Zoom movie lens and camera device

Abstract

The present invention discloses a zoom movie lens and a camera device, and relates to the technical field of lenses. The present invention comprises: a zoom lens group with negative focal length, a fixed lens group with positive focal length, a focusing lens group, a cylindrical lens group and a compensating lens group with positive focal length, which are sequentially arranged from the object side to the image side; when changing the magnification, the interval between the zoom lens group and the focusing lens group, and the interval between the focusing lens group and the cylindrical lens group, are changed by movement in the zoom lens group and / or the focusing lens group; the zoom lens group satisfies the conditional formula (1) expressed as follows: α*M / TTL<2(1); wherein α is a preset lens coefficient, M is a maximum moving distance of the zoom lens group, and TTL is the total optical length of the movie lens. The present invention reduces the possibility of the compensating lens group being too long or too short, thereby reducing the possibility of spherical aberration, peripheral coma and chromatic aberration, and improving the imaging quality of the zoom movie lens.

Description

Technical Field

[0001] The present invention relates to the technical field of lenses, and in particular to a zoom movie lens and a camera device. Background Art

[0002] Cine lenses, as the name implies, are lenses used for filming movies. Cine lenses have top-notch optical quality, and their mechanical design also takes into full consideration the professional needs of filmmaking. Since these lenses are specifically tailored for filming environments, they may not be suitable for other fields. Installing a focus ring and modifying the stepless aperture on a camera lens does not turn it into a cinema lens.

[0003] As materials become less expensive, cameras with large-size photosensitive components continue to emerge, and an industrial structure with fewer lenses and more machines has gradually taken shape. Many lens manufacturers have begun to modify and decorate camera lenses, and put them on the market under the name of movie lenses or "movie-style" lenses.

[0004] In Hollywood long ago, the distinction between the two lenses was very clear. Today, it is a different story, and the line will continue to blur as manufacturers gradually introduce cheaper cinema lenses, sacrificing some key cinema lens characteristics to achieve a lower price.

[0005] During the focusing process of existing movie lenses, the internal lens group will undergo a series of displacements to focus the incident light from a specific distance onto the imaging surface. When shifting the focus between multiple focal points, the displacement of the lens group inside the lens may slightly change the size of the image field, making it look like a slight zoom, reducing the imaging quality of the movie lens. Summary of the invention

[0006] The present invention will solve the existing technical problems and provide a zoom movie lens and a camera device, which reduce the possibility of the compensation lens group being too long or too short, thereby reducing the possibility of spherical aberration, peripheral coma and chromatic aberration, and improving the imaging quality of the zoom movie lens.

[0007] The technical solution provided by the present invention is as follows:

[0008] A zoom movie lens comprises: a zoom lens group with negative optical power, a fixed lens group with positive optical power, a focusing lens group, a cylindrical lens group and a compensating lens group with positive optical power, which are arranged in sequence from the object side to the image side; when changing the magnification, the interval between the zoom lens group and the focusing lens group, and the interval between the focusing lens group and the cylindrical lens group are changed by the movement of the zoom lens group and / or the focusing lens group; the zoom lens group satisfies the conditional formula (1) expressed as follows: α*M / TTL<2(1); wherein α is a preset lens coefficient, M is a maximum moving distance of the zoom lens group, and TTL is the total optical length of the movie lens.

[0009] In the technical solution, by limiting the maximum moving distance of the zoom lens group, the moving range of the zoom lens group is reduced, thereby reducing the change in the field of view angle of the zoom movie lens during movement, reducing the possibility of the breathing effect, and improving the imaging quality of the movie lens.

[0010] Preferably, the zoom lens group and the fixed lens group satisfy the following conditional equation (2): 0.2<α*N / TTL<1.5(2); wherein N is the distance between the zoom lens group and the fixed lens group.

[0011] In the technical solution, by limiting the distance between the zoom lens group and the fixed lens group, the possibility of a sharp drop in the performance of the optical lens due to the distance between the zoom lens group and the fixed lens group being too small is reduced, thereby increasing the reliability of the zoom movie lens; the possibility of an excessive change in the field of view angle due to the distance between the zoom lens group and the fixed lens group being too large is also reduced, thereby reducing the breathing effect of the zoom movie lens and increasing the imaging quality of the zoom movie lens.

[0012] Preferably, when the zoom lens group is located close to the image side, the zoom movie lens is in a wide-angle state; the zoom movie lens in the wide-angle state satisfies the following conditional equation (3): 0.5 <EFL w / BFL<1.5(3); where EFL w is the focal length of the zoom movie lens in the wide-angle state, and BFL is the optical back focus of the zoom movie lens.

[0013] In the present technical solution, by limiting the focal length of the zoom movie lens in the wide-angle state, the optical power of the zoom movie lens is optimized, the possibility of the compensation lens group being too long or too short is reduced, and then the possibility of spherical aberration, peripheral coma and chromatic aberration is reduced, thereby improving the imaging quality of the zoom movie lens.

[0014] Preferably, when the zoom lens group is located close to the image side, the zoom movie lens is in a wide-angle state; the zoom movie lens in the wide-angle state satisfies the following conditional equation (4): 0.8 <F GA / EFL w <1.5(4); where F GA is the focal length of the zoom lens group, EFL w is the focal length of the zoom movie lens in the wide-angle state.

[0015] In the technical solution, by limiting the ratio of the focal length of the zoom lens group to the focal length of the zoom movie lens in the wide-angle state, the focal length of the zoom lens group is optimized, the possibility of the focal length of the zoom lens group being too large or too small is reduced, and then the possibility of the zoom lens group or the remaining lens groups having too low a focal length is reduced, the possibility of the zoom lens group or the remaining lens groups having an increased lens radius is reduced, the total mass of the zoom movie lens is reduced, the focusing process of the zoom movie lens is facilitated, the possibility of spherical aberration, peripheral chromatic aberration and coma aberration is reduced, and the imaging quality of the zoom movie lens is improved.

[0016] Preferably, the zoom lens group includes at least a first lens group and a second lens group having negative optical power, the first lens group is close to the object side, and the second lens group is close to the image side; the zoom lens group satisfies the following conditional equation (5): -1<φ Ga2 / φ Ga1 <1(5); where φ Ga1 is the focal power of the first lens group, φ Ga2 is the optical power of the second lens group.

[0017] In the technical solution, the negative optical power of the zoom lens group is realized by limiting the optical power ratio of the first lens group and the second lens group.

[0018] Preferably, the second lens group is curved toward the image side.

[0019] In this technical solution, by limiting the bending direction of the second lens group, the distortion of the optical path by the zoom lens group is reduced, the possibility of deformation and distortion from the center to the outermost periphery of the picture is reduced, and the imaging quality of the zoom movie lens is improved.

[0020] Preferably, at least one aspherical lens is provided in the first lens group and / or the second lens group.

[0021] In this technical solution, by using an aspherical lens, the resolution of the zoom movie lens is increased, the possibility of matching with a high-resolution camera is increased, the quality of the zoom movie lens is reduced, and the user experience is improved.

[0022] Preferably, the focusing lens group includes at least two focusing lens groups; when changing the magnification, the distance between the focusing lens group and the fixed lens group and the distance between two adjacent focusing lens groups change with the movement of the zoom lens group.

[0023] In this technical solution, by setting up multiple focusing lens groups, the focusing ability of the focusing lens group GC is further increased, the possibility of spherical aberration, peripheral chromatic aberration and coma aberration is reduced, and the imaging quality of the zoom movie lens is improved.

[0024] Preferably, the fixed lens group includes at least two fixed lens groups, and a movable lens group is provided between the two fixed lens groups; the moving direction of the movable lens group is opposite to the moving direction of the zoom lens group.

[0025] In the technical solution, by setting up a mobile lens group that moves in the opposite direction within a fixed lens group, the focusing ability of the light path in the focusing lens group is optimized, the possibility of spherical aberration, peripheral chromatic aberration and coma is reduced, and the imaging quality of the zoom movie lens is improved.

[0026] Preferably, the cylindrical lens group includes at least one cemented cylindrical lens group.

[0027] In the technical solution, by setting up a cemented cylindrical lens group, the resolution of the lens is increased, the possibility of spherical aberration, peripheral chromatic aberration and coma is reduced, and the imaging quality of the zoom movie lens is improved.

[0028] Another object of the present invention is to provide a camera device having a zoom movie lens.

[0029] Compared with the prior art, the zoom movie lens and camera device provided by the present invention have the following beneficial effects:

[0030] 1. By limiting the maximum moving distance of the zoom lens group, the moving range of the zoom lens group is reduced, thereby reducing the change in the field of view angle of the zoom movie lens during movement, reducing the possibility of the breathing effect, and improving the imaging quality of the movie lens.

[0031] 2. By limiting the distance between the zoom lens group and the fixed lens group, the possibility of a sharp drop in the performance of the optical lens due to the small distance between the zoom lens group and the fixed lens group is reduced, thereby increasing the reliability of the zoom movie lens; the possibility of excessive changes in the field of view angle due to the large distance between the zoom lens group and the fixed lens group is also reduced, thereby reducing the breathing effect of the zoom movie lens and increasing the imaging quality of the zoom movie lens.

[0032] 3. By limiting the focal length of the zoom movie lens in the wide-angle state, the optical power of the zoom movie lens is optimized, reducing the possibility of the compensation lens group being too long or too short, thereby reducing the possibility of spherical aberration, peripheral coma and chromatic aberration, and improving the imaging quality of the zoom movie lens.

[0033] 4. By limiting the ratio of the focal length of the zoom lens group to the focal length of the wide-angle state of the zoom movie lens, the focal length of the zoom lens group is optimized, and the possibility of the focal length of the zoom lens group being too large or too small is reduced, thereby reducing the possibility of the zoom lens group or the remaining lens groups having too low a focal length, reducing the possibility of the zoom lens group or the remaining lens groups having an increase in the radius of the lens, reducing the overall mass of the zoom movie lens, facilitating the focusing process of the zoom movie lens, reducing the possibility of spherical aberration, peripheral chromatic aberration and coma, and improving the imaging quality of the zoom movie lens.

[0034] 5. By limiting the bending direction of the second lens group, the distortion of the optical path by the zoom lens group is reduced, the possibility of deformation and distortion from the center to the periphery of the image is reduced, and the imaging quality of the zoom movie lens is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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 zoom movie lens and a camera device.

[0036] Figure 1 It is a structural schematic diagram of a zoom movie lens of the present invention;

[0037] Figure 2 It is a schematic structural diagram of another direction of a zoom movie lens of the present invention;

[0038] Figure 3 It is a structural schematic diagram of another zoom movie lens of the present invention;

[0039] Figure 4 is a schematic structural diagram of another zoom movie lens of the present invention in another direction;

[0040] Figure 5 is a diagram of various aberrations of another zoom movie lens in a wide-angle state relative to the d-line of the present invention;

[0041] Figure 6 is a coma diagram of another zoom movie lens in a wide-angle state of the present invention;

[0042] Figure 7 is a diagram of various aberrations of another zoom movie lens in a telephoto state relative to the d-line of the present invention;

[0043] Figure 8is a coma diagram of another zoom movie lens in a telephoto state of the present invention;

[0044] Fig. 9 It is a schematic structural diagram of another zoom movie lens in another direction of the present invention;

[0045] Fig.10 1 is a diagram of various aberrations of another zoom movie lens in a wide-angle state relative to the d-line of the present invention;

[0046] Fig.11 It is a coma diagram of another zoom movie lens in wide-angle state of the present invention;

[0047] Fig.12 1 is a diagram of various aberrations of another zoom movie lens in a telephoto state relative to the d-line of the present invention;

[0048] Fig.13 This is a coma diagram of another zoom movie lens in the telephoto state of the present invention.

[0049] Explanation of the accompanying drawings: GA, zoom lens group; Ga1, first lens group; Ga2, second lens group; GB, fixed lens group; Gb1, first fixed lens group; Gb2, movable lens group; Gb3, second fixed lens group; GC, focusing lens group; Gc1, first focusing lens group; Gc2, second focusing lens group; Gc3, third focusing lens group; GD, auxiliary lens group; GE, cylindrical lens group; GF, compensation lens group. DETAILED DESCRIPTION

[0050] 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.

[0051] 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". The left side is the object side, and the right side is the image side.

[0052] Embodiment 1: Figure 1 and Figure 2As shown, a zoom movie lens comprises: a zoom lens group GA with negative optical power, a fixed lens group GB with positive optical power, a focusing lens group GC, a cylindrical lens group GE and a compensation lens group GF with positive optical power, which are arranged in sequence from the object side to the image side.

[0053] When changing the magnification, the interval between the zoom lens group GA and the focusing lens group GC, and the interval between the focusing lens group GC and the cylindrical lens group GE, change through the movement of the zoom lens group GA and / or the focusing lens group GC; that is, when changing the magnification, the zoom lens group GA and / or the focusing lens group GC moves back and forth to achieve the change of the focal length of the zoom movie lens.

[0054] The zoom lens group GA satisfies the following conditional expression (1):

[0055] α*M / TTL<2 (1);

[0056] Wherein, α is a preset lens coefficient, M is a maximum moving distance of the zoom lens group GA, and TTL is the total optical length of the movie lens. In this embodiment, the parameter range of α is 50 to 150, and the specific value can be changed according to the type of actual lens. Preferably, α is selected to be 100.

[0057] The zoom lens group GA can realize the zooming effect of the zoom movie lens during the movement, and the movement of the focus lens group can also realize the focusing effect of the zoom movie lens.

[0058] By limiting the maximum moving distance of the zoom lens group GA, the moving range of the zoom lens group GA is reduced, thereby reducing the change in the field angle of the zoom movie lens during movement, reducing the possibility of breathing effect, and improving the imaging quality of the movie lens.

[0059] Preferably, the zoom lens group GA and the fixed lens group GB satisfy the following conditional equation (2):

[0060] 0.2<α*N / TTL<1.5 (2);

[0061] Wherein, N is the distance between the zoom lens group GA and the fixed lens group GB, and α is a preset lens coefficient, which is the same as the coefficient in conditional equation (1).

[0062] By limiting the distance between the zoom lens group GA and the fixed lens group GB, the possibility of a sharp drop in the performance of the optical lens due to the small distance between the zoom lens group GA and the fixed lens group GB is reduced, thereby increasing the reliability of the zoom movie lens; the possibility of excessive changes in the field of view angle due to the large distance between the zoom lens group GA and the fixed lens group GB is also reduced, thereby reducing the breathing effect of the zoom movie lens and increasing the imaging quality of the zoom movie lens.

[0063] In the present embodiment, in order to realize the function of image compression, a cylindrical lens group GE is further added to the zoom movie lens, which is realized by a cylindrical lens group plus an ordinary spherical lens group; in the present embodiment, the cylindrical lens group GE is vertically arranged, that is, the vertical surface of the cylindrical lens group GE is a cylinder, and the upper and lower surfaces of the cylindrical lens group GE are both horizontal planes.

[0064] When the light path passes through the cylindrical lens group GE, the light path in the vertical direction continues to extend in the same vertical plane, while the light path in the horizontal direction is refracted when passing through the cylindrical lens group GE, and the projection range of the light path is increased, thereby achieving the effect of a distorted wide screen.

[0065] The cylindrical lens group GE is arranged on the side close to the image side, which reduces the volume of the cylindrical lens group GE and is conducive to miniaturization of the zoom movie lens.

[0066] Preferably, when the zoom lens group GA is located close to the image side, that is, when the zoom lens group GA is located on the left side, the zoom movie lens is in a wide-angle state.

[0067] The zoom movie lens in the wide-angle state satisfies the following conditional expression (3):

[0068] 0.5 <EFL w / BFL<1.5 (3);

[0069] Among them, EFL w is the focal length of the zoom movie lens in the wide-angle state, and BFL is the optical back focus of the zoom movie lens.

[0070] By limiting the focal length of the zoom movie lens in the wide-angle state, the optical power of the zoom movie lens is optimized, reducing the possibility of the compensation lens group being too long or too short, thereby reducing the possibility of spherical aberration, peripheral coma and chromatic aberration, and improving the imaging quality of the zoom movie lens.

[0071] Preferably, when the zoom lens group GA is located close to the image side, that is, when the zoom lens is located on the left side, the zoom movie lens is in a wide-angle state.

[0072] The zoom movie lens in the wide-angle state satisfies the conditional equation (4) shown below:

[0073] 0.8 <F GA / EFL w <1.5 (4);

[0074] Among them, F GA is the focal length of the zoom lens group GA, EFL w This is the focal length of a zoom movie lens at wide angle.

[0075] By limiting the ratio of the focal length of the zoom lens group GA to the focal length of the zoom movie lens in the wide-angle state, the focal length of the zoom lens group GA is optimized, and the possibility of the focal length of the zoom lens group GA being too large or too small is reduced, thereby reducing the possibility of the zoom lens group GA or the remaining lens groups having too low a focal length, reducing the possibility of an increase in the radius of the zoom lens group GA or the remaining lens groups, reducing the total mass of the zoom movie lens, facilitating the focusing process of the zoom movie lens, reducing the possibility of spherical aberration, peripheral chromatic aberration and coma, and improving the imaging quality of the zoom movie lens.

[0076] Preferably, the cylindrical lens group GE includes at least one cemented cylindrical lens group.

[0077] By setting up a cemented cylindrical lens group, the resolution of the lens is increased, the possibility of spherical aberration, peripheral chromatic aberration and coma is reduced, and the imaging quality of the zoom movie lens is improved.

[0078] Embodiment 2: Figure 1 and Figure 2 As shown, a zoom movie lens is shown. The difference between this embodiment and the first embodiment lies in the specific structure of the zoom lens group GA.

[0079] On the basis of the first embodiment, in this embodiment, the zoom lens group GA includes at least a first lens group Ga1 and a second lens group Ga2 with negative optical power, the first lens group Ga1 is close to the object side, that is, the first lens group Ga1 is located on the left side, and the second lens group Ga2 is close to the image side, and the second lens group Ga2 is located on the right side.

[0080] The zoom lens group GA satisfies the following conditional expression (5):

[0081] -1<φ Ga2 / φ Ga1 <1 (5);

[0082] Among them, φ Ga1 is the focal length of the first lens group Ga1, φ Ga2 is the optical power of the second lens group Ga2.

[0083] By limiting the power ratio of the first lens group Ga1 and the second lens group Ga2, the negative power of the zoom lens group GA is achieved.

[0084] Preferably, the second lens group Ga2 is bent toward the image side, that is, the second lens group Ga2 can be bent to the right.

[0085] By limiting the bending direction of the second lens group Ga2, the distortion of the optical path by the zoom lens group GA is reduced, the possibility of deformation and distortion of the image from the center to the periphery is reduced, and the imaging quality of the zoom movie lens is improved.

[0086] Preferably, at least one aspherical lens is provided in the first lens group Ga1 and / or the second lens group Ga2.

[0087] By using aspherical lenses, the resolution of the zoom movie lens is increased, the possibility of matching with high-resolution cameras is increased, and the quality of the zoom movie lens is reduced, which improves the user experience.

[0088] Embodiment 3: Figure 1 and Figure 2 As shown, a zoom movie lens is shown. The difference between this embodiment and the first embodiment lies in the specific structure of the focusing lens group GC.

[0089] On the basis of the first embodiment, in this embodiment, the focusing lens group GC includes at least two focusing lens groups; when changing the magnification, the distance between the focusing lens group and the fixed lens group GB, and the distance between two adjacent focusing lens groups, change with the movement of the zoom lens group GA; in this embodiment, the first focusing lens group Gc1 is arranged on the side close to the object side, that is, the left side, and the second focusing lens group Gc2 is arranged on the side close to the image side, that is, the right side, and both focusing lens groups can move independently.

[0090] By setting up multiple focusing lens groups, the focusing ability of the focusing lens group GC is further increased, the possibility of spherical aberration, peripheral chromatic aberration and coma is reduced, and the imaging quality of the zoom movie lens is improved.

[0091] Preferably, the fixed lens group GB includes at least two fixed lens groups, and a movable lens group Gb2 is provided between the two fixed lens groups.

[0092] The moving direction of the moving lens group Gb2 is opposite to the moving direction of the zoom lens group GA.

[0093] By setting the mobile lens group Gb2 that moves in the opposite direction within the fixed lens group GB, the focusing ability of the light path in the focusing lens group is optimized, the possibility of spherical aberration, peripheral chromatic aberration and coma is reduced, and the imaging quality of the zoom movie lens is improved.

[0094] Embodiment 4: Figure 3 and Figure 4As shown, a zoom movie lens is provided, which includes a zoom lens group GA with negative optical power, a fixed lens group GB with positive optical power, an aperture, a focusing lens group GC with positive optical power, an auxiliary lens group GD with positive optical power, a cylindrical lens group GE with negative optical power, and a compensation lens group GF with positive optical power, which are arranged in sequence from the object side to the image side.

[0095] The zoom lens group GA includes a first lens group Ga1 and a second lens group Ga2. The first lens group Ga1 is composed of lenses L1 to L3, and the second lens group Ga2 is composed of lenses L4 and L5.

[0096] The fixed lens group GB includes a first fixed lens group Gb1, a movable lens group Gb2, and a second fixed lens group Gb3. The first fixed lens group Gb1 is composed of a lens L6 and a doublet lens L7, the movable lens group Gb2 is composed of a doublet lens L8 and a lens L9, and the second fixed lens group Gb3 is composed of a lens L10.

[0097] The focusing lens group GC includes a first focusing lens group Gc1, a second focusing lens group Gc2 and a third focusing lens group Gc3. The first focusing lens group Gc1 is composed of a double-cemented lens L11 and a lens L12, the second focusing lens group Gc2 is composed of a lens L13, a lens L14 and a lens 15, and the third focusing lens group Gc3 is composed of a lens L16, a double-cemented lens L17 and a lens 18.

[0098] The auxiliary lens group GD is composed of a lens L19 , a lens L20 , and a doublet lens 21 .

[0099] The cylindrical lens group GE is composed of a double cemented cylindrical lens L22, a double cemented cylindrical lens L23 and a double cemented cylindrical lens 24.

[0100] The compensation lens group is composed of a doublet lens L25, a doublet lens L26 and a doublet lens 27.

[0101] Table 1 shows basic lens data of the zoom movie lens of this embodiment, Table 2 shows variable parameters in Table 1, and Table 3 shows aspherical coefficients.

[0102] In Table 1, 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 Y curvature radius column and the X curvature radius column show the curvature radius of a certain lens in two directions in a vertical plane; the thickness column shows the surface interval on the optical axis between each surface and the surface adjacent to the image side thereof; 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.

[0103] In Table 2, the WIDE column indicates specific values ​​of various variable parameters when the zoom movie lens is in a wide-angle state, and the TELE column indicates specific values ​​of various variable parameters when the zoom movie lens is in a telephoto state.

[0104] In Table 3, K is the cone coefficient, and e is the scientific notation, for example, e-005 represents 10-5.

[0105] In this embodiment, the EFL of the zoom movie lens is 40-100mm, and when the zoom movie lens is in the wide-angle state, the EFL of the zoom movie lens is 40mm, and when the zoom movie lens is in the telephoto state, the EFL of the zoom movie lens is 100mm; the TNO of the zoom movie lens is 3.5, and TNO is the aperture value after the transmittance of the lens is calculated; and the TTL is 400mm.

[0106]

Table 1

[0107]

[0108]

[0109]

Table 2

[0110] WIDE TELE D0 1.03 5.03 D1 0.63 31.94 D2 33.11 1.81 D3 20.74 9.21 D4 20.16 11.60 D5 0.52 16.50 D6 9.20 13.30

[0111]

Table 3

[0112] K A(4th) B(6th) C(8th) D(10th) S7 -1 2.50E-07 -1.10E-06 3.20E-10 -2.60E-09 S8 0 -6.65E-05 3.01E-06 -1.84E-07 -3.37E-10 S27 0 -7.25E-07 5.23E-05 2.31E-10 -3.17E-09 S28 0 7.59E-08 4.17E-06 -1.38E-07 -3.69E-09 S31 2.367 1.44E-06 -4.33E-07 3.17E-08 -5.13E-08 S32 -1.15 2.56E-04 -7.14E-05 -1.85E-08 -8.16E-09 S35 -2.56 5.32E-05 -8.56E-07 4.12E-08 -1.86E-08 S36 -3.81 4.25E-04 -7.56E-05 -7.93E-08 -8.96E-09

[0113] exist Figure 5 Graphs showing various aberrations of the zoom lens of Example 4 are shown in FIG. Figure 5 In the figure, from left to right, the spherical aberration, field curvature, and distortion values ​​of the zoom movie lens at wide angles are shown; Figure 6 The coma of the zoom movie lens at various angles is shown; Figure 7 In the figure, from left to right, the spherical aberration, field curvature, and distortion values ​​of the zoom movie lens at telephoto state are shown; Figure 8 Shows the coma of a zoom movie lens at various angles at telephoto.

[0114] Embodiment 5: Figure 3 and Fig. 9 As shown, a zoom movie lens is provided, which includes a zoom lens group GA with negative optical power, a fixed lens group GB with positive optical power, an aperture, a focusing lens group GC with positive optical power, an auxiliary lens group GD with positive optical power, a cylindrical lens group GE with negative optical power, and a compensation lens group GF with positive optical power, which are arranged in sequence from the object side to the image side.

[0115] The zoom lens group GA includes a first lens group Ga1 and a second lens group Ga2. The first lens group Ga1 is composed of lenses L1 to L3, and the second lens group Ga2 is composed of lenses L4 and L5.

[0116] The fixed lens group GB includes a first fixed lens group Gb1, a movable lens group Gb2, and a second fixed lens group Gb3. The first fixed lens group Gb1 is composed of a lens L6 and a doublet lens L7, the movable lens group Gb2 is composed of a doublet lens L8 and a lens L9, and the second fixed lens group Gb3 is composed of a lens L10.

[0117] The focusing lens group GC includes a first focusing lens group Gc1, a second focusing lens group Gc2 and a third focusing lens group Gc3. The first focusing lens group Gc1 is composed of a double-cemented lens L11 and a lens L12, the second focusing lens group Gc2 is composed of a lens L13, a lens L14 and a lens 15, and the third focusing lens group Gc3 is composed of a lens L16, a double-cemented lens L17 and a lens 18.

[0118] The auxiliary lens group GD is composed of a lens L19 , a lens L20 , and a doublet lens 21 .

[0119] The cylindrical lens group GE is composed of a double cemented cylindrical lens L22, a double cemented cylindrical lens L23 and a double cemented cylindrical lens 24.

[0120] The compensation lens group is composed of a doublet lens L25, a doublet lens L26 and a doublet lens 27.

[0121] Basic lens data of the zoom movie lens of this embodiment is shown in Table 4, variable parameters in Table 4 are shown in Table 5, and aspheric coefficients are shown in Table 6.

[0122] In Table 4, 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 Y curvature radius column and the X curvature radius column show the curvature radii of a certain prism in two directions in the vertical plane; the thickness column shows the surface spacing on the optical axis between each surface and the surface adjacent to the image side thereof; 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.

[0123] In Table 5, the WIDE column indicates specific values ​​of various variable parameters when the zoom movie lens is in a wide-angle state, and the TELE column indicates specific values ​​of various variable parameters when the zoom movie lens is in a telephoto state.

[0124] In Table 6, K is the cone coefficient, and e is the scientific notation, for example, e-005 represents 10-5.

[0125] In this embodiment, the EFL of the zoom movie lens is 40-100mm, and when the zoom movie lens is in the wide-angle state, the EFL of the zoom movie lens is 40mm, and when the zoom movie lens is in the telephoto state, the EFL of the zoom movie lens is 100mm; the TNO of the zoom movie lens is 3.5, and TNO is the aperture value after the transmittance of the lens is calculated; and the TTL is 430mm.

[0126]

Table 4

[0127]

[0128]

[0129]

Table 5

[0130] WIDE TELE D0 0.98 5.12 D1 0.68 32.00 D2 33.19 1.89 D3 20.75 9.21 D4 20.17 11.86 D5 0.58 16.55 D6 9.21 13.07

[0131]

Table 6

[0132] K A(4th) B(6th) C(8th) D(10th) S7 -1 4.27E-07 -1.25E-06 3.51E-10 -4.15E-09 S8 0 9.24E-05 3.39E-06 -2.70E-07 -3.58E-10 S27 0 -1.29E-06 6.20E-05 3.58E-10 -6.33E-09 S28 0 1.03E-07 6.96E-06 -2.46E-07 -5.78E-09 S31 1.45 2.11E-06 -5.38E-07 4.11E-08 -7.83E-08 S32 -1.38 3.47E-04 -8.38E-05 -2.52E-08 -1.38E-08 S35 -1.96 9.63E-05 -7.92E-07 8.56E-08 -1.38E-08 S36 -2.74 8.43E-04 -4.12E-05 -7.41E-08 -8.02E-09

[0133] exist Fig.10 Graphs showing various aberrations of the zoom lens of Example 5 are shown in FIG. Fig.10 In the figure, from left to right, the spherical aberration, field curvature, and distortion values ​​of the zoom movie lens at wide angles are shown; Fig.11 The coma of the zoom movie lens at various angles is shown; Fig.12 In the figure, from left to right, the spherical aberration, field curvature, and distortion values ​​of the zoom movie lens at telephoto state are shown; Fig.13 Shows the coma of a zoom movie lens at various angles at telephoto.

[0134] Example 6: Figures 1 to 13 As shown, a camera device is provided with the zoom movie lens described in any one of the above embodiments.

[0135] 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 zoom movie lens, characterized in that: include: A zoom lens group with negative optical power, a fixed lens group with positive optical power, a focusing lens group, a cylindrical lens group and a compensating lens group with positive optical power are arranged in sequence from the object side to the image side; During the magnification change, the interval between the zoom lens group and the focusing lens group, and the interval between the focusing lens group and the cylindrical lens group are changed by the movement of the zoom lens group and / or the focusing lens group; The zoom lens group is used to realize the zoom effect of the zoom movie lens during the movement, and the movement of the focus lens group is used to realize the focusing effect of the zoom movie lens; The zoom lens group satisfies the following conditional equation (1): α*M / TTL<2 (1); Wherein, α is the preset lens coefficient, M is the maximum moving distance of the zoom lens group, and TTL is the total optical length of the movie lens; The zoom lens group and the fixed lens group satisfy the following conditional expression (2): 0.2<α*N / TTL<1.5 (2); Wherein, N is the distance between the zoom lens group and the fixed lens group; The zoom movie lens in the wide-angle state satisfies the following conditional expression (3): 0.5 < EFL w / BFL < 1.5 (3); Among them, EFL w is the focal length of the zoom movie lens in the wide-angle state, and BFL is the optical back focus of the zoom movie lens; When the zoom lens group is located close to the image side, the zoom movie lens is in a wide-angle state; The wide-angle zoom movie lens satisfies the following conditional expression (4): 0.8 < F GA / EFL w < 1.5 (4); Among them, F GA is the focal length of the zoom lens group, EFL w is the focal length of the zoom movie lens in the wide-angle state; The zoom lens group at least includes a first lens group and a second lens group with negative optical power, the first lens group is close to the object side, and the second lens group is close to the image side; The zoom lens group satisfies the following conditional equation (5): -1<φ Ga2 / f Ga1 <1 (5); Among them, φ Ga1 is the focal power of the first lens group, φ Ga2 is the optical power of the second lens group.

2. A zoom movie lens according to claim 1, characterized in that: The second lens group is curved toward the image side.

3. The zoom movie lens according to claim 1, characterized in that: At least one aspherical lens is provided in the first lens group and / or the second lens group.

4. The zoom movie lens according to claim 1, characterized in that: The focusing lens group includes at least two focusing lens groups; When changing the magnification, the distance between the focusing lens group and the fixed lens group, and the distance between two adjacent focusing lens groups change with the movement of the zoom lens group.

5. A zoom movie lens according to claim 1 or 4, characterized in that: The fixed lens group includes at least two fixed lens groups, and a movable lens group is provided between the two fixed lens groups; The moving direction of the moving lens group is opposite to the moving direction of the zoom lens group.

6. The zoom movie lens according to claim 1, characterized in that: The cylindrical lens group includes at least one cemented cylindrical lens group.

7. A camera device, characterized in that: The camera device is provided with a zoom movie lens as claimed in any one of claims 1 to 6.

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