pivot the frame device 4 about the pivot axis X with respect to the carrier device 3. The stepper motor 15 can therefore also tension the tension spring 18 further or tension it can be relaxed at least by one amount.According to the exemplary embodiment, the carrier device 3 can each integrally form a first extension arm 12, to the distal ends of which a joint head 7 of one of the rotary joints 5 can be formed or fastened, in particular screwed, in each case. The frame device 4, on the other hand, can each integrally form a joint socket 8 of one of the rotary joints 5, in particular in the plate-shaped structure of the frame device 4.The preferably spherical or cylindrical joint heads 7 can each be positioned at least partially within the associated joint socket 8. A respective, elastic element 9, preferably a sheet metal clamp 9, of the swivel joint 5 can be clamped to the frame device 4 in such a way that the joint head 7 is mounted so as to be rotatable about the pivot axis X without play or frictionally between the joint socket 8 and the sheet metal clamp 9. In particular, the sheet metal clamp 9 can be prestressed and produce a force which presses the joint head 7 into the joint socket 8. By rotating the joint socket 8 with sheet metal clamp 9 about the joint head 7 about the pivot axis X, the frame device 4 can thus be pivoted about the pivot axis 4 with respect to the carrier device 3 by means of the stepper motor 15.According to the exemplary embodiment, the carrier device 3 can each integrally form a second extension arm 13, at the distal ends of which a first stop element 10 of one of the stop devices 6 can be formed or fastened, in particular screwed, in each case. The frame device 4, on the other hand, can each integrally form a second stop element 11 of one of the stop devices 6, in particular in the plate-shaped structure of the frame device 4. In normal operation of the kinematic module 20 or of the HUD 1 or of the motor vehicle 2, the stop elements 11, 12 can be configured contactless with respect to one another, so that pivoting of the frame device 4 does not cause any friction within the stop device 6.The respective mechanical stop device 6 can be configured in particular to limit a deformation of the sheet metal clamp 9 of the swivel joint 5 resulting from the external force effect, preferably in a direction perpendicular to the swivel axis X. In particular, the deformation can be caused by a movement of the joint head 7 against the sheet metal clamp 9 or the sheet metal clamp 9 against the joint head 7, in particular triggered by the jerk-like external force, for example due to driving on the motor vehicle on an unfixed road. If this deformation is too great or the deformation arrives at a deformation limit, the bolt 10 preferably strikes the depression 11, so that the deformation of the sheet metal clamp 9 beyond the deformation limit is prevented.FIG. 2 shows an enlarged illustration of an exemplary embodiment of one of the rotary joints 5 of the kinematic module 20 according to the invention. The joint socket 8 is here partially transparent and the sheet metal clamp 9 is shown in dashed lines in order to enable the view of the joint head 7, which is mounted between the sheet metal clamp 9 and the joint socket 8 so as to be rotatable about the pivot axis X without play. Furthermore, a section of a housing 19 of the HUD 1 is shown, which can be fixedly connected, for example, on the outside to a dashboard of the motor vehicle 2 and on the inside to the carrier device 3 and the actuating motor 15.FIG. 3 shows an enlarged representation of a portion of a front view of the kinematic module 20 according to the invention, wherein it is shown that the sheet metal clamp 9 has a clamp-like holding means 16 at each of its distal ends in order to clamp the sheet metal clamp 9 to the frame device 4. Furthermore, the bolt 10 can be seen on an enlarged scale, which is mounted within the depression 11.FIG. 4 shows an enlarged illustration of a portion of a rear view of the kinematic module 20 according to the invention. It is shown that the sheet metal clamp 9, in particular centrally, can have a dent 17 which can be formed in a complementary manner to the joint head 7 in order to mount it rotatably without play and correspondingly exert a force on the joint head 7 which is as flat as possible. The depression 11, in particular the wall of the depression 11, can have a slot 14, through which the bolt 10 can be introduced into the depression 11 during assembly and only in an assembly position of the frame device 4. In the event of a slight rotation of the bolt 10 or of the depression 11 about the pivot axis X, for example into the rest position of the HUD 1 or pivot position during operation of the HUD 1, the bolt 10 can, on the other hand, no longer be guided through the slot 14, with the result that, as a result of the external force effect, the bolt 10 strikes against the wall of the depression.In particular, FIGS. 3 and 4 show that the joint head 7 and the bolt 10 are arranged on the rear side of the frame device 4, wherein the reflection device of the HUD 1 can be arranged on the front side of the frame device 4. On the rear side, the depression 11 projects out of the plate-like base body of the frame device 4, whereas the socket 8 is lowered into the plate-like base body of the frame device 4.FIG. 5 shows a schematic sectional illustration of an exemplary embodiment of a kinematic module 20 according to the invention in a Y-Z plane, orthogonally to the pivot axis X, in particular in the mounting position, wherein the bolt 10 is already introduced through the slot 14 into the depression 11. It can be seen that the bolt 10 can be guided through the slot 14 only in the mounting position because of its oval or rectangular or elongate profile. In a position deviating from the mounting position, and under an external force effect, it can be provided that the bolt 10 strikes the depression 11 and limits the deformation of the sheet metal clamp 9.FIG. 6 shows a schematic illustration of an exemplary embodiment of a motor vehicle 2 according to the invention, which has an HUD 1 according to the invention. The HUD 1 can be integrated in particular in a dashboard or cockpit of the motor vehicle 1. The housing 19 of the HUD 1 can have interfaces, for example, which can be firmly connected to corresponding interfaces of the dashboard, so that the frame device 4 is mounted pivotably to the dashboard.Overall, the examples show how an HUD kinematic module 20 with a stop device 6, for example as a bayonet secondary lock, can be provided for securing the pivot axis X and its clamped parts at higher mechanical impact loads. The kinematic module 20 of the HUD 1 may consist of the fixation (frame device 4) of the reflecting device, in particular a free-form mirror, and its trajectory between the storage position and the positions of the upper and lower eyebox of the end user.The pivoting can be realized by a stepping motor 15 which is broken down in the translatory movement to microsteps. The existing concept is based on the fact that the ball (joint head 7) is held on a plastic part (carrier device 3), which can be screwed in particular to the housing 19, between the plastic part (carrier device 3) and a sheet metal clamp 9, which requires a higher precision tolerance in order to achieve the required prestress (holding force). This holding force must be lower than the continuous load capacity of the stepper motor during the lifetime, taking into account the friction and the temperature influence within the system.

Claims

Kinematic module (20) for a head-up display (1), in particular for a motor vehicle (2), having - a carrier device (3) and a frame device (4) for fastening a reflection device of the head-up display (1), - at least one rotary joint (5), by means of which the carrier device (3) and the frame device (4) are coupled to one another such that they can be pivoted about a pivot axis (X), and - at least one mechanical stop device (6) which is configured to limit a deformation of the rotary joint (5) resulting from an external force effect.Kinematic module (20) according to Claim 1, characterized in that the at least one rotary joint (5) has an articulated head (7), an articulated socket (8) and an elastic element (9), wherein the elastic element (9) presses the articulated head (7) into the articulated socket (8) with a force, such that the articulated head (7) is mounted rotatably in the articulated socket (8) without play.Kinematic module (20) according to Claim 2, characterized in that the at least one mechanical stop device (6) is configured to limit a deformation of the elastic element (9) of the rotary joint (5) resulting from the external force effect.Kinematic module (20) according to one of the preceding claims, characterized in that the mechanical stop device has a first stop element (10) and a second stop element (11) spaced apart from the first stop element (10), wherein the first stop element (10) is configured to abut on the second stop element (11) depending on a maximum deformation of the rotary joint (5), such that the deformation of the rotary joint (5) is limited.Kinematic module (20) according to Claim 4, characterized in that the first stop element (10) is arranged within the second stop element (11) such that it can be rotated about the pivot axis (X) with respect to the second stop element (12).Kinematic module (20) according to claim 2 and according to claim 4 or 5, characterised in that the joint head (7) and the first stop element (10) are firmly connected to the carrier device (3), and the joint socket (8) and the second stop element (11) are firmly connected to the frame device (4).Kinematic module (20) according to Claim 6, characterized in that the carrier device (3) has a first arm (12), on which the joint head (7) is arranged, and a second arm (13), on which the first stop element (10) is arranged.Kinematic module (20) according to claim 7, characterised in that the first extension arm (12) extends substantially perpendicular to the pivot axis (X), wherein the joint head (7) protrudes from the first extension arm (12) along the pivot axis (X).Kinematic module (20) according to either claim 7 or claim 8, characterised in that the second extension arm (13) extends substantially perpendicularly to the pivot axis (X), wherein the first stop element (10) protrudes from the second extension arm (13) along the pivot axis (X).Kinematic module (20) according to one of Claims 6 to 9, characterized in that the joint head (7) and the first stop element (10) are directed opposite one another in the pivot axis (X).Kinematic module (20) according to one of Claims 6 to 10, characterized in that the frame device (4) forms the joint socket (8) and the second stop element (11) in each case integrally.Kinematic module (20) according to one of Claims 6 to 11, characterized in that the joint socket (8) and the second stop element (11) are formed adjacent to one another along the pivot axis (X).Kinematic module (20) according to one of Claims 4 to 12, characterized in that the first stop element (11) is designed as a bolt (11), wherein the bolt (11) has an at least approximately oval profile.Kinematic module (20) according to Claim 13, characterized in that the second stop element (12) is designed as a depression (12), wherein the depression (12) has a slot (14) through which the bolt (11) can be passed during installation of the kinematic module (20).Kinematic module (20) according to Claim 2, characterized in that the elastic element (9) is designed as a sheet metal clamp (9).Kinematic module (20) according to one of the preceding claims, characterized bya stepping motor (15) which is motion-coupled to the frame device (4) and is designed to pivot the frame device (4) with respect to the carrier device (3).Head-up display (1), in particular for a motor vehicle (2), having a kinematic module (20) according to one of the preceding claims.Motor vehicle (2) having a head-up display (1) according to Claim 17.

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