A zoom lens

Abstract

The application discloses a zoom lens, which comprises, in sequence along an optical axis from an object plane to an image plane, a focusing lens group, a diaphragm and a zoom lens group; the focusing lens group and the zoom lens group are arranged to be movable along the optical axis direction; the focusing lens group has negative optical power, and the zoom lens group has positive optical power; in the zoom lens, the number of lenses with optical power is 10; the focusing lens group comprises a first lens, a second lens and a third lens with optical power; and the zoom lens group comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens with optical power. The technical scheme of the application can realize the zoom lens with small size, large aperture, full-waveband confocal in a 436nm-850nm waveband, high image quality and other excellent characteristics.

Description

Technical Field

[0001] This invention relates to the field of optical lens technology, and more particularly to a zoom lens. Background Technology

[0002] In the security field, zoom lenses are widely used due to their advantages such as long shooting distance and wide shooting angle. With technological advancements, cameras are gradually becoming smaller and more refined, which places even stricter demands on mainstream zoom lenses.

[0003] Traditional zoom lenses suffer from drawbacks such as small aperture, non-confocal infrared capability, large size, and poor image quality, which urgently need to be optimized to meet the needs of more usage scenarios. Summary of the Invention

[0004] This invention provides a zoom lens that achieves excellent characteristics such as small size, large aperture, full-band confocal focal length in the 436nm-850nm wavelength range, and high image quality.

[0005] The zoom lens provided by the present invention includes a focusing lens group, an aperture stop, and a zoom lens group arranged sequentially from the object plane to the image plane along the optical axis; the focusing lens group and the zoom lens group are movable along the optical axis.

[0006] The focusing lens group has negative optical power, while the zoom lens group has positive optical power.

[0007] The focusing lens group includes a first lens, a second lens, and a third lens arranged sequentially from the object plane to the image plane along the optical axis; the zoom lens group includes a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged sequentially from the object plane to the image plane along the optical axis.

[0008] The first lens is a negative power lens, the second lens is a negative power lens, the third lens is a positive power lens, the fourth lens is a positive power lens, the fifth lens is a positive power lens, the sixth lens is a positive or negative power lens, the seventh lens is a negative power lens, the eighth lens is a positive power lens, the ninth lens is a negative power lens, and the tenth lens is a positive power lens.

[0009] In a zoom lens, there are 10 lenses with optical power.

[0010] Optionally, the first lens, the fourth lens, the seventh lens, and the eighth lens are all glass spherical lenses;

[0011] The second, third, fifth, sixth, ninth, and tenth lenses are all plastic aspherical lenses.

[0012] Optionally, the surface of the lens adjacent to the object plane is the object-side surface, and the surface of the lens adjacent to the image plane is the image-side surface; the lens includes a paraxial region, and in a zoom lens, at least in the paraxial region, the following conditions are met:

[0013] The object-side surface of the first lens is convex towards the object plane, and the image-side surface of the first lens is concave towards the image plane; or, the object-side surface of the first lens is concave towards the object plane, and the image-side surface of the first lens is concave towards the image plane.

[0014] The object-side surface of the second lens is concave towards the object plane, and the image-side surface of the second lens is concave towards the image plane; or, the object-side surface of the second lens is convex towards the object plane, and the image-side surface of the second lens is concave towards the image plane.

[0015] The object-side surface of the third lens bulges towards the object plane, and the image-side surface of the third lens bulges towards the image plane.

[0016] The object-side surface of the fourth lens bulges towards the object plane, and the image-side surface of the fourth lens bulges towards the image plane.

[0017] The object-side surface of the fifth lens convexes towards the object plane, while the image-side surface of the fifth lens is concave towards the image plane.

[0018] The object-side surface of the sixth lens convexes towards the object plane, while the image-side surface of the sixth lens is concave towards the image plane.

[0019] The object-side surface of the seventh lens convexes towards the object plane, while the image-side surface of the seventh lens is concave towards the image plane.

[0020] The object-side surface of the eighth lens convexes towards the object plane, and the image-side surface of the eighth lens convexes towards the image plane.

[0021] The object-side surface of the ninth lens is concave towards the object plane, and the image-side surface of the ninth lens is convex towards the image plane.

[0022] The object-side surface of the tenth lens convexes towards the object plane, while the image-side surface of the tenth lens is concave towards the image plane.

[0023] Optionally, the focal length of the focusing lens group is F1, the focal length of the zoom lens group is F2, and the focal length of the zoom lens at the wide-angle end is FW, where:

[0024] -2.515≤F1 / FW≤-2.170; 2.219≤F2 / FW≤2.294.

[0025] Optionally, the seventh and eighth lenses form a cemented lens group; the focal length of the cemented lens group is F78, and the focal length of the zoom lens group is F2, wherein:

[0026] 3.078≤F78 / F2≤9.391.

[0027] Optionally, the zoom lens has a focal length of FW at the wide-angle end and a focal length of FT at the telephoto end, where:

[0028] FT / FW ≥ 2.18.

[0029] Optionally, the refractive index of the fourth lens is Nd4, and the Abbe number of the fourth lens is Vd4, where:

[0030] 1.497≤Nd4≤1.593; 68.342≤Vd4≤81.608.

[0031] Optionally, the maximum movable distance of the focusing lens group along the optical axis is S1; the maximum movable distance of the zoom lens group along the optical axis is S2; when the zoom lens is at the wide-angle end, the distance from the center of the optical axis of the object surface of the first lens to the image plane is TTL; when the zoom lens is at the wide-angle end, the distance from the center of the optical axis of the image surface of the tenth lens to the image plane is BFLW; wherein:

[0032] 0.121≤S2 / TTL≤0.156, 0.715≤S1 / BFLW≤0.836.

[0033] Optionally, at the wide-angle end of the zoom lens, the distance from the center of the optical axis of the object surface of the first lens to the image plane is TTL; the entrance pupil diameter of the zoom lens at the wide-angle end is EPD; the distance between the incident ray corresponding to the maximum image height and the vertex of the first lens in the perpendicular direction is L1; the radius of curvature of the object surface of the first lens is R1, and the radius of curvature of the image surface of the first lens is R2, wherein:

[0034] 12.368≤TTL / EPD≤12.894; 0.105≤L1 / TTL≤0.108;

[0035] 0.892≤(R1+R2) / (R1-R2)≤1.231.

[0036] Optionally, when the zoom lens is at the wide-angle end, the distance from the center of the optical axis of the object surface of the first lens to the aperture stop is TTLS; the distance from the center of the optical axis of the object surface of the first lens to the image plane is TTL; the maximum principal ray angle of the zoom lens in the full field of view at the wide-angle end is CRAm; where:

[0037] 0.420≤TTLS / TTL≤0.424; 8.460°≤CRAm≤11.900°.

[0038] The technical solution of this invention provides a dual-group zoom lens, including a focusing lens group and a zoom lens group arranged sequentially along the optical axis from the object plane to the image plane. Specifically, it employs 10 lenses with optical power, which reduces the number of lenses, thereby helping to reduce the length and volume of the lens. By reasonably matching the focusing lens group, the zoom lens group, and the optical power of each lens, aberrations can be better corrected, ensuring image clarity at different focal lengths. At the same time, this zoom lens has the advantages of small size, large aperture, and full-band confocal focusing in the 436nm-850nm wavelength range, meeting the needs of security monitoring.

[0039] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention;

[0042] Figure 2 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention;

[0043] Figure 3 This is the lateral chromatic aberration curve of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention;

[0044] Figure 4 This is the ray fan diagram of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention;

[0045] Figure 5 This is the axial aberration curve of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention;

[0046] Figure 6 This is the vertical chromatic aberration curve of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention;

[0047] Figure 7 This is the ray fan diagram of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention;

[0048] Figure 8 This is the axial aberration curve of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention;

[0049] Figure 9 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 2 of the present invention;

[0050] Figure 10 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention;

[0051] Figure 11 This is the lateral chromatic aberration curve of the zoom lens at the wide-angle end provided in Embodiment 2 of the present invention;

[0052] Figure 12 This is the ray fan pattern of the zoom lens at the wide-angle end provided in Embodiment 2 of the present invention;

[0053] Figure 13 This is the axial aberration curve of the zoom lens at the wide-angle end provided in Embodiment 2 of the present invention;

[0054] Figure 14 This is the vertical chromatic aberration curve of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention;

[0055] Figure 15 This is the light fan pattern of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention;

[0056] Figure 16 This is the axial aberration curve of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention;

[0057] Figure 17 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 3 of the present invention;

[0058] Figure 18 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention;

[0059] Figure 19 This is the vertical chromatic aberration curve of the zoom lens at the wide-angle end provided in Embodiment 3 of the present invention;

[0060] Figure 20 This is the ray fan pattern of the zoom lens at the wide-angle end provided in Embodiment 3 of the present invention;

[0061] Figure 21 This is the axial aberration curve of the zoom lens at the wide-angle end provided in Embodiment 3 of the present invention;

[0062] Figure 22 This is the vertical chromatic aberration curve of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention;

[0063] Figure 23 This is the ray fan pattern of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention;

[0064] Figure 24 This is the axial aberration curve of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention. Detailed Implementation

[0065] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0066] Various modifications and variations can be made to this application without departing from its spirit or scope, which will be apparent to those skilled in the art. Therefore, this application is intended to cover modifications and variations falling within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the implementation methods provided in the embodiments of this application can be combined with each other without contradiction.

[0067] First, it should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "comprising" and similar terms mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Furthermore, the shapes and sizes of the components in the accompanying drawings do not reflect actual proportions and are only intended to illustrate the content of this invention.

[0068] Example 1

[0069] Figure 1 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention. Figure 2 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention, as shown below. Figure 1 and Figure 2As shown, the zoom lens provided by the present invention includes a focusing lens group G1, an aperture stop 201, and a zoom lens group G2 arranged sequentially along the optical axis from the object plane to the image plane; the focusing lens group G1 and the zoom lens group G2 are movable along the optical axis; the focusing lens group G1 has negative optical power, and the zoom lens group G2 has positive optical power; the focusing lens group G1 includes a first lens 101, a second lens 102, and a third lens 103 arranged sequentially along the optical axis from the object plane to the image plane; the zoom lens group G2 includes a fourth lens 104, a fifth lens 105, a sixth lens 106, and a seventh lens 103 arranged sequentially along the optical axis from the object plane to the image plane. Lens 107, eighth lens 108, ninth lens 109, and tenth lens 110; the first lens 101 is a negative power lens, the second lens 102 is a negative power lens, the third lens 103 is a positive power lens, the fourth lens 104 is a positive power lens, the fifth lens 105 is a positive power lens, the sixth lens 106 is a negative power lens, the seventh lens 107 is a negative power lens, the eighth lens 108 is a positive power lens, the ninth lens 109 is a negative power lens, and the tenth lens 110 is a positive power lens; the zoom lens contains 10 lenses with optical power. It should be noted that in other embodiments, the sixth lens 106 can also be a positive power lens, as illustrated later.

[0070] In the zoom lens provided in this embodiment, the focusing lens group G1 and the zoom lens group G2 can be disposed in one lens barrel. Figure 1 (Not shown in the image). The focusing lens group G1 and the zoom lens group G2 can reciprocate along the optical axis within the lens barrel. Through the combined movement of the focusing lens group G1 and the zoom lens group G2, the focal length of the zoom lens can be continuously varied from wide-angle to telephoto.

[0071] Understandably, during the zoom process achieved by moving the focusing lens group G1 and the zoom lens group G2, the zoom lens is at its shortest focal length, i.e., at the wide-angle end, and at its longest focal length, i.e., at the telephoto end. At the wide-angle end and the telephoto end, the zoom lens has different focal lengths and optical powers, as well as different lengths or shapes.

[0072] The zoom lens in this embodiment adopts a dual-group structure, which reduces the difficulty of implementing zoom function, reduces the number of lenses, ensures the miniaturization of the zoom lens design, and meets the usage needs under more conditions. In addition, the entire optical system has only ten lenses with optical power, which can better control the cost of materials and coatings, and control the cost of the zoom lens to the greatest extent. At the same time, it has a good corrective effect on aberrations, chromatic aberrations, and sensitivity, ensuring that the zoom lens has high image quality at all focal points.

[0073] Furthermore, optical power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam; it characterizes the ability of an optical system to deflect light rays. The larger the absolute value of the optical power, the stronger the bending ability of light rays; the smaller the absolute value, the weaker the bending ability. When the optical power is positive, the refraction of light rays is converging; when the optical power is negative, the refraction of light rays is diverging. Optical power can be used to characterize a single refractive surface of a lens (i.e., one surface of the lens), a single lens, or a system formed by multiple lenses (i.e., a lens group).

[0074] In this embodiment, by setting the focusing lens group G1 to have negative optical power and the zoom lens group G2 to have positive optical power, the optical powers of the focusing lens group G1 and the zoom lens group G2 are coordinated with each other, which can improve the aberrations caused by the zoom movement of the focusing lens group G1 and the zoom lens group G2, and ensure the clarity of the image under different focal lengths.

[0075] Furthermore, such as Figure 1 and Figure 2 As shown, the focusing lens group G1 includes a first lens 101 with negative optical power, a second lens 102 with negative optical power, and a third lens 103 with positive optical power, arranged sequentially along the optical axis from the object plane to the image plane; the zoom lens group G2 includes a fourth lens 104 with positive optical power, a fifth lens 105 with positive optical power, a sixth lens 106 with negative optical power, a seventh lens 107 with negative optical power, an eighth lens 108 with positive optical power, a ninth lens 109 with negative optical power, and a tenth lens 110 with positive optical power, arranged sequentially along the optical axis from the object plane to the image plane.

[0076] The zoom lens provided in this embodiment of the invention uses only 10 lenses with optical power, which helps to reduce the length and volume of the lens, making the total optical length of the lens less than 34mm. In addition, the above-mentioned combination of optical power can balance the flexibility of the entire system at different magnifications, achieve the optimal solution in the balance of performance and parameters, meet more usage requirements while controlling costs, can better correct aberrations, improve image quality, and realize a zoom lens with a large aperture and full-band confocal focus in the 436nm-850nm band. It can be matched with a 1 / 2.7" image sensor and can meet the needs of security monitoring.

[0077] In summary, this invention provides a dual-group zoom lens, comprising a focusing lens group G1 and a zoom lens group G2 arranged sequentially along the optical axis from the object plane to the image plane. Specifically, it employs 10 lenses with optical power, a relatively small number of which helps reduce the lens length and size. By rationally combining the focusing lens group G1, the zoom lens group G2, and the optical power of each lens, aberrations can be effectively corrected, ensuring image clarity at different focal lengths. Simultaneously, this zoom lens possesses advantages such as small size, large aperture, and full-band confocal focusing in the 436nm-850nm wavelength range, meeting the needs of security monitoring.

[0078] Based on the above embodiments, optionally, both the focusing lens group G1 and the zoom lens group G2 of the zoom lens have at least two plastic aspherical lenses and at least one glass spherical lens.

[0079] Reference Figure 1 Specifically, the first lens 101, the fourth lens 104, the seventh lens 107 and the eighth lens 108 are all glass spherical lenses; the second lens 102, the third lens 103, the fifth lens 105, the sixth lens 106, the ninth lens 109 and the tenth lens 110 are all plastic aspherical lenses.

[0080] Lens aberrations are one of the main factors affecting image quality. In zoom lenses, because the various lens groups need to move relative to each other, controlling only the aberrations in one state is insufficient. This embodiment incorporates aspherical lenses into both the focusing lens group G1 and the zoom lens group G2, ensuring that the aberrations of each configuration of the zoom lens are in a relatively balanced state. Through overall lens correction, a clear imaging effect across the entire 436nm-850nm wavelength range can be achieved.

[0081] Furthermore, the use of glass and plastic materials can compensate for each other's weaknesses. This embodiment, by employing a combination of glass and plastic lenses in both the focusing lens group G1 and the zoom lens group G2, effectively balances the lens's resolution under high and low temperatures, ensuring good resolution within the range of -40 to 80°C. This gives the zoom lens stable performance at both high and low temperatures, improving its environmental adaptability and image quality. In addition, the appropriate combination of glass lenses also helps correct aberrations in the zoom lens. Moreover, the zoom lens provided in this embodiment uses only four glass lenses, significantly reducing its weight and cost.

[0082] The plastic aspherical lens can be made of various plastics known to those skilled in the art, and the glass spherical lens can be made of various types of glass known to those skilled in the art. This embodiment of the invention will not elaborate on or limit these materials.

[0083] Reference Figure 1 Optionally, the surface of the lens adjacent to the object plane is the object-side surface, and the surface of the lens adjacent to the image plane is the image-side surface; the lens includes a paraxial region, and in the zoom lens, at least in the paraxial region, the following conditions are met: the object-side surface of the first lens 101 convexes towards the object plane, and the image-side surface of the first lens 101 is concave towards the image plane; the object-side surface of the second lens 102 convexes towards the object plane, and the image-side surface of the second lens 102 is concave towards the image plane; the object-side surface of the third lens 103 convexes towards the object plane, and the image-side surface of the third lens 103 convexes towards the image plane; the object-side surface of the fourth lens 104 convexes towards the object plane, and the image-side surface of the fourth lens 104 convexes towards the image plane; the fifth lens 105... The object-side surface of the fifth lens 105 is convex towards the object plane, and the image-side surface of the sixth lens 106 is concave towards the image plane; the object-side surface of the sixth lens 106 is convex towards the object plane, and the image-side surface of the sixth lens 106 is concave towards the image plane; the object-side surface of the seventh lens 107 is convex towards the object plane, and the image-side surface of the seventh lens 107 is concave towards the image plane; the object-side surface of the eighth lens 108 is convex towards the object plane, and the image-side surface of the eighth lens 108 is convex towards the image plane; the object-side surface of the ninth lens 109 is concave towards the object plane, and the image-side surface of the ninth lens 109 is convex towards the image plane; the object-side surface of the tenth lens 110 is convex towards the object plane, and the image-side surface of the tenth lens 110 is concave towards the image plane.

[0084] It should be noted that the surface shapes of the first lens 101 and the second lens 102 described above are not unique. For the first lens 101, in other embodiments, optionally, the object-side surface of the first lens 101 is concave towards the object plane, and the image-side surface of the first lens 101 is concave towards the image plane. For the second lens 102, in other embodiments, optionally, the object-side surface of the second lens 102 is concave towards the object plane, and the image-side surface of the second lens 102 is concave towards the image plane. Specific embodiments will be illustrated later.

[0085] For any given lens, there are paraxial and off-axis regions. The paraxial region is the area near the optical axis, and the off-axis region is located on the side of the paraxial region away from the optical axis. For spherical lenses, the surface shape (concave or convex) of the paraxial region and the surface shape (concave or convex) of the off-axis region are consistent. For aspherical lenses, the surface shape of the off-axis region and the paraxial region can be the same or different, and this embodiment of the invention does not limit this.

[0086] This embodiment ensures that the optical power and focal length of each lens meet the requirements of this application by reasonably setting the surface shape of each lens, while also ensuring that the entire zoom lens structure is compact and the zoom lens has a high degree of integration.

[0087] Reference Figure 1Optionally, the focal length of the focusing lens group G1 is F1, the focal length of the zoom lens group G2 is F2, and the focal length of the zoom lens at the wide-angle end is FW, where: -2.515≤F1 / FW≤-2.170; 2.219≤F2 / FW≤2.294.

[0088] By using the above combination method, a reasonable combination of optical power can be achieved, allowing light to pass through the lens more smoothly and greatly correcting the impact of advanced lens aberrations on image quality.

[0089] Optionally, the seventh lens 107 and the eighth lens 108 form a cemented lens group; the focal length of the cemented lens group is F78, and the focal length of the zoom lens group G2 is F2, where: 3.078≤F78 / F2≤9.391.

[0090] When light passes through aperture 201, it will produce certain advanced aberrations. Cemented lenses can suppress these advanced aberrations to a certain extent, especially chromatic aberration. Placing a cemented lens after aperture 201 can prevent the aberrations from becoming too large and uncorrectable when light propagates to the rear of the lens, thus ensuring the relative illumination and image quality of the lens.

[0091] Optionally, the zoom lens has a focal length of FW at the wide-angle end and a focal length of FT at the telephoto end, where FT / FW ≥ 2.18. By controlling the focal length ratio at the wide-angle and telephoto ends of the lens, the zoom range and focal length range of the lens can be controlled to meet the usage needs under more conditions.

[0092] Reference Figure 1 Optionally, the refractive index of the fourth lens 104 is Nd4, and the Abbe number of the fourth lens 104 is Vd4, where: 1.497≤Nd4≤1.593; 68.342≤Vd4≤81.608.

[0093] Specifically, in this embodiment, the fourth lens 104 is a glass spherical lens and the fifth lens 105 is a plastic aspherical lens. By setting the refractive index and Abbe number of the fourth lens 104 to meet the above conditions, the glass spherical lens (fourth lens 104) and the plastic aspherical lens (fifth lens 105) can be combined to achieve an effect similar to that of a glass aspherical lens. This combines the high and low temperature stability of glass lenses with the aberration correction capability of plastic lenses. In this way, the light after passing through the aperture 201 first passes through the glass aspherical lens (fourth lens 104 and fifth lens 105), which can prevent excessive and difficult-to-eliminate advanced aberrations and chromatic aberrations from appearing at the end of the lens. While controlling costs, this improves the image quality of the lens, ensures the high and low temperature performance of the lens, and meets the needs of use in complex environments.

[0094] Reference Figure 1Optionally, the maximum movable distance of the focusing lens group G1 along the optical axis is S1; the maximum movable distance of the zoom lens group G2 along the optical axis is S2; when the zoom lens is at the wide-angle end, the distance from the center of the optical axis of the object surface of the first lens 101 to the image plane is TTL; when the zoom lens is at the wide-angle end, the distance from the center of the optical axis of the image surface of the tenth lens 110 to the image plane is BFLW; where: 0.121≤S2 / TTL≤0.156, 0.715≤S1 / BFLW≤0.836.

[0095] Specifically, the maximum movable distance of the focusing lens group G1 along the optical axis refers to the distance between the closest and farthest positions of the focusing lens group G1 to the image plane during its movement; the maximum movable distance of the zoom lens group G2 along the optical axis refers to the distance between the closest and farthest positions of the zoom lens group G2 to the image plane during its movement; the distance from the center of the optical axis of the object surface of the first lens 101 to the image plane can be understood as the total optical length of the lens; the distance from the center of the optical axis of the image surface of the tenth lens 110 to the image plane can be understood as the rear focal length of the lens.

[0096] This embodiment sets the focusing lens group G1 and the zoom lens group G2 to satisfy the above relationship during the switching between the wide-angle end and the telephoto end. By controlling the position of the zoom lens group G2, the reciprocating motion of the focusing lens group G1 can be indirectly controlled, which greatly reduces the size of the lens and can achieve a large magnification, thus expanding the application scenarios of the lens.

[0097] Reference Figure 1 Optionally, when the zoom lens is at the wide-angle end, the distance from the center of the optical axis of the object surface of the first lens 101 to the image plane is TTL; the entrance pupil diameter of the zoom lens at the wide-angle end is EPD; the distance between the incident ray corresponding to the maximum image height and the vertex of the first lens 101 in the perpendicular direction is L1; the radius of curvature of the object surface of the first lens 101 is R1, and the radius of curvature of the image surface of the first lens 101 is R2; where: 12.368≤TTL / EPD≤12.894; 0.105≤L1 / TTL≤0.108; 0.892≤(R1+R2) / (R1-R2)≤1.231.

[0098] The vertex of the first lens 101 refers to the center point of the object surface of the first lens 101, which is the intersection of the object surface and the optical axis. The perpendicular axis direction refers to the direction perpendicular to the optical axis. The distance between the incident ray corresponding to the maximum image height and the vertex of the first lens 101 in the perpendicular axis direction can be understood as the maximum effective radius of the first lens 101, which is the perpendicular distance (perpendicular axis height) from the intersection of the incident ray at the outermost edge of the system's entrance pupil and the object surface of the first lens 101 to the optical axis. In layman's terms, it is the "landing point height" of the ray at the edge of the object-side field of view on the first lens.

[0099] This embodiment, by controlling the relationship between the total optical length (TTL) and the entrance pupil diameter (EPD) of the lens at the wide-angle end, ensures that the zoom system has the largest possible aperture to meet the lens's usage requirements in dark conditions. Furthermore, by controlling the relationship between the maximum effective radius (L1) of the first lens 101 and the total optical length (TTL), as well as the relationship between the radii of curvature (R1, R2) of the object-side and image-side surfaces of the first lens 101, it is also possible to ensure that the lens structure has the maximum aperture that allows light to pass through, thereby increasing the lens's light incidence range and improving image quality.

[0100] Reference Figure 1 Optionally, when the zoom lens is at the wide-angle end, the distance from the center of the optical axis of the object surface of the first lens 101 to the aperture stop 201 is TTLS; when the zoom lens is at the wide-angle end, the distance from the center of the optical axis of the object surface of the first lens 101 to the image plane is TTL; the maximum principal ray angle of the zoom lens in the full field of view at the wide-angle end is CRAm; where: 0.420≤TTLS / TTL≤0.424; 8.460°≤CRAm≤11.900°.

[0101] The maximum principal ray angle is the largest angle between the principal ray from the outermost edge of the lens's field of view (full field of view) and the optical axis on a specified image plane (such as the effective imaging area of ​​the sensor (photosensitive chip)). This angle can be used to characterize the lens's "convergence / divergence" of incident light, directly affecting the light received at the sensor's edge and the coverage of the available field of view.

[0102] This embodiment controls the ratio of the distance from the vertex of the first lens 101 to the aperture stop 201 (TTLS) to the total optical length (TTL) of the zoom lens at the wide-angle end. This compresses the overall aperture and balances the optical power of the front and rear lens groups, thus correcting aberrations. Simultaneously, by controlling the maximum principal ray angle of the zoom lens across the entire field of view at the wide-angle end, lens-chip matching is ensured, preventing imaging problems such as vignetting. This improves the image quality of the zoom lens while maintaining a compact structure.

[0103] Reference Figure 1 Optionally, the zoom lens also includes a filter 202, which is disposed on the image-side side of the tenth lens 110. Specifically, by placing the filter 202 between the tenth lens 110 and the image plane (IMA), unwanted stray light can be filtered out, thereby improving the image quality of the zoom lens.

[0104] In summary, the zoom lens provided by this invention adopts a dual-group structure, specifically using a combination of 4 glass spherical lenses and 6 plastic aspherical lenses. By rationally allocating the optical power of each lens and rationally setting the surface shape of each lens, a zoom lens with small size, low cost, large aperture, high image quality, and full-band confocal resolution in the 436nm-850nm wavelength range is achieved. The total optical length is less than 34mm, it can be used with 1 / 2.7" image sensors, and it has excellent resolution in both high and low temperature environments.

[0105] For example, Table 1 details the specific optical physical parameters of each lens in the zoom lens provided in Embodiment 1 of the present invention, according to a feasible implementation. The zoom lens in Table 1 corresponds to... Figure 1 and Figure 2 The zoom lens shown.

[0106] Table 1 Design values ​​of optical physical parameters for zoom lenses

[0107]

[0108] The surface number is determined by the order of the lenses. For example, surface number "1" represents the object side of the first lens, surface number "2" represents the image side of the first lens, and so on. "STO" represents the aperture stop of the lens. The radius of curvature represents the curvature of the lens surface. A positive value means that the surface bends towards the object side with the center closer to the image side, and a negative value means that the surface bends towards the image side with the center closer to the object side. The radius of curvature of the plane is infinite (infinity, abbreviated as "Inf" in the table). The thickness represents the axial distance between the center of the current surface and the next surface. The material (nd) represents the refractive index, which is the ability of the material between the current surface and the next surface to deflect light. A blank space indicates that the current position is air with a refractive index of 1. The material (vd) represents the Abbe number, which is the dispersion characteristic of the material between the current surface and the next surface. A blank space indicates that the current position is air.

[0109] Table 2 represents the zoom interval values ​​in Table 1.

[0110] Table 2 Design values ​​for zoom interval at the wide-angle and telephoto ends of zoom lenses

[0111]

[0112] In this embodiment, the second lens 102, the third lens 103, the fifth lens 105, the sixth lens 106, the ninth lens 109, and the tenth lens 110 are aspherical lenses.

[0113] The surface shape of an aspherical lens satisfies the following formula:

[0114]

[0115] Where Z represents the sag of the aspherical surface; r represents the radial coordinate perpendicular to the optical axis; c represents the curvature of the fitted sphere, which is numerically the reciprocal of the radius of curvature; k represents the conic section constant; and A, B, C, D, E, and F represent the 4th, 6th, 8th, 10th, 12th, and 14th order coefficients of the aspherical polynomial, respectively.

[0116] For example, Table 3 details the aspherical coefficients of each lens in this embodiment one by way of a feasible implementation.

[0117] Table 3 Design values ​​of aspherical coefficients for various lenses in zoom lenses

[0118]

[0119] Where -3.35551912718305E-03 indicates that the coefficient A of surface number 3 is -3.35551912718305 * 10 -3 And so on.

[0120] The zoom lens provided in this embodiment achieves the following technical specifications:

[0121] Table 4 Technical Specifications of Zoom Lenses

[0122]

[0123] Furthermore, Figure 3 This refers to the transverse chromatic aberration curve of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention, specifically the transverse chromatic aberration curve at an infinity object distance. Figure 3 In the diagram, the vertical axis represents the field of view, 0 indicates the optical axis, and the vertex of the vertical axis represents the maximum image height; the dominant wavelength is 546 nm, and the horizontal axis represents the offset relative to the dominant wavelength, in micrometers. ).Depend on Figure 3 It can be seen that the chromatic aberration along the vertical axis is controlled within a small range for different wavelengths, indicating that the zoom lens has good control over the chromatic aberration along the vertical axis at the wide-angle end, which can meet the application requirements under normal conditions.

[0124] Figure 4 This is a ray fan diagram of a zoom lens at the wide-angle end, provided in Embodiment 1 of the present invention. Specifically, it is a ray fan diagram at the wide-angle end, at infinity object distance, and under different fields of view. In a single image, the horizontal axis represents the normalized beam aperture in the x and y directions, and the vertical axis represents the transverse aberration. Ideally, each curve should completely coincide with the horizontal axis, at which point all rays in that field of view are focused at the same point on the image plane. The vertical axis in a single image can also represent the maximum dispersion range of the beam on the ideal image plane. The ray fan diagram can reflect not only monochromatic aberrations of different wavelengths but also the magnitude of transverse chromatic aberration. Figure 4It can be seen that this zoom lens does not have obvious abrupt changes in the wavelengths of visible light and infrared at the wide-angle end, and the curves of each color do not have obvious dispersion. This indicates that this zoom optical system also has good correction for chromatic aberration and transverse aberration at the wide-angle end, which meets the usage requirements of this zoom optical system.

[0125] Figure 5 This is the axial aberration curve of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention. The axial aberration curve of the lens can better represent the state of parameters such as spherical aberration of the optical system under different wavelength conditions, such as... Figure 5 As shown in the figure, the vertical direction represents the normalized aperture, 0 indicates it is on the optical axis, and the vertex represents the maximum pupil radius; the dominant wavelength is 546nm, and the horizontal direction represents the offset relative to the dominant wavelength, in millimeters (mm). Figure 5 It can be seen that the axial aberrations of different wavelengths are all within a reasonable range across the entire normalized aperture, and there is no obvious color difference between visible light and infrared light, achieving the effect of forming a clear image across the entire wavelength range.

[0126] Figure 6 This refers to the transverse chromatic aberration curve of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention, which is derived from... Figure 6 It can be seen that the transverse chromatic aberration of different wavelengths is controlled within a small range, indicating that the transverse chromatic aberration of the zoom optical system is well controlled at the telephoto end, which can meet the application requirements under normal conditions.

[0127] Figure 7 This is the ray fan pattern of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention, specifically the ray fan pattern at the telephoto end, at infinity object distance, and under different fields of view. Figure 7 It can be seen that at the telephoto end, there are no obvious abrupt changes in the wavelengths of visible light and infrared light; the curves of each color are also not obviously dispersed, indicating that this zoom optical system also has good correction for chromatic aberration and transverse aberration at the telephoto end, which meets the usage requirements of this zoom optical system.

[0128] Figure 8 This is the axial aberration curve of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention, which is derived from... Figure 8 It can be seen that this zoom lens has no obvious color difference between visible light and infrared light under full aperture, which meets the basic requirement of clear imaging at night and achieves the effect of clear image formation across the entire spectrum.

[0129] Example 2

[0130] Figure 9 This is a schematic diagram of the structure of a zoom lens at the wide-angle end according to Embodiment 2 of the present invention. Figure 10 This is a schematic diagram of the structure of a zoom lens at the telephoto end according to Embodiment 2 of the present invention, as shown below. Figure 9 and Figure 10As shown, the zoom lens provided by the present invention includes a focusing lens group G1, an aperture stop 201, and a zoom lens group G2 arranged sequentially along the optical axis from the object plane to the image plane; the focusing lens group G1 and the zoom lens group G2 are movable along the optical axis; the focusing lens group G1 has negative optical power, and the zoom lens group G2 has positive optical power; the focusing lens group G1 includes a first lens 101, a second lens 102, and a third lens 103 arranged sequentially along the optical axis from the object plane to the image plane; the zoom lens group G2 includes a fourth lens 104, a fifth lens 105, a sixth lens 106, and a seventh lens 103 arranged sequentially along the optical axis from the object plane to the image plane. Lens 107, eighth lens 108, ninth lens 109, and tenth lens 110; the first lens 101 is a negative optical power lens, the second lens 102 is a negative optical power lens, the third lens 103 is a positive optical power lens, the fourth lens 104 is a positive optical power lens, the fifth lens 105 is a positive optical power lens, the sixth lens 106 is a positive optical power lens, the seventh lens 107 is a negative optical power lens, the eighth lens 108 is a positive optical power lens, the ninth lens 109 is a negative optical power lens, and the tenth lens 110 is a positive optical power lens; the zoom lens contains 10 lenses with optical power.

[0131] The difference between this embodiment and Embodiment 1 above is that the optical power of the sixth lens 106 is positive optical power. In addition, the object-side surface of the first lens 101 is concave towards the object plane, and the image-side surface of the first lens 101 is concave towards the image plane. Other similarities can be referred to the description of the above embodiments, and will not be repeated here.

[0132] For example, Table 5 details the specific optical physical parameters of each lens in the zoom lens provided in Embodiment 2 of the present invention, according to a feasible implementation. The zoom lens in Table 5 corresponds to... Figure 9 and Figure 10 The zoom lens shown.

[0133] Table 5 Design values ​​of optical physical parameters for zoom lenses

[0134]

[0135] The surface number is determined by the order of the lenses. For example, surface number "1" represents the object side of the first lens, surface number "2" represents the image side of the first lens, and so on. "STO" represents the aperture stop of the lens. The radius of curvature represents the curvature of the lens surface. A positive value means that the surface bends towards the object side with the center closer to the image side, and a negative value means that the surface bends towards the image side with the center closer to the object side. The radius of curvature of the plane is infinite (infinity, abbreviated as "Inf" in the table). The thickness represents the axial distance between the center of the current surface and the next surface. The material (nd) represents the refractive index, which is the ability of the material between the current surface and the next surface to deflect light. A blank space indicates that the current position is air with a refractive index of 1. The material (vd) represents the Abbe number, which is the dispersion characteristic of the material between the current surface and the next surface. A blank space indicates that the current position is air.

[0136] Table 6 represents the zoom interval values ​​from Table 5.

[0137] Table 6 Design values ​​for zoom interval at the wide-angle and telephoto ends of zoom lenses

[0138]

[0139] For example, Table 7 details the aspherical coefficients of each lens in this second embodiment with a feasible implementation.

[0140] Table 7 Design values ​​of aspherical coefficients for various lenses in zoom lenses

[0141]

[0142] Where -3.22728079547809E-03 indicates that the coefficient A of face number 3 is -3.22728079547809 * 10 -3 And so on.

[0143] The zoom lens provided in this embodiment achieves the following technical specifications:

[0144] Table 8 Technical Specifications of Zoom Lenses

[0145]

[0146] Figure 11 This is the transverse chromatic aberration curve of the zoom lens at the wide-angle end provided in Embodiment 2 of the present invention, which is derived from... Figure 11 It can be seen that the chromatic aberration along the vertical axis is controlled within a small range for different wavelengths, indicating that the zoom lens has good control over the chromatic aberration along the vertical axis at the wide-angle end, which can meet the application requirements under normal conditions.

[0147] Figure 12This is the ray fan pattern of the zoom lens at the wide-angle end provided in Embodiment 2 of the present invention, which is... Figure 12 It can be seen that the wavelengths of this zoom optical system are well close to the horizontal axis in each field of view at the wide-angle end, indicating that the transverse aberration and chromatic aberration of each wavelength are well corrected, which meets the usage requirements of this zoom optical system.

[0148] Figure 13 This is the axial aberration curve of the zoom lens at the wide-angle end provided in Embodiment 2 of the present invention, which is... Figure 13 It can be seen that the axial aberrations of different wavelengths are all within a reasonable range across the entire normalized aperture, and there is no obvious color difference between visible light and infrared light, thus achieving the effect of forming a clear image across the entire wavelength range.

[0149] Figure 14 This is the transverse chromatic aberration curve of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention, which is... Figure 14 It can be seen that the transverse chromatic aberration of different wavelengths is controlled within a small range, indicating that the transverse chromatic aberration of the zoom optical system is well controlled at the telephoto end, which can meet the application requirements under normal conditions.

[0150] Figure 15 This is the ray fan pattern of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention, which is... Figure 15 It can be seen that at the telephoto end, there are no obvious abrupt changes in the wavelengths of visible light and infrared light; the curves of each color are also not obviously dispersed, indicating that this zoom optical system also has good correction for chromatic aberration and transverse aberration at the telephoto end, which meets the usage requirements of this zoom optical system.

[0151] Figure 16 This is the axial aberration curve of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention, which is... Figure 16 As can be seen, this zoom lens exhibits no significant color difference between visible and infrared light under full illumination, meeting the basic requirement for clear nighttime imaging and achieving clear images across the entire spectrum.

[0152] Example 3

[0153] Figure 17 This is a schematic diagram of the structure of a zoom lens at the wide-angle end according to Embodiment 3 of the present invention. Figure 18 This is a schematic diagram of the structure of a zoom lens at the telephoto end according to Embodiment 3 of the present invention, as shown below. Figure 17 and Figure 18As shown, the zoom lens provided by the present invention includes a focusing lens group G1, an aperture stop 201, and a zoom lens group G2 arranged sequentially along the optical axis from the object plane to the image plane; the focusing lens group G1 and the zoom lens group G2 are movable along the optical axis; the focusing lens group G1 has negative optical power, and the zoom lens group G2 has positive optical power; the focusing lens group G1 includes a first lens 101, a second lens 102, and a third lens 103 arranged sequentially along the optical axis from the object plane to the image plane; the zoom lens group G2 includes a fourth lens 104, a fifth lens 105, a sixth lens 106, and a seventh lens 103 arranged sequentially along the optical axis from the object plane to the image plane. Lens 107, eighth lens 108, ninth lens 109, and tenth lens 110; the first lens 101 is a negative optical power lens, the second lens 102 is a negative optical power lens, the third lens 103 is a positive optical power lens, the fourth lens 104 is a positive optical power lens, the fifth lens 105 is a positive optical power lens, the sixth lens 106 is a negative optical power lens, the seventh lens 107 is a negative optical power lens, the eighth lens 108 is a positive optical power lens, the ninth lens 109 is a negative optical power lens, and the tenth lens 110 is a positive optical power lens; the zoom lens contains 10 lenses with optical power.

[0154] The difference between this embodiment and Embodiment 1 above is that the object-side surface of the second lens 102 is concave towards the object plane, and the image-side surface of the second lens 102 is concave towards the image plane. Other similarities can be found in the description of the above embodiments, and will not be repeated here.

[0155] For example, Table 9 details the specific optical physical parameters of each lens in the zoom lens provided in Embodiment 3 of the present invention, according to a feasible implementation. The zoom lens in Table 9 corresponds to... Figure 17 and Figure 18 The zoom lens shown.

[0156] In Table 9, the surface numbers are assigned according to the surface order of each lens. For example, surface number "1" represents the object side of the first lens, surface number "2" represents the image side of the first lens, and so on. "STO" represents the aperture stop of the lens. The radius of curvature represents the curvature of the lens surface. A positive value means that the surface bends towards the object side with the center closer to the image side, and a negative value means that the surface bends towards the image side with the center closer to the object side. The radius of curvature of the plane is infinite (infinity, abbreviated as "Inf" in the table). The thickness represents the axial distance between the center of the current surface and the next surface. The material (nd) represents the refractive index, that is, the ability of the material between the current surface and the next surface to deflect light. A blank space indicates that the current position is air with a refractive index of 1. The material (vd) represents the Abbe number, that is, the dispersion characteristic of the material between the current surface and the next surface to light. A blank space indicates that the current position is air.

[0157] Table 9 Design values ​​of optical physical parameters for zoom lenses

[0158]

[0159] Table 10 shows the zoom interval values ​​in Table 9.

[0160] Table 10 Design values ​​for zoom interval at the wide-angle and telephoto ends of zoom lenses

[0161]

[0162] For example, Table 11 details the aspherical coefficients of each lens in this embodiment three according to a feasible implementation.

[0163] Table 11 Design values ​​of aspherical coefficients for various lenses in zoom lenses

[0164]

[0165] Where -3.25216102806839E-03 indicates that the coefficient A of face number 3 is -3.25216102806839*10 -3 And so on.

[0166] The zoom lens provided in this embodiment achieves the following technical specifications:

[0167] Table 12 Technical Specifications of Zoom Lenses

[0168]

[0169] Figure 19 This refers to the transverse chromatic aberration curve of the zoom lens at the wide-angle end provided in Embodiment 3 of the present invention, which is derived from... Figure 19 It can be seen that the chromatic aberration along the vertical axis is controlled within a small range for different wavelengths, indicating that the zoom lens has good control over the chromatic aberration along the vertical axis at the wide-angle end, which can meet the application requirements under normal conditions.

[0170] Figure 20 This is the ray fan pattern of the zoom lens at the wide-angle end provided in Embodiment 3 of the present invention, which is... Figure 20 It can be seen that this zoom lens does not exhibit significant abrupt changes in visible light and infrared wavelengths at the wide-angle end, nor does it show significant dispersion in the curves of various colors. This indicates that the zoom optical system also provides good correction for chromatic aberration and transverse aberration at the wide-angle end, meeting the usage requirements of this zoom optical system.

[0171] Figure 21 This is the axial aberration curve of the zoom lens at the wide-angle end provided in Embodiment 3 of the present invention, which is derived from... Figure 21 It can be seen that the axial aberrations of different wavelengths are all within a reasonable range across the entire normalized aperture, and there is no obvious color difference between visible light and infrared light, achieving the effect of forming a clear image across the entire wavelength range.

[0172] Figure 22 This refers to the transverse chromatic aberration curve of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention, which is derived from... Figure 22 It can be seen that the transverse chromatic aberration of different wavelengths is controlled within a small range, indicating that the transverse chromatic aberration of the zoom optical system is well controlled at the telephoto end, which can meet the application requirements under normal conditions.

[0173] Figure 23 This is the ray fan pattern of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention, which is... Figure 23 It can be seen that at the telephoto end, there are no obvious abrupt changes in the wavelengths of visible light and infrared light; the curves of each color are also not obviously dispersed, indicating that this zoom optical system also has good correction for chromatic aberration and transverse aberration at the telephoto end, which meets the usage requirements of this zoom optical system.

[0174] Figure 24 This is the axial aberration curve of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention, which is... Figure 24 It can be seen that this zoom lens has no obvious color difference between visible light and infrared light under full aperture, which meets the basic requirement of clear imaging at night and achieves the effect of clear image formation across the entire spectrum.

[0175] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A zoom lens, characterized in that, It includes a focusing lens group, an aperture stop, and a zoom lens group arranged sequentially from the object plane to the image plane along the optical axis; the focusing lens group and the zoom lens group are movable along the optical axis. The focusing lens group has negative optical power, and the zoom lens group has positive optical power; The focusing lens group includes a first lens, a second lens, and a third lens arranged sequentially from the object plane to the image plane along the optical axis; the zoom lens group includes a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged sequentially from the object plane to the image plane along the optical axis. The first lens is a negative power lens, the second lens is a negative power lens, the third lens is a positive power lens, the fourth lens is a positive power lens, the fifth lens is a positive power lens, the sixth lens is a positive or negative power lens, the seventh lens is a negative power lens, the eighth lens is a positive power lens, the ninth lens is a negative power lens, and the tenth lens is a positive power lens. The zoom lens has 10 lenses with optical power. The maximum movable distance along the optical axis of the focusing lens group is S1; the maximum movable distance along the optical axis of the zoom lens group is S2; when the zoom lens is at the wide-angle end, the distance from the center of the optical axis of the object surface of the first lens to the image plane is TTL; when the zoom lens is at the wide-angle end, the distance from the center of the optical axis of the image surface of the tenth lens to the image plane is BFLW; wherein: 0.121≤S2 / TTL≤0.156, 0.715≤S1 / BFLW≤0.

836.

2. The zoom lens according to claim 1, characterized in that, The first lens, the fourth lens, the seventh lens, and the eighth lens are all glass spherical lenses; The second lens, the third lens, the fifth lens, the sixth lens, the ninth lens, and the tenth lens are all plastic aspherical lenses.

3. The zoom lens according to claim 1, characterized in that, The surface of the lens adjacent to the object plane is the object-side surface, and the surface of the lens adjacent to the image plane is the image-side surface; the lens includes a paraxial region, and in the zoom lens, at least in the paraxial region, the following conditions are met: The object-side surface of the first lens protrudes towards the object plane, and the image-side surface of the first lens is recessed towards the image plane; or, the object-side surface of the first lens is recessed towards the object plane, and the image-side surface of the first lens is recessed towards the image plane. The object-side surface of the second lens is recessed toward the object plane, and the image-side surface of the second lens is recessed toward the image plane; Alternatively, the object-side surface of the second lens protrudes towards the object plane, and the image-side surface of the second lens is recessed towards the image plane; The object-side surface of the third lens bulges towards the object plane, and the image-side surface of the third lens bulges towards the image plane; The object-side surface of the fourth lens bulges towards the object plane, and the image-side surface of the fourth lens bulges towards the image plane; The object-side surface of the fifth lens bulges towards the object plane, and the image-side surface of the fifth lens is recessed towards the image plane; The object-side surface of the sixth lens bulges towards the object plane, and the image-side surface of the sixth lens is recessed towards the image plane. The object-side surface of the seventh lens bulges towards the object plane, and the image-side surface of the seventh lens is recessed towards the image plane. The object-side surface of the eighth lens bulges towards the object plane, and the image-side surface of the eighth lens bulges towards the image plane; The object-side surface of the ninth lens is recessed towards the object plane, and the image-side surface of the ninth lens is convex towards the image plane. The object-side surface of the tenth lens bulges towards the object plane, and the image-side surface of the tenth lens is recessed towards the image plane.

4. The zoom lens according to claim 1, characterized in that, The focal length of the focusing lens group is F1, the focal length of the zoom lens group is F2, and the focal length of the zoom lens at the wide-angle end is FW, wherein: -2.515≤F1 / FW≤-2.170; 2.219≤F2 / FW≤2.

294.

5. The zoom lens according to claim 1, characterized in that, The seventh lens and the eighth lens form a cemented lens group; the focal length of the cemented lens group is F78, and the focal length of the zoom lens group is F2, wherein: 3.078≤F78 / F2≤9.

391.

6. The zoom lens according to claim 1, characterized in that, The zoom lens has a focal length of FW at the wide-angle end and a focal length of FT at the telephoto end, wherein: 2.18≤FT / FW≤2.

27.

7. The zoom lens according to claim 1, characterized in that, The refractive index of the fourth lens is Nd4, and the Abbe number of the fourth lens is Vd4, wherein: 1.497≤Nd4≤1.593; 68.342≤Vd4≤81.

608.

8. The zoom lens according to claim 1, characterized in that, When the zoom lens is at the wide-angle end, the distance from the center of the optical axis of the object surface of the first lens to the image plane is TTL; the entrance pupil diameter of the zoom lens at the wide-angle end is EPD; the distance between the incident ray corresponding to the maximum image height and the vertex of the first lens in the perpendicular direction is L1; the radius of curvature of the object surface of the first lens is R1, and the radius of curvature of the image surface of the first lens is R2, wherein: 12.368≤TTL / EPD≤12.894; 0.105≤L1 / TTL≤0.108; 0.892≤(R1+R2) / (R1-R2)≤1.

231.

9. The zoom lens according to claim 1, characterized in that, When the zoom lens is at the wide-angle end, the distance from the center of the optical axis of the object surface of the first lens to the aperture stop is TTLS; when the zoom lens is at the wide-angle end, the distance from the center of the optical axis of the object surface of the first lens to the image plane is TTL; the maximum principal ray angle of the zoom lens in the full field of view at the wide-angle end is CRAm; wherein: 0.420≤TTLS / TTL ≤0.424; 8.460°≤CRAm≤11.900°.

Images