Lens and camera device

Abstract

The present invention belongs to the field of imaging technology, and more specifically, relates to a lens and an imaging device, comprising a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group, which are sequentially arranged along an optical axis from the object side to the image side. The first lens group, the third lens group, and the fourth lens group have positive focal lengths, and the second lens group and the fifth lens group have negative focal lengths. The first lens group, the third lens group, and the fifth lens group are fixed relative to the image plane, and the second lens group and the fourth lens group are capable of reciprocating along the optical axis. The lens satisfies the following relationships: 0.8≤|F2 / FW|≤1.25; ‑8≤F1 / F2≤‑5; 2≤F3 / FW≤6; ‑0.8≤F2 / F4≤‑0.35; and 0.96≤BF / (FW*tanω)<1.8. The lens provided by the present invention has good optical performance, can also ensure a wide-angle field of view and miniaturization of the lens.

Description

Technical Field

[0001] The present invention belongs to the field of camera technology, and more particularly, relates to a lens and a camera device. Background Art

[0002] In the field of zoom lenses, a zoom structure in which the front group and other groups are linked is generally used. However, this structure is relatively complex, and the extension and retraction of the front group results in the loss of functions such as dust resistance, drip resistance, and weather resistance of the lens. Therefore, for zoom lenses composed of four or more lens groups, the full length of the lens is generally fixed, and zooming is achieved by relative movement between the lens groups between the object side and the image side.

[0003] Although this method has a simple structure and is relatively easy to miniaturize the lens, when the lens is applied to a large target surface, such as M4 / 3 or even a full-frame target surface (the corresponding lens field of view is between 55° and 75°), especially when the field of view at the wide-angle end exceeds 60°, in order to ensure that the optical system has good aberration compensation and good optical performance in the entire zoom range, the outer diameter of the front lens group needs to be made very large, resulting in an increase in the overall length of the lens, making it difficult to miniaturize the lens. Summary of the Invention

[0004] The object of the present invention is to provide a lens and a camera device to solve the technical problem that it is difficult to miniaturize the existing lens in order to ensure that the optical system has good aberration compensation and good optical performance in the entire zoom range.

[0005] To achieve the above object, the present invention adopts a technical solution as follows: providing a lens, comprising a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group, arranged in sequence along an optical axis from the object side to the image side, wherein the first lens group, the third lens group, and the fourth lens group have positive refractive power, and the second lens group and the fifth lens group have negative refractive power; the first lens group, the third lens group, and the fifth lens group are fixed relative to an image plane, and the second lens group and the fourth lens group are capable of reciprocating along the optical axis;

[0006] The lens satisfies the following relationship:

[0007] 0.8≤|F2 / FW|≤1.25;

[0008] -8≤F1 / F2≤-5;

[0009] 2≤F3 / FW≤6;

[0010] -0.8≤F2 / F4≤-0.35;

[0011] 0.96≤BF / (FW*tanω)<1.8;

[0012] Wherein, F1 represents the composite focal length of the first lens group, F2 represents the composite focal length of the second lens group, F3 represents the composite focal length of the third lens group, F4 represents the composite focal length of the fourth lens group, FW represents the composite focal length of the lens, BF represents the distance from the image side of the most image side lens to the image plane, and ω represents the maximum half-field angle of view of the lens.

[0013] Furthermore, the lens satisfies the following relationship: 0.85≤|F2 / FW|≤1.

[0014] Furthermore, the lens satisfies the following relationship: 3≤F3 / FW≤5.

[0015] Furthermore, the lens satisfies the following relationship: -0.6≤F2 / F4≤-0.4.

[0016] Furthermore, the lens satisfies the following relationship: 1.25≤BF / (FW*tanω)<1.55.

[0017] Furthermore, the fourth lens group and the fifth lens group each include at least two positive lenses, and the fourth lens group and the fifth lens group satisfy the following relationship:

[0018] V d4 ≥63.39;

[0019] V d5 ≥59.5;

[0020] Among them, V d4 represents the average Abbe number of all positive lenses in the fourth lens group, V d5 represents the average Abbe number of all positive lenses in the fifth lens group.

[0021] Furthermore, the fourth lens group and the fifth lens group simultaneously satisfy the following relationship:

[0022] V d45 ≥63.39;

[0023] Among them, V d45 represents the average Abbe number of all positive lenses in the fourth lens group and all positive lenses in the fifth lens group.

[0024] Furthermore, the lens further includes an aperture, a central axis of the aperture coincides with the optical axis, and the aperture is arranged between the second lens group and the third lens group.

[0025] The present invention also provides a camera device comprising the aforementioned lens.

[0026] Compared with the prior art, the lens provided by the present invention can effectively correct the spherical aberration and image curvature of the lens, thereby ensuring good optical performance of the lens, and can also ensure the wide-angle field of view of the lens and the miniaturization of the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A schematic structural diagram of a lens provided by an embodiment of the present invention when in a wide-angle state;

[0029] Figure 2 A schematic structural diagram of a lens provided by an embodiment of the present invention when in an intermediate state;

[0030] Figure 3 A schematic diagram of the structure of the lens provided by an embodiment of the present invention when in a telephoto state;

[0031] Figure 4 A graph showing the longitudinal spherical aberration of the lens provided by the first embodiment of the present invention when in a wide-angle state;

[0032] Figure 5 A longitudinal spherical aberration curve diagram of the lens provided by the first embodiment of the present invention when it is in an intermediate state;

[0033] Figure 6 A longitudinal spherical aberration curve diagram of the lens provided by the first embodiment of the present invention when in a telephoto state;

[0034] Figure 7 An astigmatism curve diagram of the lens provided by the first embodiment of the present invention when in a wide-angle state;

[0035] Figure 8 An astigmatism curve diagram of the lens provided by the first embodiment of the present invention when it is in an intermediate state;

[0036] Figure 9 An astigmatism curve diagram of the lens provided by the first embodiment of the present invention when in a telephoto state;

[0037] Figure 10A distortion curve diagram of the lens provided by the first embodiment of the present invention when in a wide-angle state;

[0038] Figure 11 A distortion curve diagram of the lens provided by the first embodiment of the present invention when it is in an intermediate state;

[0039] Figure 12 A distortion curve diagram of the lens provided by the first embodiment of the present invention when in telephoto state;

[0040] Figure 13 A graph showing the longitudinal spherical aberration of the lens provided in the second embodiment of the present invention when in a wide-angle state;

[0041] Figure 14 A longitudinal spherical aberration curve diagram of the lens provided by the second embodiment of the present invention when it is in an intermediate state;

[0042] Figure 15 A longitudinal spherical aberration curve diagram of the lens provided by the second embodiment of the present invention when in a telephoto state;

[0043] Figure 16 An astigmatism curve diagram of the lens provided by the second embodiment of the present invention when in a wide-angle state;

[0044] Figure 17 An astigmatism curve diagram of the lens provided by the second embodiment of the present invention when it is in an intermediate state;

[0045] Figure 18 An astigmatism curve diagram of the lens provided by the second embodiment of the present invention when in a telephoto state;

[0046] Figure 19 A distortion curve diagram of the lens provided in the second embodiment of the present invention when in a wide-angle state;

[0047] Figure 20 A distortion curve diagram of the lens provided in the second embodiment of the present invention when it is in an intermediate state;

[0048] Figure 21 A distortion curve diagram of the lens provided by the second embodiment of the present invention when in telephoto state;

[0049] Figure 22 A graph showing the longitudinal spherical aberration of the lens provided in the third embodiment of the present invention when in a wide-angle state;

[0050] Figure 23 A longitudinal spherical aberration curve diagram of the lens provided by the third embodiment of the present invention when it is in an intermediate state;

[0051] Figure 24 A graph showing the longitudinal spherical aberration of the lens provided in the third embodiment of the present invention when the lens is in a telephoto state;

[0052] Figure 25 An astigmatism curve diagram of the lens provided by the third embodiment of the present invention when in a wide-angle state;

[0053] Figure 26 Astigmatism curve diagram of the lens provided by the third embodiment of the present invention when it is in an intermediate state;

[0054] Figure 27 Astigmatism curve diagram of the lens provided by the third embodiment of the present invention when in telephoto state;

[0055] Figure 28 A distortion curve diagram of the lens provided in the third first embodiment of the present invention when in a wide-angle state;

[0056] Figure 29 A distortion curve diagram of the lens provided in the third embodiment of the present invention when it is in an intermediate state;

[0057] Figure 30 This is a distortion curve diagram of the lens provided by the third embodiment of the present invention when it is in the telephoto state. DETAILED DESCRIPTION

[0058] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0059] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0060] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0062] See also Figure 1 、 Figure 2 and Figure 3 The lens provided by the present invention is now described. The lens includes a first lens group LG1, a second lens group LG2, a third lens group LG3, a fourth lens group LG4, and a fifth lens group LG5, which are arranged in sequence along the optical axis from the object side to the image side. The first lens group LG1, the third lens group LG3, and the fourth lens group LG4 have positive focal power, and the second lens group LG2 and the fifth lens group LG5 have negative focal power.

[0063] The first lens group LG1, the third lens group LG3 and the fifth lens group LG5 are fixed relative to the image plane IMG, and the second lens group LG2 and the fourth lens group LG4 can reciprocate along the optical axis;

[0064] The lens meets the following conditions:

[0065] Condition (1) 0.8≤|F2 / FW|≤1.25;

[0066] Condition (2) -8≤F1 / F2≤-5;

[0067] Condition (3) 2≤F3 / FW≤6;

[0068] Condition (4) -0.8≤F2 / F4≤-0.35;

[0069] Condition (5) 0.96≤BF / (FW*tanω)<1.8;

[0070] Among them, F1 represents the composite focal length of the first lens group LG1, F2 represents the composite focal length of the second lens group LG2, F3 represents the composite focal length of the third lens group LG3, F4 represents the composite focal length of the fourth lens group LG4, FW represents the composite focal length of the lens, BF represents the distance from the image side of the most image side lens to the image plane IMG, and ω represents the maximum half-field angle of view of the lens.

[0071] Specifically, the positions of the first lens group LG1, the third lens group LG3, and the fifth lens group LG5 are fixed. The lens can be zoomed by moving the second lens group LG2 and the fourth lens group LG4 along the optical axis. This avoids the loss of dust resistance, drip resistance, and weather resistance due to the expansion and contraction of the front lens group. The second lens group LG2 moves between the first lens group LG1 and the third lens group LG3. The second lens group LG2 can move closer to the first lens group LG1 and away from the third lens group LG3, or closer to the third lens group LG3 and away from the first lens group LG1. The second lens group LG2 moves along the optical axis to achieve zoom. Therefore, the second lens group LG2 can also be referred to as the zoom group. Correspondingly, the fourth lens group LG4 can move closer to the third lens group LG3 and away from the fifth lens group LG5, or away from the third lens group LG3 and closer to the fifth lens group LG5. Compensation is achieved by moving the fourth lens group LG4 along the optical axis, or when focusing on the movement of the object, the fourth lens group LG4 can be fine-tuned to make the captured video more focused. Therefore, the fourth lens group LG4 can also be referred to as the focus group, which achieves the focusing function.

[0072] The above condition (1) reasonably configures the absolute value range of the ratio of the composite focal length of the second lens group LG2 to the composite focal length of the lens. When the absolute value of the ratio of the composite focal length of the second lens group LG2 to the composite focal length of the lens satisfies condition (1), the lens can achieve good optical performance and can also take into account the miniaturization of the lens. The above condition (2) reasonably configures the ratio range of the composite focal length of the first lens group LG1 to the composite focal length of the second lens group LG2. When the ratio of the composite focal length of the first lens group LG1 to the composite focal length of the second lens group LG2 satisfies condition (2), the spherical aberration of the lens can be well corrected, and the wide-angle end of the lens can also obtain a higher aperture ratio, so that the lens has excellent resolution performance while taking into account the lens volume. The above condition (3) reasonably configures the ratio range of the synthetic focal length of the third lens group LG3 to the synthetic focal length of the lens. When the ratio of the synthetic focal length of the third lens group LG3 to the synthetic focal length of the lens meets condition (3), the spherical aberration of the lens can be well corrected, so that the lens has good optical performance. The above condition (4) reasonably configures the ratio range of the synthetic focal length of the second lens group LG2 to the synthetic focal length of the fourth lens group LG4. When the ratio of the synthetic focal length of the second lens group LG2 to the synthetic focal length of the fourth lens group LG4 meets condition (4), the fourth lens group LG4 can well correct the image curvature generated by the lens zooming from the wide-angle end to the telephoto end, so that the lens can have good optical performance. The above condition (5) reasonably configures the ratio range of the back focal length of the lens to the actual image height. When the ratio of the back focal length of the lens to the actual image height meets condition (5), it can ensure both the wide-angle end field of view of the lens and the miniaturization of the lens.

[0073] Compared with the prior art, the lens provided by the present invention can reasonably configure the ratio of the synthetic focal length of the second lens group LG2 to the synthetic focal length of the lens, the ratio of the synthetic focal length of the first lens group LG1 to the synthetic focal length of the second lens group LG2, the ratio of the synthetic focal length of the third lens group LG3 to the synthetic focal length of the lens, the ratio of the synthetic focal length of the second lens group LG2 to the synthetic focal length of the fourth lens group LG4, and the ratio of the back focal length of the lens to the actual image height. Therefore, not only can the spherical aberration and image curvature of the lens be well corrected, so that the lens has good optical performance, but also the field of view at the wide-angle end of the lens and the miniaturization of the lens can be guaranteed.

[0074] For the lens provided in this embodiment, when the absolute value of the ratio of the synthetic focal length of the second lens group LG2 to the synthetic focal length of the lens is lower than the lower limit of condition (1), the synthetic focal length of the second lens group LG2 becomes shorter, and the resulting aberration correction and spherical aberration correction are more difficult, making it difficult to achieve good optical performance of the lens; at the same time, the lens length will increase, making it difficult to achieve miniaturization of the lens; when the absolute value of the ratio of the synthetic focal length of the second lens group LG2 to the synthetic focal length of the lens is higher than the upper limit of condition (1), the synthetic focal length of the second lens group LG2 becomes longer, and when the second lens group LG2 moves along the optical axis to achieve zooming, the moving distance of the second lens group LG2 will increase, causing the correction movement amount of the fourth lens group at the telephoto end to increase. At the same time, the outer diameter of the first lens group will also increase, making it difficult to achieve aberration correction and miniaturization of the lens. Preferably, 0.85≤|F2 / FW|≤1.

[0075] When the ratio of the composite focal length of the first lens group LG1 to the composite focal length of the second lens group LG2 is lower than the lower limit of condition (2), the optical power of the first lens group LG1 becomes relatively weak, the lens length will increase, and at the same time, spherical aberration correction will be more difficult, making it difficult to achieve good optical performance of the lens; when the ratio of the composite focal length of the first lens group LG1 to the composite focal length of the second lens group LG2 is higher than the upper limit of condition (2), the optical power of the first lens group LG1 becomes relatively strong, the spherical aberration correction will be excessive, making it difficult to maintain good optical performance of the lens.

[0076] When the ratio of the composite focal length of the third lens group LG3 to the composite focal length of the lens is lower than the lower limit of condition (3), the optical power of the third lens group LG3 becomes relatively strong, resulting in excessive spherical aberration correction and difficulty in coma correction, making it difficult to achieve good optical performance. At the same time, the eccentricity of the third lens group is increased, which is not conducive to assembly accuracy and yield rate; when the ratio of the composite focal length of the third lens group LG3 to the composite focal length of the lens is higher than the upper limit of condition (3), the optical power of the third lens group LG3 becomes relatively weak, spherical aberration correction is insufficient, and the total length of the lens increases, which is not conducive to miniaturization of the lens. Preferably, 3≤F3 / FW≤5.

[0077] When the ratio of the composite focal length of the second lens group LG2 to the composite focal length of the fourth lens group LG4 is lower than the lower limit of condition (4), the optical focal length of the second lens group LG2 becomes relatively weaker and the image curvature becomes smaller, but the total length of the lens will increase, which is not conducive to the miniaturization of the lens; when the ratio of the composite focal length of the second lens group LG2 to the composite focal length of the fourth lens group LG4 is higher than the upper limit of condition (4), the optical focal length of the second lens group LG2 becomes relatively stronger and the image curvature becomes larger, which makes it difficult to correct the aberration of the fourth lens group LG4.

[0078] Condition (5) is used to limit the ratio of the back focal length of the lens to the actual image height. When the ratio of the back focal length of the lens to the actual image height is lower than the lower limit of condition (5), while ensuring the field of view of the lens at the wide-angle end, the back focal length of the lens will become too short to be used on a specific camera. Conversely, when the back focal length of the lens can meet the use of a specific camera, the field of view of the lens at the wide-angle end will become smaller. When the ratio of the back focal length of the lens to the actual image height is higher than the upper limit of condition (5), while ensuring the field of view of the lens at the wide-angle end, the back focal length of the lens will become longer, which is not conducive to the miniaturization of the lens. Preferably, 1.25≤BF / (FW*tanω)<1.55.

[0079] Because aspheric surfaces effectively eliminate aberrations and improve imaging quality, they also facilitate miniaturization, enabling lenses to maintain compactness while maintaining excellent optical performance. The second lens group LG2 includes at least two negative lenses, at least one of which is aspheric. The third lens group LG3 includes a single positive lens, also an aspheric lens.

[0080] In one embodiment, the fourth lens group LG4 and the fifth lens group LG5 each include at least two positive lenses, and the fourth lens group LG4 and the fifth lens group LG5 meet the following conditions:

[0081] Condition (6)V d4 ≥63.39;

[0082] Condition (7)V d5 ≥59.5;

[0083] Among them, V d4 V is the average Abbe number of all positive lenses in the fourth lens group LG4. d5 Represents the average Abbe number of all positive lenses in the fifth lens group LG5.

[0084] The above conditions (6) and (7) respectively reasonably configure the average Abbe number of all positive lenses in the fourth lens group LG4 and the average Abbe number of all positive lenses in the fifth lens group LG5. The average Abbe number of all positive lenses in the fourth lens group LG4 determines the degree of correction of the position chromatic aberration and magnification chromatic aberration of the fourth lens group LG4, which is an important factor affecting the imaging performance of the lens. By limiting the average Abbe number of all positive lenses in the fourth lens group LG4 to be greater than or equal to 63.39, that is, satisfying condition (6), the imaging performance of the fourth lens group LG4 can be guaranteed. Similarly, the fifth lens group LG5 is also the same and will not be repeated here. Preferably, the fourth lens group LG4 and the fifth lens group LG5 satisfy the following conditions: V d4 ≥68.68; V d5 ≥71.26.

[0085] In one embodiment, the fourth lens group LG4 and the fifth lens group LG5 simultaneously satisfy the following conditions:

[0086] Condition (8)V d45 ≥63.39;

[0087] Among them, V d45 It represents the average Abbe number of all positive lenses in the fourth lens group LG4 and all positive lenses in the fifth lens group LG5.

[0088] The above condition (8) reasonably configures the average Abbe number of all positive lenses in the fourth lens group LG4 and all positive lenses in the fifth lens group LG5. When the lens meets condition (8), the position chromatic aberration and magnification chromatic aberration of the lens can be well corrected, so that the lens has good optical performance.

[0089] In one embodiment, the lens further includes a stop STO, whose central axis coincides with the optical axis. Stop STO is disposed between the second lens group LG2 and the third lens group LG3. Specifically, stop STO is an aperture stop STO, which is used to limit the amount of light entering the lens and also to suppress aberrations and stray light. Stop STO can be a separate light-blocking member mounted between the second lens group LG2 and the third lens group LG3, or it can be formed by a clamping member that secures the lens.

[0090] The present invention further provides a camera device including the lens as described above. Since the camera device provided by the embodiment of the present invention includes the lens in any of the above embodiments, it has all the beneficial effects of the above lenses, which will not be described in detail here.

[0091] The following describes several specific embodiments to illustrate the technical effects of the lens provided in this application.

[0092] Example 1

[0093] See also Figure 1 、 Figure 2 and Figure 3 , along the direction from the object side to the image side of the optical axis, the lens includes a first lens group LG1, a second lens group LG2, an aperture STO, a third lens group LG3, a fourth lens group LG4 and a fifth lens group LG5 which are arranged in sequence along the direction from the object side to the image side of the optical axis. The first lens group LG1, the third lens group LG3 and the fourth lens group LG4 have positive focal power, and the second lens group LG2 and the fifth lens group LG5 have negative focal power.

[0094] Of course, it is understandable that a protective glass CG for protecting the lens can be set between the fifth lens group LG5 and the image plane IMG, or various optical filters such as a low-pass filter and an infrared cut-off filter can be set. The specific settings can be selected according to actual needs.

[0095] In this embodiment, |F2 / FW|=1.053, F1 / F2=-7.269, F3 / FW=4.390, F2 / F4=-0.551, BF / (FW*tanω)=1.669, V d4 =68.710, V d5 =60.855, V d45 =64.783.

[0096] The first lens group LG1 includes a first lens L1 having negative refractive power, a second lens L2 having positive refractive power, and a third lens L3 having positive refractive power. The surface curvature of the first lens L1 facing the image side and the surface curvature of the second lens L2 facing the object side are the same. The first lens L1 and the second lens group LG2 form a first doublet lens B01, and the first doublet lens B01 has negative refractive power. Since a single lens with positive refractive power will produce negative spherical aberration, a single lens with negative refractive power will produce positive spherical aberration, the combination of the first lens L1 having negative refractive power and the second lens L2 having positive refractive power can correct spherical aberration and simultaneously make the lens structure more compact.

[0097] The object-side surface S1 of the first doublet lens B01 is convex at the near optical axis, the cemented surface S2 is convex at the near optical axis, and the image-side surface S3 is convex at the near optical axis. This convex object-side surface S1 of the first doublet lens B01 at the near optical axis facilitates light entering the first doublet lens B01 at a wider angle, thereby increasing the lens's field of view and effectively expanding the lens's shooting range, thus achieving the design requirement of wide-angle shooting. The object-side surface S4 of the third lens L3 is convex at the near optical axis, and the image-side surface S5 is convex at the near optical axis. Because third lens L3 has positive refractive power, light passing through the first doublet lens B01 is smoothly converged onto third lens L3, allowing third lens L3 to fully receive light incident on its object-side surface S4.

[0098] The second lens group LG2 includes a fourth lens element L4 with negative refractive power, a fifth lens element L5 with negative refractive power, a sixth lens element L6 with positive refractive power, and a seventh lens element L7 with negative refractive power. The object-side surface S6 of the fourth lens element L4 is convex at the near optical axis, and the image-side surface S7 is convex at the near optical axis. The object-side surface S8 of the fifth lens element L5 is concave at the near optical axis, and the image-side surface S9 is convex at the near optical axis. The object-side surface S10 of the sixth lens element L6 is convex at the near optical axis, and the image-side surface S11 is concave at the near optical axis. The object-side surface S12 of the seventh lens element L7 is concave at the near optical axis, and the image-side surface S13 is concave at the near optical axis.

[0099] The third lens group LG3 includes an eighth lens L8 having positive refractive power, with a stop STO located between the seventh lens L7 and the eighth lens L8. The object-side surface S15 of the eighth lens L8 is convex near the optical axis, and the image-side surface S16 is convex near the optical axis.

[0100] The fourth lens group LG4 includes a ninth lens element L9 having positive refractive power, a tenth lens element L10 having negative refractive power, and an eleventh lens element L11 having positive refractive power. The object-side surface S17 of the ninth lens element L9 is convex at the near optical axis, and the image-side surface S18 is concave at the near optical axis. The curvature of the image-side surface of the tenth lens element L10 is the same as the curvature of the object-side surface of the eleventh lens element L11. The tenth lens L10 and the eleventh lens L11 form a second cemented lens element B02, which has positive refractive power. The object-side surface S19 of the second cemented lens element B02 is convex at the near optical axis, the cemented surface S20 is convex at the near optical axis, and the image-side surface S21 is concave at the near optical axis.

[0101] The fifth lens group LG5 includes a twelfth lens L12 having negative refractive power, a thirteenth lens L13 having positive refractive power, and a fourteenth lens L14 having positive refractive power. The surface curvature of the twelfth lens L12 facing the image side is the same as the surface curvature of the thirteenth lens L13 facing the object side. The twelfth lens L12 and the thirteenth lens L13 form a third cemented lens B03, which has negative refractive power. The object-side surface S22 of the third cemented lens B03 is concave at the near optical axis, the cemented surface S23 is convex at the near optical axis, and the image-side surface S24 is convex at the near optical axis. The object-side surface S25 of the fourteenth lens L14 is convex at the near optical axis, and the image-side surface S26 is concave at the near optical axis.

[0102] The arrangement of the first doublet lens B01, the second doublet lens B02 and the third doublet lens B03 can correct the spherical aberration of the lens and make the structure of the lens more compact.

[0103] More specifically, the curvature radius R, center thickness D, refractive index Nd, and Abbe number V of each lens of the lens d Meet the conditions listed in the following table:

[0104] Surface number Curvature radius R Center thickness D Refractive index Nd Abbe number Vd S1 65.129 1.5 1.93323 20.88 S2 40 6.7 1.49845 81.61 S3 101.193 0.2 S4 53.2715 4.5339 1.88814 40.81 S5 187.4409 D S6 458.3704 1.0363 1.62542 58.31 S7 11.0669 7.6107 S8 (aspherical type) -54.6909 1.8 1.53379 55.81 S9 (aspherical type) 24.1728 1.6265 S10 72.6115 2.1102 1.89706 38.87 S11 -105.9577 0.8268 S12 -60.7502 1.0579 1.4381 95.1 S13 -289.425 D Aperture STO 0 1.1 S15 (aspherical type) 38.0135 1.3957 1.90987 31.36 S16 (aspherical type) 162.4154 D S17 (aspherical type) 17.4857 3 1.53379 55.81 S18 (aspherical type) -82.6972 4.8246 S19 43.8834 0.5 1.86099 36.6 S20 11.7756 5 1.49845 81.61 S21 -23.61 D S22 -128.8217 0.6 1.91048 31.31 S23 12.3364 3 1.49845 81.61 S24 57.3692 4.4063 S25 (aspherical type) 50.5759 3.8 1.85639 40.1 S26 (aspherical type) -45.1049 13.798

[0105] The positions of the second lens group and the fourth lens group are shown in the following table:

[0106]

[0107]

[0108] The optical data of each aspherical structure in the above table are shown in the following table:

[0109]

[0110] Figure 4 、 Figure 5 and Figure 6 The longitudinal spherical aberration curve of the lens in the first embodiment is included. The ordinate of the longitudinal spherical aberration curve represents the normalized entrance pupil diameter, and the abscissa represents the focus offset (mm). Specifically, Figure 4 The figures show the deviation of the focal point of light with wavelengths of 656.2800nm, 587.5618nm and 435.8400nm passing through the lens when the lens is in wide-angle state. Figure 5 The figures show the deviation of the focal point of light with wavelengths of 656.2800nm, 587.5618nm and 435.8400nm passing through the lens when the lens is in the middle state. Figure 6The figures show the deviation of the focal point of light with wavelengths of 656.2800nm, 587.5618nm, and 435.8400nm passing through the lens when the lens is in telephoto mode. As can be seen from the figures, the degree of deviation of the focal point of light of different wavelengths is consistent, effectively suppressing any blurring or color halation in the image.

[0111] Figure 7 、 Figure 8 and Figure 9 The astigmatism curve of the lens in the first embodiment is included, wherein the horizontal axis represents the focus shift (mm) and the vertical axis represents the field angle (deg). Figure 7 、 Figure 8 and Figure 9 The following astigmatism curves correspond to the lens at wide-angle, intermediate, and telephoto positions, respectively. Furthermore, the S curve represents sagittal field curvature at a wavelength of 587.5618nm, and the T curve represents meridional field curvature at a wavelength of 587.5618nm. As can be seen from the above graphs, the lens exhibits minimal field curvature, effectively suppressing image plane curvature. Furthermore, sagittal and meridional field curvature aberrations are minimal across all fields of view, and astigmatism is well controlled across all fields of view, resulting in sharp images from the center to the edges of the lens' field of view.

[0112] Figure 10 、 Figure 11 and Figure 12 The distortion curve of the lens in the first embodiment is included, wherein the horizontal axis represents the distortion and the vertical axis represents the field angle (deg). Figure 10 、 Figure 11 and Figure 12 The distortion curves for the lens at wide angle, mid-range, and telephoto are shown. As can be seen from the above figures, the degree of lens distortion is well controlled.

[0113] Example 2

[0114] This embodiment is substantially the same as the first embodiment, with the only difference being that the second lens group LG2 in the second embodiment does not include the seventh lens element L7 and that the parameters of the lenses are different. That is, the second embodiment lacks the object-side surface S12 and the image-side surface S13 of the seventh lens element L7 compared to the first embodiment.

[0115] In this embodiment, |F2 / FW|=1.033, F1 / F2=-6.904, F3 / FW=5.706, F2 / F4=-0.628, BF / (FW*tanω)=1.669, V d4 =68.710, V d5 =62.355, V d45 =65.533.

[0116] More specifically, the curvature radius R, center thickness D, refractive index Nd, and Abbe number V of each lens of the lens d Meet the conditions listed in the following table:

[0117]

[0118]

[0119] The positions of the second lens group and the fourth lens group are shown in the following table:

[0120] D(0) INF INF INF D(S5) 2 12.8344 20.0142 D(S11) 19.8142 8.9798 1.8 D(S16) 11.8236 8.7876 4.316 D(S21) 1.55 4.5361 9.0076

[0121] The optical data of each aspherical structure in the above table are shown in the following table:

[0122]

[0123] Figure 13 、 Figure 14 and Figure 15 The longitudinal spherical aberration curve of the lens in the second embodiment is included. The ordinate of the longitudinal spherical aberration curve represents the normalized entrance pupil diameter, and the abscissa represents the focus offset (mm). Specifically, Figure 13 The figures show the deviation of the focal point of light with wavelengths of 656.2800nm, 587.5618nm and 435.8400nm passing through the lens when the lens is in wide-angle state. Figure 14 The figures show the deviation of the focal point of light with wavelengths of 656.2800nm, 587.5618nm and 435.8400nm passing through the lens when the lens is in the middle state. Figure 15 The figures show the deviation of the focal point of light with wavelengths of 656.2800nm, 587.5618nm, and 435.8400nm passing through the lens when the lens is in telephoto mode. As can be seen from the figures, the degree of deviation of the focal point of light of different wavelengths is consistent, effectively suppressing any blurring or color halation in the image.

[0124] Figure 16 、 Figure 17 and Figure 18 The astigmatism curve of the lens in the second embodiment is included, wherein the horizontal axis represents the focus shift (mm) and the vertical axis represents the field angle (deg). Figure 16 、 Figure 17 and Figure 18The following astigmatism curves correspond to the lens at wide-angle, intermediate, and telephoto positions, respectively. Furthermore, the S curve represents sagittal field curvature at a wavelength of 587.5618nm, and the T curve represents meridional field curvature at a wavelength of 587.5618nm. As can be seen from the above graphs, the lens exhibits minimal field curvature, effectively suppressing image plane curvature. Furthermore, sagittal and meridional field curvature aberrations are minimal across all fields of view, and astigmatism is well controlled across all fields of view, resulting in sharp images from the center to the edges of the lens' field of view.

[0125] Figure 19 、 Figure 20 and Figure 21 The distortion curve of the lens in the second embodiment is included, wherein the horizontal axis represents the distortion and the vertical axis represents the field angle (deg). Figure 19 、 Figure 20 and Figure 21 The distortion curves for the lens at wide angle, mid-range, and telephoto are shown. As can be seen from the above figures, the degree of lens distortion is well controlled.

[0126] Example 3

[0127] This embodiment is substantially the same as the first embodiment, with the only difference being that the second lens group LG2 in the second embodiment does not include the seventh lens element L7 and that the parameters of the lenses are different. That is, the second embodiment lacks the object-side surface S12 and the image-side surface S13 of the seventh lens element L7 compared to the first embodiment.

[0128] In this embodiment, |F2 / FW|=1.168, F1 / F2=-7.552, F3 / FW=4.863, F2 / F4=-0.602, BF / (FW*tanω)=1.669, V d4 =68.710, V d5 =60.855, V d45 =64.783.

[0129] More specifically, the curvature radius R, center thickness D, refractive index Nd, and Abbe number V of each lens of the lens d Meet the conditions listed in the following table:

[0130]

[0131]

[0132] The positions of the second lens group and the fourth lens group are shown in the following table:

[0133] D(0) INF INF INF D(S5) 1.7026 14.0745 21.8361 D(S11) 21.9393 9.5674 1.8058 D(S16) 13.5571 9.5622 3.7177 D(S21) 1.4 5.3949 11.2394

[0134] The optical data of each aspherical structure in the above table are shown in the following table:

[0135]

[0136]

[0137] Figure 22 、 Figure 23 and Figure 24 The longitudinal spherical aberration curve of the lens in the third embodiment is included. The ordinate of the longitudinal spherical aberration curve represents the normalized entrance pupil diameter, and the abscissa represents the focus offset (mm). Specifically, Figure 22 The figures show the deviation of the focal point of light with wavelengths of 656.2800nm, 587.5618nm and 435.8400nm passing through the lens when the lens is in wide-angle state. Figure 23 The figures show the deviation of the focal point of light with wavelengths of 656.2800nm, 587.5618nm and 435.8400nm passing through the lens when the lens is in the middle state. Figure 24 The figures show the deviation of the focal point of light with wavelengths of 656.2800nm, 587.5618nm, and 435.8400nm passing through the lens when the lens is in telephoto mode. As can be seen from the figures, the degree of deviation of the focal point of light of different wavelengths is consistent, effectively suppressing any blurring or color halation in the image.

[0138] Figure 25 、 Figure 26 and Figure 27 The astigmatism curve of the lens in the third embodiment is included, wherein the horizontal axis represents the focus shift (mm) and the vertical axis represents the field angle (deg). Figure 25 、 Figure 26 and Figure 27 The following astigmatism curves correspond to the lens at wide-angle, intermediate, and telephoto positions, respectively. Furthermore, the S curve represents sagittal field curvature at a wavelength of 587.5618nm, and the T curve represents meridional field curvature at a wavelength of 587.5618nm. As can be seen from the above graphs, the lens exhibits minimal field curvature, effectively suppressing image plane curvature. Furthermore, sagittal and meridional field curvature aberrations are minimal across all fields of view, and astigmatism is well controlled across all fields of view, resulting in sharp images from the center to the edges of the lens' field of view.

[0139] Figure 28 、 Figure 29 and Figure 30 The distortion curve of the lens in the second embodiment is included, wherein the horizontal axis represents the distortion and the vertical axis represents the field angle (deg). Figure 28 、 Figure 29 and Figure 30 The distortion curves for the lens at wide angle, mid-range, and telephoto are shown. As can be seen from the above figures, the degree of lens distortion is well controlled.

[0140] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A lens, characterized in that: The lens comprises a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group, which are sequentially arranged along the optical axis from the object side to the image side, wherein the first lens group, the third lens group, and the fourth lens group have positive refractive power, and the second lens group and the fifth lens group have negative refractive power; The first lens group, the third lens group, and the fifth lens group are fixed relative to the image plane, and the second lens group and the fourth lens group are capable of reciprocating along the optical axis; The lens satisfies the following relationship: 0.8≤|F2 / FW|≤1.25; -8≤F1 / F2≤-5; 2≤F3 / FW≤6; -0.8≤F2 / F4≤-0.35; 0.96≤BF / (FW*tanω)<1.8; Wherein, F1 represents the composite focal length of the first lens group, F2 represents the composite focal length of the second lens group, F3 represents the composite focal length of the third lens group, F4 represents the composite focal length of the fourth lens group, FW represents the composite focal length of the lens, BF represents the distance from the image side of the most image side lens to the image plane, and ω represents the maximum half-field angle of view of the lens.

2. The lens according to claim 1, wherein: The lens satisfies the following relationship: 0.85≤|F2 / FW|≤1.

3. The lens according to claim 1, wherein: The lens satisfies the following relationship: 3≤F3 / FW≤5.

4. The lens according to claim 1, wherein: The lens satisfies the following relationship: -0.6≤F2 / F4≤-0.

4.

5. The lens according to claim 1, wherein: The lens satisfies the following relationship: 1.25≤BF / (FW*tanω)<1.

55.

6. The lens according to any one of claims 1 to 5, wherein: The fourth lens group and the fifth lens group each include at least two positive lenses, and the fourth lens group and the fifth lens group satisfy the following relationship: V d4 ≥63.39； V d5 ≥59.5； Among them, V d4 represents the average Abbe number of all positive lenses in the fourth lens group, V d5 represents the average Abbe number of all positive lenses in the fifth lens group.

7. The lens according to any one of claims 1 to 5, wherein: The fourth lens group and the fifth lens group simultaneously satisfy the following relationship: V d45 ≥63.39； Among them, V d45 represents the average Abbe number of all positive lenses in the fourth lens group and all positive lenses in the fifth lens group.

8. The lens according to any one of claims 1 to 5, wherein: The lens further includes a stop, a central axis of the stop coincides with the optical axis, and the stop is disposed between the second lens group and the third lens group.

9. A camera device, characterized in that: The lens comprises the lens according to any one of claims 1 to 8.

Images