Observing and aiming lens

Abstract

The utility model relates to an observing and aiming lens which is arranged along an optical axis 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 first lens (L1) is a convex-concave lens; 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 super-long focus, miniaturization, wide spectrum (430-940nm), 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 utility model relates to the technical field of imaging lenses, 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 undergone significant development. This laid the foundation for the birth of sight lenses. Sight lenses, also known as sights and sniper scopes, allow users to see the target more clearly.

[0003] Observation and aiming lenses are used in a variety of complex environments, necessitating the continuous development of adaptive technologies tailored to these conditions. This, in turn, places higher demands on these lenses. First, as handheld products, observation and aiming lenses prioritize portability, requiring minimal weight and size. This necessitates miniaturization. Second, their use involves observing detailed objects, resulting in a narrow field of view, necessitating a long focal length. Third, to discern minute details, high image quality and minimal ghosting are required. Fourth, to accommodate dim conditions such as dusk and early morning, they require high resolution across a wide spectrum of 430nm to 940nm, necessitating wide-spectrum chromatic aberration correction. Furthermore, to withstand adverse weather conditions such as fog, rain, and snow, waterproofing, anti-fog, and impact resistance are incorporated into the design and manufacture of observation and aiming lenses, ensuring stable performance in a variety of challenging environments and providing clear and accurate target observation.

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

[0005] 1. The sighting lens in the existing technology is difficult to achieve both lens aperture and high image quality;

[0006] 2. It is difficult for existing sighting lenses to achieve both a long focal length and a shorter overall optical length.

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

[0008] 4. The existing viewing and aiming lenses have little room for optimizing ghost images, making it 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. Utility Model Content

[0010] In order to solve the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a sighting lens having at least one of the characteristics of ultra-long focal length, miniaturization, wide spectrum, and high resolution.

[0011] To achieve the above-mentioned purpose, 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 having positive optical power, a second lens having positive optical power, a third lens having negative optical power, a fourth lens having positive optical power, a fifth lens having negative optical power, a sixth lens having positive optical power, a seventh lens having positive optical power, an eighth lens having negative optical power, and a ninth lens having positive optical power;

[0013] The first lens is a convex-concave lens;

[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 utility model, the second lens is a convex-concave lens, the third lens is a convex-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] The image-side surface of the seventh lens is convex, the eighth lens is a concave-concave lens, and the object-side surface of the ninth lens is convex.

[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-lens cemented lens.

[0019] According to a technical solution of the present invention, the combined focal length Fa of the triplet lens or the quadruple lens and the effective focal length F of the sighting 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 doublet lens and the effective focal length F of the sighting 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 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.

[0028] 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.

[0029] According to a technical solution of the present invention, the combined effective focal length F16 of the first to sixth lenses and the effective focal length F of the aiming lens satisfy the following relationship: 0.4≤F16 / F≤0.7.

[0030] 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.

[0031] According to a technical solution of the present invention, the Abbe number VD4 of the fourth lens satisfies the following relationship: 60≤VD4≤100.

[0032] According to a technical solution 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.

[0033] According to a technical solution 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.

[0034] According to a technical solution of the present invention, the total optical length TTL and the back focus length BFL of the viewing and aiming lens satisfy the following relationship: 0.1≤BFL / TTL≤0.3.

[0035] 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.

[0036] According to a technical solution of the present invention, the sighting lens satisfies at least one of the following conditions:

[0037] 0.68≤F1 / F≤1.33,

[0038] -0.55≤F3 / F≤-0.22,

[0039] 0.20≤F4 / F≤0.41,

[0040] 0.49≤F16 / F≤0.68,

[0041] 75.46≤VD4≤94.36,

[0042] 0.16≤BFL / TTL≤0.30,

[0043] Wherein, 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.

[0044] According to the solution of the present invention, the observation 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 positive optical power, positive optical power, negative optical power, positive optical power, negative optical power, positive optical power, positive optical power, negative optical power, and positive optical power. At the same time, the ratio of the effective focal length of the seventh lens to the observation and aiming lens is reasonably configured, so that the observation 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 of view illumination ≥99%, and lens chief ray incidence angle CRA<1.0°. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0046] Figure 1 This is a schematic structural diagram of the sighting lens of Example 1 of the present utility model;

[0047] Figure 2 This is a relative illumination diagram of the viewing lens of Example 1 of the present utility model;

[0048] Figure 3 This is a horizontal light fan diagram of the viewing lens of Example 1 of the present utility model;

[0049] Figure 4 This is a schematic structural diagram of the sighting lens of Example 2 of the present utility model;

[0050] Figure 5 This is a relative illumination diagram of the aiming and viewing lens of Example 2 of the present utility model;

[0051] Figure 6 This is a horizontal light fan diagram of the aiming lens of Example 2 of the present utility model;

[0052] Figure 7 This is a schematic structural diagram of the sighting lens of Example 3 of the present utility model;

[0053] Figure 8 This is a relative illumination diagram of the viewing and aiming lens of Example 3 of the present utility model;

[0054] Figure 9 This is a horizontal light fan diagram of the viewing and aiming lens of Example 3 of the present utility model;

[0055] Figure 10 Schematic diagram of the structure of the sighting lens of Example 4 of the present utility model;

[0056] Figure 11 This is a relative illumination diagram of the aiming and viewing lens of Example 4 of the present utility model;

[0057] Figure 12 This is a horizontal light fan diagram of the aiming lens of Example 4 of the present utility model;

[0058] Figure 13 Schematic diagram of the structure of the sighting lens of Example 5 of the present utility model;

[0059] Figure 14 This is a relative illumination diagram of the aiming lens of Example 5 of the present utility model;

[0060] Figure 15 This is a horizontal light fan diagram of the viewing lens of Example 5 of the present utility model. DETAILED DESCRIPTION

[0061] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely 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.

[0062] It should be noted that in this specification, the expressions first, second, third, etc. are only used to distinguish one feature from another, and do not represent any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the first lens.

[0063] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0064] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0065] 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 preclude 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 list of 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.

[0066] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those 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 expressly defined as such herein.

[0067] 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 following examples only express several implementation methods of the present application, and their descriptions are relatively specific and detailed, but they should not be understood as limiting the scope of the patent application. It should be pointed out that for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all fall within the scope of protection of the present application.

[0068] like Figures 1 to 15 As shown, an embodiment of the present invention provides a viewing and aiming 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.

[0069] The first lens L1 has positive refractive power, with a convex object-side surface and a concave image-side surface. The positive refractive power of the first lens L1 facilitates light collection, directing the light emitted from the first lens L1 toward the optical axis, reducing the aperture of the rear lens element and thus facilitating miniaturization. The concave image-side surface of the first lens L1 helps reduce the angle of incidence of axial light on the image-side surface of the first lens L1, reducing spherical aberration caused by the image-side surface of the first lens L1 and facilitating high image quality.

[0070] 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 high image quality.

[0071] Second lens element L2 has positive power, a convex object-side surface, and a concave image-side surface. This reduces the angle of incidence of on-axis light on the image-side surface of second lens element L2, thereby minimizing spherical aberration generated by the image-side surface of second lens element L2, thereby facilitating high image quality. Second lens element L2 can be paired with materials with lower dispersion to minimize chromatic aberration, simplifying system correction and ultimately achieving high image quality.

[0072] 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

[0073] The third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 form a quadruple lens.

[0074] Third lens L3 has negative power, a convex object-side surface, and a concave image-side surface. This reduces the angle of incidence of axial light on the object-side surface of third lens L3, thereby reducing spherical aberration on the object-side surface of third lens L3 and promoting high image quality. Third lens L3 has negative power in a cemented lens, and in conjunction with fourth lens L4, achieves apochromatism, further contributing to high image quality.

[0075] The fourth lens element, L4, has positive optical power and a convex object-side surface. This shared optical power reduces surface curvature and aberrations, ultimately contributing to high image quality. In a cemented lens, the fourth lens element, L4, possesses positive optical power and is preferably paired with low-dispersion materials to apochromatize the system, facilitating infrared confocality and high and low-temperature correction. The fourth lens element, L4, also compensates for the on-axis chromatic aberration introduced by the first lens element, L1, facilitating wide-spectrum chromatic aberration correction and achieving even higher image quality.

[0076] The fifth lens L5 has negative optical power and a concave image-side surface. This power is shared by the fifth lens L5, which can reduce surface curvature and minimize aberrations, thereby achieving high image quality. The fifth lens L5 has negative optical power in a cemented lens, and in conjunction with the fourth lens L4, achieves apochromatism, further contributing to high image quality. Optionally, the third lens L3, the fourth lens L4, and the fifth lens L5 form a triplet. The triplet has a negative focal length, generating negative spherical aberration to compensate for the positive spherical aberration introduced by the first and second lenses L1 and L2, further contributing to high image quality.

[0077] The sixth lens element L6 has positive power, which reduces the angle of incidence of on-axis light on the image-side surface of the sixth lens element L6, thereby reducing spherical aberration generated on the image-side surface of the sixth lens element L6, thereby facilitating high image quality. Optionally, the sixth lens element L6 can be combined with a low-dispersion material to form a four-lens lens with the third lens element L3, the fourth lens element L4, and the fifth lens element L5. The four-lens lens element has a negative focal length, generating negative spherical aberration to compensate for the positive spherical aberration introduced by the first lens element L1 and the second lens element L2, thereby achieving high image quality and reducing sensitivity to system tolerances.

[0078] In some embodiments of the present invention, the combined focal length Fa of the triplet or quadruple lens satisfies the following relationship with the effective focal length F of the sighting lens: -1.69 ≤ Fa / F ≤ -0.14. By rationally assigning the focal lengths of the triplet or quadruple lens, the cemented lens group can compensate for the on-axis chromatic aberration introduced by the first lens element L1, facilitating infrared confocal imaging. Furthermore, the negative focal length of the cemented lens group generates negative spherical aberration, which compensates for the positive spherical aberration introduced by the first lens element L1 and the second lens element L2, facilitating high image quality.

[0079] In some embodiments of the present invention, the seventh lens L7 and the eighth lens L8 form a doublet lens.

[0080] The seventh lens L7 has positive optical power, its image-side surface is convex, and its object-side surface can be either 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 facilitate high image quality.

[0081] The eighth lens L8 has negative refractive power, a concave object-side surface, and a concave image-side surface. The eighth lens L8 has negative refractive power in a doublet lens, and cooperates with the seventh lens L7 to achieve apochromatism, which is conducive to achieving high image quality.

[0082] 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 properly assigning the focal lengths of the doublet lens system consisting of seventh lens L7 and eighth lens L8, residual off-axis chromatic aberration can be corrected, facilitating high image quality.

[0083] The ninth lens element, L9, has positive focal power, a convex object-side surface, and a concave or flat image-side surface. Materials with low dispersion can be used for the ninth lens element, correcting residual chromatic aberration in the system and contributing to high image quality. The first through sixth lenses, L1, L6, and the rear group form a telephoto configuration, reducing overall optical length and facilitating 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 rationally allocating the focal length 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 closer to the optical axis, 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 element L2 and the effective focal length F of the aiming lens satisfy the following relationship: 0.4≤F2 / F≤1.1. By rationally allocating the focal length of the second lens element L2 and combining it with low-dispersion materials, chromatic aberration can be reduced, the difficulty of system correction can be lowered, and high image quality can be achieved.

[0086] In some embodiments of the present invention, the effective focal length F3 of the third lens element 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 rationally assigning the focal length of the third lens element L3, the third lens element L3 has negative power in a triplet or quadruple lens, and cooperates with the fourth lens element L4 to achieve apochromatism, thereby facilitating high image quality.

[0087] In some embodiments of the present invention, the effective focal length F4 of the fourth lens element L4 satisfies the following relationship with the effective focal length F of the observation lens: 0.18≤F4 / F≤0.50, preferably, 0.20≤F4 / F≤0.41. By rationally assigning the focal length of the fourth lens element L4, the fourth lens element L4 has positive power in a triplet or quadruple lens. When used with low-dispersion materials, the system is apochromatized, thereby facilitating infrared confocality.

[0088] In some embodiments of the present invention, the effective focal length F5 of the fifth lens element L5 and the effective focal length F of the aiming lens satisfy the following relationship: -0.4 ≤ F5 / F ≤ -0.1. By rationally assigning the focal length of the fifth lens element L5, the fifth lens element L5 has negative power in a triplet or quadruple lens, and cooperates with the fourth lens element L4 to achieve apochromatism, thereby facilitating high image quality.

[0089] In some embodiments of the present invention, the effective focal length F6 of the sixth lens element L6 satisfies the following relationship with the effective focal length F of the observation lens: 0.2≤F6 / F≤2.0. By rationally assigning the focal length of the sixth lens element L6, the sixth lens element L6 has positive power in the four-lens composite lens. When used with low-dispersion materials, the system is apochromatized, thereby facilitating infrared confocal imaging.

[0090] In some embodiments of the present invention, the effective focal length F7 of the seventh lens element L7 and the effective focal length F of the sighting lens satisfy the following relationship: 0.09≤F7 / F≤0.30. By properly assigning the focal length of the seventh lens element L7, the seventh lens element L7 has positive power in the doublet lens. When used with low-dispersion materials, the system is apochromatized, which facilitates infrared confocality.

[0091] In some embodiments of the present invention, the effective focal length F8 of the eighth lens element L8 and the effective focal length F of the sighting lens satisfy the following relationship: -0.15 ≤ F8 / F ≤ -0.02. The eighth lens element L8 has negative focal power in a doublet lens and, in conjunction with the seventh lens element L7, achieves apochromatism, facilitating high image quality.

[0092] In some embodiments of the present invention, the combined effective focal length F16 of the first through sixth lens elements L1 through L6 and the effective focal length F of the viewing lens satisfy the following relationship: 0.4≤F16 / F≤0.7, preferably, 0.49≤F16 / F≤0.68. By rationally allocating the combined effective focal lengths of the first through sixth lens elements L1 through L6, they form a telephoto architecture with the rear lens group, thereby reducing the overall optical length and achieving miniaturization.

[0093] In some embodiments of the present invention, the refractive index ND1 of the first lens element L1 satisfies the following relationship: 1.85≤ND1≤1.98. By properly setting the refractive index of the first lens element L1, the first lens element L1 can be preferably made of a material with a larger refractive index, thereby reducing surface curvature and aberrations, thereby facilitating high image quality.

[0094] In some embodiments of the present invention, the Abbe number VD4 of the fourth lens element L4 satisfies the following relationship: 60≤VD4≤100, preferably, 75.46≤VD4≤94.36. By properly setting the Abbe number of the fourth lens element L4, the fourth lens element L4 can be preferably made of a material with a larger Abbe number, which is beneficial for correcting chromatic aberration and high and low temperature conditions, achieving zero out-of-focus in the temperature range of -30°C to 70°C, and simultaneously reducing infrared defocus, thereby improving the resolution of visible and infrared light.

[0095] In some embodiments of the present invention, the effective focal length F of the sighting 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 clear 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, by controlling the maximum clear aperture of the system, the maximum clear aperture of the system is reduced, 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 sighting 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, the curvature radius R32 of the image-side surface of the third lens element L3 and the curvature radius R52 of the image-side surface of the fifth lens element L5 satisfy the following relationship: 0.12≤R32 / R52≤1.2. By properly controlling the curvature radii of the image-side surface of the third lens element L3 and the image-side surface of the fifth lens element L5, it is beneficial to smooth the incident light and reduce the risk of high-energy ghost images caused by off-axis light.

[0099] Based on the above-described configuration of the present invention, five specific embodiments are provided below to illustrate the viewing / aiming lens according to the present invention. The viewing / aiming lens according to the present invention comprises nine lenses, with each cemented surface of the cemented lens being considered a face. Together with the cover glass CG and the image plane IMA, this adds up to 17 or 18 faces. The aperture stop STO is positioned between the first lens L1 and the second lens L2.

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

[0101] Conditional expression Example 1 Example 2 Example 3 Example 4 Example 5 0.6≤F1 / F≤1.5 1.271 0.993 0.837 0.907 0.734 0.4≤F2 / F≤1.1 0.671 0.958 0.534 0.848 0.712 -0.7≤F3 / F≤-0.2 -0.500 -0.500 -0.273 -0.398 -0.343 0.18≤F4 / F≤0.50 0.298 0.358 0.238 0.333 0.271 -0.4≤F5 / F≤-0.1 -0.283 -0.230 -0.170 -0.204 -0.343 0.2≤F6 / F≤2.0 0.775 0.329 0.358 0.298 1.932 0.09≤F7 / F≤0.30 0.215 0.191 0.151 0.194 0.187 -0.15≤F8 / F≤-0.02 -0.083 -0.093 -0.091 -0.098 -0.083 -1.69≤Fa / F≤-0.14 -0.510 -1.631 -0.193 -0.853 -0.507 -0.30≤Fb / F≤-0.09 -0.142 -0.185 -0.246 -0.200 -0.151 0.4≤F16 / F≤0.7 0.548 0.548 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 75.510 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 0.441 0.440 0.441 0.445 0.1≤BFL / TTL≤0.3 0.220 0.220 0.221 0.220 0.218 0.12≤R32 / R52≤1.2 0.664 1.072 0.900 1.009 0.176

[0102] Table 1

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

[0104] Example 1

[0105] Figure 1 This is a schematic structural diagram of the sighting lens of Example 1 of the present utility model;

[0106] Figure 2 This is a relative illumination diagram of the viewing lens of Example 1 of the present utility model;

[0107] Figure 3 This is a horizontal light fan diagram of the viewing lens of Example 1 of the present invention.

[0108] In Example 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-plano lens with positive power.

[0109] The first lens L1 to the ninth lens L9 are all spherical lenses; the aperture STO is arranged 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 surface 163.892 4.387 1.923 20.9 S2 spherical surface 535.010 4.000 STO aperture Infinity -3.900 S3 spherical surface 65.638 9.998 1.593 68.3 S4 spherical surface 365.967 0.970 S5 spherical surface 72.149 2.503 1.750 35.0 S6 spherical surface 36.138 14.315 1.550 75.5 S7 spherical surface -283.118 2.000 1.805 25.5 S8 spherical surface 54.389 11.039 S9 spherical surface 39.131 4.124 1.870 20.0 S10 spherical surface 52.393 39.699 S11 spherical surface 121.874 3.363 1.785 25.7 S12 spherical surface -46.106 2.000 1.954 32.3 S13 spherical surface 24.639 19.329 S14 spherical surface 36.485 3.172 1.673 32.2 S15 spherical surface Infinity 30.999 S16 spherical surface Infinity 1.500 1.517 64.2 S17 spherical surface Infinity 0.500 IMA Image plane Infinity - -

[0113] Table 2

[0114] Combine 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, a wide spectrum (430nm-940nm), high resolution, low chromatic aberration, good thermal stability (-30°C-70°C), full field of view illumination ≥99%, and a chief ray incident angle (CRA) <1.0°.

[0116] Example 2

[0117] Figure 4 This is a schematic structural diagram of the sighting lens of Example 2 of the present utility model;

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

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

[0120] In the second embodiment,

[0121] The first lens L1 is a convexo-concave lens with positive optical power, the second lens L2 is a convexo-concave lens with positive optical power, the third lens L3 is a convexo-concave lens with negative optical power, the fourth lens L4 is a convexo-concave lens with positive optical power, the fifth lens L5 is a convexo-concave lens with negative optical power, the sixth lens L6 is a convexo-concave lens with positive optical power, the seventh lens L7 is a convexo-convex lens with positive optical power, the eighth lens L8 is a convexo-concave lens with negative optical power, and the ninth lens L9 is a convex-plano lens with positive optical power.

[0122] The first lens L1 to the ninth lens L9 are all spherical lenses; the aperture STO is arranged between the first lens L1 and the second lens L2.

[0123] The third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 form a quadruple lens; the seventh lens L7 and the eighth lens L8 form a doublet lens.

[0124] Table 3 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.

[0125] Surface serial number Surface type Curvature radius R Thickness d Refractive index Nd Abbe number Vd S1 spherical surface 126.105 5.845 1.923 18.9 S2 spherical surface 393.201 5.158 STO aperture Infinity -2.000 S3 spherical surface 54.033 7.914 1.618 63.4 S4 spherical surface 94.334 8.593 S5 spherical surface 55.344 2.000 1.883 39.2 S6 spherical surface 33.394 11.332 1.550 75.5 S7 spherical surface 200.000 2.000 1.808 22.7 S8 spherical surface 31.162 8.490 1.593 68.3 S9 spherical surface 142.110 34.098 S10 spherical surface -416.264 3.582 1.923 20.9 S11 spherical surface -32.598 1.500 1.835 42.7 S12 spherical surface 30.112 25.543 S13 spherical surface 46.721 2.944 1.648 33.9 S14 spherical surface Infinity 30.996 S15 spherical surface Infinity 1.500 1.517 64.2 S16 spherical surface Infinity 0.500 IMA Image plane Infinity - -

[0126] Table 3

[0127] Combine Figures 4 to 6 As shown in Tables 1 and 3 above, in Example 2, the absolute value of the distortion of the sighting lens is 0.08%, the half field angle is 1.18°, the half image height is 4.08, and the total optical length TTL is 150 mm.

[0128] 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 of view illumination ≥ 99%, and lens chief ray incidence angle CRA < 1.0°.

[0129] Example 3

[0130] Figure 7 This is a schematic structural diagram of the sighting lens of Example 3 of the present utility model;

[0131] Figure 8 This is a relative illumination diagram of the viewing and aiming lens of Example 3 of the present utility model;

[0132] Figure 9 This is a horizontal light fan diagram of the viewing lens of Example 3 of the present utility model.

[0133] In Example 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.

[0134] The first lens L1 to the ninth lens L9 are all spherical lenses; the aperture STO is arranged between the first lens L1 and the second lens L2.

[0135] 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.

[0136] Table 4 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.

[0137]

[0138]

[0139] Table 4

[0140] Combine Figures 7 to 9 As shown in Tables 1 and 4 above, 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.

[0141] 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 incidence angle CRA < 1.0°.

[0142] Example 4

[0143] Figure 10 Schematic diagram of the structure of the sighting lens of Example 4 of the present utility model;

[0144] Figure 11 This is a relative illumination diagram of the aiming and viewing lens of Example 4 of the present utility model;

[0145] Figure 12 This is a horizontal light fan diagram of the viewing lens of Example 4 of the present utility model.

[0146] In Example 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-plano lens with positive power.

[0147] The first lens L1 to the ninth lens L9 are all spherical lenses; the aperture STO is arranged between the first lens L1 and the second lens L2.

[0148] The third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 form a quadruple lens; the seventh lens L7 and the eighth lens L8 form a doublet lens.

[0149] Table 5 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.

[0150] Surface serial number Surface type Curvature radius R Thickness d Refractive index Nd Abbe number Vd S1 spherical surface 118.662 6.141 1.923 18.9 S2 spherical surface 394.958 4.000 STO aperture Infinity -3.900 S3 spherical surface 50.481 8.766 1.639 55.5 S4 spherical surface 88.622 9.376 S5 spherical surface 55.578 2.424 1.911 35.3 S6 spherical surface 30.755 12.006 1.497 81.6 S7 spherical surface 424.231 2.272 1.808 22.7 S8 spherical surface 30.482 8.796 1.618 63.4 S9 spherical surface 161.000 32.885 S10 spherical surface -369.678 3.541 1.923 20.9 S11 spherical surface -32.897 1.500 1.835 42.7 S12 spherical surface 32.897 26.185 S13 spherical surface 47.552 2.948 1.673 32.2 S14 spherical surface Infinity 31.059 S15 spherical surface Infinity 1.500 1.517 64.2 S16 spherical surface Infinity 0.500 IMA Image plane Infinity - -

[0151] Table 5

[0152] Combine Figures 10 to 12 As shown in Tables 1 and 5 above, in Example 4, the absolute value of the distortion of the sighting 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 of view illumination ≥ 99%, and lens chief ray incidence angle CRA < 1.0°.

[0154] Example 5

[0155] Figure 13 Schematic diagram of the structure of the aiming and viewing lens of Example 5 of the present invention;

[0156] Figure 14 This is a relative illumination diagram of the aiming lens of Example 5 of the present invention;

[0157] Figure 15 This is a transverse ray fan diagram of the aiming lens according to the fifth embodiment of the present invention.

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

[0159] The first lens L1 to the ninth lens L9 are all spherical lenses; the aperture STO is arranged 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 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.

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

[0163] Table 6

[0164] Combine Figures 13 to 15 As shown in Tables 1 and 6 above, in Example 5, the absolute value of the distortion of the sighting 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 incidence angle CRA < 1.0°.

[0166] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the utility model disclosed herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the concept of the utility model. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A sighting lens, characterized in that: Along the optical axis from the object side to the image side, 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 first lens (L1) is a convex-concave lens; 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, wherein: 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; 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.

3. The sighting lens according to claim 1, wherein: 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-lens cemented lens.

4. The sighting lens according to claim 3, wherein: The combined focal length Fa of the triplet lens or the quadruple lens and the effective focal length F of the sighting lens satisfy the following relationship: -1.69≤Fa / F≤-0.

14.

5. The sighting lens according to claim 1, wherein: The seventh lens (L7) and the eighth lens (L8) form a doublet lens.

6. The sighting lens according to claim 5, characterized in that: 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.

7. The sighting lens according to any one of claims 1 to 6, characterized in that: The effective focal length F1 of the first lens (L1) and the effective focal length F of the sighting lens satisfy the following relationship: 0.6≤F1 / F≤1.

5.

8. The sighting lens according to any one of claims 1 to 6, characterized in that: The effective focal length F2 of the second lens (L2) and the effective focal length F of the sighting lens satisfy the following relationship: 0.4≤F2 / F≤1.

1.

9. The sighting lens according to any one of claims 1 to 6, 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.

10. The sighting lens according to any one of claims 1 to 6, characterized in that: 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.

11. The sighting lens according to any one of claims 1 to 6, characterized in that: 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.

12. The sighting lens according to any one of claims 1 to 6, characterized in that: 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.

13. The sighting lens according to any one of claims 1 to 6, characterized in that: 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.

14. The sighting lens according to any one of claims 1 to 6, characterized in that: The combined effective focal length F16 of the first lens (L1) to the sixth lens (L6) and the effective focal length F of the sighting lens satisfy the following relationship: 0.4≤F16 / F≤0.

7.

15. The sighting lens according to any one of claims 1 to 6, characterized in that: The refractive index ND1 of the first lens (L1) satisfies the following relationship: 1.85≤ND1≤1.

98.

16. The sighting lens according to any one of claims 1 to 6, characterized in that: The Abbe number VD4 of the fourth lens (L4) satisfies the following relationship: 60≤VD4≤100.

17. The sighting lens according to any one of claims 1 to 6, characterized in that: The effective focal length F of the sighting lens and the entrance pupil diameter ENPD satisfy the following relationship: 2.9≤F / ENPD≤3.

1.

18. The sighting lens according to any one of claims 1 to 6, characterized in that: 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.

19. The sighting lens according to any one of claims 1 to 6, characterized in that: The total optical length TTL and the back focus length BFL of the sighting lens satisfy the following relationship: 0.1≤BFL / TTL≤0.

3.

20. The sighting lens according to any one of claims 1 to 6, characterized in that: The curvature radius R32 of the image side surface of the third lens (L3) and the curvature radius R52 of the image side surface of the fifth lens (L5) satisfy the following relationship: 0.12≤R32 / R52≤1.

2.

21. The sighting lens according to claim 1, wherein: The sighting lens satisfies at least one of the following conditions: 0.68≤F1 / F≤1.33, -0.55≤F3 / F≤-0.22, 0.20≤F4 / F≤0.41, 0.49≤F16 / F≤0.68, 75.46≤VD4≤94.36, 0.16≤BFL / TTL≤0.30, Wherein, 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 (L1), F3 is the effective focal length of the third lens (L3), F4 is the effective focal length of the fourth lens (L4), F16 is the combined effective focal length of the first lens (L1) to the sixth lens (L6), and VD4 is the Abbe number of the fourth lens (L4).

Images