Lens and camera device

Abstract

The present invention discloses a lens and an imaging device, which are composed of a first fixed group, a first movable group, a second fixed group, a second movable group, a third fixed group, and a spectrometer, which are arranged in sequence from the object side to the image side. Each light-emitting side of the spectrometer includes a filter and an image plane in sequence. #imgabs0##imgabs1##imgabs2#An optical lens achieves a large light throughput and separate color and black-and-white imaging.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging technology, and in particular to a lens and a camera device. Background Art

[0002] Thanks to the rapid development of security surveillance in recent years, optical lenses are increasingly being used in this field, particularly in smart buildings and intelligent transportation. The pixel requirements for optical imaging lenses are becoming increasingly higher. More and more companies are investing in ultra-high-definition research, hoping to develop products with higher pixels and smaller dimensions. With the rapid development of the security field, the use of zoom lenses has increased year by year, and the requirements for their optical performance and product stability are also becoming increasingly stringent.

[0003] With the development of society, the integration of security surveillance and artificial intelligence has brought great convenience to people's lives. Currently, most lenses used in security systems are mainly available in color and black and white modes. Their color reproduction capabilities are poor at night, or they use infrared fill light to provide black and white images. This cannot meet the growing demand for intelligent and night-time color images. Therefore, there is an urgent need for an optical lens with high light throughput and separate color and black and white imaging. Summary of the Invention

[0004] The embodiments of the present invention provide a lens and a camera device, which are used to provide an optical lens with large light throughput and capable of imaging in color and black and white.

[0005] An embodiment of the present invention provides a lens, comprising a first fixed group, a first movable group, a second fixed group, a second movable group, a third fixed group, and a beam splitter, arranged in sequence from the object side to the image side; each light-emitting side of the beam splitter comprises a filter and an image plane;

[0006] The lens meets the following conditions:

[0007]

[0008]

[0009]

[0010]

[0011]

[0012]

[0013]

[0014]

[0015]

[0016]

[0017] Wherein, f1 is the focal length of the first fixed group, f2 is the focal length of the first moving group, f3 is the focal length of the second fixed group, f4 is the focal length of the second moving group, f5 is the focal length of the third fixed group, and f w is the focal length of the lens in the short-focus state, f t is the focal length of the lens in telephoto state.

[0018] Furthermore, the first fixed group is composed of a positive power lens G1, a positive power lens G2 and a positive power lens G3 arranged in sequence from the object side to the image side;

[0019] The first moving group is composed of a negative power lens G4, a negative power lens G5 and a positive power lens G6 arranged in sequence from the object side to the image side;

[0020] The second fixed group is composed of an aperture stop, a positive power lens G7, a negative power lens G8, a positive power lens G9, a negative power lens G10, and a positive power lens G11, which are arranged in sequence from the object side to the image side;

[0021] The second moving group is composed of a positive power lens G12 and a negative power lens G13 arranged in sequence from the object side to the image side;

[0022] The third fixed group is composed of a negative power lens G14 and a positive power lens G15 arranged in sequence from the object side to the image side.

[0023] Furthermore, the positive power lens G1 is a meniscus lens, and its surface facing the object side is convex;

[0024] The positive power lens G2 is a biconvex lens;

[0025] The positive power lens G3 is a meniscus lens, the surface of which facing the object side is convex;

[0026] The negative power lens G4 is a biconcave lens;

[0027] The negative power lens G5 is a biconcave lens;

[0028] The positive power lens G6 is a meniscus lens, the surface of which facing the object side is convex;

[0029] The positive power lens G7 is a biconvex lens;

[0030] The negative power lens G8 is a biconcave lens;

[0031] The positive power lens G9 is a biconvex lens;

[0032] The negative power lens G10 is a meniscus lens, the surface of which facing the object side is concave;

[0033] The positive power lens G11 is a biconvex lens;

[0034] The positive power lens G12 is a biconvex lens;

[0035] The negative power lens G13 is a meniscus lens, the surface of which facing the object side is concave;

[0036] The negative power lens G14 is a meniscus lens, the surface of which facing the object side is convex;

[0037] The positive power lens G15 is a biconvex lens.

[0038] Furthermore, the positive power lens G1 and the positive power lens G2 form a cemented lens group;

[0039] The positive power lens G9 and the negative power lens G10 form a cemented lens group;

[0040] The negative power lens G14 and the positive power lens G15 form a cemented lens group.

[0041] Furthermore, the first fixed group is composed of a positive power lens G1, a positive power lens G2 and a positive power lens G3 arranged in sequence from the object side to the image side;

[0042] The first moving group is composed of a negative power lens G4, a positive power lens G5 and a negative power lens G6 arranged in sequence from the object side to the image side;

[0043] The second fixed group is composed of an aperture stop, a negative power lens G7, a positive power lens G8, a positive power lens G9, and a negative power lens G10, which are arranged in sequence from the object side to the image side;

[0044] The second moving group is composed of a positive power lens G11, a positive power lens G12, a positive power lens G13, a negative power lens G14 and a positive power lens G15 arranged in sequence from the object side to the image side;

[0045] The third fixed group is composed of a negative power lens G16 and a positive power lens G17 arranged in sequence from the object side to the image side.

[0046] Furthermore, the positive power lens G1 is a meniscus lens, and its surface facing the object side is convex;

[0047] The positive power lens G2 is a biconvex lens;

[0048] The positive power lens G3 is a meniscus lens, the surface of which facing the object side is convex;

[0049] The negative power lens G4 is a meniscus lens, the surface of which facing the object side is convex;

[0050] The positive power lens G5 is a biconcave lens;

[0051] The negative power lens G6 is a meniscus lens, the surface of which facing the object side is convex;

[0052] The negative power lens G7 is a plano-concave lens, and its surface facing the object side is concave;

[0053] The positive power lens G8 is a plano-convex lens, and its image-facing surface is convex;

[0054] The positive power lens G9 is a biconvex lens;

[0055] The negative power lens G10 is a biconcave lens;

[0056] The positive power lens G11 is a plano-convex lens, and its surface facing the object side is convex;

[0057] The positive power lens G12 is a biconvex lens;

[0058] The positive power lens G13 is a biconvex lens;

[0059] The negative power lens G14 is a biconcave lens;

[0060] The positive power lens G15 is a biconvex lens;

[0061] The negative power lens G16 is a biconcave lens;

[0062] The positive power lens G17 is a biconvex lens.

[0063] Furthermore, the positive power lens G12 and the positive power lens G15 are aspherical lenses.

[0064] Furthermore, the positive power lens G1 and the positive power lens G2 form a cemented lens group;

[0065] The negative power lens G7 and the positive power lens G8 form a cemented lens group;

[0066] The positive power lens G9 and the negative power lens G10 form a cemented lens group;

[0067] The positive power lens G13 and the negative power lens G14 form a cemented lens group.

[0068] Furthermore, the clear aperture Φ1 of the positive power lens G1 and the total optical length TTL of the lens satisfy:

[0069] Furthermore, the relative displacement of the first mobile group is ΔZ and the total optical length TTL of the lens satisfies:

[0070] Furthermore, the relative displacement of the second mobile group is ΔF and the total optical length TTL of the lens satisfies:

[0071] Furthermore, the maximum aperture diameter Φ2 of the aperture stop and the focal length f of the lens in the short focus state are w The focal length f of the lens in telephoto state t satisfy:

[0072] Furthermore, the refractive index V of each lens in the lens is d Satisfy: 17.9≤V d ≤81.6.

[0073] Furthermore, the Abbe number N of each lens in the lens d Satisfies: 1.49≤N d ≤2.0.

[0074] On the other hand, an embodiment of the present invention provides a camera device, which is equipped with: using any one of the lenses described above to perform imaging.

[0075] An embodiment of the present invention provides a lens and an imaging device. The lens comprises a first fixed group, a first movable group, a second fixed group, a second movable group, a third fixed group, and a spectrometer, arranged in sequence from the object side to the image side. Each light-emitting side of the spectrometer includes a filter and an image plane. The lens meets the following conditions: Wherein, f1 is the focal length of the first fixed group, f2 is the focal length of the first moving group, f3 is the focal length of the second fixed group, f4 is the focal length of the second moving group, f5 is the focal length of the third fixed group, and f w is the focal length of the lens in the short-focus state, f t is the focal length of the lens in telephoto state.

[0076] In the embodiment of the present invention, five lens groups are arranged in a specific order from the object side to the image side in the lens, the first movable group and the second movable group can move along the optical axis to achieve lens zooming, a beam splitter is provided on the image side of the third fixed group, and the lens satisfies the following conditions: An optical lens with large light throughput and separate color and black and white imaging is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] 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 description of the embodiments. 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.

[0078] Figure 1 A flowchart of lens image acquisition and dual-channel fusion provided by an embodiment of the present invention;

[0079] Figure 2 A schematic diagram of a lens structure provided by an embodiment of the present invention;

[0080] Figure 3 A schematic diagram of a lens structure provided in Example 1 of the present invention;

[0081] Figure 4 A schematic diagram of a lens structure provided in Example 2 of the present invention;

[0082] Figure 5 This is a schematic structural diagram of the lens provided in Example 1 of the present invention in a wide-angle (short-focus) state;

[0083] Figure 6 This is a graph showing the optical transfer function (MTF) of the lens provided in Example 1 of the present invention in the wide-angle state at room temperature in the visible light band;

[0084] Figure 7 This is a graph showing the through-focus MTF curve of the lens provided in Example 1 of the present invention in the visible light band at wide-angle state;

[0085] Figure 8 A defocus MTF curve of the lens provided in Example 1 of the present invention in the wide-angle state at normal temperature in the infrared band;

[0086] Figure 9 This is a diagram of field curvature distortion of the lens in wide-angle state provided by Example 1 of the present invention;

[0087] Figure 10This is a schematic structural diagram of the lens provided in Example 1 of the present invention in the middle focal length state;

[0088] Figure 11 This is a graph of the optical transfer function (MTF) of the lens provided in Example 1 of the present invention at an intermediate focal length and at room temperature in the visible light band;

[0089] Figure 12 A through-focus MTF curve diagram of the lens provided in Example 1 of the present invention in the visible light band at an intermediate focal length;

[0090] Figure 13 A through-focus MTF curve of the lens provided in Example 1 of the present invention at an intermediate focal length and at room temperature in the infrared band;

[0091] Figure 14 A field curvature distortion diagram of the lens at the middle focal length provided by Example 1 of the present invention;

[0092] Figure 15 This is a schematic structural diagram of the lens provided in Example 1 of the present invention in telephoto state;

[0093] Figure 16 This is a graph of the optical transfer function (MTF) of the lens provided in Example 1 of the present invention in telephoto state at room temperature in the visible light band;

[0094] Figure 17 A through-focus MTF curve diagram of the lens in the telephoto state in the visible light band provided by Example 1 of the present invention;

[0095] Figure 18 A through-focus MTF curve of the lens provided in Example 1 of the present invention in the telephoto state at room temperature in the infrared band;

[0096] Figure 19 This is a diagram of field curvature distortion of the lens in telephoto state provided by Example 1 of the present invention. DETAILED DESCRIPTION

[0097] The present invention will be further described in detail below with reference to the accompanying drawings. It is apparent that the embodiments described are only some, not all, of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0098] Figure 1The present invention provides a flowchart for lens image acquisition and dual-path fusion. A camera including the lens of the present invention is used to acquire an image. The image gain of the visible path image sensor is detected to determine whether it is less than a set threshold A. If so, the visible path sensor image is acquired and a color image is output. If not, the visible path sensor image color is acquired, and the infrared path sensor image details are acquired. The visible path sensor image color and the infrared path sensor image details are fused to output a color image.

[0099] Figure 2 A schematic diagram of a lens structure provided in an embodiment of the present invention comprises a first fixed group L1, a first movable group L2, a second fixed group L3, a second movable group L4, a third fixed group L5, and a beam splitter Q, arranged in sequence from the object side to the image side. Each light-emitting side of the beam splitter Q includes a filter M and an image plane N.

[0100] The lens meets the following conditions:

[0101]

[0102]

[0103]

[0104]

[0105]

[0106]

[0107]

[0108]

[0109]

[0110]

[0111] Wherein, f1 is the focal length of the first fixed group, f2 is the focal length of the first moving group, f3 is the focal length of the second fixed group, f4 is the focal length of the second moving group, f5 is the focal length of the third fixed group, and f w is the focal length of the lens in the short-focus state, f t is the focal length of the lens in telephoto state.

[0112] This lens can achieve zooming by changing the positions of the first and second moving groups. In this lens, the first and second moving groups can move along the optical axis to achieve zooming. In other words, the first moving group can move between the first and second fixed groups. The second moving group can move between the second and third fixed groups. The first, second, and third fixed groups are fixed in position.

[0113] The first moving group moves along the optical axis to achieve zooming, and is referred to as the zoom group or variator group. Furthermore, the second moving group is moved along the optical axis to compensate for the image point movement caused by the second moving group, minimizing the image point movement at the image plane. This allows zooming without image plane movement, and is referred to as the compensation group. Furthermore, when the object of interest moves, fine-tuning the second moving group maintains image focus. In summary, within the lens system, the second moving group serves as both a compensation group and a focusing group.

[0114] The light splitting device includes two prisms, and a film layer with light splitting function is provided on the joint surface of the two prisms.

[0115] Figure 3 This is a schematic diagram of the lens structure provided in Example 1 of the present application. In Example 1, the first fixed group is composed of a positive power lens G1, a positive power lens G2, and a positive power lens G3 arranged in sequence from the object side to the image side;

[0116] The first moving group is composed of a negative power lens G4, a negative power lens G5 and a positive power lens G6 arranged in sequence from the object side to the image side;

[0117] The second fixed group is composed of an aperture stop, a positive power lens G7, a negative power lens G8, a positive power lens G9, a negative power lens G10, and a positive power lens G11, which are arranged in sequence from the object side to the image side;

[0118] The second moving group is composed of a positive power lens G12 and a negative power lens G13 arranged in sequence from the object side to the image side;

[0119] The third fixed group is composed of a negative power lens G14 and a positive power lens G15 arranged in sequence from the object side to the image side.

[0120] The positive power lens G1 is a meniscus lens, the surface of which facing the object side is convex;

[0121] The positive power lens G2 is a biconvex lens;

[0122] The positive power lens G3 is a meniscus lens, the surface of which facing the object side is convex;

[0123] The negative power lens G4 is a biconcave lens;

[0124] The negative power lens G5 is a biconcave lens;

[0125] The positive power lens G6 is a meniscus lens, the surface of which facing the object side is convex;

[0126] The positive power lens G7 is a biconvex lens;

[0127] The negative power lens G8 is a biconcave lens;

[0128] The positive power lens G9 is a biconvex lens;

[0129] The negative power lens G10 is a meniscus lens, the surface of which facing the object side is concave;

[0130] The positive power lens G11 is a biconvex lens;

[0131] The positive power lens G12 is a biconvex lens;

[0132] The negative power lens G13 is a meniscus lens, the surface of which facing the object side is concave;

[0133] The negative power lens G14 is a meniscus lens, the surface of which facing the object side is convex;

[0134] The positive power lens G15 is a biconvex lens.

[0135] The positive power lens G1 and the positive power lens G2 form a cemented lens group;

[0136] The positive power lens G9 and the negative power lens G10 form a cemented lens group;

[0137] The negative power lens G14 and the positive power lens G15 form a cemented lens group.

[0138] Figure 4 This is a schematic diagram of the lens structure provided in Example 2 of the present application, wherein the first fixed group is composed of a positive power lens G1, a positive power lens G2, and a positive power lens G3 arranged in sequence from the object side to the image side;

[0139] The first moving group is composed of a negative power lens G4, a positive power lens G5 and a negative power lens G6 arranged in sequence from the object side to the image side;

[0140] The second fixed group is composed of an aperture stop, a negative power lens G7, a positive power lens G8, a positive power lens G9, and a negative power lens G10, which are arranged in sequence from the object side to the image side;

[0141] The second moving group is composed of a positive power lens G11, a positive power lens G12, a positive power lens G13, a negative power lens G14 and a positive power lens G15 arranged in sequence from the object side to the image side;

[0142] The third fixed group is composed of a negative power lens G16 and a positive power lens G17 arranged in sequence from the object side to the image side.

[0143] The positive power lens G1 is a meniscus lens, the surface of which facing the object side is convex;

[0144] The positive power lens G2 is a biconvex lens;

[0145] The positive power lens G3 is a meniscus lens, the surface of which facing the object side is convex;

[0146] The negative power lens G4 is a meniscus lens, the surface of which facing the object side is convex;

[0147] The positive power lens G5 is a biconcave lens;

[0148] The negative power lens G6 is a meniscus lens, the surface of which facing the object side is convex;

[0149] The negative power lens G7 is a plano-concave lens, and its surface facing the object side is concave;

[0150] The positive power lens G8 is a plano-convex lens, and its image-facing surface is convex;

[0151] The positive power lens G9 is a biconvex lens;

[0152] The negative power lens G10 is a biconcave lens;

[0153] The positive power lens G11 is a plano-convex lens, and its surface facing the object side is convex;

[0154] The positive power lens G12 is a biconvex lens;

[0155] The positive power lens G13 is a biconvex lens;

[0156] The negative power lens G14 is a biconcave lens;

[0157] The positive power lens G15 is a biconvex lens;

[0158] The negative power lens G16 is a biconcave lens;

[0159] The positive power lens G17 is a biconvex lens.

[0160] The positive power lens G12 and the positive power lens G15 are aspherical lenses.

[0161] The positive power lens G1 and the positive power lens G2 form a cemented lens group;

[0162] The negative power lens G7 and the positive power lens G8 form a cemented lens group;

[0163] The positive power lens G9 and the negative power lens G10 form a cemented lens group;

[0164] The positive power lens G13 and the negative power lens G14 form a cemented lens group.

[0165] Example 1 and Example 2 meet the following requirements:

[0166] The clear aperture Φ1 of the positive power lens G1 and the total optical length TTL of the lens satisfy: The relative displacement of the first mobile group is ΔZ and the total optical length TTL of the lens satisfies: The relative displacement of the second moving group is ΔF and the total optical length TTL of the lens satisfies: The maximum aperture diameter Φ2 of the aperture stop, the focal length f of the lens in the short focus state w The focal length f of the lens in telephoto state t satisfy: The refractive index V of each lens in the lens d Satisfy: 17.9≤V d ≤81.6. The Abbe number N of each lens in the lens d Satisfies: 1.49≤N d ≤2.0.

[0167] The present application provides a camera device, which is equipped with: using the above-mentioned lens to perform imaging.

[0168] The aperture size of the aperture diaphragm determines the aperture value of the system and the depth of field during shooting. Its aperture size can be fixed, or an aperture diaphragm with adjustable aperture can be placed as needed to achieve adjustable light-transmitting aperture, that is, to achieve the purpose of variable system aperture value and changing depth of field.

[0169] A filter is an optical device used to select the desired radiation band. By setting the filter, the filter in the imaging system equipped with the lens provided by the embodiment of the present invention is simulated. In this way, the optical path difference of the filter in the imaging system is taken into account in the lens design, and the lens satisfies:

[0170] The lens performs better when

[0171] The present invention provides a dual-optical path zoom lens and imaging device comprising, from the object side to the image side, a first fixed group with positive optical power, a first movable group with positive optical power, a second fixed group with positive optical power, a second movable group with negative optical power, a third fixed group with positive optical power, a spectrometer, a color filter, a color sensor, an infrared filter, and an infrared sensor. The fixed group is fixed within the lens barrel, while the movable group enables zooming.

[0172] In the embodiment of the present invention, five lens groups are arranged in a specific order from the object side to the image side in the lens, the first movable group and the second movable group can move along the optical axis to achieve lens zooming, a beam splitter is provided on the image side of the third fixed group, and the lens satisfies the following conditions:

[0173] An optical lens with large light throughput and separate color and black and white imaging is realized.

[0174] Example 1:

[0175] In a specific implementation process, the curvature radius R, center thickness Tc, refractive index Nd, and Abbe constant Vd of each lens of the lens meet the conditions listed in Table 1:

[0176]

[0177]

[0178]

[0179] Table 1

[0180] Among them, lenses G1 and G2 are a cemented assembly, lenses G9 and G10 are a cemented assembly, and lenses G14 and G15 are a cemented assembly.

[0181] The focal length of the lens at the wide-angle (short-focus) end is f w , the focal length of the lens at the telephoto end is f t , the focal length of fixed group 1 is f1, the focal length of mobile group 1 is f2, the focal length of fixed group 2 is f3, the focal length of mobile group 2 is f4, and the focal length of fixed group 3 is f5, satisfying the following relationship:

[0182]

[0183]

[0184]

[0185]

[0186]

[0187]

[0188]

[0189]

[0190]

[0191]

[0192] The effective aperture of the first positive angle lens of the lens is Φ1, and the total optical length of the lens is TTL, which must satisfy the following formula:

[0193] The first movable group of the lens can move between the first fixed group and the second fixed group to change the focal length of the lens from wide angle to telephoto. The relative displacement of the first movable group is ΔZ. The total optical length of the lens is TTL, which must satisfy the following formula:

[0194] The second movable group of the lens can move between the second fixed group and the third fixed group. As the position of the second movable group changes, the lens image plane can remain stationary. The relative displacement of the second movable group is ΔF. The total optical length of the lens is TTL and must satisfy the following formula:

[0195] The aperture diaphragm of the lens is located between lenses G6 and G7. The maximum clear hole diameter of the aperture diaphragm is Φ2. It can be set to a fixed size or adjustable, and must satisfy the following formula:

[0196]

[0197] The lens provided in this embodiment has the following optical technical indicators:

[0198] Lens focal length range: f7.6~26mm;

[0199] Total optical length of lens: TTL≤90.5mm;

[0200] Aperture FNO of the lens system: F1.60~1.69;

[0201] Lens image size: ≥1 / 1.8".

[0202] The following detailed analysis of the embodiment further describes the imaging system provided by this embodiment. The first mobile group moves between the first and second fixed groups to adjust the focal length of the lens system. The second mobile group follows the first mobile group and moves between the second and third fixed groups, ensuring that the imaging plane remains stationary and the image remains clearly focused.

[0203] The optical transfer function is a relatively accurate, intuitive, and common method for evaluating the imaging quality of an imaging system. The higher and smoother the curve is, the better the imaging quality of the system is, and the better the correction is for various aberrations (such as spherical aberration, coma, astigmatism, field curvature, axial chromatic aberration, vertical chromatic aberration, etc.).

[0204] like Figure 6 、 11 , 16, is the optical transfer function (MTF) curve of the imaging system in the visible light band at room temperature; Figure 7 、 12 , 17, is the defocus MTF of the imaging system in the visible light band; Figure 8 、 13 , 18, is the defocus MTF of the imaging system at room temperature in the infrared band, as shown in Figure 9 、 14 , 19 show the field curvature distortion diagram of the imaging system.

[0205] from Figure 6 、 11 16, it can be seen that the optical transfer function (MTF) curves of the imaging system at short focal lengths, intermediate focal lengths, and long focal lengths in the visible light portion at room temperature are relatively smooth and concentrated, and the average MTF value over the entire field of view (half-image height Y'=4.4mm) is above 0.5. It can be seen that the imaging system provided in this embodiment can achieve very high resolution and meet the imaging requirements of a 1 / 1.8-inch 8-megapixel camera.

[0206] from Figure 7 、 12 , 17 and Figure 8 、 13 As can be seen from Figure 18, the visible and infrared defocus of the imaging system is small within 0.02mm, and the visible and infrared can be focused clearly at the same time. It can be concluded that the infrared confocal of the imaging system can meet the needs of day and night scenes.

[0207] The distortion of the imaging system is within -12.6% of the entire field of view, which is relatively small; the field curvature is controlled within ±0.05mm, which is relatively small.

[0208] Figure 5 This is a schematic structural diagram of the lens provided by the present invention in a wide-angle (short-focus) state;

[0209] Figure 6 This is a graph of the optical transfer function (MTF) of the lens provided by the present invention in the wide-angle state at room temperature in the visible light band;

[0210] Figure 7 This is a graph of the defocus MTF curve of the lens provided by the present invention in the visible light band at wide angle;

[0211] Figure 8 This is a defocus MTF curve diagram of the lens provided by the present invention in the wide-angle state at normal temperature in the infrared band;

[0212] Figure 9 This is a field curvature distortion diagram of the lens provided by the present invention in the wide-angle state;

[0213] Figure 10 This is a schematic structural diagram of the lens provided by the present invention in the middle focal length state;

[0214] Figure 11 This is a graph of the optical transfer function (MTF) of the lens provided by the present invention at an intermediate focal length in the visible light band and at room temperature;

[0215] Figure 12 This is a through-focus MTF curve diagram of the lens provided by the present invention in the visible light band at the middle focal length state;

[0216] Figure 13 This is a defocus MTF curve diagram of the lens provided by the present invention at the middle focal length in the infrared band and normal temperature;

[0217] Figure 14 A field curvature distortion diagram of the lens provided by the present invention at the middle focal length;

[0218] Figure 15 This is a schematic structural diagram of the lens provided by the present invention in telephoto state;

[0219] Figure 16 This is a graph of the optical transfer function (MTF) of the lens provided by the present invention in the telephoto state at room temperature in the visible light band;

[0220] Figure 17 This is a through-focus MTF curve graph of the lens provided by the present invention in the visible light band in the telephoto state;

[0221] Figure 18 This is a defocus MTF curve graph of the lens provided by the present invention in the telephoto state at normal temperature in the infrared band;

[0222] Figure 19 This is a diagram of field curvature distortion in the telephoto state of the lens provided by the present invention.

[0223] Example 2:

[0224] In a specific implementation process, the curvature radius R, center thickness Tc, refractive index Nd, and Abbe constant Vd of each lens of the lens meet the conditions listed in Table 2:

[0225]

[0226]

[0227] Table 2

[0228] It should be noted that the mirror numbers in Table 2 are Figure 2 In the lens structure diagram shown, the surface numbers of the lenses from left to right.

[0229] Its aspheric cone coefficient can be defined by the following aspheric surface shape equation, but is not limited to the following expression:

[0230]

[0231] Among them, Z is the distance vector height from the aspheric surface vertex when the aspheric surface is at a height of y along the optical axis; c is the curvature of the fitting sphere, which is the reciprocal of the curvature radius, that is, c = 1 / R, where R represents the paraxial curvature radius of the mirror; k is the cone coefficient; A, B, C, D, E, and F are high-order aspheric coefficients.

[0232] Table 3 shows the design values ​​of the aspheric coefficients of each lens in the lens.

[0233]

[0234] Table 3

[0235] Among them, lenses G1 and G2 are a cemented assembly, lenses G7 and G8 are a cemented assembly, lenses G9 and G10 are a cemented assembly, and lenses G13 and G14 are a cemented assembly.

[0236] The focal length of the lens at the wide-angle end is f w , the focal length of the lens at the telephoto end is f t The focal length of the first fixed group is f1, the focal length of the first mobile group is f2, the focal length of the second fixed group is f3, the focal length of the second mobile group is f4, and the focal length of the third fixed group is f5, satisfying the following relationship:

[0237] The effective aperture of the first positive angle lens of the lens is Φ1, and the total optical length of the lens is TTL, which must satisfy the following formula:

[0238] The relative displacement of the first moving group is ΔZ, and the total optical length of the lens is TTL, which must satisfy the following formula:

[0239] The relative displacement of the second moving group of the lens is ΔF, and the total optical length of the lens is TTL, which must satisfy the following formula:

[0240] The aperture diaphragm of the lens is located between lenses G6 and G7. The maximum clear hole diameter of the aperture diaphragm is Φ2. It can be set to a fixed size or adjustable, and must satisfy the following formula:

[0241]

[0242] The lens provided in this embodiment has the following optical technical indicators:

[0243] Lens focal length range: f9.5~32.3mm;

[0244] Total optical length of lens: TTL≤98.5mm;

[0245] Aperture FNO of the lens system: F1.25~1.30;

[0246] Lens image size: ≥1 / 1.8".

[0247] The imaging system's optical transfer function (MTF) curves for short, intermediate, and long focal lengths in the visible light region at room temperature are relatively smooth and concentrated, and the average MTF value for the entire field of view (half-image height Y' = 4.5mm) exceeds 0.5. This shows that the imaging system provided by this embodiment can achieve very high resolution, meeting the imaging requirements of a 1 / 1.8-inch 8-megapixel camera. The imaging system's visible and infrared defocus is relatively small, within 0.02mm, and the visible and infrared can be clearly focused simultaneously, indicating that the imaging system's infrared confocal properties can meet the requirements of both day and night use. The imaging system's distortion is relatively low, within -5.2% for the entire field of view, and the field curvature is controlled within ±0.05mm, indicating minimal field curvature.

[0248] The lens provided by this invention maintains a constant aperture from wide-angle to telephoto zoom, allowing for high light throughput throughout the entire focal range, ensuring low-light conditions at night. The imaging surface supports sensors up to 1 / 1.8 inches (CCD / CMOS), and the total system length does not exceed 98.5 mm, meeting the requirements of miniaturized AI capture. The full-field MTF value reaches over 0.45 at 100 lp / mm, effectively meeting the resolution requirements of current 8-megapixel cameras. The lens's design incorporates infrared confocality, ensuring simultaneous clarity of both visible and infrared images, enabling dual-image fusion.

[0249] An embodiment of the present invention provides a lens and an imaging device. The lens comprises a first fixed group, a first movable group, a second fixed group, a second movable group, a third fixed group, and a spectrometer, arranged in sequence from the object side to the image side. Each light-emitting side of the spectrometer includes a filter and an image plane. The lens meets the following conditions: Wherein, f1 is the focal length of the first fixed group, f2 is the focal length of the first moving group, f3 is the focal length of the second fixed group, f4 is the focal length of the second moving group, f5 is the focal length of the third fixed group, and f w is the focal length of the lens in the short-focus state, f t is the focal length of the lens in telephoto state.

[0250] In the embodiment of the present invention, five lens groups are arranged in a specific order from the object side to the image side in the lens, the first movable group and the second movable group can move along the optical axis to achieve lens zooming, a beam splitter is provided on the image side of the third fixed group, and the lens satisfies the following conditions: An optical lens with large light throughput and separate color and black and white imaging is realized.

[0251] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0252] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0253] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0254] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0255] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A lens, characterized in that: The lens is composed of a first fixed group, a first movable group, a second fixed group, a second movable group, a third fixed group and a light splitting device arranged in sequence from the object side to the image side; each light-emitting side of the light splitting device includes a filter and an image plane in sequence; The lens meets the following conditions: Wherein, f1 is the focal length of the first fixed group, f2 is the focal length of the first moving group, f3 is the focal length of the second fixed group, f4 is the focal length of the second moving group, f5 is the focal length of the third fixed group, and f w is the focal length of the lens in the short-focus state, f t is the focal length of the lens in telephoto state.

2. The lens according to claim 1, wherein: The first fixed group is composed of a positive power lens G1, a positive power lens G2, and a positive power lens G3 arranged in sequence from the object side to the image side; The first moving group is composed of a negative power lens G4, a negative power lens G5 and a positive power lens G6 arranged in sequence from the object side to the image side; The second fixed group is composed of an aperture stop, a positive power lens G7, a negative power lens G8, a positive power lens G9, a negative power lens G10, and a positive power lens G11, which are arranged in sequence from the object side to the image side; The second moving group is composed of a positive power lens G12 and a negative power lens G13 arranged in sequence from the object side to the image side; The third fixed group is composed of a negative power lens G14 and a positive power lens G15 arranged in sequence from the object side to the image side.

3. The lens according to claim 2, wherein: The positive power lens G1 is a meniscus lens, the surface of which facing the object side is convex; The positive power lens G2 is a biconvex lens; The positive power lens G3 is a meniscus lens, the surface of which facing the object side is convex; The negative power lens G4 is a biconcave lens; The negative power lens G5 is a biconcave lens; The positive power lens G6 is a meniscus lens, the surface of which facing the object side is convex; The positive power lens G7 is a biconvex lens; The negative power lens G8 is a biconcave lens; The positive power lens G9 is a biconvex lens; The negative power lens G10 is a meniscus lens, the surface of which facing the object side is concave; The positive power lens G11 is a biconvex lens; The positive power lens G12 is a biconvex lens; The negative power lens G13 is a meniscus lens, the surface of which facing the object side is concave; The negative power lens G14 is a meniscus lens, the surface of which facing the object side is convex; The positive power lens G15 is a biconvex lens.

4. The lens according to claim 2, wherein: The positive power lens G1 and the positive power lens G2 form a cemented lens group; The positive power lens G9 and the negative power lens G10 form a cemented lens group; The negative power lens G14 and the positive power lens G15 form a cemented lens group.

5. The lens according to claim 1, wherein: The first fixed group is composed of a positive power lens G1, a positive power lens G2, and a positive power lens G3 arranged in sequence from the object side to the image side; The first moving group is composed of a negative power lens G4, a positive power lens G5 and a negative power lens G6 arranged in sequence from the object side to the image side; The second fixed group is composed of an aperture stop, a negative power lens G7, a positive power lens G8, a positive power lens G9, and a negative power lens G10, which are arranged in sequence from the object side to the image side; The second moving group is composed of a positive power lens G11, a positive power lens G12, a positive power lens G13, a negative power lens G14 and a positive power lens G15 arranged in sequence from the object side to the image side; The third fixed group is composed of a negative power lens G16 and a positive power lens G17 arranged in sequence from the object side to the image side.

6. The lens according to claim 5, wherein: The positive power lens G1 is a meniscus lens, the surface of which facing the object side is convex; The positive power lens G2 is a biconvex lens; The positive power lens G3 is a meniscus lens, the surface of which facing the object side is convex; The negative power lens G4 is a meniscus lens, the surface of which facing the object side is convex; The positive power lens G5 is a biconcave lens; The negative power lens G6 is a meniscus lens, the surface of which facing the object side is convex; The negative power lens G7 is a plano-concave lens, and its surface facing the object side is concave; The positive power lens G8 is a plano-convex lens, and its image-facing surface is convex; The positive power lens G9 is a biconvex lens; The negative power lens G10 is a biconcave lens; The positive power lens G11 is a plano-convex lens, and its surface facing the object side is convex; The positive power lens G12 is a biconvex lens; The positive power lens G13 is a biconvex lens; The negative power lens G14 is a biconcave lens; The positive power lens G15 is a biconvex lens; The negative power lens G16 is a biconcave lens; The positive power lens G17 is a biconvex lens.

7. The lens according to claim 5, wherein: The positive power lens G12 and the positive power lens G15 are aspherical lenses.

8. The lens according to claim 5, wherein: The positive power lens G1 and the positive power lens G2 form a cemented lens group; The negative power lens G7 and the positive power lens G8 form a cemented lens group; The positive power lens G9 and the negative power lens G10 form a cemented lens group; The positive power lens G13 and the negative power lens G14 form a cemented lens group.

9. The lens according to claim 2 or 5, wherein: The clear aperture Φ1 of the positive power lens G1 and the total optical length TTL of the lens satisfy:

10. The lens according to claim 2 or 5, wherein: The relative displacement of the first mobile group is ΔZ and the total optical length TTL of the lens satisfies:

11. The lens according to claim 2 or 5, wherein: The relative displacement of the second mobile group is ΔF and the total optical length TTL of the lens satisfies:

12. The lens according to claim 2 or 5, wherein: The maximum aperture diameter Φ2 of the aperture stop, the focal length f of the lens in the short focus state w The focal length f of the lens in telephoto state t satisfy:

13. The lens according to claim 2 or 5, wherein: The refractive index V of each lens in the lens d Satisfy: 17.9≤V d ≤81.

6.

14. The lens according to claim 2 or 5, wherein: Abbe number N of each lens in the lens d Satisfies: 1.49≤N d ≤2.

0.

15. A camera device, characterized in that: The imaging device is provided with: a lens according to any one of claims 1 to 14 for imaging.

Images