An ultra-high-definition projection lens and an imaging device

Abstract

The application relates to the field of optics, in particular to an ultra-high-definition projection lens and an imaging device. The ultra-high-definition projection lens is composed of a focusing lens group with negative focal length, a first variable magnification lens group with positive focal length, a second variable magnification lens group with positive focal length, a third variable magnification lens group with positive focal length, a fourth variable magnification lens group with negative focal length, a zoom lens group with positive focal length and a fixed lens group with positive focal length from the object plane side to the image plane side. The zoom of the ultra-high-definition projection lens is realized through the arrangement of a large number of variable magnification lens groups and zoom lens groups, the difference in phase and the coma caused by the moving group in the ultra-high-definition projection lens are greatly reduced, the resolving power of the ultra-high-definition projection lens is increased, and through the limitation of the focal length and the total optical length of the ultra-high-definition projection lens, the brightness of the ultra-high-definition projection lens can be increased on the basis of realizing the miniaturization of the ultra-high-definition projection lens.

Description

Technical Field

[0001] This invention relates to the field of optics, specifically to an ultra-high-definition projection lens and imaging device. Background Technology

[0002] Projection lenses generally refer to replaceable engineering projection lenses used in professional projectors. Consumers typically categorize lenses based on their needs for projector installation distance and screen size: short-throw, medium-throw, long-throw, and lenses for specific application scenarios.

[0003] Currently, users have increasingly higher requirements for the resolution of projection lenses, and higher resolution requires higher lens resolution. However, how to form a high-resolution projection lens within a certain volume is the main research direction of projection lenses. Summary of the Invention

[0004] This invention addresses existing technical problems by providing an ultra-high-definition projection lens and imaging device. Through the arrangement of numerous zoom lens groups and zoom zoom lens groups, the ultra-high-definition projection lens achieves zoom capabilities and significantly reduces phase and coma caused by moving groups within the lens, thereby increasing its resolving power. Furthermore, by limiting the focal length and total optical length of the ultra-high-definition projection lens, it achieves miniaturization while also increasing its brightness.

[0005] The technical solution provided by this invention is as follows:

[0006] An ultra-high-definition projection lens, wherein the ultra-high-definition projection lens is composed of, from the object plane side to the image plane side, a focusing lens group with negative optical power, a first zoom lens group with positive optical power, a second zoom lens group with positive optical power, a third zoom lens group with positive optical power, a fourth zoom lens group with negative optical power, a zoom lens group with positive optical power, and a fixed lens group with positive optical power.

[0007] The first zoom lens group, the second zoom lens group, the third zoom lens group, the fourth zoom lens group, and the zoom lens group move along the main optical axis of the ultra-high-definition projection lens to adjust the focal length of the ultra-high-definition projection lens.

[0008] The focusing lens group moves along the main optical axis of the ultra-high-definition projection lens to adjust the object distance of the ultra-high-definition projection lens.

[0009] Both the first and third zoom lens groups are lenses with positive optical power;

[0010] The fourth zoom lens group is a lens with negative optical power;

[0011] The fixed lens group is a first fixed lens with positive optical power;

[0012] The ultra-high-definition projection lens contains at most one aspherical lens;

[0013] The ultra-high-definition projection lens satisfies the following condition:

[0014] fno < 2.2;

[0015] ft / fw < 2;

[0016] TTL / ft < 6;

[0017] Wherein, fno is the aperture number of the ultra-high-definition projection lens, ft is the focal length of the ultra-high-definition projection lens in telephoto mode, fw is the focal length of the ultra-high-definition projection lens in wide-angle mode, and TTL is the total optical length of the ultra-high-definition projection lens.

[0018] In this technical solution, the zoom capability of the ultra-high-definition projection lens is achieved by setting up a large number of zoom lens groups and zoom lens groups, and the phase aberration and coma caused by the moving groups in the ultra-high-definition projection lens are greatly reduced, thereby increasing the resolution of the ultra-high-definition projection lens. At the same time, by limiting the focal length and total optical length of the ultra-high-definition projection lens, the brightness of the ultra-high-definition projection lens can be increased to a certain extent while achieving miniaturization.

[0019] Preferably, the focusing lens group consists of a first focusing lens with negative optical power, a second focusing lens with negative optical power, and a third focusing lens with negative optical power, arranged sequentially from the object plane side to the image plane side.

[0020] Preferably, the second zoom lens group consists of a lens with positive optical power and a lens with negative optical power, sequentially from the object plane side to the image plane side.

[0021] Preferably, the zoom lens group consists of a second zoom lens with positive optical power, a third zoom lens with negative optical power, a fourth zoom lens with positive optical power, a fifth zoom lens with negative optical power, a sixth zoom lens with positive optical power, and a seventh zoom lens with positive optical power, from the object plane side to the image plane side. The third zoom lens and the fourth zoom lens are cemented together, and the fifth zoom lens and the sixth zoom lens are cemented together.

[0022] Preferably, the second zoom lens group is a single lens with positive optical power.

[0023] Preferably, the zoom lens group consists of a first zoom lens with positive optical power, a second zoom lens with negative optical power, a third zoom lens with negative optical power, a fourth zoom lens with positive optical power, a fifth zoom lens with negative optical power, a sixth zoom lens with positive optical power, and a seventh zoom lens with positive optical power, from the object plane side to the image plane side. The third zoom lens and the fourth zoom lens are cemented together, and the fifth zoom lens and the sixth zoom lens are cemented together.

[0024] Preferably, the ultra-high-definition projection lens satisfies the following condition:

[0025] XG4 / TTL > 0.25;

[0026] Wherein, XG4 is the moving distance of the third focusing lens group.

[0027] In this technical solution, by limiting the moving distance of the third zoom lens group, while achieving zoom of the ultra-high-definition projection lens, the degree of change in the optical path of the third zoom lens group during a certain process is reduced by increasing the moving distance of the third zoom lens group. Furthermore, the phase aberration and coma caused by the movement of the third zoom lens group are reduced by the remaining zoom lens groups, thereby increasing the resolution of the ultra-high-definition projection lens.

[0028] Preferably, the ultra-high-definition projection lens satisfies the following condition:

[0029] 0.4 < XG6 / XG4 < 0.5;

[0030] Wherein, XG6 is the moving distance of the zoom lens group.

[0031] In this technical solution, by limiting the moving distance of the zoom lens group, the impact of the excessively long volume of the zoom lens group on the ultra-high-definition projection lens is reduced, thereby achieving the miniaturization of the ultra-high-definition projection lens.

[0032] Preferably, the ultra-high-definition projection lens satisfies the following condition:

[0033] XG2 / XG4 < 0.3;

[0034] 0.15 < XG3 / XG4 < 0.2;

[0035] Wherein, XG2 is the moving distance of the first zoom lens group, and XG4 is the moving distance of the third zoom lens group.

[0036] In this technical solution, the phase aberration and coma of the ultra-high-definition projection lens are greatly reduced by the small moving distance of the first and third zoom lens groups, thereby increasing the resolution of the ultra-high-definition projection lens.

[0037] Preferably, the ultra-high-definition projection lens satisfies the following condition:

[0038] 0.15 < SG7I / TTL < 0.2;

[0039] SG7I is the distance between the fixed lens group and the image plane.

[0040] In this technical solution, by limiting the distance between the fixed lens group and the image plane, the angle between the light path and the principal optical axis when projected onto the image plane is reduced, light dissipation is reduced, and the brightness of the ultra-high-definition projection lens is increased.

[0041] Preferably, the ultra-high-definition projection lens satisfies the following condition:

[0042] DG26m / TTL > 0.45;

[0043] DG26m is the minimum total optical length from the first zoom lens group to the zoom lens group.

[0044] In this technical solution, by limiting the minimum total optical length from the first zoom lens group to the zoom lens group, the length of the moving group within the ultra-high-definition projection lens is increased, further enhancing the resolution of the ultra-high-definition projection lens.

[0045] One of the objectives of this invention is to provide an imaging device, comprising: an ultra-high-definition projection lens; and an imaging element configured to receive an image formed by the ultra-high-definition projection lens.

[0046] Compared with the prior art, the ultra-high-definition projection lens and imaging device provided by the present invention have the following beneficial effects:

[0047] 1. By setting up a large number of zoom lens groups and zoom lens groups, the zoom of the ultra-high-definition projection lens is realized, and the phase aberration and coma caused by the moving groups in the ultra-high-definition projection lens are greatly reduced, thereby increasing the resolution of the ultra-high-definition projection lens. At the same time, by limiting the focal length and total optical length of the ultra-high-definition projection lens, the brightness of the ultra-high-definition projection lens can be increased to a certain extent while realizing the miniaturization of the ultra-high-definition projection lens.

[0048] 2. By using the small moving distance of the first and third zoom lens groups, the phase aberration and coma of the ultra-high-definition projection lens are greatly reduced, thereby increasing the resolution of the ultra-high-definition projection lens.

[0049] 3. By limiting the minimum total optical length from the first zoom lens group to the zoom lens group, the length of the moving group within the ultra-high-definition projection lens is increased, further enhancing the resolution of the ultra-high-definition projection lens. Attached Figure Description

[0050] The preferred embodiments will now be described in a clear and easy-to-understand manner, with reference to the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of an ultra-high-definition projection lens and imaging device.

[0051] Figure 1 This is a schematic diagram of the structure of an ultra-high-definition projection lens according to the present invention;

[0052] Figure 2 This is an aberration diagram of an ultra-high-definition projection lens in telephoto mode according to the present invention;

[0053] Figure 3 This invention provides a coma diagram of an ultra-high-definition projection lens in telephoto mode.

[0054] Figure 4 This is an aberration diagram of a wide-angle state of an ultra-high-definition projection lens according to the present invention;

[0055] Figure 5 This invention relates to a coma diagram of a wide-angle ultra-high-definition projection lens.

[0056] Figure 6 This is a schematic diagram of another ultra-high-definition projection lens of the present invention;

[0057] Figure 7 This is another aberration diagram of the telephoto state of the ultra-high-definition projection lens of the present invention;

[0058] Figure 8 This is another coma diagram of the ultra-high-definition projection lens in telescopic state according to the present invention;

[0059] Figure 9 This is another aberration diagram of the ultra-high-definition projection lens in the wide-angle state according to the present invention;

[0060] Figure 10 This is another coma diagram of the ultra-high-definition projection lens in a wide-angle state according to the present invention.

[0061] Explanation of reference numerals: G1, Focusing lens group; G2, First zoom lens group; G3, Second zoom lens group; G4, Third zoom lens group; G5, Fourth zoom lens group; G6, Zoom lens group; G7, Fixed lens group; G8, Auxiliary components; a1, First focusing lens; a2, Second focusing lens; a3, Third focusing lens; b1, First zoom lens; b2, Second zoom lens; b3, Third zoom lens; b4, Fourth zoom lens; b5, Fifth zoom lens; c1, First zoom lens; c2, Second zoom lens; c3, Third zoom lens; c4, Fourth zoom lens; c5, Fifth zoom lens; c6, Sixth zoom lens; c7, Seventh zoom lens; d1, First fixed lens; STO, Aperture stop; CG, Protective glass. Detailed Implementation

[0062] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0063] To keep the drawings concise, each figure only schematically shows the parts relevant to the invention, and these do not represent the actual structure of the product. Furthermore, to facilitate understanding, in some figures, only one of components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0064] Example 1

[0065] like Figure 1 and Figure 6 As shown, an ultra-high-definition projection lens is composed of, from the object plane side to the image plane side, a focusing lens group G1 with negative optical power, a first zoom lens group G2 with positive optical power, a second zoom lens group G3 with positive optical power, a third zoom lens group G4 with positive optical power, a fourth zoom lens group G5 with negative optical power, a zoom lens group G6 with positive optical power, and a fixed lens group G7 with positive optical power.

[0066] The first zoom lens group G2, the second zoom lens group G3, the third zoom lens group G4, the fourth zoom lens group G5, and the zoom lens group G6 move along the main optical axis of the ultra-high-definition projection lens to adjust the focal length of the ultra-high-definition projection lens.

[0067] The focusing lens group G1 moves along the main optical axis of the ultra-high-definition projection lens to adjust the object distance of the ultra-high-definition projection lens.

[0068] Both the first zoom lens group G2 and the third zoom lens group G4 are lenses with positive optical power;

[0069] The fourth zoom lens group G5 is a lens with negative optical power;

[0070] The fixed lens group G7 is a first fixed lens d1 with positive optical power;

[0071] The ultra-high-definition projection lens contains at most one aspherical lens;

[0072] The ultra-high-definition projection lens satisfies the following condition:

[0073] fno < 2.2;

[0074] ft / fw < 2;

[0075] TTL / ft < 6;

[0076] Wherein, fno is the aperture number of the ultra-high-definition projection lens, ft is the focal length of the ultra-high-definition projection lens in telephoto mode, fw is the focal length of the ultra-high-definition projection lens in wide-angle mode, and TTL is the total optical length of the ultra-high-definition projection lens.

[0077] In this embodiment, by setting up a large number of zoom lens groups and zoom lens group G6, the zoom of the ultra-high-definition projection lens is realized, and the phase aberration and coma caused by the moving groups in the ultra-high-definition projection lens are greatly reduced, thereby increasing the resolution of the ultra-high-definition projection lens. At the same time, by limiting the focal length and total optical length of the ultra-high-definition projection lens, the brightness of the ultra-high-definition projection lens can be increased to a certain extent while realizing the miniaturization of the ultra-high-definition projection lens.

[0078] The focusing lens group G1 consists of a first focusing lens a1 with negative optical power, a second focusing lens a2 with negative optical power, and a third focusing lens a3 with negative optical power, arranged sequentially from the object plane side to the image plane side.

[0079] The second zoom lens group G3 consists of a lens with positive optical power and a lens with negative optical power, arranged sequentially from the object plane side to the image plane side.

[0080] The zoom lens group G6 consists of a second zoom lens c2 with positive optical power, a third zoom lens c3 with negative optical power, a fourth zoom lens c4 with positive optical power, a fifth zoom lens c5 with negative optical power, a sixth zoom lens c6 with positive optical power, and a seventh zoom lens c7 with positive optical power, from the object plane side to the image plane side. The third zoom lens c3 and the fourth zoom lens c4 are cemented together, and the fifth focusing lens c5 and the sixth focusing lens c6 are cemented together.

[0081] or

[0082] The second zoom lens group G3 is a lens with positive optical power.

[0083] The zoom lens group G6 consists of, from the object plane side to the image plane side, a first zoom lens c1 with positive optical power, a second zoom lens c2 with negative optical power, a third zoom lens c3 with negative optical power, a fourth zoom lens c4 with positive optical power, a fifth zoom lens c5 with negative optical power, a sixth zoom lens c6 with positive optical power, and a seventh zoom lens c7 with positive optical power. The third zoom lens c3 and the fourth zoom lens c4 are cemented together, and the fifth zoom lens c5 and the sixth zoom lens c6 are cemented together.

[0084] The ultra-high-definition projection lens satisfies the following condition:

[0085] XG4 / TTL > 0.25;

[0086] Wherein, XG4 is the moving distance of the third zoom lens group G4.

[0087] By limiting the moving distance of the third zoom lens group G4, while achieving zoom of the ultra-high-definition projection lens, the degree of change in the optical path of the third zoom lens group G4 during a certain process is reduced by increasing the moving distance of the third zoom lens group G4. Furthermore, the phase aberration and coma caused by the movement of the third zoom lens group G4 are reduced by the remaining zoom lens group, thereby increasing the resolution of the ultra-high-definition projection lens.

[0088] The ultra-high-definition projection lens satisfies the following condition:

[0089] 0.4 < XG6 / XG4 < 0.5;

[0090] Wherein, XG6 is the moving distance of the zoom lens group G6.

[0091] By limiting the moving distance of the zoom lens group G6, the impact of the excessively long size of the zoom lens group G6 on the ultra-high-definition projection lens is reduced, thus achieving miniaturization of the ultra-high-definition projection lens.

[0092] The ultra-high-definition projection lens satisfies the following condition:

[0093] XG2 / XG4 < 0.3;

[0094] 0.15 < XG3 / XG4 < 0.2;

[0095] Wherein, XG2 is the moving distance of the first zoom lens group G2, and XG4 is the moving distance of the third zoom lens group G4.

[0096] By using a small moving distance between the first zoom lens group G2 and the third zoom lens group G4, the phase aberration and coma of the ultra-high-definition projection lens are greatly reduced, thereby increasing the resolution of the ultra-high-definition projection lens.

[0097] The ultra-high-definition projection lens satisfies the following condition:

[0098] 0.15 < SG7I / TTL < 0.2;

[0099] SG7I is the distance between the fixed lens group G7 and the image plane.

[0100] By limiting the distance between the fixed lens group G7 and the image plane, the angle between the light path and the principal optical axis when projected onto the image plane is reduced, light dissipation is reduced, and the brightness of the ultra-high-definition projection lens is increased.

[0101] The ultra-high-definition projection lens satisfies the following condition:

[0102] DG26m / TTL > 0.45;

[0103] DG26m is the minimum total optical length of the first zoom lens group G2 to zoom lens group G6.

[0104] By limiting the minimum total optical length of the first zoom lens group G2 to the zoom lens group G6, the length of the moving group within the ultra-high-definition projection lens is increased, further enhancing the resolution of the ultra-high-definition projection lens.

[0105] Example 2

[0106] like Figures 1 to 5 As shown, an ultra-high-definition projection lens is composed of, from the object plane side to the image plane side, a focusing lens group G1 with negative optical power, a first zoom lens group G2 with positive optical power, a second zoom lens group G3 with positive optical power, a third zoom lens group G4 with positive optical power, a fourth zoom lens group G5 with negative optical power, a zoom lens group G6 with positive optical power, a fixed lens group G7 with positive optical power, and an auxiliary component G8.

[0107] The focusing lens group G1 consists of a first focusing lens a1 with negative optical power, a second focusing lens a2 with negative optical power, and a third focusing lens a3 with negative optical power, arranged sequentially from the object plane side to the image plane side.

[0108] The first zoom lens group G2 is a positive optical power first zoom lens b1.

[0109] The second zoom lens b2 consists of a positive optical power second zoom lens b2 and a negative optical power third zoom lens b3, arranged sequentially from the object plane side to the image plane side.

[0110] The third zoom lens group G4 is a fourth zoom lens b4 with positive optical power.

[0111] The fourth zoom lens group G5 is a fifth zoom lens b5 with negative optical power.

[0112] The zoom lens group G6 consists of a second zoom lens c2 with positive optical power, a third zoom lens c3 with negative optical power, a fourth zoom lens c4 with positive optical power, a fifth zoom lens c5 with negative optical power, a sixth zoom lens with positive optical power, and a seventh zoom lens with positive optical power, arranged sequentially from the object plane side to the image plane side. The third zoom lens c3 and the fourth zoom lens c4 are cemented together, and the fifth zoom lens c5 and the sixth zoom lens c6 are cemented together.

[0113] The fixed lens group G7 is a first fixed lens d1 with positive optical power;

[0114] The auxiliary component G8 is a protective glass CG.

[0115] The basic lens data of the ultra-high-definition projection lens in this embodiment is shown in Table 1, the variable parameters in Table 1 are shown in Tables 2 and 3, and the aspherical coefficients are shown in Table 4.

[0116] The surface number column shows the surface number when the object-side surface is set as surface 1 and the numbering is increased sequentially towards the image side; the surface type column shows the surface type of a lens; the radius of curvature column shows the radius of curvature of a lens, where a positive radius of curvature indicates that the surface is curved towards the object side and a negative radius of curvature indicates that the surface is curved towards the image side; the center thickness column shows the surface spacing on the optical axis between each surface and the surface adjacent to it on the image side; the refractive index column shows the refractive index of a lens; and the Abbe number column shows the Abbe number of a lens.

[0117] In Table 2, the WIDE column indicates the specific values ​​of each variable parameter when the ultra-high-definition projection lens is in the wide-angle position, and the TELE column indicates the specific values ​​of each variable parameter when the ultra-high-definition projection lens is in the telephoto position.

[0118] Table 3 shows the specific values ​​of each variable parameter of the ultra-high-definition projection lens in the wide-angle state at different object distances.

[0119] In Table 4, K is the conic coefficient, and e is the scientific notation, for example, e-05 represents 10. -5 .

[0120] Table 1

[0121]

[0122]

[0123] Table 2

[0124] D1 16.83 4.39 D2 2.43 4.41 D3 42.73 0.5 D4 2.14 42.04 D5 14.74 3.9 D6 0.5 24.13

[0125] Table 3

[0126]

[0127]

[0128] Table 4

[0129]

[0130] In this embodiment, fw = 21mm, ft = 39.48mm, fno = 1.57-1.94, TTL = 205mm; ft / fw = 1.88, TTL / ft = 5.19;

[0131] Wherein, fno is the aperture number of the ultra-high-definition projection lens, ft is the focal length of the ultra-high-definition projection lens in telephoto mode, fw is the focal length of the ultra-high-definition projection lens in wide-angle mode, and TTL is the total optical length of the ultra-high-definition projection lens.

[0132] XG4=52.7mm, XG4 / TTL=0.257;

[0133] Wherein, XG4 is the moving distance of the third zoom lens group G4.

[0134] XG6=23.6mm, XG6 / XG4=0.448;

[0135] Wherein, XG6 is the moving distance of the zoom lens group G6.

[0136] XG2=12.4mm, XG3=10.5mm, XG2 / XG4=0.235, XG3 / XG4=0.199;

[0137] Wherein, XG2 is the moving distance of the first zoom lens group G2, and XG4 is the moving distance of the third zoom lens group G4.

[0138] SG7I=39.91mm, SG7I / TTL=0.195;

[0139] SG7I is the distance between the fixed lens group G7 and the image plane.

[0140] DG26=98.54mm, DG26m / TTL=0.48;

[0141] DG26m is the minimum total optical length of the first zoom lens group G2 to zoom lens group G6.

[0142] Example 3

[0143] like Figures 6 to 10 As shown, an ultra-high-definition projection lens is composed of, from the object plane side to the image plane side, a focusing lens group G1 with negative optical power, a first zoom lens group G2 with positive optical power, a second zoom lens group G3 with positive optical power, a third zoom lens group G4 with positive optical power, a fourth zoom lens group G5 with negative optical power, a zoom lens group G6 with positive optical power, a fixed lens group G7 with positive optical power, and an auxiliary component G8.

[0144] The focusing lens group G1 consists of a first focusing lens a1 with negative optical power, a second focusing lens a2 with negative optical power, and a third focusing lens a3 with negative optical power, arranged sequentially from the object plane side to the image plane side.

[0145] The first zoom lens group G2 is a positive optical power first zoom lens b1.

[0146] The second zoom lens b2 consists of a positive optical power second zoom lens b2 and a negative optical power third zoom lens b3, arranged sequentially from the object plane side to the image plane side.

[0147] The third zoom lens group G4 is a fourth zoom lens b4 with positive optical power.

[0148] The fourth zoom lens group G5 is a fifth zoom lens b5 with negative optical power.

[0149] The zoom lens group G6 consists of a second zoom lens c2 with positive optical power, a third zoom lens c3 with negative optical power, a fourth zoom lens c4 with positive optical power, a fifth zoom lens c5 with negative optical power, a sixth zoom lens c6 with positive optical power, and a seventh zoom lens c7 with positive optical power, arranged sequentially from the object plane side to the image plane side. The third zoom lens c3 and the fourth zoom lens c4 are cemented together, and the fifth zoom lens c5 and the sixth zoom lens c6 are cemented together.

[0150] The fixed lens group G7 is a first fixed lens d1 with positive optical power;

[0151] The auxiliary component G8 is a protective glass CG.

[0152] The basic lens data of the ultra-high-definition projection lens in this embodiment is shown in Table 5, the variable parameters in Table 5 are shown in Tables 6 and 7, and the aspherical coefficients are shown in Table 8.

[0153] The surface number column shows the surface number when the object-side surface is set as surface 1 and the numbering is increased sequentially towards the image side; the surface type column shows the surface type of a lens; the radius of curvature column shows the radius of curvature of a lens, where a positive radius of curvature indicates that the surface is curved towards the object side and a negative radius of curvature indicates that the surface is curved towards the image side; the center thickness column shows the surface spacing on the optical axis between each surface and the surface adjacent to it on the image side; the refractive index column shows the refractive index of a lens; and the Abbe number column shows the Abbe number of a lens.

[0154] In Table 6, the WIDE column indicates the specific values ​​of each variable parameter when the ultra-high-definition projection lens is in the wide-angle end state, and the TELE column indicates the specific values ​​of each variable parameter when the ultra-high-definition projection lens is in the telephoto end state.

[0155] Table 7 shows the specific values ​​of each variable parameter of the ultra-high-definition projection lens in the wide-angle state at different object distances.

[0156] In Table 8, K is the conic coefficient, and e is the scientific notation, for example, e-05 represents 10.-5 .

[0157] Table 5

[0158]

[0159]

[0160] Table 6

[0161] D1 10.09 4.96 D2 9.19 1.79 D3 56.3 0.8 D4 3.67 54.8 D5 11.88 0.5 D6 0.5 28.78

[0162] Table 7

[0163] D1 10.09 10.14 10.02 D2 9.19 9.19 9.19 D3 56.3 56.3 56.3 D4 3.67 3.67 3.67 D5 11.88 11.88 11.88 D6 0.5 0.5 0.5

[0164] Table 8

[0165]

[0166]

[0167] In this embodiment, fw = 21.16 mm, ft = 41.48 mm, fno = 1.63-2.06, TTL = 228.01 mm; ft / fw = 1.96, TTL / ft = 5.49;

[0168] Wherein, fno is the aperture number of the ultra-high-definition projection lens, ft is the focal length of the ultra-high-definition projection lens in telephoto mode, fw is the focal length of the ultra-high-definition projection lens in wide-angle mode, and TTL is the total optical length of the ultra-high-definition projection lens.

[0169] XG4=68mm, XG4 / TTL=0.298;

[0170] Wherein, XG4 is the moving distance of the third zoom lens group G4.

[0171] XG6=28.3mm, XG6 / XG4=0.416;

[0172] Wherein, XG6 is the moving distance of the zoom lens group G6.

[0173] XG2=5.1mm, XG3=12.5mm, XG2 / XG4=0.075, XG3 / XG4=0.184;

[0174] Wherein, XG2 is the moving distance of the first zoom lens group G2, and XG4 is the moving distance of the third zoom lens group G4.

[0175] SG7I=39.51mm, SG7I / TTL=0.173;

[0176] SG7I is the distance between the fixed lens group G7 and the image plane.

[0177] DG26=110.82mm, DG26m / TTL=0.486;

[0178] DG26m is the minimum total optical length of the first zoom lens group G2 to zoom lens group G6.

[0179] Example 4

[0180] An imaging device, such as Figures 1 to 10 As shown, it includes: an ultra-high-definition projection lens as described in any of the above embodiments, and an imaging element configured to receive an image formed by the ultra-high-definition projection lens.

[0181] It should be noted that the above embodiments can be freely combined as needed. The above description is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An ultra-high-definition projection lens, characterized in that, The ultra-high-definition projection lens consists of, from the object plane side to the image plane side, a focusing lens group with negative optical power, a first zoom lens group with positive optical power, a second zoom lens group with positive optical power, a third zoom lens group with positive optical power, a fourth zoom lens group with negative optical power, a zoom lens group with positive optical power, and a fixed lens group with positive optical power. The first zoom lens group, the second zoom lens group, the third zoom lens group, the fourth zoom lens group, and the zoom lens group move along the main optical axis of the ultra-high-definition projection lens to adjust the focal length of the ultra-high-definition projection lens. The focusing lens group moves along the main optical axis of the ultra-high-definition projection lens to adjust the object distance of the ultra-high-definition projection lens. Both the first and third zoom lens groups are lenses with positive optical power; The fourth zoom lens group is a lens with negative optical power; The fixed lens group is a first fixed lens with positive optical power; The ultra-high-definition projection lens contains at most one aspherical lens; The ultra-high-definition projection lens satisfies the following condition: 1.57≤fno≤2.06; 1.88≤ft / fw≤1.96; 5.19≤TTL / ft≤5.49; Wherein, fno is the aperture number of the ultra-high-definition projection lens, ft is the focal length of the ultra-high-definition projection lens in telephoto mode, fw is the focal length of the ultra-high-definition projection lens in wide-angle mode, and TTL is the total optical length of the ultra-high-definition projection lens.

2. The ultra-high-definition projection lens according to claim 1, characterized in that: The focusing lens group consists of a first focusing lens with negative optical power, a second focusing lens with negative optical power, and a third focusing lens with negative optical power, arranged sequentially from the object plane side to the image plane side.

3. The ultra-high-definition projection lens according to claim 1, characterized in that: The second zoom lens group consists of a positive optical power lens and a negative optical power lens, sequentially from the object plane side to the image plane side.

4. The ultra-high-definition projection lens according to claim 3, characterized in that: The zoom lens group consists of a second zoom lens with positive optical power, a third zoom lens with negative optical power, a fourth zoom lens with positive optical power, a fifth zoom lens with negative optical power, a sixth zoom lens with positive optical power, and a seventh zoom lens with positive optical power, arranged sequentially from the object plane side to the image plane side. The third and fourth zoom lenses are cemented together, and the fifth and sixth zoom lenses are cemented together.

5. The ultra-high-definition projection lens according to claim 1, characterized in that: The second zoom lens group is a single lens with positive optical power.

6. The ultra-high-definition projection lens according to claim 5, characterized in that: The zoom lens group consists of a first zoom lens with positive optical power, a second zoom lens with negative optical power, a third zoom lens with negative optical power, a fourth zoom lens with positive optical power, a fifth zoom lens with negative optical power, a sixth zoom lens with positive optical power, and a seventh zoom lens with positive optical power, arranged sequentially from the object plane side to the image plane side. The third zoom lens and the fourth zoom lens are cemented together, and the fifth zoom lens and the sixth zoom lens are cemented together.

7. The ultra-high-definition projection lens according to claim 1, characterized in that: The ultra-high-definition projection lens satisfies the following condition: XG4 / TTL > 0.25; Wherein, XG4 is the moving distance of the third zoom lens group.

8. The ultra-high-definition projection lens according to claim 7, characterized in that: The ultra-high-definition projection lens satisfies the following condition: 0.4 < XG6 / XG4 < 0.5; Wherein, XG6 is the moving distance of the zoom lens group.

9. The ultra-high-definition projection lens according to claim 7, characterized in that: The ultra-high-definition projection lens satisfies the following condition: XG2 / XG4 < 0.3; 0.15 < XG3 / XG4 < 0.2; Wherein, XG2 is the moving distance of the first zoom lens group, XG3 is the moving distance of the second zoom lens group, and XG4 is the moving distance of the third zoom lens group.

10. The ultra-high-definition projection lens according to claim 1, characterized in that: The ultra-high-definition projection lens satisfies the following condition: 0.15 < SG7I / TTL < 0.2; SG7I is the distance between the fixed lens group and the image plane.

11. The ultra-high-definition projection lens according to claim 1, characterized in that: The ultra-high-definition projection lens satisfies the following condition: DG26m / TTL > 0.45; DG26m is the minimum total optical length from the first zoom lens group to the zoom lens group.

12. An imaging device, characterized in that, include: The ultra-high-definition projection lens as described in any one of claims 1 to 11; An imaging element is configured to receive an image formed by the ultra-high-definition projection lens.

Images