Zoom optical projection lens and projector

Abstract

The invention discloses a zoom optical projection lens and a projector, and relates to the technical field of optical systems.The zoom optical projection lens comprises a first lens to an eleventh lens which are sequentially arranged from the image side to the object side; the first lens forms a first focusing group, the second lens and the third lens form a second focusing group, and the first focusing group and the second focusing group are movably arranged along the optical axis direction and are used for focusing; the fourth lens forms a first zoom group, the fifth lens forms a second zoom group, the sixth to tenth lenses form a third zoom group, and the first to third zoom groups are movably arranged along the optical axis direction for zooming; the eleventh lens forms a fixed group; the focal power of the fourth lens, the sixth lens, the seventh lens, the eighth lens, the tenth lens and the eleventh lens is positive; the focal power of the first lens, the second lens, the third lens, the fifth lens and the ninth lens is negative. The optical total length of the zoom optical projection lens is TTL, TTL is less than or equal to 170mm, and the definition of the zoom optical projection lens is greater than or equal to 1080P.

Description

Technical Field

[0001] This invention relates to the field of optical system technology, and in particular to a zoom optical projection lens and a projector. Background Technology

[0002] Current zoom lens technology commonly employs a multi-group, separate design architecture, typically with more than 15 lens elements. This results in bulky and heavy lenses, driving up material and manufacturing costs. Simultaneously, stringent assembly tolerances reduce production yield. While existing improvements (such as aspherical lenses or special coatings) have partially enhanced performance, they have failed to fundamentally reduce the number of lens elements, leading to core drawbacks such as poor portability and low cost-effectiveness. Summary of the Invention

[0003] The main objective of this invention is to provide a zoom optical projection lens and a projector, aiming to offer a zoom optical projection lens that is small in size and has high resolution.

[0004] To achieve the above objectives, the present invention proposes a zoom optical projection lens, which has an object side and an image side arranged opposite each other along the optical axis. The zoom optical projection lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, and an eleventh lens arranged sequentially from the image side to the object side. The first lens forms a first focusing group, and the second and third lenses form a second focusing group. The first and second focusing groups are movably arranged along the optical axis for focusing. The fourth lens forms a first zoom group, the fifth lens forms a second zoom group, and the sixth lens forms a third zoom group. The first, second, fifth, and tenth lenses constitute a third zoom group, and the first, second, and third zoom groups are movably arranged along the optical axis for zooming. The eleventh lens constitutes a fixed group. The optical power of the fourth, sixth, seventh, eighth, tenth, and eleventh lenses is positive, while the optical power of the first, second, third, fifth, and ninth lenses is negative. The total optical length of the zoom optical projection lens is TTL, TTL≤170mm, and the resolution of the zoom optical projection lens is greater than or equal to 1080P.

[0005] In one embodiment, the zoom optical projection lens further includes an aperture stop, which is disposed between the fifth lens and the sixth lens. The distance from the aperture stop to the first lens is BFL, satisfying 0.05≤BFL / TTL≤1.

[0006] In one embodiment, the diameter of the first lens is D1, where D1 ≤ 90 mm; the image plane diameter of the zoom optical projection lens is IC, where IC ≤ 28 mm; and the aperture value of the zoom optical projection lens is F, where 2.2 ≤ F ≤ 2.8 m.

[0007] In one embodiment, the focal length f of the zoom optical projection lens in wide-angle mode is F1 for the first focusing group, F2 for the second focusing group, F3 for the first zoom group, F4 for the second zoom group, F5 for the third zoom group, and F6 for the fixed group, while simultaneously satisfying:

[0008] -160≤F1≤-30,-11.31≤F1 / f≤2.12; -50≤F2≤0,-3.54≤F2 / f≤0; 20≤F3≤80, 1.41≤F3 / f≤5.66; 10≤F4≤60, 0.70≤F4 / f≤4.24; 300≤F5≤400, 21.19≤F5 / f≤28.27; 10≤F6≤60, 0.70≤F6 / f≤4.24.

[0009] In one implementation, The focal length of the first lens is f1, -160mm≤f1≤-30mm; The focal length of the second lens is f2, -60mm≤f2≤-10mm; The focal length of the third lens is f3, -60mm≤f3≤-10mm; The focal length of the fourth lens is f4, where 20mm ≤ f4 ≤ 80mm; The focal length of the fifth lens is f5, where 10mm ≤ f5 ≤ 60mm; The focal length of the sixth lens is f6, -60mm≤f6≤-10mm; The focal length of the seventh lens is f7, 10mm≤f7≤60mm; The focal length of the eighth lens is f8, where 10mm ≤ f8 ≤ 60mm; The focal length of the ninth lens is f9, -60mm≤f9≤-10mm; The focal length of the tenth lens is f10, where 10mm ≤ f10 ≤ 60mm; The focal length of the eleventh lens is f11, where 10mm ≤ f11 ≤ 60mm.

[0010] In one embodiment, the first lens is configured as a plastic aspherical lens; the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, and the eleventh lens are all configured as glass spherical lenses.

[0011] In one embodiment, the sixth lens and the seventh lens are cemented together; the eighth lens and the ninth lens are cemented together.

[0012] In one embodiment, the Abbe number of the first lens is V1, where 50.0 ≤ V1 ≤ 60.0; The Abbe number of the second lens is V2, where 30.0 ≤ V2 ≤ 60.0; The Abbe number of the third lens is V3, where 50.0 ≤ V3 ≤ 90.0; The Abbe number of the fourth lens is V4, where 20.0 ≤ V4 ≤ 40.0; The Abbe number of the fifth lens is V5, where 20.0 ≤ V5 ≤ 50.0; The Abbe number of the sixth lens is V6, where 20.0 ≤ V6 ≤ 40.0; The Abbe number of the seventh lens is V7, where 60.0 ≤ V7 ≤ 90.0; The Abbe number of the eighth lens is V8, where 60.0 ≤ V8 ≤ 90.0; The Abbe number of the ninth lens is V9, where 20.0 ≤ V9 ≤ 50.0; The Abbe number of the tenth lens is V10, where 60.0 ≤ V10 ≤ 90.0; The Abbe number of the eleventh lens is V11, where 10.0 ≤ V11 ≤ 40.0.

[0013] In one embodiment, the refractive index of the first lens is N1, where 1.40 ≤ N1 ≤ 1.60; The refractive index of the second lens is N2, 1.60≤N2≤1.90; The refractive index of the third lens is N3, where 1.40 ≤ N3 ≤ 1.60; The refractive index of the fourth lens is N4, where 1.60 ≤ N4 ≤ 1.90; The refractive index of the fifth lens is N5, where 1.60 ≤ N5 ≤ 1.90; The refractive index of the sixth lens is N6, where 1.70 ≤ N6 ≤ 1.90; The refractive index of the seventh lens is N7, where 1.40 ≤ N7 ≤ 1.60; The refractive index of the eighth lens is N8, where 1.40 ≤ N8 ≤ 1.60; The refractive index of the ninth lens is N9, where 1.70 ≤ N9 ≤ 1.95; The refractive index of the tenth lens is N10, where 1.40 ≤ N10 ≤ 1.60; The refractive index of the eleventh lens is N11, where 1.80 ≤ N11 ≤ 2.00.

[0014] The present invention also proposes a projector, the projector including a zoom optical projection lens, the zoom optical projection lens having an object side and an image side arranged opposite each other along the optical axis, the zoom optical projection lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, and an eleventh lens arranged sequentially from the image side to the object side; the first lens constitutes a first focusing group, the second lens and the third lens constitute a second focusing group, the first focusing group and the second focusing group are movably arranged along the optical axis for focusing; the fourth lens constitutes a first zoom group, the fifth lens constitutes a second zoom group, the first... The sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens constitute a third zoom group. The first zoom group, the second zoom group, and the third zoom group are movably arranged along the optical axis for zooming. The eleventh lens constitutes a fixed group. The optical power of the fourth lens, the sixth lens, the seventh lens, the eighth lens, the tenth lens, and the eleventh lens is positive. The optical power of the first lens, the second lens, the third lens, the fifth lens, and the ninth lens is negative. The total optical length of the zoom optical projection lens is TTL, TTL≤170mm, and the resolution of the zoom optical projection lens is greater than or equal to 1080P.

[0015] The technical solution of this invention achieves zoom and focus by arranging and moving 11 lenses and combining positive and negative optical powers, ensuring image resolution while simplifying the mechanical structure, so that the zoom optical projection lens can simultaneously meet the requirements of small size and high definition. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of an embodiment of the optical projection system provided by the present invention; Figure 2 for Figure 1A schematic diagram of chromatic aberration in a wide-angle optical projection system; Figure 3 for Figure 1 MTF diagram of a medium optical projection system in wide-angle mode; Figure 4 for Figure 1 A schematic diagram of chromatic aberration in a telephoto view of a central optical projection system; Figure 5 for Figure 1 A schematic diagram of the MTF of a medium optical projection system in a telescope state.

[0018] Explanation of icon numbers: 100. Optical projection system; 1. First focusing group; 11. First lens; 2. Second focusing group; 21. Second lens; 22. Third lens; 3. First zoom group; 31. Fourth lens; 4. Second zoom group; 41. Fifth lens; 5. Third zoom group; 51. Sixth lens; 52. Seventh lens; 53. Eighth lens; 54. Ninth lens; 55. Tenth lens; 6. Fixed group; 61. Eleventh lens; 7. Aperture stop.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0023] Current zoom lens technology commonly employs a multi-group, separate design architecture, typically with more than 15 lens elements. This results in bulky and heavy lenses, driving up material and manufacturing costs. Simultaneously, stringent assembly tolerances reduce production yield. While existing improvements (such as aspherical lenses or special coatings) have partially enhanced performance, they have failed to fundamentally reduce the number of lens elements, leading to core drawbacks such as poor portability and low cost-effectiveness.

[0024] This invention proposes a zoom optical projection lens.

[0025] Please see Figure 1In one embodiment of the present invention, the zoom optical projection lens has an object side and an image side arranged opposite each other along the optical axis. The zoom optical projection lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, and an eleventh lens arranged sequentially from the image side to the object side. The first lens constitutes a first focusing group, and the second lens and the third lens constitute a second focusing group. The first focusing group and the second focusing group are movably arranged along the optical axis for focusing. The fourth lens constitutes a first zoom group, the fifth lens constitutes a second zoom group, and the sixth lens, the third lens, the fifth lens, the sixth ... The seventh lens, the eighth lens, the ninth lens, and the tenth lens constitute a third zoom group. The first zoom group, the second zoom group, and the third zoom group are movably arranged along the optical axis for zooming. The eleventh lens constitutes a fixed group. The fourth lens, the sixth lens, the seventh lens, the eighth lens, the tenth lens, and the eleventh lens have positive optical power. The first lens, the second lens, the third lens, the fifth lens, and the ninth lens have negative optical power. The total optical length of the zoom optical projection lens is TTL, TTL≤170mm, and the resolution of the zoom optical projection lens is greater than or equal to 1080P.

[0026] In the technical solution of this invention, the first focusing group and the second focusing group move independently along the optical axis to achieve precise focusing at near and far distances and to adapt to clear imaging at different projection distances: the first focusing group translates along the optical axis to the object side, and the second focusing group translates along the optical axis to the image side. Through the relative movement of the two sets of negative power lenses, the image plane offset of near-distance projection is corrected; the first focusing group translates along the optical axis to the image side, and the second focusing group translates along the optical axis to the object side, to achieve precise convergence of the light field at far distances and ensure clear image plane throughout the entire focusing range. The first, second, and third zoom groups work together to perform differential translation along the optical axis, achieving zoom magnification adjustment to meet the needs of adjusting the size of conventional projection screens: the first zoom group translates along the optical axis to the image side, the second zoom group translates along the optical axis to the object side, and the third zoom group remains fixed. Through the light-gathering effect of the positive-magnitude first zoom group and the light-scattering effect of the negative-magnitude second zoom group, the projection light field is expanded to achieve large-screen projection; the first zoom group translates along the optical axis to the object side, the second zoom group translates along the optical axis to the image side, and the third zoom group translates slightly along the optical axis to the object side. Through the positive-magnitude combination of the third zoom group, the light field is further converged to achieve high-definition projection of small screens; during zooming, the negative-magnitude ninth lens corrects the field curvature generated by the sixth to eighth lenses in real time, and the positive-magnitude tenth lens achieves secondary convergence of the light field, ensuring stable MTF index across the entire zoom range and a resolution of no less than 1080P. The fixed group is fixed to the object-side end of the lens to correct the outgoing light field, suppress stray light, and serve as a mechanical positioning reference for the lens. Zooming and focusing are achieved through the arrangement and movement of 11 lenses, simplifying the mechanical structure to achieve a total optical length of TTL (≤170mm).

[0027] In one embodiment, an aperture stop is used to achieve stray light suppression, aberration-assisted correction, and adaptive brightness adjustment. If BFL / TTL < 0.05: the aperture stop is located at the junction of the focus group and the zoom group, the light field has not completed initial convergence, the control efficiency is low, and it is easy to block the effective imaging light, resulting in a decrease in image brightness; if BFL / TTL > 1: the aperture stop is close to the object-side fixed group, loses its light field control function on the zoom core group, and will significantly increase the axial volume of the lens, exceeding the requirement of TTL ≤ 170mm; therefore, the aperture stop is set between the fifth lens and the sixth lens, and the distance from the aperture stop to the first lens is BFL, satisfying 0.05 ≤ BFL / TTL ≤ 1.

[0028] In one embodiment, the diameter of the first lens is D1, where D1 ≤ 90 mm; the image-side lens is miniaturized to fit a compact lens barrel layout. The image plane diameter of the zoom optical projection lens is IC, where IC ≤ 28 mm; it precisely matches mainstream 1080P imaging chips with no redundant image planes. The aperture value of the zoom optical projection lens is F, where 2.2 ≤ F ≤ 2.8 m; it balances light intake and aberration control, adapting to the entire zoom range.

[0029] In one embodiment, the focal length design of the zoom optical projection lens must satisfy the following: the focal length f of the zoom optical projection lens in wide-angle mode is F1 for the first focusing group, F2 for the second focusing group, F3 for the first zoom group, F4 for the second zoom group, F5 for the third zoom group, and F6 for the fixed group, while also satisfying: -160 ≤ F1≤-30, -11.31≤F1 / f≤2.12; -50≤F2≤0, -3.54≤F2 / f≤0; 20≤F3≤80, 1.41≤F3 / f≤5.66; 10≤F4≤60, 0.70≤F4 / f≤4.24; 300≤F5≤400, 21.19≤F5 / f≤28.27; 10≤F6≤60, 0.70≤F6 / f≤4.24.

[0030] Specifically, each lens satisfies the following conditions: the focal length of the first lens is f1, -160mm ≤ f1 ≤ -30mm; the focal length of the second lens is f2, -60mm ≤ f2 ≤ -10mm; the focal length of the third lens is f3, -60mm ≤ f3 ≤ -10mm; the focal length of the fourth lens is f4, 20mm ≤ f4 ≤ 80mm; the focal length of the fifth lens is f5, 10mm ≤ f5 ≤ 60mm; and the focal length of the sixth lens is... The focal length of the seventh lens is f6, -60mm≤f6≤-10mm; the focal length of the eighth lens is f8, 10mm≤f8≤60mm; the focal length of the ninth lens is f9, -60mm≤f9≤-10mm; the focal length of the tenth lens is f10, 10mm≤f10≤60mm; and the focal length of the eleventh lens is f11, 10mm≤f11≤60mm.

[0031] In one embodiment, the first lens is configured as a plastic aspherical lens to meet the requirements of lightweight design, accurate correction of paraxial aberration, and cost reduction. The second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, and eleventh lenses are all configured as glass spherical lenses to meet the requirements of high optical stability, ease of manufacturing, and guaranteed performance throughout the entire range.

[0032] In one embodiment, the sixth and seventh lenses are cemented together; the eighth and ninth lenses are also cemented together. The cemented lens formed by the fifth, sixth, and seventh lenses can enhance chromatic aberration correction and improve zoom field stability. The cemented lens formed by the eighth and ninth lenses can correct field curvature or coma and reduce stray light.

[0033] By considering lens material, focal length, and whether it is cemented, the Abbe number of the lens is further limited. This achieves a synergistic effect between the Abbe number, optical power, cemented structure, and aberration correction to improve the performance of the zoom optical projection lens. Furthermore, the Abbe number is varied to enhance chromatic aberration correction capabilities. Specifically: the Abbe number of the first lens is V1, 50.0 ≤ V1 ≤ 60.0; the Abbe number of the second lens is V2, 30.0 ≤ V2 ≤ 60.0; the Abbe number of the third lens is V3, 50.0 ≤ V3 ≤ 90.0; the Abbe number of the fourth lens is V4, 20.0 ≤ V4 ≤ 40.0; the Abbe number of the fifth lens is V5, 20.0 ≤ V5 ≤ 50.0; and the Abbe number of the sixth lens is V6. 20.0≤V6≤40.0; the Abbe number of the seventh lens is V7, 60.0≤V7≤90.0; the Abbe number of the eighth lens is V8, 60.0≤V8≤90.0; the Abbe number of the ninth lens is V9, 20.0≤V9≤50.0; the Abbe number of the tenth lens is V10, 60.0≤V10≤90.0; the Abbe number of the eleventh lens is V11, 10.0≤V11≤40.0.

[0034] By setting the refractive index and Abbe number to match, better light field control and aberration correction can be achieved. The refractive index of the first lens is N1, 1.40≤N1≤1.60; the refractive index of the second lens is N2, 1.60≤N2≤1.90; the refractive index of the third lens is N3, 1.40≤N3≤1.60; the refractive index of the fourth lens is N4, 1.60≤N4≤1.90; the refractive index of the fifth lens is N5, 1.60≤N5≤1.90; the refractive index of the sixth lens is N6, 1.70≤N6≤1.90; the refractive index of the seventh lens is N7, 1.40≤N7≤1.60; the refractive index of the eighth lens is N8, 1.40≤N8≤1.60; the refractive index of the ninth lens is N9, 1.70≤N9≤1.95; the refractive index of the tenth lens is N10, 1.40≤N10≤1.60; and the refractive index of the eleventh lens is N11, 1.80≤N11≤2.00.

[0035] In one specific embodiment, the zoom optical projection lens 100 of this embodiment has a focal length f = 14.15mm at the wide-angle end, an aperture value F = 2.8, and a light-emitting surface diameter of 28mm.

[0036] Table 1:

[0037] Table 2 shows one design value for the aspheric coefficient in zoom optical projection lens 100:

[0038] Table 3: With the wide-angle end as the zero point, the following table shows the distance moved by the three zoom groups:

[0039] Figures 2 to 5 This is a simulation diagram of this embodiment.

[0040] This invention also proposes a projector including a zoom optical projection lens. The specific structure of the zoom optical projection lens is as described in the above embodiments. Since this projector adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The zoom optical projection lens has an object side and an image side arranged opposite each other along the optical axis. The zoom optical projection lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, and an eleventh lens arranged sequentially from the image side to the object side. The first lens constitutes a first focusing group, and the second lens and the third lens constitute a second focusing group. The first focusing group and the second focusing group are movably arranged along the optical axis for focusing. The fourth lens constitutes a first zoom group, the fifth lens constitutes a second zoom group, and the sixth lens, the seventh lens, and the image side are arranged opposite each other along the optical axis. The eighth, ninth, and tenth lenses constitute a third zoom group. The first, second, and third zoom groups are movably arranged along the optical axis for zooming. The eleventh lens constitutes a fixed group. The fourth, sixth, seventh, eighth, tenth, and eleventh lenses have positive optical power. The first, second, third, fifth, and ninth lenses have negative optical power. The total optical length of the zoom optical projection lens is TTL, TTL≤170mm, and the resolution of the zoom optical projection lens is greater than or equal to 1080P.

[0041] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A zoom optical projection lens characterized by comprising: The zoom optical projection lens has an object side and an image side that are arranged opposite to each other along the optical axis. The zoom optical projection lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, and an eleventh lens arranged sequentially from the image side to the object side. The first lens constitutes a first focusing group, the second lens and the third lens constitute a second focusing group, and the first focusing group and the second focusing group are movably arranged along the optical axis for focusing; the fourth lens constitutes a first zoom group, the fifth lens constitutes a second zoom group, and the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens constitute a third zoom group, and the first zoom group, the second zoom group, and the third zoom group are movably arranged along the optical axis for zooming; the eleventh lens constitutes a fixed group; The fourth, sixth, seventh, eighth, tenth, and eleventh lenses have positive optical power; the first, second, third, fifth, and ninth lenses have negative optical power. The total optical length of the zoom optical projection lens is TTL, TTL≤170mm, and the resolution of the zoom optical projection lens is greater than or equal to 1080P.

2. The zoom optical projection lens as described in claim 1, characterized in that, The zoom optical projection lens also includes an aperture stop, which is disposed between the fifth lens and the sixth lens. The distance from the aperture stop to the first lens is BFL, which satisfies 0.05≤BFL / TTL≤1.

3. The zoom optical projection lens as described in claim 1, characterized in that, The diameter of the first lens is D1, where D1≤90mm; the image plane diameter of the zoom optical projection lens is IC, where IC≤28mm; and the aperture value of the zoom optical projection lens is F, where 2.2≤F≤2.8m.

4. The zoom optical projection lens as described in claim 1, characterized in that, The focal length f of the zoom optical projection lens in wide-angle mode is F1 for the first focusing group, F2 for the second focusing group, F3 for the first zoom group, F4 for the second zoom group, F5 for the third zoom group, and F6 for the fixed group, while simultaneously satisfying: -160≤F1≤-30,-11.31≤F1 / f≤2.12; -50≤F2≤0,-3.54≤F2 / f≤0; 20≤F3≤80, 1.41≤F3 / f≤5.66; 10≤F4≤60, 0.70≤F4 / f≤4.24; 300≤F5≤400, 21.19≤F5 / f≤28.27; 10≤F6≤60, 0.70≤F6 / f≤4.

24.

5. The zoom optical projection lens as described in claim 4, characterized in that, The focal length of the first lens is f1, -160mm≤f1≤-30mm; The focal length of the second lens is f2, -60mm≤f2≤-10mm; The focal length of the third lens is f3, -60mm≤f3≤-10mm; The focal length of the fourth lens is f4, where 20mm ≤ f4 ≤ 80mm; The focal length of the fifth lens is f5, where 10mm ≤ f5 ≤ 60mm; The focal length of the sixth lens is f6, -60mm≤f6≤-10mm; The focal length of the seventh lens is f7, 10mm≤f7≤60mm; The focal length of the eighth lens is f8, where 10mm ≤ f8 ≤ 60mm; The focal length of the ninth lens is f9, -60mm≤f9≤-10mm; The focal length of the tenth lens is f10, where 10mm ≤ f10 ≤ 60mm; The focal length of the eleventh lens is f11, where 10mm ≤ f11 ≤ 60mm.

6. The zoom optical projection lens as described in claim 1, characterized in that, The first lens is a plastic aspherical lens; the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens and the eleventh lens are all glass spherical lenses.

7. The zoom optical projection lens as described in claim 1, characterized in that, The sixth lens and the seventh lens are cemented together; the eighth lens and the ninth lens are cemented together.

8. The zoom optical projection lens as described in claim 1, characterized in that, The Abbe number of the first lens is V1, where 50.0 ≤ V1 ≤ 60.0; The Abbe number of the second lens is V2, where 30.0 ≤ V2 ≤ 60.0; The Abbe number of the third lens is V3, where 50.0 ≤ V3 ≤ 90.0; The Abbe number of the fourth lens is V4, where 20.0 ≤ V4 ≤ 40.0; The Abbe number of the fifth lens is V5, where 20.0 ≤ V5 ≤ 50.0; The Abbe number of the sixth lens is V6, where 20.0 ≤ V6 ≤ 40.0; The Abbe number of the seventh lens is V7, where 60.0 ≤ V7 ≤ 90.0; The Abbe number of the eighth lens is V8, where 60.0 ≤ V8 ≤ 90.0; The Abbe number of the ninth lens is V9, where 20.0 ≤ V9 ≤ 50.0; The Abbe number of the tenth lens is V10, where 60.0 ≤ V10 ≤ 90.0; The Abbe number of the eleventh lens is V11, where 10.0 ≤ V11 ≤ 40.

0.

9. The zoom optical projection lens as described in claim 1, characterized in that, The refractive index of the first lens is N1, where 1.40 ≤ N1 ≤ 1.60; The refractive index of the second lens is N2, 1.60≤N2≤1.90; The refractive index of the third lens is N3, where 1.40 ≤ N3 ≤ 1.60; The refractive index of the fourth lens is N4, where 1.60 ≤ N4 ≤ 1.90; The refractive index of the fifth lens is N5, where 1.60 ≤ N5 ≤ 1.90; The refractive index of the sixth lens is N6, where 1.70 ≤ N6 ≤ 1.90; The refractive index of the seventh lens is N7, where 1.40 ≤ N7 ≤ 1.60; The refractive index of the eighth lens is N8, where 1.40 ≤ N8 ≤ 1.60; The refractive index of the ninth lens is N9, where 1.70 ≤ N9 ≤ 1.95; The refractive index of the tenth lens is N10, where 1.40 ≤ N10 ≤ 1.60; The refractive index of the eleventh lens is N11, where 1.80 ≤ N11 ≤ 2.

00.

10. A projector, characterized in that, Includes the zoom optical projection lens as described in any one of claims 1 to 9.

Images