Glass-based free-form surface mirror

Abstract

The embodiment of the utility model belongs to the technical field of free-form surface mirrors. The utility model also relates to a glass-based free-form surface mirror, which comprises a free-form surface mirror main body, and the corner of the free-form surface mirror main body is provided with an inverted R angle. According to the free-form surface mirror, the four corners of the free-form surface mirror body are chamfered to form the chamfered R corners at the corners of the free-form surface mirror body, the stress concentration part is cut off through the chamfered R corners, and therefore the situation that wrinkles occur in the stress concentration area and extend inwards is reduced; due to the arrangement of the inverted R angle, stress can be distributed more uniformly in the hot bending process of the free-form surface mirror main body, and the problem of wrinkles caused by uneven stress is reduced; the R angle chamfering treatment provides a sufficient extension space for the free-form surface mirror main body, so that the free-form surface mirror main body can better fit the shape of a mold in the hot bending process, and the generation of wrinkles is further reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of freeform surface mirror more particularly, relate to a kind of glass-based freeform surface mirror. BACKGROUND

[0002] Automobile heads-up display system (HUD) as the important component of modern driving auxiliary system, in recent years, the application in various types of vehicles presents the trend of rapid growth, the system is by the vehicle driving information projection to the windshield glass in front of driver, so that driver does not need to look down and check instrument panel, thereby improves driving safety and convenience, under the active promotion of the new force of making car, the cost of HUD system is continuously reduced, gradually from high-end vehicle to low-end vehicle popularization, market demand continues to expand;In the core components of HUD system, freeform surface mirror plays a vital role, it is responsible for accurately guiding image light to the line of sight range of driver, realizes clear, distortionless image display, traditional freeform surface mirror usually uses plastic injection molding way to make, but in recent years, with the progress of material science and manufacturing process, more and more manufacturers begin to try to use the way of glass hot bending to make freeform surface mirror;

[0003] Glass hot bending process has many advantages, such as high light transmittance, high thermal stability, excellent surface finish, etc., these characteristics make glass freeform surface mirror better in imaging quality, durability and reliability, however, glass hot bending process also faces some technical problems when making freeform surface mirror, especially the four curved shape of freeform surface mirror puts forward very high requirements to the manufacturing process;

[0004] The current common hot bending mode includes that cut rectangular glass is placed in mould, and is formed after the glass closely adheres to mould by gravity or applied pressure after high-temperature softening, however, both ways have wrinkle problem, seriously affect the surface morphology and imaging quality of freeform surface mirror;Wrinkle problem mainly shows that small undulation and unevenness appear on the surface of freeform surface mirror, and these undulation and unevenness can cause light scattering and refraction in the process of propagation, thereby affecting the clarity of image and the distortion degree of edge.Therefore we improve, and propose a kind of glass-based freeform surface mirror. UTILITY MODEL CONTENT

[0005] The technical problem to be solved by the embodiment of the utility model is the wrinkle problem when freeform surface mirror is hot bending formed.

[0006] In order to solve the above technical problem, the utility model adopts the technical scheme as follows:

[0007] A kind of glass-based freeform surface mirror, comprising: freeform surface mirror main body, the corner of the freeform surface mirror main body is provided with inverted R angle.

[0008] As an improved mode of the utility model, the surface peak-valley difference of the free-form surface mirror body is ≤50μm.

[0009] As an improved mode of the utility model, the roughness of the free-form surface mirror body is ≤10nm.

[0010] As an improved mode of the utility model, the radius range of the inverted R angle is 0.5mm-2mm.

[0011] As an improved mode of the utility model, the free-form surface mirror body is made of optical glass material.

[0012] As an improved mode of the utility model, the refractive index range of the optical glass material is 1.5-1.8.

[0013] As an improved mode of the utility model, the surface of the free-form surface mirror body is plated with a reflective film.

[0014] As an improved mode of the utility model, the surface of the free-form surface mirror body is provided with a hydrophobic coating, and the water contact angle of the hydrophobic coating is ≥110°, so as to improve the anti-fouling and waterproof performance of the free-form surface mirror body.

[0015] As an improved mode of the utility model, the hydrophobic coating is a fluorosilane coating, and the coating thickness is 50-200nm.

[0016] As an improved mode of the utility model, the surface of the free-form surface mirror body is coated with an antistatic coating.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] To solve the problem of wrinkles in the heat bending forming of the free-form surface mirror in the prior art, the four corner portions of the free-form surface mirror body are chamfered to form inverted R angles at the corner portions of the free-form surface mirror body, the stress concentrated portions are cut off through the set inverted R angles, so that the wrinkles in the stress concentration area are reduced and extend inward; the setting of the inverted R angles makes the stress of the free-form surface mirror body more evenly distributed in the heat bending process, reduces the wrinkles caused by uneven stress; the inverted R angle processing provides sufficient extension space for the free-form surface mirror body, so that the free-form surface mirror body can better fit the shape of the mold in the heat bending process, thereby reducing the generation of wrinkles. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The structure schematic diagram of the glass-based free-form surface mirror provided by the application is shown in the figure.

[0020] Figure 2The bottom view structural schematic diagram of the glass-based free-form mirror provided in the present application is shown in the figure.

[0021] Figure 3 The front view structural schematic diagram of the glass-based free-form mirror provided in the present application is shown in the figure.

[0022] Figure 4 The top view structural schematic diagram of the glass-based free-form mirror provided in the present application is shown in the figure.

[0023] The figure shows:

[0024] 1, free-form mirror body; 2, inverted R angle. DETAILED DESCRIPTION

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used in this description, the term "exemplary" means that an example is being described, and that the example can be combined with other examples, unless otherwise indicated. The phrase "in one embodiment" as used herein does not necessarily refer to the same embodiment, although it may. In describing the embodiments, specific terminology is used to describe particular features, structures, or characteristics. However, the application is not limited to the specific terminology so as long as it is consistent with the principle of the application.

[0026] As described in the background, the glass thermal bending process has many advantages, such as high light transmittance, high thermal stability, excellent surface finish, etc., which makes the glass free-form mirror perform better in imaging quality, durability and reliability, however, the glass thermal bending process also faces some technical problems in the production of free-form mirrors, especially the four-curved shape of the free-form mirror puts forward very high requirements on the production process.

[0027] The common thermal bending methods at present include putting the cut rectangular glass into a mold, and then using gravity or applying pressure to make the glass adhere to the mold after softening at high temperature, however, both of these two methods have the problem of wrinkles, which seriously affects the surface morphology and imaging quality of the free-form mirror; the problem of wrinkles mainly shows that small undulations and unevenness appear on the surface of the free-form mirror, which will cause scattering and refraction of light during propagation, thereby affecting the clarity of the image and the degree of edge distortion.

[0028] In order to solve this technical problem, the present application provides a glass-based free-form mirror.

[0029] Specifically, please refer to Figures 1-4 The glass-based free-form mirror specifically comprises:

[0030] The free-form surface mirror body 1 is provided with a reverse R corner 2 at the corner.

[0031] The glass-based free-form surface mirror provided by the utility model, the reverse R corner 2 is formed at the corner of the free-form surface mirror body 1 by chamfering the four corners of the free-form surface mirror body 1, the stress concentration part is cut off by the reverse R corner 2, thereby reducing the wrinkle and extension inside the stress concentration area; the stress is more evenly distributed in the heat bending process of the free-form surface mirror body 1 by the reverse R corner 2, thereby reducing the wrinkle problem caused by uneven stress; the reverse R corner 2 provides sufficient extension space for the free-form surface mirror body 1, so that the free-form surface mirror body 1 can better fit the mold shape in the heat bending process, thereby reducing the wrinkle.

[0032] In order to make the personnel in the technical field better understand the utility model scheme, the technical scheme in the embodiment of the utility model will be clearly and completely described below in combination with the drawings.

[0033] It should be noted that the embodiments in the utility model and the features and technical solutions in the embodiments can be combined with each other without conflict.

[0034] It should be noted that: similar signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0035] The embodiment one of the utility model glass-based free-form surface mirror

[0036] Please refer to Figures 1-4 The utility model glass-based free-form surface mirror includes: the free-form surface mirror body 1 is provided with the reverse R corner 2 at the corner, the reverse R corner 2 is formed at the corner of the free-form surface mirror body 1 by chamfering the four corners of the free-form surface mirror body 1, the stress concentration part is cut off by the reverse R corner 2, thereby reducing the wrinkle and extension inside the stress concentration area; the stress is more evenly distributed in the heat bending process of the free-form surface mirror body 1 by the reverse R corner 2, thereby reducing the wrinkle problem caused by uneven stress; the reverse R corner 2 provides sufficient extension space for the free-form surface mirror body 1, so that the free-form surface mirror body 1 can better fit the mold shape in the heat bending process, thereby reducing the wrinkle.

[0037] In the process of thermal bending of the free-form mirror body 1, stress concentration is a key factor leading to wrinkle, and the stress of the traditional free-form mirror without the inverted R corner 2 is concentrated in the corner, which is easy to cause wrinkle, and affects the optical performance and appearance of the free-form mirror, by setting the inverted R corner 2, the stress concentration part is cut off, the stress is uniformly distributed, the generation of wrinkle is reduced, and the yield of the product is improved.

[0038] The application solves the problem of wrinkle in the four corners of the free-form glass in the thermal bending process in the following way:

[0039] The stress distribution of the extrusion of the free-form mirror body 1 is simulated by 3D software such as rhino software, and it is found through analysis that the stress usually occurs at the four corner positions, therefore, when the raw material of the free-form mirror body 1 is cut, the four corners of the raw material of the free-form mirror body 1 are provided with the inverted R corner 2, after the inverted R corner 2, the stress concentration part is cut off, and the state that the wrinkle occurs at the stress concentration position and extends inward will not occur.

[0040] Further, the surface peak-valley difference of the free-form mirror body 1 is less than or equal to 50 microns, and the surface peak-valley difference reflects the flatness of the surface of the free-form mirror body 1, for the optical free-form mirror body, the surface flatness directly affects the propagation and imaging effect of light, when the surface peak-valley difference is less than or equal to 50 microns, the surface of the free-form mirror body is more flat, the refraction and reflection of light on the surface of the free-form mirror body 1 are more regular, the scattering and aberration of light can be effectively reduced, and the clarity and contrast of imaging are improved.

[0041] Further, the roughness of the free-form mirror body 1 is less than or equal to 10 nm, and the lower roughness means that the surface of the free-form mirror body 1 is smoother, the smooth surface can reduce the scattering and diffuse reflection of light on the surface of the free-form mirror body 1, so that more light can pass through the free-form mirror body 1, and the optical transparency and gloss of the free-form mirror body 1 are improved, in actual application, the user can feel clearer and brighter visual effect, meanwhile, the smooth surface reduces the friction coefficient of the free-form mirror body 1 and external substances, dust and stains are not easy to adhere to the surface of the free-form mirror body 1, even if the free-form mirror body 1 is stained with stains, it is also easy to clean, which not only maintains the optical performance of the free-form mirror body 1, but also reduces the damage to the surface of the free-form mirror body 1 caused by friction in the cleaning process, and prolongs the service life of the free-form mirror body 1.

[0042] Embodiment two of the glass-based free-form mirror

[0043] Further, the radius range of the inverted R corner 2 is 0.5mm-2mm.

[0044] Further, the free-form surface mirror body 1 is made of optical glass material, which has high transparency, low dispersion, good optical uniformity and other characteristics. These characteristics enable the free-form surface mirror body 1 to accurately refract and reflect light in optical applications, reducing light loss and aberration, and ensuring good optical performance. At the same time, the optical glass has high chemical stability and can resist the corrosion of various chemicals. It can maintain its performance under different environmental conditions such as humidity, high temperature, acid and alkali, ensuring its long-term stable operation. In addition, the optical glass has high hardness and good wear resistance, which can resist friction and scratching in daily use, has strong anti-aging ability, and is not prone to performance degradation after long-term use, thereby prolonging the service life of the product.

[0045] Further, the refractive index of the optical glass material is in the range of 1.5-1.8.

[0046] Embodiment three of the glass-based free-form surface mirror of the utility model

[0047] Further, the surface of the free-form surface mirror body 1 is coated with a reflective film, which can effectively reduce the absorption and scattering of light on the surface of the free-form surface mirror body 1, reducing light loss. This means that more light can be accurately reflected to the target position according to the designed light path, forming a clear and sharp image. In the HUD system, this helps to reduce image blur and ghosting phenomenon, and improves the clarity and contrast of the image.

[0048] Embodiment four of the glass-based free-form surface mirror of the utility model

[0049] Further, the surface of the free-form surface mirror body 1 is provided with a hydrophobic coating, and the water contact angle of the hydrophobic coating is ≥110°, so as to improve the anti-fouling and waterproof performance of the free-form surface mirror body 1. The water contact angle of the hydrophobic coating is ≥110°, indicating that the coating has strong hydrophobicity. When water comes into contact with the hydrophobic coating, water droplets will roll off and not easily adhere. In this way, it is difficult for stains to adhere to the surface of the free-form surface mirror body 1, thereby playing a good anti-fouling role and prolonging the service life of the free-form surface mirror body 1. In addition, it is more convenient and fast to clean the free-form surface mirror body 1. Only a light wipe can remove the water droplets and stains on the surface, keeping the free-form surface mirror body 1 clean and maintaining its optical performance.

[0050] Further, the hydrophobic coating is a fluorosilane coating with a thickness of 50-200nm. The fluorosilane coating has good hydrophobicity and chemical stability, and can maintain its hydrophobicity effect for a long time. This coating can form a firm chemical bond with the surface of the free-form surface mirror body 1, has good bonding force, and is not easy to fall off.

[0051] The utility model discloses glass base free curved mirror's embodiment five

[0052] The utility model discloses glass base free curved mirror further, the surface of free curved mirror main part 1 is coated with antistatic coating, can effectively prevent dust adsorption, keep free curved mirror main part 1 surface clean, in daily use, free curved mirror main part 1 surface is easy to produce static electricity, and static electricity can adsorb dust particles in air, makes free curved mirror main part 1 surface to be stained with dust, and the existence of dust can influence the light transmittance and imaging quality of free curved mirror main part 1, reduces optical performance, and antistatic coating can neutralize the charge on the surface of free curved mirror main part 1, reduces static electricity generation, thereby effectively prevents dust adsorption, and free curved mirror main part 1 surface keeps clean, need not clean frequently, has reduced the damage that the cleaning process can cause to free curved mirror main part 1, simultaneously also saved the manpower and material resources cost needed for cleaning free curved mirror main part 1;

[0053] Antistatic coating can adopt metal oxide type antistatic coating, and common metal oxides such as indium tin oxide ITO, zinc oxide ZnO have good conductivity, when forming coating, electron can move in the lattice of metal oxide, and static electricity is led out, for example, indium tin oxide is a kind of widely used transparent conductive material, and a layer of indium tin oxide antistatic coating is plated on the surface of free curved mirror main part 1 by physical vapor deposition PVD etc., which can ensure the high transparency of free curved mirror main part 1, and effectively conduct static electricity.

[0054] Obviously, the above-described embodiments are only a part of the embodiments of the utility model, and are not all the embodiments, and the preferred embodiments of the utility model are given in the drawings, but do not limit the patent range of the utility model. The utility model can be realized in many different forms, and contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical scheme recorded in the foregoing specific embodiments can be modified, or part of the technical features can be replaced equivalently. Any equivalent structure made by using the contents of the utility model specification and drawings, directly or indirectly used in other related technical fields, is also within the patent protection range of the utility model.

Claims

1. A glass-based freeform mirror, characterized in that, include: The freeform mirror body (1) has chamfered corners (2) at its edges.

2. The glass-based freeform mirror according to claim 1, characterized in that, The surface peak-to-valley difference of the freeform mirror body (1) is ≤50μm.

3. The glass-based freeform mirror according to claim 2, characterized in that, The roughness of the freeform mirror body (1) is ≤10nm.

4. The glass-based freeform mirror according to claim 3, characterized in that, The radius of the chamfer (2) is in the range of 0.5mm-2mm.

5. The glass-based freeform mirror according to claim 4, characterized in that, The freeform mirror body (1) is made of optical glass material.

6. The glass-based freeform mirror according to claim 5, characterized in that, The refractive index of the optical glass material is in the range of 1.5-1.

8.

7. The glass-based freeform mirror according to claim 6, characterized in that, The surface of the freeform mirror body (1) is coated with a reflective film.

8. The glass-based freeform mirror according to claim 6, characterized in that, The surface of the freeform mirror body (1) is provided with a hydrophobic coating, the water contact angle of the hydrophobic coating being ≥110°, to improve the anti-fouling and waterproof performance of the freeform mirror body (1).

9. The glass-based freeform mirror according to claim 8, characterized in that, The hydrophobic coating is a fluorosilane-based coating with a thickness of 50-200 nm.

10. The glass-based freeform mirror according to claim 6, characterized in that, The surface of the freeform mirror body (1) is coated with an antistatic coating.

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