Observing and aiming lens

Abstract

The invention discloses an observing and aiming lens. The observing and aiming lens sequentially comprises a first lens with positive focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, a sixth lens with positive focal power and a seventh lens with positive focal power from an object side to an image side along an optical axis, the eighth lens has negative focal power; the ninth lens has negative focal power; the combined effective focal length Fa of the second lens, the third lens, the fourth lens and the fifth lens and the effective focal length F of the observing and aiming lens meet the condition that Fa / F is larger than or equal to-1.50 and smaller than or equal to-0.30.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and more specifically, to a sighting lens. Background Art

[0002] The sighting lens is also called the sighting lens and the sniper scope, which allows the user to see the target more clearly. Overall, people have the following five main technical requirements for the sighting lens: 1) As a handheld product, the sighting lens pays more attention to portability, and the weight and volume of the lens must be small enough, so the sighting lens is required to be miniaturized; 2) The sighting lens is used to observe the details of objects, and the object side field of view is small, so the lens needs to have a longer focal length; 3) In order to meet the need to distinguish tiny details, the sighting lens is required to have high image quality and low ghosting; 4) In order to meet the needs of night observation, the sighting lens is required to have infrared confocal; 5) In order to meet the needs of dim scenes such as dusk and early morning, the sighting lens is required to meet the wide spectrum 430nm~940nm high resolution, so the wide spectrum chromatic aberration correction of the sighting lens is required.

[0003] However, the sighting lens in the prior art still has the following shortcomings: 1) It is difficult for the sighting lens in the prior art to take into account both the lens aperture and high image quality; 2) It is difficult for the sighting lens in the prior art to achieve both long focus and a shorter total optical length; 3) The sighting lens in the prior art has a narrow wavelength band, making it difficult to achieve infrared confocality; 4) There is little room for ghost image optimization in the sighting lens in the prior art, making it difficult to take into account high image quality; 5) It is difficult for the sighting lens in the prior art to achieve high resolution in a wide spectrum of 430nm~940nm. Summary of the invention

[0004] On one hand, the present application provides a viewing and aiming lens, which includes, in order from the object side to the image side along the optical axis: a first lens with positive focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, a sixth lens with positive focal power, a seventh lens with positive focal power, an eighth lens with negative focal power, and a ninth lens with negative focal power; a combined effective focal length Fa of the second lens, the third lens, the fourth lens, and the fifth lens and an effective focal length F of the viewing and aiming lens satisfy: -1.50≤Fa / F≤-0.30.

[0005] In one embodiment, 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; the object side surface and the image side surface of the fourth lens are both convex; the object side surface and the image side surface of the fifth lens are both concave; the image side surface of the sixth lens is convex; the object side surface and the image side surface of the seventh lens are both convex; the object side surface and the image side surface of the eighth lens are both concave; and the object side surface of the ninth lens is concave.

[0006] In one embodiment, the maximum light transmission full aperture Dmax of the aiming and viewing lens and the distance TTL from the object side surface of the first lens to the imaging surface of the aiming and viewing lens on the optical axis satisfy the following conditions: 0.3≤Dmax / TTL≤0.55.

[0007] In one embodiment, the distance TTL from the object side surface of the first lens to the imaging surface of the viewing and aiming lens on the optical axis and the effective focal length F of the viewing and aiming lens satisfy: 1≤TTL / F≤1.5.

[0008] In one embodiment, the back focus BFL of the aiming and viewing lens and the distance TTL from the object side surface of the first lens to the imaging surface of the aiming and viewing lens on the optical axis satisfy: 0.15≤BFL / TTL≤0.4.

[0009] In one embodiment, the aiming and viewing lens satisfies: 0.6≤F1 / F≤1.6, where F1 is the effective focal length of the first lens.

[0010] In one embodiment, the aiming lens satisfies: 0.4≤F2 / F≤1.3, where F2 is the effective focal length of the second lens.

[0011] In one embodiment, the aiming lens satisfies: -0.6≤F3 / F≤-0.15, where F3 is the effective focal length of the third lens.

[0012] In one embodiment, the aiming and viewing lens satisfies: 0.15≤F4 / F≤0.50, where F4 is the effective focal length of the fourth lens.

[0013] In one embodiment, the aiming and viewing lens satisfies: -0.35≤F5 / F≤-0.20, where F5 is the effective focal length of the fifth lens.

[0014] In one embodiment, the aiming and viewing lens satisfies: 0.30≤F6 / F≤0.90, where F6 is the effective focal length of the sixth lens.

[0015] In one embodiment, the aiming and viewing lens satisfies: 0.10≤F7 / F≤0.80, where F7 is the effective focal length of the seventh lens.

[0016] In one embodiment, the aiming lens satisfies: -1.0≤F8 / F≤-0.15, where F8 is the effective focal length of the eighth lens.

[0017] In one embodiment, the aiming lens satisfies: -1≤F9 / F≤-0.20, where F9 is the effective focal length of the ninth lens.

[0018] In one embodiment, the aiming lens satisfies: 0.8≤Fb / F≤10.5, where Fb is the combined effective focal length of the seventh lens and the eighth lens.

[0019] In one embodiment, the aiming lens satisfies: 0.4≤F18 / F≤1.0, wherein F18 is a combined effective focal length of the first lens to the eighth lens.

[0020] In one embodiment, the aiming lens satisfies: -1.5≤F18 / F9≤-0.6, wherein Fb is the combined effective focal length of the seventh lens and the eighth lens, F18 is the combined effective focal length of the first lens to the eighth lens, and F9 is the effective focal length of the ninth lens.

[0021] In one embodiment, the sighting lens satisfies at least one of the following conditions: 1.7≤ND1≤2.2, 45≤VD2≤100, 45≤VD4≤100, wherein ND1 is the refractive index of the first lens, VD2 is the Abbe number of the second lens, and VD4 is the Abbe number of the fourth lens.

[0022] In one embodiment, the sighting lens satisfies at least one of the following: 0.40≤Dmax / TTL≤0.5, 1.05≤TTL / F≤1.25, 0.18≤BFL / TTL≤0.32, 0.8≤F1 / F≤1.4, 0.6≤F2 / F≤1, -0.5≤F3 / F≤-0.2, 0.2≤F4 / F≤0.4, -0.3≤F5 / F≤-0 .25, 0.4≤F6 / F≤0.75, 0.2≤F7 / F≤0.62, -0.9≤F8 / F≤-0.2, -0.85≤F9 / F≤-0.45, -1.22≤Fa / F≤-0.5, 1≤Fb / F≤10.2, 0.6≤F18 / F≤0.75, -1.3≤F18 / F9≤-0.8, 1.8≤ND1≤2.2, 60≤ VD2≤100, 60≤VD4≤100, wherein Dmax is the maximum clear aperture of the observation and aiming lens, TTL is the distance from the object side surface of the first lens to the imaging surface of the observation and aiming lens on the optical axis, BFL is the back focus of the observation and aiming lens, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, F7 is the effective focal length of the seventh lens, F8 is the effective focal length of the eighth lens, F9 is the effective focal length of the ninth lens, Fb is the combined effective focal length of the seventh lens and the eighth lens, F18 is the combined effective focal length of the first lens to the eighth lens, ND1 is the refractive index of the first lens, VD2 is the Abbe number of the second lens, and VD4 is the Abbe number of the fourth lens.

[0023] Another aspect of the present application provides an electronic device, which includes a sighting lens provided by the present application and an imaging element for converting an optical image formed by the sighting lens into an electrical signal.

[0024] The sighting and aiming lens provided in the present application adopts nine lenses. By reasonably setting the optical focal length of each lens and reasonably allocating the combined effective focal length of the second lens, the third lens, the fourth lens and the fifth lens, it is beneficial to achieve wide-spectrum apochromatism and infrared confocality. The sighting and aiming lens provided in the present application has at least one beneficial effect of miniaturization, high resolution, low ghost images, infrared confocality, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 Schematic diagram of the structure of the aiming and viewing lens according to Embodiment 1 of the present application; Figure 2 is a relative illumination curve diagram of the aiming and viewing lens according to Example 1 of the present application; Figure 3 is a Ray Fan diagram of the aiming and viewing lens according to Example 1 of the present application; Figure 4 Schematic diagram of the structure of the aiming and viewing lens according to Embodiment 2 of the present application; Figure 5 is a relative illumination curve diagram of the aiming and viewing lens according to Embodiment 2 of the present application; Figure 6 is a Ray Fan diagram of the aiming and viewing lens according to Embodiment 2 of the present application; Figure 7 Schematic diagram of the structure of the aiming and viewing lens according to Embodiment 3 of the present application; Figure 8 is a relative illumination curve diagram of the aiming and viewing lens according to Example 3 of the present application; Fig. 9 is a Ray Fan diagram of the aiming and viewing lens according to Example 3 of the present application; Fig.10 Schematic diagram of the structure of the aiming and viewing lens according to Embodiment 4 of the present application; Fig.11 is a relative illumination curve diagram of the aiming and viewing lens according to Example 4 of the present application; Fig.12 is a Ray Fan diagram of the aiming and viewing lens according to Example 4 of the present application; Fig.13 Schematic diagram of the structure of the aiming and viewing lens according to Embodiment 5 of the present application; Fig.14 is a relative illumination curve diagram of the aiming and viewing lens according to Example 5 of the present application; Fig.15 is a Ray Fan diagram of the aiming lens according to Example 5 of the present application; Fig.16Schematic diagram of the structure of the aiming and viewing lens according to Embodiment 6 of the present application; Fig.17 is a relative illumination curve diagram of the aiming and viewing lens according to Example 6 of the present application; Fig.18 It is a Ray Fan diagram of the aiming lens according to Example 6 of the present application. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same figure numbers refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0027] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0028] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0029] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface type in the paraxial area can be judged according to the general method in this field, for example, judging the concave and convex by the positive and negative R value (R refers to the radius of curvature of the paraxial area). In this article, the surface of each lens closest to the subject is called the object side of the lens, and the surface of each lens closest to the imaging side is called the image side of the lens. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0030] It should also be understood that the terms "comprises", "including", "having", "includes" 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. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0031] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The features, principles and other aspects of the present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] In an exemplary embodiment, the viewing lens provided by the present application may include, for example, nine lenses with optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens. The nine lenses are arranged in sequence from the object side to the image side along the optical axis.

[0034] In an exemplary embodiment, the sighting lens may further include a photosensitive element disposed on the image side of the ninth lens. Optionally, the photosensitive element disposed on the image side of the ninth lens may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

[0035] In an exemplary embodiment, the sighting lens may further include an aperture for limiting the light beam to further improve the imaging quality of the sighting lens. Exemplarily, the aperture may be disposed between the first lens and the second lens. The aperture is conducive to converging the light entering the sighting lens and effectively controlling the amount of light passing through. It can also shorten the total length of the sighting lens, which is conducive to miniaturization while improving the imaging quality of the sighting lens. However, it should be noted that the position of the aperture disclosed herein is only an example and not a limitation; in alternative embodiments, the aperture may also be disposed at other positions according to actual needs.

[0036] In an exemplary embodiment, the first lens may have positive focal power, with a convex object side and a concave or flat image side. The focal power of the first lens is positive, and it bears the main focal power of the system. The light is collected by the first lens, so that the light emitted by the first lens is close to the optical axis, reducing the aperture of the rear lens, which is conducive to miniaturization. The image side of the first lens is a plane or concave surface, which is conducive to reducing the incident angle of the axial light on the image side of the first lens, reducing the spherical aberration generated by the image side of the first lens, and is conducive to achieving high image quality; the first lens can select a material with a larger refractive index, reduce the surface curvature, reduce the generation of aberrations, and is conducive to achieving high image quality; the first lens can also select a material with a positive and large anomalous dispersion, which is conducive to achieving wide-spectrum apochromatism and infrared confocality.

[0037] In an exemplary embodiment, the second lens may have positive focal power, and its object side surface is convex, and its image side surface is convex or concave. When the object side surface of the second lens is convex and the image side surface is concave, the second lens is in a meniscus shape, which is conducive to reducing the incident angle of the axial light on the image side surface of the second lens, reducing the spherical aberration generated by the image side surface of the second lens, and is conducive to achieving high image quality; when the object side surface and the image side surface of the second lens are both convex, the object side surface and the image side surface share the focal power, reduce the surface curvature, reduce the generation of aberrations, and are conducive to achieving high image quality; the second lens can be matched with low dispersion materials to reduce the generation of chromatic aberrations and reduce the difficulty of system correction, which is conducive to achieving high image quality; the second lens can also select materials with positive and large anomalous dispersion, which is conducive to achieving wide-spectrum apochromatism and infrared confocality; optionally, the second lens, the third lens, the fourth lens and the fifth lens can form a four-cemented lens group, and the second lens has positive focal power in the four-cemented lens group, and is matched with the third lens, the fourth lens and the fifth lens to achieve correction of apochromatism and spherical aberration, which is conducive to achieving high image quality.

[0038] In an exemplary embodiment, the third lens may have negative optical power, and its object side surface is convex or concave, and the image side surface is concave. The image side surface of the third lens is concave, and negative spherical aberration can be introduced to balance the positive spherical aberration generated by the first lens, which is conducive to achieving high image quality; when the object side surface and the image side surface of the third lens are both concave, the object side surface and the image side surface share the optical power, reduce the surface curvature, reduce the generation of aberration, and are conducive to achieving high image quality; when the object side surface of the third lens is convex and the image side surface is concave, it is conducive to reducing the incident angle of the axial light, reducing the generation of spherical aberration, and at the same time, it is conducive to reducing the tolerance sensitivity; the third lens can select a material with negative anomalous dispersion and a small value, which is conducive to achieving wide-spectrum apochromatism and infrared confocality; optionally, the second lens, the third lens, the fourth lens and the fifth lens can form a four-cemented lens group, and the third lens has negative optical power in the four-cemented lens group, and is matched with the second lens, the fourth lens and the fifth lens to achieve the correction of apochromatism and spherical aberration, which is conducive to achieving high image quality.

[0039] In an exemplary embodiment, the fourth lens may have positive focal power, and its object side surface is convex, and its image side surface is convex. The object side surface and the image side surface of the fourth lens are both convex, which share the focal power, reduce the surface curvature, reduce the generation of aberrations, and are conducive to achieving high image quality; the object side surface of the fourth lens is convex, which can reduce the incident angle of the axial light, reduce the generation of spherical aberration, and is conducive to achieving high image quality; the fourth lens can be selected from a material with positive and large anomalous dispersion, which is conducive to achieving wide-spectrum apochromatism and infrared confocality; optionally, the second lens, the third lens, the fourth lens and the fifth lens can form a four-cemented lens group, and the fourth lens has positive focal power in the four-cemented lens group, and is matched with the second lens, the third lens and the fifth lens to achieve correction of apochromatism and spherical aberration, which is conducive to achieving high image quality.

[0040] In an exemplary embodiment, the fifth lens may have negative optical power, and its object side surface and image side surface are both concave. The object side surface and image side surface of the fifth lens are both concave, which share the optical power, reduce the surface curvature, reduce the generation of aberrations, and are conducive to achieving high image quality; optionally, the second lens, the third lens, the fourth lens and the fifth lens can form a four-cemented lens group, and the fifth lens has negative optical power in the four-cemented lens group, and is used with the second lens, the third lens and the fourth lens to achieve correction of achromatism and spherical aberration, which is conducive to achieving high image quality.

[0041] In an exemplary embodiment, the sixth lens may have positive focal power, and its object side surface may be convex, flat or concave, and the image side surface is convex. The object side surface and the image side surface of the sixth lens are both convex, which share the focal power, reduce the surface curvature, reduce the generation of aberrations, and are conducive to achieving high image quality; the object side surface of the sixth lens is flat or concave, which reduces the focusing ability of the surface on light, and even makes it have the ability to diverge light, which is conducive to improving the ghost image generated by this surface and the protective glass (set between the ninth lens and the imaging surface), so that the ghost energy is diverged, and the image quality of the image surface is clear; the sixth lens can be selected from a material with a large refractive index, reduce the surface curvature, reduce the generation of aberrations, and is conducive to achieving high image quality; the focal power of the sixth lens is positive, which will introduce axial chromatic aberration. The sixth lens can balance the axial chromatic aberration of the system in conjunction with the second lens, the third lens, the fourth lens and the fifth lens, which is conducive to achieving high resolution of mixed light with a wide spectrum of 430nm~940nm.

[0042] In an exemplary embodiment, the seventh lens may have positive power, and its object side surface is convex, and its image side surface is convex. The object side surface and the image side surface of the seventh lens are both convex, and they share the power, reduce the surface curvature, and reduce the generation of aberrations, which is conducive to achieving high image quality; optionally, the seventh lens and the eighth lens can form a double-cemented lens group, and the seventh lens has positive power in the double-cemented lens group, and cooperates with the eighth lens to achieve achromatic aberration, which is conducive to achieving high image quality.

[0043] In an exemplary embodiment, the eighth lens may have negative power, and its object side and image side are both concave. The object side and image side of the eighth lens are both concave, which share the power, reduce the surface curvature, reduce the generation of aberrations, and are conducive to achieving high image quality; optionally, the seventh lens and the eighth lens can form a double-cemented lens group, and the eighth lens has negative power in the double-cemented lens group, and cooperates with the seventh lens to achieve achromatism, which is conducive to achieving high image quality.

[0044] In an exemplary embodiment, the ninth lens may have negative optical power, and its object side surface is concave, and its image side surface is convex or concave. When the object side surface of the ninth lens is concave and the image side surface is convex, the ninth lens is in a meniscus shape, which is conducive to correcting the off-axis aberrations such as field curvature and astigmatism of the system, and realizing a wide object distance high resolution from 1.5m to infinity; at the same time, the image side surface of the ninth lens is convex, so that it has the ability to diverge light, which is conducive to improving the ghost image generated by this surface and the protective glass (set between the ninth lens and the imaging surface), so that the ghost energy is diverged, and the image quality of the image surface is clear; when the object side surface and the image side surface of the ninth lens are both concave, they share the optical power together, reduce the surface curvature, reduce the generation of aberrations, and are conducive to achieving high image quality; the ninth lens has negative optical power, and is matched with the first lens to the eighth lens with positive optical power to form a telephoto structure, reduce the total optical length, and are conducive to miniaturization; the ninth lens can select a material with a larger refractive index to reduce the surface curvature and reduce the generation of aberrations, which is conducive to achieving high image quality.

[0045] In an exemplary embodiment, the second lens, the third lens, the fourth lens and the fifth lens may form a four-cemented lens group. The second lens has positive focal power, the third lens has negative focal power, the fourth lens has positive focal power, and the fifth lens has negative focal power, wherein the second lens and the fourth lens with positive focal power may be made of materials with larger Abbe numbers, which is beneficial to reducing the generation of chromatic aberration and achieving high image quality; further, materials with large abnormal dispersion may be selected, which is beneficial to correcting chromatic aberration and achieving infrared defocusing. Optionally, the object side surface of the second lens and the image side surface of the fifth lens have similar curvatures, and the four-cemented lens group is in a meniscus shape as a whole, which is beneficial to reducing the generation of spherical aberration.

[0046] In an exemplary embodiment, the seventh lens and the eighth lens may form a doublet lens group. The seventh lens has positive power, and the eighth lens has negative power. The curvature of the object side surface of the seventh lens and the image side surface of the eighth lens are similar, and the doublet lens group formed by the seventh lens and the eighth lens is in a meniscus shape as a whole, which is conducive to reducing the generation of spherical aberration.

[0047] In an exemplary embodiment, the sighting lens according to the present application may satisfy: -1.50≤Fa / F≤-0.30, wherein Fa is the combined effective focal length of the second lens, the third lens, the fourth lens, and the fifth lens, and F is the effective focal length of the sighting lens. More specifically, Fa and F may further satisfy -1.22≤Fa / F≤-0.5. Satisfying -1.50≤Fa / F≤-0.30 and reasonably allocating the combined effective focal length of the second lens, the third lens, the fourth lens, and the fifth lens is conducive to achieving wide-spectrum apochromatic aberration and infrared confocality.

[0048] In an exemplary embodiment, the sighting lens according to the present application may satisfy: 0.3≤Dmax / TTL≤0.55, wherein Dmax is the maximum full aperture of the sighting lens, and TTL is the distance from the object side of the first lens to the imaging surface of the sighting lens on the optical axis. More specifically, Dmax and TTL may further satisfy 0.40≤Dmax / TTL≤0.5. When 0.3≤Dmax / TTL≤0.55 is satisfied, under a certain system optical length, the maximum full aperture of the system is controlled, so that the maximum full aperture of the system is smaller, which is conducive to miniaturization.

[0049] In an exemplary embodiment, the sighting lens according to the present application may satisfy: 1≤TTL / F≤1.5, wherein TTL is the distance from the object side of the first lens to the imaging surface of the sighting lens on the optical axis, and F is the effective focal length of the sighting lens. More specifically, TTL and F may further satisfy 1.05≤TTL / F≤1.25. When 1≤TTL / F≤1.5 is satisfied, under a certain system focal length value, the total optical length of the system is controlled, so that the total optical length of the system is small, which is conducive to miniaturization.

[0050] In an exemplary embodiment, the sighting lens according to the present application may satisfy: 0.15≤BFL / TTL≤0.4, wherein BFL is the back focus of the sighting lens (i.e., the distance from the image side of the ninth lens to the imaging surface of the sighting lens on the optical axis), and TTL is the distance from the object side of the first lens to the imaging surface of the sighting lens on the optical axis. More specifically, BFL and TTL may further satisfy 0.18≤BFL / TTL≤0.32. Satisfying 0.15≤BFL / TTL≤0.4, while achieving miniaturization, by controlling the optical back focus length of the system, it is beneficial to take into account cameras with different interfaces and improve the versatility of the lens.

[0051] In an exemplary embodiment, the sighting lens according to the present application may satisfy: 0.6≤F1 / F≤1.6, where F1 is the effective focal length of the first lens, and F is the effective focal length of the sighting lens. More specifically, F1 and F may further satisfy 0.8≤F1 / F≤1.4. Satisfying 0.6≤F1 / F≤1.6, by reasonably allocating the focal length value of the first lens, light is collected through the first lens, and the light emitted by the first lens is moved closer to the optical axis, which is conducive to reducing the aperture of the rear lens and achieving miniaturization.

[0052] In an exemplary embodiment, the sighting lens according to the present application may satisfy: 0.4≤F2 / F≤1.3, where F2 is the effective focal length of the second lens, and F is the effective focal length of the sighting lens. More specifically, F2 and F may further satisfy 0.6≤F2 / F≤1. Satisfying 0.4≤F2 / F≤1.3, by reasonably allocating the focal length value of the second lens, the second lens has positive focal power in the four-lens group consisting of the second lens, the third lens, the fourth lens, and the fifth lens, thereby achieving achromatic aberration, which is conducive to achieving high image quality.

[0053] In an exemplary embodiment, the sighting lens according to the present application may satisfy: -0.6≤F3 / F≤-0.15, wherein F3 is the effective focal length of the third lens, and F is the effective focal length of the sighting lens. More specifically, F3 and F may further satisfy -0.5≤F3 / F≤-0.2. Satisfying -0.6≤F3 / F≤-0.15, by reasonably allocating the focal length value of the third lens, the third lens has a negative focal power in the four-lens group consisting of the second lens, the third lens, the fourth lens, and the fifth lens, thereby achieving achromatic aberration, which is conducive to achieving high image quality.

[0054] In an exemplary embodiment, the sighting lens according to the present application may satisfy: 0.15≤F4 / F≤0.50, where F4 is the effective focal length of the fourth lens, and F is the effective focal length of the sighting lens. More specifically, F4 and F may further satisfy 0.2≤F4 / F≤0.4. Satisfying 0.15≤F4 / F≤0.50, by reasonably allocating the focal length value of the fourth lens, the fourth lens has positive focal power in the four-lens group consisting of the second lens, the third lens, the fourth lens, and the fifth lens, and apochromatism is achieved, which is conducive to achieving high image quality.

[0055] In an exemplary embodiment, the sighting lens according to the present application may satisfy: -0.35≤F5 / F≤-0.20, wherein F5 is the effective focal length of the fifth lens, and F is the effective focal length of the sighting lens. More specifically, F5 and F may further satisfy -0.3≤F5 / F≤-0.25. Satisfying -0.35≤F5 / F≤-0.20, by reasonably allocating the focal length value of the fifth lens, the fifth lens has a negative focal power in the four-lens group consisting of the second lens, the third lens, the fourth lens, and the fifth lens, thereby achieving apochromatism, which is conducive to achieving high image quality.

[0056] In an exemplary embodiment, the sighting lens according to the present application may satisfy: 0.30≤F6 / F≤0.90, where F6 is the effective focal length of the sixth lens, and F is the effective focal length of the sighting lens. More specifically, F6 and F may further satisfy 0.4≤F6 / F≤0.75. Satisfying 0.30≤F6 / F≤0.90, by reasonably allocating the focal length value of the sixth lens, the sixth lens has positive focal power, and cooperates with the fifth lens to achieve apochromatism, which is conducive to achieving high image quality.

[0057] In an exemplary embodiment, the sighting lens according to the present application may satisfy: 0.10≤F7 / F≤0.80, where F7 is the effective focal length of the seventh lens, and F is the effective focal length of the sighting lens. More specifically, F7 and F may further satisfy 0.2≤F7 / F≤0.62. Satisfying 0.10≤F7 / F≤0.80, by reasonably allocating the focal length value of the seventh lens, the seventh lens has positive focal power in the doublet lens group composed of the seventh lens and the eighth lens, and the residual off-axis chromatic aberration is corrected, which is conducive to achieving high image quality.

[0058] In an exemplary embodiment, the sighting lens according to the present application may satisfy: -1.0≤F8 / F≤-0.15, where F8 is the effective focal length of the eighth lens, and F is the effective focal length of the sighting lens. More specifically, F8 and F may further satisfy -0.9≤F8 / F≤-0.2. Satisfying -1.0≤F8 / F≤-0.15, by reasonably allocating the focal length value of the eighth lens, the eighth lens has a negative focal power in the doublet lens group composed of the seventh lens and the eighth lens, and the residual off-axis chromatic aberration is corrected, which is conducive to achieving high image quality.

[0059] In an exemplary embodiment, the sighting lens according to the present application may satisfy: -1≤F9 / F≤-0.20, wherein F9 is the effective focal length of the ninth lens, and F is the effective focal length of the sighting lens. More specifically, F9 and F may further satisfy -0.85≤F9 / F≤-0.45. Satisfying -1≤F9 / F≤-0.20, by reasonably allocating the focal length value of the ninth lens, the ninth lens has a negative optical power, and is matched with the first lens to the eighth lens having positive optical power to form a telephoto architecture, thereby reducing the total optical length and facilitating miniaturization.

[0060] In an exemplary embodiment, the sighting lens according to the present application may satisfy: 0.8≤Fb / F≤10.5, where Fb is the combined effective focal length of the seventh lens and the eighth lens, and F is the effective focal length of the sighting lens. More specifically, Fb and F may further satisfy 1≤Fb / F≤10.2. Satisfying 0.8≤Fb / F≤10.5 and reasonably allocating the focal length value of the double cemented lens group composed of the seventh lens and the eighth lens is conducive to correcting the off-axis residual chromatic aberration and achieving infrared confocality.

[0061] In an exemplary embodiment, the sighting lens according to the present application may satisfy: 0.4≤F18 / F≤1.0, where F18 is the combined effective focal length of the first lens to the eighth lens, and F is the effective focal length of the sighting lens. More specifically, F18 and F may further satisfy 0.6≤F18 / F≤0.75. Satisfying 0.4≤F18 / F≤1.0, by reasonably allocating the combined effective focal length of the first lens to the eighth lens, so that it and the ninth lens form a telephoto architecture, it is beneficial to reduce the total optical length and achieve miniaturization.

[0062] In an exemplary embodiment, the sighting lens according to the present application may satisfy: -1.5≤F18 / F9≤-0.6. Among them, F18 is the combined effective focal length of the first lens to the eighth lens, and F9 is the effective focal length of the ninth lens. More specifically, F18 and F9 may further satisfy -1.3≤F18 / F9≤-0.8. Satisfying -1.5≤F18 / F9≤-0.6, by reasonably allocating the combined effective focal length of the first lens to the eighth lens and the focal length value of the ninth lens, it forms a telephoto architecture, which is conducive to reducing the total optical length and achieving miniaturization.

[0063] In an exemplary embodiment, the sighting lens according to the present application may satisfy: 1.7≤ND1≤2.2, where ND1 is the refractive index of the first lens. More specifically, ND1 may further satisfy 1.8≤ND1≤2.2. When 1.7≤ND1≤2.2 is satisfied, the refractive index of the first lens is reasonably set, the generation of dispersion is reduced, the difficulty of chromatic aberration correction of the system is reduced, and infrared confocalization is facilitated.

[0064] In an exemplary embodiment, the sighting lens according to the present application may satisfy: 45≤VD2≤100, where VD2 is the Abbe number of the second lens. More specifically, VD2 may further satisfy 60≤VD2≤100. By satisfying 45≤VD2≤100 and reasonably setting the Abbe number of the second lens, the generation of dispersion is reduced, the difficulty of chromatic aberration correction of the system is reduced, and infrared confocalization is facilitated.

[0065] In an exemplary embodiment, the sighting lens according to the present application may satisfy: 45≤VD4≤100, where VD4 is the Abbe number of the fourth lens. More specifically, VD4 may further satisfy 60≤VD4≤100. By satisfying 45≤VD4≤100 and reasonably setting the Abbe number of the fourth lens, the generation of dispersion is reduced, the difficulty of chromatic aberration correction of the system is reduced, and infrared confocalization is facilitated.

[0066] In an exemplary embodiment, the aperture number FNO of the sighting lens according to the present application satisfies: 1.6≤FNO≤3.0. By controlling the size of the entrance pupil diameter of the system, the system has a smaller aperture value, which is conducive to achieving a large aperture.

[0067] In an exemplary embodiment, the effective focal length F of the aiming lens according to the present application may be in the range of 35 mm to 45 mm, for example, F is 40 mm.

[0068] In an exemplary embodiment, as needed, the sighting lens of the present application may further include a filter and / or a protective glass disposed between the ninth lens and the imaging plane. The filter may filter light with different wavelengths, and the protective glass may prevent damage to the image-side element (e.g., chip) of the sighting lens.

[0069] In an exemplary embodiment, each lens of the aiming and viewing lens of the present application may be a spherical lens or an aspherical lens. As needed, the present application does not specifically limit the specific number of spherical lenses and aspherical lenses. When focusing on the imaging quality, the number of aspherical lenses can be increased, or even all lenses can use aspherical lenses. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality of the lens. Exemplarily, the first lens to the ninth lens disclosed in the present application are all spherical lenses.

[0070] Those skilled in the art should understand that the temperature coefficient of refractive index dn / dt and anomalous dispersion of plastics are relatively large. Reasonable matching of appropriate amounts of plastic materials is beneficial to high and low temperature balance and infrared confocality, but too many plastic lenses are not conducive to system stability. Optical lenses made of glass can suppress the deviation of the back focus of the optical lens with temperature changes to improve system stability; at the same time, the use of glass materials can avoid lens imaging blur caused by high and low temperature changes in the use environment, which affects the normal use of the lens. For example, the temperature range of optical lenses with all-glass design is relatively wide, and they can maintain stable optical performance in the range of -40℃ to 85℃. In addition, the use of glass materials can also better correct system chromatic aberration, improve lens resolution, and reduce the generation of ghost images.

[0071] The present application does not specifically limit the material of the lens. When focusing on the resolution quality and reliability, the first lens to the ninth lens can all be made of glass. Of course, in applications where the temperature stability requirements are low, the first lens to the ninth lens in the optical lens can also be made of plastic. Using plastic to make optical lenses can effectively reduce production costs. Of course, the first lens to the ninth lens in the optical lens can also be made of a combination of plastic and glass.

[0072] The aiming and viewing lens according to the above-mentioned embodiment of the present application may adopt multiple lenses, such as the nine lenses mentioned above. By reasonably allocating optical parameters such as the focal length and surface shape of each lens, at least one beneficial effect such as miniaturization, high resolution, low ghost images, and infrared confocality can be achieved.

[0073] However, it should be understood by those skilled in the art that, without departing from the technical solution claimed in the present application, the number of lenses constituting the lens can be changed to obtain the various results and advantages described in this specification. For example, although nine lenses are described as an example in the embodiment, the sighting lens is not limited to nine lenses. If necessary, the sighting lens may also include other numbers of lenses. The following further describes a specific embodiment of the sighting lens applicable to the above-mentioned embodiment with reference to the accompanying drawings. Example 1

[0074] The following reference Figure 1 The aiming lens according to Embodiment 1 of the present application is described. Figure 1 A schematic structural diagram of a viewing and aiming lens according to Embodiment 1 of the present application is shown.

[0075] like Figure 1 As shown, the aiming lens includes, from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8 and a ninth lens L9.

[0076] The first lens L1 has positive refractive power, an object-side surface S1 of which is convex, and an image-side surface S2 of which is concave.

[0077] The second lens L2 has positive refractive power, an object-side surface S4 thereof is convex, and an image-side surface S5 thereof is concave.

[0078] The third lens L3 has negative refractive power, and its object-side surface S5 is convex, and its image-side surface S6 is concave.

[0079] The fourth lens L4 has positive refractive power, and its object-side surface S6 is convex, and its image-side surface S7 is convex.

[0080] The fifth lens L5 has negative refractive power, and its object-side surface S7 is concave and its image-side surface S8 is concave.

[0081] The sixth lens L6 has positive refractive power, and its object-side surface S9 is a flat surface, and its image-side surface S10 is a convex surface.

[0082] The seventh lens L7 has positive refractive power, and its object-side surface S11 is convex, and its image-side surface S12 is convex.

[0083] The eighth lens L8 has negative refractive power, and its object-side surface S12 is concave, and its image-side surface S13 is concave.

[0084] The ninth lens L9 has negative refractive power, and its object-side surface S14 is concave, and its image-side surface S15 is concave.

[0085] The second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 may form a four-cemented lens group. The seventh lens L7 and the eighth lens L8 may form a doublet lens group.

[0086] The sighting lens may further include a stop STO, which may be disposed between the first lens L1 and the second lens L2. Optionally, the sighting lens may further include a filter (not shown) having an object side surface and an image side surface and / or a protective glass CG having an object side surface S16 and an image side surface S17. The filter may be used to correct color deviation, and the protective glass CG may be used to protect the image sensor chip located at the imaging surface IMA. Light from the object sequentially passes through each surface S1 to S17 and is finally imaged on the imaging surface IMA.

[0087] Table 1 shows the radius of curvature, thickness / distance, refractive index and Abbe number of each lens of the aiming lens of Example 1, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0088] Table 1

[0089] Figure 2The relative illumination curve of the aiming lens of Example 1 is shown, which indicates the relative illumination values ​​corresponding to different fields of view. Figure 3 The Ray Fan diagram of the aiming lens of Example 1 is shown, which indicates the aberrations corresponding to different fields of view. Figure 2 and Figure 3 It can be seen that the viewing and aiming lens provided in Example 1 has the characteristics of high illumination and low aberration, and can achieve good imaging quality. Example 2

[0090] The following reference Figure 4 The aiming lens according to Embodiment 2 of the present application is described. Figure 4 A schematic structural diagram of a viewing and aiming lens according to Embodiment 2 of the present application is shown.

[0091] like Figure 4 As shown, the aiming lens includes, from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8 and a ninth lens L9.

[0092] The first lens L1 has positive refractive power, an object-side surface S1 of which is convex, and an image-side surface S2 of which is flat.

[0093] The second lens L2 has positive refractive power, an object-side surface S4 thereof is convex, and an image-side surface S5 thereof is concave.

[0094] The third lens L3 has negative refractive power, and its object-side surface S5 is convex, and its image-side surface S6 is concave.

[0095] The fourth lens L4 has positive refractive power, and its object-side surface S6 is convex, and its image-side surface S7 is convex.

[0096] The fifth lens L5 has negative refractive power, and its object-side surface S7 is concave and its image-side surface S8 is concave.

[0097] The sixth lens L6 has positive refractive power, and its object-side surface S9 is a flat surface, and its image-side surface S10 is a convex surface.

[0098] The seventh lens L7 has positive refractive power, and its object-side surface S11 is convex, and its image-side surface S12 is convex.

[0099] The eighth lens L8 has negative refractive power, and its object-side surface S12 is concave, and its image-side surface S13 is concave.

[0100] The ninth lens L9 has negative refractive power, and its object-side surface S14 is concave, and its image-side surface S15 is convex.

[0101] The second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 may form a four-cemented lens group. The seventh lens L7 and the eighth lens L8 may form a doublet lens group.

[0102] The sighting lens may further include a stop STO, which may be disposed between the first lens L1 and the second lens L2. Optionally, the sighting lens may further include a filter (not shown) having an object side surface and an image side surface and / or a protective glass CG having an object side surface S16 and an image side surface S17. The filter may be used to correct color deviation, and the protective glass CG may be used to protect the image sensor chip located at the imaging surface IMA. Light from the object sequentially passes through each surface S1 to S17 and is finally imaged on the imaging surface IMA.

[0103] Table 2 shows the radius of curvature, thickness / distance, refractive index and Abbe number of each lens of the aiming lens of Example 2, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0104] Table 2

[0105] Figure 5 The relative illumination curve of the aiming lens of Example 2 is shown, which indicates the relative illumination values ​​corresponding to different fields of view. Figure 6 The Ray Fan diagram of the aiming lens of Example 2 is shown, which indicates the aberrations corresponding to different fields of view. Figure 5 and Figure 6 It can be seen that the viewing and aiming lens provided in Example 2 has the characteristics of high illumination and low aberration, and can achieve good imaging quality. Example 3

[0106] The following reference Figure 7 The aiming lens according to Embodiment 3 of the present application is described. Figure 7 A schematic structural diagram of a viewing and aiming lens according to Embodiment 3 of the present application is shown.

[0107] like Figure 7 As shown, the aiming lens includes, from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8 and a ninth lens L9.

[0108] The first lens L1 has positive refractive power, an object-side surface S1 of which is convex, and an image-side surface S2 of which is concave.

[0109] The second lens L2 has positive refractive power, an object-side surface S4 thereof is convex, and an image-side surface S5 thereof is concave.

[0110] The third lens L3 has negative refractive power, and its object-side surface S5 is convex, and its image-side surface S6 is concave.

[0111] The fourth lens L4 has positive refractive power, and its object-side surface S6 is convex, and its image-side surface S7 is convex.

[0112] The fifth lens L5 has negative refractive power, and its object-side surface S7 is concave and its image-side surface S8 is concave.

[0113] The sixth lens L6 has positive refractive power, and its object-side surface S9 is a flat surface, and its image-side surface S10 is a convex surface.

[0114] The seventh lens L7 has positive refractive power, and its object-side surface S11 is convex, and its image-side surface S12 is convex.

[0115] The eighth lens L8 has negative refractive power, and its object-side surface S12 is concave, and its image-side surface S13 is concave.

[0116] The ninth lens L9 has negative refractive power, and its object-side surface S14 is concave, and its image-side surface S15 is concave.

[0117] The second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 may form a four-cemented lens group. The seventh lens L7 and the eighth lens L8 may form a doublet lens group.

[0118] The sighting lens may further include a stop STO, which may be disposed between the first lens L1 and the second lens L2. Optionally, the sighting lens may further include a filter (not shown) having an object side surface and an image side surface and / or a protective glass CG having an object side surface S16 and an image side surface S17. The filter may be used to correct color deviation, and the protective glass CG may be used to protect the image sensor chip located at the imaging surface IMA. Light from the object sequentially passes through each surface S1 to S17 and is finally imaged on the imaging surface IMA.

[0119] Table 3 shows the radius of curvature, thickness / distance, refractive index and Abbe number of each lens of the aiming lens of Example 3, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0120] Table 3

[0121] Figure 8 The relative illumination curve of the aiming lens of Example 3 is shown, which indicates the relative illumination values ​​corresponding to different fields of view. Fig. 9 The Ray Fan diagram of the aiming lens of Example 3 is shown, which indicates the aberrations corresponding to different fields of view. Figure 8 and Fig. 9It can be seen that the viewing and aiming lens provided in Example 3 has the characteristics of high illumination and low aberration, and can achieve good imaging quality. Example 4

[0122] The following reference Fig.10 The aiming lens according to Embodiment 4 of the present application is described. Fig.10 A schematic structural diagram of a viewing and aiming lens according to Embodiment 4 of the present application is shown.

[0123] like Fig.10 As shown, the aiming lens includes, from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8 and a ninth lens L9.

[0124] The first lens L1 has positive refractive power, an object-side surface S1 of which is convex, and an image-side surface S2 of which is concave.

[0125] The second lens L2 has positive refractive power, an object-side surface S4 thereof is convex, and an image-side surface S5 thereof is concave.

[0126] The third lens L3 has negative refractive power, and its object-side surface S5 is convex, and its image-side surface S6 is concave.

[0127] The fourth lens L4 has positive refractive power, and its object-side surface S6 is convex, and its image-side surface S7 is convex.

[0128] The fifth lens L5 has negative refractive power, and its object-side surface S7 is concave and its image-side surface S8 is concave.

[0129] The sixth lens L6 has positive refractive power, and its object-side surface S9 is convex and its image-side surface S10 is convex.

[0130] The seventh lens L7 has positive refractive power, and its object-side surface S11 is convex, and its image-side surface S12 is convex.

[0131] The eighth lens L8 has negative refractive power, and its object-side surface S12 is concave, and its image-side surface S13 is concave.

[0132] The ninth lens L9 has negative refractive power, and its object-side surface S14 is concave, and its image-side surface S15 is concave.

[0133] The second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 may form a four-cemented lens group. The seventh lens L7 and the eighth lens L8 may form a doublet lens group.

[0134] The sighting lens may further include a stop STO, which may be disposed between the first lens L1 and the second lens L2. Optionally, the sighting lens may further include a filter (not shown) having an object side surface and an image side surface and / or a protective glass CG having an object side surface S16 and an image side surface S17. The filter may be used to correct color deviation, and the protective glass CG may be used to protect the image sensor chip located at the imaging surface IMA. Light from the object sequentially passes through each surface S1 to S17 and is finally imaged on the imaging surface IMA.

[0135] Table 4 shows the radius of curvature, thickness / distance, refractive index and Abbe number of each lens of the aiming lens of Example 4, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0136] Table 4

[0137] Fig.11 The relative illumination curve of the aiming lens of Example 4 is shown, which indicates the relative illumination values ​​corresponding to different fields of view. Fig.12 The Ray Fan diagram of the aiming lens of Example 4 is shown, which indicates the aberrations corresponding to different fields of view. Fig.11 and Fig.12 It can be seen that the viewing and aiming lens provided in Example 4 has the characteristics of high illumination and low aberration, and can achieve good imaging quality. Example 5

[0138] The following reference Fig.13 The aiming lens according to Embodiment 5 of the present application is described. Fig.13 A schematic structural diagram of a viewing and aiming lens according to Embodiment 5 of the present application is shown.

[0139] like Fig.13 As shown, the aiming lens includes, from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8 and a ninth lens L9.

[0140] The first lens L1 has positive refractive power, an object-side surface S1 of which is convex, and an image-side surface S2 of which is concave.

[0141] The second lens L2 has positive refractive power, and its object-side surface S4 is convex, and its image-side surface S5 is convex.

[0142] The third lens L3 has negative refractive power, and its object-side surface S5 is concave, and its image-side surface S6 is concave.

[0143] The fourth lens L4 has positive refractive power, and its object-side surface S6 is convex, and its image-side surface S7 is convex.

[0144] The fifth lens L5 has negative refractive power, and its object-side surface S7 is concave and its image-side surface S8 is concave.

[0145] The sixth lens L6 has positive refractive power, and its object-side surface S9 is convex and its image-side surface S10 is convex.

[0146] The seventh lens L7 has positive refractive power, and its object-side surface S11 is convex, and its image-side surface S12 is convex.

[0147] The eighth lens L8 has negative refractive power, and its object-side surface S12 is concave, and its image-side surface S13 is concave.

[0148] The ninth lens L9 has negative refractive power, and its object-side surface S14 is concave, and its image-side surface S15 is concave.

[0149] The second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 may form a four-cemented lens group. The seventh lens L7 and the eighth lens L8 may form a doublet lens group.

[0150] The sighting lens may further include a stop STO, which may be disposed between the first lens L1 and the second lens L2. Optionally, the sighting lens may further include a filter (not shown) having an object side surface and an image side surface and / or a protective glass CG having an object side surface S16 and an image side surface S17. The filter may be used to correct color deviation, and the protective glass CG may be used to protect the image sensor chip located at the imaging surface IMA. Light from the object sequentially passes through each surface S1 to S17 and is finally imaged on the imaging surface IMA.

[0151] Table 5 shows the radius of curvature, thickness / distance, refractive index and Abbe number of each lens of the aiming lens of Example 5, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0152] Table 5

[0153] Fig.14 The relative illumination curve of the aiming lens of Example 5 is shown, which indicates the relative illumination values ​​corresponding to different fields of view. Fig.15 The Ray Fan diagram of the aiming lens of Example 5 is shown, which indicates the aberrations corresponding to different fields of view. Fig.14 and Fig.15 It can be seen that the viewing and aiming lens provided in Example 5 has the characteristics of high illumination and low aberration, and can achieve good imaging quality. Example 6

[0154] The following reference Fig.16 The aiming lens according to Embodiment 6 of the present application is described. Fig.16A schematic structural diagram of a viewing and aiming lens according to Example 6 of the present application is shown.

[0155] like Fig.16 As shown, the aiming lens includes, from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8 and a ninth lens L9.

[0156] The first lens L1 has positive refractive power, an object-side surface S1 of which is convex, and an image-side surface S2 of which is concave.

[0157] The second lens L2 has positive refractive power, and its object-side surface S4 is convex, and its image-side surface S5 is convex.

[0158] The third lens L3 has negative refractive power, and its object-side surface S5 is concave, and its image-side surface S6 is concave.

[0159] The fourth lens L4 has positive refractive power, and its object-side surface S6 is convex, and its image-side surface S7 is convex.

[0160] The fifth lens L5 has negative refractive power, and its object-side surface S7 is concave and its image-side surface S8 is concave.

[0161] The sixth lens L6 has positive refractive power, and its object-side surface S9 is concave, and its image-side surface S10 is convex.

[0162] The seventh lens L7 has positive refractive power, and its object-side surface S11 is convex, and its image-side surface S12 is convex.

[0163] The eighth lens L8 has negative refractive power, and its object-side surface S12 is concave, and its image-side surface S13 is concave.

[0164] The ninth lens L9 has negative refractive power, and its object-side surface S14 is concave, and its image-side surface S15 is convex.

[0165] The second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 may form a four-cemented lens group. The seventh lens L7 and the eighth lens L8 may form a doublet lens group.

[0166] The sighting lens may further include a stop STO, which may be disposed between the first lens L1 and the second lens L2. Optionally, the sighting lens may further include a filter (not shown) having an object side surface and an image side surface and / or a protective glass CG having an object side surface S16 and an image side surface S17. The filter may be used to correct color deviation, and the protective glass CG may be used to protect the image sensor chip located at the imaging surface IMA. Light from the object sequentially passes through each surface S1 to S17 and is finally imaged on the imaging surface IMA.

[0167] Table 6 shows the radius of curvature, thickness / distance, refractive index and Abbe number of each lens of the aiming lens of Example 6, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0168] Table 6

[0169] Fig.17 The relative illumination curve of the aiming lens of Example 6 is shown, which indicates the relative illumination values ​​corresponding to different fields of view. Fig.18 The Ray Fan diagram of the aiming lens of Example 6 is shown, which indicates the aberrations corresponding to different fields of view. Fig.17 and Fig.18 It can be seen that the viewing and aiming lens provided in Example 6 has the characteristics of high illumination and low aberration, and can achieve good imaging quality.

[0170] In summary, Examples 1 to 6 respectively satisfy the relationship shown in Table 7 below.

[0171] Table 7

[0172] The present application also provides an electronic device, which may include a viewing lens according to the above-mentioned embodiment of the present application and an imaging element for converting an optical image formed by the viewing lens into an electrical signal.

[0173] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other to form a technical solution.

Claims

1. A sighting lens, characterized in that: The aiming lens includes, in order from the object side to the image side along the optical axis: a first lens having positive optical power; a second lens having positive optical power; a third lens having negative optical power; a fourth lens having positive refractive power; a fifth lens having negative optical power; a sixth lens having positive refractive power; a seventh lens having positive refractive power; an eighth lens having negative optical power; and a ninth lens having negative optical power; The combined effective focal length Fa of the second lens, the third lens, the fourth lens and the fifth lens and the effective focal length F of the aiming lens satisfy: -1.50≤Fa / F≤-0.

30.

2. The aiming lens according to claim 1, wherein: The object side surface of the first lens is a convex surface; The object side surface of the second lens is a convex surface; The image side surface of the third lens is a concave surface; The object side surface and the image side surface of the fourth lens are both convex surfaces; The object side surface and the image side surface of the fifth lens are both concave surfaces; The image side surface of the sixth lens is a convex surface; The object side surface and the image side surface of the seventh lens are both convex surfaces; The object side surface and the image side surface of the eighth lens are both concave surfaces; and The object side surface of the ninth lens is a concave surface.

3. The aiming lens according to claim 1, wherein: The maximum full aperture Dmax of the aiming and viewing lens and the distance TTL from the object side surface of the first lens to the imaging surface of the aiming and viewing lens on the optical axis satisfy: 0.3≤Dmax / TTL≤0.

55.

4. The aiming lens according to claim 1, wherein: A distance TTL from the object side surface of the first lens to the imaging surface of the aiming and viewing lens on the optical axis and an effective focal length F of the aiming and viewing lens satisfy the following conditions: 1≤TTL / F≤1.

5.

5. The aiming lens according to claim 1, wherein: The back focus BFL of the aiming and viewing lens and the distance TTL from the object side surface of the first lens to the imaging surface of the aiming and viewing lens on the optical axis satisfy the following conditions: 0.15≤BFL / TTL≤0.

4.

6. The aiming and viewing lens according to any one of claims 1 to 5, wherein the aiming and viewing lens satisfies: 0.6≤F1 / F≤1.6, wherein: F1 is the effective focal length of the first lens.

7. The viewing and aiming lens according to any one of claims 1 to 5, wherein the viewing and aiming lens satisfies: 0.4≤F2 / F≤1.3, wherein: F2 is the effective focal length of the second lens.

8. The aiming and viewing lens according to any one of claims 1 to 5, wherein the aiming and viewing lens satisfies: -0.6≤F3 / F≤-0.15, wherein: F3 is the effective focal length of the third lens.

9. The viewing and aiming lens according to any one of claims 1 to 5, wherein the viewing and aiming lens satisfies: 0.15≤F4 / F≤0.50, wherein: F4 is the effective focal length of the fourth lens.

10. The aiming and viewing lens according to any one of claims 1 to 5, wherein the aiming and viewing lens satisfies: -0.35≤F5 / F≤-0.20, wherein: F5 is the effective focal length of the fifth lens.

11. The viewing and aiming lens according to any one of claims 1 to 5, wherein the viewing and aiming lens satisfies: 0.30≤F6 / F≤0.90, wherein: F6 is the effective focal length of the sixth lens.

12. The viewing and aiming lens according to any one of claims 1 to 5, wherein the viewing and aiming lens satisfies: 0.10≤F7 / F≤0.80, wherein: F7 is the effective focal length of the seventh lens.

13. The aiming and viewing lens according to any one of claims 1 to 5, wherein the aiming and viewing lens satisfies: -1.0≤F8 / F≤-0.15, wherein: F8 is the effective focal length of the eighth lens.

14. The aiming and viewing lens according to any one of claims 1 to 5, wherein the aiming and viewing lens satisfies: -1≤F9 / F≤-0.20, wherein: F9 is the effective focal length of the ninth lens.

15. The aiming and viewing lens according to any one of claims 1 to 5, wherein the aiming and viewing lens satisfies: 0.8≤Fb / F≤10.5, wherein: Fb is the combined effective focal length of the seventh lens and the eighth lens.

16. The viewing and aiming lens according to any one of claims 1 to 5, wherein the viewing and aiming lens satisfies: 0.4≤F18 / F≤1.0, wherein: F18 is the combined effective focal length of the first lens to the eighth lens.

17. The viewing and aiming lens according to any one of claims 1 to 5, wherein the viewing and aiming lens satisfies: -1.5≤F18 / F9≤-0.6, wherein: F18 is the combined effective focal length of the first lens to the eighth lens, and F9 is the effective focal length of the ninth lens.

18. The aiming and viewing lens according to any one of claims 1 to 5, wherein the aiming and viewing lens satisfies at least one of the following conditions: 1.7≤ND1≤2.2, 45≤VD2≤100, 45≤VD4≤100, in, ND1 is the refractive index of the first lens, VD2 is the Abbe number of the second lens, and VD4 is the Abbe number of the fourth lens.

19. The aiming and viewing lens according to claim 1, wherein the aiming and viewing lens satisfies at least one of the following conditions: 0.40≤Dmax / TTL≤0.5, 1.05≤TTL / F≤1.25, 0.18≤BFL / TTL≤0.32, 0.8≤F1 / F≤1.4, 0.6≤F2 / F≤1, -0.5≤F3 / F≤-0.2, 0.2≤F4 / F≤0.4, -0.3≤F5 / F≤-0.25, 0.4≤F6 / F≤0.75, 0.2≤F7 / F≤0.62, -0.9≤F8 / F≤-0.2, -0.85≤F9 / F≤-0.45, -1.22≤Fa / F≤-0.5, 1≤Fb / F≤10.2, 0.6≤F18 / F≤0.75, -1.3≤F18 / F9≤-0.8, 1.8≤ND1≤2.2, 60≤VD2≤100, 60≤VD4≤100, in, Dmax is the maximum full aperture of the viewing and aiming lens, TTL is the distance from the object side surface of the first lens to the imaging surface of the viewing and aiming lens on the optical axis, BFL is the back focus of the viewing and aiming lens, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, F7 is the effective focal length of the seventh lens, F8 is the effective focal length of the eighth lens, F9 is the effective focal length of the ninth lens, Fb is the combined effective focal length of the seventh lens and the eighth lens, F18 is the combined effective focal length of the first lens to the eighth lens, ND1 is the refractive index of the first lens, VD2 is the Abbe number of the second lens, and VD4 is the Abbe number of the fourth lens.

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