The mirror mounting structure and installation method of the head-up display (HUD) and the HUD itself.

Abstract

This disclosure relates to a mirror mounting structure, mounting method, and head-up display (HUD). The mirror mounting structure includes a rotating mirror, a flip bracket, a preload spring, and a preload adjustment member. The rotating mirror has a lens axis; the flip bracket has a pivot mounting groove for matching the lens axis; the preload spring covers the opening of the pivot mounting groove to confine the lens axis within the groove; the preload spring includes a through preload adjustment hole, and the end face of the hole's periphery has a protruding elastic adjustment portion; the preload adjustment member passes through the preload adjustment hole to fix the preload spring to the flip bracket; wherein the elastic adjustment portion deforms during the process of the preload adjustment member pressing the preload spring against the flip bracket, thereby reducing the protrusion height of the elastic adjustment portion. The mirror mounting structure of the HUD disclosed herein can improve the control accuracy of the rotation clearance of the rotating mirror.

Description

Technical Field

[0001] This disclosure relates to the field of head-up display technology, and more specifically, to a mirror mounting structure for a head-up display, a mirror mounting method for a head-up display, and a head-up display itself. Background Technology

[0002] A head-up display (HUD), also known as a head-up monitor, typically contains at least one reflector. This reflector directs the image light emitted from the HUD's internal image source onto a projection medium, such as a car's windshield or a specially designed screen in the cockpit. This allows the driver or other personnel to see a virtual image of a target at a specific location after receiving the image light. HUDs can project important driving information, such as speed and navigation, directly in front of the driver, eliminating the need to look down at instrument panels or other driver assistance displays and thus increasing driving safety.

[0003] Currently, head-up displays typically include at least one rotating mirror that can rotate around an axis to change the imaging position of the target virtual image and match the eye box range corresponding to different drivers' heights and postures. However, the rotating structure of the rotating mirror has a gap, and the control precision of this gap is insufficient. This may result in image jitter due to an excessively large gap, or an excessively small gap leading to an excessive rotational load on the rotating mirror.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this disclosure is to provide a mirror mounting structure for a head-up display, a mirror mounting method for a head-up display, and a head-up display that can improve the control accuracy of the rotation gap of a rotating mirror.

[0006] According to one aspect of this disclosure, a reflector mounting structure for a head-up display is provided, comprising:

[0007] A rotating mirror with a lens axis;

[0008] The flip bracket has a pivot mounting groove for matching the lens pivot.

[0009] A preload spring is used to cover the opening of the rotating shaft mounting groove to confine the lens rotating shaft within the rotating shaft mounting groove; the preload spring includes a through preload adjustment hole, and the end face of the preload adjustment hole is provided with a protruding elastic adjustment part.

[0010] A preload adjustment member is used to pass through a preload adjustment hole to fix the preload spring to the flip bracket; wherein, the elastic adjustment part is used to deform during the process of the preload adjustment member pressing the preload spring against the flip bracket, so as to reduce the protrusion height of the elastic adjustment part.

[0011] In one exemplary embodiment of this disclosure, the elastic adjustment part extends from the periphery of the pre-pressure adjustment hole toward the axial direction of the pre-pressure adjustment hole, and the height of the elastic adjustment part protruding in the free state when it is not compressed gradually increases from the periphery of the pre-pressure adjustment hole toward the axial direction of the pre-pressure adjustment hole.

[0012] In one exemplary embodiment of this disclosure, the width of the elastic adjustment portion gradually decreases from the circumference of the preload adjustment hole towards the axial direction of the preload adjustment hole.

[0013] In one exemplary embodiment of this disclosure, the included angle α between the elastic adjustment part and the end face around the pre-pressure adjustment hole is 40° to 50°.

[0014] In one exemplary embodiment of this disclosure, the elastic adjustment part has a first side surface and a second side surface extending from the circumference of the pre-pressure adjustment hole toward the axial direction of the pre-pressure adjustment hole. The first side surface is used to contact the pre-pressure adjustment member and has a curvature coaxial with the axis of the pre-pressure adjustment hole.

[0015] In one exemplary embodiment of this disclosure, the first side is inclined toward the direction in which the elastic adjustment portion protrudes.

[0016] In one exemplary embodiment of this disclosure, in a direction perpendicular to the periphery of the pre-pressure adjustment hole, the orthographic projection of the first side surface is inside the pre-pressure adjustment hole; the orthographic projection of the edge furthest from the end face of the pre-pressure adjustment hole on the first side surface coincides with the outer periphery of the pre-pressure adjustment hole.

[0017] In one exemplary embodiment of this disclosure, the angle occupied by the elastic adjustment part in the circumferential direction of the pre-pressure adjustment hole is not less than 70° and not more than 100°.

[0018] In one exemplary embodiment of this disclosure, the preload adjustment hole includes a circular connecting hole and an expansion hole located on the outer periphery of the connecting hole. The expansion hole is connected to the connecting hole, and the connecting hole is used for the preload adjustment member to pass through.

[0019] The elastic adjustment parts are arranged in pairs on the end faces around the pre-pressure adjustment hole. The two elastic adjustment parts protrude from the two opposite end faces around the pre-pressure adjustment hole and are symmetrical with respect to the center of the pre-pressure adjustment hole.

[0020] In one exemplary embodiment of this disclosure, the preload spring includes a semi-circular arc-shaped pivot fixing part and connecting parts located on opposite sides of the pivot fixing part. A preload adjustment hole and an elastic adjustment part are provided on the connecting part. The pivot fixing part is used to cover the opening of the pivot mounting groove. The pivot fixing part includes a pressure plate that protrudes inward to the pivot fixing part. The pressure plate is used to contact the lens pivot to confine the lens pivot within the pivot mounting groove.

[0021] The head-up display mirror mounting structure disclosed herein allows for deformation of the elastic adjustment portion on the periphery of the pre-pressure adjustment hole. The amount of deformation varies depending on the degree to which the pre-pressure adjustment member presses the pre-pressure spring against the flip bracket. Therefore, by adjusting the degree of pressure of the pre-pressure adjustment member relative to the flip bracket, the deformation of the elastic adjustment portion can be controlled, thereby applying a controllable preload to the lens rotation axis. This not only presses the rotating mirror to prevent image jitter but also matches the preload of the lens rotation axis with the load of the rotating mirror, without affecting the rotation of the rotating mirror. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0023] To better understand this disclosure, reference may be made to the embodiments shown in the following figures. Components in the figures are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of this disclosure. Additionally, related elements or components may have different arrangements as known in the art. Furthermore, in the figures, the same reference numerals denote the same or similar components in various figures. Wherein:

[0024] Figure 1 This is a schematic diagram of an exemplary embodiment of the head-up display of this disclosure;

[0025] Figure 2 This is a schematic diagram of the reflector mounting structure and reflector transmission system in an exemplary embodiment of the head-up display of this disclosure;

[0026] Figure 3 This is a schematic diagram of an exemplary embodiment of the mirror mounting structure disclosed herein;

[0027] Figure 4 This is an exploded view of a mirror mounting structure in an exemplary embodiment of the head-up display of this disclosure;

[0028] Figure 5This is a schematic diagram of the lens rotation axis in an exemplary embodiment of the mirror mounting structure disclosed herein;

[0029] Figure 6 This is a schematic diagram of the lens pivot and flip bracket in one exemplary embodiment of the mirror mounting structure disclosed herein;

[0030] Figure 7 This is a schematic diagram of a preload spring in an exemplary embodiment of the reflector mounting structure disclosed herein;

[0031] Figure 8 This is a schematic diagram of a preload spring in an exemplary embodiment of the reflector mounting structure disclosed herein;

[0032] Figure 9 This is a schematic diagram of a preload spring in an exemplary embodiment of the reflector mounting structure disclosed herein;

[0033] Figure 10 A schematic diagram of a flip bracket in one exemplary embodiment of the reflector mounting structure of this disclosure;

[0034] Figure 11 This is a schematic diagram of an embedded nut in an exemplary embodiment of the reflector mounting structure disclosed herein;

[0035] Figure 12 This is a schematic diagram showing the eccentricity of the center of gravity and axis of the rotating mirror assembly in one exemplary embodiment of the mirror mounting structure disclosed herein.

[0036] Figure 13 This is a schematic diagram of steps S400 and S500 in an exemplary embodiment of the reflector mounting method of this disclosure.

[0037] The annotations in the attached figures are explained as follows:

[0038] 1. Rotating reflector; 11. Lens pivot; 12. Reflector back plate; 13. Mirror body; 14. Flat section; 15. Extended section; 2. Flip bracket; 21. Pre-installed buckle; 3. Pre-compression spring; 31. Pre-compression adjustment hole; 32. Elastic adjustment part; 321. First side; 322. Second side; 33. Pivot fixing part; 34. Pressure plate; 35. Pre-compression fixing hole; 36. Buckle hole; 4. Pre-compression adjustment component; 41. Embedded nut; 5. Second reflector; 61. Drive motor; 62. Transmission gear; 7. Spring fixing component; 8. Image source; 9. Force gauge. Detailed Implementation

[0039] The technical solutions in the exemplary embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of this disclosure.

[0040] Unless otherwise specified or stated, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The use of terms such as “first” and “second” in this disclosure is for illustrative purposes only and is not intended to limit the number, importance, or order of the objects described. Words such as “comprising” or “including” indicate that the element preceding the word encompasses the elements listed following the word and their equivalents, but does not exclude other elements.

[0041] Furthermore, in this application, directional terms such as "up / down," "front / rear," "left / right," and "inner / outer" are used only to indicate relative positional relationships. For example, for convenience, they are defined relative to the indicated placement of the components in the accompanying drawings, or based on the actual position and state of the head-up display during operation, i.e., according to the vehicle coordinate system. It should be understood that these directional terms are relative concepts and can change accordingly depending on the orientation of the components in the accompanying drawings.

[0042] A head-up display (HUD) is a device that projects image information onto a projection medium, such as a specially designed screen in front of the driver, on the sun visor, in front of the driver's helmet, or on the windshield of a car. To illustrate the solutions of this disclosure, one possible application scenario is illustrated using a head-up display in a car as an example, with the windshield as the projection medium. Those skilled in the art should understand that the head-up display of the exemplary embodiments of this disclosure can also be applied to, for example, sanitation vehicles, fire trucks, and military vehicles, and of course, to fields such as ships and aviation. For example, it can be applied to aircraft such as fighter jets, allowing the driver to track and aim at objects with the assistance of the head-up display.

[0043] To facilitate the explanation of the present disclosure, the working principle of a head-up display (HUD) is first described by way of example. A HUD typically includes an image source 8 and a light adjustment component. The image source 8 generates and projects image light; the light adjustment component adjusts the image light, such as magnifying the image, correcting aberrations, etc., and refracts the image light to the human eye's observation area, i.e., within the driver's eye box, forming an observable virtual image of the target. The eye box is the area where the driver's or observer's eyes are located. In the design of the HUD, the eye box range can be determined based on the driver's height, posture, etc. The eye box defines an effective area for the eye point; only when the observer's eye point is within this effective area can the observer see a satisfactory virtual image of the target.

[0044] For example, image source 8 can be either a display imaging device or a virtual or real image formed by the display imaging device. For instance, the display imaging device may include a liquid crystal display (LCD), whose backlight source may include one or more of lasers, light-emitting diodes (LEDs), organic light-emitting diodes (OLEDs), stimulated fluorescence (SFF) materials, and quantum dot excitation sources; the display imaging device may also include an actively emitting dot matrix screen composed of light-emitting point sources such as LEDs, MicroLEDs, OLEDs, and plasma light-emitting points; or, the display imaging device may also include a projection imaging system based on projection technologies such as Digital Light Processing (DLP), Liquid Crystal on Silicon (LCoS), and Liquid Crystal Display (LCD), driven by light sources such as LEDs, MicroLEDs, OLEDs, lasers, and fluorescence, or combinations thereof, reflected or transmitted through display panels such as Digital Micromirror Display (DMD), LcoS, and LCD, and then projected onto a projection screen via a projection lens; the display imaging device may also include a laser beam scanning (LBS) projection imaging system where a laser beam scans the screen to form an image. All the display imaging devices described above can also serve as image sources 8, as real or virtual images formed by one or more refractions or reflections.

[0045] Exemplarily, the light adjustment component includes a reflector and may also include optical elements such as lenses or waveguides. Exemplarily, the light adjustment component includes at least one reflector for magnifying the image projected by the image source 8. The light adjustment component may consist of a reflector and lens disposed inside the head-up display and a car windshield. In an exemplary embodiment of this disclosure, the head-up display includes a rotating reflector 1 with a lens rotation axis 11. The rotating reflector 1 can rotate around its own axis, i.e., the lens rotation axis 11, under the drive of the reflector transmission system to change the light path inside the head-up display and adjust the height of the virtual image formed by the head-up display to match the driver's height, posture, and driving habits.

[0046] In an exemplary embodiment of this disclosure, the light adjustment assembly further includes a second reflector 5. The image projected by the image source 8 passes sequentially through the second reflector 5, the rotating reflector 1, and the windshield before entering the viewer's eye. The second reflector 5 can be fixed inside the head-up display housing; exemplarily, the second reflector 5 can be a plane mirror. A structural reference for a head-up display according to this disclosure is provided. Figure 1 As shown.

[0047] For example, refer to Figure 2 As shown, the reflector transmission system may include a drive motor 61 and a transmission component. The rotating reflector 1 may be provided with a transmission gear 62, which is connected to the transmission component. The drive motor drives the transmission gear 62 to rotate the rotating reflector 1 around its own axis.

[0048] For example, taking the direction of the axis, i.e., the direction of the lens rotation axis 11, as the length direction of the rotating mirror 1, the transmission gear 62 can be located on the side of the rotating mirror 1 along its length direction, i.e. Figure 2 As shown, a transmission assembly, including a worm gear, is positioned between the rotating mirror 1 and the flip bracket 2 for mounting the lens shaft 11. The rotating mirror 1 meshes with the worm gear via a transmission gear 62. A drive motor drives the worm gear to rotate, causing the transmission gear 62 to move along the worm gear, thereby rotating the rotating mirror 1. In other embodiments, the transmission gear 62 may also be located at the bottom of the rotating mirror 1, i.e., at one end in the width (height) direction of the rotating mirror 1.

[0049] For example, the transmission gear 62 can be a local area of ​​the gear, and the mirror transmission system can also use other motion methods to drive the rotating mirror 1 to rotate. For example, the mirror transmission system can also include a linear push rod motor, a gear and rack transmission mechanism, etc.

[0050] The inventors discovered that excessively large rotational clearance of the rotating mirror 1 can cause image jitter when a vehicle travels over bumpy roads, affecting imaging quality; conversely, excessively small rotational clearance increases the load on the mirror's transmission system, and smaller clearance control also increases component manufacturing costs. In related technologies, the lens shaft 11 of the rotating mirror 1 can be pressed to ensure that the rotating mirror 1 remains in its designed position under certain acceleration impacts, preventing image jitter. However, the preload on the lens shafts 11 on both sides of the rotating mirror 1 is often unbalanced. During rotation, uneven force on both sides can cause image distortion and may also increase the transmission load, leading to abnormal noise, abnormal wear, and other malfunctions. Furthermore, the rotational clearance of the rotating mirror 1 can be controlled by adjusting the dimensions of the components and reducing the fit tolerance between the lens shaft 11 and the matching holes / grooves on the flip bracket 2. This can be achieved by using bearings in conjunction with machined lens shaft 11 or by using precision injection molded parts. However, this approach leads to a significant increase in component costs and a decrease in yield. Furthermore, as the required imaging size of head-up displays increases, the size of the rotating reflector 1 also increases accordingly, making dimensional accuracy more difficult to control.

[0051] To address the aforementioned problems, according to one aspect of this disclosure, a head-up display (HUD) reflector mounting structure is provided, comprising a rotating reflector 1, a flip bracket 2, a pre-pressure spring 3, and a pre-pressure adjustment member 4. The rotating reflector 1 has a lens pivot 11; the flip bracket 2 has a pivot mounting groove for matching the lens pivot 11; the pre-pressure spring 3 covers the opening of the pivot mounting groove to confine the lens pivot 11 within the pivot mounting groove; the pre-pressure spring 3 includes a through pre-pressure adjustment hole 31, and the end face around the hole of the pre-pressure adjustment hole 31 is provided with a protruding elastic adjustment portion 32; the pre-pressure adjustment member 4 passes through the pre-pressure adjustment hole 31 to fix the pre-pressure spring 3 to the flip bracket 2; wherein the elastic adjustment portion 32 is deformed during the process of the pre-pressure adjustment member 4 pressing the pre-pressure spring 3 against the flip bracket 2, so as to reduce the protrusion height of the elastic adjustment portion 32.

[0052] refer to Figure 3 The diagram shown illustrates the mirror mounting structure of the head-up display. Figure 3 for Figure 2A cross-sectional view of section AA. When installing the rotating reflector 1 of the head-up display of this disclosure, the preload adjustment member 4, through the preload spring 3, confines the lens shaft 11 within the shaft mounting groove of the flip bracket 2. The elastic adjustment portion 32 on the periphery end face of the preload adjustment hole 31 can deform, and the amount of deformation varies with the degree to which the preload adjustment member 4 presses the preload spring 3 against the flip bracket 2. Therefore, by adjusting the degree to which the preload adjustment member 4 presses against the flip bracket 2, the deformation of the elastic adjustment portion 32 can be controlled, thereby applying a controllable preload to the lens shaft 11. This not only presses the rotating reflector 1 to prevent image jitter but also matches the preload of the lens shaft 11 with the load of the rotating reflector 1, without affecting the rotation of the rotating reflector 1.

[0053] Specifically, refer to Figure 4 The diagram shows an exploded view of a head-up display (HUD) reflector mounting structure. The rotating reflector 1 can be made of plastic or glass, such as polycarbonate. The rotating reflector 1 may include a reflector back plate 12 and a mirror body 13. The reflector back plate 12 and mirror body 13 can be integrally formed by adhesive bonding, mechanical connection, or insert injection molding. The reflector back plate 12 can improve the rigidity of the rotating reflector 1. Lens pivots 11 can be provided on opposite sides along the length of the rotating reflector 1. Driven by a drive motor 61, the rotating reflector 1 rotates around the axis formed by the lens pivots 11.

[0054] In one exemplary embodiment of this disclosure, reference is made to Figure 5 and Figure 6 As shown, the lens pivot 11 and the left and right side flip brackets 2 adopt the following... Figure 5 As shown in the diagram, the lens pivot 11 can be rotated as follows: Figure 6 As shown. The root of the lens pivot 11 is a flat section 14, meaning that the dimension in one direction of the cross-section is smaller than the dimension in another perpendicular direction. For example, the root of the lens pivot 11 has a chamfered edge or an elliptical cross-section. When the lens pivot 11 is installed on the flip bracket 2, the flat section 14 of the lens pivot 11 is first inserted into the pivot mounting groove, and then rotated at a certain angle to the working position. This facilitates assembly and allows for rough positioning through the fit between the lens pivot 11 and the shaft hole of the pivot mounting groove. For example, the tolerance design for the fit between the lens pivot 11 and the shaft hole of the pivot mounting groove is: shaft tolerance A (±0.1), hole tolerance A.1 (±0.1), and the tolerance is (0-0.2).

[0055] refer to Figure 6As shown, in one exemplary embodiment of this disclosure, the head of the lens pivot 11 has a cylindrical protrusion 15 for contacting and matching with the pre-compression spring 3. When installing the rotating mirror 1, the flip bracket 2, and the pre-compression spring 3, the pre-compression spring 3 is first assembled onto the flip bracket 2. The flip bracket 2 is designed with a pre-installed buckle 21, the orientation of which is opposite to the opening direction of the pivot mounting groove, for pre-installing the pre-compression spring 3. After the rotating mirror 1 is assembled onto the flip bracket 2, it is completed by the spring fixing member 7, which can be a bolt or other threaded connection. After assembly, the pre-compression spring 3 is pressed by the pre-compression adjusting member 4, which can also be a bolt or other threaded connection. When the pre-compression adjusting member 4 is tightened to a certain depth, the pre-compression spring 3 is pressed, causing the elastic adjusting part 32 to deform. When the pre-compression adjusting member 4 is tightened to different depths, the deformation of the elastic adjusting part 32 is different, applying different magnitudes of pre-compression force to the lens pivot 11.

[0056] refer to Figure 3 , Figure 7 , Figure 8 As shown, in one exemplary embodiment of this disclosure, the preload spring 3 includes a semi-circular arc-shaped rotating shaft fixing part 33 and connecting parts located on opposite sides of the rotating shaft fixing part 33. A preload adjustment hole 31 and an elastic adjustment part 32 are disposed on the connecting parts. The rotating shaft fixing part 33 is used to cover the opening of the rotating shaft mounting groove. The connecting parts can be flat. In one exemplary embodiment, each preload spring 3 may have more than one preload adjustment hole 31. For example, two preload adjustment holes 31 are respectively disposed on the connecting parts on opposite sides of the rotating shaft fixing part 33. In another exemplary embodiment, each preload spring 3 includes a preload adjustment hole 31, a connecting part disposed on one side of the rotating shaft fixing part 33, and a preload fixing hole 35 on the other side of the connecting part for connection with the spring fixing member 7.

[0057] refer to Figure 7 , Figure 8 As shown, in an exemplary embodiment of this disclosure, the connecting portion on one side of the rotating shaft fixing part 33 on the preload spring 3 has a preload adjustment hole 31, and the connecting portion on the other side has a preload fixing hole 35 and a snap-fit ​​hole 36. The preload fixing hole 35 is located on the side (inner side) close to the rotating shaft fixing part 33, and the snap-fit ​​hole 36 is located on the side (outer side) away from the rotating shaft fixing part 33. The preload fixing hole 35 is used for the spring fixing member 7 to pass through, and the spring fixing member 7 is screwed into the flip bracket 2. The snap-fit ​​hole 36 is used for the pre-installed snap-fit ​​21 on the flip bracket 2 to pass through from bottom to top.

[0058] In one exemplary embodiment of this disclosure, reference is made to Figures 7 to 9As shown, the pivot fixing part 33 includes a pressure plate 34, which protrudes inward to the pivot fixing part 33. The pressure plate 34 is used to contact the lens pivot 11 to confine the lens pivot 11 within the pivot mounting groove. The pressure plate 34 can be flat; for example, the pressure plate 34 can be parallel to the connecting part.

[0059] In one exemplary embodiment of this disclosure, the elastic adjustment portion 32 extends from the periphery of the pre-pressure adjustment hole 31 towards the axial direction of the pre-pressure adjustment hole 31, and the height of the elastic adjustment portion 32 protruding in its free state without being compressed gradually increases from the periphery of the pre-pressure adjustment hole 31 towards the axial direction of the pre-pressure adjustment hole 31. (See reference...) Figure 8 The schematic diagram of the preloaded spring 3 shown is as follows: Figure 9 The side view of the preload spring 3 shown shows that, in the radial direction of the preload adjustment hole 31, the height of the protrusion of the elastic adjustment part 32 near the axis of the preload adjustment hole 31 is higher than the height of the protrusion of the elastic adjustment part 32 near the periphery of the preload adjustment hole 31.

[0060] During the process of the pre-pressure adjusting component 4 pressing the pre-pressure spring 3 against the flip bracket 2, the pre-pressure adjusting component 4 first compresses one end of the elastic adjusting part 32 near the axis of the pre-pressure adjusting hole 31, and then gradually contacts the part of the elastic adjusting part 32 near the periphery of the pre-pressure adjusting hole 31. This makes the pre-pressure generated by the pre-pressure adjusting component 4 compressing the elastic adjusting part 32 have a more accurate and controllable correspondence with the displacement, which makes it easier to adjust the pre-pressure of the lens rotating shaft 11 by adjusting the pre-pressure adjusting component 4.

[0061] In one exemplary embodiment of this disclosure, the width of the elastic adjustment portion 32 gradually decreases from the circumference of the preload adjustment hole 31 towards the axial direction of the preload adjustment hole 31. (See reference...) Figure 8 As shown, the elastic adjustment part 32 has a sharp corner facing the axis of the pre-pressure adjustment hole 31. During the process of the pre-pressure adjustment member 4 pressing the pre-pressure spring 3 against the flip bracket 2, the pre-pressure adjustment member 4 first compresses the narrower part of the elastic adjustment part 32, and then gradually contacts the wider part of the elastic adjustment part 32, so that the pre-pressure generated by the pre-pressure adjustment member 4 compressing the elastic adjustment part 32 has a more ideal correspondence with the displacement.

[0062] For example, since the elastic adjustment part 32 is set at an angle relative to the plane (connecting plane) where the periphery end face of the pre-pressure adjustment hole 31 is located, and has an arc, the width of the elastic adjustment part 32 described in this disclosure can refer to the width (chord length) of the projection of the elastic adjustment part 32 onto the reference plane, with the plane where the periphery end face of the pre-pressure adjustment hole 31 is located as the reference plane. Similarly, in the description of other exemplary embodiments of this disclosure, unless otherwise specified or stated, geometric physical quantities such as angle, length, and width used in this disclosure can all be based on the plane where the periphery end face of the pre-pressure adjustment hole 31 is located as the reference plane.

[0063] In an exemplary embodiment of this disclosure, the continuous elastic force applied by the elastic adjustment part 32 to the pre-pressure adjustment member 4 can be decomposed into: a component force F1 parallel to the peripheral end face of the pre-pressure adjustment hole 31 outward (from the axis of the pre-pressure adjustment hole 31 to the periphery of the hole), and a component force F2 perpendicular to the peripheral end face of the pre-pressure adjustment hole 31 upward (towards the loosening direction of the pre-pressure adjustment member 4). Since the sharp angle of the opening of the elastic adjustment part 32 embeds into the surfaces of the pre-pressure adjustment member 4 and the connected components (pre-pressure spring 3 and flip bracket 2) during compression, component force F1 can provide a thrust that causes the pre-pressure adjustment member 4 to rotate in the opposite direction, preventing the pre-pressure adjustment member 4 from loosening. Component force F2 applies a continuous elastic force to the pre-pressure adjustment member 4, generating a resistance torque, preventing the pre-pressure adjustment member 4 from loosening. (Reference) Figure 8 As shown, the height of the elastic adjustment part 32 gradually increases in the direction of the pre-pressure adjustment member 4 being screwed in (clockwise direction in the illustrated embodiment). When the pre-pressure adjustment member 4 is screwed out in the opposite direction (counterclockwise direction in the illustrated embodiment), the opening of the elastic adjustment part 32 protrudes in the opposite direction to the screwing out direction, and due to the springback tendency of the elastic adjustment part 32, it will prevent the pre-pressure adjustment member 4 from loosening.

[0064] refer to Figure 9 As shown, based on the force analysis during the compression of the elastic adjustment part 32 by screwing in the pre-pressure adjustment part 4, the angle α between the end face of the elastic adjustment part 32 and the periphery of the pre-pressure adjustment hole 31 affects the component forces F1 and F2. For example, when the angle α between the elastic adjustment part 32 and the periphery of the pre-pressure adjustment hole 31 increases, the component force F1 decreases accordingly, reducing the anti-loosening performance of the structure under vibration and increasing the difficulty of material molding. Conversely, when the angle α between the elastic adjustment part 32 and the periphery of the pre-pressure adjustment hole 31 decreases, the stroke of the elastic adjustment part 32 in the vertical direction of pressing adjustment becomes smaller, making it difficult to adjust and obtain the ideal pre-pressure. In an exemplary embodiment of this disclosure, the angle α between the end face of the elastic adjustment part 32 and the periphery of the pre-pressure adjustment hole 31 is 40° to 50°. For example, the angle α between the elastic adjustment part 32 and the end face of the preload adjustment hole 31 is 45°, so that the parts of the mirror mounting structure disclosed herein can maintain their position and preload on the lens shaft 11 under bumps and vibrations.

[0065] In one exemplary embodiment of this disclosure, reference is made to Figure 8 As shown, the elastic adjustment part 32 has a first side surface 321 and a second side surface 322 extending from the circumference of the pre-pressure adjustment hole 31 toward the axis of the pre-pressure adjustment hole 31. The first side surface 321 is used to contact the pre-pressure adjustment member 4. Exemplarily, the first side surface 321 has a curvature coaxial with the axis of the pre-pressure adjustment hole 31. When the pre-pressure adjustment member 4 is screwed in, the first side surface 321 adapts to the pre-pressure adjustment member 4, avoiding difficulty in screwing in the pre-pressure adjustment member 4.

[0066] For example, the first side surface 321 is inclined toward the direction in which the elastic adjustment portion 32 protrudes. (See reference) Figure 8 As shown, for example, for the elastic adjustment part 32 protruding above the preload spring 3 (in the direction of the rotating shaft fixing part 33), the first side surface 321 is inclined upward, that is, the first side surface 321 is arranged to expand outward from bottom to top, and the diameter of the upper edge of the first side surface 321 (the side of the first side surface 321 away from the preload adjustment hole 31) relative to the axis of the preload adjustment hole 31 is greater than the diameter of the lower edge of the first side surface 321 (the side of the first side surface 321 close to the preload adjustment hole 31) relative to the axis of the preload adjustment hole 31. For example, for the elastic adjustment part 32 protruding below the preload spring 3, the first side surface 321 is inclined downward, that is, the first side surface 321 is arranged to expand outward from top to bottom, and the diameter of the upper edge of the first side surface 321 (the side of the first side surface 321 close to the preload adjustment hole 31) relative to the axis of the preload adjustment hole 31 is smaller than the diameter of the lower edge of the first side surface 321 (the side of the first side surface 321 away from the preload adjustment hole 31) relative to the axis of the preload adjustment hole 31.

[0067] In one exemplary embodiment of this disclosure, reference is made to Figure 7 As shown, in the direction perpendicular to the periphery of the preload adjustment hole 31, the orthographic projection of the first side surface 321 lies within the preload adjustment hole 31; the orthographic projection of the edge of the first side surface 321 furthest from the end face of the preload adjustment hole 31 coincides with the outer periphery of the preload adjustment hole 31. For example, for the elastic adjustment part 32 protruding above the preload spring 3, the edge of the first side surface 321 furthest from the end face of the preload adjustment hole 31 is the upper edge of the first side surface 321, that is, the orthographic projection of the lower edge of the first side surface 321 lies within the preload adjustment hole 31, and the orthographic projection of the upper edge of the first side surface 321 coincides with the outer periphery of the preload adjustment hole 31. For example, for the elastic adjustment part 32 protruding below the preload spring 3. The first side surface 321 is inclined downward. The edge of the first side surface 321 that is farthest from the end face of the pre-pressure adjustment hole 31 is the lower edge of the first side surface 321. That is, the orthographic projection of the upper edge of the first side surface 321 is inside the pre-pressure adjustment hole 31, and the orthographic projection of the lower edge of the first side surface 321 coincides with the outer periphery of the pre-pressure adjustment hole 31.

[0068] In one exemplary embodiment of this disclosure, reference is made to Figure 7 and Figure 8 As shown, the angle occupied by the elastic adjustment part 32 in the circumferential direction of the preload adjustment hole 31 is less than 180°. For example, the angle occupied by the elastic adjustment part 32 in the circumferential direction of the preload adjustment hole 31 is not less than 70° and not more than 100°, which allows the preload spring 3 to obtain an ideal preload and displacement relationship without affecting the installation of the preload adjustment member 4 or the molding of the elastic adjustment part 32. For example, the angle occupied by the elastic adjustment part 32 in the circumferential direction of the preload adjustment hole 31 is 90° to 95°.

[0069] For example, the angle occupied by the elastic adjustment part 32 in the circumferential direction of the pre-pressure adjustment hole 31 can refer to the maximum included angle between the lines connecting each point on the orthographic projection of the elastic adjustment part 32 to the axis of the pre-pressure adjustment hole 31 in the reference plane where the end face of the pre-pressure adjustment hole 31 is located.

[0070] In one exemplary embodiment of this disclosure, elastic adjustment portions 32 are arranged in pairs on the end faces around the preload adjustment holes 31. (See reference...) Figures 7 to 9 As shown, two paired elastic adjustment portions 32 protrude from opposite end faces around the preload adjustment hole 31. That is, one elastic adjustment portion 32 protrudes above the preload spring 3 (in the direction of the rotating shaft fixing portion 33), and the other elastic adjustment portion 32 protrudes below the preload spring 3. For example, refer to... Figure 9 As shown, the two paired elastic adjustment parts 32 are symmetrical about the center of the pre-pressure adjustment hole 31. The center of the pre-pressure adjustment hole 31 is the midpoint of the axis of the pre-pressure adjustment hole 31 within the hole. The paired elastic adjustment parts 32, being symmetrical about the center of the pre-pressure adjustment hole 31, can provide pre-pressure on both the upper and lower surfaces of the pre-pressure spring 3. Furthermore, the protrusion height of both elastic adjustment parts 32 gradually increases in the direction in which the pre-pressure adjustment member 4 is screwed in, thus preventing the pre-pressure adjustment member 4 from loosening when it has a tendency to screw out in the opposite direction.

[0071] refer to Figure 7 , Figure 8 As shown, the preload adjustment hole 31 includes a circular connecting hole and an expansion hole located on the outer periphery of the connecting hole, the expansion hole being connected to the connecting hole. The circular connecting hole is used for the preload adjustment component 4 to pass through, and the expansion holes can be arranged in pairs and are symmetrical about the center of the preload adjustment hole 31, as shown in the reference diagram. Figure 8 As shown, the expansion hole can be adjacent to the elastic adjustment part 32. Specifically, the expansion hole can be adjacent to the second side surface 322 of the elastic adjustment part 32.

[0072] refer to Figure 10 , Figure 11As shown, an embedded nut 41 is designed on the lower part of the flip bracket 2 (the side away from the preload spring 3). The preload adjustment component 4 has locking adhesive. The embedded nut 41 cooperates with the preload adjustment component 4 to stably maintain the posture of the preload spring 3. For example, the preload adjustment component 4 is an M3*10 machine screw.

[0073] In one exemplary embodiment of this disclosure, after the pre-compression spring 3, the rotating reflector 1 and the flipping bracket 2 are assembled, the pre-compression amount of the pre-compression spring 3 is designed to be 0.1 mm. At this time, due to the cumulative effect of tolerance, the actual pre-compression amount of the spring is -0.2 to 0 mm. The pre-compression spring 3 is adjusted and tightened by the pre-compression adjusting member 4. When the pre-compression adjusting member 4 is tightened to the lower surface limit of the pre-compression spring 3 by 2 mm, the pre-compression spring 3 is tightened.

[0074] In one exemplary embodiment of this disclosure, a lens pivot 11 is provided on both sides of the rotating reflector 1. Correspondingly, the lens pivot 11 on both sides is mounted on the flip bracket 2 on both sides via a pre-compression spring 3. For the pre-compression spring 3 and flip bracket 2 on both sides of the rotating reflector 1, the description of the above exemplary embodiment can be referred to. The pre-compression spring 3 and flip bracket 2 on both sides can be symmetrically arranged.

[0075] In one exemplary embodiment of this disclosure, the thickness of the preload spring 3 is 0.4-0.6 mm. For example, the material of the preload spring 3 is SUS316, and the thickness is 0.6 mm. The height of the elastic adjustment part 32 protruding from the periphery of the preload adjustment hole 31 is 1 mm, referring to... Figure 3 As shown, in the free state, the thickness b at the elastic adjustment part 32 on the preload adjustment member 4 is 0.6mm + 1mm + 1mm = 2.6mm.

[0076] The simulation calculation results of the preload corresponding to the preload of preload spring 3 are shown in the table below:

[0077] Table 1:

[0078] Preload Force applied to lens pivot 11 (N) Preloaded spring sheet 3 stress / MPa 0.2 51.6 418.8 0.15 37.8 310.2 0.1 26 196.1 0.05 10.8N 86.1

[0079] For example, the acceleration requirement for mechanical impact on a typical vehicle is 10g, meaning the head-up display (HUD) is required to not experience image jitter failure under 10g acceleration. Taking the weight of the HUD's reflector mounting structure as 500g as an example, the maximum impact force is F = ma = 500g * 10 * 9.8 N / kg = 49N. Therefore, the preload of the rotating shaft 11 on one side of the rotating reflector 1 should not be less than 24.5N.

[0080] According to simulation results, when the preload of the preload spring 3 is 0.1mm, the corresponding preload of the lens shaft 11 is 26N, which meets the usage requirements (26N > 24.5N). Simultaneously, the calculated stress of the preload spring 3 at this time is 196.1MPa, which is less than the yield strength of the SUS316 material of the preload spring 3 (295MPa). Therefore, it satisfies the preload requirement for the lens shaft 11 while ensuring that the preload spring 3 does not undergo plastic deformation. The 0.1mm preload corresponds to a clamping stroke of 0.25mm. For example, the preload adjustment component 4 is a standard M3 screw with a pitch of 0.5mm, and adjusting half a turn corresponds to a clamping stroke of 0.25mm.

[0081] It should be noted that the above example uses a reflector mounting structure weighing 500g. When the weight of the reflector mounting structure decreases, the required preload also decreases accordingly; when the weight of the reflector mounting structure increases, the required preload also increases accordingly. Similarly, when the acceleration requirement of the vehicle's mechanical impact changes, the required preload changes accordingly, and it is necessary to re-determine the material and thickness of the preload spring 3, as well as the clamping stroke of the elastic adjustment part 32.

[0082] In an exemplary embodiment of this disclosure, the material of the preload spring 3 is determined based on the weight of the reflector mounting structure and the acceleration requirements of the vehicle's mechanical impact. For example, the stress corresponding to the preload spring 3 is less than the yield strength of the material of the preload spring 3 when the elastic adjustment part 32 meets the minimum preload of the single-sided lens shaft 11. For example, taking the acceleration requirement of the vehicle's mechanical impact as 10g and the weight of the reflector mounting structure as 500g, the minimum preload of the single-sided lens shaft 11 is 24.5N. Through experiments or simulation calculations, for SUS304 material with a yield strength of 205MPa, the stress corresponding to the preload spring 3 exceeds 205MPa when 24.5N is applied, indicating that the preload spring 3 of this material will undergo plastic deformation under this standard working condition and cannot achieve the design target.

[0083] For example, the material of the preload spring 3 is determined based on the weight of the reflector mounting structure and the acceleration requirements of the vehicle's mechanical impact. This also includes ensuring that the ratio of the preload value of the preload spring 3 under suitable deformation to the minimum preload of the single-sided lens shaft 11 is close to 1. Specifically, taking a vehicle mechanical impact acceleration requirement of 10g and a reflector mounting structure weight of 500g as an example, the minimum preload of the single-sided lens shaft 11 is 24.5N. Through experiments or simulation calculations, for 65Mn material with a yield strength of 520MPa, the preload value corresponding to a preload of 0.1mm is approximately 60N, 60N / 24.5N = 2.45. When the preload value is 24.5N, the corresponding preload is 0.07mm, and the preload of the corresponding preload adjustment component 4 is too small, making the adjustment error difficult to control. For example, the ratio of the preload value corresponding to the deformation of the preload spring 3 at 0.1 mm to the minimum preload of the single-sided lens shaft 11 is not less than 1 and not greater than 1.5.

[0084] refer to Figure 12 As shown, the measured friction coefficient μ between the lens shaft 11 and the flip bracket 2 is 0.3, the preload F is 26 N, and the radius R of the lens shaft 11 is 3.5 mm. The frictional torque generated by the preload on the rotating mirror 1 is F * R * μ = 26 N * 3.5 mm * 0.3 = 27.3 mN·m. In addition to the frictional torque, the transmission load also includes the rotational torque generated by the deviation of the center of gravity of the rotating mirror 1 assembly from its axis. For example, if the eccentricity c of the rotation axis formed by the center of gravity of the rotating mirror 1 relative to the lens shaft 11 is 6.81 mm, the resulting rotational torque is 6.81 mm * 500 g * 9.8 N / kg = 33.369 mN·m. Therefore, the total load on the rotating mirror mounting structure is 27.3 mN·m + 33.369 mN·m = 60.669 mN·m.

[0085] In one exemplary embodiment of this disclosure, the installation process of the rotating reflector 1 of the head-up display is as follows:

[0086] Assemble the rotating reflector 1 into the flip brackets 2 on both sides. Pre-install the pre-load springs 3 on both sides using the pre-installed clips 21 and spring clip fixing parts 7. Then, assemble the assembled rotating reflector 1, pre-load springs 3, and flip brackets 2 into the head-up display housing and screw in the pre-load adjustment parts 4. After installing the rotating reflector 1, pre-load springs 3, and flip brackets 2, adjust and calibrate the preload on both sides.

[0087] Specifically, a force-measuring point is determined on the rotating reflector 1, and a force gauge 9 is installed, for example, in... Figure 13As shown, the force measuring point is located at the center of the rotating mirror 1 in the horizontal direction (left-right direction) and at the top of the back plate 12 of the mirror, with a distance of 55mm from the axis of the rotating mirror 1. Taking the total load of the rotating mirror mounting structure in the aforementioned embodiment as 60.669mN·m as an example, the force value at the corresponding force measuring point is 60.669mN·m / 55mm = 1.103N. The calibration process is as follows: first, adjust the preload adjusting component 4 on one side so that the load measured by the force gauge 9 is a single-sided load of 1.103N / 2 = 551.536mN, and then adjust the preload adjusting component 4 on the other side so that the load measured by the force gauge 9 is the total load force of 1.103N. This completes the preload adjustment and calibration of the rotating mirror 1. Through the above method, it can be ensured that the preload on both sides meets the requirements and that the preload on both sides is balanced, avoiding image distortion caused by uneven force on the rotating mirror 1. After adjusting the preload adjustment component 4 to the correct position, assemble the reflector transmission system (drive motor 61 and transmission components).

[0088] According to another aspect of this disclosure, a head-up display (HUD) is provided, including a mirror mounting structure for an HUD comprising any of the foregoing exemplary embodiments or possible combinations thereof. For details regarding the operating principle, application scenarios, and structural implementations of the HUD, please refer to the foregoing description and related technologies; further details will not be repeated here.

[0089] This disclosure also provides a method for mounting a reflector to a head-up display, including:

[0090] Step S100: Obtain the load of the rotating reflector 1 of the head-up display;

[0091] Step S200: Obtain the preload spring 3 according to the load of the rotating mirror 1. The preload spring 3 is used to limit the lens rotation axis 11 of the rotating mirror 1 to the flip bracket 2. The preload spring 3 includes a through preload adjustment hole 31. The end face of the preload adjustment hole 31 is provided with a protruding elastic adjustment part 32. The elastic adjustment part 32 is used to deform during the process of the preload adjustment member 4 passing through the preload adjustment hole 31 and pressing the preload spring 3, so as to reduce the protrusion height of the elastic adjustment part 32.

[0092] Step S300: Assemble the pre-compression spring 3, the rotating reflector 1, and the flipping bracket 2;

[0093] Step S400: Determine the force measuring point on the rotating reflector 1, and obtain the ideal load and actual load at the force measuring point;

[0094] Step S500: Adjust the preload adjustment component 4 to make the actual load at the force measuring point equal to the ideal load.

[0095] In step S100, the load on the rotating mirror 1 can be calculated based on the weight of the mirror mounting structure, the coefficient of friction, and the eccentricity c of the center of gravity of the rotating mirror 1 relative to the lens rotation axis 11. The specific calculation process can be referred to the aforementioned exemplary implementation method, and will not be repeated here.

[0096] In step S200, the preload spring 3 is obtained. The structure of the preload spring 3 can be referred to the description of the exemplary embodiment of the aforementioned reflector mounting structure. In some embodiments, the material, thickness, height of the elastic adjustment part 32 protruding from the periphery of the preload adjustment hole 31, and the angle occupied by the elastic adjustment part 32 in the circumferential direction of the preload adjustment hole 31 can be determined according to the weight of the reflector mounting structure and the acceleration requirements of the vehicle's mechanical impact.

[0097] In step S300, the specific process of assembling the pre-compression spring 3, the rotating reflector 1 and the flip bracket 2 can be as follows: assemble the rotating reflector 1 into the flip brackets 2 on both sides, pre-assemble the pre-compression springs 3 on the left and right sides using the pre-installed buckles 21 and the spring fixing parts 7, and then assemble the assembled rotating reflector 1, pre-compression spring 3 and flip bracket 2 assembly onto the housing of the head-up display.

[0098] In step S400, a force measuring point is determined on the rotating reflector 1. For example, refer to... Figure 13 As shown, the force gauge 9 is attached to the center of the rotating mirror 1 in the horizontal direction (left-right direction). The measured force value is the resultant force of the pre-compression springs 3 on both sides on the lens rotation axis 11. For example, the distance between the force gauge 9 attachment point and the axis of the rotating mirror 1 is 55mm, and the force gauge 9 attachment point is located on the upper part of the rotating mirror 1, for example, on the top of the back plate 12 of the mirror.

[0099] In step S500, specifically, when adjusting the preload adjustment components 4 on both sides respectively, the adjustment process can be as follows: first adjust the preload adjustment component 4 on one side so that the actual load measured by the force gauge 9 is equal to the ideal single-sided load, and then adjust the preload adjustment component 4 on the other side so that the actual load measured by the force gauge 9 is equal to the load at the ideal force measuring point.

[0100] Taking the total load of the rotating mirror mounting structure in the aforementioned embodiment as 60.669 mN·m as an example, the force value at the corresponding force measuring point is 60.669 mN·m / 55 mm = 1.103 N. The adjustment process in step S500 can be as follows: first, adjust the preload adjusting component 4 on one side so that the load measured by the force gauge 9 is a single-sided load of 1.103 N / 2 = 551.536 mN, and then adjust the preload adjusting component 4 on the other side so that the load measured by the force gauge 9 is the total load force of 1.103 N, thus completing the preload adjustment and calibration of the rotating mirror 1.

[0101] By using the above-described mirror installation method, it can be ensured that the preload on the lens shaft 11 meets the requirements and that the preload on both sides of the rotating mirror 1 is balanced, thus avoiding image distortion caused by uneven force on the rotating mirror 1. Furthermore, referring to Table 1 above, when the preload of the preload spring 3 changes, for example from 0.1mm to 0.2mm, the preload value changes significantly (from 26N to 51.6N). Adjusting the preload on the lens shaft 11 using the mirror installation method of this disclosure, compared to directly adjusting according to the determined stroke of the preload adjuster 4, avoids the influence of machining and assembly errors on the preload value, reduces abnormal load on the transmission system, and improves product qualification rate and quality stability.

[0102] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0103] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of this disclosure is limited only by the appended claims.

Claims

1. A reflector mounting structure for a head-up display, characterized in that, include: A rotating mirror (1) has a lens rotation axis (11); The flip bracket (2) has a pivot mounting groove for matching the lens pivot (11); A pre-pressure spring (3) is used to cover the opening of the rotating shaft mounting groove to limit the lens rotating shaft (11) within the rotating shaft mounting groove; the pre-pressure spring (3) includes a through pre-pressure adjustment hole (31), and the end face of the pre-pressure adjustment hole (31) is provided with a protruding elastic adjustment part (32). A pre-pressure adjusting member (4) is used to pass through the pre-pressure adjusting hole (31) to fix the pre-pressure spring (3) to the flipping bracket (2); wherein, the elastic adjusting part (32) is used to deform during the process of the pre-pressure adjusting member (4) pressing the pre-pressure spring (3) against the flipping bracket (2) so as to reduce the protrusion height of the elastic adjusting part (32); the included angle α between the elastic adjusting part (32) and the end face of the pre-pressure adjusting hole (31) is 40° to 50°.

2. The reflector mounting structure for a head-up display according to claim 1, characterized in that, The elastic adjustment part (32) extends from the periphery of the pre-pressure adjustment hole (31) toward the axis of the pre-pressure adjustment hole (31), and the height of the elastic adjustment part (32) protruding in the free state when it is not compressed gradually increases from the periphery of the pre-pressure adjustment hole (31) toward the axis of the pre-pressure adjustment hole (31).

3. The reflector mounting structure for a head-up display according to claim 1, characterized in that, The width of the elastic adjustment part (32) gradually decreases from the circumference of the pre-pressure adjustment hole (31) towards the axis of the pre-pressure adjustment hole (31).

4. The reflector mounting structure for a head-up display according to claim 1, characterized in that, The elastic adjustment part (32) has a first side surface (321) and a second side surface (322) extending from the periphery of the pre-pressure adjustment hole (31) toward the axis of the pre-pressure adjustment hole (31). The first side surface (321) is used to contact the pre-pressure adjustment member (4). The first side surface (321) has a curvature coaxial with the axis of the pre-pressure adjustment hole (31).

5. The reflector mounting structure for a head-up display according to claim 4, characterized in that, The first side (321) is inclined toward the direction in which the elastic adjustment part (32) protrudes.

6. The reflector mounting structure for a head-up display according to claim 5, characterized in that, In a direction perpendicular to the periphery of the pre-pressure adjustment hole (31), the orthographic projection of the first side surface (321) is inside the pre-pressure adjustment hole (31); the orthographic projection of the edge of the first side surface (321) furthest from the end face of the pre-pressure adjustment hole (31) coincides with the outer periphery of the pre-pressure adjustment hole (31).

7. The reflector mounting structure for a head-up display according to claim 4, characterized in that, The angle occupied by the elastic adjustment part (32) in the circumferential direction of the pre-pressure adjustment hole (31) is not less than 70° and not more than 100°.

8. The reflector mounting structure for a head-up display according to any one of claims 1 to 7, characterized in that, The preload adjustment hole (31) includes a circular connecting hole and an expansion hole located on the outer periphery of the connecting hole. The expansion hole is connected to the connecting hole, and the connecting hole is used for the preload adjustment member (4) to pass through. The elastic adjustment parts (32) are arranged in pairs on the end face of the pre-pressure adjustment hole (31) around the hole. The two elastic adjustment parts (32) arranged in pairs protrude from the two opposite end faces of the pre-pressure adjustment hole (31) around the hole and are symmetrical with respect to the center of the pre-pressure adjustment hole (31).

9. The reflector mounting structure for a head-up display according to claim 1, characterized in that, The preload spring (3) includes a semi-circular rotating shaft fixing part (33) and connecting parts located on opposite sides of the rotating shaft fixing part (33). The preload adjustment hole (31) and the elastic adjustment part (32) are provided in the connecting part. The rotating shaft fixing part (33) is used to cover the opening of the rotating shaft mounting groove. The rotating shaft fixing part (33) includes a pressure plate (34). The pressure plate (34) protrudes into the inside of the rotating shaft fixing part (33). The pressure plate (34) is used to contact the lens rotating shaft (11) to limit the lens rotating shaft (11) within the rotating shaft mounting groove.

10. A heads-up display, characterized in that, The reflector mounting structure of the head-up display according to any one of claims 1 to 9.

11. A method for mounting a reflector on a head-up display, characterized in that, include: Obtain the load of the rotating reflector (1) of the head-up display; According to the load of the rotating mirror (1), a preload spring (3) is obtained. The preload spring (3) is used to limit the lens rotation axis (11) of the rotating mirror (1) to the flip bracket (2). The preload spring (3) includes a through preload adjustment hole (31). The end face of the preload adjustment hole (31) is provided with a protruding elastic adjustment part (32). The elastic adjustment part (32) is used to deform during the process of the preload adjustment member (4) passing through the preload adjustment hole (31) and pressing the preload spring (3) so as to reduce the protrusion height of the elastic adjustment part (32). Assemble the pre-compression spring (3), the rotating reflector (1), and the flipping bracket (2); Determine the force measuring point on the rotating reflector (1) and obtain the ideal load and actual load at the force measuring point; Adjust the preload adjustment component (4) so ​​that the actual load at the force measuring point is equal to the ideal load.

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