Head-up display device having a mirror element which can be adjusted about a vertical axis, motor vehicle and method for producing a head-up display device

Abstract

The invention relates to a head-up display device for a motor vehicle, comprising a housing and a mirror device (38) which is arranged in the housing. A mirror element (26) of the mirror device (38) is designed to reflect an image provided by an image-generating device during operation of the head-up display device on a translucent projection surface into a field of view of a user of the head-up display device (10). The mirror device (38) has a bearing apparatus (40), by means of which the mirror element (26) is mounted on the housing, wherein the bearing apparatus (40) comprises at least one adjusting element (46). By actuating the at least one adjusting element (46), a rotational position of the mirror element (26) about a vertical axis (36) of the mirror element (26) can be changed. The invention also relates to a motor vehicle having such a head-up display device and to a method for producing the head-up display device.

Description

[0001] Head-up display device with a mirror element adjustable about a vertical axis, motor vehicle and method for manufacturing a head-up display device.

[0002] The invention relates to a head-up display device for a motor vehicle, comprising a housing and a mirror device arranged in the housing. A mirror element of the mirror device is designed to reflect an image provided by an image generation device during operation of the head-up display device onto a translucent projection surface into a field of vision of a user of the head-up display device. Furthermore, the invention relates to a motor vehicle having such a head-up display device and a method for manufacturing the head-up display device.

[0003] DE 10 2018 106 169 A1 describes a head-up display device, or a head-up display, wherein the orientation of an outer housing of the head-up display can be adjusted relative to a motor vehicle component using an adjustment element. This allows the orientation of the head-up display to be adapted to the inclination of a windshield of the motor vehicle if the head-up display uses the windshield as a projection surface. The head-up display comprises an optical device with a mirror, wherein light emitted by a projection device of the head-up display first strikes the mirror and then the projection surface, a shape of the windshield.

[0004] During the manufacture of a head-up display device, also known as a heads-up display, even minor deviations between the actual position of mirror elements of an optical device and a desired position of the mirror elements can result in the virtual image intended to be projected into the user's field of vision being shifted relatively significantly relative to a desired position of the virtual image. In particular, if the virtual image is offset horizontally relative to the desired position of the virtual image, this can be counteracted by shifting the image provided on a screen or display of the image generation device within the area of ​​the screen. However, this requires the screen to be designed larger than would be necessary to output the image provided by the image generation device.Furthermore, to correct the horizontal offset, appropriately sized openings for the mirror elements and the light reflected by them can be provided in the housing of the head-up display device. This, in turn, may require the head-up display device to be designed larger overall than would be desirable.

[0005] If, on the other hand, a specified size of the head-up display device is not to be exceeded, limitations may arise regarding the optical performance of the head-up display. This may manifest itself in a restricted field of view and / or a reduced distance between the user and the virtual image and / or a reduced size of the so-called eyebox. The eyebox indicates the area within which the user's eyes must be located in order to see the virtual image.

[0006] The measures described above for compensating tolerances, which particularly concern the alignment of at least one mirror element of the optical device, are therefore unfavorable.

[0007] The object of the present invention is to provide a head-up display device of the type mentioned at the outset, in which high requirements for a precise arrangement of the mirror element in the housing can be met, as well as to provide a motor vehicle with the head-up display device and a corresponding method for manufacturing a head-up display device.

[0008] This object is achieved by a head-up display device having the features of patent claim 1, a motor vehicle having the features of patent claim 13, and a method having the features of patent claim 14. Advantageous embodiments with expedient further developments of the invention are given in the dependent patent claims and in the following description.

[0009] The head-up display device according to the invention, or the head-up display for a motor vehicle, comprises a housing and a mirror device arranged in the housing. A mirror element of the mirror device is designed to reflect an image provided by an image generation device during operation of the head-up display device onto a translucent projection surface into a field of vision of a user of the head-up display. The mirror device has a bearing device by means of which the mirror element is mounted on the housing. The bearing device comprises at least one adjustment element, wherein a rotational position of the mirror element about a vertical axis of the mirror element can be changed by actuating the at least one adjustment element.

[0010] Thus, by actuating at least one adjustment element, the rotational position of the mirror element relative to the vertical axis, and thus relative to a vertical axis of the mirror element, can be changed. This is based on the understanding that by pivoting or rotating the mirror element about the vertical axis, an error in the reflection of the image provided by the image generation device during operation of the head-up display device into the user's field of vision can be very easily corrected. Such an error can manifest itself in a deviation of an actual position of the virtual image from a desired position of the virtual image in the horizontal direction.

[0011] This error is also known as a look-over error. When a head-up display is used in a motor vehicle, the image projected into the user's field of vision appears to the user as a virtual image located outside the passenger compartment of the vehicle. In this case, the user typically does not look directly through the windshield at the virtual image surrounding the vehicle, but rather slightly offset from the center. A certain offset of the virtual image in the horizontal direction is therefore always present. However, an undesirably large offset in the horizontal direction is referred to as a look-over error.

[0012] By actuating at least one adjustment element, a respective rotational position of the mirror element can be very precisely adjusted by rotating the mirror element around its vertical axis so that the actual position of the virtual image in the horizontal direction corresponds as closely as possible to the desired position of the virtual image in the horizontal direction. Accordingly, the rotational position of the mirror element around the vertical axis or the orientation of the mirror element relative to the vertical axis can be very easily corrected if there is a corresponding deviation between the actual position of the virtual image and the desired position of the virtual image.

[0013] The vertical axis provides a rotation axis for the mirror element, around which the mirror element can be slightly rotated to assume the desired rotational position. This rotation of the mirror element around the vertical axis is achieved by actuating the at least one adjustment element. Consequently, the head-up display device, which has the at least one adjustment element, can meet high requirements for a precise arrangement of the mirror element in the housing.

[0014] The head-up display device can be configured to display driving instructions or similar elements of augmented reality in the user's field of vision. These elements of the virtual image can be located at a distance of at least ten meters to more than twenty meters from the user's head. Particularly with such a head-up display device, it is particularly important that tolerances in the arrangement of the mirror device in the housing can be mechanically compensated to a particularly large extent. This is possible in the present case by providing at least one adjustment element.

[0015] Particularly when the user's head is at a great distance from the virtual image, even small deviations between the actual position of the mirror element and the desired position of the mirror element can lead to a large offset of the virtual image. Even such a large offset can be easily corrected during manufacture of the head-up display device by actuating at least one adjustment element. For example, a test pattern can be provided for this purpose by the image device as an image, which is reflected into the user's field of vision. By using such a test pattern, particularly in the form of a point grid with a center point, it is very easy to check whether the center point and the other points of the point grid are located at the intended locations or whether there is a deviation.Such a deviation can be corrected very easily by actuating at least one adjustment element.

[0016] The mirror device is preferably held on the housing by means of the at least one adjusting element. As a result, the at least one adjusting element fulfills an additional function beyond the purpose of changing the rotational position of the mirror element relative to the vertical axis. Namely, the at least one adjusting element ensures that the mirror device is secured in position inside the housing. Accordingly, the at least one adjusting element can be designed in the manner of a fastening element, which serves to hold the mirror device in the housing. Such an extended function of the at least one adjusting element is advantageous. The at least one adjusting element preferably has a shaft, wherein an end region of the shaft is received in a receptacle formed in the housing.In this way, during the manufacture or assembly of the head-up display device, the mirror device can be at least pre-positioned in a predetermined position on the housing by inserting the end portion of the shaft into the receptacle. The final rotational position of the mirror element relative to the vertical axis of the mirror element can then be adjusted by actuating at least one adjustment element comprising the shaft. This allows for very fine adjustment of the rotational position of the mirror element.

[0017] The end region of the shaft can have a thread that corresponds to a thread of the receptacle formed in the housing, wherein the mirror element can be displaced in the direction of the vertical axis by rotating the at least one adjustment element about a longitudinal axis of the shaft. In this way, on the one hand, a very secure mounting of the mirror device on the housing can be realized. On the other hand, a position of the mirror element along the vertical axis can be changed by actuating the at least one adjustment element. This is advantageous for achieving a very accurate and precise arrangement of the mirror element in the housing of the head-up display device.

[0018] Preferably, a portion of the at least one adjustment element is designed as an eccentric, with a center point of the eccentric being offset from a longitudinal axis of the shaft. A holding part of the bearing device, on which the mirror element is at least indirectly held, has a guide slot, and the eccentric is guided within the guide slot when the at least one adjustment element is rotated about the longitudinal axis of the shaft. Thus, by rotating the adjustment element about the longitudinal axis of the shaft by means of the eccentric, the holding part of the bearing device can be displaced. This, in turn, changes the rotational position of the mirror element relative to the vertical axis of the mirror element.

[0019] The provision of the adjustment element with the eccentric makes changing the rotational position of the mirror element around the vertical axis of the mirror element particularly easy. Even a slight rotation of the adjustment element around the longitudinal axis of the shaft leads to a corresponding displacement of the eccentric, designed like a cam, in the guide slot, which is formed on the holding part or in the holding part of the bearing device. This, in turn, is accompanied by a very finely controlled rotation or rotary movement of the mirror element around the vertical axis of the mirror element. This movement mechanism can be implemented particularly easily if the longitudinal axis of the shaft of the adjustment element is aligned parallel to the vertical axis of the mirror element.

[0020] In particular, a head of the adjusting element can be designed as the eccentric. Accordingly, the adjusting element can be designed in the manner of a screw bolt, in which the eccentric is provided by the head of the screw bolt. Such an adjusting element can be operated particularly easily if a tool is applied to the head of the screw bolt, which has the eccentric cam.

[0021] Preferably, the holding part has a bearing point that is spaced transversely to the vertical axis of the mirror element from the adjusting element having the eccentric. The holding part is held to the housing by means of an additional fastening element arranged at the bearing point. This ensures particularly secure mounting of the mirror device on the housing or within the housing.

[0022] Preferably, a certain amount of play is provided in the area of ​​the bearing point where the additional fastening element is arranged, allowing movement of the holding part perpendicular to the vertical axis upon actuation of the adjusting element with the eccentric. This allows the movements of the holding part, which can be effected by rotating the adjusting element with the eccentric about the longitudinal axis, to be realized particularly easily and unhindered.

[0023] The further fastening element can be designed as a second adjustment element, which is functionally identical to the adjustment element having the eccentric. In this case, a portion of the second adjustment element designed as an eccentric is guided in a further guide slot formed on the holding part when the second adjustment element is rotated about a longitudinal axis of a shaft of the second adjustment element. By providing two independently operable adjustment elements with respective eccentrics, the rotational position of the mirror element relative to the vertical axis of the mirror element can be adjusted particularly precisely. The eccentric or eccentric cam of the second adjustment element can in particular be designed as the head of the second adjustment element. The second adjustment element can therefore also be designed in the manner of a screw bolt, in which the head of the screw bolt is designed as the eccentric.The second adjustment element can be operated particularly easily by placing a tool on the head in the form of the eccentric of the second adjustment element.

[0024] The bearing device can comprise a plate element arranged on the holding part, with the mirror element resting against a contact surface of the plate element. This achieves a very robust and resilient fixation of the mirror element relative to the holding part.

[0025] In particular, the mirror element can be secured to the plate element by means of an adhesive. This prevents the mirror element from becoming detached from the plate element in a particularly safe and reliable manner.

[0026] Preferably, the at least one adjustment element can be actuated by means of a tool, wherein the at least one adjustment element has an engagement area for the application of the tool. This makes the actuation of the at least one adjustment element simple and reliable.

[0027] Preferably, the engagement area of ​​the at least one adjustment element is accessible to the tool from an outside of the housing. This allows the rotational position of the mirror element about its vertical axis to be changed even when the housing in which the mirror device is arranged is completely closed, without having to open the housing. Thus, the at least one adjustment element can be actuated from outside the housing, which is designed to be closed to the environment. This is particularly advantageous.

[0028] In particular, corrective adjustments can be made in this way during the manufacture of the head-up display device with the housing closed, in which the rotational position of the mirror element is changed about the vertical axis.

[0029] Preferably, the mirror element of the mirror device is designed as a magnifying mirror of an optical device of the head-up display device, wherein the optical device comprises at least one further mirror element. This is based on the knowledge that the magnifying mirror is usually larger than the at least one further mirror element of the optical device. Therefore, the tolerances with regard to the manufacture and assembly of the magnifying mirror or aspherical mirror are usually larger than for the at least one further mirror element. Accordingly, it is advantageous to make the adjustments on the mirror element in the form of the magnifying mirror which involve changing the rotational position of the mirror element about the vertical axis of the mirror element.

[0030] The at least one further mirror element of the optical device can be designed, in particular, as a folding mirror, which deflects the image provided by the image generation device during operation of the head-up display device toward the magnifying mirror. The provision of at least one folding mirror is particularly advantageous for achieving a compact design of the housing of the head-up display device.

[0031] The head-up display device preferably comprises an adjustment device by means of which a rotational position of the mirror element can be changed about a transverse axis of the mirror element oriented perpendicular to the vertical axis of the mirror element. The adjustment device has an actuating part that engages the bearing device. This provides a particularly diverse adjustment option for the mirror element. This is because misalignments of the mirror element relative to the transverse axis of the mirror element can also be easily corrected. As a result, an actual position of the mirror element relative to the respective rotational position of the mirror element, both about the vertical axis and about the transverse axis, can be very precisely at least approximated to a desired position of the mirror element. This is advantageous.

[0032] The rotational position of the mirror element around its transverse axis can be easily adjusted if the adjustment device includes a servomotor. This is because operating the servomotor can then change the rotational position of the mirror element around its transverse axis. This is advantageous for fine adjustment of the mirror element.

[0033] Preferably, the head-up display device comprises the image generating device, wherein the image generating device is arranged in the housing of the head-up display device. Thus, during operation of the head-up display device, the image generating device can provide the image to be reflected on the light-transmissive projection surface of the user's field of vision.

[0034] The motor vehicle according to the invention has a head-up display device according to the invention, which can also be referred to as a head-up display of the motor vehicle.

[0035] When using the head-up display device or head-up display in the motor vehicle, the translucent projection surface can be designed as the windshield of the motor vehicle. Additionally or alternatively, the projection surface can be provided by a pane formed separately from the windshield of the motor vehicle. Accordingly, it is possible to reflect the image provided by the image generation device into the user's field of vision at the translucent pane formed as a so-called combiner. Such a combiner is designed as a component separate from the windshield or front window of the motor vehicle.

[0036] In the method according to the invention for manufacturing a head-up display device for a motor vehicle, a mirror device of the head-up display device is arranged in a housing of the head-up display device. A mirror element of the mirror device is designed to reflect an image provided by an image generation device during operation of the head-up display device onto a translucent projection surface into a field of vision of a user of the head-up display device. The mirror device has a bearing device by means of which the mirror element is mounted on the housing. The bearing device comprises at least one adjusting element, wherein actuation of the at least one adjusting element changes a rotational position of the mirror element about a vertical axis of the mirror element.

[0037] The method allows for meeting high demands for a precise arrangement of the mirror element in the housing. By changing the rotational position of the mirror element around the vertical axis, a deviation between an actual rotational position and a desired rotational position of the mirror element can be very easily corrected. The advantages and preferred embodiments described for the head-up display device according to the invention also apply to the motor vehicle according to the invention and to the method according to the invention, and vice versa.

[0038] The features and feature combinations mentioned above in the description, as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figures, can be used not only in the respective combination specified, but also in other combinations without departing from the scope of the invention. Thus, embodiments are also to be considered encompassed and disclosed by the invention that are not explicitly shown and explained in the figures, but which emerge and can be produced by separate feature combinations from the explained embodiments. Embodiments and feature combinations are also to be considered disclosed that therefore do not have all the features of an originally formulated independent claim.Furthermore, embodiments and combinations of features are to be regarded as disclosed, in particular by the embodiments set out above, which go beyond or deviate from the combinations of features set out in the reliances of the claims.

[0039] Further features of the invention emerge from the claims, the figures, and the description of the figures. These show:

[0040] Fig. 1 shows schematically a head-up display device installed in a motor vehicle, in which an optical device comprises a magnifying mirror and a folding mirror;

[0041] Fig. 2 schematically shows the problem of incorrect alignment of a mirror element of the optical device, in particular in the form of the magnifying mirror;

[0042] Fig. 3 shows a further illustration of the effects of different rotational positions of the magnifying mirror on the position of a virtual image;

[0043] Fig. 4 shows a partial and schematic view of a mirror device of the head-up display device according to Fig. 1, wherein the mirror device comprises a bearing device with a holding part and with a plate element; Fig. 5 shows a schematic view of an adjustment element of the head-up display device in the form of an adjustment screw, wherein the adjustment screw has a head designed as an eccentric;

[0044] Fig. 6 is a perspective view, partially in section, of a receptacle formed in a housing of the head-up indicator device, in which receptacle an end portion of a shaft of the adjusting screw shown in Fig. 5 is received;

[0045] Fig. 7 shows in a schematic plan view the arrangement of the head of the adjusting screw, designed as an eccentric, within a guide slot which is provided on the holding part of the bearing device;

[0046] Fig. 8 shows a housing part of a housing of the head-up display device, wherein the mirror device is mounted in the housing part, and wherein a position of fastening points is indicated which are used for fastening the mirror device in the housing part.

[0047] Fig. 9 is the view according to Fig. 8, wherein the magnifying mirror is removed from the plate element of the bearing device;

[0048] Fig. 10 schematically shows an initial position of the holding part having the guide slot and the mirror element in the form of the magnifying mirror, wherein the adjusting screw according to Fig. 5 is arranged within the guide slot;

[0049] Fig. 11 schematically shows the changing of the rotational position of the mirror element about a vertical axis of the mirror element by actuating the adjusting screw having the eccentric;

[0050] Fig. 12 shows a variant of the mirror device in which the holding part can be fixed to the housing by means of two adjusting elements, which are designed as eccentric screws or adjusting screws having respective eccentrics; and

[0051] Fig. 13 is a view of an outer side of the housing part shown in Fig. 8 and in Fig. 9, showing a position of the adjusting screws or screw bolts which can be actuated to change the rotational position of the mirror element about the vertical axis or relative to the vertical axis when the housing is closed.

[0052] In the figures, identical or functionally identical elements are provided with identical reference symbols.

[0053] Fig. 1 shows a highly schematic view of a head-up display or head-up display device 10 installed in a motor vehicle 12. Of the motor vehicle 12, only a translucent projection surface in the form of a windshield 14 or windscreen of the motor vehicle 12 is shown in Fig. 1. Furthermore, Fig. 1 schematically depicts a user 16 of the head-up display device 10, who looks through the windshield 14 into an environment 18 of the motor vehicle 12. In the environment 18, the user 16 sees a virtual image 20, which is schematically depicted in Fig. 2.

[0054] The virtual image 20 is provided by an image generation device 22 of the head-up display device 10, which is shown only schematically in Fig. 1 and Fig. 2. Furthermore, both Fig. 1 and Fig. 2 show a beam path during the reflection of the image provided by the image generation device 22 across the translucent projection surface into the field of view of the user 16. Accordingly, the image provided by the image generation device 22 first reaches a mirror element in the form of a folding mirror 24 and from there to a mirror element 26, which in the design of the head-up display device 10 shown in Fig. 1 and Fig. 2 is designed as a magnifying mirror.

[0055] The folding mirror 24 and the mirror element 26 are components of an optical device 28 of the head-up display device 10, wherein the optical device 28 is arranged within a housing 30 of the head-up display device 10. Consequently, the mirror element 26, which is designed as a magnifying mirror or aspherical mirror, is also arranged within the housing 30 of the head-up display device 10. In Fig. 2, instead of the user 16 schematically illustrated in Fig. 1, a so-called eyebox 32 is shown, i.e., a field within which the eyes of the user 16 must be located so that the user 16 can see the virtual image 20.

[0056] Fig. 2 also shows an offset virtual image 34 whose actual position does not match the desired position of the virtual image 20 (also shown in Fig. 2). Such an offset of the offset virtual image 34 relative to the correctly positioned virtual image 20 can occur, in particular, due to tolerances of mechanical components of the head-up display device 10.

[0057] In the offset virtual image 34 shown in Fig. 2, there is, in particular, an offset in the horizontal direction. Such an offset results primarily from an incorrect rotational position of the mirror element 26 in the form of the comparatively large aspherical mirror in this case about a vertical axis 36 of the mirror element 26. The vertical axis 36 of the mirror element 26 is indicated in the illustrations according to Fig. 3 and Fig. 4 for illustrative purposes.

[0058] In Fig. 3, the virtual image 20 and the offset virtual image 34 are also shown schematically, the different positions of which are based on different rotational positions of the mirror element 26 about the vertical axis 36 or relative to the vertical axis 36 of the mirror element 26.

[0059] The respective rotational positions of the mirror element 26 and the associated beam paths are also shown in Fig. 3 for illustrative purposes, with the illustrated beam paths preferably starting at one and the same point on the image generation device 22. For example, with reference to Fig. 3, consider the case where a camera (not shown) is located at the location of the eyebox 32 (see Fig. 2). This camera therefore views the image generation device 22 from different angles, which projects the image reflected by the folding mirror 24 and the mirror element 26 into the field of view of the user 16 (see Fig. 1).

[0060] From Fig. 3 it can be seen that even with a comparatively small change in the rotational position of the mirror element 26 about the vertical axis 36, a comparatively large offset of the offset virtual image 34 relative to the virtual image 20 located at its desired position can be determined.

[0061] In the head-up display device 10 described here, measures can be taken to change the rotational position of the mirror element 26 about the vertical axis 36 and thus correct an incorrect position of the offset virtual image 34 in the horizontal direction. In particular, this ensures that, during operation of the head-up display device 10, the virtual image 20 is provided at the correct position intended for it in the environment 18 of the motor vehicle 12.

[0062] The corresponding adjustment mechanism will be explained with reference to the figures explained below. According to Fig. 4, the mirror element 26 is part of a mirror device 38, which on the one hand comprises the mirror element 26 and on the other hand a bearing device 40. By means of the bearing device 40, the mirror element 26 is mounted on the housing 30, which is not shown in Fig. 4. The arrangement of components of the bearing device 40 in a housing part 76 of the housing 30 can be seen in Fig. 8. Of the bearing device 40, a holding part 42 and a plate element 44 arranged on the holding part 42 are shown in Fig. 4. The mirror element 26 is held on the plate element 44, for example by means of an adhesive.

[0063] Fig. 4 shows, in a highly schematic manner, a position of a screw bolt serving as an adjusting screw, which is designed as the first adjusting element 46 of the bearing device 40. In this regard, Fig. 4 only shows the spatial arrangement of the adjusting element 46 on the holding part 42.

[0064] By actuating the adjustment element 46, a rotational position of the mirror element 26 about the vertical axis 36 of the mirror element 26 can be changed. To explain a possible mode of operation of the adjustment element 46 when changing the position or orientation of the mirror element 26 relative to the vertical axis 36, reference should be made to Fig. 5, Fig. 6, and Fig. 7.

[0065] According to Fig. 5, a portion of the adjusting element 46, which is designed, for example, in the manner of a screw bolt, can be designed as an eccentric 48. The adjusting element 46 shown in Fig. 5 and serving as an adjusting screw has a shaft 50, with a thread 52 formed in an end region of the shaft 50. Fig. 5 also indicates a longitudinal axis 54 of the shaft 50. Accordingly, it is clearly evident from Fig. 5 that a center point of the eccentric 48 is arranged offset from the longitudinal axis 54 of the shaft 50.

[0066] Furthermore, the adjustment element 46 has an engagement area 56, to which a tool (not shown) can be applied in order to rotate the adjustment element 46 about the longitudinal axis 54 of the shaft 50. The eccentric 48 of the adjustment element 46 thus also participates in a rotation about the longitudinal axis 54 of the shaft 50 that can be effected by means of the tool.

[0067] In the exemplary configuration of the adjusting element 46 shown in Fig. 5, the engagement region 56 is designed as a hexagon socket, into which a tool with an external hexagon profile can be inserted in order to rotate the adjusting element 46 about the longitudinal axis 54 of the shaft 50. However, other engagement regions than the hexagon socket shown here as an example may also be provided, such as a slotted profile, a Phillips profile, or the like.

[0068] Fig. 6 shows a section of a portion of the housing 30 to which the mirror device 38 is secured using the adjustment element 46. A receptacle 58 is formed in the housing 30, in which the end portion of the shaft 50 is received. In this case, the receptacle 58 has an internal thread 60, which corresponds to the thread 52 formed on the end portion of the shaft 50.

[0069] Preferably, in the present case, the eccentric 48 formed as the head of the adjusting element 46 is not brought into abutment with the portion of the housing 30 shown in Fig. 6. Rather, it can be provided that an underside 62 of the eccentric 48 (see Fig. 5) is supported on a helical spring 64 when the adjusting element 46 is screwed into the receptacle 58. This helical spring 64 is shown in section in Fig. 6 and surrounds the shaft 50 of the adjusting element 46. This ensures that the adjusting element 46 is well secured against loosening without the eccentric 48 having to be brought into abutment with the housing 30. Fig. 7 shows a guide slot 66 formed on the holding part 42 of the bearing device 40, within which the eccentric 48 is guided when the adjusting element 46 is rotated about the longitudinal axis 54 of the shaft 50.The guide slot 66 is slightly larger than a longest extension of the eccentric 48 perpendicular to the longitudinal axis 54 of the shaft 50. The eccentric 48 can be rotated within the guide slot 66 about the longitudinal axis 54 of the shaft 50, wherein the guide slot 66 can be designed, for example, in the manner of a collar or similar wall surrounding the eccentric 48. If the adjusting element 46 having the eccentric 48 is rotated about the longitudinal axis 54 of the shaft 50, this leads to a rotation of the holding part 42 and thus of the mirror element 26 about the vertical axis 36 of the mirror element 26. The corresponding movement of the holding part 42 and with it of the mirror element 26 about the vertical axis 36 of the mirror element 26 can be seen, for example, in Fig. 10 in conjunction with Fig. 11.

[0070] Fig. 4 further shows that the head-up display device 10 preferably comprises an adjustment device 68, by means of which a rotational position of the mirror element 26 can be changed about a transverse axis 70 of the mirror element 26, which is oriented perpendicular to the vertical axis 36. The adjustment device 68 can comprise a servomotor 72, which is shown only very schematically in Fig. 4.

[0071] In this case, the servomotor 72 acts on an actuating part 74, which engages the plate element 44. The actuating part 74, which is fork-shaped, for example, can thus pivot the mirror element 26 about the transverse axis 70 of the mirror element 26. In this way, deviations of the offset virtual image 34 (see Fig. 2) from the desired position of the virtual image 20 in the vertical direction can be easily and effectively compensated.

[0072] Fig. 8 shows a plan view of the housing part 76 of the housing 30 of the head-up display device 10, with the mirror element 26 and the folding mirror 24 being arranged at least partially within the housing part 76. Furthermore, Fig. 8 shows the holding part 42, which can be adjusted by actuating the at least one adjusting element 46 (see Fig. 5) in order to change the rotational position of the mirror element 26 about the vertical axis 36. The illustration in Fig. 8 shows a first location 80, which, in the view into the housing part 76 according to Fig. 8, merely indicates the approximate position of the adjusting element 46. The adjusting element 46 is actuated from an outer side 102 of the housing part 76 (see Fig. 13), which is not visible in Fig. 8.

[0073] Furthermore, Fig. 8 shows a further bearing point 78 of the holding part 42, which is spaced transversely to the vertical axis 36 of the mirror element 26 from this first point 80, wherein the adjusting element 46 is arranged at the first point 80 in the assembled state of the head-up display device 10 (see Fig. 1).

[0074] The holding part 42 can be secured to the housing part 76 by means of an additional fastening element arranged at the further bearing point 78, for example in the form of a screw bolt 82 shown schematically in Fig. 10. Accordingly, both the screw bolt 82 and the adjusting element 46 (see Fig. 10) can serve to hold or fix the mirror device 38 to the housing part 76 of the housing 30.

[0075] Fig. 9 shows a further view of the housing part 76, with the mirror element 26 not shown. This exposes a contact surface 84 of the plate element 44, against which the mirror element 26 rests in the head-up display device 10.

[0076] Fig. 10 shows a possible starting position of the holding part 42 and therefore also of the mirror element 26, before the rotational position of the mirror element 26 relative to the vertical axis 36 was changed by means of the adjustment element 46. A double arrow 86 in Fig. 10 indicates directions in which the right-hand portion of the holding part 42 in Fig. 10 can be displaced. This in turn leads to the rotation of the mirror element 26, which in this case is held indirectly on the holding part 42, about the rotational axis or vertical axis 36. A corresponding rotational movement of the mirror element 26 about the vertical axis 36 is illustrated in Fig. 10 by a further arrow 88.

[0077] In order to ensure good mobility of the holding part 42 during such adjustment movements of the mirror element 26, a passage opening formed in the holding part 42 for a shaft of the screw bolt 82 (not shown in Fig. 10) can be larger than a diameter of the shaft of the screw bolt 82. Also in Fig. 11, the arrow 88 schematically shows the rotation of the mirror element 26 about its vertical axis 36, as it results when the eccentric 48 is rotated from the position shown in Fig. 10 about the longitudinal axis 54 of the shaft 50 (see Fig. 5) into the position shown in Fig. 11. Accordingly, the pivoting of the mirror element 26 about the vertical axis 36 is accomplished by actuating the adjustment element 46 having the eccentric 48.

[0078] In the variant shown in Fig. 12, the additional fastening element in the form of the screw bolt 82 shown in Fig. 10 is replaced by a second adjusting element 90, which is functionally identical to the first adjusting element 46 having the eccentric 48. In this variant, the second adjusting element 90 accordingly also has a head designed as an eccentric 92. When the second adjusting element 90 rotates about a longitudinal axis 94 of a shaft (not shown in Fig. 12) of the second adjusting element 90, the eccentric 92 is guided in a further guide slot 96, which is formed on the holding part 42.

[0079] In this variant, the pivoting of the mirror element 26 about the vertical axis 36 can be effected both by actuating the first adjusting element 46 and by actuating the second adjusting element 90, as illustrated in Fig. 12 by the arrow 88 and the double arrow 86. In this case, too, it is preferably provided that through openings formed in the holding part 42 for the shaft 50 of the first adjusting element 46 and for the (not shown) shaft of the second adjusting element 90 are larger than the respective diameter of the shaft.

[0080] In Fig. 13, the partial housing or housing part 76 is shown in a view of an underside, which is not visible in the plan view of the housing part 76 from above according to Fig. 8 and Fig. 9.

[0081] However, access points 98, 100 are indicated in Fig. 13, through which the adjustment element 46 and the screw bolt 82 (see Fig. 10) or the two adjustment elements 46, 90 (see Fig. 12) are accessible to a tool from the outer side 102 of the housing part 76. Accordingly, the adjustment of the holding part 42 and the associated pivoting of the mirror element 26 about the rotational axis or vertical axis 36 can be performed with the housing 30 (see Fig. 1) of the head-up display device 10 completely closed. This is particularly advantageous.

[0082] During the manufacture or assembly of the head-up display device 10, a test can be performed at the end of assembly to verify the optical performance of the head-up display device 10. For example, a test grid can be displayed, which is designed as a dot pattern with a plurality of grid points and a center point. This center point can represent the center of the virtual image 20. During the test, it can be checked whether there is an offset of the grid points and the center point from a desired position of these points.

[0083] If this is the case, then in the present case, by means of the adjusting device 68 (see Fig. 4), for example, an offset of the offset virtual image 34 in the vertical direction can first be corrected by adjusting or pivoting the mirror element 26 about its transverse axis 70 (see Fig. 4) by means of the adjusting device 68.

[0084] Furthermore, an undesirable offset of the offset virtual image 34 (see Fig. 2) relative to the correctly positioned virtual image 20 in the horizontal direction can be corrected. For this purpose, a shift of the grid points and the center point in the horizontal direction can be effected by actuating at least one adjustment element 46, 90. Preferably, the adjustment element 46 or the adjustment elements 46, 90 are accessible to the tool from the outside 102 of the housing 30.

[0085] By rotating the at least one adjustment element 46, 90 about the associated longitudinal axis 54, 94, the mirror element 26 can be pivoted about its vertical axis or vertical axis 36. This causes the offset virtual image 34 to be shifted in the horizontal direction until the actual position of the offset virtual image 34 corresponds as closely as possible to the desired position of the virtual image 20 (see Fig. 2). When the originally offset virtual image 34 is then located at the desired position, the rotational position of the mirror element 26 about the vertical axis 36 has been successfully corrected. Additionally or alternatively, it can be provided that at least one of the adjustment mechanisms described above for adjusting the aspherical mirror element 26 is used or provided for the folding mirror 24 (see Fig. 1).

[0086] Overall, the examples show how a mechanical fine adjustment can be provided to compensate for the look-over error in the head-up display or the head-up display device 10, wherein the look-over error is expressed in an offset of the offset virtual image 34 relative to the desired position of the virtual image 20 (see Fig. 2) in the horizontal direction.

Claims

Patent claims 1. A head-up display device (10) for a motor vehicle (12), comprising a housing (30) and a mirror device (38) arranged in the housing (30), wherein a mirror element (26) of the mirror device (38) is designed to reflect an image provided by an image generation device (22) during operation of the head-up display device (10) on a light-transmissive projection surface (14) into a field of view of a user (16) of the head-up display device (10), characterized in that the mirror device (38) has a bearing device (40) by means of which the mirror element (26) is mounted on the housing (30), wherein the bearing device (40) comprises at least one adjusting element (46), and wherein a rotational position of the mirror element (26) about a vertical axis (36) of the mirror element (26) can be changed by actuating the at least one adjusting element (46).

2. Head-up display device (10) according to claim 1, characterized in that the mirror device (38) is held on the housing (30) by means of the at least one adjusting element (46).

3. Head-up display device (10) according to one of the preceding claims, characterized in that the at least one adjusting element (26) has a shaft (50), wherein an end region of the shaft (50) is received in a receptacle (58) which is formed in the housing (30).

4. Head-up display device (10) according to claim 3, characterized in that the end region of the shaft (50) has a thread (52) which engages with a thread (60) of the receptacle (58) formed in the housing (30). corresponds, wherein by rotating the at least one adjusting element (46) about a longitudinal axis (54) of the shaft (50) the mirror element (26) can be displaced in the direction of the vertical axis (36).

5. Head-up display device (10) according to claim 3 or 4, characterized in that a partial region of the at least one adjusting element (46), in particular designed as a head of the adjusting element (46), is designed as an eccentric (48), wherein a center point of the eccentric (48) is arranged offset to a longitudinal axis (54) of the shaft (50), wherein a holding part (42) of the bearing device (40), on which the mirror element (26) is held at least indirectly, has a guide slot (66), and wherein the eccentric (48) is guided within the guide slot (66) when the at least one adjusting element (46) is rotated about the longitudinal axis (54) of the shaft (50).

6. Head-up display device (10) according to claim 5, characterized in that the holding part (42) has a bearing point (78) which is spaced from the adjusting element (46) having the eccentric (48) transversely to the vertical axis (36) of the mirror element (26), wherein the holding part (42) is held on the housing (30) by means of an additional fastening element (82) arranged at the bearing point (78).

7. Head-up indicator device (10) according to claim 6, characterized in that the further fastening element is designed as a second adjusting element (90) which is functionally identical to the adjusting element (46) having the eccentric (48), and wherein a partial area of the second adjusting element (90) designed as an eccentric (92), in particular a head of the second adjusting element (90) designed as an eccentric (92), is guided in a further guide slot (96) which is formed on the holding part (42) when the second adjusting element (90) is rotated about a longitudinal axis (94) of a shaft of the second adjusting element (90).

8. Head-up display device (10) according to one of claims 5 to 7, characterized in that the bearing device (40) comprises a plate element (44) arranged on the holding part (42), wherein the mirror element (26), which is fixed to the plate element (44) in particular by means of an adhesive, rests on a contact surface (84) of the plate element (44).

9. Head-up display device (10) according to one of the preceding claims, characterized in that the at least one adjusting element (46) can be actuated by means of a tool, wherein the at least one adjusting element (46) has an engagement region (56) for the attachment of the tool, and wherein the engagement region (56) is accessible to the tool from an outer side (102) of the housing (30).

10. Head-up display device (10) according to one of the preceding claims, characterized in that the mirror element (26) of the mirror device (38) is designed as a magnifying mirror of an optical device (28) of the head-up display device (10), wherein the optical device (28) comprises at least one further mirror element, in particular designed as a folding mirror (24).

11. Head-up display device (10) according to one of the preceding claims, characterized in that the head-up display device (10) comprises an adjusting device (68) by means of which a rotational position of the mirror element (26) about a transverse axis (70) of the mirror element (26) oriented perpendicular to the vertical axis (36) of the mirror element (26) can be changed, wherein the adjusting device (68), in particular comprising a servomotor (72), has an actuating part (74) which engages the bearing device (40).

12. Head-up display device (10) according to one of the preceding claims, characterized in that the head-up display device (10) comprises the image generating device (22), wherein the image generating device (22) is arranged in the housing (30) of the head-up display device (10).

13. Motor vehicle (12) with a head-up display device (10) according to one of the preceding claims, wherein the light-transmissive projection surface (14) is designed as a windscreen of the motor vehicle (12) and / or is provided by a pane formed separately from the windscreen of the motor vehicle (12).

14. A method for manufacturing a head-up display device (10) for a motor vehicle (12), in which a mirror device (38) of the head-up display device (10) is arranged in a housing (30) of the head-up display device (10), wherein a mirror element (26) of the mirror device (38) is designed to reflect an image provided by an image generation device (22) during operation of the head-up display device (10) on a light-transmissive projection surface (14) into a field of view of a user (16) of the head-up display device (10), characterized in that the mirror device (38) has a bearing device (40) by means of which the mirror element (26) is mounted on the housing (30), wherein the bearing device (40) comprises at least one adjustment element (46),and wherein by actuating the at least one adjusting element (46) a rotational position of the mirror element (26) about a vertical axis (36) of the mirror element (26) is changed.,

Images