TWI823325B - Optical lens assembly, imaging apparatus and electronic device - Google Patents

Abstract

According to the present disclosure, an optical lens assembly includes at least two optical lens elements and at least one reflective element. The reflective element is made of a plastic material and includes a reflective coating and a substrate. The reflective coating is disposed on a surface of the substrate. The reflective coating includes at least three coating layers of different materials. Three of the coating 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, and the third material mainly includes chromium oxides. The coating layers made of the first material and the second material are disposed between the coating layer made of the third material and the substrate. Therefore, the reflective element includes a configuration of coating layers which has high reflective effect, and has an excellent ability of effectively reflecting lights to fold a light path. It is able to effectively prevent the reflective coating from being cracked.

Description

Optical lenses, imaging devices and electronic devices

The present disclosure relates to an optical lens and an image capturing device, and in particular, to an optical lens and an image capturing device that are used in electronic devices and have a high reflective effect.

The reflective coating of traditional reflective elements is prone to film crack defects due to improper material configuration of the film layer or environmental factors. Moreover, the reflection efficiency of the reflective coating is insufficient in both the visible light region and the infrared region, and cannot meet the requirements. Reflection effect, so there is an urgent need to develop technology with specific film layer combination configurations to overcome the above problems.

The optical lens, imaging device and electronic device provided in this disclosure have the ability to turn the light path of reflected light with excellent and high efficiency by configuring a combination of film layers with high reflective effects, and can effectively avoid the problem of film cracks in the reflective coating.

R80100。 According to an embodiment of the present disclosure, an optical lens is provided, which includes at least two optical lenses and at least one reflective element. The reflective element is made of plastic material. The reflective element includes a reflective coating and a base material. The reflective coating is located on a surface of the base material. The reflective coating includes at least three film layers of different materials. The three film layers are respectively made of a first material, a second material and a third material. The first material mainly includes silver, the second material mainly includes titanium, and the third material mainly includes titanium. It contains chromium oxide, and the film layer made of the first material and the second material is located between the film layer made of the third material and the substrate. The average reflectance of the reflective coating at wavelengths from 800nm to 1000nm is R80100, which meets the following conditions: 97.5%

R80100.

According to the optical lens of the aforementioned embodiment, the film layer made of the second material may be located between the film layer made of the third material and the first material.

According to the optical lens of the aforementioned embodiment, the reflective coating may further include a film layer made of a fourth material. The fourth material mainly includes a silicon compound, and the film layer made of the third material may be located between the fourth material and the third material. between layers of film made of a material.

According to the optical lens of the aforementioned embodiment, the reflective coating may further include a film layer made of a fifth material. The fifth material mainly includes metal oxide, and the film layer made of the fifth material may be located on the first material. between the formed film layer and the substrate.

R40100。 According to the optical lens of the aforementioned embodiment, the average reflectance of the reflective coating at wavelengths from 400nm to 1000nm is R40100, which can meet the following conditions: 98.0%

R40100.

According to the optical lens of the aforementioned embodiment, the reflectivity of the reflective coating at a wavelength of 850 nm is R85, which can meet the following conditions: 98.0% ≤ R85.

According to the optical lens of the aforementioned embodiment, the total number of reflective coating layers is tLs, which can satisfy the following conditions: 4 ≤ tLs.

According to the optical lens of the aforementioned embodiment, the reflective element may be located on the object side or the image side of the optical lens.

According to the optical lens of the aforementioned embodiment, the reflective element may be located between at least two optical lenses.

According to the optical lens of the aforementioned embodiment, the reflective element may be a lens or a reflective mirror.

According to the optical lens of the aforementioned embodiment, the reflective element is disposed on the image side of the optical lens in a horizontally movable or rotatable manner.

According to one embodiment of the present disclosure, an imaging device is provided, which includes the optical lens of the aforementioned embodiment and an electronic photosensitive element, and the electronic photosensitive element is disposed on an imaging surface of the optical lens.

According to an embodiment of the present disclosure, an electronic device is provided, which is a mobile device, and the electronic device includes the imaging device as in the foregoing embodiment.

When R80100 meets the above conditions, it can have excellent near-infrared reflection effect.

The present disclosure provides an optical lens, which includes at least two optical lenses and at least one reflective element. The reflective element is made of plastic material. The reflective element includes a reflective coating and a base material. The reflective coating is located on a surface of the base material. The reflective coating includes at least three film layers of different materials. The three film layers are respectively made of a first material, a second material and a third material. The first material mainly includes silver, the second material mainly includes titanium, and the third material mainly includes titanium. It contains chromium oxide, and the film layer made of the first material and the second material is located between the film layer made of the third material and the substrate.

Therefore, the reflective element configured in the optical lens of the present disclosure has The film combination has a high reflective effect and has the ability to turn the light path of reflected light with excellent high efficiency. It can also effectively avoid the problem of film cracks in the reflective coating.

R80100，藉此，可以具有優異的反射近紅外線效果。再者，其可滿足下列條件：95.5%

R80100；96.0%

R80100；96.5%

R80100；97.0%

R80100；97.5%

R80100；98.0%

R80100；或98.25%

R80100。 The average reflectance of the reflective coating at wavelengths from 800nm to 1000nm is R80100, which meets the following conditions: 95.0%

R80100, thereby, can have excellent near-infrared reflection effect. Furthermore, it satisfies 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.

The film layer made of the second material can be located between the film layer made of the third material and the first material, thereby effectively protecting the film layer made of the first material from oxidation and film cracking.

The reflective coating may further include a film layer made of a fourth material. The fourth material mainly includes a silicon compound, for example, it may be silicon oxide or silicon nitride, and the film layer made of the third material may be located on the third material. The film layers made of the four materials and the first material help to provide a more effective anti-scratch protection effect and anti-oxidation effect of the film layer.

The reflective coating may further include a film layer made of a fifth material. The fifth material mainly includes metal oxide, and the film layer made of the fifth material may be located between the film layer made of the first material and the substrate. , which helps to improve the adhesion effect between the film layer made of the first material and the substrate.

R85，藉此，可以具有優異的反射近紅外線效果。再者，其可滿足下列條件：95.5%

R85；96.0% ≤ R85；96.5% ≤ R85；97.0% ≤ R85；97.5% ≤ R85；98.0% ≤ R85；或98.2% ≤ R85。The reflectivity of the reflective coating at a wavelength of 850nm is R85, which can meet the following conditions: 95.0%

R85, thereby, can have excellent near-infrared reflection effect. 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.

The average reflectance of the reflective coating at wavelengths from 400 nm to 1000 nm is R40100, which can meet the following conditions: 95.0% ≤ R40100, thereby having excellent visible light and near-infrared reflection effects. Furthermore, it can meet the following conditions: 95.5% ≤ R40100; 96.0% ≤ R40100; 96.5% ≤ R40100; 97.0% ≤ R40100; or 98.0% ≤ R40100.

The total number of layers of reflective coating is tLs, which can meet the following conditions: 4 ≤ tLs. Through the complete combination of film layers, the effect of protection and film cracking can be exerted.

The reflective element can be an element with the function of turning the light path, such as a prism or a mirror. By arranging the reflective coating on the appropriate reflective element, it can be cost-effective.

The reflective element can be located on the object side or the image side of the optical lens. By arranging the reflective element in an appropriate position, it helps to miniaturize the end product.

Reflective elements can be located between the optical lenses. By arranging reflective elements at appropriate positions, it can contribute to the miniaturization of end products.

The reflective element can be horizontally movable or rotatably disposed on the image side of the optical lens, whereby the reflective element can achieve focusing and anti-shake effects.

The average reflectance of the reflective coating at wavelengths from 380 nm to 1050 nm is R38105, which can meet the following conditions: 95.0% ≤ R38105; 95.5% ≤ R38105; 96.0% ≤ R38105; 96.5% ≤ R38105; or 97.0% ≤ R38105. Thereby, excellent visible light reflection effect can be achieved.

The average reflectance of the reflective coating at a wavelength of 400 nm to 500 nm is R4050, which can meet the following conditions: 94.0% ≤ R4050; 94.5% ≤ R4050; or 95.0% ≤ R4050. Thereby, excellent visible light reflection effect can be achieved.

The average reflectance of the reflective coating at wavelengths from 400 nm to 600 nm is R4060, which can meet the following conditions: 95.0% ≤ R4060; 95.5% ≤ R4060; or 96.0% ≤ R4060. Thereby, excellent visible light reflection effect can be achieved.

The average reflectance of the reflective coating at wavelengths from 400 nm to 700 nm is R4070, which can meet the following conditions: 95.0% ≤ R4070; 95.5% ≤ R4070; 96.0% ≤ R4070; or 96.5% ≤ R4070. Thereby, excellent visible light reflection effect can be achieved.

The average reflectance of the reflective coating at wavelengths from 650 nm to 1050 nm is R65105, which can meet 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. Thereby, it can have excellent near-infrared reflection effect.

The average reflectance of the reflective coating at wavelengths from 700 nm to 1000 nm is R70100, which can meet 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. Thereby, it can have excellent near-infrared reflection effect.

The average reflectance of the reflective coating at wavelength 900 nm to 1000 nm is R90100, which can meet 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. Thereby, it can have excellent near-infrared reflection effect.

The reflectivity of the reflective coating at a wavelength of 450 nm is R45, which can meet the following conditions: 94.0% ≤ R45; 94.5% ≤ R45; 95.0% ≤ R45; or 95.5% ≤ R45. Thereby, excellent visible light reflection effect can be achieved.

The reflectance of the reflective coating at a wavelength of 550 nm is R55, which can meet the following conditions: 95.0% ≤ R55; 95.5% ≤ R55; 96.0% ≤ R55; 96.5% ≤ R55; or 97.0% ≤ R55. Thereby, excellent visible light reflection effect can be achieved.

The reflectivity of the reflective coating at a wavelength of 650 nm is R65, which can meet the following conditions: 95.0% ≤ R65; 95.5% ≤ R65; 96.0% ≤ R65; 96.5% ≤ R65; 97.0% ≤ R65; or 97.5% ≤ R65. Thereby, excellent visible light reflection effect can be achieved.

The reflectivity of the reflective coating at a wavelength of 750 nm is R75, which can meet 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. Thereby, it can have excellent near-infrared reflection effect.

The reflectivity of the reflective coating at a wavelength of 950 nm is R95, which can meet 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. Thereby, it can have excellent near-infrared reflection effect.

The reflectance of the reflective coating at a wavelength of 1050 nm is R105, which can meet 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. Thereby, it can have excellent near-infrared reflection effect.

The thickness of the film layer made of the fourth material is Tsi, which can meet the following conditions: 10 nm ≤ Tsi ≤ 100 nm; 20 nm ≤ Tsi ≤ 80 nm; or 40 nm ≤ Tsi ≤ 70 nm. This has a protective effect.

The thickness of the film layer 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 avoids oxidation.

The thickness of the film layer made of the second material is Tti, which can meet the following conditions: 1 nm ≤ Tti ≤ 50 nm; 10 nm ≤ Tti ≤ 40 nm; or 20 nm ≤ Tti ≤ 30 nm. In this way, membrane cracking problems can be avoided.

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. In this way, the reflection effect can be enhanced.

50nm；1nm

Tmo

30nm；或Tmo

25nm。藉此，可以強化膜層與基材的黏結效果。 The thickness of the film layer made of the fifth material is Tmo, which can meet the following conditions: 0nm<Tmo

50nm; 1nm

Tmo

30nm; or Tmo

25nm. In this way, the bonding effect between the film layer and the substrate can be strengthened.

1.6。藉此，具保護作用。 The refractive index of the fourth material is N4, which can meet the following conditions: N4

1.6. This has a protective effect.

2.0。藉此，具保護作用與避免氧化。 The refractive index of the third material is N3, which can meet the following conditions: N3

2.0. This provides protection and avoids oxidation.

2.0。藉此，可以避免膜裂。 The refractive index of the second material is N2, which can meet the following conditions: N2

2.0. In this way, membrane cracks can be avoided.

N5

1.7。藉此，可以強化膜層與基材的黏結效果。 The refractive index of the fifth material is N5, which can meet the following conditions: 1.6

N5

1.7. In this way, the bonding effect between the film layer and the substrate can be strengthened.

1.7。藉此，可以有效控制成本。 The refractive index of the reflective element is Ns, which can meet the following conditions: Ns

1.7. In this way, costs can be effectively controlled.

Tag/Tmo

10；2

Tag/Tmo

8；或3

Tag/Tmo

7。藉此，可以強化膜層與基材的黏結效果與維持高反射效果。 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 meet the following conditions: 1

Tag/Tmo

10;2

Tag/Tmo

8; or 3

Tag/Tmo

7. In this way, the bonding effect between the film layer and the substrate can be strengthened and the high reflective effect can be maintained.

Tag/Tti

10；2

Tag/Tti

8；或3

Tag/Tti

7。藉此，可以避免膜裂與強化反射效果。 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 meet the following conditions: 1

Tag/Tti

10;2

Tag/Tti

8; or 3

Tag/Tti

7. In this way, film cracks can be avoided and the reflection effect can be enhanced.

Tcr/Tti

10；1

Tcr/Tti

5；或1

Tcr/Tti

3。藉此，具保護作用與避免膜裂。 The thickness ratio of the film layer made of the third material to the film layer made of the second material is Tcr/Tti, which can meet the following conditions: 1

Tcr/Tti

10;1

Tcr/Tti

5; or 1

Tcr/Tti

3. This provides protection and prevents membrane cracks.

1.00；0.10

(Tcr+Tti)/Tag

0.80；或0.25

(Tcr+Tti)/Tag

0.70。藉此，具保護作用，可以避免氧化、避免膜裂與強化反射效果。 The ratio of the total thickness of the film layer made of the third material and the second material to the thickness of the film layer made of the first material is (Tcr+Tti)/Tag, which can satisfy 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 has a protective effect, preventing oxidation, film cracking and enhancing the reflective effect.

Tsi/Tcr

5；1

Tsi/Tcr

3；或1

Tsi/Tcr

2。藉此，具保護作用與避免氧化。 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 meet the following conditions: 1

Tsi/Tcr

5;1

Tsi/Tcr

3; or 1

Tsi/Tcr

2. This provides protection and avoids oxidation.

The optical lens disclosed in this disclosure can be provided with a long-wavelength filter coating on the surface of the optical lens. The long-wavelength filter coating is a multi-layer film deposited on the surface of the plastic material using a physical vapor deposition method, such as evaporation deposition or sputtering deposition. etc., or use chemical vapor deposition methods, such as ultra-high vacuum chemical vapor deposition, microwave plasma-assisted chemical vapor deposition, or plasma-enhanced chemical vapor deposition.

The optical lens disclosed in this disclosure can add absorbing materials in the optical lens, so that it has better absorption uniformity and makes the color uniformity of each field of view consistent. The optical lens in the optical lens can have a long-wavelength absorbing material. The long-wavelength absorbing material is mixed with the plastic material of the optical lens and evenly distributed therein. The long-wavelength absorbing material must be able to withstand the high temperature of the injection molding process and will not Cracking to maintain the proper long wavelength absorption effect. Optical lenses can also have short-wavelength absorbing materials. The short-wavelength absorbing materials are mixed with the plastic materials of the optical lenses and evenly distributed therein. The short-wavelength absorbing materials must be able to withstand the high temperatures of the injection molding process and not crack, in order to maintain the short wavelengths they should have. absorption effect. The long wavelength range defined in this disclosure is the area with a wavelength above 500 nm, and the short wavelength range is the area with a wavelength below 500 nm.

The reflectance data in this disclosure is generally the data of a single reflective element. If the reflective coating is configured on multiple reflective elements or multiple surfaces, the reflectance data can be the comprehensive data after passing through multiple reflective elements or multiple surfaces.

Plastic optical lenses have excessive surface shape changes due to high temperatures. The more layers of reflective coating there are, the more obvious the effect of temperature on surface shape accuracy will be. Lens correction technology can effectively solve the problem of temperature effects when coating the surface of plastic optical lenses, helping to maintain the coating integrity of optical lenses and the high precision of plastic optical lenses, which is a key technology for achieving high-quality optical lenses.

Optical lens correction technology can apply mold flow analysis method, curve fitting function method or wavefront error method, but is not limited to this. The mold flow analysis method is to find the three-dimensional contour nodes where the surface of the optical lens shrinks in the Z-axis through mold flow analysis, convert it into an aspherical curve, and then compare the difference with the original curve. At the same time, the material shrinkage rate and surface deformation of the optical lens are taken into consideration. trend, and the correction value is calculated. The curve fitting function method is to measure the contour error of the optical lens surface, perform curve fitting with a function, and cooperate with the optimization algorithm to approximate the fitting curve to the measurement point to obtain the correction value. letter The number can be exponential (Exponential) or polynomial (Polynomial), etc., and the algorithm can be Gauss Newton method (Gauss Newton method), simplex algorithm (Simplex Algorithm) or maximum steep descent method (Steepest Descent Method), etc. Among them, the wavefront error method uses an interferometer to measure the wavefront error (imaging error) data of the optical lens, comprehensively analyzes the wavefront error caused by manufacturing and assembly with the original design value wavefront error, and then optimizes the optical software to obtain the correction value. .

In the optical lens provided by the present disclosure, at least one element with the function of turning the optical path, such as a lens or a mirror, can also be selectively disposed on the optical path between the subject and the imaging surface, so as to provide the optical lens with higher flexibility. The spatial configuration makes the electronic device thinner and lighter and is not limited by the total optical length of the optical lens. For further explanation, please refer to Figures 3A and 3B. Figure 3A illustrates a schematic diagram of a configuration relationship of the optical path turning element LF in an optical lens according to the present disclosure. Figure 3B illustrates the optical path turning element according to the present disclosure. Schematic diagram of another configuration relationship of element LF in an optical lens. As shown in Figures 3A and 3B, the optical lens can follow the optical path from the subject (not shown) to the imaging surface IMG, and has a first optical axis OA1, an optical path turning element LF, a second optical axis OA2 and Filter element FL, wherein the light path turning element LF is disposed between the subject and the lens group LG of the optical lens, and the incident surface and exit surface of the light path turning element LF can be flat as shown in Figure 3A, or as shown in Figure 3A Figure 3B shows a curved surface. In addition, please refer to Figure 3C and Figure 3D. Figure 3C shows a schematic diagram of a configuration relationship of the two optical path turning elements LF1 and LF2 in the optical lens according to the present disclosure. Figure 3D shows a configuration relationship according to the present disclosure. Two light road turn Schematic diagram of another configuration relationship of folding elements LF1 and LF2 in an optical lens. As shown in Figure 3C and Figure 3D, the optical lens can also follow the optical path from the subject (not shown) to the imaging surface IMG, and have a first optical axis OA1, an optical path turning element LF1, and a second optical axis OA2 in sequence. , filter element FL, optical path turning element LF2 and third optical axis OA3, wherein the light path turning element LF1 is arranged between the subject and the lens group LG of the optical lens, and the light path turning element LF2 is arranged between the lens group of the optical lens Between LG and the imaging surface IMG, the optical path turning element LF2 can be a mirror as shown in Figure 3C, or a reflector as shown in Figure 3D. In addition, please refer to Figure 3E , which illustrates another schematic diagram of the arrangement relationship of the light path turning element LF in the optical lens according to the present disclosure. As shown in Figure 3E, the optical lens can also follow the optical path from the subject (not shown) to the imaging surface IMG, and has a first optical axis OA1, a filter element FL, an optical path turning element LF, and a second optical axis in sequence. OA2 and the third optical axis OA3, in which the optical path turning element LF is disposed between the lens group LG of the optical lens and the imaging surface IMG, and the optical path can be turned twice in the optical path turning element LF as shown in Figure 3E. The optical lens can also optionally be equipped with more than three light path turning components. The content of this disclosure is not limited to the type, quantity and position of the light path turning components disclosed in the drawings.

The present disclosure provides an imaging device, which includes the aforementioned optical lens and an electronic photosensitive element, and the electronic photosensitive element is disposed on an imaging surface of the optical lens.

The present disclosure provides an electronic device, which is a mobile device, and the electronic device includes the aforementioned imaging device.

The present disclosure provides an electronic device, which includes the aforementioned imaging device. This can improve image quality. Preferably, the aforementioned electronic devices may further include a control unit, a display unit, a storage unit, a temporary storage unit or a combination thereof.

The optical lenses provided in this disclosure can also be used in various aspects such as three-dimensional (3D) image capture, digital cameras, mobile products, digital tablets, smart TVs, network monitoring equipment, motion sensing game consoles, driving recorders, and reverse imaging. devices, wearable products, or electronic devices such as aerial cameras.

The imaging device is a camera module. The imaging device includes an imaging lens, a driving device group and an electronic photosensitive element. The imaging lens includes the optical lens of this disclosure and a lens barrel (not otherwise labeled) carrying the optical lens. The imaging device uses the imaging lens to collect light and capture the object, and cooperates with the driving device group to focus the image. Finally, the image is imaged on the electronic photosensitive element and the image data is output.

The imaging device can be a wide-angle imaging device, an ultra-wide-angle imaging device, a telephoto imaging device (which may include an optical path turning component) or a TOF module (Time-Of-Flight; time-of-flight ranging module), but it is not based on This configuration is limited. In addition, the connection relationship between the imaging device and other components can be adjusted adaptively according to the type of the imaging device, which is not shown or described in detail here.

The driving device group can be an autofocus module, and its driving method can use a driving system such as a voice coil motor, a micro-electromechanical system, a piezoelectric system, or a memory metal. The driving device allows the optical lens to achieve a better imaging position, allowing the subject to capture clear images at different object distances.

The imaging device can be equipped with an electronic sensor with good sensitivity and low noise. Components (such as CMOS, CCD) are placed on the imaging surface of the optical lens, which can truly demonstrate the good imaging quality of the optical lens. In addition, the imaging device may further include an image stabilization module, which may be a kinetic energy sensing element such as an accelerometer, a gyroscope, or a Hall Effect Sensor, but is not limited thereto. By adjusting the changes in different axial directions of the optical lens to compensate for blurry images caused by shaking at the moment of shooting, it further improves the imaging quality of dynamic and low-light scene shooting, and provides features such as Optical Image Stabilization (OIS), electronic Advanced image compensation functions such as anti-shake (Electronic Image Stabilization; EIS).

The electronic device is a smart phone. The electronic device includes an imaging device, a flash module, a focus assist module, an image signal processor (ISP), a user interface and an image software processor. The imaging device can Either the front camera or the rear camera. When the user takes a picture of the subject through the user interface, the electronic device uses the imaging device to focus the light to capture the image, activates the flash module to fill in the light, and uses the subject distance information provided by the focus assist module to quickly focus. , coupled with the image signal processor and image software processor for image optimization processing, to further improve the image quality produced by the image lens. The focus assist module can use infrared or laser focus assist systems to achieve fast focusing. The user interface can use a touch screen or physical shooting button, and cooperate with the diverse functions of image processing software for image shooting and image processing.

The imaging device can capture images corresponding to a non-circular opening on the outside of the electronic device.

Based on the above description, specific embodiments are provided below to explain in detail. bright.

<First Embodiment>

The first embodiment is an optical lens, which includes two optical lenses and a reflective element. From the object side to the image side of the optical path, there are a first optical lens, a second optical lens and a reflective element. Each optical lens has An object-side surface faces the object side and an image-side surface faces the image side. The reflective element is made of a plastic material. The reflective element includes a reflective coating and a substrate. The reflective coating is located on a surface of the substrate. In the first embodiment, the reflective coating includes five film layers. The five film layers are composed of a fourth material, a third material, a second material, and a first material in order from the side close to the air to the side close to the substrate. And made of the fifth material. Among them, the fourth material is silicon dioxide (SiO ₂ ), the third material is chromium oxide (CrO _x ), the second material is titanium (Ti), the first material is silver (Ag), and the fifth material is metal oxide. things.

The reflective coating of the comparative example includes four film layers, which are made of silicon dioxide, chromium oxide, chromium (Cr) and silver in order from the side close to the air to the side close to the substrate. .

The detailed configuration of the reflective coatings of the first embodiment and the comparative example is listed in Table 1 below.

In addition, the refractive index, thickness and other properties of each layer of the reflective coating of the first embodiment are listed in Table 2 below.

Please refer to Figures 1A and 1B together. Figure 1A is a surface quality diagram of the reflective element of the comparative example, and Figure 1B is a surface quality diagram of the reflective element of the first embodiment. It can be seen from Figures 1A and 1B that film cracks occur on the surface of the reflective element of the comparative example, while in the first embodiment, by appropriately arranging film layers of different materials, the surface of the reflective element remains intact without film cracks. .

Please refer to Table 3 and Figure 2 together. Figure 2 is a graph showing the relationship between the reflectivity and wavelength of the reflective element of the first embodiment. The measurement results of the reflectivity of the reflective element of the first embodiment at different wavelengths are Listed in Table 3 below.

It can be seen from the results in Table 3 above that for visible light and near-infrared rays, the reflective element of the first embodiment can effectively reflect light of different wavelengths, and its reflection effect is quite excellent, which helps to avoid the formation of reflective coatings on the reflective elements. Membrane crack problem.

The optical lens according to the embodiment of the present disclosure may also include three optical lenses and a reflective element, four optical lenses and a reflective element, five optical lenses and a reflective element, six optical lenses and a 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 can also include three optical lenses and two reflective elements, four optical lenses and two Reflective element, 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 can 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.

Although the present disclosure has been disclosed in the form of embodiments, it is not intended to limit the disclosure. Anyone skilled in the art can make various modifications and modifications without departing from the spirit and scope of the disclosure. Therefore, this disclosure The scope of protection of the disclosed content shall be determined by the scope of the patent application attached.

R38105: Average reflectance of reflective coating at wavelength 380nm to 1050nm

R4050: Average reflectance of reflective coating at wavelength 400nm to 500nm

R4060: Average reflectance of reflective coating at wavelength 400nm to 600nm

R4070: Average reflectance of reflective coating at wavelength 400nm to 700nm

R40100: Average reflectance of reflective coating at wavelength 400nm to 1000nm

R65105: Average reflectance of reflective coating at wavelength 650nm to 1050nm

R70100: Average reflectance of reflective coating at wavelength 700nm to 1000nm

R80100: average reflection of reflective coating at wavelength 800nm to 1000nm emissivity

R90100: Average reflectance of reflective coating at wavelength 900nm to 1000nm

R45: Reflectivity of reflective coating at wavelength 450nm

R55: Reflectivity of reflective coating at wavelength 550nm

R65: Reflectivity of reflective coating at wavelength 650nm

R75: Reflectivity of reflective coating at wavelength 750nm

R85: Reflectivity of reflective coating at wavelength 850nm

R95: Reflectivity of reflective coating at wavelength 950nm

R105: Reflectivity of reflective coating at wavelength 1050nm

tLs: total number of layers of reflective coating

Tsi: Thickness of the film layer made of the fourth material

Tcr: Thickness of film layer made of third material

Tti: Thickness of the film layer made of the second material

Tag:Thickness of the film layer made of the first material

Tmo: Thickness of the film layer made of the fifth material

N4: refractive index of the fourth material

N3: refractive index of the third material

N2: refractive index of the second material

N5: refractive index of the fifth material

Ns: refractive index of reflective element

LF, LF1, LF2: optical path turning components

IMG: imaging surface

OA1: first optical axis

OA2: Second optical axis

OA3: The third optical axis

FL: filter element

LG: lens group

In order to make the above and other objects, features, advantages and embodiments of the present disclosure more obvious and understandable, the accompanying drawings are described as follows: Figure 1A is a surface quality diagram of the reflective element of the comparative example; Figure 1B is a surface quality diagram of the reflective element of the first embodiment; Figure 2 is a graph of the relationship between reflectance and wavelength of the reflective element of the first embodiment; Figure 3A shows a schematic diagram of the arrangement relationship of the light path turning element in the optical lens according to the present disclosure; Figure 3B shows another schematic diagram of the arrangement relationship of the light path turning element in the optical lens according to the present disclosure; Figure 3C A schematic diagram illustrating a configuration relationship of two optical path turning elements in an optical lens according to the present disclosure; Figure 3D shows another schematic diagram of a configuration relationship of two optical path turning elements in an optical lens according to the present disclosure; and Figure 3E This is a schematic diagram illustrating another arrangement relationship of the light path turning element in the optical lens according to the present disclosure.

Claims (13)

An optical lens, including: at least two optical lenses; and at least one reflective element; wherein the reflective element is made of a plastic material, the reflective element includes a reflective coating and a base material, the reflective coating is located on the base material A surface; wherein, the reflective coating includes at least three film layers of different materials. The three film layers are respectively made of a first material, a second material and a third material. The first material mainly includes silver, and the The second material mainly includes titanium, the third material mainly includes chromium oxide, and the film layers made of the first material and the second material are located between the film layer made of the third material and the substrate. time; among them, the average reflectivity of the reflective coating at wavelengths from 800nm to 1000nm is R80100, which meets the following conditions: 97.5%

R80100. The optical lens of claim 1, wherein the film layer made of the second material is located between the film layers made of the third material and the first material. The optical lens of claim 2, wherein the reflective coating further includes a film layer made of a fourth material, the fourth material mainly includes a silicon compound, and the film layer made of the third material is located between the film layers made of the fourth material and the first material. The optical lens of claim 3, wherein the reflective coating further includes a film layer made of a fifth material, the fifth material mainly includes metal oxide, and the film layer made of the fifth material Located between the film layer made of the first material and the substrate. The optical lens as described in claim 3, wherein the average reflectance of the reflective coating at wavelengths from 400nm to 1000nm is R40100, which meets the following conditions: 98.0%

R40100. The optical lens as described in claim 4, wherein the reflective coating has a reflectance of R85 at a wavelength of 850nm, which meets the following conditions: 98.0%

R85. The optical lens as described in claim 5, wherein the total number of layers of the reflective coating is tLs, which meets the following conditions: 4

tLs. The optical lens according to claim 1, wherein the reflective element is located on the object side or image side of the optical lens. The optical lens according to claim 1, wherein the reflective element is located between the at least two optical lenses. The optical lens according to claim 7, wherein the reflective element is a lens or a reflecting mirror. The optical lens according to claim 1, wherein the reflective element is disposed on the image side of the optical lens in a horizontally movable or rotatable manner. An imaging device includes: the optical lens as described in claim 1; and an electronic photosensitive element, which is disposed on an imaging surface of the optical lens. An electronic device is a mobile device, and the electronic device includes: the imaging device described in claim 12.

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