High magnification zoom projection optical system and projection apparatus

Abstract

The utility model discloses a high-magnification zoom projection optical system and projection equipment, and the high-magnification zoom projection optical system is provided with an object side and an image side which are oppositely arranged along the direction of an optical axis. The high-magnification zoom projection optical system comprises a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group, a sixth lens group, a galvanometer, an equivalent prism and a photosensitive chip which are sequentially arranged from an object side to an image side, the first lens group, the second lens group, the third lens group, the fourth lens group and the fifth lens group are movably arranged along the extension direction of the optical axis, the first lens group is used for focusing, and the second lens group, the third lens group, the fourth lens group and the fifth lens group are used for zooming. According to the high-magnification zoom projection optical system, the wide-angle end projection ratio is smaller than or equal to 0.9, the zoom ratio is larger than or equal to 1.6, and the zoom high-magnification zoom projection optical system which is small in size, high in magnification and small in projection ratio numerical value is provided.

Description

Technical Field

[0001] The utility model relates to the technical field of optical projection, in particular to a high-magnification zoom projection optical system and projection equipment. Background Art

[0002] Projectors are widely used in education, home use and other fields. Zoom projection lenses can change the size of the picture without changing the projection distance, and their flexibility is highly favored by consumers. As the core component of the projector, the lens determines the range of the picture size that can be changed.

[0003] Existing large-magnification lenses are generally large in size, which will cause the overall projector to be relatively large. At the same time, the starting data of the projection ratio of existing large-magnification lenses is generally greater than 1.2. When projecting a picture of the same size, the smaller the projection ratio data, the closer the projection distance. Therefore, lenses with smaller projection ratios are more likely to meet the space requirements of different scenes. Utility Model Content

[0004] The main purpose of the utility model is to provide a high-magnification zoom projection optical system, aiming to provide a zoom high-magnification zoom projection optical system with small volume, high magnification and small projection ratio.

[0005] To achieve the above-mentioned purpose, the utility model provides a high-magnification zoom projection optical system, the high-magnification zoom projection optical system has an object side and an image side which are arranged opposite to each other along the optical axis direction, the high-magnification zoom projection optical system comprises a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group, a sixth lens group, a galvanometer, an equivalent prism and a photosensitive chip which are arranged in sequence from the object side to the image side, the first lens group, the second lens group, the third lens group, the fourth lens group and the fifth lens group are movably arranged along the extension direction of the optical axis, the first lens group is used for focusing, and the second lens group, the third lens group, the fourth lens group and the fifth lens group are used for zooming;

[0006] The focal length of the high-magnification zoom projection optical system at the wide-angle end is fw, the focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, the focal length of the fourth lens group is f4, the focal length of the fifth lens group is f5, and the focal length of the sixth lens group is f6. The high-magnification zoom projection optical system meets the following conditions:

[0007] 1.7<|f1 / fw|<2.3; and 9.7<|f2 / fw|<10.3; and 4.5<|f3 / fw|<5.1; and 3.8<|f4 / fw|<4.5; and 4.2<|f5 / fw|<4.8; and 5.0<|f6 / fw|<5.5.

[0008] Optionally, the optical focal length of the first lens group is negative, the optical focal length of the second lens group is positive, the optical focal length of the third lens group is positive, the optical focal length of the fourth lens group is negative, the optical focal length of the fifth lens group is positive, and the optical focal length of the sixth lens group is positive.

[0009] Optionally, the first lens group includes a first lens with negative optical power, a second lens with negative optical power, a third lens with negative optical power, and a fourth lens with positive optical power;

[0010] The second lens is a glass aspherical lens;

[0011] The optical focal power of the first lens is φ1, the optical focal power of the second lens is φ2, and the optical focal power of the third lens and the fourth lens is φ34, wherein 0.018<|φ1|<0.025; and 0.025<|φ2|<0.035; and 0.001<|φ34|<0.003.

[0012] Optionally, the second lens group includes a fifth lens with positive optical power;

[0013] The optical power of the fifth lens is φ5, 0.008<|φ5|<0.015.

[0014] Optionally, the third lens group includes a sixth lens with positive optical power;

[0015] The optical power of the sixth lens is φ6, 0.018<|φ6|<0.025.

[0016] Optionally, the fourth lens group includes a seventh lens having negative optical power;

[0017] The optical power of the seventh lens is φ7, 0.02<|φ7|<0.03.

[0018] Optionally, the fifth lens group includes an aperture, an eighth lens with positive focal power, a ninth lens with negative focal power, a tenth lens with positive focal power, an eleventh lens with positive focal power, a twelfth lens with negative focal power, a thirteenth lens with positive focal power, and a fourteenth lens with positive focal power;

[0019] The tenth lens is a glass aspherical lens;

[0020] The eighth lens and the ninth lens are cemented and connected to form a double cemented lens;

[0021] The eleventh lens, the twelfth lens and the thirteenth lens are cemented and connected to form a triplet lens;

[0022] The optical focal powers of the eighth lens and the ninth lens are φ89, the optical focal power of the tenth lens is φ10, the optical focal powers of the eleventh lens, the twelfth lens and the thirteenth lens are φ111213, and the optical focal power of the fourteenth lens is φ14; wherein, 0.02<|φ7|<0.03; and 0.02<|φ89|<0.03; and 0.035<|φ10|<0.042; and 0.025<|φ111213|<0.032; and 0.025<|φ14|<0.035.

[0023] Optionally, the sixth lens group includes a fifteenth lens with positive optical power;

[0024] The optical power of the fifteenth lens is φ15, 0.015<|φ15|<0.025.

[0025] Optionally, the total optical length of the high-magnification zoom projection optical system is TTL, and the high-magnification zoom projection optical system satisfies: TTL / fw≤16.3.

[0026] The utility model also provides a projection device, which comprises the high-magnification zoom projection optical system.

[0027] In the technical solution provided by the utility model, the first lens group is movably mounted on the lens barrel along the optical axis direction for focusing, and the second lens group, the third lens group, the fourth lens group and the fifth lens group move cooperatively along the optical axis direction for zooming, so that the high-magnification zoom projection optical system keeps the image on the image plane clear during the zooming process, and conditionally restricts the ratio of the focal length of the six lens groups to the focal length of the high-magnification zoom projection optical system at the wide-angle end, so that the zoom ratio of the high-magnification zoom projection optical system is greater than or equal to 1.60, the projection ratio value at the zoom starting point is controlled to be less than or equal to 0.9, the total optical length of the high-magnification zoom projection optical system is small, and the ratio of the total optical length to the focal length at the wide-angle end is less than or equal to 16.3, so as to provide a small-volume, high-magnification, and small-projection-ratio zoom high-magnification zoom projection optical system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0029] Figure 1A schematic diagram of the high-magnification zoom projection optical system provided by the utility model when it is at the wide-angle end;

[0030] Figure 2 A schematic diagram of the high-magnification zoom projection optical system provided by the utility model when it is at the telephoto end;

[0031] Figure 3 is a schematic diagram of MTF when the high-magnification zoom projection optical system is at a wide-angle end;

[0032] Figure 4 It is a schematic diagram of MTF when the high-magnification zoom projection optical system is at the telephoto end.

[0033] Description of Figure Numbers:

[0034] Label name Label name 100 First lens group 7 Seventh lens 200 Second mirror group 8 The eighth lens 300 The third mirror group 9 The ninth lens 400 Fourth mirror group 10 Tenth lens 500 Fifth mirror group 11 Eleventh lens 600 Sixth lens group 12 Twelfth lens 1 First lens 13 Thirteenth lens 2 Second lens 14 Fourteenth lens 3 The third lens 15 The fifteenth lens 4 The fourth lens a Galvanometer 5 Fifth lens b Equivalent prism 6 The sixth lens c Photosensitive chip

[0035] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0039] Projectors are widely used in education, home use and other fields. Zoom projection lenses can change the size of the picture without changing the projection distance, and their flexibility is highly favored by consumers. As the core component of the projector, the lens determines the range of the picture size. The existing large-magnification lenses are generally large in size, which will cause the overall projector to be relatively large. At the same time, the starting data of the existing large-magnification lens projection ratio is generally greater than 1.2. Because when projecting the same size of the picture, the smaller the projection ratio data, the closer the projection distance, so the lens with a smaller numerical projection ratio is easier to meet the space requirements of different scenes.

[0040] In order to solve the above problems, the utility model provides a high-magnification zoom projection optical system. Figure 1 to Figure 2 The utility model provides a specific embodiment of the high-magnification zoom projection optical system.

[0041] See also Figure 1 to Figure 2 The high-magnification zoom projection optical system has an object side and an image side which are arranged opposite to each other along the optical axis direction. The high-magnification zoom projection optical system comprises a first lens group 100, a second lens group 200, a third lens group 300, a fourth lens group 400, a fifth lens group 500, a sixth lens group 600, a galvanometer a, an equivalent prism b and a photosensitive chip c which are arranged in sequence from the object side to the image side. The first lens group 100, the second lens group 200, the third lens group 300, the fourth lens group 400 and the fifth lens group 500 are movably arranged along the extension direction of the optical axis. The first lens group 100 is used for zooming, and the second lens group 200, the third lens group 300, the fourth lens group 400 and the fifth lens group 500 are used for focusing.

[0042] The focal length of the high-magnification zoom projection optical system at the wide-angle end is fw, the focal length of the first lens group 100 is f1, the focal length of the second lens group 200 is f2, the focal length of the third lens group 300 is f3, the focal length of the fourth lens group 400 is f4, the focal length of the fifth lens group 500 is f5, and the focal length of the sixth lens group 600 is f6. The high-magnification zoom projection optical system meets the following conditions:

[0043] 1.7<|f1 / fw|<2.3; and 9.7<|f2 / fw|<10.3; and 4.5<|f3 / fw|<5.1; and 3.8<|f4 / fw|<4.5; and 4.2<|f5 / fw|<4.8; and 5.0<|f6 / fw|<5.5.

[0044] It is understandable that |f1 / fw| can be set to 1.71, 1.76, 1.81, 1.86, 1.91, 1.96, 2.01, 2.06, 2.11, 2.16, 2.21, 2.26, 2.29...

[0045] |f2 / fw| can be set to 9.71, 9.76, 9.81, 9.86, 9.91, 9.96, 10.01, 10.06, 10.11, 10.16, 10.21, 10.26, 10.29...

[0046] |f3 / fw| can be set to 4.51, 4.56, 4.61, 4.66, 4.71, 4.76, 4.81, 4.86, 4.91, 4.96, 5.01, 5.06, 5.09...

[0047] |f4 / fw| can be set to 3.81, 3.86, 3.91, 3.96, 4.01, 4.06, 4.11, 4.16, 4.21, 4.26, 4.31, 4.36, 4.41, 4.46...

[0048] |f5 / fw| can be set to 4.21, 4.26, 4.31, 4.36, 4.41, 4.46, 4.51, 4.56, 4.61, 4.66, 4.71, 4.76, 4.79...

[0049] |f6 / fw| can be set to 5.01, 5.06, 5.11, 5.16, 5.21, 5.26, 5.31, 5.36, 5.41, 5.46, 5.49...

[0050] It should be noted that the first lens group 100, the second lens group 200, the third lens group 300, the fourth lens group 400 and the fifth lens group 500 can be driven by an external force to move along the optical axis, wherein the external force driving can be driven by a driving motor or manually adjusted without limitation.

[0051] It should also be noted that the galvanometer a has the function of periodic vibration and improving pixels. Specifically, the galvanometer a can periodically vibrate, change the optical path, and improve pixels. By adjusting the angle of the galvanometer a, the system pixels can be improved.

[0052] The equivalent prism b plays the role of optical beam splitting and dispersion correction. The equivalent prism b can split the incident light into different paths to achieve the effect of optical beam splitting, so that the light propagates in the required direction. The equivalent prism b can also perform dispersion correction to help adjust the propagation paths of light of different wavelengths to reduce the impact of chromatic aberration on imaging quality.

[0053] In the technical solution provided by the utility model, the first lens group 100 is movably mounted on the lens barrel along the optical axis direction for focusing, and the second lens group 200, the third lens group 300, the fourth lens group 400 and the fifth lens group 500 move cooperatively along the optical axis direction for zooming, so that the high-magnification zoom projection optical system keeps the image plane clear during the zooming process, and the zoom ratio of the high-magnification zoom projection optical system is greater than or equal to 1.60 through the conditional restriction of the ratio of the focal length of the six lens groups to the focal length of the high-magnification zoom projection optical system at the wide-angle end, and the projection ratio value at the zoom starting point is controlled to be less than or equal to 0.9, the high-magnification zoom projection optical system has a small total optical length, and the ratio of the total optical length to the focal length at the wide-angle end is less than or equal to 16.3, so as to provide a small-volume, high-magnification, and small-projection-ratio zoom high-magnification zoom projection optical system.

[0054] In this embodiment, the optical focal length of the first lens group 100 is negative, the optical focal length of the second lens group 200 is positive, the optical focal length of the third lens group 300 is positive, the optical focal length of the fourth lens group 400 is negative, the optical focal length of the fifth lens group 500 is positive, and the optical focal length of the sixth lens group 600 is positive.

[0055] In a specific embodiment, the first lens group 100 includes a first lens 1 with negative optical power, a second lens 2 with negative optical power, a third lens 3 with negative optical power, and a fourth lens 4 with positive optical power; the second lens group 200 includes a fifth lens 5 with positive optical power; the third lens group 300 includes a sixth lens 6 with positive optical power; the fourth lens group 400 includes a seventh lens 7 with negative optical power; the fifth lens group 500 includes an aperture, an eighth lens 8 with positive optical power, a ninth lens 9 with negative optical power, a tenth lens 10 with positive optical power, an eleventh lens 11 with positive optical power, a twelfth lens 12 with negative optical power, a thirteenth lens 13 with positive optical power, and a fourteenth lens 14 with positive optical power; the sixth lens group 600 includes a fifteenth lens 15 with positive optical power.

[0056] The focal power of the first lens 1 is φ1, the focal power of the second lens 2 is φ2, the focal power of the third lens 3 and the fourth lens 4 is φ34, the focal power of the fifth lens 5 is φ5, the focal power of the sixth lens 6 is φ6, the focal power of the seventh lens 7 is φ7, the focal power of the eighth lens 8 and the ninth lens 9 is φ89, the focal power of the tenth lens 10 is φ10, the focal powers of the eleventh lens 11, the twelfth lens 12 and the thirteenth lens 13 are φ111213, the focal power of the fourteenth lens 14 is φ14, and the focal power of the fifteenth lens 15 is φ15; wherein, 0.018<|φ1|<0.025; and 0.025<|φ2|<0.035; and 0.001<|φ34|<0.003; and 0.008<|φ5|<0.015; and 0.018<|φ6|<0.025; and 0.02<|φ7|<0.03, and 0.02<|φ7|<0.03; and 0.02<|φ89|<0.03; and 0.035<|φ10|<0.042; and 0.025<|φ111213|<0.032; and 0.025<|φ14|<0.035; and 0.015<|φ15|<0.025.

[0057] In order to reduce light energy loss, increase imaging clarity, protect the scale surface, and further optimize the processing flow to meet the design requirements, in this embodiment, the eighth lens 8 and the ninth lens 9 are glued together to form a double glued lens; the eleventh lens 11, the twelfth lens 12, and the thirteenth lens 13 are glued together to form a triple glued lens. In this way, the glued parts are used reasonably to allow optical components to improve the image quality of the optical system.

[0058] Specifically, in a specific embodiment, the material refractive index, curvature radius, and thickness interval of the lens in this embodiment are shown in Table 1 below:

[0059] Table 1

[0060]

[0061]

[0062]

[0063] In this embodiment, the second lens 2 is a glass aspheric lens; the tenth lens 10 is a glass aspheric lens. The characteristics of the aspheric lens are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, the aspheric lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using the aspheric lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality of the lens, and the use of a glass lens can reduce the influence of temperature on the optical performance of the lens.

[0064] Glass lenses are not easily affected by thermal expansion and contraction and thus are less likely to shift focus. Therefore, they can resist thermal deformation and maintain high precision for a long time. Spherical lenses can reduce costs while ensuring image quality and reliability, and have lower assembly sensitivity, thereby improving the yield of finished products.

[0065] Further, in this embodiment, the aspheric surface shape of the aspheric lens satisfies the following conditions:

[0066]

[0067] Wherein, c is the curvature corresponding to the radius, y is the radial coordinate (its unit is the same as the lens length unit), k is the coefficient of the conic quadratic curve (when the k coefficient is less than -1, the surface curve is a hyperbola, when the k coefficient is equal to -1, it is a parabola, when the k coefficient is between -1 and 0, it is an ellipse, when the k coefficient is equal to 0, it is a circle, and when the k coefficient is greater than 0, it is an oblate circle), A, B, C, D, E, F, G are high-order aspheric coefficients (please refer to Table 2 below). The above parameters can be used to set the shape and size of the aspheric surfaces of the object side and image side of the lens.

[0068] Table 2 Conic coefficients and aspheric coefficients corresponding to aspheric lenses

[0069]

[0070] With this setting, by reasonably allocating the lens power, adjusting the glass shape and material combination, effectively eliminating chromatic aberration and secondary spectrum, the spherical aberration, coma, astigmatism, etc. on each lens compensate and cancel each other out, so as to achieve a clear imaging effect and realize the optimal correction of high-order aberrations and chromatic aberrations.

[0071] In this embodiment, the total optical length of the high-magnification zoom projection optical system is TTL, and the high-magnification zoom projection optical system satisfies: TTL / fw≤16.3.

[0072] The distance from the object side of the high-magnification zoom projection optical system to the object side surface of the first lens 1 is defined as the projection distance, and the projection distance varies from 0.5m to infinity. When the projection distance changes, the first lens group 100 moves forward and backward to focus, and the second lens group 200, the third lens group 300, the fourth lens group 400, the fifth lens group 500 and the sixth lens group 600 remain fixed. When the projection distance of the high-magnification zoom projection optical system is set to 2.4m, the intervals between the lens groups from the Wide end (wide-angle end) to the Tele end (telephoto end) are as follows:

[0073] Table 3

[0074] Face number wide end Tele 7 19.53 3.74 9 8.18 0.94 11 13.48 20.50 13 5.00 2.28 25 0.09 18.83

[0075] Specifically, in this embodiment, the zoom optical system also includes a filter, which is located between the sixth lens group 600 and the image plane. The filter is used to filter out light of unnecessary bands and stray light to reduce optical noise and reduce difficulties for subsequent photoelectric module processing. The filter can also be used to adjust the color of the object during the final imaging, thereby improving the imaging quality.

[0076] Specifically, the image plane can be understood as the surface of the photosensitive chip c facing the object side, that is, it can be the surface of an imaging element such as a CCD or a CMOS. It can be understood that the light carrying the information of the object can pass through the first lens group 100, the second lens group 200, the third lens group 300, the fourth lens group 400, the fifth lens group 500, the sixth lens group 600, and the filter in sequence and finally form an image on the image plane.

[0077] In this embodiment, please refer to Figure 1 to Figure 2 , which are schematic diagrams of the structure of the zoom optical system when it is at the wide-angle end and the telephoto end respectively. Figure 3 to Figure 4 The MTF diagrams of the zoom optical system at the wide-angle end and the telephoto end are shown respectively. As can be seen from the above diagrams, the spherical aberration, field curvature and distortion of the zoom optical system in this embodiment can be well corrected at the intermediate magnification, wide-angle end and telephoto end.

[0078] The utility model sets the first lens group 100 to have a negative focal length, wherein the second lens 2 is set to be an aspherical lens to correct distortion and reduce the height of light entering the rear group, the second lens group 200 is set to have a positive focal length, the third lens group 300 is set to have a positive focal length, the fourth lens group 400 is set to have a positive focal length, and the fifth lens 5 is set to have a positive focal length. The second lens group 200, the third lens group 300, the fourth lens group 400 and the fifth lens group 500 are linked to ensure that the image plane position remains unchanged during the zooming process, and the wide-angle end projection ratio is less than or equal to 0.9 and the zoom ratio is greater than or equal to 1.6. The sixth lens group 600 is set to have a positive focal length to converge the residual aberration of the system, realize a telecentric optical system, and enable the system to obtain higher imaging quality.

[0079] In addition, the utility model also provides a camera device, which includes the high-magnification zoom projection optical system described in the above-mentioned technical solution. Since the camera device includes the high-magnification zoom projection optical system, the specific structure of the high-magnification zoom projection optical system refers to the above-mentioned embodiment. Since the high-magnification zoom projection optical system of the camera device adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0080] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A high-magnification zoom projection optical system, characterized in that: The high-magnification zoom projection optical system has an object side and an image side which are arranged opposite to each other along the optical axis direction. The high-magnification zoom projection optical system comprises a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group, a sixth lens group, a galvanometer, an equivalent prism and a photosensitive chip which are arranged in sequence from the object side to the image side. The first lens group, the second lens group, the third lens group, the fourth lens group and the fifth lens group are movably arranged along the extension direction of the optical axis. The first lens group is used for zooming, and the second lens group, the third lens group, the fourth lens group and the fifth lens group are used for focusing. The focal length of the high-magnification zoom projection optical system at the wide-angle end is fw, the focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, the focal length of the fourth lens group is f4, the focal length of the fifth lens group is f5, and the focal length of the sixth lens group is f6. The high-magnification zoom projection optical system meets the following conditions: 1.7<|f1 / fw|<2.3; and 9.7<|f2 / fw|<10.3; and 4.5<|f3 / fw|<5.1; and 3.8<|f4 / fw|<4.5; and 4.2<|f5 / fw|<4.8; and 5.0<|f6 / fw|<5.

5.

2. The high-magnification zoom projection optical system according to claim 1, characterized in that: The optical focal length of the first lens group is negative, the optical focal length of the second lens group is positive, the optical focal length of the third lens group is positive, the optical focal length of the fourth lens group is negative, the optical focal length of the fifth lens group is positive, and the optical focal length of the sixth lens group is positive.

3. The high-magnification zoom projection optical system according to claim 1, characterized in that: The first lens group includes a first lens with negative optical power, a second lens with negative optical power, a third lens with negative optical power, and a fourth lens with positive optical power; The second lens is a glass aspherical lens; The optical focal power of the first lens is φ1, the optical focal power of the second lens is φ2, and the optical focal power of the third lens and the fourth lens is φ34, wherein 0.018<|φ1|<0.025; and 0.025<|φ2|<0.035; and 0.001<|φ34|<0.

003.

4. The high-magnification zoom projection optical system according to claim 1, characterized in that: The second lens group includes a fifth lens having positive optical power; The optical power of the fifth lens is φ5, 0.008<|φ5|<0.

015.

5. The high-magnification zoom projection optical system according to claim 1, wherein: The third lens group includes a sixth lens with positive optical power; The optical power of the sixth lens is φ6, 0.018<|φ6|<0.

025.

6. The high-magnification zoom projection optical system according to claim 1, characterized in that: The fourth lens group includes a seventh lens having negative optical power; The optical power of the seventh lens is φ7, 0.02<|φ7|<0.

03.

7. The high-magnification zoom projection optical system according to claim 1, characterized in that: The fifth lens group includes an aperture, an eighth lens with positive focal power, a ninth lens with negative focal power, a tenth lens with positive focal power, an eleventh lens with positive focal power, a twelfth lens with negative focal power, a thirteenth lens with positive focal power, and a fourteenth lens with positive focal power; The tenth lens is a glass aspherical lens; The eighth lens and the ninth lens are cemented and connected to form a double cemented lens; The eleventh lens, the twelfth lens and the thirteenth lens are cemented and connected to form a triplet lens; The optical focal powers of the eighth lens and the ninth lens are φ89, the optical focal power of the tenth lens is φ10, the optical focal powers of the eleventh lens, the twelfth lens and the thirteenth lens are φ111213, and the optical focal power of the fourteenth lens is φ14; wherein, 0.02<|φ7|<0.03; and 0.02<|φ89|<0.03; and 0.035<|φ10|<0.042; and 0.025<|φ111213|<0.032; and 0.025<|φ14|<0.

035.

8. The high-magnification zoom projection optical system according to claim 1, characterized in that: The sixth lens group includes a fifteenth lens having positive optical power; The optical power of the fifteenth lens is φ15, 0.015<|φ15|<0.

025.

9. The high-magnification zoom projection optical system according to claim 1, wherein: The total optical length of the high-magnification zoom projection optical system is TTL, and the high-magnification zoom projection optical system satisfies: TTL / fw≤16.

3.

10. A projection device, characterized in that: It comprises the high-magnification zoom projection optical system as described in any one of claims 1 to 9.

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