A super small day and night confocal wide-angle zoom lens and an imaging device

Abstract

This invention discloses an ultra-compact wide-angle zoom lens and imaging device with day and night confocal focus, comprising a first lens group, a second lens group, and a third lens group arranged sequentially from the object side to the image side. The first lens group has a negative optical power, and the second lens group has a positive optical power. The first and second lens groups are adjustable along the optical axis from the object side to the image side to achieve zoom. The third lens group is fixed relative to the image plane. The first lens group includes a first lens, a second lens, and a third lens. The second lens group includes a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens. The third lens group includes a tenth lens. The first, second, and sixth lenses all have negative optical power, and the third, fourth, fifth, and ninth lenses all have positive optical power. One of the seventh and eighth lenses has a negative optical power, and the other lens has a positive optical power. The seventh and eighth lenses are bonded together to form a cemented lens.

Description

Technical Field

[0001] This invention relates to the technical field of wide-angle zoom lenses, specifically to an ultra-compact wide-angle zoom lens and imaging device with day and night confocal focus. Background Technology

[0002] With the rapid development of intelligent networks and AI technologies, the intelligent surveillance industry is gradually upgrading mainstream image resolution from 2 megapixels to 5 megapixels, 8 megapixels, or even higher. Under this trend, day and night co-focus wide-angle surveillance lenses, characterized by miniaturization, high resolution, and large aperture, are widely used in various dome and barrel cameras.

[0003] Currently, developing lenses of similar specifications faces several key technical challenges: First, the requirements of ultra-wide-angle, high pixel count, and large aperture often necessitate larger lens diameters and overall optical lengths. This creates a conflict between correcting various aberrations and miniaturizing the lens, making it difficult to achieve a balance. Second, to achieve day and night co-focusing of visible and near-infrared light, it is necessary to simultaneously correct chromatic aberrations in g (435 nm) and c (656 nm) light, while also considering chromatic aberrations in g (435 nm) and s (850 nm) light. This cross-band chromatic aberration correction is quite complex. Design issues often arise where excellent visible light performance leads to a decrease in near-infrared performance, or where maintaining infrared performance exacerbates purple fringing in the visible light band. Furthermore, in terms of structural dimensions, current mainstream 2.0–3.0x zoom lenses are often too large in size and length, making it difficult to meet the miniaturization requirements of spherical and barrel-shaped cameras. Finally, to simultaneously meet the aforementioned high-performance specifications, lenses typically require multiple aspherical and ultra-low dispersion elements, resulting in high costs. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides an ultra-compact wide-angle zoom lens and imaging device with day and night confocal focus, which solves the problems of existing wide-angle lenses being unable to simultaneously meet the requirements of high pixel count, large aperture and small size, difficulty in chromatic aberration correction of visible light and near-infrared light, and high cost.

[0005] According to a first aspect of an embodiment of the present invention, an ultra-compact wide-angle zoom lens with day and night confocal focus includes: A first lens group, a second lens group, and a third lens group are arranged sequentially from the object side to the image side. The optical power of the first lens group is negative, and the optical power of the second lens group is positive. The first lens group and the second lens group are adjustable along the optical axis from the object side to the image side to achieve zoom. The third lens group is fixed relative to the image plane. The first lens group includes a first lens, a second lens, and a third lens; the second lens group includes a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens; and the third lens group includes a tenth lens. The first, second, and sixth lenses all have negative optical power, while the third, fourth, fifth, and ninth lenses all have positive optical power. One of the seventh and eighth lenses has negative optical power, and the other has positive optical power. The seventh and eighth lenses are cemented together to form a cemented lens.

[0006] An ultra-compact wide-angle zoom lens with day and night confocal focus according to an embodiment of the present invention has at least the following beneficial effects: The wide-angle zoom lens provided by this invention, by designing lenses with different optical powers at different positions and rationally distributing refractive power, effectively corrects various monochromatic aberrations such as spherical aberration, coma, astigmatism, and image plane curvature, as well as chromatic aberration, to achieve good image quality and correct chromatic aberration in visible light and near-infrared light. This achieves the goal of high resolution and day-night confocal focusing. By designing multiple lenses as aspherical lenses, it is beneficial to correct aberrations such as astigmatism and coma. In addition, the optical system is equipped with multiple resin lenses, which helps to reduce costs, forming an ultra-compact, high-resolution, low-cost wide-angle zoom lens design scheme with day-night confocal focusing.

[0007] According to some embodiments of the present invention, the second lens, the third lens, the fifth lens, the sixth lens, the ninth lens, and the tenth lens are aspherical lenses.

[0008] According to some embodiments of the present invention, the second lens, the third lens, the fifth lens, the sixth lens, the ninth lens, and the tenth lens are resin lenses.

[0009] According to some embodiments of the present invention, an aperture stop is provided between the first lens group and the second lens group.

[0010] According to some embodiments of the present invention, the aperture stop is fixedly disposed relative to the second lens group, and the aperture stop moves with the second lens group during zooming.

[0011] According to some embodiments of the present invention, the first lens group satisfies the following condition: 2.0 < |fL1 / fw| < 3.5; 2.0 < |fL2 / fw| < 3.5; 0.8 < |fL12 / fw| < 1.5; Wherein, fL1 is the focal length of the first lens in the first lens group; fL2 is the focal length of the second lens in the first lens group; fL12 is the combined focal length of the first lens and the second lens; and fw is the focal length at the wide-angle end of the wide-angle zoom lens when focused to infinity.

[0012] According to some embodiments of the present invention, the second lens group satisfies the following condition: 2.0 < f²x / fw < 6.0; Where f2x is the focal length of any one of the fourth and fifth lenses; fw is the focal length at the wide-angle end when focusing at infinity.

[0013] According to some embodiments of the present invention, the features of the second lens group satisfy the following conditional expression: 75.496≦VdA; Wherein, VdA is the average Abbe number of positive diopter lenses other than resin lenses in the second lens group.

[0014] According to some embodiments of the present invention, the wide-angle zoom lens satisfies the following condition: 7.4 ≤ TTL / fw ≤ 13.3; Wherein, TTL is the total optical length of the wide-angle zoom lens; fw is the focal length at the wide-angle end of the wide-angle zoom lens when focused to infinity.

[0015] An imaging apparatus according to a second aspect of an embodiment of the present invention is characterized in that the imaging apparatus includes the wide-angle zoom lens described above.

[0016] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 A schematic diagram of the structure at the wide-angle end of an embodiment of an ultra-compact day / night confocal wide-angle zoom lens provided by the present invention. Figure 2 for Figure 1 A schematic diagram of the structure at the telescope end of the embodiment; Figure 3 for Figure 1 Aberration diagrams of spherical aberration, astigmatism, and distortion at the wide-angle end of the example; Figure 4 for Figure 1 Aberration diagrams of spherical aberration, astigmatism, and distortion at the telephoto end in the example; Figure 5 for Figure 1The fan pattern of the embodiment at the wide-angle end; Figure 6 for Figure 1 The optical fan pattern at the telephoto end of the embodiment; Figure 7 This invention provides a miniature day and night confocal wide-angle zoom lens, and two embodiments thereof are shown in schematic diagrams at the wide-angle end. Figure 8 for Figure 7 A schematic diagram of the structure at the telescope end of the embodiment; Figure 9 for Figure 7 Aberration diagrams of spherical aberration, astigmatism, and distortion at the wide-angle end of the example; Figure 10 for Figure 7 Aberration diagrams of spherical aberration, astigmatism, and distortion at the telephoto end in the example; Figure 11 for Figure 7 The fan pattern of the embodiment at the wide-angle end; Figure 12 for Figure 7 The optical fan pattern of the embodiment at the telescope end.

[0018] Icon labels: First lens group 100; First lens 110; Second lens 120; Third lens 130; Aperture 200; Second lens group 300; Fourth lens 310; Fifth lens 320; Sixth lens 330; Seventh lens 340; Eighth lens 350; Ninth lens 360; The third lens group is 400; the tenth lens group is 410. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0021] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0022] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0023] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are some embodiments of the present invention, not all embodiments.

[0024] With the rapid development of intelligent networks and AI technologies, the intelligent surveillance industry is gradually upgrading mainstream image resolution from 2 megapixels to 5 megapixels, 8 megapixels, or even higher. Under this trend, day and night co-focus wide-angle surveillance lenses, characterized by miniaturization, high resolution, and large aperture, are widely used in various dome and barrel cameras.

[0025] Currently, developing lenses of similar specifications faces several key technical challenges: First, the requirements of ultra-wide-angle, high pixel count, and large aperture often necessitate larger lens diameters and overall optical lengths. This creates a conflict between correcting various aberrations and miniaturizing the lens, making it difficult to achieve a balance. Second, to achieve day and night co-focusing of visible and near-infrared light, it is necessary to simultaneously correct chromatic aberrations in g (435 nm) and c (656 nm) light, while also considering chromatic aberrations in g (435 nm) and s (850 nm) light. This cross-band chromatic aberration correction is quite complex. Design issues often arise where excellent visible light performance leads to a decrease in near-infrared performance, or where maintaining infrared performance exacerbates purple fringing in the visible light band. Furthermore, in terms of structural dimensions, current mainstream 2.0–3.0x zoom lenses are often too large in size and length, making it difficult to meet the miniaturization requirements of spherical and barrel-shaped cameras. Finally, to simultaneously meet the aforementioned high-performance specifications, lenses typically require multiple aspherical and ultra-low dispersion elements, resulting in high costs.

[0026] To address the aforementioned issues, this invention proposes an ultra-compact day / night co-focus wide-angle zoom lens and imaging device, which solves the problems of existing wide-angle lenses being unable to simultaneously meet the requirements of high pixel count, large aperture, and small size, difficulties in chromatic aberration correction for visible and near-infrared light, and high costs.

[0027] refer to Figures 1 to 12 The present invention provides an ultra-compact wide-angle zoom lens and imaging device with day and night confocal focus, which are implemented in the following embodiments: An embodiment of the present invention provides an ultra-compact wide-angle zoom lens with day and night confocal focus, comprising a first lens group 100, a second lens group 300, and a third lens group 400 arranged sequentially from the object side to the image side.

[0028] The first lens group 100 has a negative optical power, the second lens group 300 has a positive optical power, the first lens group 100 and the second lens group 300 are adjustable along the optical axis from the object side to the image side to achieve zoom, and the third lens group 400 is fixed relative to the image plane.

[0029] The first lens group 100 includes a first lens 110, a second lens 120, and a third lens 130; the second lens group 300 includes a fourth lens 310, a fifth lens 320, a sixth lens 330, a seventh lens 340, an eighth lens 350, and a ninth lens 360; and the third lens group 400 includes a tenth lens 410. The first lens 110, the second lens 120, and the sixth lens 330 all have negative optical power; the third lens 130, the fourth lens 310, the fifth lens 320, and the ninth lens 360 all have positive optical power; one of the seventh lens 340 and the eighth lens 350 has negative optical power, and the other has positive optical power; the seventh lens 340 and the eighth lens 350 are cemented together to form a cemented lens.

[0030] According to some embodiments of the present invention, the second lens 120, the third lens 130, the fifth lens 320, the sixth lens 330, the ninth lens 360 and the tenth lens 410 are aspherical lenses.

[0031] According to some embodiments of the present invention, the second lens 120, the third lens 130, the fifth lens 320, the sixth lens 330, the ninth lens 360 and the tenth lens 410 are resin lenses.

[0032] This invention, through the design of the optical power and aspherical configuration of the entire lens system, and the placement of aspherical surfaces of different materials at different positions, can effectively correct various aberrations such as spherical aberration, coma, astigmatism, image plane curvature, and chromatic aberration, achieving good image quality and reaching the goal of high pixel count and day-night confocal focus. Specifically, the second lens 120 and the third lens 130 are designed as aspherical lenses, which is beneficial for correcting aberrations such as distortion, astigmatism, and coma at the wide-angle end; the fifth lens 320 and the sixth lens 330 are set as aspherical lenses, which is beneficial for correcting aberrations such as spherical aberration, astigmatism, coma, and chromatic aberration; the seventh lens 340 and the eighth lens 350 are cemented together to form a positive lens and a negative lens cemented lens, and with different refractive indices and dispersion coefficients, axial chromatic aberration and magnification chromatic aberration can be effectively compensated and corrected without affecting the focal length.

[0033] Furthermore, while multiple aspherical lenses can improve image quality and correct aberrations, their high cost makes them unsuitable for market demands. Therefore, the second lens 120, the third lens 130, the fifth lens 320, the sixth lens 330, the ninth lens 360, and the tenth lens 410 are designed as resin lenses, thus forming a glass-plastic hybrid optical system. This effectively controls costs and balances high pixel count, high image quality, and low cost. At the same time, configuring two lens groups, each consisting of two consecutive resin lenses, in the optical system improves the ease of lens assembly and assembly accuracy.

[0034] According to some embodiments of the present invention, an aperture stop 200 is provided between the first lens group 100 and the second lens group 300. The aperture stop 200 is fixedly disposed relative to the second lens group 300. The aperture stop 200 moves with the second lens group 300 during zooming. By designing the aperture stop 200 to limit the light path, the influence of stray light is reduced, which is beneficial to improving the image quality. During zooming, the aperture stop 200 moves with the second lens group 300, which makes it easier to achieve miniaturization compared to a lens with a fixed aperture stop 200.

[0035] According to some embodiments of the present invention, the first lens group 100 satisfies the following condition: 2.0<|fL1 / fw|<3.5; (1) 2.0<|fL2 / fw|<3.5; (2) 0.8<|fL12 / fw|<1.5; (3) Wherein, fL1 is the focal length of the first lens element 110 in the first lens group 100; fL2 is the focal length of the second lens element 120 in the first lens group 100; fL12 is the combined focal length of the first lens element 110 and the second lens element 120; and fw is the focal length at the wide-angle end of the wide-angle zoom lens when focused to infinity.

[0036] The embodiments of the present invention limit the focal length of the two negative lenses in the first lens group 110 by the above conditional formulas (1), (2), and (3), aiming to control the aperture of the lens group, thereby achieving lens miniaturization while ensuring good optical performance in the ultra-wide-angle state.

[0037] If the ratios in conditions (1), (2), and (3) exceed the upper limit, the optical power of the first lens 110 and the second lens 120 will be too weak, which will lead to an increase in the aperture of the first lens group 100, making it difficult to achieve both miniaturization and ultra-wide-angle simultaneously. Conversely, if the ratios in conditions (1), (2), and (3) are below the lower limit, the optical power of the two negative lenses, the first lens 110 and the second lens 120, will be too strong. In order to maintain the focal length, the surface curvature of the positive lens in the lens needs to be increased, which will cause difficulties in distortion and magnification chromatic aberration correction, affecting the high performance of the lens.

[0038] According to some embodiments of the present invention, the second mirror group 300 satisfies the following condition: 2.0 < f2x / fw < 6.0; (4) Where f2x is the focal length of either the fourth lens 310 or the fifth lens 320; fw is the focal length at the wide-angle end when focusing at infinity.

[0039] The above conditional formula (4) limits the optical power range of the two positive lenses (i.e., the fourth lens 310 and the fifth lens 320) arranged continuously from the object side in the second lens group 300, so as to control the aperture of the lens group and constrain its movement during zooming, thereby achieving lens miniaturization while maintaining good optical performance.

[0040] If the optical power of the fourth lens 310 or the fifth lens 320 is lower than the lower limit of the condition (4), that is, the optical power of the two positive lenses is too weak, it will cause the aperture of the second lens group 300 to increase, and a longer moving distance is required when zooming, which is not conducive to the miniaturization of the structure; on the contrary, if the optical power exceeds the upper limit, the optical power of the two positive lenses will be too strong, which will cause a significant increase in aberrations such as spherical aberration, coma, and astigmatism, which are difficult to correct, thus affecting the imaging performance.

[0041] Furthermore, according to some embodiments of the present invention, the features of the second mirror group 300 satisfy the following conditional expression: 75.496≦VdA; (5) VdA is the average Abbe number of positive power lenses other than resin lenses in the second lens group 300.

[0042] The present invention defines the Abbe number range of optical materials used in all lenses with positive power in the second lens group 300 except for resin lenses by using conditional formula (5). By rationally selecting materials within this range, the axial chromatic aberration caused by wavelength differences from visible light to near-infrared bands can be effectively controlled, thereby reducing focus shift and achieving day and night confocality.

[0043] If this condition is not met, the color difference correction will be insufficient. Specifically, in the visible light band, insufficient correction of g light (435nm) will result in obvious purple fringing in the image, affecting image quality; in the near-infrared band, insufficient correction of t light (1013 nm) will cause an increase in the relative shift of the focal points of visible light and infrared light, making it difficult to achieve day and night co-focus effect.

[0044] In some embodiments of the present invention, the wide-angle zoom lens satisfies the following condition: 7.4≦TTL / fw≦13.3;(6) Where TTL is the optical total length of the wide-angle zoom lens; fw is the focal length at the wide-angle end of the wide-angle zoom lens when focused to infinity.

[0045] The present invention defines the ratio between the focal length and the total optical length at the wide-angle end of the optical system by using conditional formula (6) to achieve a balance between high performance and miniaturization.

[0046] If the ratio exceeds the upper limit, the total optical length will be too long, which will increase the aperture of the first lens group by 100, making it difficult to achieve the goal of miniaturization; conversely, if the ratio is below the lower limit, the total optical length will be too short, which will cause various aberrations to increase, especially the image plane curvature, making aberration correction difficult.

[0047] The following are embodiments of the ultra-compact day-night confocal wide-angle zoom lens provided by the present invention.

[0048] Example 1 Reference Figure 1 and Figure 2 As shown, the ultra-compact day and night confocal wide-angle zoom lens provided in this embodiment includes a first lens group 100, an aperture 200, a second lens group 300, and a third lens group 400 arranged sequentially from the object side to the image side.

[0049] In this embodiment, the first lens group 100 has a negative optical power, the second lens group 300 has a positive optical power, and the first and second lens groups 100 and 300 are adjustable along the optical axis from the object side to the image side to achieve zoom. The third lens group 400 is fixed relative to the image plane. The first lens group 100 includes a first lens 110, a second lens 120, and a third lens 130. The second lens group 300 includes a fourth lens 310, a fifth lens 320, a sixth lens 330, a seventh lens 340, an eighth lens 350, and a ninth lens 360. The third lens group 400 includes a tenth lens 410, and the image side of the tenth lens 410 also includes a flat lens as protective glass. The radius of curvature R (mm), spacing D (mm), refractive index Nd, and Abbe number ABV of each surface from the object side to the image side of the wide-angle zoom lens are shown in the table below.

[0050] Table 1

[0051] Among them, the first lens 110, the second lens 120 and the sixth lens 330 all have negative optical power, the third lens 130, the fourth lens 310, the fifth lens 320 and the ninth lens 360 all have positive optical power, one of the seventh lens 340 and the eighth lens 350 has negative optical power and the other lens has positive optical power, and the seventh lens 340 and the eighth lens 350 are glued together to form a cemented lens.

[0052] This embodiment achieves a miniaturized, high-resolution, large-aperture, and wide-angle zoom optical system by rationally setting parameters such as the radius of curvature R (mm), spacing D (mm), refractive index Nd, and Abbe number ABV of each lens, thus meeting market demands.

[0053] By adjusting the positions of the first lens group 100 and the second lens group 300, focusing can be achieved, and the lens can be adjusted from the telephoto end to the wide-angle end. The focal length f, aperture value Fno, half angle of view ω, the spacing D(6) of the 6th surface and the spacing D(18) of the 18th surface when the lens is adjusted to the wide-angle end and the telephoto end are shown in the table below: Table 2

[0054] As shown in Table 2, the optical system designed in this embodiment has an aperture value of F1.6 at the wide-angle end, achieving a large aperture, and a half field of view of 65.7651°, achieving wide-angle imaging.

[0055] Reference Figures 3 to 6 As shown, Figure 3 This is an aberration diagram showing spherical aberration, astigmatism, and distortion at the wide-angle end in this embodiment. Figure 4 This is an aberration diagram showing spherical aberration, astigmatism, and distortion at the telephoto end in this embodiment. Figure 5 This is the fan pattern at the wide-angle end of this embodiment. Figure 6 The image shown is the optical fan pattern at the telescope end in this embodiment. Straight lines represent light with a wavelength of 850.0000nm, dashed lines represent light with a wavelength of 656.2800nm, black dotted lines represent light with a wavelength of 486.1300nm, and blue dotted lines represent light with a wavelength of 453.8400nm, covering the wavelength range from visible light to near-infrared light.

[0056] Depend on Figures 3 to 6 It can be seen that the spherical aberration of the wide-angle zoom lens provided in this embodiment is maintained within 0.10mm from the wide-angle end to the telephoto end, astigmatism is maintained within 0.05mm, chromatic aberration is maintained within 0.05mm, and distortion is maintained within 10%. The distortion at the telephoto end can be reduced to a visible value. This embodiment achieves effective correction of spherical aberration, chromatic aberration, astigmatism, and distortion through the reasonable design and arrangement of the lenses, thereby improving the imaging quality and usage effect.

[0057] Example 2 Reference Figure 7 and Figure 8 The ultra-compact day and night confocal wide-angle zoom lens provided in this embodiment includes a first lens group 100, an aperture 200, a second lens group 300, and a third lens group 400 arranged sequentially from the object side to the image side.

[0058] In this embodiment, the first lens group 100 has a negative optical power, the second lens group 300 has a positive optical power, and the first and second lens groups 100 and 300 are adjustable along the optical axis from the object side to the image side to achieve zoom. The third lens group 400 is fixed relative to the image plane. The first lens group 100 includes a first lens 110, a second lens 120, and a third lens 130. The second lens group 300 includes a fourth lens 310, a fifth lens 320, a sixth lens 330, a seventh lens 340, an eighth lens 350, and a ninth lens 360. The third lens group 400 includes a tenth lens 410, and the image side of the tenth lens 410 also includes a flat lens as protective glass. The radius of curvature R (mm), spacing D (mm), refractive index Nd, and Abbe number ABV of each surface from the object side to the image side of the wide-angle zoom lens are shown in the table below.

[0059] Table 3

[0060] Among them, the first lens 110, the second lens 120 and the sixth lens 330 all have negative optical power, the third lens 130, the fourth lens 310, the fifth lens 320 and the ninth lens 360 all have positive optical power, one of the seventh lens 340 and the eighth lens 350 has negative optical power and the other lens has positive optical power, and the seventh lens 340 and the eighth lens 350 are glued together to form a cemented lens.

[0061] This embodiment achieves a miniaturized, high-resolution, large-aperture, and wide-angle zoom optical system by rationally setting parameters such as the radius of curvature R (mm), spacing D (mm), refractive index Nd, and Abbe number ABV of each lens, thus meeting market demands.

[0062] By adjusting the positions of the first lens group 100 and the second lens group 300, focusing can be achieved, and the lens can be adjusted from the telephoto end to the wide-angle end. The focal length f, aperture value Fno, half angle of view ω, the spacing D(6) of the 6th surface and the spacing D(18) of the 18th surface when the lens is adjusted to the wide-angle end and the telephoto end are shown in the table below: Table 4

[0063] As shown in Table 2, the optical system designed in this embodiment achieves a wide-angle aperture of F1.6, realizing a large aperture, while the half field of view reaches 68.1112°, realizing wide-angle imaging.

[0064] Reference Figures 9 to 12 As shown, Figure 9 This is an aberration diagram showing spherical aberration, astigmatism, and distortion at the wide-angle end in this embodiment. Figure 10 This is an aberration diagram showing spherical aberration, astigmatism, and distortion at the telephoto end in this embodiment. Figure 11This is the fan pattern at the wide-angle end of this embodiment. Figure 12 The image shown is the optical fan pattern at the telescope end in this embodiment. Straight lines represent light with a wavelength of 850.0000nm, dashed lines represent light with a wavelength of 656.2800nm, black dotted lines represent light with a wavelength of 486.1300nm, and blue dotted lines represent light with a wavelength of 453.8400nm, covering the wavelength range from visible light to near-infrared light.

[0065] Depend on Figures 9 to 12 It can be seen that the spherical aberration of the wide-angle zoom lens provided in this embodiment is maintained within 0.05mm from the wide-angle end to the telephoto end, astigmatism is maintained within 0.01mm, chromatic aberration is maintained within 0.05mm, and distortion is maintained within 60%. The distortion at the telephoto end can be reduced to within 7%. It can be seen that this embodiment achieves effective correction of spherical aberration, chromatic aberration, astigmatism, distortion, etc. through the reasonable design and arrangement of the lens, thereby improving the imaging quality and usage effect.

[0066] The present invention also provides an imaging device, which includes the aforementioned ultra-compact day and night confocal wide-angle zoom lens. It is understood that the contents of the aforementioned ultra-compact day and night confocal wide-angle zoom lens embodiment are applicable to the present imaging device embodiment. The specific functions implemented by the present imaging device are the same as those of the aforementioned ultra-compact day and night confocal wide-angle zoom lens embodiment, and the beneficial effects achieved are also the same as those achieved by the aforementioned ultra-compact day and night confocal wide-angle zoom lens embodiment.

[0067] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0069] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A compact wide-angle zoom lens with day and night confocal focus, characterized in that, include: A first lens group, a second lens group, and a third lens group are arranged sequentially from the object side to the image side. The optical power of the first lens group is negative, and the optical power of the second lens group is positive. The first lens group and the second lens group are adjustable along the optical axis from the object side to the image side to achieve zoom. The third lens group is fixed relative to the image plane. The first lens group includes a first lens, a second lens, and a third lens; the second lens group includes a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens; and the third lens group includes a tenth lens. The first, second, and sixth lenses all have negative optical power, while the third, fourth, fifth, and ninth lenses all have positive optical power. One of the seventh and eighth lenses has negative optical power, and the other has positive optical power. The seventh and eighth lenses are cemented together to form a cemented lens.

2. The wide-angle zoom lens according to claim 1, characterized in that: The second lens, the third lens, the fifth lens, the sixth lens, the ninth lens, and the tenth lens are aspherical lenses.

3. The wide-angle zoom lens according to claim 2, characterized in that: The second lens, the third lens, the fifth lens, the sixth lens, the ninth lens, and the tenth lens are resin lenses.

4. The wide-angle zoom lens according to claim 1, characterized in that: An aperture is provided between the first lens group and the second lens group.

5. The wide-angle zoom lens according to claim 4, characterized in that: The aperture stop is fixed relative to the second lens group, and the aperture stop moves with the second lens group when zooming.

6. The wide-angle zoom lens according to claim 1, characterized in that: The first lens group satisfies the following condition: 2.0 < |fL1 / fw| < 3.5; 2.0 < |fL2 / fw| < 3.5; 0.8 < |fL12 / fw| < 1.5; Wherein, fL1 is the focal length of the first lens in the first lens group; fL2 is the focal length of the second lens in the first lens group; fL12 is the combined focal length of the first lens and the second lens; and fw is the focal length at the wide-angle end of the wide-angle zoom lens when focused to infinity.

7. The wide-angle zoom lens according to claim 1, characterized in that: The second lens group satisfies the following condition: 2.0 < f²x / fw < 6.0; Where f2x is the focal length of any one of the fourth and fifth lenses; fw is the focal length at the wide-angle end when focusing at infinity.

8. The wide-angle zoom lens according to claim 7, characterized in that: The characteristics of the second lens group satisfy the following condition: 75.496≦VdA; Wherein, VdA is the average Abbe number of positive diopter lenses other than resin lenses in the second lens group.

9. The wide-angle zoom lens according to claim 1, characterized in that: The wide-angle zoom lens satisfies the following condition: 7.4 ≤ TTL / fw ≤ 13.3; Wherein, TTL is the total optical length of the wide-angle zoom lens; fw is the focal length at the wide-angle end of the wide-angle zoom lens when focused to infinity.

10. An imaging device, characterized in that, The imaging device includes a wide-angle zoom lens as described in any one of claims 1 to 9.

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