High-definition zoom lens and security camera device

Abstract

The present invention discloses a high-definition zoom lens and a security camera device, and relates to the field of optical technology. The present invention comprises, from the object side to the image side, a first fixed lens group with positive focal length, a zoom lens group with negative focal length, an aperture, a second fixed lens group with positive focal length, a focusing lens group with negative focal length, and a third fixed lens group with positive focal length; the movement amount of the zoom lens group satisfies the following conditional formula: ΔB1 / TTL∈(0.15, 0.35); wherein: ΔB1 is the relative displacement of the zoom lens group at the wide-angle end position and the telephoto end position, and TTL is the total length of the high-definition zoom lens; the focusing lens group moves along the optical axis direction to compensate for the moving zoom lens group. The relative displacement of the zoom lens group of the present invention is also relatively large, that is, the zoom range of the high-definition zoom lens is relatively large, and the application range of the high-definition zoom lens is relatively wide.

Description

Technical Field

[0001] The present invention relates to the field of optical technology, and in particular to a high-definition zoom lens and a security camera device. Background Art

[0002] In response to the national action plan for the development of the ultra-high-definition video industry, the security industry will fully enter the ultra-high-definition era in the future in accordance with the overall technical route of "4K first, taking 8K into consideration". In this context, there is a gap in the high-end large-magnification zoom field of traditional security lenses.

[0003] Previous security lenses, while meeting the requirements of large zoom ratios, were often unable to achieve true 4K resolution due to various reasons, such as the diffraction limit at the telephoto end and the lens group structure. The existing true 4K resolution products often remain in the small zoom ratio range. Summary of the invention

[0004] The present invention will solve the existing technical problems and provide a high-definition zoom lens and a security camera device. The relative displacement range of the zoom lens group is also large, that is, the zoom range of the high-definition zoom lens is large and the application range of the high-definition zoom lens is wide.

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

[0006] A high-definition zoom lens comprises, from the object side to the image side, a first fixed lens group with positive focal length, a variable power lens group with negative focal length, an aperture, a second fixed lens group with positive focal length, a focusing lens group with negative focal length, and a third fixed lens group with positive focal length; the movement amount of the variable power lens group satisfies the following conditional formula: ΔB1 / TTL∈(0.15, 0.35); wherein: ΔB1 is the relative displacement of the variable power lens group at the wide-angle end position and the telephoto end position, and TTL is the total length of the high-definition zoom lens; the focusing lens group moves along the optical axis direction to compensate for the movement of the variable power lens group.

[0007] Preferably, the movement amount of the focusing lens group satisfies the following conditional formula: ΔB2 / ΔB1∈(0.15, 0.4); wherein: ΔB2 is the relative displacement of the focusing lens group when one end is located close to the object plane and the other end is located close to the image plane.

[0008] Preferably, the number of lenses in the second fixed lens group is greater than the number of lenses in the first fixed lens group and the number of lenses in the third fixed lens group.

[0009] Preferably, the difference between the number of lenses in the first fixed lens group and the number of lenses in the third fixed lens group is less than or equal to 2.

[0010] Preferably, the number of lenses in the focusing lens group is less than or equal to the number of lenses in the third fixed lens group; and / or the mass of the focusing lens group is less than the mass of the third fixed lens group.

[0011] Preferably, at least one of the three groups of the first fixed lens group, the second fixed lens group and the third fixed lens group includes a cemented lens.

[0012] Preferably, there is at most one aspherical lens in the second fixed lens group.

[0013] Preferably, the third fixed lens group includes at least a lens with positive optical power and a lens with negative optical power from the object plane side to the image plane side.

[0014] Preferably, the first fixed lens group includes at least two lenses with positive optical power and one lens with negative optical power.

[0015] One of the purposes of the present invention is to provide a security camera device, which includes a high-definition zoom lens.

[0016] Compared with the prior art, the high-definition zoom lens and security camera device provided by the present invention have the following beneficial effects:

[0017] 1. The clarity of the zoom lens is increased by the five-group structure with positive, negative, positive, negative and positive optical focal lengths; at the same time, the movement range of the zoom lens group is large, the imaging quality of the HD zoom lens is high, and the performance is relatively stable; and the relative displacement range of the zoom lens group is also large, that is, the zoom range of the HD zoom lens is large, and the application range of the HD zoom lens is wide.

[0018] 2. The movement of the focusing lens group is small, so the performance of the remaining lens groups is relatively stable, and the overall volume of the high-definition zoom lens can be reduced, realizing the miniaturization of the lens.

[0019] 3. By setting up two positive lenses and one negative lens, each lens can form the positive optical power of the first fixed lens group without selecting abnormal optical power parameters. Therefore, the curvature radius of each lens is increased, which facilitates the processing of the lenses in the first fixed lens group and reduces the processing cost of the first fixed lens group. At the same time, the curvature radius of the first fixed lens group is larger, which also reduces the thickness of each lens, thereby reducing the thickness of the first fixed lens group, which is conducive to miniaturization of the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The preferred implementation scheme will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of a high-definition zoom lens and a security camera device.

[0021] Figure 1 It is a structural schematic diagram of a high-definition zoom lens of the present invention;

[0022] Figure 2 It is a coma diagram of a high-definition zoom lens in a telephoto state of the present invention;

[0023] Figure 3 It is a diagram of various aberrations of a high-definition zoom lens in a telephoto state of the present invention;

[0024] Figure 4 It is a coma diagram of a high-definition zoom lens in a wide-angle state of the present invention;

[0025] Figure 5 It is a diagram of various aberrations of a high-definition zoom lens in a wide-angle state of the present invention;

[0026] Figure 6 It is a structural schematic diagram of another high-definition zoom lens of the present invention;

[0027] Figure 7 It is another coma diagram of the high-definition zoom lens in the telephoto state of the present invention;

[0028] Figure 8 is a diagram of various aberrations of another high-definition zoom lens in a telephoto state of the present invention;

[0029] Fig. 9 It is another coma diagram of the high-definition zoom lens in the wide-angle state of the present invention;

[0030] Fig.10 is a diagram of various aberrations of another high-definition zoom lens in a wide-angle state of the present invention;

[0031] Fig.11 It is a structural schematic diagram of another high-definition zoom lens of the present invention;

[0032] Fig.12 It is another coma diagram of the high-definition zoom lens in the telephoto state of the present invention;

[0033] Fig.13 1 is a diagram of various aberrations of another high-definition zoom lens in a telephoto state of the present invention;

[0034] Fig.14 It is a coma diagram of another high-definition zoom lens in wide-angle state of the present invention;

[0035] Fig.15 This is a diagram of various aberrations of another high-definition zoom lens in wide-angle state of the present invention.

[0036] Description of the accompanying drawings: G1, first fixed lens group; G2, variable power lens group; STP, aperture; G3, second fixed lens group; G4, focusing lens group; G5, third fixed lens group; G6, auxiliary component. DETAILED DESCRIPTION

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0038] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0039] Embodiment 1: Figure 1 As shown, a high-definition zoom lens includes, from the object side to the image side, the following:

[0040] A first fixed lens group G1 with positive power, a zoom lens group G2 with negative power, an aperture STP, a second fixed lens group G3 with positive power, a focusing lens group G4 with negative power, and a third fixed lens group G5 with positive power;

[0041] The movement amount of the zoom lens group G2 satisfies the following conditional expression:

[0042] ΔB1 / TTL∈(0.15, 0.35)……(1);

[0043] Wherein: ΔB1 is the relative displacement of the zoom lens group G2 at the wide-angle end position and the telephoto end position, and TTL is the total length of the high-definition zoom lens.

[0044] The focusing lens group G4 moves along the optical axis to compensate for the moving zoom lens group G2.

[0045] In the present embodiment, the clarity of the zoom lens is increased by adopting a five-group structure with optical focal lengths of positive, negative, positive, negative and positive respectively; at the same time, the movement range of the zoom lens group G2 is larger, the imaging quality of the high-definition zoom lens is higher, and the performance is relatively stable; and the relative displacement range of the zoom lens group G2 is also larger, that is, the zoom range of the high-definition zoom lens is larger, and the application range of the high-definition zoom lens is wider.

[0046] Specifically, the movement amount of the focusing lens group G4 satisfies the following conditional expression:

[0047] ΔB2 / ΔB1∈(0.15, 0.4)……(2);

[0048] Wherein: ΔB2 is the relative displacement of the focusing lens group G4 when the end thereof is located close to the object plane and the end thereof is located close to the image plane.

[0049] Since the movement of the focusing lens group G4 is small, the performance of the remaining lens groups is relatively stable, and the overall volume of the high-definition zoom lens can be reduced, thereby achieving miniaturization of the lens.

[0050] Preferably, the three groups of the first fixed lens group G1, the second fixed lens group G3 and the third fixed lens group G5 include at least one cemented lens. In this embodiment, the provision of the cemented lens is conducive to miniaturization of the lens, and at the same time, it can also facilitate the correction of chromatic aberration and spherical aberration of imaging.

[0051] There is at most one aspheric lens in the second fixed lens group G3; specifically, for a lens with a simpler optical path, a single aspheric lens in the original lens group can be directly replaced by two or three aspheric lenses, thereby reducing the processing cost of the lens; and for a lens with a more complex optical path, by retaining one aspheric lens, a good light adjustment effect can still be maintained, and the processing cost of the second fixed group is relatively low.

[0052] By replacing the aspherical lens in the original lens group with a spherical lens, the same technical effect is achieved, the processing cost of the second fixed lens group G3 is effectively reduced, and the production efficiency of the lens is increased.

[0053] According to the improvement of the above embodiment, in this embodiment, the third fixed lens group G5 includes at least a lens with positive optical power and a lens with negative optical power from the object plane side to the image plane side.

[0054] The lens with positive optical focal length in the third fixed lens group G5 can be close to the focusing lens group G4 with negative optical focal length to correct the chromatic aberration and spherical aberration of the light of the focusing lens group G4, and the lens with negative optical focal length in the third fixed lens group G5 can be set on the side close to the image plane to correct the chromatic aberration and spherical aberration of the light; and the focusing lens group G4, the lens with positive optical focal length and the lens with negative optical focal length form a positive-negative-positive structure, and the chromatic aberration and spherical aberration performance of the imaging are better.

[0055] According to the improvement of the above embodiment, in this embodiment, the first fixed lens group G1 includes at least two lenses with positive optical power and one lens with negative optical power.

[0056] In this embodiment, by setting two positive lenses and one negative lens, each lens can form the positive optical power of the first fixed lens group G1 without selecting abnormal optical power parameters. Therefore, the curvature radius of each lens is increased, which facilitates the processing of the lens in the first fixed lens group G1 and reduces the processing cost of the first fixed lens group G1. At the same time, the curvature radius of the first fixed lens group G1 is relatively large, which also reduces the thickness of each lens, thereby reducing the thickness of the first fixed lens group G1, which is conducive to miniaturization of the lens.

[0057] Specifically, in this embodiment, the total optical length of the high-definition zoom lens is TTL=60-100 mm, FNO=1.2-1.8, and the field of view FOV=8-60 degrees; the zoom ratio is five times, and preferably, the focal length F=10-50 mm.

[0058] Embodiment 2: Figure 1 As shown, a high-definition zoom lens is shown. The difference between this embodiment and the first embodiment lies in the quantity relationship of lenses in each lens group.

[0059] On the basis of the first embodiment, the number of lenses in the second fixed lens group G3 is greater than the number of lenses in the first fixed lens group G1 and the number of lenses in the third fixed lens group G5.

[0060] When the number of lenses in the second fixed lens group G3 is large, the volume of the second fixed lens group G3 is also increased accordingly, and the overall center of gravity of the lens can also be located in the second fixed lens group G3, thereby increasing the stability of the lens; at the same time, since the second fixed lens group G3 can adjust the parameters in both the wide-angle end and the telephoto end states at the same time, and the adjustment efficiency is relatively high, therefore, by increasing the number of the second fixed lens group G3, the design difficulty of the remaining lens groups is reduced, and the design cost of the lens is reduced.

[0061] Preferably, the difference between the number of lenses in the first fixed lens group G1 and the number of lenses in the third fixed lens group G5 is less than or equal to 2.

[0062] In this embodiment, by reducing the number of lenses in the first fixed lens group G1 and the number of lenses in the third fixed lens group G5, the possibility of lens center of gravity shift is reduced and the stability of the lens is increased; at the same time, lens groups with similar numbers can jointly correct the chromatic aberration and spherical aberration of the imaging, reducing the difficulty of lens design.

[0063] Preferably, the number of lenses in the focusing lens group G4 is less than or equal to the number of lenses in the third fixed lens group G5; and / or the mass of the focusing lens group G4 is less than the mass of the third fixed lens group G5.

[0064] When the number and / or mass of the focusing lens group G4 is small, the possibility of the center of gravity of the entire lens changing is reduced, and the stability of the lens is increased.

[0065] Embodiment 3: Figure 1 As shown, a high-definition zoom lens includes, from the object side to the image side, the following:

[0066] A first fixed lens group G1 with positive optical power, a zoom lens group G2 with negative optical power, an aperture STP, a second fixed lens group G3 with positive optical power, a focusing lens group G4 with negative optical power, a third fixed lens group G5 with positive optical power, and an auxiliary component G6.

[0067] The first fixed lens group G1 includes: a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, and a third lens L3 with positive refractive power; the first lens L1 and the second lens L2 are cemented together.

[0068] The zoom lens group G2 includes: a fourth lens L4 with negative power, a fifth lens L5 with negative power, a sixth lens L6 with positive power, and a seventh lens L7 with negative power; the fifth lens L5 and the sixth lens L6 are cemented together.

[0069] The second fixed lens group G3 includes: an eighth lens L8 with positive power, a ninth lens L9 with positive power, a tenth lens L10 with negative power, an eleventh lens L11 with positive power, a twelfth lens L12 with negative power, a thirteenth lens L13 with positive power, a fourteenth lens L14 with negative power, and a fifteenth lens L15 with positive power; the tenth lens L10 and the eleventh lens L11 are cemented together, and the fourteenth lens L14 and the fifteenth lens L15 are cemented together.

[0070] The focusing lens group G4 is a sixteenth lens L16 having negative refractive power.

[0071] The third fixed lens group G5 is a seventeenth lens L17 of positive refractive power.

[0072] The auxiliary component G6 is the protective glass L18.

[0073] Table 1 shows basic lens data of the high definition zoom lens of this embodiment, Table 2 shows variable parameters in Table 1, and Table 3 shows aspherical coefficients.

[0074] The surface number column shows the surface number when the surface on the object side is set as the first surface and the numbers are increased one by one toward the image side; the surface type column shows the surface type of a certain lens; the curvature radius column shows the curvature radius of a certain lens, and when the curvature radius is positive, it indicates that the surface is curved toward the object side, and when the curvature radius is negative, it indicates that the surface is curved toward the image side; the center thickness column shows the surface spacing on the optical axis between each surface and the surface adjacent to its image side; the refractive index column shows the refractive index of a certain lens; and the Abbe number column shows the Abbe number of a certain lens.

[0075] In Table 2, the WIDE column indicates specific values ​​of various variable parameters when the high-definition zoom lens is in the wide-angle end state, and the TELE column indicates specific values ​​of various variable parameters when the high-definition zoom lens is in the telephoto end state.

[0076] In Table 3, K is the cone coefficient, and e is the scientific notation, for example, e-005 represents 10-5.

[0077]

Table 1

[0078]

[0079]

[0080]

Table 2

[0081] WIDE TELE D1 1 20 D2 20.9 1.9 D3 0.54 7.1 D4 8.0 1.44

[0082]

Table 3

[0083] 14 15 Quadratic surface constant (K) -1.19856632 -112.89286764 4th order coefficient (A) -5.67e-007 1.06e-005 6th order coefficient (B) 1.15e-007 6.81e-008 8th order coefficient (C) -5.68e-010 7.59e-010 10th order coefficient (D) 3.75e-012 -8.75e-012

[0084] In this embodiment, the focal length of the high-definition zoom lens is F=10-50 mm, FNO=1.5-1.7, the field of view FOV=10-50 degrees, and TTL=90 mm.

[0085] ΔB1=19mm, ΔB2=6.56mm, ΔB1 / TTL=0.21, ΔB2 / ΔB1=0.35.

[0086] Combination Figure 2 and Figure 4 As shown, the axial chromatic aberration of the three colors of RGB of the lens is well corrected at each zoom position, which can achieve clear imaging. The chromatic aberration in the infrared band is also within an acceptable range, which can achieve infrared imaging; the clarity of the image is always guaranteed during the zoom process.

[0087] like Figure 3 and Figure 5As shown, this embodiment makes good corrections to the magnification chromatic aberration and coma of the RGB three colors, so that the imaged picture will not have obvious purple or red edges or the picture will not be blurred, thus meeting the requirements of ultra-high image quality.

[0088] Embodiment 4: Figure 6 As shown, a high-definition zoom lens includes, from the object side to the image side, the following:

[0089] A first fixed lens group G1 with positive optical power, a zoom lens group G2 with negative optical power, an aperture STP, a second fixed lens group G3 with positive optical power, a focusing lens group G4 with negative optical power, a third fixed lens group G5 with positive optical power, and an auxiliary component G6.

[0090] The first fixed lens group G1 includes: a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, and a third lens L3 with positive refractive power; the first lens L1 and the second lens L2 are cemented together.

[0091] The zoom lens group G2 includes: a fourth lens L4 with negative power, a fifth lens L5 with negative power, a sixth lens L6 with positive power, and a seventh lens L7 with negative power; the fifth lens L5 and the sixth lens L6 are cemented together.

[0092] The second fixed lens group G3 includes: an eighth lens L8 with positive power, a ninth lens L9 with positive power, a tenth lens L10 with negative power, an eleventh lens L11 with positive power, a twelfth lens L12 with negative power, a thirteenth lens L13 with positive power, and a fourteenth lens L14 with positive power; the tenth lens L10 and the eleventh lens L11 are cemented together.

[0093] The focusing lens group G4 is a fifteenth lens L15 having negative refractive power.

[0094] The third fixed lens group G5 includes a sixteenth lens L16 with positive refractive power and a seventeenth lens L17 with negative refractive power.

[0095] The auxiliary component G6 is the protective glass L18.

[0096] Table 4 shows basic lens data of the high definition zoom lens of this embodiment, Table 5 shows variable parameters in Table 4, and Table 6 shows aspherical coefficients.

[0097] The surface number column shows the surface number when the surface on the object side is set as the first surface and the numbers are increased one by one toward the image side; the surface type column shows the surface type of a certain lens; the curvature radius column shows the curvature radius of a certain lens, and when the curvature radius is positive, it indicates that the surface is curved toward the object side, and when the curvature radius is negative, it indicates that the surface is curved toward the image side; the center thickness column shows the surface spacing on the optical axis between each surface and the surface adjacent to its image side; the refractive index column shows the refractive index of a certain lens; and the Abbe number column shows the Abbe number of a certain lens.

[0098] In Table 5, the WIDE column indicates specific values ​​of various variable parameters when the high-definition zoom lens is in the wide-angle end state, and the TELE column indicates specific values ​​of various variable parameters when the high-definition zoom lens is in the telephoto end state.

[0099] In Table 6, K is the cone coefficient, and e is the scientific notation, for example, e-005 represents 10-5.

[0100]

Table 4

[0101]

[0102]

[0103]

Table 5

[0104] WIDE TELE D1 0.7 14.8 D2 15.2 1.1 D3 0.6 4.15 D4 6.89 3.34

[0105]

Table 6

[0106]

[0107]

[0108] In this embodiment, the focal length of the high-definition zoom lens is F=10-50 mm, FNO=1.4-1.6, the field of view FOV=8-50 degrees, and TTL=80 mm.

[0109] ΔB1=14.1mm, ΔB2=3.55mm, ΔB1 / TTL=0.18, ΔB2 / ΔB1=0.25.

[0110] Combination Figures 7 to 10 As shown in the figure, the axial chromatic aberration of the three colors of RGB of this lens is well corrected at each zoom position, which can achieve clear imaging. The chromatic aberration of the infrared band is also within an acceptable range, which can achieve infrared imaging. The image clarity is always guaranteed during the zoom process. Figure 3It is a spherical aberration diagram at three zoom positions. As shown in the figure, this embodiment makes good corrections to the magnification chromatic aberration and coma of the RGB three colors, so that the imaging picture will not have obvious purple and red edges or the picture will be blurred, meeting the requirements of ultra-high image quality.

[0111] Combination Figure 7 and Fig. 9 As shown, the axial chromatic aberration of the three colors of RGB of the lens is well corrected at each zoom position, which can achieve clear imaging. The chromatic aberration in the infrared band is also within an acceptable range, which can achieve infrared imaging; the clarity of the image is always guaranteed during the zoom process.

[0112] like Figure 8 and Fig.10 As shown, this embodiment makes good corrections to the magnification chromatic aberration and coma of the RGB three colors, so that the imaged picture will not have obvious purple or red edges or the picture will not be blurred, thus meeting the requirements of ultra-high image quality.

[0113] The axial chromatic aberration of the three colors of RGB has been better converged, and the clarity of the picture has been improved. At the same time, the F number of the lens has been increased, making it perform better in low-light conditions.

[0114] Embodiment 5: Fig.11 As shown, a high-definition zoom lens includes, from the object side to the image side, the following:

[0115] A first fixed lens group G1 with positive optical power, a zoom lens group G2 with negative optical power, an aperture STP, a second fixed lens group G3 with positive optical power, a focusing lens group G4 with negative optical power, a third fixed lens group G5 with positive optical power, and an auxiliary component G6.

[0116] The first fixed lens group G1 includes: a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, and a third lens L3 with positive refractive power; the first lens L1 and the second lens L2 are cemented together.

[0117] The zoom lens group G2 includes: a fourth lens L4 with negative power, a fifth lens L5 with negative power, a sixth lens L6 with positive power, and a seventh lens L7 with negative power; the fifth lens L5 and the sixth lens L6 are cemented together.

[0118] The second fixed lens group G3 includes: an eighth lens L8 with positive power, a ninth lens L9 with positive power, a tenth lens L10 with negative power, an eleventh lens L11 with positive power, a twelfth lens L12 with negative power, and a thirteenth lens L13 with positive power; the tenth lens L10 and the eleventh lens L11 are cemented together, and the twelfth lens L12 and the thirteenth lens L13 are cemented together.

[0119] The focusing lens group G4 is a fourteenth lens L14 with negative refractive power.

[0120] The third fixed lens group G5 includes a fifteenth lens L15 having positive refractive power, a sixteenth lens L16 having positive refractive power, and a seventeenth lens L17 having negative refractive power.

[0121] The auxiliary component G6 includes: a filter 18 and a protective glass L19.

[0122] Basic lens data of the high definition zoom lens of this embodiment is shown in Table 7, variable parameters in Table 7 are shown in Table 8, and aspheric coefficients are shown in Table 9.

[0123] The surface number column shows the surface number when the surface on the object side is set as the first surface and the numbers are increased one by one toward the image side; the surface type column shows the surface type of a certain lens; the curvature radius column shows the curvature radius of a certain lens, and when the curvature radius is positive, it indicates that the surface is curved toward the object side, and when the curvature radius is negative, it indicates that the surface is curved toward the image side; the center thickness column shows the surface spacing on the optical axis between each surface and the surface adjacent to its image side; the refractive index column shows the refractive index of a certain lens; and the Abbe number column shows the Abbe number of a certain lens.

[0124] In Table 8, the WIDE column indicates specific values ​​of various variable parameters when the high-definition zoom lens is in the wide-angle end state, and the TELE column indicates specific values ​​of various variable parameters when the high-definition zoom lens is in the telephoto end state.

[0125] In Table 9, K is the cone coefficient, and e is the scientific notation, for example, e-005 represents 10-5.

[0126]

Table 7

[0127]

[0128]

[0129]

Table 8

[0130] WIDE TELE D1 0.2 20.85 D2 21.26 0.61 D3 0.8 4.51 D4 6.51 2.8

[0131]

Table 9

[0132]

[0133]

[0134] In this embodiment, the focal length of the high-definition zoom lens is F=10-50 mm, FNO=1.2-1.5, the field of view FOV=8-49 degrees, and TTL=71 mm.

[0135] ΔB1=20.65mm, ΔB2=3.71mm, ΔB1 / TTL=0.29, ΔB2 / ΔB1=0.18.

[0136] Combination Fig.12 and Fig.14 As shown, the axial chromatic aberration of the three colors of RGB of the lens is well corrected at each zoom position, which can achieve clear imaging. The chromatic aberration in the infrared band is also within an acceptable range, which can achieve infrared imaging; the clarity of the image is always guaranteed during the zoom process.

[0137] like Fig.13 and Fig.15 As shown, this embodiment makes good corrections to the magnification chromatic aberration and coma of the RGB three colors, so that the imaged picture will not have obvious purple or red edges or the picture will not be blurred, thus meeting the requirements of ultra-high image quality.

[0138] The spherical aberration convergence is better, and the clarity of the picture is better improved. At the same time, the F number of the lens is increased, making it perform better in low-light conditions.

[0139] Embodiment 6: A security camera device, on which is installed a high-definition zoom lens as described in any one of the above embodiments.

[0140] It should be noted that the above embodiments can be freely combined as needed. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A high-definition zoom lens, characterized in that: From the object side to the image side, it includes: A first fixed lens group with positive power, a zoom lens group with negative power, an aperture, a second fixed lens group with positive power, a focusing lens group with negative power, and a third fixed lens group with positive power; The movement amount of the zoom lens group satisfies the following conditional formula: ΔB1 / TTL∈(0.15, 0.35); Wherein: ΔB1 is the relative displacement of the zoom lens group at the wide-angle end position and the telephoto end position, and TTL is the total length of the high-definition zoom lens; The focusing lens group moves along the optical axis direction to compensate for the moving zoom lens group; The movement amount of the focusing lens group satisfies the following conditional formula: ΔB2 / ΔB1∈(0.15, 0.4); Wherein: ΔB2 is the relative displacement of the focusing lens group when the end thereof is located close to the object plane and the end thereof is located close to the image plane; The first fixed lens group at least includes: two lenses with positive optical power and one lens with negative optical power; The positive-power lens in the third fixed lens group is close to the negative-power focusing lens group, and is used to correct the chromatic aberration and spherical aberration of the light of the focusing lens group.

2. The high-definition zoom lens according to claim 1, characterized in that: The number of lenses in the second fixed lens group is greater than the number of lenses in the first fixed lens group and the number of lenses in the third fixed lens group.

3. The high-definition zoom lens according to claim 2, characterized in that: A difference between the number of lenses in the first fixed lens group and the number of lenses in the third fixed lens group is less than or equal to 2.

4. The high-definition zoom lens according to claim 2, characterized in that: The number of lenses in the focusing lens group is less than or equal to the number of lenses in the third fixed lens group; and / or The mass of the focusing lens group is smaller than the mass of the third fixed lens group.

5. The high-definition zoom lens according to claim 1, characterized in that: The three groups of the first fixed lens group, the second fixed lens group and the third fixed lens group include at least one cemented lens.

6. The high-definition zoom lens according to claim 1, characterized in that: There is at most one aspherical lens in the second fixed lens group.

7. The high-definition zoom lens according to claim 1, characterized in that: The third fixed lens group includes at least a lens with positive optical power and a lens with negative optical power from the object plane side to the image plane side.

8. A security camera device, characterized in that: The security camera device comprises a high-definition zoom lens as described in any one of claims 1 to 7.

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