De-polarization partial reflection film

Abstract

The utility model relates to a depolarization partial reflection film, which comprises a depolarization partial reflection film main body, the depolarization partial reflection film main body comprises nine film layers, and the nine film layers are sequentially plated on the surface of a resin lens from the first layer to the ninth layer from inside to outside. The nine film layers comprise an aluminum oxide film layer, two silver film layers, three magnesium oxide film layers, two silicon dioxide film layers and an anti-fingerprint film layer. According to the utility model, P reflected light is as high as possible and S reflected light is as low as possible in a specific incident angle range, so that the polarization effect of the reflected light in a working wave band and an incident angle is effectively eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of reflective films, in particular to a depolarized partial reflective film. Background Art

[0002] In recent years, HUD head-up display systems have begun to be widely used in automobiles. Compared with the mainstream LCD instrument panels at this stage, they can indeed give drivers a safer and more interactive driving experience to a certain extent. C-HUD (Combiner Head-Up Display) combined head-up display, the optical imaging system of this type of HUD head-up display system is a resin lens, which is used to receive and reflect the picture from the image generation unit PGU. The resin lens needs to be plated with a partial reflective film (semi-transparent and semi-reflective film) through PVD to display driving information, so that the driver can see the driving information without blocking the driving line of sight. Due to the Fresnel effect of light, the reflectivity of light increases with the increase of the incident angle and a polarization effect will occur. In the range of incident angles of 30° to 60°, S polarized light is always higher than P polarized light and the difference increases with the increase of the incident angle, which will affect the driver and make it easy for the driver to see the driving information displayed on the C-HUD, affecting driving safety. Utility Model Content

[0003] The utility model aims to provide a depolarized partial reflection film, which can realize that the P reflected light is as high as possible and the S reflected light is as low as possible within a specific incident angle range, and effectively eliminates the polarization effect of the reflected light in the working band and incident angle.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a depolarizing partial reflective film, comprising a depolarizing partial reflective film body, wherein the depolarizing partial reflective film body comprises nine film layers, which are sequentially plated on the surface of the lens from the first layer to the ninth layer from the inside to the outside, wherein the nine film layers comprise an aluminum oxide film layer, two silver film layers, three magnesium oxide film layers, two silicon dioxide film layers, and an anti-fingerprint film layer.

[0005] Furthermore, the first layer of the nine film layers is an aluminum oxide film layer, the second layer is a silver film layer, the third layer is a magnesium oxide film layer, the fourth layer is a silicon dioxide film layer, the fifth layer is a magnesium oxide film layer, the sixth layer is a silver film layer, the seventh layer is a magnesium oxide film layer, the eighth layer is a silicon dioxide film layer, and the ninth layer is an anti-fingerprint AF film layer.

[0006] Furthermore, the thickness of the first layer is 39.90±0.1nm, the thickness of the second layer is 5.46±0.1nm, the thickness of the third layer is 23.01±0.1nm, the thickness of the fourth layer is 81.33±0.1nm, the thickness of the fifth layer is 55.38±0.1nm, the thickness of the sixth layer is 18.26±0.1nm, the thickness of the seventh layer is 33.01±0.1nm, the thickness of the eighth layer is 30.00±0.1nmnm, and the thickness of the ninth layer is 10.00±0.1nm.

[0007] Furthermore, the refractive index of the aluminum oxide film layer is 1.62-1.67, the refractive index of the magnesium oxide film layer is 1.7-1.8, the refractive index of the silicon dioxide film layer is 1.43-1.47, and the refractive index of the anti-fingerprint AF film layer is 1.48-1.5.

[0008] Furthermore, the lens is made of resin.

[0009] Beneficial effects of the utility model: The utility model proposes a depolarizing partial reflective film applied to a C-HUD (Combiner Head-Up Display) combined head-up display system. Through the combined design of metal and dielectric films, the P light reflectivity is much higher than the S light reflectivity at a wavelength of 400nm-700nm and an incident angle of 30-45°, effectively eliminating the polarization effect of the reflected light in the working band and incident angle, greatly improving the P light reflectivity, reducing the S light reflectivity, improving the clarity of the C-HUD display system imaging, and reducing the visual impact of stray light. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The first-order and second-order sensitivities of the depolarizing partial reflection film of the utility model;

[0011] Figure 2 Designing a reflectivity curve for the depolarized partial reflective film of the utility model;

[0012] Figure 3 It is a schematic diagram of the structure of the depolarized partial reflective film of the utility model;

[0013] Figure 4 This is the chromaticity diagram of reflected light at an incident angle of 30° for the depolarized partial reflective film of the utility model;

[0014] Figure 5 This is the chromaticity diagram of reflected light of the depolarized partial reflective film of the utility model at an incident angle of 35°;

[0015] Figure 6 This is the chromaticity diagram of the reflected light of the depolarized partial reflective film of the utility model at an incident angle of 40°;

[0016] Figure 7 This is the chromaticity diagram of reflected light of the depolarized partial reflective film of the utility model at an incident angle of 45°.

[0017] Among them: 1. lens, 2. first layer, 3. second layer, 4. third layer, 5. fourth layer, 6. fifth layer, 7. sixth layer, 8. seventh layer, 9. eighth layer, 10. ninth layer. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings.

[0019] See also Figures 1 to 7 The utility model provides an embodiment: a depolarizing partial reflection film, including a depolarizing partial reflection film body, the depolarizing partial reflection film body includes nine film layers, from the first layer 2 to the ninth layer 10, which are sequentially plated on the surface of the lens 1 from the inside to the outside, and the nine film layers include an aluminum oxide film layer, two silver film layers, three magnesium oxide film layers, two silicon dioxide film layers, and an anti-fingerprint film layer. Through the combination of metal and dielectric thin films, the polarization phenomenon is eliminated through thin film interference, the P reflected light is increased and the S reflected light is reduced.

[0020] Please continue reading Figure 3 As shown, in one embodiment of the utility model, the first layer 2 of the nine film layers is an aluminum oxide film layer, the second layer 3 is a silver film layer, the third layer 4 is a magnesium oxide film layer, the fourth layer 5 is a silicon dioxide film layer, the fifth layer 6 is a magnesium oxide film layer, the sixth layer 7 is a silver film layer, the seventh layer 8 is a magnesium oxide film layer, the eighth layer 9 is a silicon dioxide film layer, and the ninth layer 10 is an anti-fingerprint AF film layer. The aluminum oxide film has excellent chemical stability, can resist various chemical corrosion, and enhance the chemical stability of the lens 1. The silver-plated film layer can highly reflect light, and the magnesium oxide film layer provides a clear and damage-free visual effect. The coating used on the surface of the lens 1 has strong anti-reflective properties, which can significantly improve the permeability of light. The silicon dioxide film layer can reduce surface reflection, improve light transmittance, enhance imaging effects, and improve wear resistance. The anti-fingerprint film layer has anti-fingerprint, wear-resistant, and scratch-resistant effects.

[0021] Please continue reading Figures 1 to 7As shown, in one embodiment of the utility model, the thickness of the first layer 2 is 39.90±0.1nm, the thickness of the second layer 3 is 5.46±0.1nm, the thickness of the third layer 4 is 23.01±0.1nm, the thickness of the fourth layer 5 is 81.33±0.1nm, the thickness of the fifth layer 6 is 55.38±0.1nm, the thickness of the sixth layer 7 is 18.26±0.1nm, the thickness of the seventh layer 8 is 33.01±0.1nm, the thickness of the eighth layer 9 is 30.00±0.1nmnm, and the thickness of the ninth layer 10 is 10.00±0.1nm.

[0022] Please continue reading Figures 1 to 7 As shown, in one embodiment of the utility model, the refractive index of the aluminum oxide film layer is 1.62-1.67, the refractive index of the magnesium oxide film layer is 1.7-1.8, the refractive index of the silicon dioxide film layer is 1.43-1.47, and the refractive index of the anti-fingerprint AF film layer is 1.48-1.5. When the test wavelength is 550nm and the light incident angle is 30°-45°, the utility model preferably has a refractive index of 1.65 for the aluminum oxide film layer, a refractive index of 1.7 for the magnesium oxide film layer, a refractive index of 1.46 for the silicon dioxide film layer, a refractive index of 1.49 for the anti-fingerprint AF film layer, and a refractive index of 1.59 for the lens 1.

[0023] Please continue reading Figures 1 to 7 As shown, in one embodiment of the present invention, the lens 1 is made of resin.

[0024] according to Figure 1 As shown in the figure, the horizontal axis represents different film layers, and the vertical axis represents the sensitivity coefficient of the film layer. The larger the sensitivity coefficient, the more sensitive the film layer is to the thickness error. It can be seen from the figure that the sensitivity coefficients of the 9 film layers are all in the order of 10-4, which is relatively low. There is a good tolerance for the thickness error of the film layer in production, which is conducive to the stability of production.

[0025] according to Figure 2 As shown, through the combined design of metal and dielectric films, a wavelength of 400nm-700nm, an incident angle of 30-45°, an average reflectivity of 24.15%, a P light reflectivity of 28%, and an S light reflectivity of 20.3% are achieved. The P light reflectivity is much higher than the S light reflectivity, which effectively eliminates the polarization effect of the reflected light in the working band and incident angle, greatly improves the P light reflectivity, reduces the S light reflectivity, improves the clarity of the C-HUD display system imaging, and reduces the visual impact of stray light.

[0026] according to Figures 4 to 7 As shown, Figures 4 to 7They represent the visual color appearance at the angles, and it can be seen that at different incident angles, the reflected light has high consistency and no obvious color cast, so that the lens 1 can achieve a light gray appearance at different observation angles.

[0027] The utility model has the following working principle: Based on improving the optical performance of the resin lens in the C-HUD head-up display system, the utility model proposes a depolarizing partial reflection film, the depolarizing partial reflection film body includes nine film layers, which are sequentially deposited on the surface of the PC lens from one to nine, and the nine film layers include one aluminum oxide (AL2O3) film layer, two silver (AG) film layers, three magnesium oxide (MGO) film layers, two silicon dioxide (SIO2) film layers, and one anti-fingerprint (AF) film layer. Through the combination of metal and medium thin films, the polarization phenomenon is eliminated through thin film interference, the P reflected light is increased and the S reflection is reduced, the clarity of the C-HUD display system imaging is improved, and the visual impact of stray light is reduced.

[0028] The above description is only a preferred embodiment of the present utility model and cannot be understood as a limitation of the present application. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall fall within the scope of the present utility model.

Claims

1. A depolarizing partial reflection film, characterized in that: It includes a depolarizing partial reflective film body, which includes nine film layers, which are sequentially plated on the surface of the lens from the inside to the outside from the first layer to the ninth layer, and the nine film layers include an aluminum oxide film layer, two silver film layers, three magnesium oxide film layers, two silicon dioxide film layers, and an anti-fingerprint film layer.

2. A depolarizing partial reflective film according to claim 1, characterized in that: The first layer of the nine film layers is an aluminum oxide film layer, the second layer is a silver film layer, the third layer is a magnesium oxide film layer, the fourth layer is a silicon dioxide film layer, the fifth layer is a magnesium oxide film layer, the sixth layer is a silver film layer, the seventh layer is a magnesium oxide film layer, the eighth layer is a silicon dioxide film layer, and the ninth layer is an anti-fingerprint AF film layer.

3. A depolarizing partial reflective film according to claim 1, characterized in that: The thickness of the first layer is 39.90±0.1nm, the thickness of the second layer is 5.46±0.1nm, the thickness of the third layer is 23.01±0.1nm, the thickness of the fourth layer is 81.33±0.1nm, the thickness of the fifth layer is 55.38±0.1nm, the thickness of the sixth layer is 18.26±0.1nm, the thickness of the seventh layer is 33.01±0.1nm, the thickness of the eighth layer is 30.00±0.1nmnm, and the thickness of the ninth layer is 10.00±0.1nm.

4. A depolarizing partial reflective film according to claim 2, characterized in that: The refractive index of the aluminum oxide film layer is 1.62-1.67, the refractive index of the magnesium oxide film layer is 1.7-1.8, the refractive index of the silicon dioxide film layer is 1.43-1.47, and the refractive index of the anti-fingerprint AF film layer is 1.48-1.

5.

5. The depolarizing partial reflective film according to claim 1, characterized in that: The lens is made of resin.

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