Optical lens, image capturing device and electronic device

Abstract

The present disclosure provides an optical lens, an image capturing device and an electronic device. The optical lens includes at least two optical lenses and at least one reflective element. The reflective element is made of a plastic material. The reflective element includes a reflective coating on a surface of the reflective element. The reflective coating includes at least three layers of different materials. The three layers are made of a first material, a second material and a third material, respectively. The first material mainly includes silver. The second material mainly includes titanium. The third material mainly includes chromium oxide. The layers made of the first material and the second material are between the layer made of the third material and the reflective element. In this way, the reflective element has a high-reflection coating combination and an excellent ability to reflect light rays in a high-efficiency turning light path. In addition, the reflective coating can effectively avoid film cracking.

Description

Technical Field

[0001] This disclosure relates to an optical lens and an image capturing device, and more particularly to an optical lens and an image capturing device with high reflectivity for use in electronic devices. Background Technology

[0002] Traditional reflective coatings are prone to defects such as film cracking due to improper material configuration or environmental factors. Furthermore, the reflective efficiency of reflective coatings is insufficient in both the visible and infrared regions, failing to achieve the desired reflective effect. Therefore, there is an urgent need to develop technologies with specific film layer combinations to overcome these problems. Summary of the Invention

[0003] The optical lens, imaging device, and electronic device disclosed herein, through the configuration of a combination of highly reflective coatings, have the ability to efficiently reflect light and deflect its path, and can effectively avoid the problem of film cracking caused by reflective coatings.

[0004] According to one embodiment of this disclosure, an optical lens is provided, comprising at least two optical lenses and at least one reflective element. The reflective element is a plastic reflective element, and includes a reflective coating located on one surface of the reflective element. The reflective coating comprises at least three layers of different materials, wherein the three layers are respectively made of a first material, a second material, and a third material. The first material comprises silver, the second material comprises titanium, and the third material comprises chromium oxide. The layers made of the first and second materials are located between the layer made of the third material and the reflective element. The reflective coating has an average reflectance of R80100 at wavelengths from 800 nm to 1000 nm, which satisfies the following condition: 97.5% ≤ R80100.

[0005] According to one embodiment of the present disclosure, an imaging device is provided, which includes an optical lens as described in the foregoing embodiments and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on an imaging surface of the optical lens.

[0006] According to one embodiment of the present disclosure, an electronic device is provided, which is a mobile device, and the electronic device includes an image capturing device as described in the foregoing embodiments.

[0007] When R80100 meets the above conditions, it can have excellent near-infrared reflection performance. Attached Figure Description

[0008] To make the above and other objects, features, advantages and embodiments of this disclosure more apparent and understandable, the accompanying drawings are described below:

[0009] Figure 1A A surface quality diagram of the reflective element for a comparative example;

[0010] Figure 1B A surface quality diagram of the reflective element in the first embodiment;

[0011] Figure 2 This is a graph showing the relationship between the reflectivity and wavelength of the reflective element in the first embodiment;

[0012] Figure 3A A schematic diagram illustrating an arrangement of optical path deflection elements in an optical lens in accordance with this disclosure;

[0013] Figure 3B A schematic diagram illustrating another configuration of the optical path deflection element in an optical lens according to this disclosure;

[0014] Figure 3C A schematic diagram illustrating one configuration of two optical path deflection elements in an optical lens according to the present disclosure;

[0015] Figure 3D A schematic diagram illustrating another configuration of the two optical path deflecting elements in an optical lens according to this disclosure; and

[0016] Figure 3E A schematic diagram illustrating another configuration of the optical path reversing element in an optical lens according to the present disclosure.

[0017] [Symbol Explanation]

[0018] R38105: Average reflectivity of reflective coating at wavelengths from 380 nm to 1050 nm

[0019] R4050: Average reflectivity of reflective coating at wavelengths from 400 nm to 500 nm

[0020] R4060: Average reflectivity of reflective coating at wavelengths from 400 nm to 600 nm

[0021] R4070: Average reflectivity of reflective coating at wavelengths from 400 nm to 700 nm

[0022] R40100: Average reflectivity of reflective coating at wavelengths from 400 nm to 1000 nm

[0023] R65105: Average reflectivity of reflective coating at wavelengths from 650 nm to 1050 nm

[0024] R70100: Average reflectivity of reflective coating at wavelengths from 700 nm to 1000 nm

[0025] R80100: Average reflectivity of reflective coating at wavelengths from 800 nm to 1000 nm

[0026] R90100: Average reflectivity of reflective coating at wavelengths from 900 nm to 1000 nm

[0027] R45: Reflectivity of reflective coating at a wavelength of 450 nm

[0028] R55: Reflectivity of reflective coating at a wavelength of 550 nm

[0029] R65: Reflectivity of reflective coating at a wavelength of 650 nm

[0030] R75: Reflectivity of reflective coating at a wavelength of 750 nm

[0031] R85: Reflectivity of reflective coating at a wavelength of 850 nm

[0032] R95: Reflectivity of reflective coating at a wavelength of 950 nm

[0033] R105: Reflectivity of reflective coating at a wavelength of 1050 nm

[0034] tLs: Total number of reflective coating layers

[0035] Tsi: Thickness of the film layer made of the fourth material

[0036] Tcr: Thickness of the film layer made of a third material

[0037] Tti: Thickness of the film layer made from the second material

[0038] Tag: Thickness of the film layer made from the first material

[0039] Tmo: Thickness of the film layer made of the fifth material

[0040] N4: Refractive index of the fourth material

[0041] N3: Refractive index of the third material

[0042] N2: Refractive index of the second material

[0043] N5: Refractive index of the fifth material

[0044] Ns: Refractive index of the reflective element

[0045] LF, LF1, LF2: Optical path switching elements

[0046] IMG: Imaging Surface

[0047] OA1: First optical axis

[0048] OA2: Second optical axis

[0049] OA3: Third optical axis

[0050] FL: Filter element

[0051] LG: Lens Group Detailed Implementation

[0052] This disclosure provides an optical lens comprising at least two optical lenses and at least one reflective element. The reflective element is made of a plastic material and includes a reflective coating on one surface of the reflective element. The reflective coating comprises at least three layers of different materials, wherein the three layers are respectively made of a first material, a second material, and a third material. The first material mainly comprises silver, the second material mainly comprises titanium, and the third material mainly comprises chromium oxide. The layers made of the first and second materials are located between the layer made of the third material and the reflective element.

[0053] Therefore, the reflective element configured in the optical lens disclosed herein has a highly reflective film layer combination and an excellent ability to deflect light paths with high efficiency, and can effectively avoid the problem of film cracking caused by reflective coating.

[0054] The reflective coating has an average reflectance of R80100 at wavelengths from 800 nm to 1000 nm, satisfying the condition 95.0% ≤ R80100, thereby exhibiting excellent near-infrared reflection performance. Furthermore, it can satisfy the following conditions: 95.5% ≤ R80100; 96.0% ≤ R80100; 96.5% ≤ R80100; 97.0% ≤ R80100; 97.5% ≤ R80100; 98.0% ≤ R80100; or 98.25% ≤ R80100.

[0055] The membrane layer made of the second material can be located between the membrane layer made of the third material and the membrane layer made of the first material, thereby effectively protecting the membrane layer made of the first material to avoid oxidation and membrane cracking.

[0056] The reflective coating may further include a film layer made of a fourth material, which mainly comprises silicon compounds, such as silicon oxide or silicon nitride, and the film layer made of a third material may be located between the fourth material and the film layer made of the first material, which helps to provide more effective scratch protection and oxidation resistance.

[0057] The reflective coating may further include a film layer made of a fifth material, which mainly comprises metal oxides, and the film layer made of the fifth material may be located between the film layer made of the first material and the reflective element, which helps to improve the adhesion between the film layer made of the first material and the reflective element.

[0058] The reflective coating has a reflectivity of R85 at a wavelength of 850 nm, which satisfies the following condition: 95.0% ≤ R85, thereby achieving excellent near-infrared reflection. Furthermore, it satisfies the following conditions: 95.5% ≤ R85; 96.0% ≤ R85; 96.5% ≤ R85; 97.0% ≤ R85; 97.5% ≤ R85; 98.0% ≤ R85; or 98.2% ≤ R85.

[0059] The reflective coating has an average reflectance of R40100 at wavelengths from 400 nm to 1000 nm, which satisfies the following condition: 95.0% ≤ R40100, thereby achieving excellent reflection of visible and near-infrared light. Furthermore, it satisfies the following conditions: 95.5% ≤ R40100; 96.0% ≤ R40100; 96.5% ≤ R40100; 97.0% ≤ R40100; or 98.0% ≤ R40100.

[0060] The total number of reflective coating layers is tLs, which can satisfy the following condition: 4 ≤ tLs. Through the complete combination of film layers, it can play a protective role and avoid film cracking.

[0061] Reflective elements can be components that have the function of reversing the optical path, such as prisms or mirrors. By configuring reflective coatings on appropriate reflective elements, high cost-effectiveness can be achieved.

[0062] Reflective elements can be located on the object side or image side of an optical lens. By configuring reflective elements in appropriate positions, it is possible to miniaturize the end product.

[0063] The reflective elements can be located between the optical lenses, and the appropriate configuration of the reflective elements helps to miniaturize the end product.

[0064] The reflective element can be positioned horizontally or rotatably on the image side of the optical lens, thereby achieving focusing and image stabilization effects.

[0065] The reflective coating has an average reflectance of R38105 at wavelengths from 380 nm to 1050 nm, which satisfies the following conditions: 95.0% ≤ R38105; 95.5% ≤ R38105; 96.0% ≤ R38105; 96.5% ≤ R38105; or 97.0% ≤ R38105. This results in excellent visible light reflection.

[0066] The reflective coating has an average reflectance of R4050 at wavelengths from 400 nm to 500 nm, which satisfies the following conditions: 94.0% ≤ R4050; 94.5% ≤ R4050; or 95.0% ≤ R4050. This results in excellent visible light reflection.

[0067] The reflective coating has an average reflectivity of R4060 at wavelengths from 400 nm to 600 nm, which satisfies the following conditions: 95.0% ≤ R4060; 95.5% ≤ R4060; or 96.0% ≤ R4060. This results in excellent visible light reflection.

[0068] The reflective coating has an average reflectivity of R4070 at wavelengths from 400 nm to 700 nm, which satisfies the following conditions: 95.0% ≤ R4070; 95.5% ≤ R4070; 96.0% ≤ R4070; or 96.5% ≤ R4070. This results in excellent visible light reflection.

[0069] The reflective coating has an average reflectance of R65105 at wavelengths from 650 nm to 1050 nm, which satisfies the following conditions: 95.0% ≤ R65105; 95.5% ≤ R65105; 96.0% ≤ R65105; 96.5% ≤ R65105; 97.0% ≤ R65105; 97.5% ≤ R65105; or 98.0% ≤ R65105. This results in excellent near-infrared light reflection.

[0070] The reflective coating has an average reflectance of R70100 at wavelengths from 700 nm to 1000 nm, which satisfies the following conditions: 95.0% ≤ R70100; 95.5% ≤ R70100; 96.0% ≤ R70100; 96.5% ≤ R70100; 97.0% ≤ R70100; 97.5% ≤ R70100; 98.0% ≤ R70100; or 98.2% ≤ R70100. This results in excellent near-infrared light reflection.

[0071] The reflective coating has an average reflectance of R90100 at wavelengths from 900 nm to 1000 nm, which satisfies the following conditions: 95.0% ≤ R90100; 95.5% ≤ R90100; 96.0% ≤ R90100; 96.5% ≤ R90100; 97.0% ≤ R90100; 97.5% ≤ R90100; 98.0% ≤ R90100; or 98.25% ≤ R90100. This results in excellent near-infrared light reflection.

[0072] The reflective coating has a reflectivity of R45 at a wavelength of 450 nm, which satisfies the following conditions: 94.0% ≤ R45; 94.5% ≤ R45; 95.0% ≤ R45; or 95.5% ≤ R45. This results in excellent visible light reflection.

[0073] The reflective coating has a reflectivity of R55 at a wavelength of 550 nm, which satisfies the following conditions: 95.0% ≤ R55; 95.5% ≤ R55; 96.0% ≤ R55; 96.5% ≤ R55; or 97.0% ≤ R55. This results in excellent visible light reflection.

[0074] The reflective coating has a reflectivity of R65 at a wavelength of 650 nm, which satisfies the following conditions: 95.0% ≤ R65; 95.5% ≤ R65; 96.0% ≤ R65; 96.5% ≤ R65; 97.0% ≤ R65; or 97.5% ≤ R65. This results in excellent visible light reflection.

[0075] The reflective coating has a reflectivity of R75 at a wavelength of 750 nm, which satisfies the following conditions: 95.0% ≤ R75; 95.5% ≤ R75; 96.0% ≤ R75; 96.5% ≤ R75; 97.0% ≤ R75; 97.5% ≤ R75; or 98.0% ≤ R75. This results in excellent near-infrared light reflection.

[0076] The reflective coating has a reflectivity of R95 at a wavelength of 950 nm, which satisfies the following conditions: 95.0% ≤ R95; 95.5% ≤ R95; 96.0% ≤ R95; 96.5% ≤ R95; 97.0% ≤ R95; 97.5% ≤ R95; 98.0% ≤ R95; or 98.25% ≤ R95. This results in excellent near-infrared light reflection.

[0077] The reflective coating has a reflectivity of R105 at a wavelength of 1050 nm, which satisfies the following conditions: 95.0% ≤ R105; 95.5% ≤ R105; 96.0% ≤ R105; 96.5% ≤ R105; 97.0% ≤ R105; 97.5% ≤ R105; 98.0% ≤ R105; or 98.2% ≤ R105. This results in excellent near-infrared light reflection.

[0078] The film made of the fourth material has a thickness of Tsi, which can meet the following conditions: 10 nm ≤ Tsi ≤ 100 nm; 20 nm ≤ Tsi ≤ 80 nm; or 40 nm ≤ Tsi ≤ 70 nm. This provides protection.

[0079] The film thickness made of the third material is Tcr, which can meet the following conditions: 5 nm ≤ Tcr ≤ 200 nm; 10 nm ≤ Tcr ≤ 150 nm; or 30 nm ≤ Tcr ≤ 100 nm. This provides protection and prevents oxidation.

[0080] The thickness of the film made from the second material is Tti, which can satisfy the following conditions: 1 nm ≤ Tti ≤ 50 nm; 10 nm ≤ Tti ≤ 40 nm; or 20 nm ≤ Tti ≤ 30 nm. This can avoid the problem of film cracking.

[0081] The thickness of the film layer made of the first material is Tag, which can meet the following conditions: 50 nm ≤ Tag ≤ 250 nm; 60 nm ≤ Tag ≤ 150 nm; or 80 nm ≤ Tag ≤ 100 nm. This can enhance the reflection effect.

[0082] The film layer made of the fifth material has a thickness of Tmo, which can meet the following conditions: 0 nm < Tmo ≤ 50 nm; 1 nm ≤ Tmo ≤ 30 nm; or Tmo ≤ 25 nm. This can enhance the adhesion between the film layer and the reflective element.

[0083] The fourth material has a refractive index of N4, which satisfies the following condition: N4 ≤ 1.6. This provides protection.

[0084] The refractive index of the third material is N3, which satisfies the following condition: N3 ≥ 2.0. This provides protection and prevents oxidation.

[0085] The refractive index of the second material is N2, which satisfies the following condition: N2 ≥ 2.0. This helps to prevent film cracking.

[0086] The fifth material has a refractive index of N5, which satisfies the following condition: 1.6 ≤ N5 ≤ 1.7. This enhances the adhesion between the film layer and the reflective element.

[0087] The refractive index of the reflective element is Ns, which satisfies the following condition: Ns ≤ 1.7. This effectively controls costs.

[0088] The thickness ratio of the film layer made of the first material to the film layer made of the fifth material is Tag / Tmo, which can satisfy the following conditions: 1 ≤ Tag / Tmo ≤ 10; 2 ≤ Tag / Tmo ≤ 8; or 3 ≤ Tag / Tmo ≤ 7. This enhances the adhesion between the film layer and the reflective element and maintains high reflectivity.

[0089] The thickness ratio of the film layer made of the first material to the film layer made of the second material is Tag / Tti, which can satisfy the following conditions: 1 ≤ Tag / Tti ≤ 10; 2 ≤ Tag / Tti ≤ 8; or 3 ≤ Tag / Tti ≤ 7. This avoids film cracking and enhances the reflection effect.

[0090] The thickness ratio of the membrane layer made of the third material to the membrane layer made of the second material is Tcr / Tti, which can satisfy the following conditions: 1 ≤ Tcr / Tti ≤ 10; 1 ≤ Tcr / Tti ≤ 5; or 1 ≤ Tcr / Tti ≤ 3. This provides protection and prevents membrane cracking.

[0091] The ratio of the total thickness of the film made from the third and second materials to the thickness of the film made from the first material is (Tcr + Tti) / Tag, which satisfies the following conditions: 0 < (Tcr + Tti) / Tag ≤ 1.00; 0.10 ≤ (Tcr + Tti) / Tag ≤ 0.80; or 0.25 ≤ (Tcr + Tti) / Tag ≤ 0.70. This provides protection, preventing oxidation, preventing film cracking, and enhancing reflectivity.

[0092] The thickness ratio of the film layer made of the fourth material to the film layer made of the third material is Tsi / Tcr, which can satisfy the following conditions: 1 ≤ Tsi / Tcr ≤ 5; 1 ≤ Tsi / Tcr ≤ 3; or 1 ≤ Tsi / Tcr ≤ 2. This provides protection and prevents oxidation.

[0093] The optical lens disclosed herein may have a long-wavelength filtering coating on the surface of the optical lens. The long-wavelength filtering coating is a multilayer thin film deposited on the surface of a plastic material. It uses physical vapor deposition methods, such as evaporation deposition or sputtering deposition, or chemical vapor deposition methods, such as ultra-high vacuum chemical vapor deposition, microwave plasma-assisted chemical vapor deposition, or plasma-enhanced chemical vapor deposition.

[0094] The optical lens disclosed herein may incorporate an absorbing material within the optical lens element to achieve better absorption uniformity and consistent color uniformity across all fields of view. The optical lens element may contain a long-wavelength absorbing material, which is mixed and uniformly distributed within the plastic material of the optical lens element. This long-wavelength absorbing material must withstand the high temperatures of the injection molding process without decomposition to maintain the desired long-wavelength absorption effect. The optical lens may also contain a short-wavelength absorbing material, which is mixed and uniformly distributed within the plastic material of the optical lens element. This short-wavelength absorbing material must also withstand the high temperatures of the injection molding process without decomposition to maintain the desired short-wavelength absorption effect. The long-wavelength range defined in this disclosure refers to the region with wavelengths above 500 nm, and the short-wavelength range refers to the region with wavelengths below 500 nm.

[0095] The reflectivity data disclosed herein are generally for a single reflective element. If the reflective coating is applied to multiple reflective elements or multiple surfaces, the reflectivity data can be the combined data after passing through multiple reflective elements or multiple surfaces.

[0096] Plastic optical lenses suffer from significant surface shape changes due to high temperatures. The more layers of reflective coating there are, the more pronounced the temperature-induced surface shape accuracy becomes. Lens correction technology can effectively address the temperature effect during the coating process of plastic optical lenses, helping to maintain the integrity of the coating and the high precision of plastic optical lenses. This is a key technology for achieving high-quality optical lenses.

[0097] Optical lens correction techniques can employ methods such as moldflow analysis, curve fitting, and wavefront error analysis, but are not limited to these. Moldflow analysis identifies the Z-axis contraction nodes of the optical lens surface through moldflow analysis, converts them into aspherical curves, and compares the differences with the original curves. It also considers the material shrinkage rate and surface deformation trend of the optical lens to calculate the correction value. Curve fitting measures the contour error of the optical lens surface, fits a function to a curve, and uses an optimization algorithm to approximate the fitted curve to the measurement points to obtain the correction value. The function can be exponential or polynomial, and the algorithm can be Gauss-Newton's method, simplex algorithm, or the Steepest Descent method. Wavefront error analysis measures the wavefront error (imaging error) data of the optical lens using an interferometer. It then analyzes the wavefront error generated during manufacturing and assembly, using the original design wavefront error as a comprehensive analysis, and finally optimizes the result using optical software to obtain the correction value.

[0098] The optical lens disclosed herein can also selectively incorporate at least one element with a light-path-deflecting function, such as a prism or mirror, between the subject and the imaging plane in the optical path. This provides greater spatial flexibility in the optical lens configuration, allowing the thinner and lighter electronic devices to be made less constrained by the overall optical length of the lens. For further explanation, please refer to... Figure 3A as well as Figure 3B ,in Figure 3A A schematic diagram illustrating one configuration of the optical path deflection element LF in an optical lens according to this disclosure is provided. Figure 3B A schematic diagram illustrating another configuration of the optical path deflector element LF in an optical lens according to this disclosure is shown. Figure 3A as well as Figure 3B As shown, the optical lens can travel along the light path from the subject (not shown) to the imaging plane IMG, and sequentially includes a first optical axis OA1, a light path deflection element LF, a second optical axis OA2, and a filter element FL. The light path deflection element LF is positioned between the subject and the lens group LG of the optical lens, and the incident and exit surfaces of the light path deflection element LF can be... Figure 3A The image shown is planar, or as... Figure 3B The surface shown is curved. Additionally, please refer to... Figure 3C as well as Figure 3D ,in Figure 3C A schematic diagram illustrating one configuration of the two optical path deflection elements LF1 and LF2 in an optical lens according to this disclosure is shown. Figure 3D A schematic diagram illustrating another configuration of the two optical path deflecting elements LF1 and LF2 in an optical lens according to this disclosure is shown. Figure 3C as well as Figure 3D As shown, the optical lens can also travel along the light path from the subject (not shown) to the imaging plane IMG, and sequentially includes a first optical axis OA1, a light path reversing element LF1, a second optical axis OA2, a filter element FL, a light path reversing element LF2, and a third optical axis OA3. The light path reversing element LF1 is positioned between the subject and the lens group LG of the optical lens, and the light path reversing element LF2 is positioned between the lens group LG of the optical lens and the imaging plane IMG. Furthermore, the light path reversing element LF2 can... Figure 3C The image shown is of a prism, or as... Figure 3D The image shown is of a reflecting mirror. Additionally, please refer to... Figure 3E ,in Figure 3E A schematic diagram illustrating another configuration of the optical path deflector element LF in an optical lens according to this disclosure is shown. Figure 3EAs shown, the optical lens can also travel along the light path from the subject (not shown) to the imaging plane IMG, and sequentially includes a first optical axis OA1, a filter element FL, a light path deflection element LF, a second optical axis OA2, and a third optical axis OA3. The light path deflection element LF is positioned between the lens group LG and the imaging plane IMG, and the light path can be as follows... Figure 3E The optical path reversal element LF is shown to perform a secondary reversal. Optical lenses may also selectively be configured with more than three optical path reversal elements. This disclosure is not limited to the type, number, and position of the optical path reversal elements disclosed in the accompanying drawings.

[0099] This disclosure provides an image capturing device, which includes the aforementioned optical lens and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on an imaging surface of the optical lens.

[0100] This disclosure provides an electronic device, which is a mobile device, and the electronic device includes the aforementioned image capturing device.

[0101] This disclosure provides an electronic device that includes the aforementioned image capturing device. This improves image quality. Preferably, the aforementioned electronic device may further include a control unit, a display unit, a storage unit, a random access memory, or a combination thereof.

[0102] The optical lenses disclosed herein can also be used in various electronic devices such as 3D image capture, digital cameras, mobile products, digital tablets, smart TVs, network monitoring equipment, motion-sensing game consoles, dashcams, reversing cameras, wearable products, or drones.

[0103] The image capturing device is a camera module, comprising an imaging lens, a driving mechanism assembly, and an electronic image sensor. The imaging lens includes the optical lens disclosed herein and a lens barrel supporting the optical lens. The image capturing device uses the imaging lens to focus light and capture an image of the subject, and works with the driving mechanism assembly to focus the image, finally imaging it onto the electronic image sensor and outputting the image data.

[0104] The image acquisition device can be a wide-angle image acquisition device, an ultra-wide-angle image acquisition device, a telescopic image acquisition device (which may include an optical path deflection element), or a TOF module (Time-Of-Flight); however, it is not limited to this configuration. In addition, the connection relationship between the image acquisition device and other components can be adapted according to the type of image acquisition device, which will not be shown or described in detail here.

[0105] The drive unit assembly can be an autofocus module, and its driving method can use drive systems such as voice coil motors, microelectromechanical systems, piezoelectric systems, or shape memory metals. The drive unit allows the optical lens to achieve a better imaging position, enabling clear images to be captured even when the subject is at different object distances.

[0106] The image capture device can be equipped with a high-sensitivity, low-noise electronic image sensor (such as CMOS or CCD) positioned on the imaging surface of the optical lens, thus accurately reflecting the excellent image quality of the optical lens. Furthermore, the image capture device may include an image stabilization module, which can be a kinetic sensing element such as an accelerometer, gyroscope, or Hall effect sensor, but is not limited to these. By adjusting the changes in different axes of the optical lens to compensate for the blur caused by camera shake during shooting, the image quality for shooting in dynamic and low-light scenes is further improved, and advanced image compensation functions such as optical image stabilization (OIS) and electronic image stabilization (EIS) are provided.

[0107] The electronic device is a smartphone, comprising an image capture device, a flash module, a focus assist module, an image signal processor (ISP), a user interface, and an image software processor. The image capture device can be a front-facing or rear-facing camera. When the user takes a picture of a subject through the user interface, the electronic device uses the image capture device to focus light, activates the flash module for fill light, and uses the subject distance information provided by the focus assist module for fast focusing. The image signal processor and image software processor then perform image optimization processing to further improve the image quality produced by the camera lens. The focus assist module can use an infrared or laser focus assist system to achieve fast focusing. The user interface can be a touchscreen or a physical shutter button, combined with the diverse functions of the image processing software for image capture and processing.

[0108] The image-capturing device can capture an image through a non-circular opening on the outside of the electronic device.

[0109] Based on the above description, specific embodiments are described in detail below.

[0110] <First Embodiment>

[0111] The first embodiment is an optical lens comprising two optical lenses and a reflective element. From the object side to the image side of the optical path, the lenses are sequentially a first optical lens, a second optical lens, and the reflective element. Each optical lens has an object-side surface facing the object side and an image-side surface facing the image side. The reflective element is made of a plastic material and includes a reflective coating located on one surface of the reflective element. In the first embodiment, the reflective coating comprises five layers, which are sequentially made of a fourth material, a third material, a second material, a first material, and a fifth material from the side closest to air to the side closest to the reflective element. The fourth material is silicon dioxide (SiO2), and the third material is chromium oxide (CrO2). x The second material is titanium (Ti), the first material is silver (Ag), and the fifth material is a metal oxide.

[0112] The comparative example of the reflective coating comprises four layers, which are made of silicon dioxide, chromium oxide, chromium (Cr) and silver respectively, from the side closest to the air to the side closest to the reflective element.

[0113] The detailed configuration of the reflective coating in the first embodiment and the comparative example is listed in Table 1 below.

[0114]

[0115] Furthermore, the properties of each layer of the reflective coating in the first embodiment, such as refractive index and thickness, are listed in Table 2 below.

[0116]

[0117] Please refer to the above as well. Figure 1A and Figure 1B , Figure 1A This is a surface quality diagram of the reflective element for a comparative example. Figure 1B This is a surface quality diagram of the reflective element in the first embodiment. Figure 1A and Figure 1B As can be seen, the comparative example exhibits film cracking on the surface of the reflective element, while the first embodiment, by appropriately configuring film layers of different materials, ensures that the surface of the reflective element remains intact and free from film cracking.

[0118] Please refer to Table 3 as well. Figure 2 , Figure 2 The graph shows the relationship between the reflectivity and wavelength of the reflective element in the first embodiment, and the reflectivity measurement results of the reflective element in the first embodiment at different wavelengths are listed in Table 3 below.

[0119]

[0120] As can be seen from the results in Table 3 above, the reflective element of the first embodiment can effectively reflect light of different wavelengths for both visible and near-infrared light, and its reflection effect is quite excellent, which helps to avoid the problem of film cracking on the reflective coating on the reflective element.

[0121] The optical lens of the embodiments disclosed herein may also include three optical lenses and one reflective element, four optical lenses and one reflective element, five optical lenses and one reflective element, six optical lenses and one reflective element, seven optical lenses and one reflective element, eight optical lenses and one reflective element, nine optical lenses and one reflective element, ten optical lenses and one reflective element, and so on; it may also include three optical lenses and two reflective elements, four optical lenses and two reflective elements, five optical lenses and two reflective elements, six optical lenses and two reflective elements, seven optical lenses and two reflective elements, eight optical lenses and two reflective elements, nine optical lenses and two reflective elements, ten optical lenses and two reflective elements, and so on; it may also include three optical lenses and three reflective elements, four optical lenses and three reflective elements, five optical lenses and three reflective elements, six optical lenses and three reflective elements, seven optical lenses and three reflective elements, eight optical lenses and three reflective elements, nine optical lenses and three reflective elements, ten optical lenses and three reflective elements, and so on.

[0122] Although the present disclosure has been presented above with reference to embodiments, it is not intended to limit the present disclosure. Any person skilled in the art may make various modifications and alterations without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of the present disclosure shall be determined by the scope defined in the appended claims.

Claims

1. An optical lens, characterized in that, Include: At least two optical lenses; and At least one reflective element; The reflective element is a plastic reflective element, and the reflective element includes a reflective coating located on one surface of the reflective element; The reflective coating comprises at least three layers of different materials, each layer being made of a first material, a second material, and a third material. The first material comprises silver, the second material comprises titanium, and the third material comprises chromium oxide. The layers made of the first material and the second material are located between the layer made of the third material and the reflective element. The reflective coating has an average reflectance of R80100 at wavelengths from 800 nm to 1000 nm, which satisfies the following conditions: 97.5% ≤ R80100。 2. The optical lens according to claim 1, characterized in that, The membrane layer made of the second material is located between the membrane layers made of the third material and the membrane layers made of the first material.

3. The optical lens according to claim 2, characterized in that, The reflective coating further includes a film layer made of a fourth material comprising a silicon compound, and the film layer made of the third material is located between the fourth material and the film layers made of the first material.

4. The optical lens according to claim 3, characterized in that, The reflective coating further includes a film layer made of a fifth material comprising a metal oxide, and the film layer made of the fifth material is located between the film layer made of the first material and the reflective element.

5. The optical lens according to claim 3, characterized in that, The reflective coating has an average reflectance of R40100 at wavelengths from 400 nm to 1000 nm, which satisfies the following conditions: 98.0% ≤ R40100。 6. The optical lens according to claim 4, characterized in that, The reflective coating has a reflectance of R85 at a wavelength of 850 nm, which satisfies the following condition: 98.0% ≤ R85。 7. The optical lens according to claim 5, characterized in that, The total number of layers in the reflective coating is tLs, which satisfies the following condition: 4 ≤ tLs.

8. The optical lens according to claim 1, characterized in that, The reflective element is located on the object side or image side of the optical lens.

9. The optical lens according to claim 1, characterized in that, The reflective element is located between the at least two optical lenses.

10. The optical lens according to claim 7, characterized in that, The reflecting element is a prism or a mirror.

11. The optical lens according to claim 1, characterized in that, The reflective element is movably or rotatably positioned on the image side of the optical lens.

12. An image capturing device, characterized in that, Include: The optical lens as described in claim 1; and An electronic photosensitive element is disposed on an imaging surface of the optical lens.

13. An electronic device, characterized in that, The electronic device is a mobile device, and the electronic device includes: The imaging device as described in claim 12.

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