A visible light optical system and a visible light optical lens

Abstract

This application discloses a visible light optical system and a visible light optical lens. The visible light optical system includes a superlens, a first aspherical lens, a second aspherical lens, a third aspherical lens, and a fourth aspherical lens. The first, second, third, and fourth aspherical lenses are arranged sequentially along the optical axis from the object side to the image side. The superlens has a positive optical power. The first aspherical lens has a positive optical power, and both its object-side and image-side surfaces are convex towards the object side. The second aspherical lens has a negative optical power, and both its object-side and image-side surfaces are convex towards the image side. The third aspherical lens has a positive optical power, and both its object-side and image-side surfaces are convex towards the image side. The fourth aspherical lens has a negative optical power. The visible light optical system combines a superlens with a traditional refractive lens, giving it advantages such as low cost, small size, and excellent imaging quality.

Description

Technical Field

[0001] This application relates to the field of optical systems, and more particularly to a visible light optical system and a visible light optical lens. Background Technology

[0002] As the market demands increasingly higher imaging quality from optical systems, existing technologies typically employ methods such as bonding or separating positive and negative lenses to correct aberrations and improve the imaging quality of optical systems. However, these methods result in optical systems that are large in size, have a large number of lenses, and are costly, making them less advantageous in terms of size and cost.

[0003] Therefore, there is an urgent need to provide an optical system that is small in size, low in cost, and has excellent imaging quality through optimized design. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a visible light optical system and a visible light optical lens, aiming to provide an optical system that is small in size, low in cost, and has excellent imaging quality.

[0005] According to one aspect of the embodiments of this application, a visible light optical system is disclosed, the visible light optical system comprising: a superlens, a first aspherical lens, a second aspherical lens, a third aspherical lens and a fourth aspherical lens, wherein the first aspherical lens, the second aspherical lens, the third aspherical lens and the fourth aspherical lens are arranged sequentially from the object side to the image side along the optical axis;

[0006] The optical power of the superlens is positive; the optical power of the first aspherical lens is positive, the object-side surface of the first aspherical lens is convex towards the object side, and the image-side surface of the first aspherical lens is convex towards the object side; the optical power of the second aspherical lens is negative, the object-side surface of the second aspherical lens is convex towards the image side, and the image-side surface of the second aspherical lens is convex towards the image side; the optical power of the third aspherical lens is positive, the object-side surface of the third aspherical lens is convex towards the image side, and the image-side surface of the third aspherical lens is convex towards the image side; the optical power of the fourth aspherical lens is negative.

[0007] In some embodiments, the first aspherical lens, the superlens, the second aspherical lens, the third aspherical lens, and the fourth aspherical lens are arranged sequentially along the optical axis from the object side to the image side; the visible light optical system satisfies: ,in, The effective focal length of the visible light optical system is... The entrance pupil diameter of the visible light optical system is given.

[0008] In some embodiments, the visible light optical system satisfies: ,in, The total optical length of the visible light optical system is given. This is the maximum full field of view of the visible light optical system; This is the optical back focal length of the visible light optical system. The effective focal length of the visible light optical system is given.

[0009] In some embodiments, the visible light optical system satisfies: ,in, The incident angle of the principal ray of the visible light optical system is [angle of incidence]. The length of the diagonal of the imaging area of ​​the visible light optical system on the image plane is half of the length of the image. The total optical length of the visible light optical system is given.

[0010] In some embodiments, the visible light optical system satisfies: ,in, Let be the radius of curvature of the object-side surface of the fourth aspherical lens. Let be the radius of curvature of the image-side surface of the fourth aspherical lens. The focal length of the fourth aspherical lens is... The effective focal length of the visible light optical system is given.

[0011] In some embodiments, the visible light optical system satisfies: , Let be the focal length of the first aspherical lens. Let be the focal length of the second aspherical lens. The focal length of the third aspherical lens is... The focal length of the fourth aspherical lens is... Let be the focal length of the superlens.

[0012] In some embodiments, the superlens satisfies: ,in, The difference between the maximum and minimum optical power of the superlens in the operating wavelength band. It is the unit of diopter.

[0013] In some embodiments, the visible light optical system satisfies: ,in, The effective focal length of the visible light optical system is... The maximum absolute value of the phase provided by the superlens. The radius of the maximum effective area of ​​the superlens is [missing information]. Let be the focal length of the superlens.

[0014] In some embodiments, the visible light optical system further includes a fifth aspherical lens, which is cemented to the image-side surface of the superlens, and the image-side surface of the fifth aspherical lens convexes toward the object side.

[0015] A second aspect of this application provides a visible light optical lens, the visible light optical lens comprising: an image sensor and a visible light optical system as described in any of the preceding claims; the image sensor is disposed on the image plane of the visible light optical system.

[0016] The visible light optical system provided in this application includes a superlens, a first aspherical lens, a second aspherical lens, a third aspherical lens, and a fourth aspherical lens, wherein the first, second, third, and fourth aspherical lenses are arranged sequentially along the optical axis from the object side to the image side. The superlens has a positive optical power; the first aspherical lens has a positive optical power, with its object-side and image-side surfaces convex towards the object side; the second aspherical lens has a negative optical power, with its object-side and image-side surfaces convex towards the image side; the third aspherical lens has a positive optical power, with its object-side and image-side surfaces convex towards the image side; and the fourth aspherical lens has a negative optical power. The visible light optical system provided in this application uses a combination of a superlens and a traditional refractive lens to correct aberrations in the visible light optical system, thereby enabling the visible light optical system to have excellent imaging quality. Because visible light optical systems have fewer lenses and a shorter overall optical length, they have the advantages of lower cost and smaller size. Attached Figure Description

[0017] The above and other objectives, features and advantages of this application will become more apparent from a detailed description of exemplary embodiments thereof with reference to the accompanying drawings.

[0018] Figure 1 A schematic diagram of the architecture layout of a visible light optical system according to an embodiment of this application is shown.

[0019] Figure 2 The diagram shows the phase distribution of a superlens in a visible light optical system according to an embodiment of this application.

[0020] Figure 3 The MTF field-of-view curve of a superlens in a visible light optical system according to an embodiment of this application is shown.

[0021] Figure 4 The field curve of a superlens in a visible light optical system according to an embodiment of this application is shown.

[0022] Figure 5The distortion diagram of a superlens in a visible light optical system according to an embodiment of this application is shown.

[0023] Figure 6 A schematic diagram of the architecture layout of a visible light optical system according to an embodiment of this application is shown.

[0024] Figure 7 The diagram shows the phase distribution of a superlens in a visible light optical system according to an embodiment of this application.

[0025] Figure 8 The MTF field-of-view curve of a superlens in a visible light optical system according to an embodiment of this application is shown.

[0026] Figure 9 The field curve of a superlens in a visible light optical system according to an embodiment of this application is shown.

[0027] Figure 10 The distortion diagram of a superlens in a visible light optical system according to an embodiment of this application is shown.

[0028] Figure 11 A schematic diagram of the architecture layout of a visible light optical system according to an embodiment of this application is shown.

[0029] Figure 12 The diagram shows the phase distribution of a superlens in a visible light optical system according to an embodiment of this application.

[0030] Figure 13 The MTF field-of-view curve of a superlens in a visible light optical system according to an embodiment of this application is shown.

[0031] Figure 14 The field curve of a superlens in a visible light optical system according to an embodiment of this application is shown.

[0032] Figure 15 The distortion diagram of a superlens in a visible light optical system according to an embodiment of this application is shown.

[0033] Figure 16 A schematic diagram of the architecture layout of a visible light optical system according to an embodiment of this application is shown.

[0034] Figure 17 The diagram shows the phase distribution of a superlens in a visible light optical system according to an embodiment of this application.

[0035] Figure 18 The MTF field-of-view curve of a superlens in a visible light optical system according to an embodiment of this application is shown.

[0036] Figure 19 The field curve of a superlens in a visible light optical system according to an embodiment of this application is shown.

[0037] Figure 20 The distortion diagram of a superlens in a visible light optical system according to an embodiment of this application is shown.

[0038] Figure 21 A schematic diagram of the architecture layout of a visible light optical system according to an embodiment of this application is shown.

[0039] Figure 22 The diagram shows the phase distribution of a superlens in a visible light optical system according to an embodiment of this application.

[0040] Figure 23 The MTF field-of-view curve of a superlens in a visible light optical system according to an embodiment of this application is shown.

[0041] Figure 24 The field curve of a superlens in a visible light optical system according to an embodiment of this application is shown.

[0042] Figure 25 The distortion diagram of a superlens in a visible light optical system according to an embodiment of this application is shown.

[0043] Figure Labels

[0044] 100. Visible light optical systems;

[0045] 10. First aspherical lens;

[0046] 20. Superlens; 210. Substrate; 220. Micro / nanostructure;

[0047] 30. Second aspherical lens;

[0048] 40. Third aspherical lens;

[0049] 50. The fourth aspherical lens;

[0050] 60. The fifth aspherical lens;

[0051] 70. Aperture; 80. Filter; 90. Optical axis;

[0052] 200, object plane; 300, image plane. Detailed Implementation

[0053] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided to make the description of this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The drawings are merely illustrative of this application and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0054] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more exemplary embodiments. Numerous specific details are provided in the following description to give a full understanding of exemplary embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced with one or more specific details omitted, or other modules, components, etc., can be employed. In other instances, well-known structures, methods, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0055] This application provides a visible light optical system 100. Please refer to [link / reference]. Figure 1 , Figure 1 A schematic diagram of the architectural layout of a visible light optical system 100 according to an embodiment of this application is shown. The image formed by the visible light optical system 100 is located to the right of the rightmost lens, which is the image side of the visible light optical system 100, with image plane 300 located on the image side. The left side of the leftmost lens is the object side of the visible light optical system 100, with object plane 200 located on the object side. Therefore, the direction along the optical axis 90 from the object side to the image side is consistent with the direction along the optical axis 90 from object plane 200 to image plane 300. For ease of description, the side of each optical element in the visible light optical system 100 closest to the object side is referred to as the object side surface of that optical element, and the side of each optical element in the visible light optical system 100 closest to the image side is referred to as the image side surface of that optical element. For example, the surface of the superlens 20 closest to the image side is referred to as the image side surface of the superlens 20.

[0056] Please refer to it again. Figure 1 The visible light optical system 100 includes a superlens 20, a first aspherical lens 10, a second aspherical lens 30, a third aspherical lens 40, and a fourth aspherical lens 50, wherein the first aspherical lens 10, the second aspherical lens 30, the third aspherical lens 40, and the fourth aspherical lens 50 are arranged sequentially from the object side to the image side along the optical axis 90. The position of the superlens 20 is not fixed; the superlens 20 can be positioned between any two adjacent lenses. That is, the superlens 20 can be positioned between the first aspherical lens 10 and the second aspherical lens 30, or between the second aspherical lens 30 and the third aspherical lens 40, or between the third aspherical lens 40 and the fourth aspherical lens 50.

[0057] The superlens 20 has positive optical power and includes a substrate 210 and a micro / nano structure 220. The micro / nano structure 220 is a subwavelength structure and is disposed on the object-side and / or image-side of the substrate 210. For details, please refer to... Figure 1 , Figure 6 , Figure 11 and Figure 21 In some embodiments, the micro / nano structure 220 is disposed on the object-side surface of the substrate 210; see also Figure 16 In some embodiments, the micro / nano structure 220 is disposed on the image side of the substrate 210.

[0058] By configuring the parameters of the micro / nano structure 220, the superlens 20 can acquire the desired performance. The superlens 20 has different optical powers at different wavelengths. By rationally arranging the micro / nano structure 220, a broadband achromatic effect can be achieved. At the same time, the optical power of the superlens 20 at each wavelength can correct the aberrations of the visible light optical system 100.

[0059] It should be noted that the number of superlenses 20 included in the visible light optical system 100 is not limited to one. That is, two or more superlenses of other specifications (different from the superlenses 20 provided in this application) can be used to achieve the target phase gradient so that the visible light optical system 100 has the expected optical performance.

[0060] The optical power of the first aspherical lens 10 is positive, the object side of the first aspherical lens 10 is convex to the object side, and the image side of the first aspherical lens 10 is convex to the object side.

[0061] The second aspherical lens 30 has a negative optical power, and the object side of the second aspherical lens 30 is convex to the image side, while the image side of the second aspherical lens 30 is convex to the image side.

[0062] The third aspherical lens 40 has a positive optical power, and its object-side surface is convex towards the image side, while its image-side surface is also convex towards the image side. The fourth aspherical lens 50 has a negative optical power.

[0063] The visible light optical system 100 provided in this application uses a combination of a superlens 20 and a traditional refractive lens to correct aberrations, thereby giving the visible light optical system 100 excellent imaging quality. Because the visible light optical system 100 has a small number of lenses and a short total optical length, it has the advantages of low cost and small size.

[0064] Please see Figure 1 , Figure 6 , Figure 11 , Figure 16 and Figure 21 In some embodiments, the paraxial region of the object side of the fourth aspherical lens 50 convexes toward the image side, and the paraxial region of the image side of the fourth aspherical lens 50 convexes toward the object side. In this application, the paraxial region refers to an extremely narrow region where the angle between the light ray and the optical axis 90 is extremely small during propagation and is only distributed near the optical axis 90.

[0065] Please refer to it again. Figure 1 , Figure 6 , Figure 11 , Figure 16 and Figure 21 In some embodiments, the image-side surface of the fourth aspherical lens 50 has a recurved point.

[0066] Please see Figure 1 , Figure 6 , Figure 11 , Figure 16 and Figure 21 In some embodiments, the visible light optical system 100 includes a superlens 20, a first aspherical lens 10, a second aspherical lens 30, a third aspherical lens 40, and a fourth aspherical lens 50, wherein the first aspherical lens 10, the superlens 20, the second aspherical lens 30, the third aspherical lens 40, and the fourth aspherical lens 50 are arranged sequentially from the object side to the image side along the optical axis 90.

[0067] In some embodiments, the visible light optical system 100 further includes a fifth aspherical lens 60. The sign of the focal length of the fifth aspherical lens 60 is not entirely consistent in different embodiments; that is, the focal length of the fifth aspherical lens 60 can be positive or negative in different embodiments. The fifth aspherical lens 60 is cemented with the superlens 20 to form a cemented lens group, which allows the visible light optical system 100 to have a high degree of design freedom.

[0068] Specifically, the image-side surface of the fifth aspherical lens 60 is cemented to the image-side surface of the superlens 20, and the image-side surface of the fifth aspherical lens 60 convexes towards the object side. Since the fifth aspherical lens 60 is cemented to the superlens 20, the position of the fifth aspherical lens 60 in the optical system depends on the position of the superlens 20 in the visible light optical system 100.

[0069] Further, please refer to Figure 6 and Figure 16 In some embodiments, the visible light optical system 100 further includes a fifth aspherical lens 60, wherein the first aspherical lens 10, the superlens 20, the fifth aspherical lens 60, the second aspherical lens 30, the third aspherical lens 40 and the fourth aspherical lens 50 are arranged sequentially from the object side to the image side along the optical axis 90, so that the visible light optical system 100 has excellent imaging quality.

[0070] Furthermore, please refer to Figure 16 In some embodiments, when the first aspherical lens 10, the superlens 20, the fifth aspherical lens 60, the second aspherical lens 30, the third aspherical lens 40 and the fourth aspherical lens 50 are arranged sequentially from the object side to the image side along the optical axis 90, the micro / nano structure 220 is disposed on the image side of the substrate 210.

[0071] Furthermore, please refer to Figure 6 In some embodiments, when the first aspherical lens 10, the superlens 20, the fifth aspherical lens 60, the second aspherical lens 30, the third aspherical lens 40, and the fourth aspherical lens 50 are arranged sequentially from the object side to the image side along the optical axis 90, the micro / nano structure 220 is disposed on the object side of the substrate 210, and the fifth aspherical lens 60 is cemented to the image side of the substrate 210. Since the micro / nano structure 220 and the fifth aspherical lens 60 are located on opposite sides of the substrate 210, they can be processed separately on both sides of the substrate 210, which facilitates the processing of the superlens 20 and the fifth aspherical lens 60.

[0072] Furthermore, in some embodiments, when the first aspherical lens 10, the superlens 20, the fifth aspherical lens 60, the second aspherical lens 30, the third aspherical lens 40, and the fourth aspherical lens 50 are arranged sequentially from the object side to the image side along the optical axis 90, the micro / nano structure 220 is disposed on the object side and the image side of the substrate 210, so that the superlens 20 has a higher degree of design freedom.

[0073] In some embodiments, the visible light optical system 100 further includes a fifth aspherical lens 60, which is made of photoresist. The fifth aspherical lens 60 is obtained by coating photoresist on the superlens 20 and processing the coated photoresist using a photolithography process to process the surface of the photoresist away from the substrate 210 into a target shape.

[0074] Specifically, please refer to Figure 6 When the micro / nano structure 220 and the fifth aspherical lens 60 are located on opposite sides of the substrate 210, photoresist can be directly coated onto the side where the substrate 210 and the fifth aspherical lens 60 are bonded, and the photoresist can be processed to obtain a cemented lens assembly formed by bonding the superlens 20 and the fifth aspherical lens 60. Please refer to [link to relevant documentation]. Figure 16 When the micro / nano structure 220 and the fifth aspherical lens 60 are located on the same side of the substrate 210, after the micro / nano structure 220 is fabricated, the micro / nano structure 220 is filled, and photoresist is coated on the interface after filling. The photoresist is then processed to obtain a cemented lens assembly formed by bonding the superlens 20 and the fifth aspherical lens 60.

[0075] Since the superlens 20 can be manufactured using photolithography, the manufacturing processes of the superlens 20 and the fifth aspherical lens 60 are compatible. After the superlens 20 is manufactured, the fifth aspherical lens 60 can be fabricated based on the superlens 20 to obtain a cemented lens assembly formed by bonding the superlens 20 and the fifth aspherical lens 60 together. The manufacturing process of the fifth aspherical lens 60 provided in this application has the advantages of being more convenient and having fewer steps compared to the process of separately manufacturing the superlens 20 and the fifth aspherical lens 60 and then bonding them together.

[0076] In some embodiments, the first aspherical lens 10, the superlens 20, the second aspherical lens 30, the third aspherical lens 40, and the fourth aspherical lens 50 are arranged sequentially along the optical axis from the object side to the image side, and the visible light optical system 100 satisfies condition one: ,in, The effective focal length of the visible light optical system 100. (Entrance PupilDiameter, abbreviated) ) is the entrance pupil diameter of the visible light optical system 100. , They have the same dimensions, both being units of length, such as millimeters.

[0077] Condition 1 reflects the range of the F-number of the visible light optical system 100. As can be seen from condition 1, the visible light optical system 100 has a smaller F-number and a larger amount of light entering the system, thus ensuring that the image formed by the visible light optical system 100 is clearer and brighter.

[0078] In some embodiments, the visible light optical system 100 satisfies condition two: ,in, (Field of View, abbreviated as) () represents the maximum full field of view of the visible light optical system 100. The unit is degrees. (Total Track Length, abbreviated as...) ( ) represents the total optical length of the visible light optical system 100. (Back focal length, abbreviated) () is the optical back focal length of the visible light optical system 100. The effective focal length of the visible light optical system 100. , , They have the same dimensions, both being units of length, such as millimeters.

[0079] Condition 2 ensures that the visible light optical system 100 has a small total optical length while meeting the target specifications, thereby ensuring that the visible light optical system 100 has a small volume.

[0080] In some embodiments, the visible light optical system 100 satisfies condition three: ,in, (Chief Ray Angle, ( ) is the incident angle of the principal ray of the visible light optical system 100. The unit is degrees. It is half the diagonal length of the imaging area of ​​the visible light optical system 100 on the image plane 300, that is The image height of the visible light optical system 100. The total optical length of the visible light optical system 100. , They have the same dimensions, both being units of length, such as millimeters.

[0081] Equation 3 characterizes the contribution of the principal ray incident angle to the compressed volume in the system. The lower limit of Equation 3 represents the maximum total optical length that can be achieved when the principal ray incident angle constraint is lifted, and the upper limit of Equation 3 represents the maximum volume compression capability that the principal ray incident angle can provide.

[0082] In some embodiments, the visible light optical system 100 satisfies condition four: ,in, Let be the radius of curvature of the object-side surface of the fourth aspherical lens 50. Let be the radius of curvature of the image-side surface of the fourth aspherical lens 50. The focal length of the fourth aspherical lens 50 is... The effective focal length of the visible light optical system 100. , , , They have the same dimensions, both being units of length, such as millimeters.

[0083] Condition four is used to ensure that the fourth aspherical lens 50 has sufficient light deflection capability, while also ensuring that the fourth aspherical lens 50 has a reasonable shape, so that the fourth aspherical lens 50 has good manufacturability.

[0084] In some embodiments, the visible light optical system 100 satisfies condition five: , The focal length of the first aspherical lens 10 is... The focal length of the second aspherical lens 30. The focal length of the third aspherical lens is 40. The focal length of the fourth aspherical lens 50 is... This is the focal length of the superlens 20. , , , , They have the same dimensions, both being units of length, such as millimeters.

[0085] The lower limit of conditional expression 5 can prevent the superlens 20 from being unmanufacturable due to excessive optical focal length, while the upper limit of conditional expression 5 can ensure that the superlens 20 can correct chromatic aberration in the visible light optical system 100.

[0086] In some embodiments, the superlens 20 satisfies condition six: ,in, This represents the difference between the maximum and minimum optical power of the superlens 20 in the operating wavelength band. (Diopter, abbreviated) () is the unit of diopter. .

[0087] Condition 6 reflects the chromatic aberration correction capability of the superlens 20. The lower limit of condition 6 represents the minimum chromatic aberration correction requirement of the superlens 20 for the entire visible light optical system 100 and its specific lens arrangement and structure. The upper limit of condition 6 represents the maximum chromatic aberration correction capability that the superlens 20 can provide in the visible light optical system 100.

[0088] In some embodiments, the visible light optical system 100 satisfies condition seven: ,in, The maximum absolute value of the phase provided by the superlens 20. The unit is If both the object-side and image-side surfaces of the substrate 210 are provided with micro / nano structures 220, then the superlens 20 is a double-sided superlens. In this case, the superlens 20 is selected based on the larger maximum phase value provided by the object-side and image-side surfaces. . The effective focal length of the visible light optical system 100. This is the focal length of the superlens 20. The radius of the maximum effective area of ​​the superlens 20 refers to the radius of its maximum light-transmitting area. Regardless of whether the superlens 20 is a double-sided or single-sided superlens, the larger of the radius of the maximum light-transmitting area on the object side and the radius of the maximum light-transmitting area on the image side of the superlens 20 is selected as the maximum effective area radius. . , , They have the same dimensions, both being units of length, such as millimeters.

[0089] Condition 7 represents the spatial phase provided by the superlens 20 per unit radius. The upper limit of condition 7 represents the maximum spatial phase that the superlens 20 can provide per unit radius in the visible light optical system. The lower limit of condition 7 represents the minimum spatial phase per unit radius required by the superlens 20 to achieve the target optical performance and reduce volume in the visible light optical system 100.

[0090] In some embodiments, the visible light optical system 100 satisfies condition eight: ,in, The Abbe number of the second aspherical lens is 30. The Abbe number of the third aspherical lens is 40. This is the Abbe number of the fourth aspherical lens, 50.

[0091] The visible light optical system 100 satisfies condition eight, which helps to balance the chromatic aberration of the visible light optical system 100 and can improve the imaging resolution of the visible light optical system 100.

[0092] The visible light optical system 100 also includes an aperture 70, which is used to control the amount of light entering the visible light optical system 100, ensuring that the visible light optical system 100 can work effectively and generate high-quality images. The aperture 70 is disposed in the optical path of the visible light optical system 100.

[0093] In some embodiments, when the visible light optical system 100 includes a superlens 20, a first aspherical lens 10, a second aspherical lens 30, a third aspherical lens 40, and a fourth aspherical lens 50, the aperture stop 70 may be disposed in the following positions: (1) the aperture stop 70 is disposed on the object side of the first aspherical lens 10, and the aperture stop 70 is spaced apart from the first aspherical lens 10; (2) Please refer to Figure 1 , Figure 6 , Figure 11 and Figure 16 (2) The aperture 70 is disposed on the object side of the first aspherical lens 10, that is, the aperture 70 is disposed in contact with the object side of the first aspherical lens 10; (3) The aperture 70 is disposed on the image side of the first aspherical lens 10, that is, the aperture 70 is disposed in contact with the image side of the first aspherical lens 10; (4) Please refer to Figure 21(5) The aperture 70 is disposed between the first aspherical lens 10 and the superlens 20, and the aperture 70 has a target distance from both the first aspherical lens 10 and the superlens 20; (6) The aperture 70 is disposed on the object side of the superlens 20, that is, the aperture 70 is attached to the object side of the superlens 20; (7) The aperture 70 is disposed between the superlens 20 and the second aspherical lens 30, and the aperture 70 has a target distance from both the superlens 20 and the second aspherical lens 30; (8) The aperture 70 is disposed on the object side of the second aspherical lens 30, that is, the aperture 70 is attached to the object side of the second aspherical lens 30; (9) The aperture 70 is disposed on the image side of the second aspherical lens 30, that is, the aperture 70 is attached to the image side of the second aspherical lens 30. (10) The aperture 70 is located between the second aspherical lens 30 and the third aspherical lens 40, and the aperture 70 has a target distance from both the second aspherical lens 30 and the third aspherical lens 40; (11) The aperture 70 is located on the object side of the third aspherical lens 40, that is, the aperture 70 is attached to the object side of the third aspherical lens 40; (12) The aperture 70 is located on the image side of the third aspherical lens 40, that is, the aperture 70 is attached to the image side of the third aspherical lens 40; (13) The aperture 70 is located between the third aspherical lens 40 and the fourth aspherical lens 50, and the aperture 70 has a target distance from both the third aspherical lens 40 and the fourth aspherical lens 50; (14) The aperture 70 is located on the object side of the third aspherical lens 40, that is, the aperture 70 is attached to the object side of the third aspherical lens 40.

[0094] In some embodiments, the visible light optical system 100 includes a superlens 20, a first aspherical lens 10, a second aspherical lens 30, a third aspherical lens 40, a fourth aspherical lens 50, and a fifth aspherical lens 60. When the superlens 20 and the fifth aspherical lens 60 are cemented together to form a cemented lens assembly, the aperture stop 70 may be positioned as follows: (1) the aperture stop 70 is positioned on the object side of the first aspherical lens 10, and the aperture stop 70 is spaced apart from the first aspherical lens 10; (2) Please refer to [reference missing] Figure 1 , Figure 6 , Figure 11 and Figure 16 (2) The aperture 70 is disposed on the object side of the first aspherical lens 10, that is, the aperture 70 is disposed in contact with the object side of the first aspherical lens 10; (3) The aperture 70 is disposed on the image side of the first aspherical lens 10, that is, the aperture 70 is disposed in contact with the image side of the first aspherical lens 10; (4) Please refer to Figure 21(5) The aperture 70 is disposed between the first aspherical lens 10 and the cemented lens group, and the aperture 70 has a target distance from both the first aspherical lens 10 and the cemented lens group; (6) The aperture 70 is disposed on the object side of the cemented lens group, that is, the aperture 70 is attached to the object side of the cemented lens group; (7) The aperture 70 is disposed between the cemented lens group and the second aspherical lens 30, and the aperture 70 has a target distance from both the cemented lens group and the second aspherical lens 30; (8) The aperture 70 is disposed on the object side of the second aspherical lens 30, that is, the aperture 70 is attached to the object side of the second aspherical lens 30; (9) The aperture 70 is disposed on the image side of the second aspherical lens 30, that is, the aperture 70 is attached to the image side of the second aspherical lens 30. (10) The aperture 70 is disposed between the second aspherical lens 30 and the third aspherical lens 40, and the aperture 70 has a target distance from both the second aspherical lens 30 and the third aspherical lens 40; (11) The aperture 70 is disposed on the object side of the third aspherical lens 40, that is, the aperture 70 is attached to the object side of the third aspherical lens 40; (12) The aperture 70 is disposed on the image side of the third aspherical lens 40, that is, the aperture 70 is attached to the image side of the third aspherical lens 40; (13) The aperture 70 is disposed between the third aspherical lens 40 and the fourth aspherical lens 50, and the aperture 70 has a target distance from both the third aspherical lens 40 and the fourth aspherical lens 50; (14) The aperture 70 is disposed on the object side of the third aspherical lens 40, that is, the aperture 70 is attached to the object side of the third aspherical lens 40.

[0095] Please see Figure 1 , Figure 6 , Figure 11 , Figure 16 and Figure 21 In some embodiments, the visible light optical system 100 further includes a filter 80 located between the fourth aspherical lens 50 and the image plane 300, and the filter 80 is used to filter out light of other wavelengths besides visible light.

[0096] The visible light optical system 100 provided in this application has the following advantages:

[0097] (1) The total optical length is less than 3.1 mm;

[0098] (2) At a spatial frequency of 100 lp / mm, the MTF (Modulation Transfer Function) is greater than 0.35 across the entire field of view.

[0099] This application provides five visible light optical systems 100 that meet usage requirements in five exemplary embodiments. The visible light optical systems 100 provided in each embodiment of this application will be described in detail below.

[0100] Example 1

[0101] Figure 1 This paper shows a schematic diagram of the architectural layout of the visible light optical system 100 provided in Embodiment 1 of this application. Figure 1 The visible light optical system 100, along the optical axis 90 from the object plane 200 to the image plane 300, includes, in sequence: an aperture stop 70, a first aspherical lens 10, a superlens 20, a second aspherical lens 30, a third aspherical lens 40, a fourth aspherical lens 50, and a filter 80. Some parameters of the visible light optical system 100 provided in Embodiment 1 are shown in Table 1-1.

[0102] Table 1-1. Partial parameters of the visible light optical system 100 provided in Example 1

[0103]

[0104] As shown in Table 1-1, the total optical length of the visible light optical system 100 is relatively short, only 2.453 mm. The visible light optical system 100 provided in Example 1 has a relatively small volume and can be installed in various thin and light electronic products. The visible light optical system 100 has an F-number of 2.18, and the light intake of the visible light optical system 100 is relatively large, which can ensure that the image formed is relatively clear and bright. Along the optical axis 90 from the object plane 200 to the image plane 300, starting from the aperture stop 70, each surface in the visible light optical system 100 is numbered, and the parameters of each surface are summarized to obtain Table 1-2 below.

[0105] Table 1-2. Parameters of each surface in the visible light optical system 100 provided in Example 1

[0106]

[0107] For each surface in Table 1-2, surface 1 is the aperture stop 70, surface 2 is the object-side surface of the first aspherical lens 10, and surface 3 is the image-side surface of the first aspherical lens 10. Surface 4 is the image-side surface of the superlens 20. Since the micro / nano structure 220 is located on the image-side surface of the substrate 210, surface 4 is referred to as the structural surface. Surface 5 is the image-side surface of the superlens 20. Surface 6 is the object-side surface of the second aspherical lens 30, and surface 7 is the image-side surface of the second aspherical lens 30. Surface 8 is the object-side surface of the third aspherical lens 40, and surface 9 is the image-side surface of the third aspherical lens 40. Surface 10 is the object-side surface of the fourth aspherical lens 50, and surface 11 is the image-side surface of the fourth aspherical lens 50. Surface 12 is the object-side surface of the filter 80, and surface 13 is the image-side surface of the filter 80. Surface 14 is the image plane 300.

[0108] Combination Figure 1As shown in Table 1-2, surface 1 has an infinite radius of curvature, meaning it is a plane. The distance between surface 1 and surface 2 is -1.9E-01 mm, where the negative sign indicates that the vertex of surface 2 bulges out of surface 1 towards the object. Surface 2 has a radius of curvature of 7.0E-01 mm, and the distance between surface 2 and surface 3 is 2.7E-01 mm. The refractive index and Abbe number of the materials between surfaces 2 and 3 are 1.54 and 56, respectively. Surface 3 has a radius of curvature of 1.5E+00 mm, and the distance between surface 2 and surface 3 is 1.1E-01 mm. The material between surface 3 and surface 4 is air. Surface 4 has an infinite radius of curvature, meaning it is a plane. The distance between surface 4 and surface 5 is 2.0E-01 mm, and the refractive index and Abbe number of the materials between surfaces 4 and 5 are 1.46 and 67.8, respectively. Surface 5 has an infinite radius of curvature, meaning it is a plane. The distance between surfaces 5 and 6 is 8.3E-02 mm, and the material between them is air. Surface 6 has a radius of curvature of -5.0E+00 mm. The distance between surfaces 6 and 7 is 1.9E-01 mm, and the refractive index and Abbe number of the material between them are 1.66 and 20.4, respectively. Surface 7 has a radius of curvature of -5.8E+00 mm. The distance between surfaces 7 and 8 is 2.2E-01 mm, and the material between them is air. Surface 8 has a radius of curvature of -1.3E+00 mm. The distance between surfaces 8 and 9 is 2.5E-01 mm, and the refractive index and Abbe number of the material between them are 1.54 and 56, respectively. Surface 9 has a radius of curvature of -6.2E-01 mm, and the distance between surface 9 and surface 10 is 1.0E-01 mm. The material between surface 9 and surface 10 is air. Surface 10 has a radius of curvature of -7.9E+00 mm, and the distance between surface 10 and surface 11 is 3.2E-01 mm. The refractive index and Abbe number of the material between surface 10 and surface 11 are 1.54 and 56, respectively. Surface 11 has a radius of curvature of 9.0E-01 mm, and the distance between surface 11 and surface 12 is 1.1E-01 mm. The material between surface 11 and surface 12 is air. Surface 12 has an infinite radius of curvature (i.e., surface 12 is a plane), and the distance between surface 12 and surface 13 is 1.1E-01 mm. The refractive index and Abbe number of the material between surface 12 and surface 13 are 1.52 and 54.5, respectively. The radius of curvature of surface 13 is infinite, that is, surface 13 is a plane, the distance between surface 13 and surface 14 is 4.9E-01 mm, and the material between surface 13 and surface 14 is air.

[0109] Surfaces 2, 3, 6, 7, 8, 9, 10, and 11 are all even-order aspherical surfaces, and their surface shapes satisfy the following relationship:

[0110]

[0111] Where Z(r) is the distance vector from the vertex of the aspherical surface at a height of r along the optical axis 90°; c is the surface curvature of the aspherical surface, c = 1 / R, where R is the radius of curvature of the aspherical surface; k is the conic coefficient; A, B, C, D... are aspherical coefficients. The values ​​of K, A, B, C, D... for surfaces 2, 3, 6, 7, 8, 9, 10, and 11 can be found in Table 1-3.

[0112] Table 1-3. Coefficients of even-order aspherical surfaces in the visible light optical system 100 provided in Example 1

[0113]

[0114] Please refer to Table 1-3. For surface 2, K is -2.4E+01, A is 6.1E+00, B is -5.7E+01, C is 4.2E+02, D is -1.9E+03, E is 4.5E+03, F is -2.6E+03, G is -1.1E+04, H is 2.0E+04, and I is 1.7E+03. The values ​​of K, A, B, C, D... for surfaces 3, 6, 7, 8, 9, 10, and 11 can be found in Table 1-3 for surface 2, and will not be elaborated here.

[0115] Please see Figure 2 , Figure 2 A phase distribution diagram of the superlens 20 of the visible light optical system 100 provided in Embodiment 1 is shown. Figure 2 The horizontal axis represents the distance from the center of the superlens 20, in millimeters; Figure 2 The vertical axis represents the phase, with units of 1. .Depend on Figure 2 It can be seen that the maximum absolute value of the phase provided by the superlens 20 is... for It is worth mentioning that, Figure 2 The given data is the actual phase distribution of the superlens 20 in Example 1. Since the phase is about... A periodic function, that is, one that has a relation. (n is an integer), therefore, it can be based on the following as needed. Figure 2 Phase of the superlens 20 in Example 1 The remainder is taken to achieve normalization, so as to meet the actual processing needs of the superlens 20.

[0116] Please see Figure 3 , Figure 3 The MTF field-of-view curve of the visible light optical system 100 provided in Embodiment 1 is shown. Figure 3 The horizontal axis in the figure represents the X-axis field of view angle, and its unit is degrees; Figure 3 The vertical axis represents the MTF value. Figure 3 The table lists the sagittal curve S1 and meridional curve T1 of the MTF at a spatial frequency of 50 lp / mm as a function of field of view, and the sagittal curve S2 and meridional curve T2 of the MTF at a spatial frequency of 100 lp / mm as a function of field of view. (From...) Figure 3 It can be seen that within a 0.9 field of view (40.5°), the MTF is greater than 0.5, and within a 1.0 field of view (45°), the MTF is greater than 0.48, indicating that the visible light optical system 100 has excellent imaging quality.

[0117] Please see Figure 4 , Figure 4 The field curve of the visible light optical system 100 provided in Embodiment 1 is shown. Figure 4 The horizontal axis represents the field curvature, and its unit is millimeters; Figure 4 The central vertical axis represents the Y-axis field of view, and its unit is degrees. Figure 4 The diagram shows the sagittal field curve S and meridional field curve T of the visible light optical system 100 under visible light wavelengths of 0.650 μm, 0.610 μm, 0.555 μm, 0.510 μm, and 0.470 μm, respectively. Because some curves are too densely packed, this embodiment does not distinguish the wavelengths corresponding to each curve. Figure 4 It can be seen that the maximum field curvature of the visible light optical system 100 provided in Example 1 is 0.038 mm in the sagittal direction at the above wavelength, and the maximum field curvature of the visible light optical system 100 in the meridional direction at the above wavelength is 0.184 mm. The field curvature is small and meets the requirements for field curvature in the excellent imaging quality standard.

[0118] Please see Figure 5 , Figure 5 The distortion of the visible light optical system 100 provided in Embodiment 1 under visible light wavelengths of 0.650 μm, 0.610 μm, 0.555 μm, 0.510 μm, and 0.470 μm is shown. Since the five curves almost completely overlap, this embodiment does not distinguish the wavelengths corresponding to each curve. Figure 5 It can be seen that the visible light optical system 100 provided in Example 1 has a maximum distortion of 2.66% at the above wavelength, which is relatively small.

[0119] Example 2

[0120] Figure 6 This paper shows a schematic diagram of the architectural layout of the visible light optical system 100 provided in Embodiment 2 of this application. Figure 6The visible light optical system 100, along the optical axis 90 from the object plane 200 to the image plane 300, sequentially includes: an aperture stop 70, a first aspherical lens 10, a superlens 20, a fifth aspherical lens 60, a second aspherical lens 30, a third aspherical lens 40, a fourth aspherical lens 50, and a filter 80. The fifth aspherical lens 60 has a positive optical power, and it is cemented with the superlens 20 to form a cemented lens assembly. Some parameters of the visible light optical system 100 provided in Example 2 are shown in Table 2-1.

[0121] Table 2-1. Partial parameters of the visible light optical system 100 provided in Example 2

[0122]

[0123] As shown in Table 2-1, the total optical length of the visible light optical system 100 is relatively short, only 2.4437 mm. The visible light optical system 100 provided in Example 2 has a relatively small volume and can be installed in various thin and light electronic products. The visible light optical system 100 has an F-number of 2.19, and the light intake of the visible light optical system 100 is relatively large, which can ensure that the image formed is relatively clear and bright. Along the optical axis 90 from the object plane 200 to the image plane 300, starting from the aperture stop 70, each surface in the visible light optical system 100 is numbered, and the parameters of each surface are summarized to obtain Table 2-2 below.

[0124] Table 2-2. Parameters of each surface in the visible light optical system 100 provided in Example 2

[0125]

[0126] The analysis of each surface in Table 2-2 can be referred to Example 1, and will not be repeated in this embodiment.

[0127] Surfaces 2, 3, 6, 7, 8, 9, 10, 11, and 12 are all even-order aspherical surfaces, and their surface shapes satisfy the following relationship:

[0128]

[0129] Where Z(r) is the distance vector from the vertex of the aspherical surface at a height of r along the optical axis 90°; c is the surface curvature of the aspherical surface, c = 1 / R, where R is the radius of curvature of the aspherical surface; k is the conic coefficient; A, B, C, D... are aspherical coefficients. The values ​​of K, A, B, C, D... for surfaces 2, 3, 6, 7, 8, 9, 10, 11, and 12 can be found in Table 2-3.

[0130] Table 2-3. Coefficients of even-order aspherical surfaces in the visible light optical system 100 provided in Example 2

[0131]

[0132] The values ​​of K, A, B, C, D... for surfaces 2, 3, 6, 7, 8, 9, 10, 11 and 12 can be found in Table 2-3, and will not be elaborated here.

[0133] Please see Figure 7 , Figure 7 A phase distribution diagram of the superlens 20 of the visible light optical system 100 provided in Embodiment 2 is shown. Figure 7 The horizontal axis represents the distance from the center of the superlens 20, in millimeters; Figure 7 The vertical axis represents the phase, with units of 1. .Depend on Figure 7 It can be seen that the maximum absolute value of the phase provided by the superlens 20 is... for It is worth mentioning that, Figure 7 The given figure shows the actual phase distribution of the superlens 20 in Example 2. Since the phase is about A periodic function, that is, one that has a relation. (n is an integer), therefore, it can be based on the following as needed. Figure 7 Phase analysis of the superlens 20 in Example 2 The remainder is taken to achieve normalization, so as to meet the actual processing needs of the superlens 20.

[0134] Please see Figure 8 , Figure 8 The MTF field-of-view curve of the visible light optical system 100 provided in Embodiment 2 is shown. Figure 8 The horizontal axis in the figure represents the X-axis field of view angle, and its unit is degrees; Figure 8 The vertical axis represents the MTF value. Figure 8 The table lists the sagittal curve S1 and meridional curve T1 of the MTF at a spatial frequency of 50 lp / mm as a function of field of view, and the sagittal curve S2 and meridional curve T2 of the MTF at a spatial frequency of 100 lp / mm as a function of field of view. (From...) Figure 8 It can be seen that within a 0.9 field of view (46.5°), the MTF is greater than 0.5, and within a 1.0 field of view (46.5°), the MTF is greater than 0.35, indicating that the visible light optical system 100 has excellent imaging quality.

[0135] Please see Figure 9 , Figure 9 The field curve diagram of the visible light optical system 100 provided in Embodiment 2 is shown. Figure 9The horizontal axis represents the field curvature, and its unit is millimeters; Figure 9 The central vertical axis represents the Y-axis field of view, and its unit is degrees. Figure 9 The diagram shows the sagittal field curve S and meridional field curve T of the visible light optical system 100 under visible light wavelengths of 0.650 μm, 0.610 μm, 0.555 μm, 0.510 μm, and 0.470 μm, respectively. Because some curves are too densely packed, this embodiment does not distinguish the wavelengths corresponding to each curve. Figure 9 It can be seen that the maximum field curvature of the visible light optical system 100 at the above wavelength in the sagittal direction is 0.115 mm, and the maximum field curvature of the visible light optical system 100 at the above wavelength in the meridional direction is 0.202 mm. The field curvature is small and meets the requirements for field curvature in the excellent imaging quality standard.

[0136] Please see Figure 10 , Figure 10 The distortion of the visible light optical system 100 provided in Embodiment 2 under visible light wavelengths of 0.650 μm, 0.610 μm, 0.555 μm, 0.510 μm, and 0.470 μm is shown. Since the five curves almost completely overlap, this embodiment does not distinguish the wavelengths corresponding to each curve. Figure 10 It can be seen that the visible light optical system 100 provided in Example 2 has a maximum distortion of 2.05% at the above wavelength, which is relatively small.

[0137] Example 3

[0138] Figure 11 This diagram illustrates the architectural layout of the visible light optical system 100 provided in Embodiment 3 of this application. Figure 11 The visible light optical system 100, along the optical axis 90 from the object plane 200 to the image plane 300, includes, in sequence: an aperture stop 70, a first aspherical lens 10, a superlens 20, a second aspherical lens 30, a third aspherical lens 40, a fourth aspherical lens 50, and a filter 80. Some parameters of the visible light optical system 100 provided in Embodiment 3 are shown in Table 3-1.

[0139] Table 3-1. Partial parameters of the visible light optical system 100 provided in Example 3

[0140]

[0141] As shown in Table 3-1, the total optical length of the visible light optical system 100 is relatively short, only 2.88 mm. The visible light optical system 100 provided in Example 3 has a relatively small volume and can be installed in various thin and light electronic products. The visible light optical system 100 has an F-number of 2.20, and the light intake of the visible light optical system 100 is relatively large, which can ensure that the image formed is relatively clear and bright. Along the optical axis 90 from the object plane 200 to the image plane 300, starting from the aperture stop 70, each surface in the visible light optical system 100 is numbered, and the parameters of each surface are summarized to obtain Table 3-2 below.

[0142] Table 3-2. Parameters of each surface in the visible light optical system 100 provided in Example 3

[0143]

[0144] The analysis of each surface in Table 3-2 can be referred to Example 1, and will not be repeated in this embodiment.

[0145] Surfaces 2, 3, 6, 7, 8, 9, 10, and 11 are all even-order aspherical surfaces, and their surface shapes satisfy the following relationship:

[0146]

[0147] Where Z(r) is the distance vector from the vertex of the aspherical surface at a height of r along the optical axis 90°; c is the surface curvature of the aspherical surface, c = 1 / R, where R is the radius of curvature of the aspherical surface; k is the conic coefficient; A, B, C, D... are aspherical coefficients. The values ​​of K, A, B, C, D... for surfaces 2, 3, 6, 7, 8, 9, 10, and 11 can be found in Table 1-3.

[0148] Table 3-3. Coefficients of even-order aspherical surfaces in the visible light optical system 100 provided in Example 3

[0149]

[0150] The values ​​of K, A, B, C, D... for surfaces 2, 3, 6, 7, 8, 9, 10 and 11 can be found in Table 3-3, and will not be elaborated here.

[0151] Please see Figure 12 , Figure 12 A phase distribution diagram of the superlens 20 of the visible light optical system 100 provided in Embodiment 2 is shown. Figure 12 The horizontal axis represents the distance from the center of the superlens 20, in millimeters; Figure 12 The vertical axis represents the phase, with units of 1. .Depend on Figure 12 It can be seen that the maximum absolute value of the phase provided by the superlens 20 is... for It is worth mentioning that, Figure 12 The given figure shows the actual phase distribution of the superlens 20 in Example 2. Since the phase is about A periodic function, that is, one that has a relation. (n is an integer), therefore, it can be based on the following as needed. Figure 12 Phase analysis of the superlens 20 in Example 2 The remainder is taken to achieve normalization, so as to meet the actual processing needs of the superlens 20.

[0152] Please see Figure 13 , Figure 13 The MTF field-of-view curve of the visible light optical system 100 provided in Embodiment 3 is shown. Figure 13 The horizontal axis in the figure represents the X-axis field of view angle, and its unit is degrees; Figure 13 The vertical axis represents the MTF value. Figure 13 The table lists the sagittal curve S1 and meridional curve T1 of the MTF at a spatial frequency of 50 lp / mm as a function of field of view, and the sagittal curve S2 and meridional curve T2 of the MTF at a spatial frequency of 100 lp / mm as a function of field of view. (From...) Figure 13 It can be seen that within a 0.9 field of view (40.5°), the MTF is greater than 0.52, and within a 1.0 field of view (45°), the MTF is greater than 0.5, indicating that the visible light optical system 100 has excellent imaging quality.

[0153] Please see Figure 14 , Figure 14 The field curve of the visible light optical system 100 provided in Embodiment 3 is shown. Figure 14 The horizontal axis represents the field curvature, and its unit is millimeters; Figure 14 The central vertical axis represents the Y-axis field of view, and its unit is degrees. Figure 14 The diagram shows the sagittal field curve S and meridional field curve T of the visible light optical system 100 under visible light wavelengths of 0.650 μm, 0.610 μm, 0.555 μm, 0.510 μm, and 0.470 μm, respectively. Because some curves are too densely packed, this embodiment does not distinguish the wavelengths corresponding to each curve. Figure 14 It can be seen that the maximum field curvature of the visible light optical system 100 provided in Example 3 in the sagittal direction at the above wavelength is 0.088 mm, and the maximum field curvature of the visible light optical system 100 in the meridional direction at the above wavelength is 0.305 mm. The field curvature is small and meets the requirements for field curvature in the excellent imaging quality standard.

[0154] Please see Figure 15 , Figure 15The distortion of the visible light optical system 100 provided in Example 3 under visible light wavelengths of 0.650 μm, 0.610 μm, 0.555 μm, 0.510 μm, and 0.470 μm is shown. Since the five curves almost completely overlap, this embodiment does not distinguish the wavelengths corresponding to each curve. Figure 15 It can be seen that the visible light optical system 100 provided in Example 3 has a maximum distortion of 2.57% at the above wavelength, which is relatively small.

[0155] Example 4

[0156] Figure 16 This paper shows a schematic diagram of the architectural layout of the visible light optical system 100 provided in Embodiment 4 of this application. Figure 16 The visible light optical system 100, along the optical axis 90 from the object plane 200 to the image plane 300, sequentially includes: an aperture stop 70, a first aspherical lens 10, a superlens 20, a fifth aspherical lens 60, a second aspherical lens 30, a third aspherical lens 40, a fourth aspherical lens 50, and a filter 80. The fifth aspherical lens 60 has a negative optical power, and it is cemented with the superlens 20 to form a cemented lens assembly. Some parameters of the visible light optical system 100 provided in Example 4 are shown in Table 4-1.

[0157] Table 4-1. Partial parameters of the visible light optical system 100 provided in Example 4

[0158]

[0159] As shown in Table 4-1, the total optical length of the visible light optical system 100 is relatively short, only 2.4678 mm. The visible light optical system 100 provided in Example 4 has a relatively small volume and can be installed in various thin and light electronic products. The visible light optical system 100 has an F-number of 2.19, and its light intake is relatively large, ensuring that the image formed is relatively clear and bright. Along the optical axis 90 from the object plane 200 to the image plane 300, starting from the aperture stop 70, each surface in the visible light optical system 100 is numbered, and the parameters of each surface are summarized to obtain Table 4-2 below.

[0160] Table 4-2. Parameters of each surface in the visible light optical system 100 provided in Example 4

[0161]

[0162] The analysis of each surface in Table 4-2 can be referred to Example 1, and will not be repeated in this embodiment.

[0163] Surfaces 2, 3, 6, 7, 8, 9, 10, 11, and 12 are all even-order aspherical surfaces, and their surface shapes satisfy the following relationship:

[0164]

[0165] Where Z(r) is the distance vector from the vertex of the aspherical surface at a height of r along the optical axis 90°; c is the surface curvature of the aspherical surface, c = 1 / R, where R is the radius of curvature of the aspherical surface; k is the conic coefficient; A, B, C, D... are aspherical coefficients. The values ​​of K, A, B, C, D... for surfaces 2, 3, 6, 7, 8, 9, 10, 11, and 12 can be found in Table 2-3.

[0166] Table 4-3. Coefficients of even-order aspherical surfaces in the visible light optical system 100 provided in Example 4

[0167]

[0168] The values ​​of K, A, B, C, D... for surfaces 2, 3, 6, 7, 8, 9, 10, 11 and 12 can be found in Table 4-3, and will not be elaborated here.

[0169] Please see Figure 17 , Figure 17 A phase distribution diagram of the superlens 20 of the visible light optical system 100 provided in Embodiment 4 is shown. Figure 17 The horizontal axis represents the distance from the center of the superlens 20, in millimeters; Figure 17 The vertical axis represents the phase, with units of 1. .Depend on Figure 17 It can be seen that the maximum absolute value of the phase provided by the superlens 20 is... for It is worth mentioning that, Figure 17 The given data is the actual phase distribution of the superlens 20 in Example 4. Since the phase is about... A periodic function, that is, one that has a relation. (n is an integer), therefore, it can be based on the following as needed. Figure 17 Phase analysis of the superlens 20 in Example 4 The remainder is taken to achieve normalization, so as to meet the actual processing needs of the superlens 20.

[0170] Please see Figure 18 , Figure 18 The MTF field-of-view curve of the visible light optical system 100 provided in Embodiment 4 is shown. Figure 18 The horizontal axis in the figure represents the X-axis field of view angle, and its unit is degrees; Figure 18 The vertical axis represents the MTF value. Figure 18 The table lists the sagittal curve S1 and meridional curve T1 of the MTF at a spatial frequency of 50 lp / mm as a function of field of view, and the sagittal curve S2 and meridional curve T2 of the MTF at a spatial frequency of 100 lp / mm as a function of field of view. (From...) Figure 18 It can be seen that within a 0.9 field of view (40.5°), the MTF is greater than 0.52, and within a 1.0 field of view (45°), the MTF is greater than 0.39, indicating that the visible light optical system 100 has excellent imaging quality.

[0171] Please see Figure 19 , Figure 19 The field curve diagram of the visible light optical system 100 provided in Embodiment 4 is shown. Figure 19 The horizontal axis represents the field curvature, and its unit is millimeters; Figure 19 The central vertical axis represents the Y-axis field of view, and its unit is degrees. Figure 19 The diagram shows the sagittal field curve S and meridional field curve T of the visible light optical system 100 under visible light wavelengths of 0.650 μm, 0.610 μm, 0.555 μm, 0.510 μm, and 0.470 μm, respectively. Because some curves are too densely packed, this embodiment does not distinguish the wavelengths corresponding to each curve. Figure 19 It can be seen that the maximum field curvature of the visible light optical system 100 provided in Example 4 in the sagittal direction at the above wavelength is 0.064 mm, and the maximum field curvature of the visible light optical system 100 in the meridional direction at the above wavelength is 0.108 mm. The field curvature is small and meets the requirements for field curvature in the excellent imaging quality standard.

[0172] Please see Figure 20 , Figure 20 The distortion of the visible light optical system 100 provided in Example 4 under visible light wavelengths of 0.650 μm, 0.610 μm, 0.555 μm, 0.510 μm, and 0.470 μm is shown. Since the five curves almost completely overlap, this embodiment does not distinguish the wavelengths corresponding to each curve. Figure 20 It can be seen that the visible light optical system 100 provided in Example 4 has a maximum distortion of 2.99% at the above wavelength, which is relatively small.

[0173] Example 5

[0174] Figure 21 This paper shows a schematic diagram of the architectural layout of the visible light optical system 100 provided in Embodiment 5 of this application. Figure 21The visible light optical system 100, along the optical axis 90 from the object plane 200 to the image plane 300, includes, in sequence: a first aspherical lens 10, an aperture stop 70, a superlens 20, a second aspherical lens 30, a third aspherical lens 40, a fourth aspherical lens 50, and a filter 80. Some parameters of the visible light optical system 100 provided in Embodiment 5 are shown in Table 5-1.

[0175] Table 5-1. Partial parameters of the visible light optical system 100 provided in Example 5

[0176]

[0177] As shown in Table 5-1, the total optical length of the visible light optical system 100 is relatively short, only 3.05 mm. The visible light optical system 100 provided in Example 5 has a relatively small volume and can be installed in various thin and light electronic products. The visible light optical system 100 has an F-number of 2.18, and the light intake of the visible light optical system 100 is relatively large, which can ensure that the image formed is relatively clear and bright. Along the optical axis 90 from the object plane 200 to the image plane 300, starting from the aperture stop 70, each surface in the visible light optical system 100 is numbered, and the parameters of each surface are summarized to obtain Table 5-2 below.

[0178] Table 5-2. Parameters of each surface in the visible light optical system 100 provided in Example 5

[0179]

[0180] The analysis of each surface in Table 5-2 can be referred to Example 1, and will not be repeated in this embodiment.

[0181] Surfaces 1, 2, 6, 7, 8, 9, 10, and 11 are all even-order aspherical surfaces, and their surface shapes satisfy the following relationship:

[0182]

[0183] Where Z(r) is the distance vector from the vertex of the aspherical surface at a height of r along the optical axis 90°; c is the surface curvature of the aspherical surface, c = 1 / R, where R is the radius of curvature of the aspherical surface; k is the conic coefficient; A, B, C, D... are aspherical coefficients. The values ​​of K, A, B, C, D... for surfaces 1, 2, 6, 7, 8, 9, 10, and 11 can be found in Table 5-3.

[0184] Table 5-3. Coefficients of even-order aspherical surfaces in the visible light optical system 100 provided in Example 5

[0185]

[0186] The values ​​of K, A, B, C, D... for surfaces 1, 2, 6, 7, 8, 9, 10 and 11 can be found in Table 5-3, and will not be elaborated here.

[0187] Please see Figure 22 , Figure 22 A phase distribution diagram of the superlens 20 of the visible light optical system 100 provided in Embodiment 5 is shown. Figure 22 The horizontal axis represents the distance from the center of the superlens 20, in millimeters; Figure 22 The vertical axis represents the phase, with units of 1. .Depend on Figure 22 It can be seen that the maximum absolute value of the phase provided by the superlens 20 is... for It is worth mentioning that, Figure 22 The given data is the actual phase distribution of the superlens 20 in Example 5. Since the phase is about... A periodic function, that is, one that has a relation. (n is an integer), therefore, it can be based on the following as needed. Figure 22 Phase analysis of the superlens 20 in Example 5 The remainder is taken to achieve normalization, so as to meet the actual processing needs of the superlens 20.

[0188] Please see Figure 23 , Figure 23 The MTF field-of-view curve of the visible light optical system 100 provided in Embodiment 5 is shown. Figure 23 The horizontal axis in the figure represents the X-axis field of view angle, and its unit is degrees; Figure 23 The vertical axis represents the MTF value. Figure 23 The table lists the sagittal curve S1 and meridional curve T1 of the MTF at a spatial frequency of 50 lp / mm as a function of field of view, and the sagittal curve S2 and meridional curve T2 of the MTF at a spatial frequency of 100 lp / mm as a function of field of view. (From...) Figure 23 It can be seen that within a 0.9 field of view (40.5°), the MTF is greater than 0.48, and within a 1.0 field of view (45°), the MTF is greater than 0.42, indicating that the visible light optical system 100 has excellent imaging quality.

[0189] Please see Figure 24 , Figure 24 The field curve of the visible light optical system 100 provided in Embodiment 5 is shown. Figure 24 The horizontal axis represents the field curvature, and its unit is millimeters; Figure 24 The central vertical axis represents the Y-axis field of view, and its unit is degrees. Figure 24The diagram shows the sagittal field curve S and meridional field curve T of the visible light optical system 100 under visible light wavelengths of 0.650 μm, 0.610 μm, 0.555 μm, 0.510 μm, and 0.470 μm, respectively. Because some curves are too densely packed, this embodiment does not distinguish the wavelengths corresponding to each curve. Figure 24 It can be seen that the maximum field curvature of the visible light optical system 100 provided in Example 5 in the sagittal direction at the above wavelength is 0.056 mm, and the maximum field curvature of the visible light optical system 100 in the meridional direction at the above wavelength is 0.290 mm. The field curvature is small and meets the requirements for field curvature in the excellent imaging quality standard.

[0190] Please see Figure 25 , Figure 25 The distortion of the visible light optical system 100 provided in Embodiment 5 under visible light wavelengths of 0.650 μm, 0.610 μm, 0.555 μm, 0.510 μm, and 0.470 μm is shown. Since the five curves almost completely overlap, this embodiment does not distinguish the wavelengths corresponding to each curve. Figure 25 It can be seen that the visible light optical system 100 provided in Example 5 has a maximum distortion of 2.72% at the above wavelength, which is relatively small.

[0191] After summarizing the parameters of the visible light optical system 100 provided in the above five embodiments, Table 6 is obtained as shown below. The table 6 is mainly used to illustrate that the visible light optical system 100 provided in this application meets the various conditions, all of which have been experimentally verified and supported.

[0192] Table 6. Parameters of the Visible Light Optical System 100 provided in each embodiment

[0193]

[0194]

[0195] This application also provides a visible light optical lens (not shown in the figure), and a visible light optical system 100 including an image sensor and the aforementioned visible light optical system 100. The architecture of the visible light optical system 100 can be found above and will not be repeated here. The image sensor is located on the image plane 300 of the visible light optical system 100, and the image sensor includes, but is not limited to, CMOS (Complementary Metal Oxide Semiconductor) and CCD (Charge Coupled Device).

[0196] Since the visible light optical system 100 provided in this application has a relatively small size and excellent image quality, the visible light optical lens provided in this application also has a small size and excellent imaging quality. Therefore, the visible light optical lens can be widely used in various electronic products, including but not limited to mobile phones, computers, tablets and other relatively thin and light electronic products.

[0197] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the appended claims.

Claims

1. A visible light optical system, characterized in that, The visible light optical system includes: a superlens, a first aspherical lens, a second aspherical lens, a third aspherical lens, and a fourth aspherical lens, wherein the first aspherical lens, the second aspherical lens, the third aspherical lens, and the fourth aspherical lens are arranged sequentially from the object side to the image side along the optical axis; The optical power of the superlens is positive; the optical power of the first aspherical lens is positive, the object-side surface of the first aspherical lens is convex towards the object side, and the image-side surface of the first aspherical lens is convex towards the object side; the optical power of the second aspherical lens is negative, the object-side surface of the second aspherical lens is convex towards the image side, and the image-side surface of the second aspherical lens is convex towards the image side; the optical power of the third aspherical lens is positive, the object-side surface of the third aspherical lens is convex towards the image side, and the image-side surface of the third aspherical lens is convex towards the image side; the optical power of the fourth aspherical lens is negative.

2. The visible light optical system according to claim 1, characterized in that, The first aspherical lens, the superlens, the second aspherical lens, the third aspherical lens, and the fourth aspherical lens are arranged sequentially along the optical axis from the object side to the image side; the visible light optical system satisfies: ,in, The effective focal length of the visible light optical system is... The entrance pupil diameter of the visible light optical system is given.

3. The visible light optical system according to claim 1, characterized in that, The visible light optical system satisfies: ,in, The total optical length of the visible light optical system is given. This is the maximum full field of view of the visible light optical system; This is the optical back focal length of the visible light optical system. The effective focal length of the visible light optical system is given.

4. The visible light optical system according to claim 1, characterized in that, The visible light optical system satisfies: ,in, The incident angle of the principal ray of the visible light optical system is [angle of incidence]. The length of the diagonal of the imaging area of ​​the visible light optical system on the image plane is half of the length of the image. The total optical length of the visible light optical system is given.

5. The visible light optical system according to claim 1, characterized in that, The visible light optical system satisfies: ,in, Let be the radius of curvature of the object-side surface of the fourth aspherical lens. Let be the radius of curvature of the image-side surface of the fourth aspherical lens. The focal length of the fourth aspherical lens is... The effective focal length of the visible light optical system is given.

6. The visible light optical system according to claim 1, characterized in that, The visible light optical system satisfies: , Let be the focal length of the first aspherical lens. Let be the focal length of the second aspherical lens. The focal length of the third aspherical lens is... The focal length of the fourth aspherical lens is... Let be the focal length of the superlens.

7. The visible light optical system according to claim 1, characterized in that, The superlens satisfies: ,in, The difference between the maximum and minimum optical power of the superlens in the operating wavelength band. It is the unit of diopter.

8. The visible light optical system according to claim 1, characterized in that, The visible light optical system satisfies: ,in, The effective focal length of the visible light optical system is... The maximum absolute value of the phase provided by the superlens. The radius of the maximum effective area of ​​the superlens. Let be the focal length of the superlens.

9. The visible light optical system according to claim 1, characterized in that, The visible light optical system further includes a fifth aspherical lens, which is cemented to the image side of the superlens, and the image side of the fifth aspherical lens convexes toward the object side.

10. A visible light optical lens, characterized in that, The visible light optical lens includes: an image sensor and a visible light optical system as described in any one of claims 1-9; the image sensor is disposed on the image plane of the visible light optical system.

Images