Automobile stray light prevention dustproof film, vehicle-mounted head-up display device and motor vehicle

Abstract

The utility model discloses an automobile stray light prevention dustproof film which is provided with a curved surface structure designed based on elliptical optical characteristics, and the curved surface structure is obtained after the section curve of the dustproof film extends horizontally. The section curve is a part of an elliptic curve and accounts for 1 / 4-1 / 6 of the complete elliptic curve; an extension part is arranged in the tangential direction of the front end of the curved surface of the dustproof film, the extension part extends towards the front of the automobile, the extension length is 20-50mm, and the included angle between the extension part and the horizontal plane is 0.5-1 degree. The utility model also discloses a vehicle-mounted head-up display device and / or a motor vehicle comprising the dustproof film.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of vehicle head-up display, and relates to an automobile anti-glare dustproof film, a vehicle head-up display device and a motor vehicle. BACKGROUND

[0002] At present, the vehicle head-up display system (HUD) has become one of the important technologies for modern vehicles to improve the user driving experience. The HUD reduces the frequency of the driver looking down to check the instrument panel by projecting vehicle information into the driver's line of sight, thereby improving driving safety. However, during the development of the HUD, the design of the dustproof film becomes an important factor affecting the display quality and system performance:

[0003] The design method of the existing dustproof film usually relies on experience and manual adjustment, which leads to the following problems:

[0004] 1. The anti-glare performance may be insufficient: the existing dustproof film design may not completely block external stray light, especially in strong sunlight or complex light conditions, which easily introduces external stray light from the sky, thereby affecting the readability and contrast of the HUD display content.

[0005] 2. Low development efficiency: when designing the surface shape of the dustproof film using the traditional method, multiple tests and adjustments are required, which not only consumes time and effort, but also may not obtain the optimal solution.

[0006] 3. Insufficient optical precision: in optical design, the shape of the dustproof film has strict requirements on the reflection and shielding performance of light, but the existing method cannot meet the high-precision design requirements.

[0007] For example, Chinese invention patent CN115509014B describes a HUD cover device, which can improve the problem of stray light to a certain extent, but its design does not fully utilize the optimization of optical laws, so there may still be problems of incomplete protection and low shape design efficiency. INVENTION CONTENTS

[0008] In order to solve the problems existing in the prior art, the purpose of the utility model is to provide an automobile anti-glare dustproof film, a vehicle head-up display device and a motor vehicle. The dustproof film in the utility model is designed and manufactured by a dustproof film drawing method based on the optical characteristics of an ellipse, to effectively solve the following technical problems:

[0009] 1. 100% blockage of external stray light: by utilizing the optical characteristics of an ellipse, it is ensured that all external light sources reflected by the dustproof film cannot be reflected into the human eye through the windshield, thereby effectively blocking external stray light and improving the contrast and readability of the HUD display content.

[0010] 2. Improve development efficiency: through Catia modeling software, according to the environmental data, the elliptical equation curve is flexibly drawn, the tedious and irregular manual adjustment and multiple optical simulation operations are avoided, the development period is greatly shortened, and the work efficiency is improved.

[0011] 3. Improve optical accuracy: by accurately drawing the shape of the dustproof film, it can perfectly match the optical path design of the HUD, so as to improve the accuracy of light shielding and reflection, and significantly optimize the display performance of the whole system.

[0012] The utility model provides a kind of automobile anti-glare dustproof film, the dustproof film has the curved surface structure designed based on elliptical optical characteristics, is obtained after the section curve of the dustproof film extends horizontally;The section curve is part of elliptical curve, 1 / 4~1 / 6 of complete elliptical curve, preferably, 1 / 5;The tangent direction of the curved surface front end of the dustproof film is provided with extension, the extension extends to the direction of vehicle front, and the extension length is 20-50mm, the included angle between the extension and horizontal plane is 0.5-1 °;Preferably, the extension length is 30mm, and the included angle is 1 ° below horizontal plane.

[0013] In the utility model, the upper focal point of the elliptical curve corresponding to the dustproof film is symmetrical about the windshield glass with the driver's eye box observation position;

[0014] The lower focal point is hidden in the automobile instrument panel structure;

[0015] The position of the lower focal point moves on the reflected light of the light ray at the lowermost end of the lower eye box on the windshield glass;The longitudinal position of the lower focal point does not exceed the longitudinal range of the reflected light, and is lower than the height of vehicle instrument table;After the longitudinal position is determined, the transverse position is adjusted within the range of 2-10mm in front and rear directions of vehicle.

[0016] The straight line distance between the upper and lower focal points of the elliptical curve is the focal distance 2c;

[0017] The major axis radius a of the elliptical curve is calculated by the following formula:

[0018]

[0019] Wherein, d max is the maximum value of the total length from the upper focal point to the dustproof film curved surface reflection point and the lower focal point to the reflection point path;

[0020] The radius b of the minor axis of the elliptical curve is calculated by the following formula:

[0021]

[0022] The complete elliptical curve equation is:

[0023]

[0024] The utility model also provides a vehicle head-up display device, vehicle head-up display device includes above-mentioned dustproof membrane, dustproof membrane fixed installation setting below instrument panel cover plate, lower focal point line hides in the instrument panel cover plate inside.

[0025] The utility model also provides a motor vehicle, the motor vehicle includes above-mentioned dustproof membrane or above-mentioned vehicle head-up display device.

[0026] Through dustproof membrane in the utility model, not only can significantly improve the display effect of HUD, can shorten the development cycle of dustproof membrane, provide a kind of efficient, accurate dustproof membrane design scheme for the development of vehicle HUD technology.

[0027] The utility model also provides a kind of above-mentioned automobile anti-glare dustproof membrane design method, the design method includes:

[0028] Step one, determine the focal point position and curve parameter of the dustproof membrane profile curve corresponding ellipse, obtain the ellipse curve equation;The profile curve of the dustproof membrane is a part of the ellipse curve, accounts for 1 / 4~1 / 6 of the complete ellipse curve, preferably, 1 / 5;

[0029] Step two, based on the ellipse curve parameter equation in step one, the profile curve of the dustproof membrane is stretched three-dimensionally, to generate complete dustproof membrane surface;

[0030] Step three, the front end of the dustproof membrane surface corresponding to the front direction of the vehicle is extended and the included angle is adjusted, and the anti-glare dustproof membrane is obtained.

[0031] In step two, according to the light rays and left and right limit positions of the vehicle head-up display device, the profile curve of the dustproof membrane is stretched in the horizontal direction, so that the light rays cannot be observed by the eye box through the dustproof membrane shielding position, and the complete dustproof membrane surface is obtained.

[0032] In the utility model, the lower focal point line connected by the lower focal point of the corresponding ellipse curve of the stretched curved surface is hidden in the vehicle instrument panel structure.

[0033] In step three, the dustproof membrane surface is extended in the tangent direction of the front end (i.e. the front direction of the vehicle), and the extension length is 20-50mm, and the included angle between the extension part and the horizontal plane is 0.5-1°;Preferably, 30mm, and the included angle is 1° below the horizontal plane.

[0034] In the utility model, step three further includes:

[0035] Based on the whole vehicle assembly tolerance, the dustproof membrane generated by the above design is simulated and verified, and the reflection in the full angle range is simulated;The whole vehicle assembly tolerance is ±3mm;

[0036] And / or,

[0037] The dustproof film is optimized according to the position of the whole vehicle instrument desk, and the structure of the instrument desk shell is optimized and designed.

[0038] The anti-dust film in the utility model is applicable to the vehicle-mounted head-up display system HUD, has a curved surface structure designed based on the elliptical optical characteristics, and the curved surface is determined by the following method:

[0039] The upper focal point is located at the optical reflection point position in the driver's eye box observation range;

[0040] The lower focal point is hidden in the vehicle instrument panel structure, so that external light is prevented from being reflected into the driver's line of sight through the point;

[0041] According to the upper and lower focal point positions and the limit beam path of the vehicle HUD light path, the major axis and minor axis dimensions of the ellipse are calculated.

[0042] The curved surface front end extension part forms an angle of 0.5-1° with the horizontal plane, is used for guiding water vapor flow, and improves the protection performance of the vehicle in a high humidity environment;

[0043] The lower focal point of the dustproof film is designed to overlap with the shielding area of the whole vehicle instrument panel and the shell structure, and the point is hidden to achieve full-angle blocking of stray light.

[0044] The beneficial effects of the utility model include: the dustproof film designed based on the elliptical optical characteristics can block 100% of stray light, improve the clarity, contrast and readability of the HUD display; by modeling the shape of the dustproof film in advance, the need for manual adjustment and multiple tests is reduced, and the development cycle is shortened to 50% of the original; the dynamic adjustment design method is suitable for different vehicle models, and the modular design facilitates subsequent iteration. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0046] Figure 1 It is the different angle dustproof film structure schematic diagram of the utility model.

[0047] Figure 2 It is the light propagation situation schematic diagram of the utility model after installing the dustproof film.

[0048] Figure 3 It is the light propagation situation schematic diagram of the utility model after not installing the dustproof film.

[0049] Figure 4 It is the light propagation situation schematic diagram after installing the dustproof film of the utility model.

[0050] Figure 5 It is the light propagation into the eyebox situation schematic diagram after installing the dustproof film of the utility model.

[0051] Figure 6 It is the dustproof film related structure schematic diagram of the utility model.

[0052] In the drawing, 1 - windshield, 2 - lower focal point line, 3 - dustproof film, 4 - instrument panel cover plate, 5 - reflector, 6 - eyebox, 7 - image generation unit, 8 - upper focal point. DETAILED DESCRIPTION

[0053] The utility model is further explained in detail in combination with the following specific embodiment and drawing. The process, condition, experimental method etc. of implementing the utility model are the general knowledge and common knowledge of the art except the following specially mentioned content, and the utility model has no special limited content.

[0054] The utility model provides a kind of automobile anti-glare dustproof film, the dustproof film 3 has the curved surface structure designed based on elliptical optical characteristics, is obtained after the horizontal extension of the section curve of the dustproof film;The section curve is part of elliptical curve, and 1 / 4~1 / 6 of complete elliptical curve;The tangent direction of the curved surface front end of the dustproof film 3 is provided with extension, the extension extends to the front direction of vehicle, and the extension length is 20-50mm, and the included angle of the extension part with horizontal plane is 0.5-1 °.

[0055] The upper focal point 8 of the elliptical curve is symmetrical about windshield 1 with driver eyebox observation position;

[0056] The lower focal point is hidden in the structure of automobile instrument panel.

[0057] The position of the lower focal point moves on the reflected light of windshield at the lowermost end of lower eyebox;The longitudinal position of the lower focal point does not exceed the longitudinal range of the reflected light, and is lower than the height of vehicle instrument table;After the longitudinal position is determined, the transverse position is adjusted within 2-10mm range in front and rear direction of vehicle.

[0058] The straight line distance between the upper and lower focal points of the elliptical curve is focal point spacing 2c;

[0059] The major axis radius a of the elliptical curve is calculated by the following formula:

[0060]

[0061] Wherein, d maxis the maximum value of the total length of the path from the upper focal point 8 to the dustproof film curved reflection point and the path from the lower focal point to the reflection point;

[0062] The radius b of the short axis of the elliptic curve is calculated by the following formula:

[0063]

[0064] The complete elliptic curve equation is:

[0065]

[0066] The utility model also provides a kind of vehicle head-up display device, the vehicle head-up display device includes above-mentioned dustproof film;The dustproof film 3 is fixedly installed and arranged below instrument panel cover plate 4, and the lower focal point line 2 of the dustproof film 3 is hidden in the inside of the instrument panel cover plate 4.

[0067] The utility model also provides a kind of motor vehicle, the motor vehicle includes above-mentioned dustproof film 3, or above-mentioned vehicle head-up display device.

[0068] The utility model also provides a kind of design method of above-mentioned dustproof film 3, the design method is by defining the position of focal point line (Focal Bar) and optimizing the design of elliptic curve, so that HUD system can effectively prevent glare into human eye, satisfy high-precision and high-efficiency anti-glare demand.

[0069] As Figure 1 It is the dustproof film different angle structure schematic drawing of the utility model.

[0070] It needs to be noted that the complete ellipse shown in the utility model drawing is not entity structure, and the section curve of dustproof film curve only corresponds to a part in ellipse, and the lower focal point line 2 referred to in the utility model is not entity structure.

[0071] As Figure 2 It is the light propagation situation schematic drawing after installing dustproof film of the utility model. The upper focal point 8 of ellipse and the positive center observation position of eyebox 6 are based on windshield 1 symmetry.

[0072] Dustproof film elliptic curve design:

[0073] According to the optical requirement of HUD system and the position of whole vehicle eyebox, the focal point position (Focal Points) of ellipse is determined, that is:

[0074] Upper focal point: it is obtained by windshield 1 symmetry from the positive central observation position of eyebox 6.

[0075] Lower focal point: it is located in the IP table structure of whole vehicle, ensures that it is hidden in Bezel, to avoid that light is reflected after passing through lower focal point and enters eyebox 6.

[0076] According to the focal point position and the upper and lower eyebox limit beams, the major axis and minor axis sizes of the ellipse are calculated and determined, and the ellipse equation curve is drawn.

[0077] The calculation method of the major axis and minor axis sizes of the ellipse is as follows:

[0078] The focal point distance 2c, i.e. the straight line distance between the upper and lower focal points, can be measured after the position of the lower focal point is determined.

[0079] The major axis (2a) of the ellipse is the maximum diameter of the entire ellipse curve, and the calculation formula of the major axis radius a is: a = d max / 2, where d max is the maximum value of the total length of the path from the upper focal point to the dustproof film reflection point and from the lower focal point to the reflection point. And d max is determined by the upper and lower limit positions of the light rays, which can be measured by the maximum light path distance between the eyebox position and the dustproof film reflection point.

[0080] The minor axis of the ellipse curve is denoted as 2b, and the half minor axis is calculated by:

[0081]

[0082] The complete ellipse curve equation is:

[0083]

[0084] According to the light rays and the left and right limit positions of the vehicle-mounted head-up display device, the dustproof film cross-sectional curve is stretched in the horizontal direction to obtain a complete dustproof film curve.

[0085] Considering the actual assembly tolerance of the whole vehicle, the curve of the lower focal point is stretched in the same direction to ensure the shielding effect of the focal bar within the ±3mm tolerance range.

[0086] Focal Bar design and hiding:

[0087] Focal Bar (focal line, more specifically, lower focal line 2) is defined as the linear extension of the lower focal point of the ellipse, which is hidden inside the vehicle Bezel (instrument panel cover plate 4) to prevent light from entering the upper focal point 8 after being reflected from the dustproof film 3.

[0088] Specifically, in one specific implementation process of the utility model, the lower focal point line 2 is a straight line through the lower focal point, the direction of the straight line is consistent with the stretching direction of the dustproof film 3, generally the straight line is taken as the center to make a cylinder with a diameter of 6mm, which is defined as focal bar, and ensure that the cylinder can be hidden in the IP table, the consideration of 6mm is that the focal point line can still be completely hidden under the condition of considering the whole vehicle assembly tolerance, so that the HUD dustproof film can play the role of preventing external stray light, such as Figure 6 As shown.

[0089] This design principle ensures that the dustproof film 3 can completely prevent stray light from entering the eye through the elliptical path, thereby solving the glare problem of the HUD system.

[0090] Optical simulation and performance verification:

[0091] Through optical simulation, the light behavior under each sunlight angle is simulated by observing the 300x300mm eyebox position, and it is verified that the dustproof film and focal bar design can effectively prevent the glare problem.

[0092] On the basis of theory and simulation verification, it is ensured that the cooperation of the dustproof film 3 and the whole vehicle bezel meets the actual assembly requirements.

[0093] As shown in Figure 3 The light propagation situation schematic diagram after the dustproof film is not installed, as shown in Figure 4 The light propagation situation schematic diagram after the dustproof film 3 is installed.

[0094] Vehicle adaptability design:

[0095] The dustproof film 3 design needs to be adapted according to the whole vehicle structure and IP table position, and is installed below the instrument panel cover plate 4. In order to ensure the shielding effect, it is suggested that the design of the bezel needs to be optimized in combination with the dustproof film surface type, so as to ensure the accuracy of the HUD light path and the anti-stray light performance of the system.

[0096] In the specific implementation process, the height of the IP table (instrument panel table) is improved to ensure that the focal bar can be completely hidden.

[0097] The dustproof film and focal bar in the utility model are verified to be able to effectively prevent glare from entering the eyebox under various sunlight angles, and significantly improve the contrast and clarity of the HUD display content.

[0098] The method for designing the dustproof film of the utility model greatly improves the efficiency of dustproof film design and production, and provides a modular design idea suitable for HUD systems of different vehicle models.

[0099] As shown in Figure 2As shown, the Focal bar (focal line) is the position of the lower focus of the ellipse. When it is hidden in the IP structure of the whole vehicle, i.e. the light cannot pass through the lower focus, the light cannot be reflected into the upper focus through the dustproof film (part of the ellipse equation), and the upper focus is the point symmetric to the windshield 1 from the eyebox observation position, so it can be concluded that the light cannot be reflected into the human eye to form stray light; specifically, when the light of the external light source can pass through the focal line, the reflected light path will definitely pass through the upper focus area. According to the symmetry relationship, the light reflected by the windshield 1 will also inevitably enter the human eye observation area, i.e. produce stray light. If the focal line is hidden, the light path of the external light source cannot pass through the focal area to be reflected by the dustproof film, so stray light will not appear. This phenomenon follows the optical properties of the ellipse: i.e. the light passing through the focus of the ellipse will be reflected by the inner wall of the ellipse and will definitely pass through the other focus of the ellipse.

[0100] The dustproof film drawing design method based on the optical properties of the ellipse provided by the utility model significantly solves the problems of insufficient anti-glare performance, low development efficiency and insufficient optical precision in the prior art. The beneficial effects of the utility model compared with the prior art are analyzed from multiple aspects as follows:

[0101] 1. 100% blockage of external stray light

[0102] Theoretical basis: The dustproof film curve is designed based on the optical properties of the ellipse (the light reflected by one focus of the ellipse will pass through the other focus), and the focal line is hidden in the IP structure of the whole vehicle, so as to ensure that the external light cannot be reflected into the human eye through the dustproof film.

[0103] As Figure 5 shown is a schematic diagram of the light propagation into the eyebox after the dustproof film is installed. The light emitted by the image generation unit 7 continues to propagate after being reflected by the mirror 5 until it enters the eyebox 6 position.

[0104] Practical effect: Compared with the traditional dustproof plate which relies on multiple tests and experience adjustment for design, the dustproof film of the utility model can completely block all angles of external stray light, and fundamentally solves the glare problem of the HUD system.

[0105] Simulation verification: Through optical simulation verification, it is observed at the 300x300mm eyebox position that the sunlight does not form a reflection phenomenon in the full angle range.

[0106] 2. Significant improvement in development efficiency

[0107] Existing problems: The traditional method usually needs to complete the design of the dustproof film through repeated tests and manual adjustment, which not only consumes a lot of time, but also may increase the development cost; specifically, the dustproof film made by the traditional method usually needs to be analyzed by optical simulation, the curvature of the dustproof film is modified, and the iteration is repeated for many times, so that the external stray light can be finally avoided, even so, there is a probability that the external stray light cannot be completely eliminated 100%, and the development efficiency and period need a long time.

[0108] Improvements of the utility model: by using Catia modeling software to draw an elliptical surface combined with light path, the dustproof film shape can be quickly drawn by only inputting the upper and lower focal point positions and the limit beam parameters, and the tedious manual adjustment process is reduced.

[0109] Practical effects: The development efficiency is improved by about 50% compared with the prior art, the design period is shortened from 2-3 weeks of the traditional method to less than 1 week, and the development time and labor cost are greatly reduced.

[0110] 3. Improvement of optical precision

[0111] Theoretical basis: By using the accurately calculated long and short axis parameters of the ellipse, the curved surface of the dustproof film can perfectly match the optical path of the HUD system, and high-precision shielding and reflection performance can be achieved.

[0112] Practical effects: The optical simulation results show that the dustproof film designed by the utility model can maintain high-efficiency anti-glare performance under all light angles, and the reflection problem caused by shape error in the existing design is avoided.

[0113] Comparison data: Compared with the traditional HUD protection device in patent CN115509014B, the dustproof film of the utility model has significant improvement in the precision of stray light shielding and optical performance.

[0114] In actual detection, the dustproof film designed by the dustproof film design method in the utility model can avoid 100% external stray light, and under the condition that the simulation light number is set to 1 billion, no light passes through the receiver.

[0115] 4. Extensive applicability

[0116] Flexible adaptation: The utility model can dynamically adjust the elliptical parameters according to the needs of different vehicle types and HUD systems, and generate dustproof film designs suitable for specific vehicle environments.

[0117] Enhanced versatility: Through modular design ideas, the method in the utility model is applicable to the HUD systems of various vehicles, facilitating the upgrading and iteration of subsequent products.

[0118] 5. Optimization of vehicle performance

[0119] Structure compatibility: The design of the dustproof film is combined with the Bezel structure of the whole vehicle, which not only improves the optical performance of the HUD, but also reduces the error accumulation in the assembly process of the whole vehicle.

[0120] Performance reliability: Optical verification shows that the dustproof film can maintain high anti-glare performance within the assembly tolerance range of ±3mm, and the display effect is not affected by the assembly error.

[0121] In summary, compared with the prior art, the dustproof film in the utility model is designed based on the scientific elliptical optical principle and accurate focal point position calculation, which has significant advantages in anti-glare performance, development efficiency, optical accuracy, applicability and vehicle compatibility. These beneficial effects have been fully verified by theoretical calculation and optical simulation, and provide an efficient, accurate and reliable solution for the further development of vehicle-mounted HUD technology.

[0122] Embodiment one: Ellipse equation drawing and surface generation

[0123] 1. Definition of ellipse equation:

[0124] As shown in the accompanying Figure 1 , the utility model is based on the optical characteristics of the ellipse, and the curvature shape of the dustproof film is determined by defining the focal point position of the ellipse.

[0125] The two foci of the ellipse are defined as:

[0126] Upper focal point: obtained by symmetry from the eyebox observation position through the windshield 1, used to determine the target reflection point of the HUD light.

[0127] Lower focal point: hidden in the IP table structure inside the whole vehicle, to ensure that stray light cannot be reflected into the upper focal point 8 through the lower focal point.

[0128] 2. Calculation of major axis and minor axis:

[0129] According to the actual measurement of the upper and lower focal point positions, the focal point distance (2c) of the ellipse and the maximum value of the path of the upper and lower limit light beam (dmax) are determined

[0130] The calculation formula is:

[0131] The major axis radius a and the minor axis radius b calculated are used to draw the complete ellipse equation:

[0132]

[0133] 3. Surface stretching:

[0134] According to the requirements of the HUD optical path, an elliptical equation curve is input in the Catia software and stretched in three dimensions to generate a complete dustproof film surface.

[0135] The front end of the dustproof film surface is extended to form a-1° angle with the horizontal plane, ensuring that water vapor can be drained.

[0136] Example Two: Focal Line Concealment and Vehicle Adaptation

[0137] 1. Focal line concealment design:

[0138] As shown in the accompanying Figure 2 , the lower focal point (Focal Bar) of the ellipse is designed to be hidden inside the vehicle IP table structure, ensuring that the dustproof film in the working state after assembly will not allow external light sources to reflect light into the eye (upper focal point).

[0139] Through simulation verification of the vehicle assembly tolerance (±3mm), even with some tolerance deviation, the Focal Bar can always be completely blocked by the IP table and Bezel.

[0140] 2. Vehicle adaptation and optimization:

[0141] The curved surface shape of the dustproof film is adapted and optimized according to the position of the vehicle IP table, ensuring perfect matching with the HUD optical path.

[0142] The design of the Bezel structure needs to be adjusted according to the dustproof film curve to further improve the blocking performance and assembly stability.

[0143] Example Three: Optical Simulation and Performance Verification

[0144] 1. Optical simulation test:

[0145] Optical simulation is performed at a 300x300mm eyebox position to simulate the reflection of sunlight in the full angle range.

[0146] The verification results show that the dustproof film can effectively block all external stray light without any reflection into the eyebox.

[0147] 2. Comparison test:

[0148] Compared with the HUD protection device described in the prior art (such as patent CN115509014B), the dustproof film of the present utility model has significantly improved performance in stray light blocking ability and shielding accuracy.

[0149] The dustproof film using the traditional design method may have light leakage problems at some angles (such as low incident angle), while the present utility model can completely avoid such problems.

[0150] Effect of technical improvement

[0151] 1. Significantly improve anti-glare performance:

[0152] The dust-proof film designed by elliptical optical characteristics can block 100% stray light, improve the clarity, contrast and readability of HUD display.

[0153] 2. Greatly improve development efficiency:

[0154] Automatic modeling reduces the need for manual adjustment and multiple trials, and the development cycle is shortened to 50% of the original.

[0155] 3. Enhance vehicle adaptability:

[0156] The dynamic adjustment design method is suitable for different vehicle models, and the modular design is convenient for subsequent iteration.

[0157] The protection scope of the utility model is not limited to the above embodiments. Changes and advantages that can be thought of by those skilled in the art without departing from the spirit and scope of the utility model concept are included in the utility model, and the appended claims are the protection scope.

Claims

1. A car anti-glare and dustproof film, characterized in that, The dustproof film (3) has a curved surface structure designed based on the optical properties of an ellipse, which is obtained by horizontally extending the cross-sectional curve of the dustproof film; the cross-sectional curve is a part of the elliptical curve, accounting for 1 / 4 to 1 / 6 of the complete elliptical curve; an extension is provided in the tangential direction of the front end of the curved surface of the dustproof film (3), the extension extends in the direction of the front of the vehicle, the extension length is 20-50mm, and the angle between the extension and the horizontal plane is 0.5-1°.

2. The dustproof film as described in claim 1, characterized in that, The upper focus (8) of the elliptic curve is symmetrical with respect to the driver's eye box observation position about the windshield (1), and the lower focus is hidden in the structure of the car dashboard.

3. The dustproof film as described in claim 2, characterized in that, The position of the lower focal point is such that the light at the bottom of the lower eye box moves on the reflected light from the windshield (1); the longitudinal position of the lower focal point does not exceed the longitudinal range of the reflected light and is lower than the height of the vehicle dashboard; after the longitudinal position is determined, the lateral position is adjusted within a range of 2-10mm in the front and rear directions of the vehicle.

4. The dustproof film as described in claim 1, characterized in that, The straight-line distance between the upper and lower foci of the elliptic curve is the focal spacing 2c. The major axis radius 'a' of the elliptic curve is calculated using the following formula: Where, d max It is the maximum value of the total path length from the upper focal point to the reflection point on the curved surface of the dustproof film and from the lower focal point to the reflection point; The radius b of the minor axis of an elliptic curve is calculated using the following formula: The complete equation of the elliptic curve is:

5. A vehicle-mounted head-up display device, characterized in that, The vehicle head-up display includes a dustproof film (3) as described in any one of claims 1-3; the dustproof film (3) is fixedly installed below the instrument panel cover (4), and the lower focal line of the dustproof film is hidden inside the instrument panel cover (4).

6. A motor vehicle, characterized in that, The motor vehicle includes a dustproof film (3) as described in any one of claims 1-4, or a head-up display device as described in claim 5.

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