Observing and aiming lens

Abstract

The invention relates to an observing and aiming lens which is arranged along an optical axis in a direction from an object side to an image side. The 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, a seventh lens with positive focal power, an eighth lens with negative focal power and a ninth lens with positive focal power. The effective focal length F6 of the sixth lens and the effective focal length F of the observing and aiming lens meet the following relation: 0.2 < = F6 / F < = 2.0; the effective focal length F7 of the seventh lens and the effective focal length F of the observing and aiming lens meet the following relation: 0.09 < = F7 / F < = 0.30. The observing and aiming lens at least has the advantages of ultra-long focal length, miniaturization, wide spectrum (430-940 nm), high resolution, low chromatic aberration, good thermal stability (-30-70 DEG C), full-field illumination greater than or equal to 99%, and incident angle CRAlt of main light of the lens; 1.0 degree and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging lenses, and in particular to a sighting lens. Background Art

[0002] With the continuous advancement of optical technology, the manufacturing process and optical theory of optical lenses have been significantly developed. This laid the foundation for the birth of sighting lenses. Sighting lenses are also called sighting lenses and sniper lenses, which allow users to see the target more clearly.

[0003] The sighting lens needs to be used in various complex environmental conditions, so the adaptive technology for different environments is also constantly developing, which also puts higher requirements on the sighting lens. First of all, 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; secondly, the sighting lens is used to observe the details of the object, and the object side field of view is small, so the lens needs to have a longer focal length; thirdly, in order to meet the need to distinguish tiny details, the sighting lens is required to have high image quality and low ghosting; fourthly, in order to meet the dim scene lens 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. At the same time, in order to cope with severe weather conditions such as fog, rain, snow, etc., waterproof, anti-fog and impact-resistant technologies are also applied to the design and manufacture of the sighting lens to ensure that it can maintain stable performance in various complex environments and provide users with clear and accurate target observation.

[0004] The sighting lenses on the market today still have the following shortcomings:

[0005] 1. It is difficult for the sighting lens in the prior art to take into account both the lens aperture and high image quality;

[0006] 2. It is difficult for the sighting lens in the prior art to achieve both long focal length and shorter overall optical length;

[0007] 3. The sighting lens in the prior art uses a narrow band to achieve high resolution in a wide spectrum of 430nm to 940nm;

[0008] 4. The existing sighting lens has little room for optimizing ghost images, and it is difficult to achieve high image quality.

[0009] Therefore, designing a sighting lens with one of the characteristics of ultra-telephoto, miniaturization, wide spectrum, and high resolution has become a market development trend. Summary of the invention

[0010] In order to solve the above problems in the prior art, the present invention aims to provide a sighting lens having at least one of the characteristics of ultra-telephoto, miniaturization, wide spectrum, and high resolution.

[0011] To achieve the above-mentioned object, the present invention provides a sighting lens, which comprises, in order from the object side to the image side along the optical axis:

[0012] 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 positive optical power, a fifth lens with negative optical power, a sixth lens with positive optical power, a seventh lens with positive optical power, an eighth lens with negative optical power and a ninth lens with positive optical power;

[0013] The effective focal length F6 of the sixth lens and the effective focal length F of the aiming lens satisfy the following relationship: 0.2≤F6 / F≤2.0;

[0014] The effective focal length F7 of the seventh lens and the effective focal length F of the aiming lens satisfy the following relationship: 0.09≤F7 / F≤0.30.

[0015] According to a technical solution of the present invention, the first lens is a convexo-concave lens, the second lens is a convexo-concave lens, the third lens is a convexo-concave lens, the object side surface of the fourth lens is a convex surface, and the image side surface of the fifth lens is a concave surface.

[0016] According to a technical solution of the present invention, the image side surface of the seventh lens is a convex surface, the eighth lens is a concave-concave lens, and the object side surface of the ninth lens is a convex surface.

[0017] According to a technical solution of the present invention, the third lens, the fourth lens and the fifth lens form a triplet lens, or

[0018] The third lens, the fourth lens, the fifth lens and the sixth lens form a four-cemented lens.

[0019] According to a technical solution of the present invention, the combined focal length Fa of the triplet lens or the quadruplet lens and the effective focal length F of the aiming lens satisfy the following relationship: -1.69≤Fa / F≤-0.14.

[0020] According to a technical solution of the present invention, the seventh lens and the eighth lens form a doublet lens.

[0021] According to a technical solution of the present invention, the combined focal length Fb of the double cemented lens and the effective focal length F of the aiming lens satisfy the following relationship: -0.30≤Fb / F≤-0.09.

[0022] According to a technical solution of the present invention, the effective focal length F1 of the first lens and the effective focal length F of the aiming lens satisfy the following relationship: 0.6≤F1 / F≤1.5.

[0023] According to a technical solution of the present invention, the effective focal length F2 of the second lens and the effective focal length F of the aiming lens satisfy the following relationship: 0.4≤F2 / F≤1.1.

[0024] According to a technical solution of the present invention, the effective focal length F3 of the third lens and the effective focal length F of the aiming lens satisfy the following relationship: -0.7≤F3 / F≤-0.2.

[0025] According to a technical solution of the present invention, the effective focal length F4 of the fourth lens and the effective focal length F of the aiming lens satisfy the following relationship: 0.18≤F4 / F≤0.50.

[0026] According to a technical solution of the present invention, the effective focal length F5 of the fifth lens and the effective focal length F of the aiming lens satisfy the following relationship: -0.4≤F5 / F≤-0.1.

[0027] According to a technical solution of the present invention, the effective focal length F8 of the eighth lens and the effective focal length F of the aiming lens satisfy the following relationship: -0.15≤F8 / F≤-0.02.

[0028] According to a technical solution of the present invention, the combined effective focal length F16 of the first lens to the sixth lens and the effective focal length F of the aiming lens satisfy the following relationship: 0.4≤F16 / F≤0.7.

[0029] According to a technical solution of the present invention, the refractive index ND1 of the first lens satisfies the following relationship: 1.85≤ND1≤1.98.

[0030] According to a technical solution of the present invention, the Abbe number VD4 of the fourth lens satisfies the following relationship: 60≤VD4≤100.

[0031] According to a technical solution of the present invention, the effective focal length F of the aiming and viewing lens and the entrance pupil diameter ENPD satisfy the following relationship: 2.9≤F / ENPD≤3.1.

[0032] According to a technical solution of the present invention, the maximum full aperture Dmax of the aiming and viewing lens and the total optical length TTL satisfy the following relationship: 0.39≤Dmax / TTL≤0.50.

[0033] According to a technical solution of the present invention, the total optical length TTL and the back focal length BFL of the aiming and viewing lens satisfy the following relationship: 0.1≤BFL / TTL≤0.3.

[0034] According to a technical solution of the present invention, a curvature radius R32 of the image side surface of the third lens and a curvature radius R52 of the image side surface of the fifth lens satisfy the following relationship: 0.12≤R32 / R52≤1.2.

[0035] According to a technical solution of the present invention, the aiming lens satisfies at least one of the following conditions:

[0036] 0.68≤F1 / F≤1.33,

[0037] -0.55≤F3 / F≤-0.22,

[0038] 0.20≤F4 / F≤0.41,

[0039] 0.49≤F16 / F≤0.68,

[0040] 75.46≤VD4≤94.36,

[0041] 0.16≤BFL / TTL≤0.30,

[0042] Among them, TTL is the total optical length of the viewing and aiming lens, F is the effective focal length of the viewing and aiming lens, BFL is the back focal length of the viewing and aiming lens, F1 is the effective focal length of the first lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F16 is the combined effective focal length of the first lens to the sixth lens, and VD4 is the Abbe number of the fourth lens.

[0043] According to the solution of the present invention, the viewing and aiming lens is provided to include nine lenses, and the optical powers of the first lens to the eighth lens are respectively set to be positive power, positive power, negative power, positive power, negative power, positive power, positive power, negative power, positive power, positive power, negative power, and positive power. At the same time, the ratio of the effective focal length of the seventh lens to the viewing and aiming lens is reasonably configured, so that the viewing and aiming lens of the present invention has at least one of the characteristics of super telephoto, miniaturization, wide spectrum (430nm~940nm), high resolution, low chromatic aberration, good thermal stability (-30~70℃), full field illumination ≥99%, and lens chief ray incident angle CRA<1.0°. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0045] Figure 1Schematic diagram of the structure of the aiming and viewing lens of the first embodiment of the present invention;

[0046] Figure 2 is a relative illumination diagram of the aiming and viewing lens of Example 1 of the present invention;

[0047] Figure 3 This is a transverse light fan diagram of the aiming lens of the first embodiment of the present invention;

[0048] Figure 4 Schematic diagram of the structure of the aiming and viewing lens of the second embodiment of the present invention;

[0049] Figure 5 is a relative illumination diagram of the aiming and viewing lens of Example 2 of the present invention;

[0050] Figure 6 This is a transverse light fan diagram of the aiming lens of the second embodiment of the present invention;

[0051] Figure 7 Schematic diagram of the structure of the aiming and viewing lens of the third embodiment of the present invention;

[0052] Figure 8 is a relative illumination diagram of the aiming and viewing lens of Example 3 of the present invention;

[0053] Fig. 9 This is a transverse light fan diagram of the aiming and viewing lens of Example 3 of the present invention;

[0054] Fig.10 Schematic diagram of the structure of the aiming and viewing lens of the fourth embodiment of the present invention;

[0055] Fig.11 is a relative illumination diagram of the aiming and viewing lens of the fourth embodiment of the present invention;

[0056] Fig.12 This is a transverse light fan diagram of the aiming lens of the fourth embodiment of the present invention;

[0057] Fig.13 Schematic diagram of the structure of the aiming and viewing lens of Embodiment 5 of the present invention;

[0058] Fig.14 is a relative illumination diagram of the aiming and viewing lens of Example 5 of the present invention;

[0059] Fig.15 FIG. 1 is a lateral light fan diagram of the aiming lens of Example 5 of the present invention. DETAILED DESCRIPTION

[0060] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to limit the scope of the present 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.

[0061] 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 first lens.

[0062] 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.

[0063] In this article, the paraxial region refers to the region 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 region; 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 region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0064] 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.

[0065] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as those 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 the same meaning as 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.

[0066] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following examples only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for those of ordinary skill in the art, without departing from the concept of the present application, several variations and improvements can also be made, which all belong to the protection scope of the present application.

[0067] like Figures 1 to 15 As shown, an embodiment of the present invention provides a viewing lens, which includes, in order from the object side to the image side of 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, a ninth lens L9 and a protective plate glass CG, wherein the first lens L1 to the ninth lens L9 are all spherical lenses.

[0068] The first lens L1 has positive focal power, the object side is convex, and the image side is concave. The first lens L1 has positive focal power, which is conducive to collecting light, so that the light emitted by the first lens L1 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 L1 is concave, which helps to reduce the incident angle of the axial light on the image side of the first lens L1, reduce the spherical aberration generated by the image side of the first lens L1, and is conducive to achieving high image quality.

[0069] Optionally, the first lens L1 is made of a material with a relatively large refractive index, which can reduce the surface curvature and the generation of aberrations, thereby facilitating the realization of high image quality.

[0070] The second lens L2 has positive focal power, a convex object side surface and a concave image side surface, which can reduce the incident angle of the axial light on the image side surface of the second lens L2, thereby reducing the spherical aberration generated by the image side surface of the second lens L2, which is conducive to achieving high image quality. The second lens L2 can be used with lower dispersion materials to reduce the generation of chromatic aberration, reduce the difficulty of system correction, and is conducive to achieving high image quality.

[0071] In some embodiments of the present invention, the third lens L3, the fourth lens L4 and the fifth lens L5 form a triplet lens, or

[0072] The third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 form a quadruple lens.

[0073] The third lens L3 has negative power, the object side is convex, and the image side is concave, which is conducive to reducing the incident angle of the axial light on the object side of the third lens L3, thereby reducing the spherical aberration generated by the object side of the third lens L3, which is conducive to achieving high image quality. The third lens L3 has negative power in the cemented lens, and cooperates with the fourth lens L4 to achieve achromatic aberration, which is conducive to achieving high image quality.

[0074] The fourth lens L4 has positive focal power, and the object side is convex. The fourth lens L4 shares the focal power, which can reduce the surface curvature and reduce the generation of aberrations, which is conducive to achieving high image quality. The fourth lens L4 has positive focal power in the cemented lens, and can be preferably matched with low-dispersion materials to perform apochromatism on the system, which is conducive to achieving infrared confocality and high and low temperature correction; the fourth lens L4 can also compensate for the axial chromatic aberration generated by the first lens L1, which is conducive to wide-spectrum chromatic aberration correction and achieving higher image quality.

[0075] The fifth lens L5 has negative optical power, and the image side surface is concave. The fifth lens L5 shares the optical power, which can reduce the surface curvature and reduce the generation of aberrations, which is conducive to achieving high image quality. The fifth lens L5 has negative optical power in the cemented lens, and cooperates with the fourth lens L4 to achieve apochromatism, which is conducive to achieving high image quality. Optionally, the third lens L3, the fourth lens L4 and the fifth lens L5 form a triple cemented lens, and the focal length value of the triple cemented lens is negative, which produces negative spherical aberration, compensates for the positive spherical aberration introduced by the first lens L1 and the second lens L2, and is conducive to achieving high image quality.

[0076] The sixth lens L6 has positive focal power, which can reduce the incident angle of the axial light on the image side of the sixth lens L6, reduce the spherical aberration generated by the image side of the sixth lens L6, and help achieve high image quality. Optionally, the sixth lens L6 can be matched with low dispersion materials to form a four-cemented lens with the third lens L3, the fourth lens L4, and the fifth lens L5. The focal length of the four-cemented lens is negative, which generates negative spherical aberration and compensates for the positive spherical aberration introduced by the first lens L1 and the second lens L2, which is conducive to achieving high image quality and reducing the sensitivity of system tolerance.

[0077] In some embodiments of the present invention, the combined focal length Fa of the triplet or quadruplet lens and the effective focal length F of the sighting lens satisfy the following relationship: -1.69≤Fa / F≤-0.14. By reasonably allocating the focal length values ​​of the triplet or quadruplet lens, the cemented lens group can compensate for the axial chromatic aberration produced by the first lens L1, which is beneficial to achieving infrared confocality; at the same time, the focal length value of the cemented lens is made negative, generating negative spherical aberration, which can compensate for the positive spherical aberration introduced by the first lens L1 and the second lens L2, which is beneficial to achieving high image quality.

[0078] In some embodiments of the present invention, the seventh lens L7 and the eighth lens L8 form a doublet lens.

[0079] The seventh lens L7 has positive refractive power, the image side surface is convex, and the object side surface can be convex or concave. The seventh lens L7 and the eighth lens L8 are combined into a doublet lens, which can correct the remaining off-axis chromatic aberration of the system and is conducive to achieving high image quality.

[0080] The eighth lens L8 has negative power, its object side surface is concave, and its image side surface is concave. The eighth lens L8 has negative power in the doublet lens, and cooperates with the seventh lens L7 to achieve apochromatism, which is conducive to achieving high image quality.

[0081] In some embodiments of the present invention, the combined focal length Fb of the doublet lens and the effective focal length F of the sighting lens satisfy the following relationship: -0.30≤Fb / F≤-0.09. By reasonably allocating the focal length value of the doublet lens group composed of the seventh lens L7 and the eighth lens L8, the off-axis residual chromatic aberration can be corrected, which is conducive to achieving high image quality.

[0082] The ninth lens L9 has positive power, the object side is convex, and the image side can be concave or flat. The ninth lens can be made of a material with low dispersion, which can correct the residual chromatic aberration of the system and is conducive to achieving high image quality.

[0083] The first lens L1 to the sixth lens L6 as a whole form a telephoto structure with the rear group, which reduces the total optical length and is conducive to miniaturization.

[0084] In some embodiments of the present invention, the effective focal length F1 of the first lens L1 and the effective focal length F of the aiming lens satisfy the following relationship: 0.6≤F1 / F≤1.5, preferably, 0.68≤F1 / F≤1.33; by reasonably allocating the focal length value of the first lens L1, light can be collected by the first lens L1, so that the light emitted by the first lens L1 is close to the optical axis direction, which is conducive to reducing the aperture of the rear lens and achieving miniaturization.

[0085] In some embodiments of the present invention, the effective focal length F2 of the second lens L2 and the effective focal length F of the aiming lens satisfy the following relationship: 0.4≤F2 / F≤1.1; by reasonably allocating the focal length value of the second lens L2 and matching it with low-dispersion materials, the generation of chromatic aberration can be reduced, the difficulty of system correction can be reduced, and high image quality can be achieved.

[0086] In some embodiments of the present invention, the effective focal length F3 of the third lens L3 and the effective focal length F of the aiming lens satisfy the following relationship: -0.7≤F3 / F≤-0.2, preferably, -0.55≤F3 / F≤-0.22; by reasonably allocating the focal length value of the third lens L3, the third lens L3 has a negative focal power in the triplet or quadruplet lens, and cooperates with the fourth lens L4 to achieve apochromatism, which is conducive to achieving high image quality.

[0087] In some embodiments of the present invention, the effective focal length F4 of the fourth lens L4 and the effective focal length F of the aiming lens satisfy the following relationship: 0.18≤F4 / F≤0.50, preferably, 0.20≤F4 / F≤0.41; by reasonably allocating the focal length value of the fourth lens L4, the fourth lens L4 has a positive focal power in the triplet or quadruplet lens, and is matched with low dispersion materials to perform apochromatization on the system, which is conducive to achieving infrared confocality.

[0088] In some embodiments of the present invention, the effective focal length F5 of the fifth lens L5 and the effective focal length F of the aiming lens satisfy the following relationship: -0.4≤F5 / F≤-0.1; by reasonably allocating the focal length value of the fifth lens L5, the fifth lens L5 has a negative optical power in the triplet or quadruplet lens, and cooperates with the fourth lens L4 to achieve apochromatism, which is conducive to achieving high image quality.

[0089] In some embodiments of the present invention, the effective focal length F6 of the sixth lens L6 and the effective focal length F of the aiming lens satisfy the following relationship: 0.2≤F6 / F≤2.0; by reasonably allocating the focal length value of the sixth lens L6, the sixth lens L6 has a positive focal power in the four-cemented lens, and is matched with low-dispersion materials to perform apochromatization on the system, which is conducive to achieving infrared confocality.

[0090] In some embodiments of the present invention, the effective focal length F7 of the seventh lens L7 and the effective focal length F of the aiming lens satisfy the following relationship: 0.09≤F7 / F≤0.30; by reasonably allocating the focal length value of the seventh lens L7, the seventh lens L7 has a positive focal power in the doublet lens, and is matched with a low-dispersion material to perform apochromatization on the system, which is conducive to achieving infrared confocality.

[0091] In some embodiments of the present invention, the effective focal length F8 of the eighth lens L8 and the effective focal length F of the aiming lens satisfy the following relationship: -0.15≤F8 / F≤-0.02; the eighth lens L8 has negative power in the doublet lens, and cooperates with the seventh lens L7 to achieve apochromatism, which is conducive to achieving high image quality.

[0092] In some embodiments of the present invention, the combined effective focal length F16 of the first lens L1 to the sixth lens L6 and the effective focal length F of the aiming lens satisfy the following relationship: 0.4≤F16 / F≤0.7, preferably, 0.49≤F16 / F≤0.68. By reasonably allocating the combined effective focal length of the first lens L1 to the sixth lens L6, so that they and the rear group form a telephoto architecture, it is beneficial to reduce the total optical length and achieve miniaturization.

[0093] In some embodiments of the present invention, the refractive index ND1 of the first lens L1 satisfies the following relationship: 1.85≤ND1≤1.98; by reasonably setting the refractive index of the first lens L1, the first lens L1 can preferably be made of a material with a larger refractive index, thereby reducing the surface curvature and the generation of aberrations, which is conducive to achieving high image quality.

[0094] In some embodiments of the present invention, the Abbe number VD4 of the fourth lens L4 satisfies the following relationship: 60≤VD4≤100, preferably, 75.46≤VD4≤94.36; by reasonably setting the Abbe number of the fourth lens L4, the fourth lens L4 can preferably be made of a material with a larger Abbe number, which is beneficial to the correction of chromatic aberration and high and low temperatures, and achieves no defocus in the temperature range of -30 to 70°C, while reducing the infrared defocus amount and improving the resolution of visible light and infrared light.

[0095] In some embodiments of the present invention, the effective focal length F of the aiming lens and the entrance pupil diameter ENPD satisfy the following relationship: 2.9≤F / ENPD≤3.1; by controlling the size of the system entrance pupil diameter, the system has a smaller aperture value, which is conducive to achieving a large aperture.

[0096] In some embodiments of the present invention, the maximum full aperture Dmax of the sighting lens and the total optical length TTL satisfy the following relationship: 0.39≤Dmax / TTL≤0.50; under a certain total optical length of the system, 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.

[0097] In some embodiments of the present invention, the total optical length TTL and the back focal length BFL of the aiming and viewing lens satisfy the following relationship: 0.1≤BFL / TTL≤0.3, preferably, 0.16≤BFL / TTL≤0.30; on the basis of achieving miniaturization, by controlling the optical back focal length of the system, it is beneficial to take into account cameras with different interfaces, improve the versatility of the lens, and also help to reserve space for the installation of optical components.

[0098] In some embodiments of the present invention, a curvature radius R32 of the image side surface of the third lens L3 and a curvature radius R52 of the image side surface of the fifth lens L5 satisfy the following relationship: 0.12≤R32 / R52≤1.2; by reasonably controlling the curvature radii of the image side surface of the third lens L3 and the image side surface of the fifth lens L5, it is beneficial to smooth the incident light and reduce the risk of strong energy ghost images caused by off-axis edge light.

[0099] Five groups of specific embodiments are given below according to the above configuration of the present invention to specifically illustrate the viewing and aiming lens according to the present invention. The viewing and aiming lens according to the present invention has a total of nine lenses, each cemented surface of the cemented lens is recorded as a surface, plus the protective glass CG and the image surface IMA, a total of 17 or 18 surfaces. Among them, the aperture STO is set between the first lens L1 and the second lens L2.

[0100] The data of five groups of embodiments are shown in Table 1 below:

[0101] Conditional expression Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Embodiment 5 0.6≤F1 / F≤1.5 1.271 0.811 0.837 0.907 0.734 0.4≤F2 / F≤1.1 0.671 0.540 0.534 0.848 0.712 -0.7≤F3 / F≤-0.2 -0.500 -0.301 -0.273 -0.398 -0.343 0.18≤F4 / F≤0.50 0.298 0.282 0.238 0.333 0.271 -0.4≤F5 / F≤-0.1 -0.283 -0.228 -0.170 -0.204 -0.343 0.2≤F6 / F≤2.0 0.775 0.547 0.358 0.298 1.932 0.09≤F7 / F≤0.30 0.215 0.143 0.151 0.194 0.187 -0.15≤F8 / F≤-0.02 -0.083 -0.072 -0.091 -0.098 -0.083 -1.69≤Fa / F≤-0.14 -0.510 -0.245 -0.193 -0.853 -0.507 -0.30≤Fb / F≤-0.09 -0.142 -0.164 -0.246 -0.200 -0.151 0.4≤F16 / F≤0.7 0.548 0.617 0.625 0.582 0.591 1.85≤ND1≤1.98 1.923 1.923 1.923 1.923 1.923 60≤VD4≤100 75.510 81.610 75.510 81.610 94.520 2.9≤F / ENPD≤3.1 3.000 3.000 3.000 3.000 3.000 0.39≤Dmax / TTL≤0.50 0.440 0.440 0.440 0.441 0.445 0.1≤BFL / TTL≤0.3 0.220 0.250 0.221 0.220 0.218 0.12≤R32 / R52≤1.2 0.664 0.671 0.900 1.009 0.176

[0102] Table 1

[0103] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0104] Embodiment 1

[0105] Figure 1 Schematic diagram of the structure of the aiming and viewing lens of the first embodiment of the present invention;

[0106] Figure 2 is a relative illumination diagram of the aiming and viewing lens of Example 1 of the present invention;

[0107] Figure 3 FIG. 1 is a lateral light fan diagram of the aiming lens of the first embodiment of the present invention.

[0108] In Embodiment 1, the first lens L1 is a convexo-concave lens with positive power, the second lens L2 is a convexo-concave lens with positive power, the third lens L3 is a convexo-concave lens with negative power, the fourth lens L4 is a convexo-convex lens with positive power, the fifth lens L5 is a concave-concave lens with negative power, the sixth lens L6 is a convexo-concave lens with positive power, the seventh lens L7 is a convexo-convex lens with positive power, the eighth lens L8 is a concave-concave lens with negative power, and the ninth lens L9 is a convex-planar lens with positive power.

[0109] The first lens L1 to the ninth lens L9 are all spherical lenses; the aperture STO is disposed between the first lens L1 and the second lens L2.

[0110] The third lens L3, the fourth lens L4 and the fifth lens L5 form a triplet lens; the seventh lens L7 and the eighth lens L8 form a doublet lens.

[0111] Table 2 lists the relevant parameters of each lens in the sighting lens of this embodiment, including: surface type, curvature radius R, thickness d, refractive index Nd and Abbe number Vd of the material.

[0112] Surface serial number Surface type Curvature radius R Thickness d Refractive index Nd Abbe number Vd S1 Spherical 163.892 4.387 1.923 20.9 S2 Spherical 535.010 4.000 STO Aperture Infinity -3.900 S3 Spherical 65.638 9.998 1.593 68.3 S4 Spherical 365.967 0.970 S5 Spherical 72.149 2.503 1.750 35.0 S6 Spherical 36.138 14.315 1.550 75.5 S7 Spherical -283.118 2.000 1.805 25.5 S8 Spherical 54.389 11.039 S9 Spherical 39.131 4.124 1.870 20.0 S10 Spherical 52.393 39.699 S11 Spherical 121.874 3.363 1.785 25.7 S12 Spherical -46.106 2.000 1.954 32.3 S13 Spherical 24.639 19.329 S14 Spherical 36.485 3.172 1.673 32.2 S15 Spherical Infinity 30.999 S16 Spherical Infinity 1.500 1.517 64.2 S17 Spherical Infinity 0.500 IMA Image plane Infinity - -

[0113] Table 2

[0114] Combination Figures 1 to 3 As shown in Tables 1 and 2 above, in Example 1, the absolute value of the distortion of the sighting lens is 0.01%, the half field angle is 1.18°, the half image height is 4.08, and the total optical length TTL is 150 mm.

[0115] The first embodiment of the present invention is a sighting lens having at least one of the following characteristics: ultra-telephoto, miniaturization, wide spectrum (430nm-940nm), high resolution, low chromatic aberration, good thermal stability (-30-70°C), full field illumination ≥99%, and lens chief ray incident angle CRA<1.0°.

[0116] Embodiment 2

[0117] Figure 4 Schematic diagram of the structure of the aiming and viewing lens of the second embodiment of the present invention;

[0118] Figure 5 is a relative illumination diagram of the aiming and viewing lens of Example 2 of the present invention;

[0119] Figure 6 This is a lateral light fan diagram of the aiming lens of Example 2 of the present invention.

[0120] In the second embodiment, the first lens L1 is a convexo-concave lens with positive power, the second lens L2 is a convexo-concave lens with positive power, the third lens L3 is a convexo-concave lens with negative power, the fourth lens L4 is a convexo-convex lens with positive power, the fifth lens L5 is a convexo-concave lens with negative power, the sixth lens L6 is a convexo-concave lens with positive power, the seventh lens L7 is a convexo-convex lens with positive power, the eighth lens L8 is a convexo-concave lens with negative power, and the ninth lens L9 is a convexo-concave lens with positive power.

[0121] The first lens L1 to the ninth lens L9 are all spherical lenses; the aperture STO is disposed between the first lens L1 and the second lens L2.

[0122] The third lens L3, the fourth lens L4 and the fifth lens L5 form a triplet lens; the seventh lens L7 and the eighth lens L8 form a doublet lens.

[0123] Table 3 lists the relevant parameters of each lens in the observation and aiming lens of this embodiment, including: surface type, curvature radius R, thickness d, refractive index Nd and Abbe number Vd of the material.

[0124] Surface serial number Surface type Curvature radius R Thickness d Refractive index Nd Abbe number Vd S1 Spherical 120.540 5.718 1.923 20.9 S2 Spherical 603.896 4.000 STO Aperture Infinity -3.900 S3 Spherical 49.463 11.160 1.589 61.3 S4 Spherical 208.291 0.100 S5 Spherical 101.842 2.039 1.801 35.0 S6 Spherical 32.387 15.140 1.497 81.6 S7 Spherical -165.291 5.790 1.808 22.7 S8 Spherical 48.289 3.788 S9 Spherical 42.632 5.073 1.923 20.9 S10 Spherical 69.551 40.296 S11 Spherical 112.370 4.165 1.847 23.8 S12 Spherical -30.255 3.706 1.954 32.3 S13 Spherical 26.756 12.232 S14 Spherical 36.102 3.125 1.673 32.2 S15 Spherical 607.552 35.566 S16 Spherical Infinity 1.500 1.517 64.2 S17 Spherical Infinity 0.500 IMA Image plane Infinity - -

[0125] Table 3

[0126] Combination Figures 4 to 6 As shown in Table 1 and Table 3, in Example 2, the absolute value of the distortion of the sighting lens is 0.05%, the half field angle is 1.18°, the half image height is 4.08, and the total optical length TTL is 150 mm.

[0127] The second embodiment of the present invention is a sighting lens having at least one of the following characteristics: ultra-telephoto, miniaturization, wide spectrum (430nm-940nm), high resolution, low chromatic aberration, good thermal stability (-30-70°C), full field illumination ≥99%, and lens chief ray incident angle CRA<1.0°.

[0128] Embodiment 3

[0129] Figure 7 Schematic diagram of the structure of the aiming and viewing lens of the third embodiment of the present invention;

[0130] Figure 8 is a relative illumination diagram of the aiming and viewing lens of Example 3 of the present invention;

[0131] Fig. 9 This is a transverse light fan diagram of the aiming lens of Example 3 of the present invention.

[0132] In embodiment 3, the first lens L1 is a convexo-concave lens with positive power, the second lens L2 is a convexo-concave lens with positive power, the third lens L3 is a convexo-concave lens with negative power, the fourth lens L4 is a convexo-convex lens with positive power, the fifth lens L5 is a convexo-concave lens with negative power, the sixth lens L6 is a convexo-concave lens with positive power, the seventh lens L7 is a convexo-convex lens with positive power, the eighth lens L8 is a convexo-concave lens with negative power, and the ninth lens L9 is a convexo-concave lens with positive power.

[0133] The first lens L1 to the ninth lens L9 are all spherical lenses; the aperture STO is disposed between the first lens L1 and the second lens L2.

[0134] The third lens L3, the fourth lens L4 and the fifth lens L5 form a triplet lens; the seventh lens L7 and the eighth lens L8 form a doublet lens.

[0135] Table 4 lists the relevant parameters of each lens in the sighting lens of this embodiment, including: surface type, curvature radius R, thickness d, refractive index Nd and Abbe number Vd of the material.

[0136]

[0137]

[0138] Table 4

[0139] Combination Figures 7 to 9 As shown in Table 1 and Table 4, in Example 3, the absolute value of the distortion of the sighting lens is 0.07%, the half field angle is 1.18°, the half image height is 4.08, and the total optical length TTL is 150 mm.

[0140] The third embodiment of the present invention is a sighting lens having at least one of the following characteristics: ultra-telephoto, miniaturization, wide spectrum (430nm-940nm), high resolution, low chromatic aberration, good thermal stability (-30-70°C), full field of view illumination ≥99%, and lens chief ray incident angle CRA<1.0°.

[0141] Embodiment 4

[0142] Fig.10 Schematic diagram of the structure of the aiming and viewing lens of the fourth embodiment of the present invention;

[0143] Fig.11 is a relative illumination diagram of the aiming and viewing lens of the fourth embodiment of the present invention;

[0144] Fig.12 This is a transverse light fan diagram of the aiming lens of the fourth embodiment of the present invention.

[0145] In embodiment 4, the first lens L1 is a convexo-concave lens with positive power, the second lens L2 is a convexo-concave lens with positive power, the third lens L3 is a convexo-concave lens with negative power, the fourth lens L4 is a convexo-concave lens with positive power, the fifth lens L5 is a convexo-concave lens with negative power, the sixth lens L6 is a convexo-concave lens with positive power, the seventh lens L7 is a convexo-convex lens with positive power, the eighth lens L8 is a convexo-concave lens with negative power, and the ninth lens L9 is a convex-planar lens with positive power.

[0146] The first lens L1 to the ninth lens L9 are all spherical lenses; the aperture STO is disposed between the first lens L1 and the second lens L2.

[0147] The third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 form a four-cemented lens; the seventh lens L7 and the eighth lens L8 form a doublet lens.

[0148] Table 5 lists the relevant parameters of each lens in the viewing and aiming lens of this embodiment, including: surface type, curvature radius R, thickness d, refractive index Nd and Abbe number Vd of the material.

[0149]

[0150]

[0151] Table 5

[0152] Combination Figures 10 to 12 As shown in Table 1 and Table 5, in Example 4, the absolute value of the distortion of the aiming and viewing lens is 0.06%, the half field angle is 1.18°, the half image height is 4.08, and the total optical length TTL is 150 mm.

[0153] The fourth embodiment of the present invention is a sighting lens having at least one of the following characteristics: ultra-telephoto, miniaturization, wide spectrum (430nm-940nm), high resolution, low chromatic aberration, good thermal stability (-30-70°C), full field illumination ≥99%, and lens chief ray incident angle CRA<1.0°.

[0154] Embodiment 5

[0155] Fig.13 Schematic diagram of the structure of the aiming and viewing lens of Embodiment 5 of the present invention;

[0156] Fig.14 is a relative illumination diagram of the aiming and viewing lens of Example 5 of the present invention;

[0157] Fig.15 FIG. 1 is a lateral light fan diagram of the aiming lens of Example 5 of the present invention.

[0158] In embodiment 5, the first lens L1 is a convexo-concave lens with positive power, the second lens L2 is a convexo-concave lens with positive power, the third lens L3 is a convexo-concave lens with negative power, the fourth lens L4 is a convexo-convex lens with positive power, the fifth lens L5 is a convexo-concave lens with negative power, the sixth lens L6 is a convexo-concave lens with positive power, the seventh lens L7 is a convexo-concave lens with positive power, the eighth lens L8 is a convexo-concave lens with negative power, and the ninth lens L9 is a convexo-concave lens with positive power.

[0159] The first lens L1 to the ninth lens L9 are all spherical lenses; the aperture STO is disposed between the first lens L1 and the second lens L2.

[0160] The third lens L3, the fourth lens L4 and the fifth lens L5 form a triplet lens; the seventh lens L7 and the eighth lens L8 form a doublet lens.

[0161] Table 6 lists the relevant parameters of each lens in the sighting lens of this embodiment, including: surface type, curvature radius R, thickness d, refractive index Nd and Abbe number Vd of the material.

[0162] Surface serial number Surface type Curvature radius R Thickness d Refractive index Nd Abbe number Vd S1 Spherical 72.615 6.630 1.923 20.9 S2 Spherical 152.174 4.666 STO Aperture Infinity 0.100 S3 Spherical 60.560 8.069 1.613 44.1 S4 Spherical 190.575 0.100 S5 Spherical 88.739 2.000 1.728 28.3 S6 Spherical 31.467 17.935 1.438 94.5 S7 Spherical -79.162 2.000 1.805 25.5 S8 Spherical 178.574 4.793 S9 Spherical -113.958 3.290 1.523 58.6 S10 Spherical -73.448 45.496 S11 Spherical -126.918 3.460 1.801 35.0 S12 Spherical -24.336 2.000 1.729 54.7 S13 Spherical 24.798 13.733 S14 Spherical 36.665 3.079 1.673 32.2 S15 Spherical 5479.318 30.648 S16 Spherical Infinity 1.500 1.517 64.2 S17 Spherical Infinity 0.500 IMA Image plane Infinity - -

[0163] Table 6

[0164] Combination Figures 13 to 15As shown in Table 1 and Table 6, in Example 5, the absolute value of the distortion of the aiming and viewing lens is 0.06%, the half field angle is 1.17°, the half image height is 4.08, and the total optical length TTL is 150 mm.

[0165] The fifth embodiment of the present invention is a sighting lens having at least one of the following characteristics: ultra-telephoto, miniaturization, wide spectrum (430nm-940nm), high resolution, low chromatic aberration, good thermal stability (-30-70°C), full field of view illumination ≥99%, and lens chief ray incident angle CRA<1.0°.

[0166] 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.

Claims

1. A sighting lens, characterized in that: Along the direction from the object side to the image side of the optical axis, it includes: A first lens (L1) with positive optical power, a second lens (L2) with positive optical power, a third lens (L3) with negative optical power, a fourth lens (L4) with positive optical power, a fifth lens (L5) with negative optical power, a sixth lens (L6) with positive optical power, a seventh lens (L7) with positive optical power, an eighth lens (L8) with negative optical power, and a ninth lens (L9) with positive optical power; The effective focal length F6 of the sixth lens (L6) and the effective focal length F of the aiming lens satisfy the following relationship: 0.2≤F6 / F≤2.0; The effective focal length F7 of the seventh lens (L7) and the effective focal length F of the aiming lens satisfy the following relationship: 0.09≤F7 / F≤0.

30.

2. The sighting lens according to claim 1, characterized in that: The first lens (L1) is a convex-concave lens, the second lens (L2) is a convex-concave lens, the third lens (L3) is a convex-concave lens, the object side surface of the fourth lens (L4) is a convex surface, and the image side surface of the fifth lens (L5) is a concave surface.

3. The sighting lens according to claim 1, characterized in that: The image side surface of the seventh lens (L7) is a convex surface, the eighth lens (L8) is a concave-concave lens, and the object side surface of the ninth lens (L9) is a convex surface.

4. The sighting lens according to claim 1, characterized in that: The third lens (L3), the fourth lens (L4) and the fifth lens (L5) form a triplet lens, or The third lens (L3), the fourth lens (L4), the fifth lens (L5) and the sixth lens (L6) form a four-cemented lens.

5. The sighting lens according to claim 4, characterized in that: The combined focal length Fa of the triplet lens or the quadruplet lens and the effective focal length F of the aiming lens satisfy the following relationship: -1.69≤Fa / F≤-0.

14.

6. The sighting lens according to claim 1, characterized in that: The seventh lens (L7) and the eighth lens (L8) form a doublet lens.

7. The sighting lens according to claim 6, characterized in that: The combined focal length Fb of the double cemented lens and the effective focal length F of the sighting lens satisfy the following relationship: -0.30≤Fb / F≤-0.

09.

8. The aiming lens according to any one of claims 1 to 7, characterized in that: The effective focal length F1 of the first lens (L1) and the effective focal length F of the aiming lens satisfy the following relationship: 0.6≤F1 / F≤1.

5.

9. The aiming lens according to any one of claims 1 to 7, characterized in that: The effective focal length F2 of the second lens (L2) and the effective focal length F of the aiming lens satisfy the following relationship: 0.4≤F2 / F≤1.

1.

10. The aiming lens according to any one of claims 1 to 7, characterized in that: The effective focal length F3 of the third lens (L3) and the effective focal length F of the aiming lens satisfy the following relationship: -0.7≤F3 / F≤-0.2.

Images