CN116560086B

CN116560086B - Head-up display and calibration method thereof

Info

Publication number: CN116560086B
Application number: CN202310331324.2A
Authority: CN
Inventors: 张涛; 张发军; 张宁波
Original assignee: Jiangsu Zejing Automobile Electronic Co ltd
Current assignee: Jiangsu Zejing Automobile Electronic Co ltd
Priority date: 2023-03-30
Filing date: 2023-03-30
Publication date: 2024-02-09
Anticipated expiration: 2043-03-30
Also published as: CN116560086A

Abstract

The disclosure relates to a head-up display and a calibration method of the head-up display, and relates to the technical field of head-up display. The head-up display comprises a shell, a main reflector, a reflector transmission system and a calibration device. The main reflector is arranged in the shell and is rotatably arranged relative to the shell. The main reflector has at least one dormant position and one working position relative to the housing, and the main reflector can be rotatably switched between the dormant position and the working position. The calibration device comprises a calibration pointer and a dial, wherein the calibration pointer is arranged on the main reflector and rotates relative to the shell along with the rotation of the main reflector; the dial is fixedly connected with the shell. The dial comprises at least one dormant scale and at least one working scale, and when the main reflector is positioned at the dormant position, the calibration pointer corresponds to one dormant scale; when the main reflector rotates to the working position relative to the shell, the calibration pointer corresponds to a working scale.

Description

Head-up display and calibration method thereof

Technical Field

The disclosure relates to the technical field of head-up display, in particular to a head-up display and a calibration method of the head-up display.

Background

The basic working process of a vehicle Head Up Display (HUD) is to reflect light generated by an optical machine module onto a windshield glass through a reflector in the Head Up Display, and then reflect the light to human eyes for imaging in front of a vehicle. To accommodate the different positions of the eye-box of the observer, vehicle head-up displays are often provided with a mirror drive system which can adjust the angle of the mirror.

Mirror drive systems typically have relatively complex drive trains that require calibration in order to ensure that the mirror drive system is able to accurately adjust the angle of the mirror so that the actual optical path coincides with the designed optical path.

In the prior art, the head-up display needs to be installed on a test bench after being assembled, and an optical machine module is started to confirm whether the actually projected image coincides with the position of the theoretical image. The method needs to test the head-up display after the head-up display is assembled, is very complicated, can only judge the direction of the error of the transmission system, cannot detect the error of the transmission system, and is not beneficial to quickly calibrating the transmission system.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

An object of the present disclosure is to provide a head-up display and a calibration method of the head-up display, which can be used for calibrating errors of a transmission system of the head-up display.

According to a first aspect of the present disclosure, there is provided a head-up display comprising:

a housing;

the main reflector is arranged in the shell and can be rotatably arranged relative to the shell, so that the main reflector at least has a dormant position and a working position relative to the shell;

the reflector transmission system comprises a driving motor and a transmission assembly, wherein the driving motor is arranged in the shell, and the transmission assembly is in transmission connection between the main reflector and the driving motor;

the calibration device comprises a calibration pointer and a dial, wherein the calibration pointer is arranged on the main reflector, the dial is fixedly connected with the shell, and the dial comprises at least one dormant scale and at least one working scale;

when the main reflector is positioned at the dormant position, the calibration pointer corresponds to one dormant scale; when the main reflector rotates to the working position relative to the shell, the calibration pointer corresponds to a working scale.

In an exemplary embodiment of the present disclosure, the inner wall of the housing includes a bottom wall and a side wall surrounding the bottom wall, and a rotating bracket is fixedly connected to the side wall;

The main reflector comprises a reflector body and a rotating shaft, one side of the reflector body is a reflecting surface, and the rotating shaft is arranged on one side of the reflector body adjacent to the reflecting surface and extends towards a direction away from the reflector body; the rotating shaft is hinged to the rotating bracket, so that the reflecting surface is rotatably arranged relative to the shell around the rotating shaft;

the dial is arranged on one side of the rotating support, which is close to the mirror body.

In an exemplary embodiment of the disclosure, the rotating bracket is provided with a mounting hole, the rotating shaft sequentially comprises a transition section and a connecting section along the direction away from the mirror body, the connecting section stretches into the mounting hole, and the opposite ends of the transition section are respectively connected with the mirror body and the connecting section; wherein, the calibration pointer is located on the outer peripheral face of changeover portion.

In one exemplary embodiment of the present disclosure, the calibration pointer is disposed on a side of the mirror body adjacent to the reflective surface.

In one exemplary embodiment of the present disclosure, the dial is provided on the sidewall.

In an exemplary embodiment of the present disclosure, an indicator plate extending in a direction away from the mirror body is provided on a side of the mirror body adjacent to the dial plate and adjacent to the reflecting surface, and the calibration pointer is provided on the indicator plate.

In an exemplary embodiment of the present disclosure, the working position includes at least an upper eye box position and a lower eye box position, the working scale includes at least an upper eye box scale and a lower eye box scale, the dial further includes a plurality of auxiliary scales, and the plurality of auxiliary scales are uniformly distributed between the upper eye box scale and the lower eye box scale;

The angle of the upper eye box scale along the rotating direction of the main reflector, the angle of the lower eye box scale along the rotating direction of the main reflector, the angle of the auxiliary scale along the rotating direction of the main reflector and the included angle between any two adjacent auxiliary scales are equal.

In one exemplary embodiment of the present disclosure, a drive assembly includes a timing gear, a worm, an internal gear, and a drive seat;

the driving motor is fixed on the bottom wall, an output shaft of the driving motor is coaxial with the speed regulating gear, the internal gear is arranged at one end of the worm close to the speed regulating gear and is coaxial with the worm, and the speed regulating gear is internally and externally meshed with the internal gear in the internal gear; the transmission seat is fixedly connected with the mirror body, and one side of the transmission seat, which is far away from the mirror body, is provided with a worm wheel surface meshed with the worm.

In one exemplary embodiment of the present disclosure,

the working positions comprise an upper eye box position, a middle eye box position and a lower eye box position,

the working scale comprises an upper eye box scale, a middle eye box scale and a lower eye box scale,

when the main reflector rotates to the upper eye box position relative to the shell, the calibration pointer corresponds to the upper eye box scale;

when the main reflector rotates to the middle eye box position relative to the shell, the calibration pointer corresponds to the middle eye box scale;

When the main reflector rotates to the lower eye box position relative to the shell, the calibration pointer corresponds to the lower eye box scale.

According to a second aspect of the present disclosure, there is provided a calibration method of a head-up display including a housing, a main mirror, a mirror drive system, and a calibration device, the calibration method of the head-up display including:

setting a calibration device according to the design position of the main reflector, wherein the calibration device comprises a calibration pointer and a dial, the calibration pointer is arranged on the main reflector, the dial is fixedly connected with the shell, and the dial comprises at least one dormancy scale and at least one working scale;

assembling the head-up display to enable the calibration pointer to correspond to the dormancy scale;

the reflector transmission system drives the main reflector to rotate relative to the shell;

calculating a transmission error of the reflector transmission system according to the relation between the actual position of the calibration pointer pointing to the dial and the working scale;

and adjusting the transmission ratio of the transmission system of the reflecting mirror according to the transmission error.

According to the head-up display and the calibration method of the head-up display, the reflector transmission system can be calibrated, and only the main reflector, the reflector transmission system and the shell are required to be assembled during calibration; the calibration pointer corresponds to one dormant scale, and then the main reflector is driven to turn to a certain working position from the dormant position corresponding to the dormant scale according to the designed transmission ratio of the reflector transmission system, and the included angle between the actual pointed position of the calibration pointer and the working scale corresponding to the working position is compared, so that the direction of the transmission error of the reflector transmission system can be obtained, and the transmission error of the reflector transmission system can be calculated. By adjusting the dimensional parameters of the parts on the transmission chain, the calibration of the mirror transmission system can be realized. Moreover, when the head-up display of the embodiment of the disclosure is calibrated, the head-up display can be assembled completely without matching other structures such as an optical machine module and a secondary reflector and a rack for confirming the projection condition of the head-up display, so that the difficulty in calibrating the head-up display is reduced, and the efficiency in calibrating the head-up display is improved. In addition, because the calibration pointer is located main speculum, calibrated scale and casing fixed connection, the deviation of reading through calibrating device only receives the influence of speculum transmission system, consequently this new line display of this embodiment can realize alone calibrating speculum transmission system, and the pertinence of calibration is stronger, and the degree of accuracy of calibration also can be higher.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views. Wherein:

FIG. 1 illustrates a partial schematic diagram of a heads-up display according to an exemplary embodiment of the present disclosure;

FIG. 2 shows an enlarged view of a part of the structure of FIG. 1;

FIG. 3 illustrates a partial schematic diagram of a head-up display according to an exemplary embodiment of the present disclosure;

FIG. 4 shows an enlarged view of a part of the structure of FIG. 3;

FIG. 5 illustrates a schematic view of a rotating mount of a head-up display according to an exemplary embodiment of the present disclosure;

FIG. 6 shows an enlarged view of the partial structure of FIG. 5;

FIG. 7 illustrates a schematic diagram of a primary mirror of a heads-up display according to an exemplary embodiment of the present disclosure;

FIG. 8 shows an enlarged view of the partial structure of FIG. 7;

FIG. 9 illustrates a schematic diagram of a housing and dial of a heads-up display according to an exemplary embodiment of the present disclosure;

FIG. 10 shows an enlarged view of the partial structure of FIG. 9;

FIG. 11 illustrates a schematic diagram of a primary mirror of a heads-up display according to an exemplary embodiment of the present disclosure;

FIG. 12 shows an enlarged view of the partial structure of FIG. 11;

FIG. 13 illustrates a schematic diagram of a sleep position and an operational position of a primary mirror of a heads-up display according to an exemplary embodiment of the present disclosure;

FIG. 14 illustrates a partial schematic diagram of a heads-up display according to an exemplary embodiment of the present disclosure;

FIG. 15 illustrates a schematic diagram of a mirror drive system of a heads-up display according to an exemplary embodiment of the present disclosure;

Fig. 16 shows a flowchart of a method of calibrating a heads-up display according to an exemplary embodiment of the present disclosure.

The reference numerals are explained as follows:

10. a housing; 20. a primary mirror; 21. a mirror body; 211. a reflecting surface; 22. a rotating shaft; 221. a transition section; 222. a connection section; 31. calibrating a pointer; 32. a dial; 321. sleep scales; 322. an upper eye box scale; 323. a middle eye box scale; 324. a lower eye box scale; 325. an auxiliary scale;

41. a driving motor; 42. a speed regulating gear; 43. a worm; 44. an internal gear; 45. a transmission seat; 46. a motor bracket; 461. an elastic member; 50. rotating the bracket; 51. a mounting hole;

101. a dormant position; 102. an upper eye box position; 103. a mid-eye box position; 104. lower eye box position.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be more fully described below with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is therefore to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

Unless specified or indicated otherwise, the terms "coupled," "fixed," and the like are to be construed broadly and are, for example, capable of being coupled either permanently or detachably, or integrally; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in the present disclosure may be understood by those skilled in the art according to the specific circumstances. The terms "a," "an," "the," and "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc.

Further, the terms of "upper", "lower", "inner", "outer", and the like, described in the exemplary embodiments of the present disclosure, are merely for convenience, and are described according to the position and state of the head-up display when actually operated, or according to the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. Those skilled in the art will appreciate that after rotating the structure in the exemplary embodiments of the present disclosure or changing the direction and viewing angle of the view, "up" may also become "down" or "left" or "right", which does not obstruct the understanding of those skilled in the art. The "scale" in the present disclosure may be in the form of a scale line or a scale point, and the "calibration pointer" corresponds to the "scale" and means that the vertex of the head of the calibration pointer coincides with the scale line or the scale point, and the overlapping manner may be determined by naked eyes or by other optical manners.

To facilitate understanding of the technical solutions of the present disclosure, an exemplary description is first given of a head-up display in the prior art:

in the field of vehicle-mounted head-up display, a windshield type head-up display is generally adopted, the windshield type head-up display can be installed on the lower side of an automobile instrument panel, a driver can see the information of the whole automobile through windshield glass by the optical mirror reflection principle, and the driving safety is improved.

The heads-up display may generally include a housing, an opto-mechanical module, a mirror assembly, and a dust cover plate. The shell can include drain pan and upper cover, and the upper cover lock is on the drain pan, and the outside shape of upper cover and drain pan can be according to the arrangement space of whole car and decide, and dustproof apron lock is at the top of upper cover to at the inside accommodation space that forms of upper cover and drain pan, the optics and the integrated circuit of new line display all can hold in this accommodation space.

The optical-mechanical module is installed at the bottom of the shell and can comprise a TFT-LCD (Thin Film Transistor Liquid Crystal Display ), or a liquid crystal on silicon (Liquid Crystal on Silicon, LCoS) projector or an LED-based DLP (Digital Light Processing ) projection display technology can be adopted as an image source of the head-up display. The reflecting mirror group can comprise a plurality of convex reflecting mirrors, concave reflecting mirrors or plane reflecting mirrors, the reflecting mirrors of the reflecting mirror group are arranged at a certain angle, image light emitted by the optical machine module enters the reflecting mirror group and is emitted to windshield glass from the transparent dustproof cover plate through the reflecting mirror group, and then reflected to human eyes, so that a driver and passengers can observe virtual images on the windshield glass.

In a head-up display, a mirror group comprises a main mirror and a sub-mirror, wherein the reflecting surface of the main mirror is a concave surface, the reflecting surface of the sub-mirror is a plane, and the main mirror and the sub-mirror are oppositely arranged in a head-up display shell. The image light emitted by the optical machine module firstly enters the auxiliary reflector, is reflected to the main reflector through the auxiliary reflector, so that the image light is divergent, the image is enlarged, and then is reflected to the outside of the head-up display through the main reflector, and forms a virtual image in the range of the eye boxes of drivers and passengers.

The range of observation may be different due to the difference in height and posture of the driver. To adjust the clarity of imaging, the primary mirror may be rotated to place the primary mirror in different operative positions depending on the position of the viewer's eye box to change the optical path of the imaging to image within the corresponding eye box. In addition, because of the reversibility of the light path, in order to avoid that the stray light outside the head-up display enters the head-up display along the light path of the emergent light of the head-up display, the optical device in the optical device module is damaged, and when the head-up display is in a non-working mode, the main reflector can be rotated to a dormant position, for example, the main reflector is rotated to a nearly vertical angle, so that the light path inside the head-up display is changed. When the head-up display is in the working mode, the main reflector is rotated to the corresponding working position.

In order to drive the main reflector to rotate relative to the shell, a reflector transmission system is usually arranged in the head-up display, and the position of the main reflector can be switched between different working positions and dormant positions through transmission modes such as a worm gear, a screw nut, a linear push rod motor, a gear rack and the like. Because the transmission chain of the reflector transmission system is complex, in order to ensure that the reflector transmission system can accurately adjust the angle of the main reflector, the main reflector is switched between a designed working position and a dormancy position, an actual light path is consistent with a designed light path, and the reflector transmission system needs to be calibrated.

In a calibration process of the related art, the above-mentioned structural components such as the housing, the optical-mechanical module, the mirror group, the dust-proof cover plate, etc. need to be assembled into a whole, and then the assembled head-up display is mounted on the test stand and started. A theoretical image area is arranged on the test bed in advance according to the projection position designed by the head-up display, and whether the actual projection is positioned in the theoretical image area or not is compared by driving the main reflector to rotate, so that whether an error exists in the head-up display or not can be judged.

If the actual projection deviates from the theoretical image area, the error existing in the head-up display can be known, but the direction of the error in the head-up display can be obtained only according to the direction of the image deviation, and the size of the error cannot be detected. Moreover, because the head-up display can be tested after being assembled, when each link of the reflector transmission system is adjusted to calibrate the head-up display, the head-up display is required to be disassembled, internal structural members are adjusted, the assembly test is performed again, and the calibration process of the head-up display is complicated and the efficiency is low. In addition, since the test is performed after the head-up display is assembled, deviations of all parts inside the head-up display may cause the actual imaging position to be inconsistent with the theoretical image area. When it is desired to calibrate the error of the drive train of the mirror drive train, failure to accurately correlate the deviation of the imaging position with the error of the drive train may result in erroneous calibration of the drive train of the mirror drive train, or insufficient calibration accuracy, etc.

In view of the above problems, embodiments of the present disclosure provide a head-up display, as shown in fig. 1 to 3, which includes a housing 10, a main mirror 20, a mirror driving system and a calibration device. The main mirror 20 is disposed in the housing 10 and rotatably disposed with respect to the housing 10. The main mirror 20 has at least one resting position 101 and one operating position relative to the housing 10, the main mirror 20 being rotatably switchable between the resting position 101 and the operating position. The mirror transmission system comprises a driving motor 41 and a transmission assembly, wherein the driving motor 41 is arranged in the shell 10, and the transmission assembly is in transmission connection between the main mirror 20 and the driving motor 41, so that the driving motor 41 can drive the main mirror 20 to rotate relative to the shell 10 through the transmission assembly. The calibration device comprises a calibration pointer 31 and a dial 32, wherein the calibration pointer 31 is arranged on the main reflector 20 and rotates along with the rotation of the main reflector 20, and the calibration pointer 31 also rotates relative to the shell 10; the dial 32 is fixedly connected to the housing 10. The dial 32 comprises at least one dormant scale 321 and at least one working scale, and when the main mirror 20 is positioned at the dormant position 101, the calibration pointer 31 corresponds to one dormant scale 321; when the main mirror 20 is rotated to the working position with respect to the housing 10, the calibration pointer 31 corresponds to one working scale.

In calibrating the mirror drive system of the head-up display of the embodiments of the present disclosure, only the main mirror 20, the mirror drive system, and the housing 10 need be assembled; the calibration pointer 31 corresponds to one dormant scale 321, and then the main reflector 20 is driven to turn to a certain working position from the dormant position 101 corresponding to the dormant scale 321 according to the designed transmission ratio of the reflector transmission system, and the included angle between the actual pointed position of the calibration pointer 31 and the working scale corresponding to the working position is compared, so that the direction of the transmission error of the reflector transmission system can be obtained, and the transmission error of the reflector transmission system can be calculated. By analyzing the reasons for the generation of the motion errors and adjusting the size parameters of all parts on the transmission chain, the mirror transmission system can be calibrated, so that the actual transmission ratio of the mirror transmission system is consistent with the designed transmission ratio. Moreover, when the head-up display of the embodiment of the disclosure is calibrated, the head-up display can be assembled completely without matching other structures such as an optical machine module and a secondary reflector and a rack for confirming the projection condition of the head-up display, so that the difficulty in calibrating the head-up display is reduced, and the efficiency in calibrating the head-up display is improved. In addition, because the calibration pointer 31 is arranged on the main reflector 20, the dial 32 is fixedly connected with the shell 10, and the deviation read by the calibration device is only influenced by the reflector transmission system, the head-up display of the embodiment of the disclosure can realize the independent calibration of the reflector transmission system, the calibration pertinence is stronger, and the calibration accuracy can be higher.

It should be noted that, the head-up display according to the embodiments of the present disclosure may further include the foregoing optical engine module, the dustproof cover plate, the secondary reflector, and other components, and the housing 10 of the head-up display may include a bottom shell and an upper cover, where the upper cover is fastened to the bottom shell, and the dustproof cover plate is fastened to the top of the upper cover. The optical machine module is arranged at the bottom of the bottom shell, for example, a TFT-LCD can be used as an image source of the head-up display, the backlight source is an LED light source, and light rays emitted by the LED light source sequentially pass through the collimating lens and the fly-eye lens and then reach the LCD screen, are reflected onto windshield glass through the auxiliary reflector and the main reflector 20, and are reflected into human eyes. Of course, the optical engine module may also adopt other projection technologies as described above, and the structure of the head-up display in the embodiment of the present disclosure is not mentioned or specifically defined, and reference may be made to the structure of the head-up display given above, or an embodiment in a conventional technology may be adopted, so long as the function of the head-up display can be achieved.

Specifically, in an exemplary embodiment of the present disclosure, referring to fig. 1, an inner wall of a housing 10 of a head-up display includes a bottom wall and a side wall surrounding the bottom wall, and the bottom wall is provided with a light outlet, and a light engine module may be mounted on the light outlet. A rotating bracket 50 is also fixedly connected to the side wall of the housing 10. In some embodiments, the housing 10 of the head-up display includes a bottom shell and an upper cover, the bottom wall is disposed on an inner wall of a lower portion of the bottom shell, the side wall is formed by the inner wall of the bottom shell surrounding the bottom wall and the inner wall of the upper cover together, and the rotating bracket 50 may be fixed to the bottom shell by bolts or pins. In other embodiments, the rotating bracket 50 may be fixed to the inner wall of the upper cover.

Referring to fig. 3, the main mirror 20 includes a mirror body 21 and a rotating shaft 22, wherein one side of the mirror body 21 is a reflecting surface 211, and the rotating shaft 22 is disposed on one side of the mirror body 21 adjacent to the reflecting surface 211 and extends in a direction away from the mirror body 21. The main mirror 20 is hinged to the rotating bracket 50 through a rotating shaft 22, so that the mirror body 21 can rotate relative to the housing 10 around the rotating shaft 22, and the rotation axis of the reflecting surface 211 of the main mirror 20 is also the axis of the rotating shaft 22. The mirror body 21 of the main mirror 20 may be made of a plastic material or a glass material, and the rotation shaft 22 may be made of the same material as the mirror body 21 or a different material, for example, a plastic material or a metal material. In one embodiment, the mirror body 21 and the rotating shaft 22 are integrally formed of a plastic material such as polycarbonate or polypropylene, so that the main mirror 20 has a lighter weight and a higher precision of matching with the rotating bracket 50.

In an exemplary embodiment of the present disclosure, referring to fig. 3 to 4, the dial 32 is provided on the rotating bracket 50, and further, the dial 32 may be provided on a side of the rotating bracket 50 near the mirror 21, so as to read the corresponding condition of the calibration pointer 31 and the sleep scale 321 or the working scale on the dial 32. Specifically, referring to fig. 5 to 6, the rotating bracket 50 is provided with a mounting hole 51, the mounting hole 51 may be perpendicular to a side surface of the rotating bracket 50 near the mirror body 21, and the rotation shaft 22 of the main mirror 20 extends into the mounting hole 51. The calibration pointer 31 may be provided on the mirror body 21 or on the rotation shaft 22.

For example, in one embodiment, the calibration pointer 31 may be disposed on a side of the mirror body 21 adjacent to the reflecting surface 211, and in particular, the calibration pointer 31 may be a separate component and fixed to the mirror body 21 by a screw or adhered to the mirror body 21. The alignment pointer 31 may also be a protrusion or groove, score, or the like, located on the side of the mirror body 21 adjacent the reflective surface 211. In an embodiment, the calibration pointer 31 may be integrally formed with the mirror body 21, for example, the mirror body 21 is an injection molded part, and when the mirror body 21 is formed by injection molding, the calibration pointer 31 and the mirror body 21 may be directly injection molded at the same time, so that the process is simpler. Alternatively, the calibration pointer 31 may be disposed on the opposite side of the mirror body 21 from the reflecting surface 211, i.e., the back side of the reflecting surface 211, and since the back side of the reflecting surface 211 of the mirror body 21 is generally a non-optical surface, the calibration pointer 31 may be disposed on the back side of the reflecting surface 211 and in close proximity to the rotating bracket 50 provided with the dial 32 without affecting the optical performance of the main mirror 20.

For another example, in one embodiment, referring to fig. 7 to 8, fig. 8 is a partial enlarged view of fig. 7, and the rotating shaft 22 sequentially includes a transition section 221 and a connection section 222 along a direction away from the mirror body 21; the connecting section 222 extends into the mounting hole 51, the opposite ends of the transition section 221 are respectively connected with the lens body 21 and the connecting section 222, and the calibration pointer 31 is arranged on the outer peripheral surface of the transition section 221. The diameter of the transition section 221 may be larger than that of the connection section 222, when the main reflector 20 and the rotating bracket 50 are assembled, the end surface at the junction of the transition section 221 and the connection section 222 abuts against the side surface of the rotating bracket 50, which is close to the reflector body 21, so that the positioning of the main reflector 20 when the main reflector 20 is mounted on the rotating bracket 50 is facilitated, and the transition section 221 is located between the rotating bracket 50 and the main reflector 20 in the axial direction of the rotating shaft 22.

In some embodiments, referring to fig. 5-6, where fig. 6 is a close-up view of fig. 5, the mounting hole 51 may be a circular hole and the dial 32 may be disposed around the mounting hole 51 on a side of the rotating bracket 50 adjacent to the mirror body 21. The graduations on the dial 32 are in the form of graduation marks, and the graduation marks all point to the axis of the mounting hole 51, so that the numerical value of the angle can be accurately read. In other embodiments, the mounting hole 51 may be a square hole, the mounting hole 51 may be a groove structure having an opening in the circumferential direction, or may have another cross section, so long as it can be hinged to the rotation shaft 22 of the main mirror 20. The dial 32 is disposed around the mounting hole 51 on the side of the rotating bracket 50 near the mirror body 21, and may be an axis of rotation of the dial 32 around the mounting hole 51 and the rotating shaft 22 of the main mirror 20 on the side of the rotating bracket 50 near the mirror body 21, and the scale line is also directed to the axis. To distinguish between the specific sleep position 101 and the working position represented by different graduation marks, corresponding graduation marks may be made near the graduation marks, for example, in some drawings of the embodiments of the present disclosure, "P", "L", "M" and "U" in the drawings are graduation marks, and the sleep graduation 321 is marked with "P"; the "L" marks the lower eye box scale 324; eye box scale 323 in the "M" mark; the "U" marks the eye box scale 322.

The dial 32 is disposed on the rotating bracket 50, specifically, the dial 32 may be an independent part, and is disposed on the rotating bracket 50 or adhered to the rotating bracket 50 through a connecting piece such as a bolt, a pin, etc.; dial 32 may also be a protrusion or groove, score, or the like provided on rotating bracket 50. In one embodiment, the dial 32 may also be integrally formed with the rotating bracket 50, for example, the rotating bracket 50 may be an injection molded part, and an injection mold may be designed according to the design working position of the main reflector 20 when the rotating bracket 50 is formed by injection molding, and the dial 32 and the rotating bracket 50 may be injection molded at the same time.

It should be noted that the main mirror 20 is hinged to the rotating support 50 through the rotating shaft 22, so that the mirror body 21 can rotate relative to the housing 10 around the rotating shaft 22, either one side of the main mirror 20 is hinged to the rotating support 50, or two opposite ends of the mirror body 21 are respectively provided with the rotating shafts 22 and are respectively hinged to two rotating supports 50 arranged on two opposite side walls of the housing 10. The calibration pointer 31 and the dial 32 may be provided on the rotation shaft 22 on either side and the rotation bracket 50 hinged thereto, respectively, in the manner as in the previous embodiment; two sets of calibration devices can be respectively arranged at two ends of the main reflector 20, namely a set of calibration pointer 31 and dial 32 are respectively arranged on the rotating shaft 22 at one side and the rotating bracket 50 hinged with the rotating shaft 22; the other group of calibration pointer 31 and dial 32 are respectively arranged on the rotating shaft 22 at the other side of the mirror body 21 and the rotating bracket 50 hinged with the rotating shaft 22. In calibrating the mirror drive system, the difference between the results of the two calibration sets can be compared to detect if the axis of the primary mirror 20 is offset or if improper engagement occurs in the mirror drive system.

In an exemplary embodiment of the present disclosure, the dial 32 may also be provided on the side wall of the housing 10. For example, referring to fig. 9 and 10, fig. 10 is a partial enlarged view of fig. 9, the dial 32 may be provided on a side wall provided with the rotating bracket 50, and other more space inside the housing 10 may be utilized in combination with the embodiment in which the calibration pointer 31 is provided on the mirror body 21. In one embodiment, referring to fig. 2, 11 and 12, the mirror body 21 is provided with an indication plate extending in a direction away from the mirror body 21 on a side adjacent to the reflecting surface 211 near the dial 32, and the calibration pointer 31 is provided on the indication plate. Specifically, the surface of the indicator plate provided with the calibration pointer 31 may be coplanar with the reflecting surface 211, so that the calibration pointer 31 may more accurately reflect the angle condition of the reflecting surface 211, and at the same time, may not affect the optical performance of the reflecting surface 211. Furthermore, in some embodiments, the primary mirror 20 may not be rotatably coupled to the housing 10 by the rotation bracket 50, but may be directly coupled to a side wall of the housing 10. The side wall of the housing 10 is provided with a structure similar to the aforementioned mounting hole 51, so that the aforementioned rotating bracket 50 can be replaced, and the number of parts of the head-up display can be reduced.

The eyebox area is an important display parameter of the head-up display that defines the effective area of an eyepoint, which is the eyebox area. The eyebox area has a range of tolerance bands such that when the observer's eyepoint position moves within the range of the eyebox area and tolerance bands, the observer can see a clear virtual image on the windshield that meets the requirements. In an exemplary embodiment of the present disclosure, referring to fig. 13, the primary mirror 20 has a resting position 101 and three operating positions relative to the housing 10, an upper eye-box position 102, a middle eye-box position 103, and a lower eye-box position 104, respectively.

Referring to fig. 13, the direction of the head up display when mounted on the whole vehicle is taken as a reference, the bottom of the bottom shell of the head up display is taken as a lower side, and the dust cover plate of the head up display is taken as an upper side. When the main reflector 20 is positioned at the upper eye box position 102, the included angle between the main reflector 20 and the horizontal plane is larger, and the virtual image of the head-up display at the position of the eye box is correspondingly formed; when the main reflector 20 is positioned at the lower eye box position 104, the included angle between the main reflector 20 and the horizontal plane is smaller, and the virtual image of the head-up display on the upper eye box position corresponds to the virtual image; when the primary mirror 20 is positioned at the intermediate box position 103, the primary mirror 20 is angled with respect to the horizontal between the upper box position 102 and the lower box position 104, and the virtual image of the corresponding heads-up display at the box is also positioned between the two cases. When the main reflector 20 is at the dormant position 101, the included angle between the main reflector 20 and the horizontal plane is the largest, which is larger than the included angle between the main reflector 20 and the horizontal plane when the main reflector 20 is at the upper eye box position 102, so that external parasitic light can be prevented from entering the head-up display along the light path of the emergent light of the head-up display, and damage is caused to optical devices in the photo-engine module. Of course, the main reflector 20 may have only one working position, or only two working positions of the upper eye box position 102 and the lower eye box position 104, or more working positions, and specific parameters of the working positions may be determined according to design parameters of the head-up display; the primary mirror 20 may also have more than one dormant position 101, not specifically defined herein.

Referring to fig. 6, the scale plate 32 may have three working scales, which are an upper eye box scale 322, a middle eye box scale 323, and a lower eye box scale 324, respectively, corresponding to the three working positions of the main mirror 20. When the main mirror 20 is rotated relative to the housing 10 to the upper eye box position 102, the alignment pointer 31 corresponds to the upper eye box scale 322; when the main mirror 20 rotates to the middle eye box position 103 relative to the housing 10, the alignment pointer 31 corresponds to the middle eye box scale 323; when the primary mirror 20 is rotated relative to the housing 10 to the lower eye box position 104, the alignment pointer 31 corresponds to the lower eye box scale 324. Depending on the sleeping position 101 or positions 101 of the main mirror 20, the scale 32 may also have a corresponding sleeping scale 321 or a plurality of sleeping scales 321 corresponding to the sleeping positions 101 one by one. The working scales of the dial 32 may be set in one-to-one correspondence with the working positions of the main mirror 20, so that when the mirror transmission system is calibrated, calibration may be performed at any working position, calibration may be performed at a plurality of working positions, and the calibration results may be checked mutually, thereby achieving a more accurate calibration effect.

In an exemplary embodiment of the present disclosure, referring to fig. 6, the dial 32 is further provided with a plurality of sets of auxiliary scales 325 uniformly distributed in the circumferential direction between each working scale and each dormant scale 321, and the auxiliary scales 325 are also directed to the axis of relative rotation between the mounting hole 51 and the rotating shaft 22 of the main mirror 20, for performing specific readings on the angle difference between the position at which the calibration pointer 31 is actually directed and the working position at which the calibration pointer 31 is directed under the theoretical condition. The number of auxiliary graduations 325 can be determined based on the angular difference between the working graduations and the specific requirements for calibration accuracy.

For example, referring to fig. 3 to 6, the main mirror 20 has a resting position 101 and an upper eye box position 102, and a middle eye box position 103 and a lower eye box position 104, which are three working positions corresponding to the resting scale 321, the upper eye box scale 322, the middle eye box scale 323 and the lower eye box scale 324 of the dial 32, respectively, and the included angle between the middle eye box scale 323 and the upper eye box scale 322 and the included angle between the middle eye box scale 323 and the lower eye box scale 324 are equal. The angle between the sleep scale 321 and the upper eye box scale 322 is relatively large compared with the angle between the upper eye box scale 322 and the lower eye box scale 324. Auxiliary scales 325 are arranged on two sides of each working scale so as to be convenient for reading the deviation value of the angle of the main reflector 20; auxiliary scales 325 may also be provided on either side of the sleep scale 321 to calibrate the mirror drive system when the primary mirror 20 is rotated from the operational position back to the sleep position 101.

In one embodiment, the auxiliary scale 325 between the upper eye box scale 322 and the sleep scale 321 may be disposed only within a certain angle range of the side of the sleep scale 321 near the upper eye box scale 322 and a certain angle range of the side of the upper eye box scale 322 near the sleep scale 321, instead of being uniformly disposed within the entire angle range between the upper eye box scale 322 and the sleep scale 321. The angular range of the auxiliary scale 325 may cover the transmission error of the mirror transmission system under normal conditions; in the case where the calibration pointer 31 is not within the readable range of the auxiliary scale 325, it is considered that an error occurs in the calibration process or a malfunction occurs in a component, and the calibration is performed after the cause is checked. Since the internal space of the head-up display is limited, especially when the dial 32 and the calibration pointer 31 are respectively disposed at the transition section 221 of the rotating bracket 50 and the rotating shaft 22, in order to ensure that the length dimension of the housing 10 and the main reflector 20 in the axial direction of the rotating shaft 22 is not affected, the length of the transition section 221 cannot be too long, which may cause difficulty in reading of the calibration device. By matching the angle range of the auxiliary scale 325 with the error range of the transmission ratio, the calibration process of the calibration device to the transmission system of the reflector can be more targeted, the reading difficulty is reduced, and the calibration efficiency and accuracy are improved.

Further, in an exemplary embodiment of the present disclosure, referring to fig. 6, the auxiliary graduations 325 between two adjacent working graduations are uniformly distributed, for example, a plurality of auxiliary graduations 325 are uniformly distributed between the upper and middle eye-box graduations 322 and 323. The included angle between any two adjacent auxiliary graduations 325, the included angle between the upper eye box graduation 322 and the adjacent auxiliary graduation 325, and the included angle between the middle eye box graduation 323 and the adjacent auxiliary graduation 325 are all equal, namely the minimum angles among the graduations are all equal; and the angle is also equal to the angles of the upper eye box scale 322, the middle eye box scale 323, and the auxiliary scale 325 themselves in the rotational direction of the main mirror 20. Specifically, the scales of the dial 32 may all take the form of scale marks, and since the scale marks point to the axis of rotation of the main reflector 20 and necessarily occupy a certain space volume in actual production, the angle of the scale marks along the rotation direction of the main reflector 20 actually refers to the maximum value of the included angle between two geometric points on the scale marks and the connecting line of the rotating shaft 22. Of course, the same applies when the scale is in the form of scale points, and the angle of a scale along the rotation direction of the main mirror 20 also refers to the maximum value of the included angle between two geometric points on the scale points and the connecting line of the rotating shaft 22. The included angle between the scales means the minimum value of the included angle between the two geometric points located on the two scale lines or scale points and the connecting line of the rotating shaft 22.

Furthermore, in some embodiments, when the calibration pointer 31 is not pointing exactly to a scale, it is necessary to estimate its position. The angle of the scales is equal to the angle range of the tolerance zone of the eye box area projected by the head-up display under any working position of the main reflector 20. Specifically, for example, in any working position of the head-up display, the maximum allowable angle of deviation of the central eye point of the projected eye box area from the central eye point required by design is 0.15 °, and for the calibration device, the minimum angle between adjacent scales is 0.15 °, and the angles of the scales are all 0.15 °. Therefore, even when the reading error reaches the maximum value, the eye box area projected by the head-up display is still within the tolerance zone, so that an observer can see a clear virtual image meeting the requirements on the windshield glass, and the calibration accuracy is high. In another embodiment, the angle of the graduations and the included angle between the graduations may be smaller than the tolerance band of the eye-box area projected by the head-up display.

The foregoing has described a form of transmission that can be commonly employed by mirror drive systems for heads-up displays. One exemplary embodiment of a mirror drive system for a heads-up display of the present disclosure is further described below:

In one exemplary embodiment of the present disclosure, referring to fig. 14 to 15, the mirror drive system includes a drive motor 41 and a drive assembly including a timing gear 42, a worm 43, an internal gear 44, and a drive seat 45. The driving motor 41 is fixed to the bottom wall of the housing 10, and may be mounted to the bottom wall of the housing 10 by a motor bracket 46, for example. The driving motor 41 may be a stepping motor, and the output shaft of the driving motor 41 is coaxial with the speed adjusting gear 42, for example, the speed adjusting gear 42 may be directly sleeved on the output shaft of the driving motor 41 and can rotate synchronously with the output shaft of the driving motor 41. The internal gear 44 is provided at one end of the worm 43 near the speed adjusting gear 42 and is coaxial with the worm 43, and the speed adjusting gear 42 is internally and externally meshed with the internal gear 44 within the internal gear 44. Specifically, referring to fig. 15, the internal gear 44 and the worm 43 may be of an integral structure, i.e., one end of the worm 43 forms the internal gear 44 and meshes with the speed gear 42. The rotation speed of the speed regulating gear 42 is consistent with that of the driving motor 41, and the reduction ratio of the worm 43 relative to the driving motor 41 can be adjusted by adjusting the gear ratio of the internal gear 44 and the speed regulating gear 42.

The transmission seat 45 is fixedly connected with the mirror body 21, specifically, the transmission seat 45 may be disposed at a position near the center of the bottom of the mirror body 21, or disposed at two sides near the rotating shaft 22 of the bottom of the mirror body 21, and one end of the transmission seat 45 is fixed on the mirror body 21 by means of pins, bolts, and the like. In order to make the connection more stable, one end of the transmission seat 45 may be provided with a connection plate, and closely attached to the back side of the reflecting surface 211 of the mirror body 21. The transmission seat 45 is provided with a worm wheel surface on one side far away from the mirror body 21, the transmission seat 45 is meshed with the worm 43 through the worm wheel surface, the worm 43 is a driving part, the transmission seat 45 is a driven part, and a large reduction ratio can be obtained. When the driving motor 41 is started, power is transmitted to the transmission seat 45 through a transmission chain of the driving motor 41, the speed regulating gear 42, the internal gear 44, the worm 43 and the transmission seat 45, so that the transmission seat 45 drives the main reflector 20 to overturn.

In some embodiments, referring to fig. 15, two ends of the worm 43 may also be supported on the motor support 46, and an elastic member 461 such as a spring or a metal elastic sheet may be disposed between the motor support 46 and the bottom wall of the housing 10, where when the motor support 46 is mounted on the bottom wall of the housing 10, the elastic member 461 is compressed, so that a supporting force away from the bottom wall may be applied to the motor support 46, so that the worm 43 and the transmission seat 45 maintain good engagement.

The calibration process of the head-up display of the present disclosure is exemplarily described below in conjunction with the foregoing description of the structure of the head-up display of the present disclosure:

before the head-up display is assembled, a calibration pointer 31 is arranged on the main reflector 20, the working position and the dormant position 101 of the main reflector 20 corresponding to the calibration pointer are determined according to the design eye box area of the head-up display, and a dial 32 comprising working scales and dormant scales 321 corresponding to the working position and the dormant position 101 is arranged on the shell 10. The specific arrangement of the calibration pointer 31 and the dial 32 is referred to the above-mentioned embodiments, and will not be described herein. Thereafter, the housing 10, the main mirror 20, and the mirror drive system are assembled.

Taking the direction of the main reflector 20 from the lower eye box position 104 to the dormant position 101 as a positive direction, and vice versa as a negative direction, taking the middle eye box scale 323 as an example, when the calibration pointer 31 is aligned with the scale mark of the middle eye box scale 323, the reflector transmission system meets the requirement; when the calibration pointer 31 points to a position between the middle and lower eye box scales 323, 324, it is noted as a negative out-of-tolerance; when the calibration pointer 31 points to a position between the middle and upper eye box scales 323 and 322, a positive out-of-tolerance is noted.

Taking the process of the primary mirror 20 from the sleep position 101 to the intermediate eye box position 103 as an example, the calibration pointer 31 is first pointed to the sleep scale 321. According to the theoretical transmission ratio of the mirror transmission system design, the stroke of the driving motor 41 required for rotating the main mirror 20 from the resting position 101 to the intermediate eye box position 103 is calculated, and the driving motor 41 is controlled accordingly to drive the main mirror 20 to rotate. After the rotation is finished, the scale pointed by the calibration pointer 31 is obtained, and if the calibration pointer 31 points to the scale mark of the middle eye box scale 323, the reflector transmission system is judged to meet the requirement; if the calibration pointer 31 points to a position between the middle eye box scale 323 and the upper eye box scale 322, the positive out-of-tolerance of the mirror transmission system is indicated, the transmission system fails to rotate the main mirror 20 to the theoretical position, and the actual transmission ratio is lower than the theoretical transmission ratio; if the calibration pointer 31 points to a position between the middle and lower eye box scales 323, 324, then this indicates that the mirror drive system is negatively out of tolerance, and the actual drive ratio is higher than the theoretical drive ratio.

The magnitude of the out-of-tolerance may be calculated based on the relationship between the actual position of the calibration pointer 31 to the scale disk 32 and the working scale, such as the rotation of the primary mirror 20 from the resting position 101 to the intermediate eye box position 103, the calibration pointer 31 being directed between the intermediate eye box scale 323 and the upper eye box scale 322, and to the middle of one of the auxiliary scales 325 nearest to the intermediate eye box scale 323 and the intermediate eye box scale 323. The angle between the auxiliary graduation 325 and the mid-eye box graduation 323 is 0.15 deg., then it can be considered that an error in the actual transmission ratio of the mirror drive system from the theoretical transmission ratio results in the primary mirror 20 being offset by half of 0.15 deg., i.e., 0.075 deg.. According to the above analysis, the actual transmission ratio of the mirror transmission system is now lower than the theoretical transmission ratio, and the total transmission ratio deviation value, that is, the transmission error of the mirror transmission system, is calculated according to the stepping angle of the stepping motor, the theoretical transmission ratio of the internal gear 44 and the speed adjusting gear 42, and the theoretical transmission ratio of the worm wheel surface and the worm 43, and accordingly, the gear tooth parameters of the speed adjusting gear 42, the internal gear 44, and the worm 43 and the worm wheel surface are adjusted. In this way, the transmission ratio of the reflector transmission system can be quantitatively adjusted, and calibration can be completed at one time.

Of course, the calibration process may be from the dormant position 101 to other working positions, or from the working position to another working position, etc. of the main mirror 20, and in fact, in the case of being able to read the starting position, the ending position and the target position of the calibration pointer 31, one skilled in the art may select different rotation processes for calibrating the head-up display according to specific requirements. To further increase the accuracy of the calibration, in one embodiment, the error of the mirror drive system may be calibrated using the process of turning the primary mirror 20 from the resting position 101 to the operating position, and the calibration result may be verified using the process of returning the primary mirror 20 from the operating position to the resting position 101.

According to a second aspect of the present disclosure, there is provided a calibration method of a head-up display, as shown in fig. 16, the method including steps S1610 to S1650:

step S1610: calibration means are provided according to the design position of the main mirror 20. The calibration device comprises a calibration pointer 31 and a dial plate 32, wherein the calibration pointer 31 is arranged on the main reflector 20, the dial plate 32 is fixedly connected with the shell 10, and the dial plate 32 comprises at least one dormant scale 321 and at least one working scale.

Step S1620: the head-up display is assembled such that the calibration pointer 31 corresponds to the sleep scale 321.

Step S1630: causing the mirror drive system to drive the primary mirror 20 in rotation relative to the housing 10.

Step S1640: the transmission error of the mirror transmission system is calculated from the relation between the actual position of the calibration pointer 31 pointing to the dial 32 and the working scale.

Step S1650: and adjusting the transmission ratio of the transmission system of the reflecting mirror according to the transmission error.

Details and advantages of the steps of the calibration method of the head-up display of the present disclosure have been described in detail in the embodiments of the head-up display above, and are not described in detail herein.

It should be noted that although the various steps of the method of calibrating a heads-up display of the present disclosure are described in a particular order in the present disclosure, this does not require or imply that the steps must be performed in that particular order or that all of the illustrated steps must be performed in order to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform, etc.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any adaptations, uses, or adaptations of the disclosure following the general principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A head-up display, comprising:

a housing;

the calibration device comprises a calibration pointer and a dial, wherein the calibration pointer is arranged on the main reflector, the dial is fixedly connected with the shell, and the dial comprises at least one dormancy scale and at least one working scale;

wherein the calibration pointer corresponds to one of the sleep scales when the primary mirror is in the sleep position; when the main reflector rotates to the working position relative to the shell, the calibration pointer corresponds to one working scale; the calibration device is used for calculating the transmission error of the reflector transmission system according to the relation between the actual position of the calibration pointer pointing to the dial and the working scale, and the transmission error is used for adjusting the transmission ratio of the reflector transmission system.

2. The head-up display of claim 1, wherein the inner wall of the housing comprises a bottom wall and a side wall surrounding the bottom wall, and wherein a rotating bracket is fixedly connected to the side wall;

the main reflector comprises a reflector body and a rotating shaft, one side of the reflector body is a reflecting surface, and the rotating shaft is arranged on one side of the reflector body adjacent to the reflecting surface and extends towards a direction away from the reflector body; the rotating shaft is hinged to the rotating bracket, so that the reflecting surface is rotatably arranged around the rotating shaft relative to the shell;

3. The head-up display according to claim 2, wherein the rotating bracket is provided with a mounting hole, the rotating shaft sequentially comprises a transition section and a connecting section along the direction away from the mirror body, the connecting section stretches into the mounting hole, and two opposite ends of the transition section are respectively connected with the mirror body and the connecting section;

the calibration pointer is arranged on the outer peripheral surface of the transition section.

4. The head-up display of claim 1, wherein the inner wall of the housing comprises a bottom wall and a side wall surrounding the bottom wall, and wherein a rotating bracket is fixedly connected to the side wall;

the calibration pointer is arranged on one side of the mirror body adjacent to the reflecting surface.

5. The heads-up display of claim 4 wherein the dial is provided on the side wall.

6. The head-up display of claim 5, wherein the side of the mirror body adjacent to the dial plate and adjacent to the reflective surface is provided with an indicator plate extending in a direction away from the mirror body, and the alignment pointer is provided on the indicator plate.

7. The heads-up display of any of claims 2-6 wherein the working position comprises at least an upper eye box position and a lower eye box position, the working scale comprises at least an upper eye box scale and a lower eye box scale, the dial further comprises a plurality of auxiliary scales, and a plurality of the auxiliary scales are evenly distributed between the upper eye box scale and the lower eye box scale;

The maximum value of the included angle between the two geometric points on the upper eye box scale and the rotating shaft connecting line, the maximum value of the included angle between the two geometric points on the lower eye box scale and the rotating shaft connecting line, the maximum value of the included angle between the two geometric points on the auxiliary scale and the rotating shaft connecting line, and the included angle between any two adjacent auxiliary scales are all equal.

8. The heads-up display of claim 7 wherein the transmission assembly includes a timing gear, a worm, an internal gear, and a transmission mount;

the driving motor is fixed on the bottom wall, an output shaft of the driving motor is coaxial with the speed regulating gear, the internal gear is arranged at one end of the worm close to the speed regulating gear and is coaxial with the worm, and the speed regulating gear is internally and externally meshed with the internal gear in the internal gear; the transmission seat is fixedly connected with the mirror body, and one side, far away from the mirror body, of the transmission seat is provided with a worm wheel surface meshed with the worm.

9. The head-up display of claim 8, wherein the display comprises,

10. A method for calibrating a head-up display, the head-up display comprising a housing, a primary mirror, a mirror drive system, and a calibration device, the method comprising:

the calibration device is arranged according to the design position of the main reflector, and comprises a calibration pointer and a dial, wherein the calibration pointer is arranged on the main reflector, the dial is fixedly connected with the shell, and the dial comprises at least one dormancy scale and at least one working scale;

enabling the reflector transmission system to drive the main reflector to rotate relative to the shell;

And adjusting the transmission ratio of the reflector transmission system according to the transmission error.