Optical lens, lens module and electronic equipment

Abstract

The invention provides an optical lens, a lens module and an electronic device, the optical lens comprises a super lens and a lens barrel, the super lens is accommodated in the lens barrel, the super lens comprises a substrate and a plurality of nano-column structures, and the plurality of nano-column structures are fixed on the image side of the substrate; the phase of each nanorod structure meets the phase determined according to a first wavelength, so that the super lens focuses infrared light, and the first wavelength is the wavelength corresponding to the infrared light; the phase of each nano-column structure also meets the phase determined according to a second wavelength, so that the super lens performs light splitting on the visible light, and the second wavelength is the wavelength corresponding to the visible light. The optical lens provided by the invention can carry out light splitting processing on focused infrared light and visible light, does not need two sets of camera modules, can realize depth measurement and multispectral imaging functions under the condition that only one optical lens is used, and saves the space and manufacturing cost of electronic equipment.

Description

Technical Field

[0001] The present application relates to the field of lenses, and in particular, to an optical lens, a lens module and an electronic device. Background Art

[0002] With the continuous development of electronic equipment technology, the camera function has become an important feature of electronic equipment and a major indicator for evaluating the performance of electronic equipment. In order to meet the diverse needs of users, electronic equipment can have the function of depth measurement and the function of multi-spectral imaging. At present, two independent lens modules are required to realize the depth measurement function and the multi-spectral imaging function. For this method, the use of two separate lens modules will increase additional costs and occupy double the space, further squeezing the space of the whole machine and the effective display area of ​​the screen. Based on this, how to realize the depth measurement function and the multi-spectral imaging function at the same time has become an urgent problem to be solved. Summary of the invention

[0003] The present application provides an optical lens, a lens module, and an electronic device. The optical lens provided in the present application can perform phase modulation on visible light and infrared light to focus infrared light, and perform spectroscopic processing on visible light, without the need for two sets of camera modules. With only one optical lens, depth measurement and multi-spectral imaging functions can be achieved, saving space and manufacturing costs of electronic devices.

[0004] In a first aspect, an optical lens is provided, which includes a superlens and a lens barrel, wherein the superlens is accommodated in the lens barrel, and the superlens includes a substrate and a plurality of nanocolumn structures, wherein the plurality of nanocolumn structures are fixed to the image side of the substrate; the phase of each nanocolumn structure satisfies a phase determined according to a first wavelength so that the superlens focuses infrared light, and the first wavelength is a wavelength corresponding to the infrared light; the phase of each nanocolumn structure also satisfies a phase determined according to a second wavelength so that the superlens splits visible light, and the second wavelength is a wavelength corresponding to the visible light.

[0005] In the embodiment of the present application, by rationally arranging the nanocolumn structure of the superlens, when the incident light beam passes through the superlens, the infrared light corresponding to the first wavelength and the visible light corresponding to the second wavelength can be phase modulated, so that the superlens focuses the infrared light and performs spectral processing on the visible light. Without two sets of camera modules, depth measurement and multi-spectral imaging functions can be achieved with only one optical lens, saving space and manufacturing costs of electronic equipment.

[0006] In combination with the first aspect, in some implementations of the first aspect, the phase of each nanorod structure satisfies any one of the following formulas (1) or (2), and also satisfies any one of the formulas (3) or (4),

[0007]

[0008]

[0009]

[0010]

[0011] in, is the phase of each nanorod structure for the first wavelength, r is the distance from each nanorod structure to the center of the substrate, f is the focal length, λ1 is the first wavelength, a i is the first adjustment parameter, is the phase of each nanorod structure for the second wavelength, α is the deflection angle corresponding to the second wavelength, λ2 is the second wavelength, and b i is the second adjustment parameter, and R is the aperture of the substrate.

[0012] In combination with the first aspect, in certain implementations of the first aspect, the heights of the plurality of nano-column structures are between 600 nm and 1500 nm, and the distance between two adjacent nano-column structures in the plurality of nano-column structures is between 200 nm and 400 nm.

[0013] In combination with the first aspect, in some implementations of the first aspect, the first wavelength is 940 nm, and the second wavelength is 550 nm.

[0014] In combination with the first aspect, in some implementations of the first aspect, the plurality of nanorod structures are rotationally symmetric structures and the rotation angle is 90°.

[0015] In a second aspect, an optical lens is provided, which includes a superlens and a lens barrel, wherein the superlens is accommodated in the lens barrel, and the superlens includes a substrate and a plurality of nanocolumn structures, wherein the plurality of nanocolumn structures are fixed to the image side of the substrate; the superlens includes a first part and a second part, wherein the phase of each nanocolumn structure of the first part satisfies the phase determined according to a first wavelength so that the superlens focuses infrared light, and the first wavelength is the wavelength of the infrared light; the phase of each nanocolumn structure of the second part satisfies the phase determined according to a second wavelength so that the superlens splits visible light, and the second wavelength is the wavelength of visible light.

[0016] In the embodiment of the present application, the superlens is divided into two parts. By reasonably arranging the nanocolumn structures of the two parts, the first part and the second part are respectively used to phase modulate the infrared light corresponding to the first wavelength and the visible light corresponding to the second wavelength, so that after the incident light beam passes through the optical lens, the optical lens can focus the infrared light in the incident light beam and perform spectral processing on the visible light. There is no need for two sets of camera modules. Depth measurement and multi-spectral imaging functions can be achieved with only one optical lens, saving space and manufacturing costs of electronic equipment.

[0017] In conjunction with the second aspect, in some implementations of the second aspect, the phase of each nanorod structure of the first portion satisfies any one of the following formulas (1) or (2), and the phase of each nanorod structure of the second portion satisfies any one of the following formulas (3) or (4),

[0018]

[0019]

[0020]

[0021]

[0022] in, is the phase of each nanorod structure of the first part for the first wavelength, r is the distance from each nanorod structure of the first part to the center of the substrate, f is the focal length, λ1 is the first wavelength, a i is the first adjustment parameter, is the phase of each nanorod structure of the second part for the second wavelength, α is the deflection angle corresponding to the second wavelength, λ2 is the second wavelength, and b i is the second adjustment parameter, and R is the aperture of the substrate.

[0023] In combination with the second aspect, in certain implementations of the second aspect, the heights of the plurality of nano-column structures are between 600 nm and 1500 nm, and the distance between two adjacent nano-column structures in the plurality of nano-column structures is between 200 nm and 400 nm.

[0024] In combination with the second aspect, in some implementations of the second aspect, the first wavelength is 940 nm, and the second wavelength is 550 nm.

[0025] In combination with the second aspect, in some implementations of the second aspect, the plurality of nanorod structures are rotationally symmetric structures and the rotation angle is 90°.

[0026] In a third aspect, a lens module is provided, which includes the optical lens and image sensor in the first aspect and any implementation of the first aspect, the optical lens is used to focus infrared light on a first area of ​​the image sensor, and divide visible light into multiple sub-beams and project them to a second area of ​​the image sensor, and the first area and the second area are different.

[0027] In combination with the third aspect, in certain implementations of the third aspect, the lens module further includes a filter, which is disposed between the optical lens and the first area of ​​the image sensor, and is used to filter the visible light.

[0028] In a fourth aspect, a lens module is provided, which includes the optical lens and image sensor in the second aspect and any implementation of the second aspect, the optical lens is used to focus infrared light on a first area of ​​the image sensor, and divide visible light into multiple sub-beams and project them to a second area of ​​the image sensor, and the first area and the second area are different.

[0029] In combination with the fourth aspect, in certain implementations of the fourth aspect, the lens module further includes a filter, which is disposed between the optical lens and the first area of ​​the image sensor, and is used to filter the visible light.

[0030] In a fifth aspect, an electronic device is provided, which includes the lens module in the implementation of the third aspect and the fourth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of an electronic device provided in an embodiment of the present application.

[0032] Figure 2 It is a schematic diagram of the imaging principle provided in an embodiment of the present application.

[0033] Figure 3 It is a schematic cross-sectional view of an optical lens provided in an embodiment of the present application.

[0034] Figure 4 This is a phase diagram of nanorod structures with different diameters at the same height provided in an embodiment of the present application.

[0035] Figure 5 It is a schematic diagram of the distribution of the diameters of multiple nano-column structures provided in an embodiment of the present application as a function of position.

[0036] Figure 6 It is a schematic diagram of the simulation effect of the superlens provided in the embodiment of the present application.

[0037] Figure 7 It is a schematic cross-sectional view and a schematic top view of another optical lens provided in an embodiment of the present application.

[0038] Figure 8 It is a schematic diagram of the simulation effect of the superlens provided in the embodiment of the present application.

[0039] Fig. 9 It is an exploded view of the lens module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] The technical solution in the present application will be described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0041] In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0042] In addition, in the present application, directional terms such as "center", "up", "down", "left", "right", "top" and "bottom" are defined relative to the orientation or position of the components schematically placed in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, rather than indicating or implying that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. It can change accordingly according to the change of the orientation of the components placed in the drawings, and therefore cannot be understood as a limitation of the present application.

[0043] It should also be noted that, in the embodiments of the present application, the same figure mark is used to represent the same component or the same part. For the same parts in the embodiments of the present application, the figure may only mark one of the parts or components as an example. It should be understood that the figure mark also applies to other identical parts or components.

[0044] The electronic devices involved in the embodiments of the present application may include handheld devices, vehicle-mounted devices, wearable devices, computing devices, or other processing devices connected to a wireless modem. They may also include cellular phones, smart phones, personal digital assistants (PDA) computers, tablet computers, laptop computers, machine type communication (MTC) terminals, point of sales (POS), vehicle-mounted computers, and other terminals with imaging functions.

[0045] With the continuous development of electronic equipment technology, the camera function has become an important feature of electronic equipment and a major indicator for evaluating the performance of electronic equipment. In order to meet the diverse needs of users, electronic equipment can have the function of depth measurement and the function of multi-spectral imaging. At present, two independent lens modules are required to realize the depth measurement function and the multi-spectral imaging function. For this method, the use of two separate lens modules will increase additional costs and occupy double the space, further squeezing the space of the whole machine and the effective display area of ​​the screen. Based on this, how to realize the depth measurement function and the multi-spectral imaging function at the same time has become an urgent problem to be solved.

[0046] For ease of understanding, the technical terms involved in this application are explained and described below.

[0047] Focus: When light parallel to the optical axis enters a convex lens, the ideal convex lens should be one in which all the light converges at a point behind the lens. This point where all the light converges is the focus.

[0048] Focal length, also known as focal length, is a measure of the focusing or divergence of light in an optical system. It refers to the distance from the optical center of a lens or lens group to the focal point when an infinitely distant scene forms a clear image on the focal plane through a lens or lens group. It can also be understood as the vertical distance from the optical center of a lens or lens group to the focal plane. From a practical point of view, it can be understood as the distance from the center of the lens to the imaging plane. For a fixed-focus lens, the position of its optical center is fixed, so the focal length is fixed; for a zoom lens, the change of the optical center of the lens brings about a change in the focal length of the lens, so the focal length can be adjusted.

[0049] In optical instruments, the angle of view (FOV) is the angle formed by the two edges of the maximum range of the image of the object to be measured that can pass through the lens, with the lens of the optical instrument as the vertex. The size of the field of view angle determines the field of view of the optical instrument. The larger the field of view angle, the larger the field of view and the smaller the optical magnification. The shorter the focal length, the wider the horizontal field of view, and the smaller the image. The horizontal field of view becomes narrower as the focal length increases, and the object becomes larger accordingly.

[0050] The object space is bounded by the lens and the space where the photographed object is located is the object space.

[0051] The image space is bounded by the lens. The space where the image formed behind the lens by the light emitted by the subject passing through the lens is located is the image space.

[0052] With the lens as the boundary, the side where the subject is located is the object side, and the surface of the lens close to the object side can be called the object side surface; with the lens as the boundary, the side where the image of the subject is located is the image side, and the surface of the lens close to the image side can be called the image side surface.

[0053] Figure 1 A schematic diagram of an electronic device is shown. The electronic device 100 may be a device with a video or photo function, such as a cellular phone, a mobile phone, a smart phone, a tablet computer, a laptop computer, a video camera, a video recorder, a camera, a smart watch, a smart wristband, or other devices with a photo or video function. The embodiment of the present application does not impose any special restrictions on the specific form of the electronic device 100. For the convenience of explanation and understanding, the following description is made by taking the electronic device 100 as a mobile phone as an example.

[0054] The electronic device 100, such as Figure 1 As shown, it may include a display panel (DP) 101, a housing 102, a camera compact module (CCM) 103, etc. The housing 102 is formed with a receiving space, and the display panel 101 and the lens module 103 are arranged in the receiving space of the housing 102. The display panel 101 may be a liquid crystal display (LCD) screen, an organic light emitting diode (OLED) display screen, etc., wherein the OLED display screen may be a flexible display screen or a hard display screen.

[0055] The lens module 103 can be arranged only on the front side of the electronic device 100 to shoot the scene on the front side of the electronic device 100, which can be referred to as a front lens module in some embodiments; it can also be arranged only on the back side of the electronic device 100 to shoot the scene on the back side of the electronic device 100, which can be referred to as a rear lens module in some embodiments; it can also be arranged on both the front and back sides of the electronic device 100, such as Figure 1 As shown, a lens module 103 is disposed on the front of the electronic device 100, and a lens module 103 is also disposed on the back of the electronic device 100. The scene on the front side of the electronic device 100 can be photographed, and the scene on the back side of the electronic device 100 can also be photographed, as long as the corresponding lens module is used during shooting.

[0056] It should be understood that the installation position of the lens module 103 is merely schematic. In some embodiments, when the lens module 103 is used as a front lens module, it can also be installed at other positions on the electronic device 100, such as on the left side of the receiver, the upper middle position of the electronic device 100, the lower part of the electronic device 100, or the four corners of the electronic device 100; when the lens module 103 is used as a rear lens module, it can be installed at the upper middle position or the upper right corner of the back of the electronic device 100. In some other embodiments, the lens module 103 may not be set on the main body of the electronic device 100, but on an edge protruding relative to the main body of the electronic device 100, or on a component that is movable or rotatable relative to the electronic device 100, such as the component that can extend, retract, or rotate from the main body of the electronic device 100. When the lens module 103 is rotatable relative to the electronic device 100, the lens module 103 is equivalent to the front lens module and the rear lens module, that is, by rotating the same lens module 103, the scene on the front side of the electronic device 100 can be photographed, and the scene on the back side of the electronic device 100 can also be photographed. In other embodiments, when the display screen 101 is foldable, the lens module 103 can be used as both a front lens module and a rear lens module. The lens module 103 is used to photograph the scene on the front side of the electronic device 100 or the scene on the back side of the electronic device 100 as the display screen 101 is folded.

[0057] The embodiment of the present application does not limit the number of lens modules 103, which can be one, two, four or even more. For example, the electronic device 100 can be provided with one or more lens modules 103 on the front, and one or more lens modules 103 on the back. The embodiment of the present application does not impose any restrictions on the number of lens modules, nor does it impose any restrictions on the relative positions of multiple lens modules when they are provided. When multiple lens modules 103 are provided, the multiple lens modules 103 can be completely the same or different, for example, the optical parameters of the multiple lens modules 103 are different.

[0058] Optionally, the electronic device 100 may further include a lens protection lens 104 for protecting the lens module 103. The lens protection lens 104 is disposed on the housing 102 to cover the lens module 103. When the lens protection lens 104 is used to protect the front lens module, the lens protection lens 104 may only cover the front lens module or cover the entire front of the electronic device 100, wherein when the lens protection lens 104 covers the entire front of the electronic device 100, it may be used to protect the front lens module and the display screen 101 at the same time, and the lens protection lens 104 is a cover glass (cover glass, CG). When the lens protection lens 104 is used to protect the rear lens module, the lens protection lens 104 may cover the entire back of the electronic device 100, or may be only disposed at a position corresponding to the rear lens module to protect the rear lens module. The material of the lens protection lens 104 may be glass, sapphire, ceramic, etc., which is not specifically limited in the embodiments of the present application. In some embodiments, the lens protection lens 104 is transparent, so that light outside the electronic device 100 can enter the lens module 103 through the lens protection lens 104 .

[0059] It should be noted that the front side of the electronic device 100 described in the embodiment of the present application can be understood as the side surface of the electronic device 100 facing the user when the user uses the electronic device 100, and the back side of the electronic device 100 can be understood as the side surface of the electronic device 100 facing away from the user when the user uses the electronic device 100.

[0060] It should be understood that Figure 1 The electronic device 100 shown in is not limited to the above devices, but may also include other devices, such as a battery, a flash, a fingerprint recognition module, an earpiece, buttons, sensors, etc. The embodiment of the present application only takes the terminal equipped with a lens module 103 as an example for explanation, but the components installed on the electronic device 100 are not limited to this.

[0061] Figure 2 The schematic diagram of the imaging principle is shown. The light L reflected by the photographed scene passes through the optical lens (lens) 201 to generate an optical image and is projected onto the surface of the image sensor (sensor) 202. The optical image is then converted into an electrical signal, namely an analog image signal S1. The analog image signal S1 is converted into a digital image signal S2 through an analog-to-digital converter A / D (also called an A / D converter) 203. The digital image signal S2 is processed by an image processor 204, such as a digital signal processing chip (digital signal processing, DSP), to form a compressed image signal S3, which can be stored in a memory 205 for processing, and finally displayed on a display or screen.

[0062] The optical lens 201 affects the imaging quality and imaging effect. The light of the scene passes through the optical lens 201, and a clear image can be formed on the focusing plane, and the image of the scene can be recorded through the photosensitive material or the photoreceptor. The optical lens 201 can be a whole composed of one or more lenses combined by a system. The lens can be a plastic lens or a glass lens, a spherical lens or an aspherical lens, a refractive lens or a reflective lens. The optical lens 201 in the embodiment of the present application includes a super lens, which can phase modulate the incident light. Please refer to the following for a specific description.

[0063] Image sensor 202 is a semiconductor chip with a photodiode on its surface. When exposed to light, it generates an electric charge, which is converted into a digital signal through an analog-to-digital converter chip. Image sensor 202 can be a charge coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS). The charge coupled device image sensor CCD is made of a high-sensitivity semiconductor material, which can convert light into electric charge, which is converted into a digital signal through an analog-to-digital converter chip. CCD is composed of many photosensitive units, usually in units of millions of pixels. When the CCD surface is exposed to light, each photosensitive unit will reflect the charge on the component, and the signals generated by all the photosensitive units are added together to form a complete picture. Complementary metal oxide semiconductor CMOS is mainly a semiconductor made of two elements, silicon and germanium, so that semiconductors with N (with negative charge) and P (with positive charge) levels coexist on CMOS. The current generated by these two complementary effects can be recorded and interpreted into an image by the processing chip. In some embodiments, image sensor 202 can also be called a photosensitive chip, a photosensitive element, etc.

[0064] The function of the image processor 204 is to optimize the digital image signal through a series of complex mathematical algorithms, and finally transmit the processed signal to the display. The image processor 204 can be an image processing chip or a digital signal processing chip (DSP). Its function is to transmit the data obtained by the photosensitive chip to the central processor in a timely and fast manner and refresh the photosensitive chip. Therefore, the quality of the DSP chip directly affects the image quality (such as color saturation, clarity, etc.).

[0065] It should be understood that the “lens” described in the embodiments of the present application should be understood as an integral lens, including one or more lenses.

[0066] Figure 3 A schematic cross-sectional view of an optical lens provided in an embodiment of the present application is shown. Figure 3As shown, the optical lens 201 is Figure 1 The optical lens of the lens module 103 shown in FIG. Figure 3 The structure of the optical lens 201 is described.

[0067] like Figure 3 As shown, the optical lens 201 includes a metalens 1 and a lens barrel 2.

[0068] The superlens 1 is used to phase modulate light of different wavelengths so that light of different wavelengths can be projected to different areas of the image sensor, or light of different wavelengths can be projected to different image sensors, that is, to focus infrared light and perform spectroscopic processing on visible light.

[0069] The lens barrel 2 is formed with a receiving space, and the super lens 1 is received in the receiving space. The lens barrel 2 can be a whole, and the super lens 1 is received in the whole lens barrel 2. The lens barrel 2 can also include multiple lens barrel parts.

[0070] In the embodiment of the present application, light of different wavelength bands can be phase modulated by the optical lens 201. For example, the optical lens 201 can be used to split visible light (400-760nm) into multiple light beams and project them to the first area of ​​the first image sensor, and infrared light (760nm-1000nm) can be focused to the second area of ​​the first image sensor.

[0071] For another example, the optical lens 201 is used to split the visible light into a plurality of light beams and project them onto the first area of ​​the first image sensor, and the infrared light is focused onto the first area of ​​the second sensor.

[0072] Optionally, in some embodiments, since the wavelength range of visible light is relatively wide, in order to realize multi-spectral imaging function, when the visible light is projected onto the first area of ​​the image sensor, the visible light can also be split and processed to further project the visible light into different areas of the first area according to different wavelength bands.

[0073] For example, the optical lens 201 can project purple light (400-435 nm) to the first sub-region of the first region, and project blue light (435-450 nm) to the second sub-region of the first region.

[0074] It should be noted that Figure 3 It is schematically shown that the optical lens 201 includes one super lens, but it should be understood that the optical lens 201 can also include more lenses, which may be super lenses or not, and the embodiments of the present application do not limit this.

[0075] As mentioned above, in order to realize the depth measurement function and the multi-spectral imaging function, two separate lenses need to be set, which will increase the cost and the internal space of the electronic device. Based on this, an embodiment of the present application provides an optical lens, which includes a super lens. Through the phase modulation of light by the super lens, near-infrared imaging and visible light splitting functions can be realized. The super lens in the optical lens provided in the embodiment of the present application will be described in detail below in conjunction with the accompanying drawings.

[0076] Figure 3 Also shown is a schematic structure of a superlens provided in an embodiment of the present application. For the convenience of description, the upper side of the superlens is defined as the object side, the surface of the superlens facing the object side can be called the object side surface, the lower side of the superlens is defined as the image side, and the surface of the superlens facing the image side can be called the image side surface.

[0077] like Figure 3 As shown, the super lens 1 includes a substrate 11 and a plurality of nanorod structures 12 disposed on the image side. The substrate may also be referred to as a base plate.

[0078] The substrate 11 can be made of a light-transmitting material. For example, the substrate 11 can be made of silicon dioxide, or the substrate 11 can be made of polydimethylsiloxane, which is not limited in the present embodiment. The thickness of the substrate 11 can be designed according to the design requirements of the electronic device. For example, the thickness of the substrate 11 is 1000nm, 1500nm, etc.

[0079] The nanorod structure 12 may be a 90° rotationally symmetrical structure, for example, the nanorod structure 12 may be a square column, a round column, a regular hexagonal column, etc. The present embodiment of the application does not limit the material of the nanorod structure 12, for example, the nanorod structure 12 may be made of gallium nitride (GaN).

[0080] A plurality of nanocolumn structures 12 are arranged on the image side of the substrate 11. Through the reasonable arrangement of the plurality of nanocolumn structures 12, the phases of the superlens 11 for light of different wavelengths at different positions can be different, so as to achieve focusing of infrared light and splitting of visible light.

[0081] Optionally, in some embodiments, the phases of the multiple nanorod structures 12 of the superlens 1 satisfy the first distribution, so that the multiple nanorod structures can focus infrared light and perform spectroscopic processing on visible light.

[0082] Optionally, in some embodiments, in order to satisfy the first distribution, the phase distribution of the multiple nanopillar structures 12 of the superlens 1 can satisfy formula (1), that is, when the phase of the nanopillar structure 12 for the first wavelength satisfies the phase determined according to formula (1), the nanopillar structure 12 can focus infrared light.

[0083]

[0084] in, is the phase of each nanorod structure 12 for the first wavelength, r is the distance from the nanorod structure 12 to the center of the substrate 11, f is the focal length, λ1 is the first wavelength, and the first wavelength is the wavelength corresponding to the infrared light. In the embodiment of the present application, the value of the first wavelength may not be limited, that is, the first wavelength may be any wavelength within the wavelength range of the infrared light.

[0085] For example, nanocolumn structure 12#1 is a nanocolumn structure 12 located at position #1 of substrate 11. The phase of nanocolumn structure 12#1 can be determined to be 4 rad according to the above formula (1). After determining that the phase of nanocolumn structure 12#1 for the first wavelength needs to be 4 rad, the height and / or diameter of nanocolumn structure 12#1 can be adjusted so that the phase of nanocolumn structure 12#1 for the first wavelength is 4 rad.

[0086] Optionally, in some embodiments, λ1=940 nm.

[0087] Optionally, in some embodiments, in order for the phases of the multiple nanorod structures 12 of the superlens 1 to satisfy the first distribution, the phase distribution of the multiple nanorod structures 12 may also satisfy formula (2).

[0088]

[0089] in, is the phase of each nanorod structure 12 for the first wavelength, a i is the first adjustment parameter, and r is the distance from the nanorod structure 12 to the center of the substrate 11 .

[0090] It should be noted that for different wavelengths, a in formula (2) i The value of is different, that is, a i It can be understood as a variable related to the wavelength. In some embodiments of the present application, a can be determined according to the first wavelength. i In determining the value of a i After calculating r and r, the phase of the nanorod structure 12 at the position corresponding to r can be determined. i It can be understood as an optimized adjustment parameter. When determining the phase of the multiple nanorod structures 12 of the superlens 1, a can be adjusted according to the actual effect and / or simulation results. i , so that the phases of the obtained multiple nanorod structures 12 meet the usage requirements.

[0091] For example, taking i=8, wavelength=940nm, focal length=1mm, and field of view angle=60°, a0~a8 can be [-478.0, -1000, -699.59, 324.3, 478.5, 304.7, 13.0, -313.8].

[0092] It is understood that the above is only an example and should not be construed as a specific limitation of the present application. When the design parameters change, the a i To meet design requirements.

[0093] It can be understood that, since the calculation formula (1) or (2) is based on the wavelength of infrared light, when the phase distribution of each nanorod structure 12 of the superlens 11 satisfies the formula (1) or (2), the superlens 1 can focus infrared light. In other words, when the multiple nanorod structures 12 of the superlens 1 satisfy the phase determined according to the first wavelength, infrared light can be focused.

[0094] It should be noted that the phase distribution of the nanocolumn structure 12 described in the embodiment of the present application satisfies formula (1) or (2) within the error range, and does not mean that it is completely the same as the phase calculated according to formula (1) or (2). For example, assuming that the allowable error is 0.5 rad, according to formula (1) or formula (2), the phase of position #1 of the metalens 1 is 5 rad for the first wavelength, while the phase of the nanocolumn structure 12 at position #1 of the metalens 1 actually measured for the first wavelength is 4.8 rad. The difference between the two is within the error range. It can be considered that for the first wavelength, the phase of the nanocolumn structure 12 at position #1 of the metalens 1 satisfies formula (1) or formula (2), that is, it can focus infrared light.

[0095] Optionally, in some embodiments, when the phases of the multiple nanopillar structures 12 of the superlens 1 satisfy the first distribution, the phase of each nanopillar structure 12 of the multiple nanopillar structures 12 also needs to satisfy the phase determined according to the second wavelength to perform spectroscopic processing on visible light, and the second wavelength is the wavelength of visible light.

[0096] Optionally, in some embodiments, in order to make the phases of the multiple nanopillar structures 12 of the metalens 1 satisfy the first distribution, the phase distribution of the multiple nanopillar structures 12 may also satisfy formula (3) when satisfying the above formula (1) or (2), that is, the phases of the multiple nanopillar structures 12 satisfying the first distribution can be understood as the phase distribution of the multiple nanopillar structures 12 satisfying formula (1) or (2), and also satisfying formula (3).

[0097]

[0098] in, is the phase of each nanorod structure 12 for the second wavelength, r is the distance from the nanorod structure 12 to the center of the substrate 11, α is the deflection angle corresponding to the second wavelength (for example, 23°), and λ2 is the second wavelength, which is the wavelength corresponding to the visible light. In the embodiment of the present application, the value of the second wavelength may not be limited, that is, the second wavelength may be any wavelength within the wavelength range of the visible light.

[0099] For example, nanocolumn structure 12#1 is a nanocolumn structure 12 located at position #1 of substrate 11. The phase of nanocolumn structure 12#1 can be determined to be 4 rad according to the above formula (3). After determining that the phase of nanocolumn structure 12#1 for the second wavelength needs to be 4 rad, the height and / or diameter of nanocolumn structure 12#1 can be adjusted so that the phase of nanocolumn structure 12#1 for the second wavelength is 4 rad.

[0100] Optionally, in some embodiments, the second wavelength is 550 nm, a central wavelength of the visible light wavelength range.

[0101] Similarly, the phase distribution of the nanocolumn structure 12 described in the embodiment of the present application satisfies formula (3) means that it satisfies formula (3) within the error range, rather than meaning that it is completely the same as the phase calculated according to formula (3). For example, assuming that the allowable error is 0.5 rad, according to formula (3), for the second wavelength, the phase of the nanocolumn structure 12 at position #1 of the superlens 1 is 4 rad, while the phase of the nanocolumn structure 12 at position #1 of the superlens 1 actually measured is 4.4 rad. The difference between the two is within the error range, so it can be considered that for the second wavelength, the phase of the nanocolumn structure 12 at position #1 of the superlens 1 satisfies formula (3).

[0102] When the distribution of the multiple nanocolumn structures 12 of the superlens 1 satisfies formulas (1) and (3), or satisfies formulas (2) and (3), the superlens 1 can focus infrared light and split visible light, and then combined with an image sensor, it can realize depth measurement and multi-spectral imaging functions.

[0103] Optionally, in some embodiments, the superlens 1 can perform spectroscopic processing on visible light. In order to reduce the crosstalk between the spectroscopic signals, the phase distribution of the plurality of nanorod structures 12 needs to satisfy the formula (4) when satisfying the above formula (1) or (2).

[0104]

[0105] in, is the phase of each nanorod structure 12 for the second wavelength, r is the distance from the nanorod to the center of the substrate 11, α is the deflection angle corresponding to the second wavelength (for example, 23°), λ2 is the second wavelength, and b i is the second adjustment parameter, the second wavelength is the wavelength corresponding to the visible light, and R is the aperture of the substrate 11. It can be understood that in formula (4), i It is an adjustment parameter related to the second wavelength. For a specific description, please refer to the description of the first adjustment parameter. For the sake of brevity, it will not be repeated here.

[0106] The embodiment of the present application can reasonably arrange the multiple nano-pillar structures 12 so that the super lens 11 satisfies formula (1) or formula (2), and also satisfies formula (3) or (4). The following is an example of the phase distribution of the multiple nano-pillar structures 12 of the super lens 1 satisfying formula (1) and formula (3) to introduce the size and arrangement of the nano-pillar structure.

[0107] Optionally, in some embodiments, the phase modulation provided by the nanorod structure 12 satisfies formula (5):

[0108]

[0109] in, is the phase of the nanorod structure 12 , n is the equivalent refractive index, λ is the wavelength, and h is the height of the nanorod structure 12 .

[0110] It should be noted that the equivalent refractive index is related to the diameter of the nanorod structure. In other words, the phase modulation provided by the nanorod structure 12 is related to the diameter of the nanorod structure 12 and the height of the nanorod structure.

[0111] In the embodiment of the present application, the plurality of nano-column structures 12 may be arranged at equal intervals on the image side of the substrate 11. In the embodiment of the present application, the interval between two adjacent nano-column structures 12 is not specifically limited and may be determined according to actual needs. Optionally, in some embodiments, the interval between two adjacent nano-column structures 12 may be between 200-400 nm.

[0112] Optionally, in some embodiments, the interval between two adjacent nanorod structures 12 is 360 nm.

[0113] In the embodiment of the present application, the diameter and / or height of the nanorod structure 12 can be adjusted so that the phase modulation provided by the nanorod structure 12 can respectively satisfy the phase determined according to the first wavelength and the phase determined according to the second wavelength.

[0114] In a possible implementation, the heights of the multiple nano-pillar structures 12 may be the same. Similarly, in the embodiments of the present application, the height of the nano-pillar structure 12 is not specifically limited. Optionally, in some embodiments, the height of the nano-pillar structure 12 may be between 600nm and 1500nm. In the following, the height of the multiple nano-pillar structures 12 is 1000nm as an example. In combination with formula (5), Figure 4 The phase diagram of the nanorod structure with different diameters at the same height provided by the embodiment of the present application is shown.

[0115] like Figure 4 As shown in the figure, the solid line represents the phase change of the nanorod structure 12 with different diameters at the same height for the light of the first wavelength (taking 940nm as an example), and the dotted line represents the phase change of the nanorod structure 12 with different diameters at the same height for the light of the second wavelength (taking 550nm as an example). The ordinate is the phase, and the abscissa is the diameter of the nanorod structure 12 (in μm). Figure 4 It is not difficult to see that for different wavelengths, the phase modulation provided by the nanorod structure 12 of the same diameter is different. Therefore, after determining the phase of each nanorod structure 12 for the first wavelength and the second wavelength according to formula (1) and formula (3), it can be calculated according to Figure 4 The diameter of the nanorod structure 12 that satisfies both formula (1) and formula (3) is determined.

[0116] For example, the nanorod structure 12#1 is the nanorod structure 12 at position #1 of the superlens 1. According to formula (1), it can be determined that the phase corresponding to the position #1 for the first wavelength is 4 rad. According to formula (2), it can be determined that the phase corresponding to the position #1 for the second wavelength is 5.2 rad. Figure 4 It can be seen that when the height of the nanorod structure is 1000 nm and the diameter of the nanorod structure 12 is 100 nm, the phases calculated by formula (1) and formula (3) can be satisfied at the same time.

[0117] Similarly, the phase distribution of the nanorod structure 12 described in the embodiment of the present application satisfies formulas (1) and (3) at the same time, which means that the phase distribution satisfies formulas (1) and (3) within the error range, but does not mean that the phase is completely the same as the phase calculated according to formulas (1) and (3). Figure 4Assuming that the allowable error is 0.5 rad, according to formula (1), for the first wavelength, the phase of position #1 of superlens #1 is 2 rad, and according to formula (3), for the second wavelength, the phase of position #1 of superlens 1 is 4 rad. When determining the aperture of the nanocolumn structure 12 at position #1, it can be seen that the aperture of the nanocolumn structure is 50 nm, and its phases corresponding to the first wavelength and the second wavelength are 2.1 rad and 3.9 rad respectively, which meets the error requirements. It can be determined that the height of the nanocolumn structure at position #1 of superlens #1 is 1000 nm and the aperture is 50 nm.

[0118] Similarly, when the height of the nanocolumn structure 12 at each position is determined, the aperture of the nanocolumn structure 12 at each position of the superlens 1 can be determined in combination with the above analysis, thereby determining the size of the nanocolumn structure 12 at each position, so that the phase of the nanocolumn structure 12 at each position can simultaneously satisfy the phase determined according to formulas (1) and (3).

[0119] Figure 5 A schematic diagram showing the distribution of the apertures of multiple nano-column structures provided in an embodiment of the present application as a function of position is shown.

[0120] like Figure 5 As shown, the horizontal axis of the distribution diagram is the distance between the nanorod structure 12 and the center point of the substrate 11, in micrometers (μm), and the vertical axis is the diameter of the nanorod structure 12, in micrometers (μm).

[0121] In a possible implementation, the apertures of the multiple nano-pillar structures 12 may be the same. Similar to the above, the phase diagram of the nano-pillar structures 12 of different heights under the same aperture can be obtained in combination with formula (5), and then the height 12 of the nano-pillar structure 12 at each position of the metalens 1 is determined according to the phase diagram, thereby determining the size of the nano-pillar structure 12 at each position, so that the phase of the nano-pillar structure 12 at each position can simultaneously satisfy the phase determined according to formulas (1) and (3).

[0122] In a possible implementation, at least two of the plurality of nano-pillar structures 12 have different diameters and heights. Different from the above two methods, in this possible implementation, the height and diameter of each nano-pillar structure 12 can be adjusted one by one, so as to determine the size of the nano-pillar structure 12 at each position, so that the phase of the nano-pillar structure 12 at each position can simultaneously satisfy the phase determined according to formulas (1) and (3).

[0123] Figure 6 A schematic diagram of the superlens simulation effect provided by an embodiment of the present application is shown.

[0124] like Figure 6 As shown, after the size of each nanorod structure 12 is determined, the incident light passes through the phase of the super lens 1, which can focus the infrared light and divide the visible light into multiple sub-beams, which are projected at a certain deflection angle.

[0125] In the embodiment of the present application, by rationally arranging the nanocolumn structure of the superlens, when the incident light beam passes through the superlens, the infrared light corresponding to the first wavelength and the visible light corresponding to the second wavelength can be phase modulated to focus the infrared light, and the visible light can be split and processed. Without two sets of camera modules, depth measurement and multi-spectral imaging functions can be achieved with only one optical lens, saving space and manufacturing costs of electronic equipment.

[0126] Figure 7 A schematic cross-sectional view and a schematic top view of another optical lens provided in an embodiment of the present application are shown, and Figure 3 Different from the optical lens shown, in this embodiment, the superlens 1 can be divided into a first part and a second part, wherein the first part is used to focus infrared light and the second part is used to perform spectroscopic processing on visible light, wherein the first part is the middle part of the superlens 1 and the second part is the part other than the first part.

[0127] Optionally, in some embodiments, the phases of the multiple nano-pillar structures 12 of the first part of the super-lens 1 satisfy the second distribution, that is, the phase of each nano-pillar structure 12 of the first part satisfies the phase determined according to the first wavelength, so that the super-lens focuses infrared light, and the first wavelength is the wavelength of infrared light.

[0128] Optionally, in some embodiments, the phase distribution of each nanorod structure 12 of the first portion may satisfy formula (1) or (2).

[0129] It is understandable that the description of the phase distribution of each nanorod structure 12 in the first part satisfying formula (1) or (2) can be found above, and will not be repeated here for the sake of brevity.

[0130] Optionally, in some embodiments, the phases of the multiple nanocolumn structures 12 of the second part of the superlens 1 satisfy the third distribution, that is, the phase of each nanocolumn structure 12 of the second part satisfies the phase determined according to the second wavelength, so that the superlens separates visible light, and the second wavelength is the wavelength corresponding to the visible light.

[0131] Optionally, in some embodiments, the phase distribution of each nanorod structure 12 of the second portion of the superlens 1 may satisfy formula (3) or (4).

[0132] It is understandable that the description of the phase distribution of the plurality of nanorod structures 12 in the second portion satisfying formula (3) or (4) can be found above, and will not be repeated here for the sake of brevity.

[0133] Figure 8 A schematic diagram of the superlens simulation effect provided by an embodiment of the present application is shown.

[0134] like Figure 8 As shown, after the size of each nanorod structure 12 is determined, the incident light passes through the phase of the super lens 1, which can focus the infrared light and divide the visible light into multiple sub-beams, which are projected at a certain deflection angle.

[0135] In the embodiment of the present application, the superlens is divided into two parts. By reasonably arranging the nanocolumn structures of the two parts, the first part and the second part are respectively used to phase modulate the infrared light corresponding to the first wavelength and the visible light corresponding to the second wavelength, so that after the incident light beam passes through the optical lens, the optical lens can focus the infrared light in the incident light beam and perform spectral processing on the visible light. There is no need for two sets of camera modules. Depth measurement and multi-spectral imaging functions can be achieved with only one optical lens, saving space and manufacturing costs of electronic equipment.

[0136] Fig. 9 FIG. 1 shows an exploded view of the lens module 103 provided in an embodiment of the present application. Fig. 9 As shown, the lens module 103 includes an optical lens 201 and an image sensor 202 , wherein the optical lens 201 is used to focus infrared light on a first area of ​​the image sensor 202 , and is also used to divide visible light into multiple sub-beams to be projected onto a second area of ​​the image sensor 202 .

[0137] It should be understood that the description of the optical lens 201 can be found above, and for the sake of brevity, it will not be repeated here.

[0138] Optionally, in some embodiments, in order to avoid interference from visible light, a filter is further provided between the optical lens 201 and the first area of ​​the image sensor 202 , and the filter is used to filter the visible light.

[0139] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0140] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An optical lens, characterized in that: The optical lens comprises a super lens and a lens barrel, wherein the super lens is accommodated in the lens barrel, and the super lens comprises a substrate and a plurality of nano column structures, wherein the plurality of nano column structures are fixed to the image side of the substrate; The phase of each nanorod structure satisfies the phase determined according to the first wavelength so that the superlens focuses the infrared light, and the first wavelength is the wavelength corresponding to the infrared light; The phase of each nanocolumn structure also satisfies the phase determined according to the second wavelength so that the superlens splits the visible light, and the second wavelength is the wavelength corresponding to the visible light.

2. The optical lens according to claim 1, characterized in that: The phase of each nanorod structure satisfies any one of the following formulas (1) or (2), and also satisfies any one of the following formulas (3) or (4), in, is the phase of each nanorod structure for the first wavelength, r is the distance from each nanorod structure to the center of the substrate, f is the focal length, λ1 is the first wavelength, and a i is the first adjustment parameter, is the phase of each nanorod structure for the second wavelength, α is the deflection angle corresponding to the second wavelength, λ2 is the second wavelength, and b i is the second adjustment parameter, and R is the aperture of the substrate.

3. The optical lens according to claim 1 or 2, characterized in that: The heights of the multiple nano-column structures are between 600nm and 1500nm, and the distance between two adjacent nano-column structures in the multiple nano-column structures is between 200nm and 400nm.

4. The optical lens according to any one of claims 1 to 3, characterized in that: The first wavelength is 940 nm, and the second wavelength is 550 nm.

5. The optical lens according to any one of claims 1 to 4, characterized in that: The plurality of nanorod structures are rotationally symmetric structures and the rotation angle is 90°.

6. An optical lens, characterized in that: The optical lens comprises a super lens and a lens barrel, wherein the super lens is accommodated in the lens barrel, and the super lens comprises a substrate and a plurality of nano column structures, wherein the plurality of nano column structures are fixed to the image side of the substrate; The superlens includes a first part and a second part, the phase of each nanorod structure of the first part satisfies the phase determined according to the first wavelength so that the superlens focuses infrared light, and the first wavelength is the wavelength of the infrared light; The phase of each nanorod structure of the second part satisfies the phase determined according to the second wavelength so that the superlens splits the visible light, and the second wavelength is the wavelength of the visible light.

7. The optical lens according to claim 6, characterized in that: The phase of each nanorod structure of the first part satisfies any one of the following formulas (1) or (2), and the phase of each nanorod structure of the second part satisfies any one of the following formulas (3) or (4), in, is the phase of each nanorod structure in the first part for the first wavelength, r is the distance from each nanorod structure in the first part to the center of the substrate, f is the focal length, λ1 is the first wavelength, a i is the first adjustment parameter, is the phase of each nanorod structure of the second part of the second wavelength, α is the deflection angle corresponding to the second wavelength, λ2 is the second wavelength, and b i is the second adjustment parameter, and R is the aperture of the substrate.

8. The optical lens according to claim 6 or 7, characterized in that: The heights of the multiple nano-column structures are between 600nm and 1500nm, and the distance between two adjacent nano-column structures in the multiple nano-column structures is between 200nm and 400nm.

9. The optical lens according to any one of claims 6 to 8, characterized in that: The first wavelength is 940 nm, and the second wavelength is 550 nm.

10. The optical lens according to any one of claims 6 to 9, characterized in that: The plurality of nanorod structures are rotationally symmetric structures and the rotation angle is 90°.

11. A lens module, characterized in that: The lens module includes an optical lens and an image sensor as described in any one of claims 1 to 5, wherein the optical lens is used to focus infrared light on a first area of ​​the image sensor and to divide visible light into multiple sub-beams and project them to a second area of ​​the image sensor, wherein the first area and the second area are different.

12. The lens module according to claim 11, characterized in that: The lens module also includes a filter, which is arranged between the optical lens and the first area of ​​the image sensor, and is used to filter the visible light.

13. A lens module, characterized in that: The lens module includes the optical lens and image sensor as described in any one of claims 6 to 10, wherein the optical lens is used to focus infrared light on a first area of ​​the image sensor and to divide visible light into multiple sub-beams and project them to a second area of ​​the image sensor, wherein the first area and the second area are different.

14. The lens module according to claim 13, characterized in that: The lens module also includes a filter, which is arranged between the optical lens and the first area of ​​the image sensor, and is used to filter the visible light.

15. An electronic device, characterized in that: Comprising a lens module as described in any one of claims 11 to 14.

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