Dual-mode lens with variable aperture
By designing a dual-mode lens with a variable aperture, combined with an external lens and a main camera lens, the problems of fixed-aperture lenses in complex lighting environments and depth-of-field effects are solved, achieving diverse shooting effects and portability, and improving image quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- DONGGUAN RONGGUANG OPTICAL CO LTD
- Filing Date
- 2026-01-30
- Publication Date
- 2026-04-28
AI Technical Summary
Existing lenses, with their fixed apertures, cannot adapt to complex lighting environments and different depth-of-field effects. Furthermore, their fixed field of view forces users to change lenses or add additional lenses for different shooting needs, which contradicts the requirements for portability and functional versatility.
Design a dual-mode lens with a variable aperture, including an external lens and a main lens. The lens combination achieves clear imaging within the aperture range of F#1.77~F#4.0. Through the optical power and total optical length design of the lens group, it provides a field of view of ≥90° and ≥150°, supporting the switching of different shooting ranges.
It achieves high-quality imaging under different aperture and depth-of-field conditions, supports large aperture bokeh and small aperture large depth-of-field effects, while reducing lens size and improving assembly yield to meet diverse shooting needs.
Smart Images
Figure CN121934253A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of optical lens technology, and more specifically to a dual-mode lens with a variable aperture. Background Technology
[0002] With the popularization of imaging technology and the increasing demands of consumers for shooting quality, camera lenses have become deeply integrated into various everyday and professional scenarios. To meet specific shooting needs, lenses with different functional focuses have emerged in the market, such as wide-angle lenses for landscape recording, macro lenses for the microscopic world, and prime portrait lenses for optimizing skin texture and bokeh in portraits. However, these lenses are mostly single-function, dedicated designs. Especially for prime lenses with fixed apertures, their imaging characteristics are limited to a fixed range of light transmission and depth of field. They cannot adapt to complex lighting environments ranging from bright to dim, nor can they flexibly switch between different depth-of-field effects (such as background blur and large depth-of-field panoramas). At the same time, the field of view of a single lens is usually fixed. If users want to change the shooting range (such as switching from a standard perspective to an ultra-wide-angle), they often need to change lenses or carry additional lens elements, which contradicts the urgent needs of modern users for portable, integrated, and versatile equipment. To solve the problem of fixed apertures, the industry has begun to explore variable aperture technology.
[0003] Therefore, the industry urgently needs an imaging lens that can provide different shooting effects, such as bokeh with a large aperture and a large depth of field with a small aperture, and can adapt the shooting range, in order to overcome the inherent defects in existing technologies, improve image quality and user satisfaction, and meet the growing demand for high-standard imaging. Summary of the Invention
[0004] This invention provides a dual-mode lens with a variable aperture, which can achieve clear imaging within the aperture range of F#1.77~F#4.0, while the main camera provides a field of view of ≥90°, and the external lens provides a field of view of ≥150°.
[0005] The present invention provides a dual-mode lens with a variable aperture, which sequentially includes an external lens and a main camera lens along the optical axis direction from the object side to the image side; the external lens consists of a first lens group and a second lens group; the first lens group has a negative optical power, the second lens group has a positive optical power, and the third lens group has a positive optical power; the first lens group consists of a first lens, a second lens, and a third lens; the first lens has a negative optical power, the second lens has a negative optical power, and the third lens has a positive optical power; the second lens group consists of a fourth lens and a fifth lens; the fourth lens has a negative optical power, and the fifth lens has a positive optical power; the main camera lens consists of a third lens group and a fourth lens group; the fourth lens group has a positive or negative optical power; the third lens group consists of a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens; the sixth lens has a positive optical power, the seventh lens has a negative optical power, the eighth lens has a positive optical power, the ninth lens has a negative optical power, and the tenth lens has a positive or negative optical power; the fourth lens group consists of an eleventh lens, a twelfth lens, and a thirteenth lens; the eleventh lens has a positive optical power, the twelfth lens has a negative optical power, and the thirteenth lens has a negative optical power; a protective glass and a variable aperture system are sequentially arranged between the external lens and the main camera lens; a filter is arranged between the main camera lens and the image plane.
[0006] Preferably, it satisfies the conditional formula -1 < fg1 / fg2 < 0, where fg1 represents the focal length of the first lens group and fg2 represents the focal length of the second lens group.
[0007] Preferably, it satisfies the conditional formula 0.0 < fL1 / fL2 < 3.0, where fL1 represents the focal length of the main camera lens and fL2 represents the combined focal length of the main camera lens and the external lens.
[0008] Preferably, it satisfies the conditional formula 1.0 < TTL1 / fL1 < 3.0, where TTL1 represents the total optical length of the main camera lens and fL1 represents the focal length of the main camera lens.
[0009] Preferably, it satisfies the conditional formula 0.0 < TTL2 / Dmax < 3.0, where TTL2 represents the total optical length of the combination of the main camera lens and the external lens, and Dmax represents the maximum aperture of the combination of the main camera lens and the external lens.
[0010] Preferably, it satisfies the conditional formulas 0.0 < f5 / fL2 < 10.0 and 1.0 < D5 / D6 < 4.0, where f5 represents the focal length of the fifth lens, fL2 represents the combined focal length of the main camera lens and the external lens, D5 represents the aperture of the fifth lens, and D6 represents the aperture of the sixth lens.
[0011] Preferably, it satisfies the conditional expression -10.0 < fg4 / f13 < 10.0, where fg4 represents the focal length of the fourth lens group and f13 represents the focal length of the thirteenth lens.
[0012] Preferably, it satisfies the conditional expressions 1.0 < fg3 / Fno(max) < 4.5 and 4.5 < fg3 / Fno(min) < 10.0, where Fno(max) represents the maximum value of the aperture of the dual-mode lens, Fno(min) represents the minimum value of the aperture of the dual-mode lens, and fg3 represents the focal length of the third lens group.
[0013] Preferably, it satisfies the conditional expressions 0.0 < SAG121 / SAG122 < 1.0 and -1.0 < SAG132 / f13 < 0.0, where SAG121 represents the maximum value of the absolute value of the sagittal height of the object side of the twelfth lens, SAG122 represents the maximum value of the absolute value of the sagittal height of the image side of the twelfth lens, SAG132 represents the maximum value of the absolute value of the sagittal height of the image side of the thirteenth lens, and f13 represents the focal length of the thirteenth lens.
[0014] The beneficial effects of the present invention are as follows: 1. Satisfying the conditional expression -1 < fg1 / fg2 < 0 enables the light rays parallelly incident into the external lens to exit parallelly again, effectively adjusting the light path and achieving the effect of increasing the angle of the main lens.
[0015] 2. Satisfying the conditional expression 0.0 < fL1 / fL2 < 3.0 can ensure that the angle difference between the main camera lens and the combined lens is large enough to meet the wide-angle effect of the external lens and provide two different shooting ranges.
[0016] 3. Satisfying the conditional expression 1.0 < TTL1 / fL1 < 2.0 can effectively control the overall optical length of the main camera lens, ensure the miniaturization of the main camera lens, and reduce the volume of the camera.
[0017] 4. Satisfying the conditional expression 0.0 < TTL2 / Dmax < 3.0 can effectively control the overall optical length of the external lens and reduce the maximum aperture of the dual-mode lens, ensuring the miniaturization of the dual-mode lens.
[0018] 5. Satisfying the conditional expressions 0.0 < f5 / fL2 < 10.0 and 1.0 < D5 / D6 < 4.0 can effectively control the exit angle of the light rays of the fifth lens, and further control the distance between the external lens and the main camera lens to be greater than the lower limit value, so as to meet the length requirement for carrying a variable aperture. At the same time, control the distance between the external lens and the main camera lens to be less than the upper limit value, thereby effectively reducing the sensitivity of the group tolerance between the external lens and the main camera lens, improving the assembly yield, and reducing the production cost.
[0019] 6. Meeting the conditional expression -10.0 < fg4 / f13 < 10.0 can effectively control the distance between the main camera lens and the imaging plane, meet the focusing distance of the lens, and avoid interference between the lens and the chip.
[0020] 7. Meeting the conditional expressions 1.0 < fg3 / Fno(max) < 4.5 and 4.5 < fg3 / Fno(min) < 10.0 can effectively ensure that the main camera lens can effectively receive incident light under different aperture values, and adjust the light exit angle, providing effective help for the rear lens to optimize aberrations.
[0021] 8. Meeting the conditional expressions 0.0 < SAG121 / SAG122 < 1.0 and -1.0 < SAG132 / f13 < 0.0 can optimize aberrations and CRA by controlling the surface shape of the rear lens group, improve the resolution of the lens, and achieve higher imaging performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a schematic cross-sectional structure diagram of the first embodiment of the present invention.
[0023] Figure 2 It is a graph of the optical transfer function when F# = 4.0 in the first embodiment of the present invention.
[0024] Figure 3 It is a graph of the optical transfer function when F# = 1.77 in the first embodiment of the present invention.
[0025] Figure 4 It is a schematic cross-sectional structure diagram of the second embodiment of the present invention.
[0026] Figure 5 It is a graph of the optical transfer function when F# = 4.0 in the second embodiment of the present invention.
[0027] Figure 6 It is a graph of the optical transfer function when F# = 1.77 in the second embodiment of the present invention.
[0028] Figure 7 It is a schematic cross-sectional structure diagram of the third embodiment of the present invention.
[0029] Figure 8 It is a graph of the optical transfer function when F# = 4.0 in the third embodiment of the present invention.
[0030] Figure 9 It is a graph of the optical transfer function when F# = 1.77 in the third embodiment of the present invention.
[0031] Figure 10 It is a schematic cross-sectional structure diagram of the fourth embodiment of the present invention.
[0032] Figure 11 This is the optical transfer function curve when F#=4.0 in the fourth embodiment of the present invention.
[0033] Figure 12 This is the optical transfer function curve when F#=1.77 in the fourth embodiment of the present invention.
[0034] Figure 13 This is a schematic diagram of the cross-sectional structure of the fifth embodiment of the present invention.
[0035] Figure 14 This is the optical transfer function curve when F#=4.0 in the fifth embodiment of the present invention.
[0036] Figure 15 This is the optical transfer function curve when F#=1.77 in the fifth embodiment of the present invention.
[0037] The attached figures are labeled as follows: first lens group 10, first lens 11, second lens 12, third lens 13, fourth lens 14, fifth lens 15, sixth lens 16, seventh lens 17, eighth lens 18, ninth lens 19, tenth lens 20, eleventh lens 21, twelfth lens 22, thirteenth lens 23, second lens group 24, third lens group 25, fourth lens group 26, protective glass 27, variable aperture system 28, and filter 29. Detailed Implementation
[0038] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to specific embodiments and accompanying drawings.
[0039] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0040] In this embodiment, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object being photographed is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.
[0041] For the first embodiment, please refer to... Figures 1-3As shown, in the first embodiment of the present invention, a dual-mode lens with a variable aperture is provided, wherein the first lens group 10 has negative optical power, the second lens group 24 has positive optical power, the third lens group 25 has positive optical power, and the fourth lens group 26 has negative optical power.
[0042] The first lens 11 has negative optical power, with a convex center on the object side and a concave center on the image side; the second lens 12 has negative optical power, with a convex center on the object side and a concave center on the image side; the third lens 13 has positive optical power, with a convex center on the object side and a concave center on the image side; the fourth lens 14 has negative optical power, with a convex center on the object side and a concave center on the image side; the fifth lens 15 has positive optical power, with a convex center on both the object and image sides; the sixth lens 16 has positive optical power, with a convex center on the object side and a concave center on the image side; the seventh lens 17 has negative optical power, with a convex center on the object side and a concave center on the image side; The image side of the lens is concave at the center; the eighth lens 18 has positive optical power and both the object side and image side are convex at the center; the ninth lens 19 has negative optical power and both the object side and image side are concave at the center; the tenth lens 20 has either positive or negative optical power and both the object side and image side are concave at the center; the eleventh lens 21 has positive optical power and both the object side and image side are convex at the center; the twelfth lens 22 has negative optical power and both the object side and image side are convex at the center; the thirteenth lens 23 has negative optical power and both the object side and image side are concave at the center.
[0043] A specific main camera lens is connected to the macro lens via structural components.
[0044] The relevant parameters of each lens in this embodiment are shown in Table 1-1, and the parameters of each aspherical lens in this embodiment are shown in Table 1-2.
[0045]
[0046]
[0047] All of the aforementioned aspherical surfaces satisfy the following equation:
[0048] Where: z represents the distance of the surface from the vertex of the surface along the optical axis, C represents the curvature of the vertex of the surface, K represents the quadratic surface coefficient, h represents the distance from the optical axis to the surface, and B, C, D, E, F, G, and H represent the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth order surface coefficients, respectively. The aspherical surfaces in the following examples all follow this formula.
[0049] In the first embodiment, the focal length of the main lens optical system of the dual-mode lens is fL1 = 6.291 mm, the focal length of the optical system of the main lens and the external lens combination is fL2 = 3.903 mm, the full field of view of the main lens is 2θ1 = 91.2 degrees, the full field of view of the main lens and the external lens combination is 2θ2 = 156.0 degrees, the total system length of the main lens is TTL1 = 8.875 mm, and the total system length of the main lens and the external lens combination is TTL2 = 25.723 mm. Table 1-3 shows the calculation results under these conditions.
[0050]
[0051] Second embodiment, please refer to Figures 4-6 As shown. This invention provides a dual-mode lens with a variable aperture. The lens structure of this embodiment is largely the same as that of Embodiment 1, except that the curvature, surface coefficient, lens spacing, and lens center thickness of each lens are different. The center of the image side of the third lens 13 is concave; the center of the image side of the ninth lens 19 is concave; the fourth lens group 26 has positive optical power; a specific main camera lens is connected to the macro lens through a structural component.
[0052] The relevant parameters of each lens in this embodiment are shown in Table 2-1, and the parameters of each aspherical lens in this embodiment are shown in Table 2-2.
[0053]
[0054]
[0055] All of the aforementioned aspherical surfaces satisfy the following equation:
[0056] Where: z represents the distance of the surface from the vertex of the surface along the optical axis, C represents the curvature of the vertex of the surface, K represents the quadratic surface coefficient, h represents the distance from the optical axis to the surface, and B, C, D, E, F, G, and H represent the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth order surface coefficients, respectively. The aspherical surfaces in the following examples all follow this formula.
[0057] In the second embodiment, the focal length of the main lens optical system of the dual-mode lens is fL1 = 6.337mm, the focal length of the optical system of the main lens and the external lens combination is fL2 = 3.986mm, the full field of view of the main lens is 2θ1 = 91.5 degrees, the full field of view of the main lens and the external lens combination is 2θ2 = 163.0 degrees, the total system length of the main lens is TTL1 = 9.542mm, and the total system length of the main lens and the external lens combination is TTL2 = 23.805mm. Table 2-3 shows the calculation results.
[0058]
[0059] Third embodiment, please refer to Figures 7-9 As shown. This invention provides a dual-mode lens with a variable aperture. The lens structure of this embodiment is largely the same as that of Embodiment 1, except that the curvature, surface coefficient, lens spacing, and center thickness of each lens are different. The object-side center of the ninth lens 19 is convex, and the image-side center is also convex; the object-side center of the eleventh lens 21 is concave; the fourth lens group 26 has positive optical power; a specific main camera lens is connected to the macro lens through structural components.
[0060] The relevant parameters of each lens in this embodiment are shown in Table 3-1, and the parameters of each aspherical lens in this embodiment are shown in Table 3-2.
[0061]
[0062]
[0063] All of the aforementioned aspherical surfaces satisfy the following equation:
[0064] Where: z represents the distance of the surface from the vertex of the surface along the optical axis, C represents the curvature of the vertex of the surface, K represents the quadratic surface coefficient, h represents the distance from the optical axis to the surface, and B, C, D, E, F, G, and H represent the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth order surface coefficients, respectively. The aspherical surfaces in the following examples all follow this formula.
[0065] In the third embodiment, the focal length of the main lens optical system of the dual-mode lens is fL1 = 6.200mm, the focal length of the optical system of the main lens and the external lens combination is fL2 = 4.217mm, the full field of view of the main lens is 2θ1 = 91.6 degrees, the full field of view of the main lens and the external lens combination is 2θ2 = 157.7 degrees, the total system length of the main lens is TTL1 = 9.784mm, and the total system length of the main lens and the external lens combination is TTL2 = 23.661mm. Table 3-3 shows the calculation results.
[0066]
[0067] For the fourth embodiment, please refer to [link / reference]. Figures 10-12As shown. This invention provides a dual-mode lens with a variable aperture. The lens structure of this embodiment is largely the same as that of Embodiment 1, except that the curvature, surface coefficient, lens spacing, and lens center thickness of each lens are different. The object-side center of the ninth lens 19 is convex, and the image-side center is also convex. The tenth lens 20 has negative optical power. The fourth lens group 26 has positive optical power. A specific main camera lens is connected to the macro lens through a structural component.
[0068] The relevant parameters of each lens in this embodiment are shown in Table 4-1, and the parameters of each aspherical lens in this embodiment are shown in Table 4-2.
[0069]
[0070]
[0071] All of the aforementioned aspherical surfaces satisfy the following equation:
[0072] Where: z represents the distance of the surface from the vertex of the surface along the optical axis, C represents the curvature of the vertex of the surface, K represents the quadratic surface coefficient, h represents the distance from the optical axis to the surface, and B, C, D, E, F, G, and H represent the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth order surface coefficients, respectively. The aspherical surfaces in the following examples all follow this formula.
[0073] In the fourth embodiment, the focal length of the main lens optical system of the dual-mode lens is fL1 = 6.240mm, the focal length of the optical system of the main lens and the external lens combination is fL2 = 3.969mm, the full field of view of the main lens is 2θ1 = 91.8 degrees, the full field of view of the main lens and the external lens combination is 2θ2 = 157.6 degrees, the total system length of the main lens is TTL1 = 9.626mm, and the total system length of the main lens and the external lens combination is TTL2 = 22.987mm. Table 4-3 shows the calculation results.
[0074]
[0075] For the fifth embodiment, please refer to... Figures 13-15 As shown. This invention provides a dual-mode lens with a variable aperture. The lens structure of this embodiment is largely the same as that of Embodiment 1, except that the curvature, surface coefficient, lens spacing, and lens center thickness of each lens are different. The object-side center of the second lens 12 is concave; the object-side center of the fifth lens 15 is concave; a specific main camera lens is connected to the macro lens through a structural component.
[0076] The relevant parameters of each lens in this embodiment are shown in Table 5-1, and the parameters of each aspherical lens in this embodiment are shown in Table 5-2.
[0077]
[0078]
[0079] All of the aforementioned aspherical surfaces satisfy the following equation:
[0080] Where: z represents the distance of the surface from the vertex of the surface along the optical axis, C represents the curvature of the vertex of the surface, K represents the quadratic surface coefficient, h represents the distance from the optical axis to the surface, and B, C, D, E, F, G, and H represent the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth order surface coefficients, respectively. The aspherical surfaces in the following examples all follow this formula.
[0081] In the fifth embodiment, the focal length of the main lens optical system of the dual-mode lens is fL1 = 6.336 mm, the focal length of the optical system of the main lens and the external lens combination is fL2 = 3.991 mm, the full field of view of the main lens is 2θ1 = 90.5 degrees, the full field of view of the main lens and the external lens combination is 2θ2 = 150.0 degrees, the total system length of the main lens is TTL1 = 8.897 mm, and the total system length of the main lens and the external lens combination is TTL2 = 27.590 mm. Table 5-3 shows the calculation results under these conditions.
[0082]
[0083] The embodiments described above illustrate only five implementation methods of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.
Claims
1. A dual-mode lens with a variable aperture, characterized in that: It successively includes an external lens and a main camera lens from the object side to the image side along the optical axis direction; The external lens is composed of a first lens group (10) and a second lens group (24); the first lens group (10) has a negative optical power, the second lens group (24) has a positive optical power, and the third lens group (25) has a positive optical power; The first lens group (10) is composed of a first lens (11), a second lens (12), and a third lens (13); the first lens (11) has a negative optical power, the second lens (12) has a negative optical power, and the third lens (13) has a positive optical power; The second lens group (24) is composed of a fourth lens (14) and a fifth lens (15); the fourth lens (14) has a negative optical power, and the fifth lens (15) has a positive optical power; The main camera lens is composed of a third lens group (25) and a fourth lens group (26); the fourth lens group (26) has a positive or negative optical power; The third lens group (25) is composed of a sixth lens (16), a seventh lens (17), an eighth lens (18), a ninth lens (19), and a tenth lens (20); the sixth lens (16) has a positive optical power, the seventh lens (17) has a negative optical power, the eighth lens (18) has a positive optical power, the ninth lens (19) has a negative optical power, and the tenth lens (20) has a positive or negative optical power; The fourth lens group (26) is composed of an eleventh lens (21), a twelfth lens (22), and a thirteenth lens (23); the eleventh lens (21) has a positive optical power, the twelfth lens (22) has a negative optical power, and the thirteenth lens (23) has a negative optical power; A protective glass (27) and a variable aperture system (28) are successively arranged between the external lens and the main camera lens; a filter (29) is arranged between the main camera lens and the image plane.
2. The dual-mode lens with variable aperture according to claim 1, characterized in that: It satisfies the conditional formula -1 < fg1 / fg2 < 0, where fg1 represents the focal length of the first lens group (10), and fg2 represents the focal length of the second lens group (24).
3. A dual-mode lens with a variable aperture according to claim 1 or 2, characterized in that: It satisfies the conditional formula 0.0 < fL1 / fL2 < 3.0, where fL1 represents the focal length of the main camera lens, and fL2 represents the combined focal length of the main camera lens and the external lens.
4. A dual-mode lens with a variable aperture according to claim 3, characterized in that: It satisfies the conditional formula 1.0 < TTL1 / fL1 < 3.0, where TTL1 represents the total optical length of the main camera lens, and fL1 represents the focal length of the main camera lens.
5. A dual-mode lens with a variable aperture according to claim 4, characterized in that: It satisfies the conditional formula 0.0 < TTL2 / Dmax < 3.0, where TTL2 represents the total optical length of the combination of the main camera lens and the external lens, and Dmax represents the maximum aperture of the combination of the main camera lens and the external lens.
6. A dual-mode lens with a variable aperture according to claim 5, characterized in that: It satisfies the conditional expressions 0.0 < f5 / fL2 < 10.0 and 1.0 < D5 / D6 < 4.0, where f5 represents the focal length of the fifth lens (15), fL2 represents the focal length of the combination of the main camera lens and the external lens, D5 represents the aperture of the fifth lens (15), and D6 represents the aperture of the sixth lens (16).
7. A dual-mode lens with a variable aperture according to claim 6, characterized in that: It satisfies the conditional expression -10.0 < fg4 / f13 < 10.0, where fg4 represents the focal length of the fourth lens group (26) and f13 represents the focal length of the thirteenth lens (23).
8. A dual-mode lens with a variable aperture according to claim 7, characterized in that: It satisfies the conditional expressions 1.0 < fg3 / Fno(max) < 4.5 and 4.5 < fg3 / Fno(min) < 10.0, where Fno(max) represents the maximum value of the aperture of the dual-mode lens, Fno(min) represents the minimum value of the aperture of the dual-mode lens, and fg3 represents the focal length of the third lens group (25).
9. A dual-mode lens with a variable aperture according to claim 8, characterized in that: It satisfies the conditional expressions 0.0 < SAG121 / SAG122 < 1.0 and -1.0 < SAG132 / f13 < 0.0, where SAG121 represents the maximum value of the absolute value of the object-side sagittal height of the twelfth lens (22), SAG122 represents the maximum value of the absolute value of the image-side sagittal height of the twelfth lens (22), SAG132 represents the maximum value of the absolute value of the image-side sagittal height of the thirteenth lens (23), and f13 represents the focal length of the thirteenth lens (23).