Ultra-HD resolution zoom lens

Abstract

An ultra-high-definition resolution zoom lens comprises: a first positive focal length fixed lens group, a second negative focal length zoom movable lens group, an aperture stop, a third positive focal length auxiliary zoom movable lens group, a fourth negative focal length focusing movable lens group, a fifth positive focal length fixed lens and a filter, wherein: the filter is arranged between the fifth positive focal length fixed lens and the imaging surface. The present invention adopts a brand-new five-group optical structure and multi-motor linkage to break through various original limitations. Through the coordinated cooperation of multiple mobile groups and the matching of special optical materials, ultra-large magnification optical zoom and ultra-low distortion are satisfied in a very small space. Through the change of the stop structure, the diffraction limit at the telephoto end is improved, so that the lens can still meet the 4K ultra-high-definition resolution in 35X optical zoom.

Description

Technical Field

[0001] The present invention relates to a technology in the field of optical devices, specifically a zoom lens with a clarity reaching 4K resolution. Background Art

[0002] Existing security lenses cannot achieve true 4K resolution, i.e. 4096×2160 resolution, while meeting the requirements of large zoom ratios due to the diffraction limit at the telephoto end and the lens group structure. Currently, products with true 4K resolution are still in the small-magnification range. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention proposes an ultra-high-definition resolution zoom lens, which adopts a brand-new five-group optical structure and multi-motor linkage to break through the original limitations, and through the coordinated cooperation of multiple mobile groups and the combination of special optical materials, it meets the requirements of ultra-large-magnification optical zoom and ultra-low distortion in a very small space. By changing the aperture structure, the diffraction limit at the telephoto end is improved, so that the lens can still meet the 4K ultra-high-definition resolution in 35X optical zoom.

[0004] The present invention is achieved through the following technical solutions:

[0005] The present invention comprises: a first positive focal length fixed lens group, a second negative focal length zoom movable lens group, an aperture stop, a third positive focal length auxiliary zoom movable lens group, a fourth negative focal length focusing movable lens group, a fifth positive focal length fixed lens and a filter, which are arranged in sequence from the object side to the image side, wherein: the filter is arranged between the fifth positive focal length fixed lens and the imaging surface.

[0006] The first positive focal power fixed lens group comprises: a first negative focal power lens and a second positive focal power lens which are sequentially arranged and can be glued together to form a glued lens group, and a third positive focal power lens group.

[0007] The third positive power lens group is realized by positive power lenses and / or positive power cemented lenses.

[0008] The second negative power zoom movable lens group includes: a fourth negative power lens, a fifth negative power lens, a sixth positive power lens and a seventh negative power lens in sequence, wherein: the seventh negative power lens is arranged on the object side of the aperture stop.

[0009] The third positive power auxiliary zoom movable lens group comprises: an eighth positive power lens, a ninth positive power lens, a tenth negative power lens constituting a cemented part and an eleventh positive power lens arranged in sequence, wherein: the eighth positive power lens is arranged on the image side of the aperture stop.

[0010] The fourth negative focal power focusing movable lens group comprises: a twelfth negative focal power lens and a thirteenth positive focal power lens which are sequentially arranged to form a cemented member.

[0011] The fifth positive power fixed lens is a fourteenth positive power lens.

[0012] At least one of the second negative focal power zoom movable lens group and / or the third positive focal power auxiliary zoom movable lens group is an aspherical lens.

[0013] The ninth positive power lens further forms a three-lens cemented component with the tenth negative power lens and the eleventh positive power lens.

[0014] When the object distance changes, the position of the focusing lens group is adjusted along the optical axis, and the present invention realizes focusing at different magnifications; when the zoom lens group moves from the object side to the image side along the optical axis, the auxiliary zoom group performs coordinated movement to realize the magnification change process from the wide-angle end to the telephoto end.

[0015] Technical Effects

[0016] Compared with the prior art, the present invention has the following technical effects:

[0017] 1. 4K ultra-high-definition resolution can be used with image sensors with more than 12 million pixels, which can clearly capture the monitored objects and greatly improve the recognizability and authenticity of the monitored images.

[0018] 2. The whole infrared confocal can maintain clear and high-contrast imaging 24 hours a day under complex conditions such as various focal lengths and mixed reflections of multiple wavelengths, greatly expanding the scope of use.

[0019] 3. The ultra-large aperture meets the extremely small F number of F1.2 at the wide end under the condition of ultra-large magnification. The extremely large aperture enhances the low-light effect and enables clear imaging even in extremely dark conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of embodiment 1 of the present invention;

[0021] Figure 2 is a schematic diagram of embodiment 2 of the present invention;

[0022] Figure 3 is a schematic diagram of embodiment 3 of the present invention;

[0023] In the figure: a first negative power lens L1, a second positive power lens L2, a third positive power lens group G3, a fourth negative power lens L4, a fifth negative power lens L5, a sixth positive power lens L6, a seventh negative power lens L7, an eighth positive power lens L8, a ninth positive power lens L9, a tenth negative power lens L10, an eleventh positive power lens L11, a twelfth negative power lens L12, a thirteenth positive power lens L13, a fourteenth positive power lens L14, a filter 15, a first positive power fixed lens group GI, a second negative power zoom movable lens group GII, an aperture stop STP, a third positive power auxiliary zoom movable lens group GIII, a fourth negative power focusing movable lens group GIV, a fifth positive power fixed lens GV, and an imaging surface IMG. DETAILED DESCRIPTION

[0024] Example 1

[0025] like Figure 1 As shown, an ultra-high-definition resolution zoom lens involved in the present embodiment comprises: a first positive optical focal length fixed lens group GI, a second negative optical focal length zoom movable lens group GII, an aperture stop STP, a third positive optical focal length auxiliary zoom movable lens group GIII, a fourth negative optical focal length focusing movable lens group GIV, a fifth positive optical focal length fixed lens GV and a filter 15, which are arranged in sequence from the object side to the image side, wherein: the filter 15 is arranged between the fifth positive optical focal length fixed lens GV and the imaging surface 22.

[0026] The first positive power fixed lens group GI comprises: a first negative power lens L1 and a second positive power lens L2 which are sequentially arranged and can be cemented into a cemented lens group, and a third positive power lens group G3.

[0027] The third positive focal power lens group G3 is realized by a single positive lens or a cemented lens composed of two to three positive lenses.

[0028] The second negative optical focal length zoom movable lens group GII includes at least one thickened lens, and the thickness D of the thickened lens satisfies: D / TTL>0.05; wherein: TTL is the total optical length of the ultra-high-definition resolution zoom lens.

[0029] The second negative optical power zoom movable lens group GII includes in sequence: a fourth negative optical power lens L4, a fifth negative optical power lens L5 and a sixth positive optical power lens L6 which are cemented to form a sixth lens group, and a seventh negative optical power lens L7, wherein: the seventh negative optical power lens L7 is arranged on the object side of the aperture stop STP.

[0030] The third positive power auxiliary zoom movable lens group GIII includes: an eighth positive power lens L8, a ninth positive power lens L9, a tenth negative power lens L10 and an eleventh positive power lens L11 which are sequentially arranged, wherein: the eighth positive power lens L8 is arranged on the image side of the aperture stop STP.

[0031] The fourth negative power focusing movable lens group GIV comprises: a twelfth negative power lens L12 and a thirteenth positive power lens L13 which are sequentially arranged and constitute a cemented member.

[0032] The fifth positive-power fixed lens GV is realized by using a fourteenth positive-power lens L14.

[0033] At least one of the second negative power zoom movable lens group GII and the third positive power auxiliary zoom movable lens group GIII is an aspherical lens.

[0034] The seventh negative power lens L7, the eighth positive power lens L8 and the fourteenth positive power lens L14 are aspherical lenses.

[0035] The focal length of the lens of this embodiment is F=6-210 mm, the relative aperture FNO=1.28-4.8 mm, and the field of view FOV=70°-2°.

[0036] Table 1 Lens structure parameters of Example 1

[0037]

[0038]

[0039] In this embodiment, the seventh negative power lens L7, the eighth positive power lens L8 and the fourteenth positive power lens L14 are aspherical surfaces, wherein the aspherical lens coefficients are:

[0040] Where: Z is the sa value of the lens, c is the inverse of the radius of curvature, h is the height from the lens edge to the optical axis, k is the cone coefficient, and A, B, C, D and E represent high-order aspheric coefficients respectively.

[0041] Table 2 Aspheric coefficients of lens in Example 1

[0042] S13 S14 S16 S17 S25 S26 Quadratic surface constant (K) 0 0 -0.534459 -5.374796095 -1.027505 -4.51261868 4th order coefficient (A) 1.50E-06 -2.29E-05 -1.21E-05 6.87E-06 0.0001131 0.000139672 6th order coefficient (B) -3.34E-06 -2.87E-06 2.50E-08 4.54E-08 -1.10E-06 -3.05E-06 8th order coefficient (C) 5.67E-08 5.24E-08 -2.66E-11 -3.61E-10 2.95E-08 4.34E-08 10th order coefficient (D) -5.16E-10 -4.44E-10 -3.40E-13 1.52E-12 -3.33E-10 -3.80E-10

[0043] Example 2

[0044] like Figure 2As shown, compared with Example 1, the fifth negative power lens L5 and the sixth positive power lens L6 in this embodiment are independent lenses and the materials are recombined. Under the condition of ensuring fno, the magnification is shortened and the cost is reduced.

[0045] The overall focal length of the lens of this embodiment is F=6.6-200 mm, the relative aperture FNO=1.28-4.5 mm, and the field of view FOV=68°-2.4°.

[0046] Table 3 Lens structure parameters of Example 2

[0047]

[0048]

[0049] In this embodiment, the seventh negative power lens L7, the eighth positive power lens L8 and the fourteenth positive power lens L14 are aspherical surfaces, wherein the aspherical lens coefficients are:

[0050] Z is the sa value of the lens, c is the inverse of the radius of curvature, h is the height from the lens edge to the optical axis, k is the cone coefficient, and A, B, C, D and E represent high-order aspheric coefficients respectively.

[0051] Table 4 Aspheric coefficients of the lens in Example 2

[0052] S14 S15 S17 S18 S26 S27 Quadratic surface constant (K) 0 -1.0275047 0 -5.37479609 -0.534459 -4.5126187 4th order coefficient (A) 1.98E-06 0.00011314 1.50E-06 6.87E-06 -1.21E-05 0.00013967 6th order coefficient (B) -3.17E-06 -1.10E-06 -3.34E-06 4.54E-08 2.50E-08 -3.05E-06 8th order coefficient (C) 5.85E-08 2.95E-08 5.67E-08 -3.61E-10 -2.66E-11 4.34E-08 10th order coefficient (D) -5.83E-10 -3.33E-10 -5.16E-10 1.52E-12 -3.40E-13 -3.80E-10

[0053] Example 3

[0054] like Figure 3 As shown, compared with Example 1, this embodiment removes the high-dispersion molded aspherical lens in the fourteenth positive power lens L14 and replaces it with a spherical lens made of conventional materials. At the same time, the three cemented parts are replaced with an independent ninth positive power lens L9 and a cemented tenth negative power lens L10 and an eleventh positive power lens L11, which greatly reduces the cost and increases the FNO.

[0055] The numerical data are: focal length F=6.6-200mm, relative aperture FNO=1.6-4.8mm, field of view FOV=68°-2.4°.

[0056] Table 5 Lens structure parameters of this embodiment

[0057]

[0058]

[0059] In this embodiment, the seventh negative power lens L7 and the eighth positive power lens L8 are aspherical surfaces, wherein the aspherical lens coefficients are:

[0060] Where: Z is the sa value of the lens, c is the inverse of the radius of curvature, h is the height from the lens edge to the optical axis, k is the cone coefficient, and A, B, C, D and E represent high-order aspheric coefficients respectively.

[0061] Table 6 Aspheric coefficients of lens in Example 3

[0062] S13 S14 S16 S17 Quadratic surface constant (K) 0 0 -0.252689 -80 4th order coefficient (A) -6.47E-06 -2.20E-05 -8.08E-06 1.33E-05 6th order coefficient (B) -2.96E-06 -2.52E-06 1.97E-08 3.77E-08 8th order coefficient (C) 6.23E-08 5.71E-08 -2.83E-10 -4.77E-10 10th order coefficient (D) -6.78E-10 -6.07E-10 6.52E-13 1.94E-12

[0063] The present invention realizes high-magnification optical lossless zoom through group linkage and special material matching. Compared with the previous lenses of the same type, it has better clarity, larger aperture, lower cost, and greatly improved economic benefits.

[0064] The above-mentioned specific implementation can be partially adjusted in different ways by those skilled in the art without departing from the principle and purpose of the present invention. The protection scope of the present invention shall be based on the claims and shall not be limited by the above-mentioned specific implementation. Each implementation scheme within its scope shall be subject to the constraints of the present invention.

Claims

1. An ultra-high-definition resolution zoom lens, characterized in that: include: A first positive focal power fixed lens group, a second negative focal power zoom movable lens group, an aperture stop, a third positive focal power auxiliary zoom movable lens group, a fourth negative focal power focusing movable lens group, a fifth positive focal power fixed lens and a filter are sequentially arranged from the object side to the image side, wherein: the filter is arranged between the fifth positive focal power fixed lens and the imaging surface; The first positive focal power fixed lens group comprises: a first negative focal power lens and a second positive focal power lens which can be glued together to form a glued lens group, and a third positive focal power lens group; The second negative power zoom movable lens group includes: a fourth negative power lens, a fifth negative power lens, a sixth positive power lens and a seventh negative power lens in sequence, wherein: the seventh negative power lens is arranged on the object side of the aperture stop; The third positive power auxiliary zoom movable lens group comprises: an eighth positive power lens, a ninth positive power lens, a tenth negative power lens and an eleventh positive power lens which are sequentially arranged, wherein: the eighth positive power lens is arranged on the image side of the aperture stop; The fourth negative focal power focusing movable lens group comprises: a twelfth negative focal power lens and a thirteenth positive focal power lens which are arranged in sequence and constitute a cemented member; The third positive power lens group is realized by a positive lens or a cemented lens composed of two to three positive lenses; At least one of the second negative power zoom movable lens group and / or the third positive power auxiliary zoom movable lens group is an aspherical lens; The second negative optical focal length zoom movable lens group includes at least one thickened lens, and the thickness D of the thickened lens satisfies: D / TTL>0.05; wherein: TTL is the total optical length of the ultra-high-definition resolution zoom lens.

2. The ultra-high-definition resolution zoom lens according to claim 1, characterized in that: The fifth positive power fixed lens is a fourteenth positive power lens.

3. The ultra-high-definition resolution zoom lens according to claim 1, characterized in that: The fifth negative power lens and the sixth positive power lens form a cemented part.

4. The ultra-high-definition resolution zoom lens according to claim 1, characterized in that: The seventh negative power lens and the eighth positive power lens are aspherical lenses.

5. The ultra-high-definition resolution zoom lens according to claim 2, characterized in that: The seventh negative power lens, the eighth positive power lens and the fourteenth positive power lens are aspherical lenses.

6. The ultra-high-definition resolution zoom lens according to claim 1, characterized in that: The ninth positive power lens further forms a three-lens cemented component with the tenth negative power lens and the eleventh positive power lens.

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