Optical lens

Abstract

Embodiments of the present application provide an optical lens, comprising: a first lens group with positive refractive power; a reflective element; a second lens group with positive refractive power; and a third lens group with positive refractive power; wherein the reflective element is arranged between the light exit side of the first lens group and the light entrance side of the second lens group, the light rays emitted by the first lens group enter the second lens group along a first direction and form an image on a first image plane via the reflective element, and enter the third lens group along a second direction and form an image on a second image plane; the first lens group and the second lens group form an optical imaging group; and the first lens group and the third lens group form an optical distance measuring group. The optical lens provided by the present application can balance the large aperture and infrared confocal characteristics, and can clearly image in a dim environment at night.

Description

Technical Field

[0001] This application relates to the field of optical components, and more specifically, to an optical lens. Background Technology

[0002] With the development of modern society and the advancement of science and technology, optical systems have been widely used in all aspects of life.

[0003] In the fields of security, industry, and robotics, the increasing demand for infrared night vision is placing ever higher requirements on these optical lenses. For example, to meet the needs of clear identification and positioning, optical lenses are required to have high resolution; to meet the needs of portability and reduce weight and size, optical lenses are required to meet miniaturization design; to meet the needs of observing object details, optical lenses are required to have a long focal length; and to meet the needs of nighttime observation, optical lenses are required to meet the needs of large aperture and infrared confocal performance.

[0004] In summary, current optical lenses struggle to balance high resolution, large aperture, and infrared confocal characteristics, failing to meet the ever-increasing demands of users. Summary of the Invention

[0005] The technical solution provided in this application at least partially solves the above-mentioned technical problems.

[0006] An optical lens is provided according to an embodiment of this application, comprising: a first lens group having positive optical power; a reflective element; a second lens group having positive optical power; and a third lens group having positive optical power; wherein the reflective element is disposed between the light-emitting side of the first lens group and the light-incident side of the second lens group, and light rays emitted from the first lens group are incident on the second lens group along a first direction and imaged on a first image plane, and incident on the third lens group along a second direction and imaged on a second image plane; the first lens group and the second lens group form an optical imaging group; the first lens group and the third lens group form an optical ranging group.

[0007] In some embodiments, the second lens group includes two positive lenses, wherein the object-side and image-side surfaces of the first positive lens are both convex, and the object-side surface of the second positive lens is convex and the image-side surface is concave.

[0008] In some embodiments, the third lens group includes two positive lenses, the first positive lens having a convex image-side surface, and the second positive lens having a convex image-side surface.

[0009] In some embodiments, the first lens group includes: a first lens with positive optical power and a convex object-side surface; a second lens with positive optical power and a convex object-side surface; a third lens with negative optical power and a concave image-side surface; an aperture; a fourth lens with negative optical power and both its object-side and image-side surfaces are concave; a fifth lens with positive optical power and both its object-side and image-side surfaces are convex; a sixth lens with negative optical power and both its object-side and image-side surfaces are concave; a seventh lens with negative optical power and a concave image-side surface; and an eighth lens with positive optical power and both its object-side and image-side surfaces are convex.

[0010] In some embodiments, the focal length F1 of the first lens and the total focal length FⅠ of the optical imaging group satisfy: 0.95≤F1 / FⅠ≤1.45.

[0011] In some implementations, the combined focal length F23 of the second and third lenses satisfies the following condition with respect to the total focal length FI of the optical imaging group: -1.85 ≤ F23 / FI ≤ -1.35.

[0012] In some implementations, the combined focal length F456 of the fourth, fifth, and sixth lenses satisfies the following condition with respect to the total focal length FI of the optical imaging group: -0.65 ≤ F456 / FI ≤ -0.30.

[0013] In some implementations, the combined focal length F78 of the seventh and eighth lenses satisfies the following condition with respect to the total focal length FI of the optical imaging group: 0.60 ≤ F78 / FI ≤ 1.20.

[0014] In some embodiments, the combined focal length F13 of the first, second, and third lenses and the combined focal length F48 of the fourth, fifth, sixth, seventh, and eighth lenses satisfy the condition: -1.20 ≤ F13 / F48 ≤ -0.90.

[0015] In some implementations, the focal length FG1 of the first lens group and the total focal length FI of the optical imaging group satisfy: 6.95≤FG1 / FI≤8.65.

[0016] In some embodiments, the focal length F9a of the first positive lens of the second lens group satisfies the following condition with the total focal length FI of the optical imaging group: 1.00≤F9a / FI≤1.30.

[0017] In some embodiments, the focal length F10a of the second positive lens of the second lens group satisfies the following condition with the total focal length FI of the optical imaging group: 1.65≤F10a / FI≤2.90.

[0018] In some implementations, the focal length FG2 of the second lens group and the total focal length FI of the optical imaging group satisfy: 0.60≤FG2 / FI≤0.80.

[0019] In some implementations, the focal length F9b of the first positive lens of the third lens group satisfies the following condition with the total focal length FII of the optical rangefinder group: 1.05 ≤ F9b / FII ≤ 1.85.

[0020] In some embodiments, the focal length F10b of the second positive lens of the third lens group satisfies the following condition with the total focal length FII of the optical rangefinder group: 0.45≤F10b / FII≤1.30.

[0021] In some implementations, the focal length FG3 of the third lens group and the total focal length FII of the optical rangefinder group satisfy the following condition: 0.50≤FG3 / FII≤0.75.

[0022] In some embodiments, the center distance BFL1 from the image side of the last lens in the second lens group to the first image plane and the center distance TTL1 from the object side of the first lens in the first lens group to the first image plane satisfy the following condition: 0.10≤BFL1 / TTL1≤0.25.

[0023] In some implementations, the center distance BFL2 from the image side of the last lens in the third lens group to the second image plane satisfies the condition that 0.05 ≤ BFL2 / TTL2 ≤ 0.30 with respect to the object side of the first lens in the first lens group to the center distance TTL2 from the object side of the first lens in the first lens group to the second image plane.

[0024] In some embodiments, the thickness T of the reflecting element and the center distance TTL1 from the object side of the first lens in the first lens group to the first image plane satisfy the following condition: 0.20≤T / TTL1≤0.35.

[0025] In some embodiments, the distance T1 from the center of the image side of the last lens in the first lens group to the center of the reflecting element, the distance T2 from the center of the reflecting element to the center of the object side of the first lens in the second lens group, and the distance TTL1 from the object side of the first lens in the first lens group to the center of the first image plane satisfy: 0.05≤(T1+T2) / TTL1≤0.15.

[0026] In some embodiments, the distance T3 from the center of the reflecting element to the center of the object side surface of the first lens in the third lens group and the distance TTL2 from the object side surface of the first lens in the first lens group to the center of the second image plane satisfy: 0.04≤T3 / TTL2≤0.09.

[0027] In some embodiments, the refractive index Nd9a and Abbe number Vd9a of the first positive lens in the second lens group satisfy: Nd9a≥1.7; Vd9a≤50.

[0028] In some implementations, the refractive index Nd9b and Abbe number Vd9b of the first positive lens in the third lens group satisfy: Nd9b≥1.7; Vd9b≤50.

[0029] In some implementations, the refractive index Nd1 of the first lens satisfies: 1.7≤Nd1≤2.1.

[0030] In some implementations, the Abbe number Vd5 of the fifth lens satisfies: 65 ≤ Vd5 ≤ 100.

[0031] In some implementations, the refractive index Vd8 of the eighth lens satisfies: 65 ≤ Vd8 ≤ 100.

[0032] In some embodiments, the optical lens also includes a detector for measuring the object distance based on the energy collected by the optical ranging group.

[0033] The optical lens provided according to the embodiments of this application includes a first lens group, a reflective element, a second lens group, and a third lens group, wherein the first lens group and the second lens group form an optical imaging group, and the first lens group and the third lens group form an optical ranging group. Through the optical power of each lens group and the optical power and surface design of each lens in the lens group, the optical lens has a large aperture characteristic, achieving an aperture number (FNO) of approximately 1.2; furthermore, the optical lens provided in this application meets the characteristic of infrared confocal imaging, enabling clear imaging in low-light environments at night. Attached Figure Description

[0034] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0035] Figure 1 A schematic diagram of the structure of an optical lens according to Embodiment 1 of this application is shown;

[0036] Figure 2 A schematic diagram of the structure of an optical lens according to Embodiment 2 of this application is shown;

[0037] Figure 3 A schematic diagram of the structure of an optical lens according to Embodiment 3 of this application is shown; and

[0038] Figure 4 A schematic diagram of the structure of an optical lens according to Embodiment 4 of this application is shown. Detailed Implementation

[0039] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0040] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the first lens.

[0041] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0042] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0043] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0044] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other. The following embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application.

[0046] The features, principles and other aspects of this application are described in detail below.

[0047] refer to Figure 1 As shown, according to an embodiment of this application, an optical lens is provided, including a first lens group G1, a reflective element, a second lens group G2, and a third lens group G3.

[0048] According to an exemplary embodiment of the optical lens of this application, a reflective element is disposed between the light-emitting side of the first lens group G1 and the light-incident side of the second lens group G2. Light rays emitted from the first lens group G1 are incident on the second lens group G2 along a first direction and imaged on the first image plane IMA1, and incident on the third lens group G3 along a second direction and imaged on the second image plane IMA2. The reflective element may be, for example, a reflecting prism. The first direction may be, for example, the direction in which the light rays exit through the first lens group G1; the second direction has a certain deflection angle relative to the first direction.

[0049] Among them, the first lens group G1, as the front lens group of the optical lens, can have positive optical power, which is beneficial for correcting various aberrations in the optical system and balancing chromatic aberration, and thus improving image quality.

[0050] The second lens group G2 and the first lens group G1 form an optical imaging group, which can have positive optical power, effectively correct residual chromatic aberration of the system, and improve resolution.

[0051] The third lens group G3 and the first lens group G1 form an optical ranging group, which can have positive optical power, which is conducive to the rapid transition of light to the imaging surface and minimizes the overall length of the system.

[0052] According to the optical lens of the above exemplary embodiment, when the light emitted from the front lens group reaches the reflecting surface of the reflecting element (e.g., a prism), part of it is transmitted into the second lens group G2, and the other part is reflected into the third lens group G3, thereby splitting the light into two paths. The transmitted light path (the light path through the second lens group G2) can be used for imaging, while the reflected light path (the light path through the third lens group G3) can be used to collect energy for measuring object distance.

[0053] In some embodiments, the optical ranging assembly may also include a detector that measures the object distance based on the energy collected by the reflected light path. For example, the detector converts the received light signal into an electrical signal, and performs data processing and calculations on the electrical signal to obtain relevant information such as the distance to the target object within the detection range. The optical lens may also include other ranging components, such as a laser emitter.

[0054] In some implementations, the optical ranging group can also determine relevant information such as the distance to the target object based on the obtained optical imaging information. For example, when the optical path through the third lens group G3 reaches the optimal focusing state, the distance to the target object can be calculated by measuring the image distance and using the lens imaging formula.

[0055] In an exemplary embodiment, the first lens group G1 includes at least four negative lenses and at least four positive lenses; the second lens group G2 includes at least two positive lenses; and the third lens group G3 includes at least two positive lenses.

[0056] In some embodiments, the first lens group G1 comprises a total of eight lenses with optical power, which are sequentially arranged from the object side to the image side along the first optical axis of the first lens group G1: a first lens L1 with positive optical power, whose object side is convex; a second lens L2 with positive optical power, whose object side is convex; a third lens L3 with negative optical power, whose image side is concave; a fourth lens L4 with negative optical power, whose object side and image side are both concave; a fifth lens L5 with positive optical power, whose object side and image side are both convex; a sixth lens L6 with negative optical power, whose object side and image side are both concave; a seventh lens L7 with negative optical power, whose image side is concave; and an eighth lens L8 with positive optical power, whose object side and image side are both convex.

[0057] In the above embodiment, the first lens group G1 may further include an aperture stop STO, which may be located between the third lens L3 and the fourth lens L4. The aperture stop being located between the third lens L3 and the fourth lens L4 facilitates a better transition of light between the two lenses, allowing the light to smoothly transition to the rear end of the first lens group G1, reducing the aperture of the rear lens, and lowering the system's assembly sensitivity.

[0058] According to the optical lens of the above embodiment, the first lens L1 has positive optical power and bears the main positive optical power of the system. Its object side is convex. By collecting light, the light emitted through it maintains a downward trend, thereby reducing the aperture size of the rear lens. This is beneficial for reducing chromatic aberration, miniaturizing the lens, and reducing costs.

[0059] According to the optical lens of the above embodiment, the second lens L2 has positive optical power, the object side is convex, and its image side is also convex, which helps to reduce the generation of aberrations; the image side is also concave, which can reduce the incident angle of on-axis rays on the image side of the second lens L2, reduce the spherical aberration generated on the image side of the second lens L2, and help to achieve high image quality.

[0060] According to the optical lens of the above embodiment, the third lens L3 has negative optical power and its image-side surface is concave. The third lens L3 and the second lens L2 can correct the chromatic aberration generated by the first lens L1. In some embodiments, the third lens L3 can also be combined with the second lens L2 as a cemented lens, thereby generating a larger negative spherical aberration, better compensating for the positive spherical aberration generated by the first lens L1, reducing the difficulty of system aberration correction, and facilitating the achievement of high image quality.

[0061] According to the optical lens of the above embodiment, the fourth lens L4 has negative optical power, and both the object-side and image-side surfaces are concave. The fourth lens L4 collects the light rays that have passed through the first three lenses, making the light path transition smoothly. Its object-side surface is designed to be concave, which can diverge the light rays transmitted from the first three lenses, so that the light rays at the edge of the field of view have an upward trend, thereby obtaining a larger image.

[0062] According to the optical lens of the above embodiment, the fifth lens L5 has positive optical power, and the object side and the image side are convex. It can effectively converge light rays, so that the light rays enter the rear lens smoothly, which is beneficial to reduce the generation of aberrations and improve the resolution.

[0063] According to the optical lens of the above embodiment, the sixth lens L6 has negative optical power, and the object side is concave and the image side is concave, which helps to reduce the generation of aberrations and improve resolution.

[0064] In some exemplary embodiments, the fourth lens L4, the fifth lens L5, and the sixth lens L6 can form a cemented lens, which is beneficial for correcting system chromatic aberration. The fourth lens L4 has negative optical power in the cemented lens, and its combination with the fifth lens L5 and the sixth lens L6 to correct system chromatic aberration contributes to achieving high image quality. The fifth lens L5 has positive optical power in the cemented lens, and by using a high Abbe number material, it is beneficial for correcting system chromatic aberration and achieving infrared confocal focusing. The sixth lens L6 has negative optical power in the cemented lens, which can compensate for the on-axis chromatic aberration generated by the first lens L1, thus contributing to infrared confocal focusing.

[0065] According to the optical lens of the above embodiment, the seventh lens L7 has negative optical power and its image side is concave, which helps to reduce the generation of aberrations and improve resolution.

[0066] According to the optical lens of the above embodiment, the eighth lens L8 has positive optical power, and the object side is convex and the image side is convex, which is conducive to light convergence. The image side of the eighth lens L8 is convex and the lens shape is flat, which allows the diverging light to enter smoothly into the rear, and further makes the light path transition smoothly.

[0067] In some exemplary embodiments, the seventh lens L7 and the eighth lens L8 constitute a cemented lens.

[0068] By using the above-mentioned method of assembling cemented lenses (L4-L6, L7-L8), it is beneficial to correct chromatic aberration and reduce the difference in light angle between the reflective surfaces of reflective elements (such as prisms). This results in a smaller light angle, reduces the difficulty of coating, and minimizes the energy differences between the reflected and transmitted light paths. This allows the reflected light path to collect higher and more concentrated energy, eliminating color deviation in the transmitted light path.

[0069] According to an exemplary embodiment of the optical lens of this application, the second lens group G2 includes two lenses with positive optical power: a first positive lens L9a and a second positive lens L10a. By selecting two lenses with positive optical power, residual chromatic aberration of the system can be effectively corrected, and resolution can be improved.

[0070] In some embodiments, the first positive lens L9a in the second lens group G2 may have positive optical power, with both the object-side and image-side surfaces being convex. This facilitates a reduction in the height of light rays entering the subsequent second positive lens L10a, thereby reducing the sensitivity of the second positive lens L10a. Simultaneously, the use of the second positive lens L10a with positive optical power allows light rays to converge onto the imaging plane (first image plane IMA1), reducing the overall system length. Furthermore, the positive spherical aberration generated by the object-side surface of the first positive lens L9a can compensate for the negative spherical aberration generated by the first lens group G1, thus improving image quality.

[0071] The second positive lens L10a in the second lens group G2 has positive optical power, a convex object-side surface, and a concave image-side surface, which facilitates the smooth entry of light rays into the imaging plane (first image plane IMA1) and helps correct astigmatism and field curvature generated by the system. In addition, the first positive lens L9a and the second positive lens L10a in the second lens group G2 also help correct chromatic aberration generated by the reflecting element and residual chromatic aberration in the system.

[0072] According to the optical lens of the exemplary embodiment of this application, the third lens group G3 includes two lenses with positive optical power: a first positive lens L9b and a second positive lens L10b. By selecting two lenses with positive optical power, it is beneficial for light to quickly transition to the imaging plane (the second imaging plane IMA2), minimizing the overall system length; at the same time, it is beneficial to improve energy harvesting efficiency, thereby improving ranging accuracy (ranging accuracy is related to the intensity of energy collected by the detector).

[0073] In some embodiments, the first positive lens L9b in the third lens group G3 may have positive optical power and a convex image-side surface, which facilitates the smooth transition of light rays to the rear imaging system. The second positive lens L10b in the third lens group G3 may also have positive optical power and a convex image-side surface, which facilitates the smooth transition of light rays to the imaging surface. Together with the first positive lens L9b with positive optical power, the use of two positive lenses can quickly converge light rays and smoothly transition them to the imaging surface (second imaging surface IMA2), thereby effectively shortening the overall length and reducing costs.

[0074] In an exemplary embodiment, the optical lens can satisfy the following condition: 0.95 ≤ F1 / FⅠ ≤ 1.45, where F1 is the focal length of the first lens and FⅠ is the total focal length of the optical imaging group. Satisfying this condition is beneficial for controlling the focal length of the first lens, and since the first lens is a positive power lens, the optical power can be effectively and reasonably allocated to meet the design requirements of the telephoto system.

[0075] In an exemplary embodiment, the optical lens may satisfy the following condition: -1.85≤F23 / FI≤-1.35, where F23 is the combined focal length of the second and third lenses, and FI is the total focal length of the optical imaging group. Satisfying this condition helps the light to have a larger refraction angle at the second and third lenses, reducing the height of the light on the lens and thus achieving the function of reducing the aperture of the rear lens.

[0076] In an exemplary embodiment, the optical lens can satisfy the following condition: -0.65≤F456 / FI≤-0.30, where F456 is the combined focal length of the fourth, fifth, and sixth lenses, and FI is the total focal length of the optical imaging group. Satisfying this condition can effectively control the light path entering the cemented lens, reduce aberrations caused by large-angle light rays entering through the first lens, and simultaneously make the lens structure compact, which is beneficial for lens miniaturization.

[0077] In an exemplary embodiment, the optical lens may satisfy the following condition: 0.60≤F78 / FI≤1.20, where F78 is the combined focal length of the seventh and eighth lenses, and FI is the total focal length of the optical imaging group. Satisfying this condition is beneficial for maximizing the difference in optical path between the center and periphery of the cemented lens's positive and negative elements, which helps balance the accumulated aberrations in the front-end system and improves resolution.

[0078] In an exemplary embodiment, the optical lens can satisfy the following condition: -1.20≤F13 / F48≤-0.90, where F13 is the combined focal length of the first, second, and third lenses, and F48 is the combined focal length of the fourth, fifth, sixth, seventh, and eighth lenses. Satisfying this condition allows control over the light path between the first three lenses and the last five lenses, reducing aberrations caused by large-angle light refraction, and making the lenses more compact, which is beneficial for lens miniaturization.

[0079] In an exemplary embodiment, the optical lens may satisfy the following condition: 6.95 ≤ FG1 / FI ≤ 8.65, where FG1 is the focal length of the first lens group and FI is the total focal length of the optical imaging group. Satisfying this condition helps improve the optical power of the first lens group, reduces the sensitivity of the first lens group, and can improve the performance yield of the lens.

[0080] In an exemplary embodiment, the optical lens can satisfy the following condition: 1.00≤F9a / FI≤1.30, where F9a is the focal length of the first positive lens in the second lens group, and FI is the total focal length of the optical imaging group. Satisfying this condition and reasonably controlling the focal length of the first positive lens in the second lens group is beneficial for correcting residual chromatic aberration in the system and improving resolution.

[0081] In an exemplary embodiment, the optical lens can satisfy the following condition: 1.65≤F10a / FI≤2.90, where F10a is the focal length of the second positive lens in the second lens group, and FI is the total focal length of the optical imaging group. Satisfying this condition and reasonably controlling the focal length of the second positive lens in the second lens group is beneficial for the smooth emission of light to the first image plane, thus correcting astigmatism and field curvature in the system.

[0082] In an exemplary embodiment, the optical lens can satisfy the following condition: 0.60≤FG2 / FI≤0.80, where FG2 is the focal length of the second lens group and FI is the total focal length of the optical imaging group. Satisfying this condition helps to balance the focal length of the second lens group, keeping it within a reasonable range, which is beneficial for correcting residual chromatic aberration and various aberrations in the system, and achieving high resolution.

[0083] In an exemplary embodiment, the optical lens may satisfy the following condition: 1.05 ≤ F9b / FII ≤ 1.85, where F9b is the focal length of the first positive lens in the third lens group, and FⅠI is the total focal length of the optical rangefinder group. Satisfying this condition is beneficial for correcting various aberrations generated by the system and improving resolution.

[0084] In an exemplary embodiment, the optical lens can satisfy the following condition: 0.45 ≤ F10b / FII ≤ 1.30, where F10b is the focal length of the second positive lens in the third lens group, and FⅠI is the total focal length of the optical ranging group. Satisfying this condition facilitates the rapid convergence of light to the second image plane and helps reduce the total length of the rear light system.

[0085] In an exemplary embodiment, the optical lens can satisfy the following condition: 0.50≤FG3 / FII≤0.75, where FG3 is the focal length of the third lens group and FII is the total focal length of the optical rangefinder group. Satisfying this condition allows for reasonable control of the focal length of the third lens group, enabling it to have positive optical power, which is beneficial for quickly converging light to the second image plane and shortening the overall length.

[0086] In an exemplary embodiment, the optical lens can satisfy the following condition: 0.10 ≤ BFL1 / TTL1 ≤ 0.25, where BFL1 is the center distance from the image-side surface of the last lens in the second lens group to the first image plane, and TTL1 is the center distance from the object-side surface of the first lens in the first lens group to the first image plane. Satisfying this condition allows for an effective increase in the lens's back focal length while maintaining the same total optical length, which is beneficial for lens assembly.

[0087] In an exemplary embodiment, the optical lens can satisfy the following condition: 0.05 ≤ BFL2 / TTL2 ≤ 0.30, where BFL2 is the center distance from the image-side surface of the last lens in the third lens group to the second image plane, and TTL2 is the center distance from the object-side surface of the first lens in the first lens group to the second image plane. Satisfying this condition helps to control the distance from the image-side surface of the last lens in the third lens group to the image plane, shortening the overall length and reducing costs.

[0088] In an exemplary embodiment, the optical lens may satisfy the following condition: 0.20≤T / TTL1≤0.35, where T is the thickness of the reflective element and TTL1 is the center distance from the object side of the first lens in the first lens group to the first image plane. Satisfying this condition ensures that there is sufficient space to place the reflective element for beam splitting.

[0089] In an exemplary embodiment, the optical lens can satisfy the following condition: 0.05≤(T1+T2) / TTL1≤0.15, where T1 is the distance from the center of the image side of the last lens in the first lens group to the center of the reflecting element, T2 is the distance from the center of the reflecting element to the center of the object side of the first lens in the second lens group, and TTL1 is the distance from the center of the object side of the first lens in the first lens group to the center of the first image plane. Satisfying this condition allows for reasonable control of the distance between the reflecting element and the first and second lens groups, ensuring sufficient space for the reflecting element, reducing sensitivity, and facilitating system assembly.

[0090] In an exemplary embodiment, the optical lens can satisfy the following condition: 0.04≤T3 / TTL2≤0.09, where T3 is the distance from the center of the reflecting element to the center of the object-side surface of the first lens in the third lens group, and TTL2 is the distance from the object-side surface of the first lens in the first lens group to the center of the second image plane. Satisfying this condition allows for reasonable control of the distance between the prism and the first and third lens groups, ensuring sufficient space for the reflecting element, reducing sensitivity, and facilitating system assembly.

[0091] In an exemplary embodiment, the refractive index Nd9a and Abbe number Vd9a of the first positive lens in the second lens group satisfy: Nd9a ≥ 1.7; Vd9a ≤ 50. By using a material with high refractive index and low dispersion, it is beneficial to converge the main rays reflected by the reflecting element, reduce light loss, and improve image quality.

[0092] In an exemplary embodiment, the refractive index Nd9b and Abbe number Vd9b of the first positive lens in the third lens group satisfy: Nd9b ≥ 1.7; Vd9b ≤ 50. By using a material with high refractive index and low dispersion, it is beneficial to converge the main rays reflected by the reflecting element, reduce light loss, and improve image quality.

[0093] In an exemplary embodiment, the refractive index Nd1 of the first lens satisfies: 1.7 ≤ Nd1 ≤ 2.1. Satisfying this condition is beneficial for compressing light rays, reducing the lens aperture, and selecting a material with a higher refractive index can reduce surface curvature, reduce aberrations, and facilitate the achievement of high image quality.

[0094] In an exemplary embodiment, the Abbe number Vd5 of the fifth lens satisfies: 65 ≤ Vd5 ≤ 100. Satisfying this condition can reduce the generation of chromatic aberration, lower the difficulty of chromatic aberration correction in the system, and facilitate the realization of infrared confocal focusing.

[0095] In an exemplary embodiment, the refractive index Vd8 of the eighth lens satisfies: 65 ≤ Vd8 ≤ 100. Satisfying this condition can reduce the generation of chromatic aberration, reduce the difficulty of chromatic aberration correction in the system, and facilitate the realization of infrared confocal lens.

[0096] The optical lens according to the exemplary embodiments of this application can be made entirely of glass lenses. Using glass lenses helps reduce costs; at the same time, glass also has high-temperature resistance, low thermal distortion rate, and high stability, which can avoid the impact of high temperatures on lens performance.

[0097] According to the embodiment of this application, the aperture number (FNO) of both the optical imaging group and the optical ranging group of the optical lens is about 1.2, which is beneficial for achieving large aperture characteristics, providing more incident light to the optical lens, increasing the light throughput of the system, and enhancing the imaging effect in low-light environments.

[0098] The optical lens according to the embodiments of this application can achieve infrared confocal characteristics, and can obtain clear images even in low-light environments at night.

[0099] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the zoom lens applicable to the above-described embodiments.

[0100] Example 1

[0101] The following is for reference Figure 1 The optical lens according to Embodiment 1 of this application is described.

[0102] like Figure 1 As shown, the optical lens in this embodiment includes a first lens group G1, a reflective element, a second lens group G2, and a third lens group G3. The first lens group G1 and the second lens group G2 form an optical imaging group, and the first lens group G1 and the third lens group G3 form an optical ranging group.

[0103] The optical lens of this embodiment includes a total of 12 lenses with optical power. The first lens group G1 has positive optical power and includes 8 lenses L1-L8; the second lens group G2 has positive optical power and includes 2 positive lenses L9a and L10a; the third lens group G3 has positive optical power and includes 2 lenses L9b and L10b.

[0104] In this embodiment, the first lens group G1 may also include an aperture stop STO located between the third lens L3 and the fourth lens L4.

[0105] In this embodiment, the optical lens may further include a filter CG for protecting the photosensitive element located on the imaging plane. For example, it may include a filter CG located between the second lens group G2 and the first image plane (IMA1).

[0106] In this embodiment, the second lens L2 and the third lens L3 in the first lens group G1 can form a cemented lens; the fourth lens L4 to the sixth lens L6 can form a cemented lens; and the seventh lens L7 and the eighth lens L8 can form a cemented lens.

[0107] Table 1 shows some basic parameters of each lens in the optical imaging group of the optical lens in this embodiment, including surface type, radius of curvature, thickness / distance, refractive index of the material, and Abbe number. The units for radius of curvature and thickness / distance are millimeters (mm).

[0108] Face number Surface type radius of curvature Thickness / Distance Refractive index Nd Abbe number Vd surf1 spherical 26.349 3.70 2.00 25.4 surf2 spherical 124.908 0.30 surf3 spherical 15.060 5.66 1.50 81.6 surf4 spherical -232.010 0.60 1.59 61.3 surf5 spherical 9.303 4.14 surf6 (STO) spherical Infinity 1.11 surf7 spherical -34.385 0.60 1.81 22.7 surf8 spherical 23.230 4.98 1.59 68.5 surf9 spherical -11.182 0.60 1.74 27.8 surf10 spherical 61.446 0.79 surf11 spherical -236.266 0.60 1.58 40.9 surf12 spherical 12.555 6.24 1.59 68.5 surf13 spherical -19.652 2.40 surf14 spherical Infinity 9.30 1.52 64.2 surf15 spherical Infinity 9.30 1.52 64.2 surf16 spherical Infinity 4.00 surf17a spherical 221.060 2.22 1.83 42.7 surf18a spherical -32.937 0.30 surf19a spherical 14.729 7.10 1.90 37.1 surf20a spherical 14.069 10.36 surf21a spherical Infinity 0.70 1.52 64.2 surf22a spherical Infinity 0.30 IMA1 spherical Infinity 0.00

[0109] Table 1

[0110] Table 2 shows some basic parameters of each lens in the optical ranging group of the optical lens in this embodiment, including surface type, radius of curvature, thickness / distance, refractive index of the material, and Abbe number.

[0111]

[0112]

[0113] Table 2

[0114] According to the optical lens of Embodiment 1 of this application, the aperture number FNO = 1.22, the total optical length of the optical imaging group is 75.304 mm, and the total optical length of the optical ranging group is 41.022 mm. The optical lens of this embodiment is advantageous in achieving large aperture characteristics, providing more incident light to the optical lens, which helps to increase the light throughput of the system and enhance the imaging effect in darker environments; it can also achieve infrared confocal focusing, so that clear images can be obtained even in low-light environments at night.

[0115] Example 2

[0116] The following is for reference Figure 2 This application describes a zoom lens according to Embodiment 2. For the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted in Embodiment 2 and the following embodiments.

[0117] like Figure 2 As shown, the optical lens in this embodiment includes a first lens group G1, a reflective element, a second lens group G2, and a third lens group G3. The first lens group G1 and the second lens group G2 form an optical imaging group, and the first lens group G1 and the third lens group G3 form an optical ranging group.

[0118] Table 3 shows some basic parameters of each lens in the optical imaging group of the optical lens in this embodiment, including surface type, radius of curvature, thickness / distance, refractive index of the material, and Abbe number.

[0119]

[0120]

[0121] Table 3

[0122] Table 4 shows some basic parameters of each lens in the optical ranging group of the optical lens in this embodiment, including surface type, radius of curvature, thickness / distance, refractive index of the material, and Abbe number.

[0123] Face number Surface type radius of curvature Thickness / Distance Refractive index Nd Abbe number Vd surf1 spherical 32.004 3.80 1.76 26.6 surf2 spherical -602.902 0.30 surf3 spherical 11.574 6.05 1.59 68.5 surf4 spherical 38.747 0.60 1.74 49.2 surf5 spherical 7.938 4.51 surf6 (STO) spherical Infinity 1.60 surf7 spherical -19.034 0.60 1.70 30.1 surf8 spherical 14.584 5.32 1.59 68.5 surf9 spherical -11.891 0.60 1.70 30.1 surf10 spherical 27.933 0.30 surf11 spherical 25.214 0.60 1.49 70.4 surf12 spherical 13.678 6.34 1.50 81.6 surf13 spherical -16.462 2.10 surf14 spherical Infinity 9.30 1.52 64.2 surf15 spherical Infinity -9.30 1.52 64.2 surf16 spherical Infinity -3.00 surf17b spherical -30.436 -2.58 1.91 35.3 surf18b spherical 60.248 -0.30 surf19b spherical -19.894 -3.04 1.77 49.6 surf20b spherical 35.931 -3.87 IMA2 spherical Infinity 0.00

[0124] Table 4

[0125] According to the optical lens of Embodiment 2 of this application, the aperture number FNO = 1.22, the total optical length of the optical imaging group is 76.000 mm, and the total optical length of the optical ranging group is 42.025 mm. The optical lens of this embodiment is advantageous for achieving large aperture characteristics, providing more incident light to the optical lens, which helps to increase the light throughput of the system and enhance the imaging effect in darker environments; it can also achieve infrared confocal focusing, so that clear images can be obtained even in low-light environments at night.

[0126] Example 3

[0127] The following is for reference Figure 3 The optical lens according to Embodiment 3 of this application is described.

[0128] like Figure 3 As shown, the optical lens in this embodiment includes a first lens group G1, a reflective element, a second lens group G2, and a third lens group G3. The first lens group G1 and the second lens group G2 form an optical imaging group, and the first lens group G1 and the third lens group G3 form an optical ranging group.

[0129] Table 5 shows some basic parameters of each lens in the optical imaging group of the optical lens in this embodiment, including surface type, radius of curvature, thickness / distance, refractive index of the material, and Abbe number.

[0130] Face number Surface type radius of curvature Thickness / Distance Refractive index Nd Abbe number Vd surf1 spherical 35.035 3.21 1.92 20.9 surf2 spherical 375.198 0.30 surf3 spherical 14.062 8.00 1.62 63.4 surf4 spherical 32.961 0.60 1.74 27.8 surf5 spherical 8.379 3.79 surf6 (STO) spherical Infinity 1.27 surf7 spherical -23.585 0.60 1.78 25.7 surf8 spherical 38.026 4.64 1.59 68.5 surf9 spherical -9.298 0.60 1.70 30.1 surf10 spherical 34.672 0.39 surf11 spherical 40.000 0.60 1.49 70.4 surf12 spherical 10.955 6.83 1.50 81.6 surf13 spherical -16.440 2.10 surf14 spherical Infinity 9.30 1.52 64.2 surf15 spherical Infinity 9.30 1.52 64.2 surf16 spherical Infinity 4.00 surf17a spherical 124.888 2.36 1.74 44.9 surf18a spherical -32.516 0.30 surf19a spherical 13.574 6.44 1.74 44.9 surf20a spherical 15.541 10.38 surf21a spherical Infinity 0.70 1.52 64.2 surf22a spherical Infinity 0.30 IMA1 spherical Infinity 0.00

[0131] Table 5

[0132] Table 6 shows some basic parameters of each lens in the optical ranging group of the optical lens in this embodiment, including surface type, radius of curvature, thickness / distance, refractive index of the material, and Abbe number.

[0133]

[0134]

[0135] Table 6

[0136] According to the optical lens of Embodiment 3 of this application, the aperture number FNO = 1.20, the total optical length of the optical imaging group is 76.000 mm, and the total optical length of the optical ranging group is 42.225 mm. The optical lens of this embodiment is advantageous for achieving large aperture characteristics, providing more incident light to the optical lens, which helps to increase the light throughput of the system and enhance the imaging effect in darker environments; it can also achieve infrared confocal focusing, so that clear images can be obtained even in low-light environments at night.

[0137] Example 4

[0138] The following is for reference Figure 4The optical lens according to Embodiment 4 of this application is described.

[0139] like Figure 4 As shown, the optical lens in this embodiment includes a first lens group G1, a reflective element, a second lens group G2, and a third lens group G3. The first lens group G1 and the second lens group G2 form an optical imaging group, and the first lens group G1 and the third lens group G3 form an optical ranging group.

[0140] Table 7 shows some basic parameters of each lens in the optical imaging group of the optical lens in this embodiment, including surface type, radius of curvature, thickness / distance, refractive index of the material, and Abbe number.

[0141] Face number Surface type radius of curvature Thickness / Distance Refractive index Nd Abbe number Vd surf1 spherical 36.844 3.23 1.92 20.9 surf2 spherical 1198.421 0.30 surf3 spherical 12.279 5.74 1.59 68.5 surf4 spherical 38.863 1.21 1.75 35.0 surf5 spherical 8.464 4.41 surf6 (STO) spherical Infinity 1.46 surf7 spherical -22.729 0.60 1.81 22.7 surf8 spherical 19.479 4.42 1.59 68.5 surf9 spherical -14.907 0.60 1.60 38.0 surf10 spherical 38.899 0.31 surf11 spherical 40.000 0.60 1.49 70.4 surf12 spherical 10.799 7.01 1.50 81.6 surf13 spherical -20.590 2.10 surf14 spherical Infinity 9.30 1.52 64.2 surf15 spherical Infinity 9.30 1.52 64.2 surf16 spherical Infinity 4.00 surf17a spherical 136.629 2.28 1.77 49.6 surf18a spherical -34.148 0.30 surf19a spherical 14.727 7.60 1.74 49.2 surf20a spherical 15.887 10.23 surf21a spherical Infinity 0.70 1.52 64.2 surf22a spherical Infinity 0.30 IMA1 spherical Infinity 0.00

[0142] Table 7

[0143] Table 8 shows some basic parameters of each lens in the optical ranging group of the optical lens in this embodiment, including surface type, radius of curvature, thickness / distance, refractive index of the material, and Abbe number.

[0144] Face number Surface type radius of curvature Thickness / Distance Refractive index Nd Abbe number Vd surf1 spherical 36.844 3.23 1.92 20.9 surf2 spherical 1198.421 0.30 surf3 spherical 12.279 5.74 1.59 68.5 surf4 spherical 38.863 1.21 1.75 35.0 surf5 spherical 8.464 4.41 surf6 (STO) spherical Infinity 1.46 surf7 spherical -22.729 0.60 1.81 22.7 surf8 spherical 19.479 4.42 1.59 68.5 surf9 spherical -14.907 0.60 1.60 38.0 surf10 spherical 38.899 0.31 surf11 spherical 40.000 0.60 1.49 70.4 surf12 spherical 10.799 7.01 1.50 81.6 surf13 spherical -20.590 2.10 surf14 spherical Infinity 9.30 1.52 64.2 surf15 spherical Infinity -9.30 1.52 64.2 surf16 spherical Infinity -3.00 surf17b spherical -50.253 -2.54 1.95 18.0 surf18b spherical 37.711 -0.30 surf19b spherical -21.422 -2.66 2.05 26.9 surf20b spherical 56.090 -3.71 IMA2 spherical Infinity 0.00

[0145] Table 8

[0146] According to the optical lens of Embodiment 4 of this application, the aperture number FNO = 1.20, the total optical length of the optical imaging group is 76.000 mm, and the total optical length of the optical ranging group is 41.288 mm. The optical lens of this embodiment is advantageous in achieving large aperture characteristics, providing more incident light to the optical lens, which helps to increase the light throughput of the system and enhance the imaging effect in darker environments; it can also achieve infrared confocal focusing, so that clear images can be obtained even in low-light environments at night.

[0147] In summary, the lenses in Embodiments 1 to 4 satisfy the conditions shown in Table 9 below.

[0148]

[0149]

[0150] Table 9

[0151] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical lens, characterized in that, include: A first lens group with positive optical power; Reflective element; A second lens group with positive optical power; as well as A third lens group with positive optical power; The reflective element is disposed between the light-emitting side of the first lens group and the light-incident side of the second lens group. The light emitted from the first lens group is incident on the second lens group along the first direction and imaged on the first image plane via the reflective element, and incident on the third lens group along the second direction and imaged on the second image plane. The first lens group and the second lens group form an optical imaging group; the first lens group and the third lens group form an optical ranging group. The optical lens contains twelve lenses with optical power. The first lens group includes, in sequence from the object side to the image side along the first direction: a first lens with positive optical power, a second lens with positive optical power, a third lens with negative optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, a seventh lens with negative optical power, and an eighth lens with positive optical power. The second lens group comprises, sequentially from the object side to the image side along the first direction, a first lens having a positive lens and a second lens having a positive optical power; The third lens group, along the second direction from the object side to the image side, sequentially includes: a first lens having a positive lens and a second lens having a positive optical power; There is a certain deflection angle between the first direction and the second direction; The focal length FG1 of the first lens group and the total focal length FI of the optical imaging group satisfy: 6.95≤FG1 / FI≤8.

65.

2. The optical lens according to claim 1, wherein, In the second lens group, The object-side and image-side surfaces of the first positive lens are both convex. The object-side surface of the second positive lens is convex, and the image-side surface is concave.

3. The optical lens according to claim 1, wherein, In the third lens group The image-side surface of the first positive lens is convex; The image-side surface of the second positive lens is convex.

4. The optical lens according to claim 1, wherein, The first lens group further includes: an aperture stop placed between the third lens and the fourth lens; The object-side surface of the first lens is convex. The object-side surface of the second lens is convex. The image-side surface of the third lens is concave; Both the object-side and image-side surfaces of the fourth lens are concave. Both the object-side and image-side surfaces of the fifth lens are convex. Both the object-side and image-side surfaces of the sixth lens are concave. The image-side surface of the seventh lens is concave; The object-side and image-side surfaces of the eighth lens are both convex.

5. The optical lens according to claim 4, wherein, The focal length F1 of the first lens and the total focal length FI of the optical imaging group satisfy the following condition: 0.95≤F1 / FI≤1.

45.

6. The optical lens according to claim 4, wherein, The combined focal length F23 of the second lens and the third lens satisfies the following condition with respect to the total focal length FI of the optical imaging group: -1.85≤F23 / FI≤-1.

35.

7. The optical lens according to claim 4, wherein, The combined focal length F456 of the fourth lens, the fifth lens and the sixth lens satisfies the following condition with respect to the total focal length FI of the optical imaging group: -0.65≤F456 / FI≤-0.

30.

8. The optical lens according to claim 4, wherein, The combined focal length F78 of the seventh lens and the eighth lens satisfies the following condition with the total focal length FI of the optical imaging group: 0.60≤F78 / FI≤1.

20.

9. The optical lens according to claim 4, wherein, The combined focal length F13 of the first lens, the second lens, and the third lens, and the combined focal length F48 of the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens satisfy the following condition: -1.20≤F13 / F48≤-0.

90.

10. The optical lens according to claim 2, wherein, The focal length F9a of the first positive lens of the second lens group satisfies the following condition with the total focal length FI of the optical imaging group: 1.00≤F9a / FI≤1.

30.

11. The optical lens according to claim 2, wherein, The focal length F10a of the second positive lens of the second lens group satisfies the following condition with the total focal length FI of the optical imaging group: 1.65≤F10a / FI≤2.

90.

12. The optical lens according to claim 1, wherein, The focal length FG2 of the second lens group and the total focal length FI of the optical imaging group satisfy the condition: 0.60≤FG2 / FI≤0.

80.

13. The optical lens according to claim 3, wherein, The focal length F9b of the first positive lens of the third lens group satisfies the following condition with the total focal length FII of the optical ranging group: 1.05≤F9b / FII≤1.

85.

14. The optical lens according to claim 3, wherein, The focal length F10b of the second positive lens of the third lens group satisfies the following condition with the total focal length FII of the optical ranging group: 0.45≤F10b / FII≤1.

30.

15. The optical lens according to claim 1, wherein, The focal length FG3 of the third lens group and the total focal length FII of the optical ranging group satisfy the following condition: 0.50≤FG3 / FII≤0.

75.

16. The optical lens according to any one of claims 1-9, wherein, The distance BFL1 from the image side surface of the last lens in the second lens group to the center of the first image plane and the distance TTL1 from the object side surface of the first lens in the first lens group to the center of the first image plane satisfy the following condition: 0.10≤BFL1 / TTL1≤0.

25.

17. The optical lens according to any one of claims 1-9, wherein, The distance BFL2 from the image side of the last lens in the third lens group to the center of the second image plane satisfies the condition that 0.05 ≤ BFL2 / TTL2 ≤ 0.30 with respect to the distance TTL2 from the object side of the first lens in the first lens group to the center of the second image plane.

18. The optical lens according to any one of claims 1-9, wherein, The thickness T of the reflective element and the center distance TTL1 from the object side of the first lens in the first lens group to the first image plane satisfy the following condition: 0.20≤T / TTL1≤0.

35.

19. The optical lens according to any one of claims 1-9, wherein, The distance T1 from the center of the image side of the last lens in the first lens group to the center of the reflecting element, the distance T2 from the center of the reflecting element to the center of the object side of the first lens in the second lens group, and the distance TTL1 from the object side of the first lens in the first lens group to the center of the first image plane satisfy: 0.05≤(T1+T2) / TTL1≤0.

15.

20. The optical lens according to any one of claims 1-9, wherein, The distance T3 from the center of the reflecting element to the center of the object side surface of the first lens in the third lens group satisfies the following condition: 0.04 ≤ T3 / TTL2 ≤ 0.

09.

21. The optical lens according to any one of claims 1-9, wherein, The refractive index Nd9a and Abbe number Vd9a of the first positive lens in the second lens group satisfy: Nd9a≥1.7; Vd9a≤50.

22. The optical lens according to any one of claims 1-9, wherein, The refractive index Nd9b and Abbe number Vd9b of the first positive lens in the third lens group satisfy: Nd9b≥1.7; Vd9b≤50.

23. The optical lens according to any one of claims 4-9, wherein, The refractive index Nd1 of the first lens satisfies: 1.7≤Nd1≤2.

1.

24. The optical lens according to any one of claims 4-9, wherein, The Abbe number Vd5 of the fifth lens satisfies: 65≤Vd5≤100.

25. The optical lens according to any one of claims 4-9, wherein, The Abbe number Vd8 of the eighth lens satisfies: 65≤Vd8≤100.

26. The optical lens according to any one of claims 1-17, wherein, The optical lens also includes a detector for measuring the object distance based on the energy collected by the optical ranging group.

27. The optical lens according to claim 1, wherein, The optical lens satisfies any one of the following conditions: 1.055≤F1 / FI≤1.344 -1.737≤F23 / FI≤-1.464, -0.527≤F456 / FI≤-0.384, 0.680≤F78 / FI≤1.117 -1.051≤F13 / F48≤-0.934, 7.534≤FG1 / FI≤8.533 1.110≤F9a / FI≤1.147, 1.940≤F10a / FI≤2.740 0.644≤FG2 / FI≤0.677 1.182≤F9b / FII≤1.498, 0.653≤F10b / FII≤1.168 0.592≤FG3 / FII≤0.634 0.148≤BFL1 / TTL1≤0.151 0.090≤BFL2 / TTL2≤0.207 0.245≤T / TTL1≤0.247, 0.080≤(T1+T2) / TTL1≤0.085, 0.071≤T3 / TTL2≤0.073 1.74≤Nd9a≤1.83, 42.7≤Vd9a≤49.6, 1.81≤Nd9b≤1.95, 18≤Vd9b≤46.6, 1.76≤Nd1≤2.00, 65≤Vd5≤68.5, 68.5≤Vd8≤81.6, Wherein, F1 is the focal length of the first lens, F23 is the combined focal length of the second and third lenses, F456 is the combined focal length of the fourth, fifth, and sixth lenses, F78 is the combined focal length of the seventh and eighth lenses, F13 is the combined focal length of the first, second, and third lenses, F48 is the combined focal length of the fourth, fifth, sixth, seventh, and eighth lenses, F9a is the focal length of the first positive lens of the second lens group, F10a is the focal length of the second positive lens of the second lens group, FG2 is the focal length of the second lens group, F9b is the focal length of the first positive lens of the third lens group, FII is the total focal length of the optical ranging group, F10b is the focal length of the second positive lens of the third lens group, FG3 is the focal length of the third lens group, BFL1 is the distance from the image side of the last lens in the second lens group to the center of the first image plane, and TTL1 is the focal length of the first lens. The distance from the object-side surface of the first lens in a lens group to the center of the first image plane; BFL2 is the distance from the image-side surface of the last lens in the third lens group to the center of the second image plane; TTL2 is the distance from the object-side surface of the first lens in the first lens group to the center of the second image plane; T is the thickness of the reflecting element; T1 is the distance from the center of the image-side surface of the last lens in the first lens group to the center of the reflecting element; T2 is the distance from the center of the reflecting element to the center of the object-side surface of the first lens in the second lens group; T3 is the distance from the center of the reflecting element to the center of the object-side surface of the first lens in the third lens group; Nd9a is the refractive index of the first positive lens in the second lens group; Vd9a is the Abbe number of the first positive lens in the second lens group; Nd9b is the refractive index of the first positive lens in the third lens group; Vd9b is the Abbe number of the first positive lens in the third lens group; Nd1 is the refractive index of the first lens; Vd5 is the Abbe number of the fifth lens; and Vd8 is the Abbe number of the eighth lens.

Images