Miniaturized, large-surface, high-definition zoom optical system

Abstract

A miniaturized high-definition zoom optical system with a large target surface comprises, from the object side to the image side, a fixed lens group with positive optical power, a front zoom lens group with negative optical power, an aperture stop, a middle zoom lens group with positive optical power, a focusing lens group with positive optical power, a rear zoom lens group with positive optical power and an imaging surface. The front zoom lens group moves from the object side to the image side along the optical axis as a whole, the middle zoom lens group moves from the image side to the object side along the optical axis, and the rear zoom lens group moves from the object side to the image side along the optical axis, so as to achieve a zoom from a wide-angle end to a telephoto end. By moving the focusing lens group along the optical axis, the defocus caused by the zoom process and the change of object distance is corrected. The present invention can achieve a larger imaging circular diameter in an extremely small volume, and at the same time has a higher zoom ratio and a 4K high-definition resolution level, is compatible with an infrared confocal function, and can be used in a variety of modes in a low-light environment, with good effects.

Description

Technical Field

[0001] The present invention relates to an optical system used in the field of security monitoring, specifically a high-zoom-ratio, 4K high-definition zoom lens with a telephoto end focal length to total length ratio of more than 1.75, an imaging circle diameter to total length ratio of more than 0.07, and extremely low-light shooting capability. Background Art

[0002] All-weather surveillance lenses generally use infrared imaging technology, expanding the lens aperture, or increasing the target surface and pixel size to ensure image quality in low-light environments. However, infrared imaging technology will lose the color information of the scene, and cannot meet the use requirements in scenes with color requirements such as road monitoring; expanding the lens aperture is not suitable for zoom lenses, and the full-magnification aperture expansion from the wide-angle end to the telephoto end will cause lens performance loss and increased design difficulty; the technology of increasing the target surface and pixel size has very strict requirements on the imaging surface size and the imaging circle diameter of the optical lens. Summary of the invention

[0003] In view of the defects and shortcomings of the prior art, the present invention proposes a miniaturized large-target high-definition zoom optical system, which can achieve a larger imaging circular diameter in an extremely small volume, and at the same time has a higher zoom ratio and 4K high-definition resolution level, is compatible with infrared confocal function, and can be used in multiple modes in low-light environments, with good effects.

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

[0005] The present invention comprises, from the object side to the image side, a fixed lens group with positive optical power, a front zoom lens group with negative optical power, an aperture stop, a middle zoom lens group with positive optical power, a focusing lens group with positive optical power, a rear zoom lens group with positive optical power and an imaging surface, wherein the front zoom lens group moves as a whole from the object side to the image side along the optical axis, while the middle zoom lens group moves from the image side to the object side along the optical axis, and the rear zoom lens group moves from the object side to the image side along the optical axis, so as to achieve a magnification change from a wide-angle end to a telephoto end, and by moving the focusing lens group along the optical axis, the defocus caused by the magnification change process and the change in object distance is corrected.

[0006] The imaging surface is preferably provided with a filter and a protective glass for filtering out light of unnecessary wavelengths and stray light.

[0007] The imaging surface is provided with solid-state imaging elements such as CCD and CMOS.

[0008] The fixed lens group includes: a cemented lens composed of a lens with negative optical focal length and a lens with positive optical focal length, and at least two lenses with positive optical focal length, wherein: the cemented lens ensures the extension of the focal length of the telephoto end and the stability of the light trend, and the lens with positive optical focal length uses anomalous dispersion glass to converge the infrared chromatic aberration at the telephoto end.

[0009] The front zoom lens group includes two lenses with negative optical power and one lens with positive optical power, so that the lens can zoom from the wide-angle end to the telephoto end.

[0010] The two lenses with negative optical power are preferably a lens with a convex front surface and a concave rear surface and a lens with both the front and rear surfaces being concave.

[0011] After the lens with positive optical power, a lens with negative optical power is preferably placed to increase the zoom ratio of the lens.

[0012] The lens with positive refractive power in the front zoom lens group is preferably made of a high Abbe number material to ensure that the off-axis chromatic aberration at the telephoto end does not overflow.

[0013] The lenses in the front zoom lens group preferably all adopt aspherical shapes, so as to improve the coma aberration at the telephoto end of the lens.

[0014] The medium zoom lens group comprises: at least two lenses with positive focal power and a cemented lens composed of a lens with positive focal power and a lens with negative focal power.

[0015] The lens with positive power in the medium zoom lens group preferably uses anomalous dispersion glass to converge various chromatic aberrations at the wide-angle end, and further preferably uses an aspherical mirror to improve the coma aberration of the lens at the wide-angle end.

[0016] The focusing lens group includes a lens with positive focal length and a lens with negative focal length.

[0017] The lens with positive optical power in the focusing lens group preferably uses an aspherical surface to improve the coma aberration at the wide-angle end of the lens.

[0018] The rear zoom lens group includes: a lens with negative optical power and at least one lens with positive optical power, thereby effectively increasing the effective imaging circle diameter of the lens and further converging the light to form an image.

[0019] The lens with negative optical power in the rear zoom lens group is preferably a lens with concave front and rear surfaces.

[0020] The aperture of the aperture diaphragm is enlarged or reduced accordingly with the lens magnification.

[0021] The overall structure of the high-definition zoom optical system further satisfies: Where: f t is the focal length of the lens at the telephoto end, TTL is the total optical length of the lens, Y is the imaging circle diameter of the lens, FOV w FOV is the maximum field of view of the lens at the wide-angle end. t It is the maximum field of view of the lens at the telephoto end.

[0022] The overall structure of the fixed lens group further satisfies the following conditions simultaneously:

[0023] in: is the effective diameter of the rear surface of the lens group, Fno t is the aperture diameter of the lens at the telephoto end, L S1R-IMG It is the distance from the rear surface of the last lens in the fixed lens group to the imaging surface;

[0024] Where: Vd s1m is the Abbe number of the lens with negative focal power in the cemented lens, Vd s1p is the Abbe number of the lens with positive focal power in the cemented lens, Nd s1m is the refractive index of the lens with negative focal power in the cemented lens, Nd s1p is the refractive index of the lens with positive power in the cemented lens;

[0025] The overall structure of the front zoom lens group further satisfies the following conditions simultaneously:

[0026] Where: f t is the focal length of the lens at the telephoto end, f w is the focal length of the lens at the wide-angle end, L t-w The distance that the front zoom lens group moves when changing from the telephoto end to the wide-angle end;

[0027] Where: f s2l1 is the focal length of the first lens in the front zoom lens group, f s2l2 / 3 is the sum of the focal lengths of the second and third lenses in the front zoom lens group, f s2l4 is the focal length of the fourth lens in the front zoom lens group. If there is no fourth lens in the structure, the value is 0;

[0028] Where: Vd s2m Vd is the Abbe number of the second lens with negative focal power in the front zoom lens group. s2p is the Abbe number of the lens with positive focal power in the front zoom lens group, Nds2m Nd is the refractive index of the second lens with negative power in the front zoom lens group. s2p It is the refractive index of the lens with positive power in the front zoom lens group.

[0029] The overall structure of the medium zoom lens group further satisfies the following conditions simultaneously:

[0030] in: Fno is the effective diameter of the front surface of the first lens in the medium zoom lens group. w is the aperture diameter of the overall lens at the wide-angle end, L S3F-STP is the distance from the front surface of the first lens of the medium zoom lens group to the aperture stop STP;

[0031] Where: V ds3l1 is the refractive index of the first lens in the medium zoom lens group, f s3l1 is the focal length of the first lens in the medium zoom lens group, V ds3l2 is the refractive index of the second lens in the medium zoom lens group, f s3l2 is the focal length of the second lens in the medium zoom lens group.

[0032] The overall structure of the focusing lens group further satisfies: in: is the effective diameter of the front surface of the first lens of the focusing lens group, f S4 is the overall focal length of the focusing lens group.

[0033] The overall structure of the rear zoom lens group further satisfies the following conditions simultaneously:

[0034] Where: Y is the imaging circle diameter of the lens, f S5 is the overall focal length of the rear zoom lens group;

[0035] b)Nd s5l1 >1.90, where: Nds5l1 is the refractive index of the first lens in the rear zoom lens group;

[0036] Among them: fs5p is the overall focal length of the lenses with positive optical power in the rear zoom lens group, and fs5m is the focal length of the lenses with negative optical power in the rear zoom lens group.

[0037] Technical Effects

[0038] Compared with the prior art, the optical system of the present invention can simultaneously meet the requirements of a large zoom ratio and a large imaging circular diameter within an extremely short length, wherein the ratio of the focal length at the telephoto end to the total length is greater than 1.75, and the ratio of the imaging circular diameter to the total length is greater than 0.07; and the present invention can also form an image under the condition of an ambient light of only 0.0001lux, and the image is rich in details, bright in color, and high in sharpness. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A cross-sectional view along the optical axis of the zoom lens of Example 1 and the moving directions of each group during the change from the wide-angle end to the telephoto end;

[0040] Figure 2 1 is a diagram of various aberrations of the zoom lens of Example 1 with respect to the d-line at the wide-angle end;

[0041] Figure 3 1 is a diagram of various aberrations of the zoom lens of Example 1 at the telephoto end with respect to the d-line;

[0042] Figure 4 A cross-sectional view along the optical axis of the zoom lens of Example 2 and the moving directions of each group during the change from the wide-angle end to the telephoto end;

[0043] Figure 5 1 is a diagram of various aberrations of the zoom lens of Example 2 at the wide angle end with respect to the d-line;

[0044] Figure 6 1 is a diagram of various aberrations of the zoom lens system of Example 2 at the telephoto end with respect to the d-line;

[0045] Figure 7 A cross-sectional view along the optical axis of the zoom lens of Example 3 and the moving directions of each group during the change from the wide-angle end to the telephoto end;

[0046] Figure 8 1 is a diagram of various aberrations of the zoom lens of Example 3 at the wide angle end with respect to the d-line;

[0047] Fig. 9 1 is a diagram of various aberrations of the zoom lens of Example 3 at the telephoto end with respect to the d-line;

[0048] In the figure: fixed lens group G1, front zoom lens group G2, aperture stop STP, middle zoom lens group G3, focusing lens group G4, rear zoom lens group G5, imaging surface IMG, L1~L18 are the first to eighteenth lenses, filter IRCF, and protective glass CG. DETAILED DESCRIPTION

[0049] Example 1

[0050] like Figure 1As shown, the optical system of this embodiment includes, from the object side to the image side, a fixed lens group G1 with positive optical power, a front zoom lens group G2 with negative optical power, an aperture stop STP, a middle zoom lens group G3 with positive optical power, a focusing lens group G4 with positive optical power, a rear zoom lens group G5 with positive optical power and an imaging surface IMG, wherein: the front zoom lens group G2 moves as a whole from the object side to the image side along the optical axis, while the middle zoom lens group G3 moves along the optical axis from the image side to the object side, and the rear zoom lens group G5 moves along the optical axis from the object side to the image side, so as to achieve a magnification change from the wide-angle end to the telephoto end, and by moving the focusing lens group G4 along the optical axis, the defocus caused by the magnification change process and the change in object distance is corrected.

[0051] The imaging surface IMG is preferably provided with a filter IRCF for filtering out light of unnecessary wavelengths and stray light.

[0052] The imaging surface IMG is provided with solid-state imaging elements such as CCD and CMOS.

[0053] The fixed lens group G1 includes: a first lens L1 with a convex front surface and a concave rear surface and positive optical power, a second lens L2 with a convex front surface and a concave rear surface and negative optical power, a third lens L3 with a convex front surface and a concave rear surface and positive optical power, and a fourth lens L4 with a convex front surface and a concave rear surface and positive optical power, wherein: the second lens L2 with negative optical power is cemented with the third lens L3 with positive optical power.

[0054] The front zoom lens group G2 includes: a fifth lens L5 with negative optical power whose front surface is convex and whose rear surface is concave, a sixth lens L6 with negative optical power whose front and rear surfaces are both concave, a seventh lens L7 with positive optical power whose front and rear surfaces are both convex, and an eighth lens L8 with negative optical power whose front and rear surfaces are both concave, wherein: the sixth lens L6 with negative optical power is cemented with the seventh lens L7 with positive optical power, and the eighth lens L8 with negative optical power is a double-sided aspherical structure.

[0055] The medium zoom lens group G3 includes: a ninth lens L9 with positive focal power and convex front and rear surfaces, a tenth lens L10 with positive focal power and convex front surface and concave rear surface, an eleventh lens L11 with positive focal power and convex front and rear surfaces, and a twelfth lens L12 with negative focal power and concave front and rear surfaces, wherein the eleventh lens L11 with positive focal power and the twelfth lens L12 with negative focal power are cemented together.

[0056] The focusing lens group G4 includes: a thirteenth lens L13 with positive focal power and convex front and rear surfaces, and a fourteenth lens L14 with negative focal power and concave front surface and convex rear surface, wherein: the thirteenth lens L13 with positive focal power is a double-sided aspherical structure.

[0057] The rear zoom lens group G5 includes: a fifteenth lens L15 with negative power whose front and rear surfaces are both concave, a sixteenth lens L16 with positive power whose front surface is concave and whose rear surface is convex, and a seventeenth lens L17 with positive power whose front surface is concave and whose rear surface is convex, wherein the sixteenth lens with positive power is a double-sided aspherical structure.

[0058] The aperture stop STP will be enlarged or reduced accordingly with the change in lens magnification.

[0059] Table 1 shows the basic optical parameters of the zoom lens of Example 1.

[0060] Lens parameters W M T f 16.50 100.00 275.00 Fno 1.58 3.84 5.24 Y 20.40 20.40 20.40

[0061] Table 2 shows the structural data of the zoom lens of Example 1.

[0062]

[0063]

[0064] Table 3 shows the zoom data of the zoom lens of Example 1.

[0065] Surface serial number W M T s7 0.91 32.83 37.10 s14 31.63 12.22 1.02 s22 9.08 5.16 27.63 s26 1.32 8.92 1.64 s32 27.50 11.36 3.10

[0066] Table 4 shows the aspherical coefficients of the zoom lens of Example 1.

[0067]

[0068]

[0069] The high-definition zoom optical system in Example 1 further satisfies the following structural features:

[0070] Nd s5l1 =2.00;

[0071] Example 2

[0072] like Figure 4 As shown, the difference between the high-definition zoom optical system of this embodiment and that of Embodiment 1 is that, in this embodiment:

[0073] The front zoom lens group G2 includes: two lenses with negative optical power, namely, a fifth lens G5 and a sixth lens G6, and one lens with negative optical power, namely, a seventh lens L7, and the seventh lens L7 has a double-sided aspherical structure.

[0074] The medium zoom lens group G3 includes: two lenses with positive power, namely, an eighth lens L8 and a ninth lens L9, a lens with negative power, namely, a tenth lens L10, and a cemented lens consisting of a lens with positive power and a lens with negative power, namely, an eleventh lens L11 and a twelfth lens L12, wherein: the ninth lens L9 with positive power and the tenth lens L10 with negative power are cemented together, and the eleventh lens L11 with positive power and the twelfth lens L12 with negative power are cemented together.

[0075] The eighth lens L8 is a lens with convex front and rear surfaces, the ninth lens L9 is a lens with convex front and rear surfaces, the tenth lens L10 is a lens with concave front and rear surfaces, the eleventh lens L11 is a lens with a convex front surface and a concave rear surface, and the twelfth lens L12 is a lens with a convex front surface and a concave rear surface.

[0076] The sixteenth lens L16 in the rear zoom lens group G5 is a lens having convex front and rear surfaces.

[0077] Table 5 shows the basic optical parameters of the zoom lens of Example 2.

[0078] Lens parameters W M T f 17.00 125.00 300.00 Fno 1.76 3.97 5.04 Y 20.40 20.40 20.40

[0079] Table 6 shows the structural data of the zoom lens of Example 2.

[0080]

[0081]

[0082]

[0083] Table 7 shows the zoom data of the zoom lens of Example 2.

[0084] Surface serial number W M T s7 0.70 35.30 42.90 s13 39.07 10.94 1.31 s22 4.25 5.91 24.59 s26 1.41 14.29 2.19 s30 28.64 7.64 3.10

[0085] Table 8 shows the aspherical coefficients of the zoom lens of Example 2.

[0086] Surface serial number K A4 A6 A8 A10 s12 2.19E-01 -2.59E-05 3.72E-08 5.09E-09 -1.07E-10 s13 -9.90E+01 -2.73E-05 1.24E-08 5.91E-09 -1.17E-10 s23 1.21E+00 -2.38E-05 1.03E-07 -3.87E-09 5.65E-11 s24 -4.90E-01 8.07E-06 3.96E-08 -9.94E-10 2.56E-12 s29 9.90E+01 -1.79E-05 3.85E-08 -1.99E-10 -1.08E-12 s30 3.20E-01 -7.49E-06 -3.71E-09 -1.62E-10 -6.45E-13

[0087] The high-definition zoom optical system in Embodiment 2 further satisfies the following structural features:

[0088] Nd s5l1 =2.00;

[0089] Example 3

[0090] like Figure 7As shown, the difference between the high-definition zoom optical system of this embodiment and that of Embodiment 1 is that, in this embodiment:

[0091] The first lens L1 in the fixed lens group G1 is a lens with a convex front surface and a concave rear surface and has negative power, the second lens L2 is a lens with a convex front and rear surfaces and has positive power, and the first lens L1 and the second lens L2 are cemented together.

[0092] The medium zoom lens group G3 includes: a lens with positive power, i.e., a ninth lens L9, a cemented lens consisting of a lens with positive power and a lens with negative power, i.e., a tenth lens L10 and an eleventh lens L11, a lens with positive power, i.e., a twelfth lens L12, and a lens with negative power, i.e., a thirteenth lens L13.

[0093] The ninth lens L9 is a lens with positive power and convex front and rear surfaces, the tenth lens L10 is a lens with positive power and convex front and rear surfaces, the eleventh lens L11 is a lens with positive power and concave front surface and convex rear surface, the twelfth lens is a lens with positive power and convex front and rear surfaces, and the thirteenth lens L13 is a lens with negative power and concave front and rear surfaces.

[0094] The focusing lens group G4 includes a cemented lens consisting of a lens with negative refractive power and a lens with positive refractive power, namely, a fourteenth lens L14 and a fifteenth lens L15.

[0095] The fourteenth lens L14 is an aspheric lens with a convex front surface and a concave rear surface.

[0096] The fifteenth lens L15 is an aspheric lens with convex front and rear surfaces.

[0097] The rear zoom lens group G5 includes a lens having negative refractive power, ie, a sixteenth lens L16, a lens having positive refractive power, ie, a seventeenth lens L17, and a lens having positive refractive power, ie, an eighteenth lens L18.

[0098] The sixteenth lens L16 is a double-sided aspheric lens with concave front and rear surfaces.

[0099] The seventeenth lens L17 is a lens with convex front and rear surfaces.

[0100] The eighteenth lens L18 is a lens with a concave front surface and a convex rear surface.

[0101] Table 9 shows the basic optical parameters of the zoom lens of Example 3.

[0102] Lens parameters W M T f 15.00 110.00 300.00 Fno 1.79 4.04 5.90 Y 20.40 20.40 20.40

[0103] Table 10 shows the structural data of the zoom lens of Example 3.

[0104]

[0105]

[0106] Table 11 shows the zoom data of the zoom lens of Example 3.

[0107]

[0108]

[0109] Table 12 shows the aspherical coefficients of the zoom lens of Example 3.

[0110] Surface serial number K A4 A6 A8 A10 s13 3.79E+01 -1.77E+01 1.57E+00 9.74E+01 2.28E-02 s14 -2.79E-05 -2.01E-05 -1.94E-05 -1.79E-05 -7.90E-06 s27 3.32E-09 -1.57E-08 1.02E-07 4.36E-08 1.49E-09 s30 6.40E-09 6.37E-09 -3.78E-09 -8.06E-11 4.85E-11 s31 -1.12E-10 -1.14E-10 5.97E-11 -6.99E-13 -7.91E-13

[0111] The high-definition zoom optical system in Embodiment 3 further satisfies the following structural features:

[0112] Nd s5l1 =1.90;

[0113] 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. A miniaturized, large-surface, high-definition zoom optical system, characterized in that: The lens system includes, from the object side to the image side, a fixed lens group with positive optical power, a front zoom lens group with negative optical power, an aperture stop, a middle zoom lens group with positive optical power, a focusing lens group with positive optical power, a rear zoom lens group with positive optical power, and an imaging surface, wherein the front zoom lens group moves from the object side to the image side along the optical axis as a whole, while the middle zoom lens group moves from the image side to the object side along the optical axis, and the rear zoom lens group moves from the object side to the image side along the optical axis, so as to achieve a zoom from the wide-angle end to the telephoto end, and by moving the focusing lens group along the optical axis, the defocus caused by the zoom process and the change in object distance is corrected; The overall structure of the high-definition zoom optical system further satisfies: Where: f t is the focal length of the lens at the telephoto end, TTL is the total optical length of the lens, Y is the imaging circle diameter of the lens, FOV w FOV is the maximum field of view of the lens at the wide-angle end. t is the maximum field of view of the lens at the telephoto end; The aperture diaphragm changes with the lens magnification, and the aperture of the aperture diaphragm will cooperate with the lens to enlarge or reduce; The fixed lens group has an overall structure that further satisfies the following conditions simultaneously: a) in: is the effective diameter of the rear surface of the lens group, Fno t is the aperture diameter of the lens at the telephoto end, L S1R-IMG It is the distance from the rear surface of the last lens in the fixed lens group to the imaging surface; b) Where: Vd s1m is the Abbe number of the lens with negative focal power in the cemented lens, Vd s1p is the Abbe number of the lens with positive focal power in the cemented lens, Nd s1m is the refractive index of the lens with negative focal power in the cemented lens, Nd s1p is the refractive index of the lens with positive power in the cemented lens; a) Where: f t is the focal length of the lens at the telephoto end, f w is the focal length of the lens at the wide-angle end, L t-w It is the distance that the front zoom lens group moves when changing from the telephoto end to the wide-angle end; b) Where: f s2l1 is the focal length of the first lens in the front zoom lens group, f s2l2 / 3 is the sum of the focal lengths of the second and third lenses in the front zoom lens group, f s2l4 is the focal length of the fourth lens in the front zoom lens group. If there is no fourth lens in the structure, the value is 0; c) Where: Vd s2m Vd is the Abbe number of the second lens with negative focal power in the front zoom lens group. s2p is the Abbe number of the lens with positive focal power in the front zoom lens group, Nd s2m Nd is the refractive index of the second lens with negative power in the front zoom lens group. s2p is the refractive index of the lens with positive power in the front zoom lens group; The overall structure of the medium zoom lens group further satisfies the following conditions simultaneously: a) in: Fno is the effective diameter of the front surface of the first lens in the medium zoom lens group. w is the aperture diameter of the overall lens at the wide-angle end, L S3F-STP is the distance from the front surface of the first lens of the medium zoom lens group to the aperture stop STP; b) Where: V ds3l1 is the refractive index of the first lens in the medium zoom lens group, f s3l1 is the focal length of the first lens in the medium zoom lens group, V ds3l2 is the refractive index of the second lens in the medium zoom lens group, f s3l2 is the focal length of the second lens in the medium zoom lens group; The overall structure of the focusing lens group further satisfies: in: is the effective diameter of the front surface of the first lens of the focusing lens group, f S4 is the overall focal length of the focusing lens group; The overall structure of the rear zoom lens group further satisfies the following conditions simultaneously: a) Where: Y is the imaging circle diameter of the lens, f S5 is the overall focal length of the rear zoom lens group; b)Nd s5l1 >1.90, where: Nds5l1 is the refractive index of the first lens in the rear zoom lens group; c) Among them: fs5p is the overall focal length of the lenses with positive optical power in the rear zoom lens group, and fs5m is the focal length of the lenses with negative optical power in the rear zoom lens group.

2. The high-definition zoom optical system according to claim 1, characterized in that: The fixed lens group includes: a cemented lens composed of a lens with negative optical focal length and a lens with positive optical focal length, and at least two lenses with positive optical focal length, wherein: the cemented lens ensures the extension of the focal length of the telephoto end and the stability of the light trend, and the lens with positive optical focal length uses anomalous dispersion glass to converge the infrared chromatic aberration at the telephoto end.

3. The high-definition zoom optical system according to claim 1, characterized in that: The front zoom lens group comprises: two lenses with negative optical power and one lens with positive optical power, wherein the two lenses with negative optical power are one lens with a convex front surface and a concave rear surface and one lens with both front and rear surfaces concave.

4. The high-definition zoom optical system according to claim 3, characterized in that: A lens with negative focal power is further arranged behind the lens with positive focal power in the front zoom lens group to improve the zoom ratio of the lens; the lenses in the front zoom lens group all adopt aspherical shapes, thereby improving the coma aberration of the telephoto end of the lens.

5. The high-definition zoom optical system according to claim 1, characterized in that: The medium zoom lens group includes: at least two lenses with positive focal power and a cemented lens composed of a lens with positive focal power and a lens with negative focal power; the lenses with positive focal power use anomalous dispersion glass to converge various chromatic aberrations at the wide-angle end, and further use aspherical mirrors to improve the coma aberration of the lens at the wide-angle end.

6. The high-definition zoom optical system according to claim 1, characterized in that: The focusing lens group includes: a lens with positive optical power and a lens with negative optical power, and the lens with positive optical power uses an aspherical surface to improve the coma of the wide-angle end of the lens; the rear zoom lens group includes: a lens with negative optical power and at least one lens with positive optical power, thereby effectively improving the effective imaging circle diameter of the lens and further converging the light to form an image, wherein: the lens with negative optical power is a lens with concave front and rear surfaces.

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