CN210776006U - Zoom film lens and camera device - Google Patents
Zoom film lens and camera device Download PDFInfo
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- CN210776006U CN210776006U CN201921962929.7U CN201921962929U CN210776006U CN 210776006 U CN210776006 U CN 210776006U CN 201921962929 U CN201921962929 U CN 201921962929U CN 210776006 U CN210776006 U CN 210776006U
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Abstract
The utility model discloses a zoom film lens and camera device, which relates to the technical field of lenses, the utility model comprises a zoom lens group with negative focal power, a fixed lens group with positive focal power, a focusing lens group, a cylindrical lens group and a compensating lens group with positive focal power, which are arranged in sequence from an object side to an image side, wherein, when zooming, 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 through the movement in the zoom lens group and/or the focusing lens group, the zoom lens group meets the conditional expression (1) represented as α M/TTL <2(1), wherein, α is preset lens coefficient, M is the maximum moving distance of the zoom lens group, TTL is the total optical length of the film lens, the utility model reduces the possibility of compensating lens group or over short, then reduces the possibility of spherical aberration and peripheral coma and the possibility of generation, and increases the imaging quality of the zoom film lens.
Description
Technical Field
The utility model relates to a camera lens technical field especially relates to a film camera lens and camera device zoom.
Background
A movie shot is, as the name implies, a shot for movie shooting. The film lens has the top-level optical quality, and the mechanical structure of the film lens is designed to fully take the professional requirements of film production into consideration. Since these lenses are specifically tailored to the film shooting environment, they may not be well suited for use in other areas. The installation of a focus-following ring gear and the alteration of a stepless aperture on a camera lens does not make it a film lens.
With the gradual cost reduction of materials, cameras with large-size photosensitive parts are continuously emerging, the industrial pattern of few lenses and more machines is gradually formed, and a plurality of lens manufacturers start to modify and paint the camera lenses and use movie lenses or put the cameras on the market in the name of movie lenses or movie-style lenses.
The difference between the two lenses was very apparent in the long past in hollywood. Today is another scene and as manufacturers push cheaper footage, the boundary between the two continues to be blurred, and some key footage characteristics must be sacrificed in order to achieve lower prices.
In the process of focusing of a conventional cinema lens, a series of displacements occur in an inner lens group, so that incident light at a specific distance is focused on an imaging surface. When the focus is shifted among a plurality of focuses, the displacement of the lens group inside the lens may slightly change the size of the visual field of the picture, which looks like slightly zooming, and the imaging quality of the movie lens is reduced.
Disclosure of Invention
The utility model discloses will solve current technical problem, provide a film camera lens and camera device zoom, reduced compensation lens crowd overlength or the short possibility of mistake, reduced spherical aberration and peripheral coma and the possibility that the colour difference produced then, increased the imaging quality of film camera lens of zooming.
The utility model provides a technical scheme as follows:
a zoom cinematograph lens comprises a zoom lens group with negative focal power, a fixed lens group with positive focal power, a focusing lens group, a cylindrical lens group and a compensating lens group with positive focal power, wherein the zoom lens group, the fixed lens group, the focusing lens group, the cylindrical lens group and the compensating lens group are sequentially arranged from an object side to an image side, when zooming is carried out, 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 through movement in the zoom lens group and/or the focusing lens group, the zoom lens group meets the following conditional expression (1) α M/TTL <2(1), wherein α is a preset lens coefficient, M is the maximum moving distance of the zoom lens group, and TTL is the total optical length of the cinematograph lens.
In the technical scheme, the moving range of the zoom lens group is reduced by limiting the maximum moving distance of the zoom lens group, so that the change of the field angle of the zoom cinematograph lens in the moving process is reduced, the possibility of respiratory effect generation is reduced, and the imaging quality of the cinematograph lens is improved.
Preferably, the zoom lens group and the fixed lens group satisfy a conditional expression (2) of 0.2< α × N/TTL <1.5(2), where N is a distance between the zoom lens group and the fixed lens group.
In the technical scheme, the possibility of sharp decline of the performance of the optical lens caused by the undersize distance between the zoom lens group and the fixed lens group is reduced by limiting the distance between the zoom lens group and the fixed lens group, and the reliability of the zoom movie lens is improved; the possibility of overlarge change of the field angle caused by overlarge distance between the zoom lens group and the fixed lens group is reduced, the breathing effect of the zoom cinematograph lens is reduced, and the imaging quality of the zoom cinematograph lens is improved.
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 a conditional expression (3) represented as follows: 0.5<EFLw/BFL<1.5 (3); wherein, EFLwThe focal length of the zoom film lens in the wide-angle state is defined, and the BFL is the optical back focus of the zoom film lens.
In the technical scheme, the focal length of the zoom film lens in the wide-angle state is limited, so that the focal power of the zoom film lens is optimized, the possibility that the compensation lens group is too long or too short is reduced, the possibility of generation of spherical aberration, peripheral coma aberration and chromatic aberration is reduced, and the imaging quality of the zoom film lens is improved.
Preferably, when the zoom lens group is located close to the image sideThe zoom movie lens is in a wide-angle state; the zoom movie lens in the wide-angle state satisfies a conditional expression (4) represented as follows: 0.8<FGA/EFLw<1.5 (4); wherein, FGAIs the focal length, EFL, of the zoom lens groupwThe focal length of the zoom cinematograph lens in the wide-angle state is shown.
In the technical scheme, the focal length of the zoom lens group is optimized through the limitation of the ratio of the focal length of the zoom lens group to the focal length of the zoom film lens in the wide-angle state, the possibility that the focal length of the zoom lens group is too large or too small is reduced, the possibility that the focal length of the zoom lens group or the focal length of other lens groups is too low is reduced, the possibility that the radius of the zoom lens group or the radius of other lens groups is increased is reduced, the total quality of the zoom film lens is reduced, the focusing process of the zoom film lens is facilitated, the possibility of spherical aberration, peripheral chromatic aberration and coma is reduced, and the imaging quality of the zoom film lens is improved.
Preferably, the zoom lens group includes at least a first lens group and a second lens group having negative power, the first lens group being close to the object side, the second lens group being close to the image side; the zoom lens group satisfies a conditional expression (5) represented as follows: -1<φGa2/φGa1<1 (5); wherein phi isGa1Is the power of the first lens group, phiGa2Is the optical power of the second lens group.
In the technical scheme, the negative focal power of the zoom lens group is realized by limiting the focal power ratio of the first lens group to the second lens group.
Preferably, the second lens group is curved in a direction toward the image side.
In the technical scheme, the distortion of the zoom lens group to the light path is reduced by limiting the bending direction of the second lens group, the deformation and distortion possibility of the picture from the center to the most periphery are reduced, and the imaging quality of the zoom movie lens is improved.
Preferably, at least one aspheric lens is disposed in the first lens group and/or the second lens group.
In the technical scheme, by using the aspheric 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 increased.
Preferably, the focusing lens group comprises at least two focusing lens groups; when the zooming is carried out, the distance between the focusing lens group and the fixed lens group and the distance between two adjacent focusing lens groups change along with the movement of the zooming lens group.
In the technical scheme, the arrangement of the plurality of focusing lens groups further increases the focusing capacity of the focusing lens group GC, reduces the possibility of spherical aberration, peripheral chromatic aberration and coma aberration, and increases the imaging quality of the zoom film lens.
Preferably, the fixed lens group at least comprises two fixed lens groups, and a movable lens group is further arranged 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.
In the technical scheme, the arrangement of the movable lens group which moves reversely in the fixed lens group optimizes the focusing capacity of the light path in the focusing lens group, reduces the possibility of generating spherical aberration, peripheral chromatic aberration and coma, and increases the imaging quality of the zoom film lens.
Preferably, the cylindrical lens group includes at least one cemented cylindrical lens group.
In the technical scheme, the arrangement of the gluing cylindrical lens group increases the resolving power of the lens, reduces the possibility of generating spherical aberration, peripheral chromatic aberration and coma aberration, and increases the imaging quality of the zoom film lens.
One of the objects of the present invention is to provide a camera device, which is equipped with a zoom lens.
Compared with the prior art, the utility model provides a pair of film camera lens and camera device zoom has following beneficial effect:
1. the moving range of the zoom lens group is reduced by limiting the maximum moving distance of the zoom lens group, so that the change of the field angle of the zoom cinematograph lens in the moving process is reduced, the possibility of generating a respiratory effect is reduced, and the imaging quality of the cinematograph lens is improved.
2. The possibility of sharp decline of the performance of the optical lens caused by the undersize distance between the zoom lens group and the fixed lens group is reduced by limiting the distance between the zoom lens group and the fixed lens group, and the reliability of the zoom movie lens is improved; the possibility of overlarge change of the field angle caused by overlarge distance between the zoom lens group and the fixed lens group is reduced, the breathing effect of the zoom cinematograph lens is reduced, and the imaging quality of the zoom cinematograph lens is improved.
3. By limiting the focal length of the zoom film lens in a wide-angle state, the focal power of the zoom film lens is optimized, the possibility that the compensation lens group is too long or too short is reduced, the possibility of generation of spherical aberration, peripheral coma aberration and chromatic aberration is reduced, and the imaging quality of the zoom film lens is improved.
4. The focal length of the zoom lens group is optimized through the limitation of the ratio of the focal length of the zoom lens group to the focal length of the zoom lens group in the wide-angle state, the possibility that the focal length of the zoom lens group is too large or too small is reduced, the possibility that the focal length of the zoom lens group or the focal length of other lens groups is too low is reduced, the possibility that the radius of the zoom lens group or the radius of other lens groups is increased is reduced, the total quality of the zoom lens is reduced, the focusing process of the zoom lens is facilitated, the possibility of spherical aberration, peripheral chromatic aberration and coma is reduced, and the imaging quality of the zoom lens is improved.
5. The distortion of the zoom lens group to the optical path is reduced by the limitation of the bending direction of the second lens group, the deformation and distortion possibility of the picture from the center to the most periphery are reduced, and the imaging quality of the zoom film lens is improved.
Drawings
The above features, technical features, advantages and implementations of a zoom movie lens and an image pickup apparatus will be further described in the following detailed description of preferred embodiments with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a zoom lens of the present invention;
fig. 2 is a schematic structural view of another direction of the zoom lens of the present invention;
fig. 3 is a schematic structural diagram of another zoom lens of the present invention;
fig. 4 is a schematic structural diagram of another direction of another zoom lens of the present invention;
FIG. 5 is a diagram of various aberrations of a zoom lens of the present invention in a wide-angle state with respect to a d-line;
fig. 6 is a coma diagram of a wide-angle state of another zoom lens of the present invention;
FIG. 7 is a diagram of aberrations of a zoom lens of the present invention in a telephoto state relative to the d-line;
fig. 8 is a coma chart illustrating a telephoto state of the zoom film lens according to another embodiment of the present invention;
FIG. 9 is a schematic view of another direction of a zoom lens according to the present invention;
FIG. 10 is a diagram of various aberrations of a zoom lens of the present invention in a wide-angle state with respect to a d-line;
fig. 11 is a coma diagram of a wide-angle state of a zoom lens according to another embodiment of the present invention;
FIG. 12 is a diagram of aberrations of a zoom lens according to the present invention in a telephoto state with respect to the d-line;
fig. 13 is a coma chart illustrating a telephoto state of the zoom film lens according to the present invention.
The reference numbers illustrate: GA. A zoom lens group; ga1, first lens group; ga2, second lens group; GB. Fixing the lens group; gb1, first fixed lens group; gb2, moving lens group; gb3, second fixed lens group; GC. A focusing lens group; gc1, first focusing lens group; gc2, a second focus lens group; gc3, a third focusing lens group; GD. An auxiliary lens group; GE. A group of cylindrical lenses; GF. And compensating the lens group.
Detailed Description
In order to more clearly illustrate embodiments of the present invention or technical solutions in the prior art, specific embodiments of the present invention will be described below with reference to the accompanying drawings. It is obvious that the drawings in the following description are only examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be obtained from these drawings without inventive effort.
For the sake of simplicity, only the parts related to the utility model are schematically shown in the drawings, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one". The left object side and the right image side.
The first embodiment is as follows: as shown in fig. 1 and 2, a zoom movie lens includes: the zoom lens group GA with negative focal power, the fixed lens group GB with positive focal power, the focusing lens group GC, the cylindrical lens group GE and the compensating lens group GF with positive focal power are arranged in sequence from the object side to the image side.
During zooming, the interval between the zoom lens group GA and the focus lens group GC and the interval between the focus lens group GC and the cylindrical lens group GE are changed by the movement of the zoom lens group GA and/or the focus lens group GC; that is, during zooming, the zoom lens group GA and/or the focus lens group GC move back and forth to change the focal length of the zoom film lens.
The zoom lens group GA satisfies the conditional expression (1) shown below:
α*M/TTL<2 (1)；
wherein α is a preset lens coefficient, M is a maximum moving distance of the zoom lens group GA, and TTL is an optical total length of the movie lens, in this embodiment, a parameter range of α is 50 to 150, specific values can be changed according to a type of an actual lens, and preferably α is selected as 100.
The zoom lens group GA can realize the zooming function of the zoom movie lens in the moving process, and the focusing function of the zoom movie lens can also be realized by the movement of the focusing lens group.
The moving range of the zoom lens group GA is reduced by limiting the maximum moving distance of the zoom lens group GA, so that the change of the field angle of the zoom cinematograph lens in the moving process is reduced, the possibility of generating the respiratory effect is reduced, and the imaging quality of the cinematograph lens is improved.
Preferably, the zoom lens group GA and the fixed lens group GB satisfy a conditional expression (2) represented as follows:
0.2<α*N/TTL<1.5 (2)；
where N is the distance between the zoom lens group GA and the fixed lens group GB, and α is a predetermined lens coefficient and is the same as the coefficient in conditional expression (1).
The possibility of sharp decline of the performance of the optical lens caused by the excessively small distance between the zoom lens group GA and the fixed lens group GB is reduced by limiting the distance between the zoom lens group GA and the fixed lens group GB, and the reliability of the zoom movie lens is improved; the possibility of overlarge change of the field angle caused by overlarge distance between the zoom lens group GA and the fixed lens group GB is also reduced, the breathing effect of the zoom cinematograph lens is reduced, and the imaging quality of the zoom cinematograph lens is improved.
In the embodiment, in order to realize the function of image compression, a cylindrical lens group GE is further added in the zoom movie lens, and the function is realized by adopting a cylindrical lens group and a common spherical lens group; in this embodiment, the cylindrical lens group GE is vertically disposed, that is, the vertical surface of the cylindrical lens group GE is a cylindrical surface, and the upper and lower surfaces of the cylindrical lens group GE are horizontal surfaces.
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, and when the light path in the horizontal direction passes through the cylindrical lens group GE, refraction occurs, the projection range of the light path is enlarged, and then the effect of deforming the wide screen is realized.
The cylindrical lens group GE is arranged on one side close to the image side, so that the volume of the cylindrical lens group GE is reduced, and the miniaturization of the zoom film lens is facilitated.
Preferably, when the zoom lens group GA is located at a position 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.
The zoom movie lens in the wide-angle state satisfies a conditional expression (3) as follows:
0.5<EFLw/BFL<1.5 (3)；
wherein, EFLwThe focal length of the zoom film lens in the wide-angle state is shown, and BFL is the optical back focus of the zoom film lens.
By limiting the focal length of the zoom film lens in a wide-angle state, the focal power of the zoom film lens is optimized, the possibility that the compensation lens group is too long or too short is reduced, the possibility of generation of spherical aberration, peripheral coma aberration and chromatic aberration is reduced, and the imaging quality of the zoom film lens is improved.
Preferably, when the zoom lens group GA is located at a position close to the image side, that is, the zoom lens is located on the left side, the zoom movie lens is in a wide-angle state.
The zoom movie lens in the wide-angle state satisfies a conditional expression (4) as follows:
0.8<FGA/EFLw<1.5 (4)；
wherein, FGAIs the focal length of the GA of the zoom lens group, EFLwIs the focal length in the wide-angle state of the zoom cinematograph lens.
The focal length of the zoom lens group GA is optimized through the limitation of the ratio of the focal length of the zoom lens group GA to the focal length of the zoom lens in a wide-angle state, the possibility that the focal length of the zoom lens group GA is too large or too small is reduced, the possibility that the focal length of the zoom lens group GA or the focal length of other lens groups is too low is reduced, the possibility that the radius of the zoom lens group GA or the radius of other lens groups are increased is reduced, the total quality of the zoom lens is reduced, the focusing process of the zoom lens is facilitated, the possibility of spherical aberration, peripheral chromatic aberration and coma is reduced, and the imaging quality of the zoom lens is improved.
Preferably, the cylindrical lens group GE includes at least one cemented cylindrical lens group.
Through the arrangement of the gluing cylindrical lens group, the resolving power of the lens is increased, the possibility of generating spherical aberration, peripheral chromatic aberration and coma is reduced, and the imaging quality of the zoom film lens is improved.
Example two: as shown in fig. 1 and fig. 2, the present embodiment is different from the first embodiment in the specific structure of the zoom lens group GA.
In addition to the first embodiment, in the present embodiment, the zoom lens group GA includes at least the first lens group GA1 and the second lens group GA2 with negative 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, the second lens group GA2 is close to the image side, and the second lens group GA2 is located on the right side.
The zoom lens group GA satisfies the conditional expression (5) as follows:
-1<φGa2/φGa1<1 (5)；
wherein phi isGa1Is the power of the first lens group Ga1Ga2Is the power of the second lens group Ga 2.
The realization of the negative power of the zoom lens group Ga is realized by the definition of the power ratio of the first lens group Ga1 and the second lens group Ga 2.
Preferably, the second lens group Ga2 is curved in the image-side direction, i.e. the second lens group Ga2 is able to be curved to the right.
The distortion of the optical path of the zoom lens group GA is reduced by the limitation of the bending direction of the second lens group Ga2, the deformation and distortion possibility of the picture from the center to the most periphery are reduced, and the imaging quality of the zoom cinematograph lens is improved.
Preferably, at least one aspherical lens is disposed in the first lens group Ga1 and/or the second lens group Ga 2.
By using the aspheric 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 increased.
Example three: as shown in fig. 1 and 2, a zoom movie lens, the present embodiment is different from the first embodiment in the specific structure of the focusing lens group GC.
On the basis of the first embodiment, in this embodiment, the focusing lens group GC includes at least two focusing lens groups; when zooming, the distance between the focusing lens group and the fixed lens group GB and the distance between two adjacent focusing lens groups change along with the movement of the zoom lens group GA; in the present embodiment, the first focusing lens group Gc1 is disposed on the left side close to the object side, and the second focusing lens group Gc2 is disposed on the right side close to the image side, and both the focusing lens groups are independently movable.
By the arrangement of the plurality of focusing lens groups, the focusing capacity of the focusing lens group GC is further increased, the possibility of generating spherical aberration, peripheral chromatic aberration and coma is reduced, and the imaging quality of the zoom film lens is improved.
Preferably, the fixed lens group GB includes at least two fixed lens groups, and a moving lens group GB2 is further disposed between the two fixed lens groups.
The moving direction of the moving lens group Gb2 is opposite to the moving direction of the zoom lens group GA.
By arranging the moving lens group GB2 which moves reversely in the fixed lens group GB, the focusing power of the optical path in the focusing lens group is optimized, the possibility of spherical aberration and peripheral chromatic aberration and coma is also reduced, and the imaging quality of the zoom movie lens is increased.
Example four: as shown in fig. 3 and 4, a zoom lens group GA having negative refractive power, a fixed lens group GB having positive refractive power, a stop, a focus lens group GC having positive refractive power, an auxiliary lens group GD having positive refractive power, a cylindrical lens group GE having negative refractive power, and a compensation lens group GF having positive refractive power are provided in this order from the object side to the image side.
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.
The fixed lens group GB comprises a first fixed lens group GB1, a moving 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 L7, the moving lens group GB2 is composed of a doublet L8 and a lens L9, and the second fixed lens group GB3 is composed of a lens L10;
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 cemented doublet 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 cemented doublet L17, and a lens 18.
The auxiliary lens group GD is composed of a lens L19, a lens L20, and a double cemented lens 21.
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.
The compensation lens group is composed of a doublet cemented lens L25, a doublet cemented lens L26, and a doublet cemented lens 27.
Table 1 shows basic lens data of the zoom movie lens of the present example, table 2 shows variable parameters in table 1, and table 3 shows aspherical surface coefficients.
In table 1, the surface number when the number is increased one by one toward the image side with the surface on the object side set as the 1 st surface is shown in the column of the surface number; the surface type column shows the surface type of a certain lens; the columns of the Y curvature radius and the X curvature radius show the curvature radius of a certain lens in two directions in the vertical plane; the surface spacing on the optical axis of each surface from the surface adjacent to the image side thereof is shown in the thickness column; the refractive index of a certain lens is shown in the refractive index column; the abbe number of a certain lens is shown in the abbe number column.
In table 2, the WIDE column indicates specific values of the variable parameters when the zoom movie lens is in the WIDE-angle state, and the TELE column indicates specific values of the variable parameters when the zoom movie lens is in the telephoto state.
In Table 3, K is the conic coefficient and e is the scientific count number, e.g., e-005 means 10-5.
In this embodiment, the EFL of the zoom film lens is 40-100mm, and when the zoom film lens is in the wide-angle state, the EFL of the zoom film lens is 40mm, and when the zoom film lens is in the telephoto state, the EFL of the zoom film lens is 100 mm; the TNO of the zoom film lens is 3.5, and the TNO is an aperture value after the transmittance of the lens is calculated; TTL is 400 mm.
[ TABLE 1 ]
[ TABLE 2 ]
| 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 |
[ TABLE 3 ]
| 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 | -3.17 |
| 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 |
Fig. 5 shows respective aberration diagrams of the zoom lens according to the fourth embodiment. In fig. 5, the spherical aberration, curvature of field, and distortion values of the zoom film lens in the wide-angle state are shown from left to right; fig. 6 shows coma at each angle in the wide-angle state of the zoom movie lens; in fig. 7, the spherical aberration, curvature of field, and distortion values of the zoom film lens in the telephoto state are shown from left to right; fig. 8 shows coma for various angles of the zoom movie lens in a telephoto state.
Example five: as shown in fig. 3 and 9, a zoom lens group GA having negative refractive power, a fixed lens group GB having positive refractive power, a stop, a focus lens group GC having positive refractive power, an auxiliary lens group GD having positive refractive power, a cylindrical lens group GE having negative refractive power, and a compensation lens group GF having positive refractive power are provided in this order from the object side to the image side.
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.
The fixed lens group GB comprises a first fixed lens group GB1, a moving 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 L7, the moving lens group GB2 is composed of a doublet L8 and a lens L9, and the second fixed lens group GB3 is composed of a lens L10;
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 cemented doublet 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 cemented doublet L17, and a lens 18.
The auxiliary lens group GD is composed of a lens L19, a lens L20, and a double cemented lens 21.
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.
The compensation lens group is composed of a doublet cemented lens L25, a doublet cemented lens L26, and a doublet cemented lens 27.
Table 4 shows basic lens data of the zoom movie lens of the present example, table 5 shows variable parameters in table 4, and table 6 shows aspherical surface coefficients.
In table 4, the surface numbers when the surface on the object side is set as the 1 st surface and the numbers are increased one by one toward the image side are shown in the column of the surface number; the surface type column shows the surface type of a certain lens; the column for the Y radius of curvature and the column for the X radius of curvature show the radius of curvature of a prism in both directions in the vertical plane; the surface spacing on the optical axis of each surface from the surface adjacent to the image side thereof is shown in the thickness column; the refractive index of a certain lens is shown in the refractive index column; the abbe number of a certain lens is shown in the abbe number column.
In table 5, the WIDE column indicates specific values of the variable parameters when the zoom movie lens is in the WIDE-angle state, and the TELE column indicates specific values of the variable parameters when the zoom movie lens is in the telephoto state.
In Table 6, K is the conic coefficient and e is the scientific count number, e.g., e-005 means 10-5.
In this embodiment, the EFL of the zoom film lens is 40-100mm, and when the zoom film lens is in the wide-angle state, the EFL of the zoom film lens is 40mm, and when the zoom film lens is in the telephoto state, the EFL of the zoom film lens is 100 mm; the TNO of the zoom film lens is 3.5, and the TNO is an aperture value after the transmittance of the lens is calculated; TTL is 430 mm.
[ TABLE 4 ]
[ TABLE 5 ]
| 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 |
[ TABLE 6 ]
| K | A(4th) | B(6th) | C(8th) | D(10th) | |
| S7 | -1 | 4.27E-07 | -1.25E-06 | 3.51E-10 | -4.15 |
| 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 | -6.33 |
| 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 |
Fig. 10 shows respective aberration diagrams of the zoom lens according to embodiment five. In fig. 10, the spherical aberration, curvature of field, and distortion values of the zoom film lens in the wide angle state are shown from left to right; fig. 11 shows coma for each angle in the wide-angle state of the zoom movie lens; in fig. 12, the spherical aberration, curvature of field, and distortion values of the zoom film lens in the telephoto state are shown from left to right; fig. 13 shows coma for each angle in a telephoto state of the zoom movie lens.
Example six: as shown in fig. 1 to 13, an image pickup apparatus provided with the zoom movie lens described in any of the above embodiments.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (11)
1. A zoom cinematographic lens comprising: the zoom lens group with negative focal power, the fixed lens group with positive focal power, the focusing lens group, the cylindrical lens group and the compensating lens group with positive focal power are arranged in sequence from the object side to the image side;
at the time of variable magnification, the interval between the zoom lens group and the focus lens group, and the interval between the focus lens group and the cylindrical lens group are changed by the movement in the zoom lens group and/or the focus lens group;
the zoom lens group satisfies a conditional expression (1) represented 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 an optical total length of the motion picture lens.
2. A zoom cinematographic lens as claimed in claim 1, wherein:
the zoom lens group and the fixed lens group satisfy a conditional expression (2) represented as follows:
0.2<α*N/TTL<1.5 （2）；
and N is the distance between the zoom lens group and the fixed lens group.
3. A zoom cinematographic lens as claimed in claim 1, wherein:
when the zoom lens group is positioned 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 a conditional expression (3) represented as follows:
0.5<EFLw/ BFL<1.5 （3）；
wherein, EFLwThe focal length of the zoom film lens in the wide-angle state is defined, and the BFL is the optical back focus of the zoom film lens.
4. A zoom cinematographic lens as claimed in claim 1, 2 or 3, wherein:
when the zoom lens group is positioned 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 a conditional expression (4) represented as follows:
0.8<FGA/EFLw<1.5 （4）；
wherein, FGAIs the focal length, EFL, of the zoom lens groupwThe focal length of the zoom cinematograph lens in the wide-angle state is shown.
5. A zoom cinematographic lens as claimed in claim 1, wherein:
the zoom lens group at least comprises a first lens group and a second lens group with negative focal 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 a conditional expression (5) represented as follows:
-1<φGa2/φGa1<1 （5）；
wherein phi isGa1Is the power of the first lens group, phiGa2Is the optical power of the second lens group.
6. The zoom movie lens of claim 5, wherein:
the second lens group is curved in a direction toward the image side.
7. The zoom movie lens of claim 5, wherein:
at least one aspheric lens is arranged in the first lens group and/or the second lens group.
8. A zoom cinematographic lens as claimed in claim 1, wherein:
the focusing lens group comprises at least two focusing lens groups;
when the zooming is carried out, the distance between the focusing lens group and the fixed lens group and the distance between two adjacent focusing lens groups change along with the movement of the zooming lens group.
9. A zoom movie lens according to claim 1 or 8, characterized in that:
the fixed lens group at least comprises two fixed lens groups, and a movable lens group is arranged 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.
10. A zoom cinematographic lens as claimed in claim 1, wherein:
the cylindrical lens group comprises at least one gluing cylindrical lens group.
11. An image pickup apparatus characterized in that: the image pickup apparatus is provided with the zoom movie lens according to any one of claims 1 to 10.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921962929.7U CN210776006U (en) | 2019-11-14 | 2019-11-14 | Zoom film lens and camera device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921962929.7U CN210776006U (en) | 2019-11-14 | 2019-11-14 | Zoom film lens and camera device |
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| Publication Number | Publication Date |
|---|---|
| CN210776006U true CN210776006U (en) | 2020-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921962929.7U Active CN210776006U (en) | 2019-11-14 | 2019-11-14 | Zoom film lens and camera device |
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|---|---|
| CN (1) | CN210776006U (en) |
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2019
- 2019-11-14 CN CN201921962929.7U patent/CN210776006U/en active Active
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Address after: 314000 No.188, Taojing Road, Gaozhao street, Xiuzhou District, Jiaxing City, Zhejiang Province Patentee after: Jiaxing Zhongrun Optical Technology Co.,Ltd. Address before: 314000 No.188, Taojing Road, Gaozhao street, Xiuzhou District, Jiaxing City, Zhejiang Province Patentee before: JIAXING ZHONGRUN OPTICAL SCIENCE AND TECHNOLOGY Co.,Ltd. |