CN113359286B - Film lens and image pickup device - Google Patents
Film lens and image pickup device Download PDFInfo
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- CN113359286B CN113359286B CN202110828064.0A CN202110828064A CN113359286B CN 113359286 B CN113359286 B CN 113359286B CN 202110828064 A CN202110828064 A CN 202110828064A CN 113359286 B CN113359286 B CN 113359286B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
- G02B15/1451—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive
- G02B15/145121—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive arranged +-+-+
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention relates to the field of optics, in particular to a film lens and an image pickup device. The movie lens sequentially comprises a first lens group with positive focal power, a second lens group with negative focal power, a diaphragm, a third lens group with positive focal power, a fourth lens group with negative focal power and a fixed lens group with positive focal power from an object plane side to an image plane side; the first lens group, the second lens group, the third lens group and the fourth lens group move along the optical axis direction of the cinematographic lens; through the arrangement of the structure, the zooming function of the movie lens is realized, and in the zooming process, the brightness, the imaging quality, the color restoration and the relative illumination of the images under each focal length are reduced, so that the movie lens is difficult to perceive in the zooming process, and the imaging quality of the movie lens is improved.
Description
Technical Field
The invention relates to the field of optics, in particular to a movie lens and an image pickup device.
Background
A movie shot refers to a shot specifically designed and manufactured for shooting of a movie, video, or the like. In order to meet the requirements of some shooting technologies and film arts, the requirements of the film and television industry on the lens are quite different, and a common camera lens cannot be shaken into a film lens by installing a focusing ring gear or modifying the common camera lens into a stepless diaphragm. Because of the above particularity, the cinematic lens has a high level of optical quality and excellent structural performance tailored to the cinematographic industry, and the lens design becomes difficult because of these factors that must be considered.
Because the scenes of film shooting are often complex and various, a shooting team generally needs to prepare a series of exchangeable fixed-focus film lenses with different focal lengths and can cover a plurality of focal lengths so as to meet the image capturing requirements of large and wide-angle environment framing, character close-up of standard scenes, important detail capturing and the like of film shooting. Meanwhile, due to the technical reason of movie shooting, pictures of the lenses with different focal lengths must be kept in a 'non-inductive switching' state, so that the effects of picture brightness, various aberrations, color restoration, contrast and the like of imaging between the lenses are required to be as close as possible, and the design difficulty and the manufacturing difficulty of the movie lens are further increased.
Disclosure of Invention
The invention solves the technical problems in the prior art, and provides a film lens and an image pickup device, which reduce the brightness, the imaging quality, the color restoration and the relative illumination of the images at all focal lengths, so that the film lens is difficult to perceive in the zooming process, and the imaging quality of the film lens is improved.
The technical scheme provided by the invention is as follows:
a movie lens comprises a first lens group with positive focal power, a second lens group with negative focal power, a diaphragm, a third lens group with positive focal power, a fourth lens group with negative focal power and a fixed lens group with positive focal power in sequence from an object plane side to an image plane side; the first lens group, the second lens group, the third lens group and the fourth lens group move along the optical axis direction of the cinematographic lens; the first lens group consists of a first lens with negative focal power, a second lens with positive focal power and a third lens with positive focal power in sequence from the object plane side to the image plane side; the second lens group consists of four lenses or five lenses, and the second lens group sequentially comprises a fourth lens with negative focal power, a fifth lens with negative focal power, one or two lenses with positive focal power and an eighth lens with negative focal power from the object plane side to the image plane side; the third lens group comprises a ninth lens with positive focal power, a tenth lens with negative focal power, an eleventh lens with positive focal power, a twelfth lens with positive focal power and a thirteenth lens with negative focal power in sequence from the object plane side to the image plane side; the fourth lens group is a fourteenth lens with negative focal power; the fixed lens group consists of two lenses or four lenses, and the fixed lens group sequentially comprises one or two lenses with positive focal power and one or two lenses with negative focal power from the object plane side to the image plane side; Ft/Fw is more than 2.5; and Ft is the focal length of the film lens in a telephoto state, and Fw is the focal length of the film lens in a wide-angle state.
In the technical scheme, the zooming function of the movie lens is realized through the arrangement of the structure, and in the zooming process, the brightness, the imaging quality, the color restoration and the relative illumination of the images under each focal length are reduced, so that the movie lens is difficult to perceive in the zooming process, and the imaging quality of the movie lens is improved.
Preferably, the movie shot satisfies the following conditional expression: Fw/Lw is more than 0.1 and less than 0.2; Ft/Lt is more than 0.35 and less than 0.55; wherein Lw is the optical total length of the film lens in a wide-angle state, and Lt is the optical total length of the film lens in a telephoto state.
In the technical scheme, the optical total length of the movie lens is limited in the wide-angle state and the telescopic state, so that all parameters of the movie lens in the zooming process can be basically consistent, and the imaging quality of the movie lens is further improved.
Preferably, the movie shot satisfies the following conditional expression: phi 5I/Y is more than 0.6 and less than 0.85; and Y is the actual image height of the movie lens, and phi 5I is the outer diameter of the lens close to the image surface side in the fixed lens group.
In the technical scheme, the limitation of the condition formula is beneficial to increasing the size of the sensor and the imaging quality of the film lens, and the overlarge focal length and the overlarge optical total length of the film lens are reduced, so that the imaging quality of the film lens is increased.
Preferably, the diaphragm is disposed on an object plane side of the third lens group and moves along an optical axis direction of the cinema lens along with the third lens group.
In the technical scheme, the possibility of the change of the diaphragm number is further reduced by the arrangement of the movable diaphragm, and then the possibility of the change of the brightness and the imaging quality of the imaging under each focal length of the movie lens is reduced.
Preferably, the movie shot satisfies the following conditional expression: XGMin (2, 3, 4)/XGMax (2, 3, 4) < 0.4; wherein XGmin (2, 3, 4) is the smallest moving distance among the moving distances of the second, third, and fourth lens groups, and XGmax (2, 3, 4) is the largest moving distance among the moving distances of the second, third, and fourth lens groups.
In the technical scheme, the moving paths of the second lens group, the third lens group and the fourth lens group can be overlapped by limiting the maximum distance and the minimum distance in the moving distances of the second lens group, the third lens group and the fourth lens group, so that the volume occupied by the second lens group, the third lens group and the fourth lens group is reduced,
preferably, the movie shot satisfies the following conditional expression: XGMin (2, 3, 4)/XG1 is less than 0.3; xgmax (2, 3, 4)/XG1 > 0.4; wherein XG1 is a moving distance of the first lens group.
In the technical scheme, the maximum moving distance and the minimum moving distance in the moving distances of the second lens group, the third lens group and the fourth lens group are reduced by limiting the proportion of the maximum distance and the minimum distance to the moving distance of the first lens group, namely, the maximum moving distance and the minimum moving distance in the second lens group, the third lens group and the fourth lens group are reduced, namely, the sufficient performance of the movie lens during zooming is ensured, the higher resolving power of the movie lens can be ensured, and the imaging quality of the movie lens is improved.
Preferably, at least one group of cemented lenses is present within the second lens group; and/or at least one group of cemented lenses is present within the third lens group; and/or at least one group of cemented lenses is present within the fourth lens group.
In the technical scheme, the arrangement of the cemented lens effectively reduces the optical total length of the film lens, realizes the miniaturization of the film lens, is favorable for reducing the assembly sensitivity of the film lens, improves the production yield and reduces the production cost.
Preferably, a surface of the eighth lens element on the image plane side is a flat surface.
In the technical scheme, through the arrangement of the plane, the processing difficulty of the lens can be reduced while the aberration is corrected, so that the assembly sensitivity of the lens is reduced, the production yield is improved, and the production cost is reduced.
Preferably, at most one lens in the fixed lens group is an aspheric lens.
In the technical scheme, the spherical aberration of the film lens can be corrected through the arrangement of the aspheric surface, and the imaging quality of the film lens is improved.
It is also an object of the present invention to provide an image pickup apparatus comprising: a movie shot; and an image pickup element configured to receive an image formed by the movie lens.
Compared with the prior art, the movie lens and the image pickup device provided by the invention have the following beneficial effects:
1. through the arrangement of the structure, the zooming function of the movie lens is realized, and in the zooming process, the brightness, the imaging quality, the color restoration and the relative illumination of the images under each focal length are reduced, so that the movie lens is difficult to perceive in the zooming process, and the imaging quality of the movie lens is improved.
2. By limiting the optical total length of the movie lens in the wide-angle state and the telescopic state, all parameters of the movie lens in the zooming process can be basically consistent, and the imaging quality of the movie lens is further improved.
3. The moving paths of the second lens group, the third lens group and the fourth lens group can be overlapped by limiting the maximum distance and the minimum distance in the moving distances of the second lens group, the third lens group and the fourth lens group, the volume occupied by the second lens group, the third lens group and the fourth lens group is reduced,
drawings
The above features, technical features, advantages and implementations of a cinema lens and an image pickup apparatus will be further described in the following description of preferred embodiments in a clearly understandable manner with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of a film lens in a telescopic state according to the present invention;
FIG. 2 is a schematic diagram of a wide-angle state of a cinematic lens according to the present invention;
FIG. 3 is a color difference diagram of a film lens in a telescopic state according to the present invention;
FIG. 4 is a color difference diagram of a wide-angle state of a cinematographic lens according to the present invention;
FIG. 5 is a schematic view of the structure of the telephoto state of another cinematographic lens according to the present invention;
FIG. 6 is a schematic diagram of another movie lens in a wide-angle state according to the present invention;
FIG. 7 is a color difference diagram of a telephoto state of another cinematographic lens according to the invention;
FIG. 8 is a chromatic aberration diagram of a wide-angle state of another cinematographic lens of the present invention;
FIG. 9 is a schematic structural diagram of a telephoto state of a movie lens according to another embodiment of the present invention;
FIG. 10 is a schematic view of a wide-angle view of still another cinematic lens according to the present invention;
FIG. 11 is a color difference diagram of a telephoto state of a cinematographic lens according to another embodiment of the present invention;
fig. 12 is a chromatic aberration diagram of a wide-angle state of still another cinema lens according to the invention.
The reference numbers illustrate: g1, a first lens group; g2, a second lens group; g3, a third lens group; g4, a fourth lens group; g5, fixing the lens group; g6, auxiliary components; l1, first lens; l2, second lens; l3, third lens; l4, fourth lens; l5, fifth lens; l6, sixth lens; l7, seventh lens; l8, eighth lens; l9, ninth lens; l10, tenth lens; l11, eleventh lens; l12, twelfth lens; l13, thirteenth lens; l14, fourteenth lens; l15, fifteenth lens; l16, sixteenth lens; l17, seventeenth lens; l18, eighteenth lens; STO, stop; CG. And (4) protecting the glass.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For the sake of simplicity, only the parts relevant to the invention are schematically shown in the drawings, and they do not represent the actual structure as a product. Moreover, in the interest of brevity and understanding, only one of the components having the same structure or function is illustrated schematically or designated in some of the drawings. In this document, "one" means not only "only one" but also a case of "more than one".
Example 1
A cinematographic lens comprising, in order from an object plane side to an image plane side, a first lens group G1 of positive power, a second lens group G2 of negative power, a stop STO, a third lens group G3 of positive power, a fourth lens group G4 of negative power, and a fixed lens group G5 of positive power;
the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4 move in the optical axis direction of the cinema lens;
the first lens group G1 is composed of a first lens L1 with negative focal power, a second lens L2 with positive focal power and a third lens L3 with positive focal power in sequence from the object plane side to the image plane side;
the second lens group G2 is composed of four lenses or five lenses, and the second lens group G2 includes, in order from the object plane side to the image plane side, a fourth lens L4 with negative focal power, a fifth lens L5 with negative focal power, one or two lenses with positive focal power, and an eighth lens L8 with negative focal power;
the third lens group G3 comprises a ninth lens L9 with positive focal power, a tenth lens L10 with negative focal power, an eleventh lens L11 with positive focal power, a twelfth lens L12 with positive focal power and a thirteenth lens L13 with negative focal power in sequence from the object plane side to the image plane side;
the fourth lens group G4 is a fourteenth lens L14 having negative refractive power;
the fixed lens group G5 is composed of two or four lenses, and the fixed lens group G5 includes one or two lenses with positive focal power and one or two lenses with negative focal power in order from the object plane side to the image plane side.
Ft/Fw＞2.5；
And Ft is the focal length of the film lens in a telephoto state, and Fw is the focal length of the film lens in a wide-angle state.
In this embodiment, through the arrangement of the above structure, the zoom function of the movie lens is realized, and in the zooming process, the brightness, the imaging quality, the color restoration, and the relative illumination of the images under each focal length are reduced, so that the movie lens is hard to be perceived in the zooming process, and the imaging quality of the movie lens is increased.
The movie lens meets the following conditional expression:
0.1＜Fw/Lw＜0.2；
0.35＜Ft/Lt＜0.55；
wherein Lw is the optical total length of the film lens in a wide-angle state, and Lt is the optical total length of the film lens in a telephoto state.
In this embodiment, by limiting the optical total length of the movie lens in the wide-angle state and the telephoto state, each parameter of the movie lens in the zooming process can be substantially consistent, and the imaging quality of the movie lens is further improved.
The movie lens meets the following conditional expression:
0.6＜φ5I/Y＜0.85；
wherein Y is the actual image height of the cinematographic lens, and Φ 5I is the outer diameter of the lens on the image plane side in the fixed lens group G5.
In this embodiment, the limitation of the above conditional expressions is beneficial to increasing the size of the sensor and the imaging quality of the cinema lens, and also reduces the possibility of too large focal length and too large optical total length of the cinema lens, thereby increasing the imaging quality of the cinema lens.
The stop STO is provided on the object plane side of the third lens group G3 and moves in the optical axis direction of the cinema lens following the third lens group G3.
In this embodiment, the movable stop STO is provided to further reduce the possibility of the change of the diaphragm number, and then reduce the possibility of the change of the brightness and the imaging quality of the image of each focal length of the cinematographic lens.
The movie lens meets the following conditional expression: XGMin (2, 3, 4)/XGMax (2, 3, 4) < 0.4;
wherein XGmin (2, 3, 4) is the smallest moving distance among the moving distances of the second, third, and fourth lens groups G2, G3, and G4, and XGmax (2, 3, 4) is the largest moving distance among the moving distances of the second, third, and fourth lens groups G2, G3, and G4.
In the present embodiment, the moving paths of the second lens group G2, the third lens group G3, and the fourth lens group G4 can be overlapped by the limitation of the maximum distance and the minimum distance among the moving distances of the second lens group G2, the third lens group G3, and the fourth lens group G4, and the volume occupied by the second lens group G2, the third lens group G3, and the fourth lens group G4 is reduced,
the movie lens meets the following conditional expression:
XGmin(2，3，4)/XG1＜0.3；
XGmax(2，3，4)/XG1＞0.4；
wherein XG1 is a moving distance of the first lens group G1.
The maximum moving distance and the minimum moving distance in the second lens group G2, the third lens group G3 and the fourth lens group G4 are reduced by limiting the ratio of the maximum distance and the minimum distance among the moving distances of the second lens group G2, the third lens group G3 and the fourth lens group G4 to the moving distance of the first lens group G1, namely, the sufficient performance of the movie lens during zooming is ensured, the high resolving power of the movie lens can be ensured, and the imaging quality of the movie lens is improved.
At least one group of cemented lenses is present in the second lens group G2; and/or at least one group of cemented lenses is present in the third lens group G3; and/or at least one cemented lens is present in the fourth lens group G4.
In the embodiment, the arrangement of the cemented lens effectively reduces the optical total length of the film lens, realizes the miniaturization of the film lens, is favorable for reducing the assembly sensitivity of the film lens, improves the production yield and reduces the production cost.
The surface of the eighth lens L8 on the image plane side is a flat surface.
Through the planar setting, can reduce the processing degree of difficulty of lens when rectifying the aberration, and then reduce the equipment sensitivity of lens, improve production yield, reduction in production cost.
In the fixed lens group G5, at most one lens is an aspherical lens.
Through the arrangement of the aspheric surface, the spherical aberration of the film lens can be corrected, and the imaging quality of the film lens is improved.
Example 2
A cinematographic lens includes, in order from an object plane side to an image plane side, a first lens group G1 of positive power, a second lens group G2 of negative power, a stop STO, a third lens group G3 of positive power, a fourth lens group G4 of negative power, a fixed lens group G5 of positive power, and an auxiliary component G6.
The first, second, third, and fourth lens groups G1, G2, G3, and G4 move in the optical axis direction of the cinema lens.
The first lens group G1 is composed of a first lens L1 of negative power, a second lens L2 of positive power, and a third lens L3 of positive power in this order from the object plane side to the image plane side.
The second lens group G2 is composed of, in order from the object plane side to the image plane side, a fourth lens L4 with negative power, a fifth lens L5 with negative power, a sixth lens L6 with positive power, a seventh lens L7 with positive power, and an eighth lens L8 with negative power.
The third lens group G3 includes, in order from the object plane side to the image plane side, a ninth lens L9 having positive refractive power, a tenth lens L10 having negative refractive power, an eleventh lens L11 having positive refractive power, a twelfth lens L12 having positive refractive power, and a thirteenth lens L13 having negative refractive power.
The fourth lens group G4 is a fourteenth lens L14 having negative refractive power.
The fixed lens group G5 is composed of four lenses, and the fixed lens group G5 includes, in order from the object plane side to the image plane side, a fifteenth lens L15 having a positive refractive power, a sixteenth lens L16 having a positive refractive power, a seventeenth lens L17 having a negative refractive power, and an eighteenth lens L18 having a negative refractive power.
The auxiliary component G6 is a cover glass CG.
Table 1 shows basic lens data of the cinema lens of the present example, table 2 shows variable parameters in table 1, and table 3 shows aspherical surface coefficients.
The plane number column indicates the plane number when the number is increased one by one toward the image side with the plane on the object side being the 1 st plane; the surface type column shows the surface type of a certain lens; the radius of curvature of a lens is shown in the column of radius of curvature, positive radius of curvature indicates that the surface is curved in the object side direction, and negative radius of curvature indicates that the surface is curved in the image side direction; the surface spacing on the optical axis of each surface from the surface adjacent to its image side is shown in the center 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 respective variable parameters when the movie scene is in the WIDE-angle end state, and the TELE column indicates specific values of the respective variable parameters when the movie scene is in the telephoto end state.
In Table 3, K is the conic coefficient and e is the scientific count number, e.g., e-005 means 10-5.
[ TABLE 1 ]
[ TABLE 2 ]
| WIDE | TELE | |
| D1 | 1.00 | 37.58 |
| D2 | 17.87 | 2.00 |
| D3 | 2.89 | 26.83 |
| D4 | 10.92 | 4.93 |
[ TABLE 3 ]
In the present embodiment, Fw is 25mm, Ft is 75mm, and Ft/Fw is 3;
and Ft is the focal length of the film lens in a telephoto state, and Fw is the focal length of the film lens in a wide-angle state.
FNOw＝2.03，FNOt＝2.71，Y＝43.26mm；
φ5I＝φ31.86mm，φ5I/Y＝0.73；
Wherein, FNOw is the f-number of film lens under wide angle state, FNOt is for the f-number of film lens under the state of looking far away, Y is the actual image height of film lens.
Lw＝161.34mm，Lt＝200mm；
Fw/Lw＝0.155，Ft/Lt＝0.375；
Wherein Lw is the optical total length of the film lens in a wide-angle state, and Lt is the optical total length of the film lens in a telephoto state.
XG1＝38.66mm，XG2＝2.08mm，XG3＝17.95mm，XG4＝5.99mm；
XGmin(2，3，4)＝XG2＝2.08mm，XGmax(2，3，4)＝XG3＝17.95mm；
XGmin(2，3，4)/XG1＝0.054；
XGmax(2，3，4)/XG1＝0.464；
XGmin(2，3，4)/XGmax(2，3，4)＝0.116；
Where XG1 is a moving distance of the first lens group G1, XGmin (2, 3, 4) is a minimum moving distance among moving distances of the second, third and fourth lens groups G2, G3 and G4, and XGmax (2, 3, 4) is a maximum moving distance among moving distances of the second, third and fourth lens groups G2, G3 and G4.
Example 3
A cinematographic lens includes, in order from an object plane side to an image plane side, a first lens group G1 of positive power, a second lens group G2 of negative power, a stop STO, a third lens group G3 of positive power, a fourth lens group G4 of negative power, a fixed lens group G5 of positive power, and an auxiliary component G6.
The first, second, third, and fourth lens groups G1, G2, G3, and G4 move in the optical axis direction of the cinema lens.
The first lens group G1 is composed of a first lens L1 of negative power, a second lens L2 of positive power, and a third lens L3 of positive power in this order from the object plane side to the image plane side.
The second lens group G2 is composed of a fourth lens L4 with negative power, a fifth lens L5 with negative power, a sixth lens L6 with positive power and an eighth lens L8 with negative power in sequence from the object plane side to the image plane side.
The third lens group G3 includes, in order from the object plane side to the image plane side, a ninth lens L9 having positive refractive power, a tenth lens L10 having negative refractive power, an eleventh lens L11 having positive refractive power, a twelfth lens L12 having positive refractive power, and a thirteenth lens L13 having negative refractive power.
The fourth lens group G4 is a fourteenth lens L14 having negative refractive power.
The fixed lens group G5 is composed of four lenses, and the fixed lens group G5 includes, in order from the object plane side to the image plane side, a fifteenth lens L15 having a positive refractive power, a sixteenth lens L16 having a positive refractive power, a seventeenth lens L17 having a negative refractive power, and an eighteenth lens L18 having a negative refractive power.
The auxiliary component G6 is a cover glass CG.
Table 4 shows basic lens data of the cinema lens of the present example, table 5 shows variable parameters in table 4, and table 6 shows aspherical surface coefficients.
The plane number column indicates the plane number when the number is increased one by one toward the image side with the plane on the object side being the 1 st plane; the surface type column shows the surface type of a certain lens; the radius of curvature of a lens is shown in the column of radius of curvature, positive radius of curvature indicates that the surface is curved in the object side direction, and negative radius of curvature indicates that the surface is curved in the image side direction; the surface spacing on the optical axis of each surface from the surface adjacent to its image side is shown in the center 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 numerical values of the respective variable parameters when the movie lens is in the WIDE-angle end state, and the TELE column indicates specific numerical values of the respective variable parameters when the movie lens is in the telephoto end state.
In Table 6, K is the conic coefficient and e is the scientific count number, e.g., e-005 means 10-5.
[ TABLE 4 ]
[ TABLE 5 ]
| WIDE | TELE | |
| D1 | 1.09 | 42.67 |
| D2 | 33.30 | 2.00 |
| D3 | 2.01 | 33.48 |
| D4 | 15.32 | 6.39 |
[ TABLE 6 ]
In this embodiment, Fw is 24mm, Ft is 80mm, and Ft/Fw is 3.33;
and Ft is the focal length of the film lens in a telephoto state, and Fw is the focal length of the film lens in a wide-angle state.
FNOw＝2.3，FNOt＝3.17，Y＝43.26mm；
φ5I＝φ30.53mm，φ5I/Y＝0.71；
Wherein, FNOw is the f-number of film lens under wide angle state, FNOt is for the f-number of film lens under the state of looking far away, Y is the actual image height of film lens.
Lw＝167.18mm，Lt＝200mm；
Fw/Lw＝0.144，Ft/Lt＝0.4；
Wherein Lw is the optical total length of the film lens in a wide-angle state, and Lt is the optical total length of the film lens in a telephoto state.
XG1＝32.82mm，XG2＝8.76mm，XG3＝22.54mm，XG4＝8.93mm；
XGmin(2，3，4)＝XG2＝8.76mm，XGmax(2，3，4)＝XG3＝22.54mm；
XGmin(2，3，4)/XG1＝0.267；
XGmax(2，3，4)/XG1＝0.687；
XGmin(2，3，4)/XGmax(2，3，4)＝0.389；
Where XG1 is a moving distance of the first lens group G1, XGmin (2, 3, 4) is a minimum moving distance among moving distances of the second, third and fourth lens groups G2, G3 and G4, and XGmax (2, 3, 4) is a maximum moving distance among moving distances of the second, third and fourth lens groups G2, G3 and G4.
Example 4
A cinematographic lens includes, in order from an object plane side to an image plane side, a first lens group G1 of positive power, a second lens group G2 of negative power, a stop STO, a third lens group G3 of positive power, a fourth lens group G4 of negative power, a fixed lens group G5 of positive power, and an auxiliary component G6.
The first, second, third, and fourth lens groups G1, G2, G3, and G4 move in the optical axis direction of the cinema lens.
The first lens group G1 is composed of a first lens L1 of negative power, a second lens L2 of positive power, and a third lens L3 of positive power in this order from the object plane side to the image plane side.
The second lens group G2 is composed of, in order from the object plane side to the image plane side, a negative fourth lens L4, a negative fifth lens L5, a positive sixth lens L6, and a negative eighth lens L8.
The third lens group G3 includes, in order from the object plane side to the image plane side, a ninth lens L9 having positive refractive power, a tenth lens L10 having negative refractive power, an eleventh lens L11 having positive refractive power, a twelfth lens L12 having positive refractive power, and a thirteenth lens L13 having negative refractive power.
The fourth lens group G4 is a fourteenth lens L14 having negative refractive power.
The fixed lens group G5 is composed of four lenses, and the fixed lens group G5 includes, in order from the object plane side to the image plane side, a fifteenth lens L15 having a positive refractive power, a sixteenth lens L16 having a positive refractive power, a seventeenth lens L17 having a negative refractive power, and an eighteenth lens L18 having a negative refractive power.
The auxiliary component G6 is a cover glass CG.
Table 7 shows basic lens data of the cinema lens of the present example, table 8 shows variable parameters in table 7, and table 9 shows aspherical coefficients.
The plane number column indicates the plane number when the number is increased one by one toward the image side with the plane on the object side being the 1 st plane; the surface type column shows the surface type of a certain lens; the radius of curvature of a certain lens is shown in the column of the radius of curvature, and when the radius of curvature is positive, the surface is curved toward the object side, and when the radius of curvature is negative, the surface is curved toward the image side; the surface spacing on the optical axis of each surface from the surface adjacent to its image side is shown in the center 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 8, the WIDE column indicates specific values of the respective variable parameters when the movie scene is in the WIDE-angle end state, and the TELE column indicates specific values of the respective variable parameters when the movie scene is in the telephoto end state.
In Table 9, K is the conic coefficient and e is the scientific count number, e.g., e-005 means 10-5.
[ TABLE 7 ]
[ TABLE 8 ]
| WIDE | TELE | |
| D1 | 1.00 | 50.26 |
| D2 | 49.97 | 2.00 |
| D3 | 3.56 | 22.53 |
| D4 | 9.60 | 7.80 |
[ TABLE 9 ]
In the present embodiment, Fw is 22mm, Ft is 105mm, and Ft/Fw is 4.77;
and Ft is the focal length of the film lens in a telephoto state, and Fw is the focal length of the film lens in a wide-angle state.
FNOw＝2.59，FNOt＝3.44，Y＝43.26mm；
φ5I＝φ31.17mm，φ5I/Y＝0.72；
Wherein, FNOw is the f-number of film lens under wide angle state, FNOt is for the f-number of film lens under the state of looking far away, Y is the actual image height of film lens.
Lw＝181.54mm，Lt＝200mm；
Fw/Lw＝0.121，Ft/Lt＝0.525；
Wherein Lw is the optical total length of the film lens in a wide-angle state, and Lt is the optical total length of the film lens in a telephoto state.
XG1＝18.46mm，XG2＝30.8mm，XG3＝17.17mm，XG4＝1.8mm；
XGmin(2，3，4)＝XG4＝1.8mm，XGmax(2，3，4)＝XG2＝30.8mm；
XGmin(2，3，4)/XG1＝0.098；
XGmax(2，3，4)/XG1＝1.67；
XGmin(2，3，4)/XGmax(2，3，4)＝0.058；
Where XG1 is a moving distance of the first lens group G1, XGmin (2, 3, 4) is a minimum moving distance among moving distances of the second, third and fourth lens groups G2, G3 and G4, and XGmax (2, 3, 4) is a maximum moving distance among moving distances of the second, third and fourth lens groups G2, G3 and G4.
Example 5
An image pickup apparatus, as shown in fig. 1 to 12, comprising: a motion picture lens, and an image pickup element as described in any of the above embodiments, configured to receive an image formed by the motion picture lens.
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, various 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 (10)
1. The cinematographic lens is characterized by comprising a first lens group with positive focal power, a second lens group with negative focal power, a diaphragm, a third lens group with positive focal power, a fourth lens group with negative focal power and a fixed lens group with positive focal power in sequence from an object plane side to an image plane side;
the first lens group, the second lens group, the third lens group and the fourth lens group move along the optical axis direction of the cinematographic lens;
the first lens group consists of a first lens with negative focal power, a second lens with positive focal power and a third lens with positive focal power in sequence from the object plane side to the image plane side;
the second lens group consists of four lenses or five lenses, and the second lens group sequentially comprises a fourth lens with negative focal power, a fifth lens with negative focal power, one or two lenses with positive focal power and an eighth lens with negative focal power from the object plane side to the image plane side;
the third lens group comprises a ninth lens with positive focal power, a tenth lens with negative focal power, an eleventh lens with positive focal power, a twelfth lens with positive focal power and a thirteenth lens with negative focal power in sequence from the object plane side to the image plane side;
the fourth lens group is a fourteenth lens with negative focal power;
the fixed lens group consists of two lenses or four lenses, and the fixed lens group sequentially comprises one or two lenses with positive focal power and one or two lenses with negative focal power from the object plane side to the image plane side;
Ft/Fw＞2.5；
and Ft is the focal length of the film lens in a telephoto state, and Fw is the focal length of the film lens in a wide-angle state.
2. A motion picture lens as claimed in claim 1, wherein:
the movie lens meets the following conditional expression:
0.1＜Fw/Lw＜0.2；
0.35＜Ft/Lt＜0.55；
wherein Lw is the optical total length of the film lens in a wide-angle state, and Lt is the optical total length of the film lens in a telephoto state.
3. A motion picture lens as claimed in claim 1, wherein:
the movie lens meets the following conditional expression:
0.6＜φ5I/Y＜0.85；
and Y is the actual image height of the movie lens, and phi 5I is the outer diameter of the lens close to the image surface side in the fixed lens group.
4. A motion picture lens as claimed in claim 1, wherein:
the diaphragm is arranged on the object plane side of the third lens group and moves along the optical axis direction of the movie lens along with the third lens group.
5. A motion picture lens as claimed in claim 1, wherein:
the movie lens meets the following conditional expression:
XGmin(2，3，4)/XGmax(2，3，4)＜0.4；
wherein XGmin (2, 3, 4) is the smallest moving distance among the moving distances of the second, third, and fourth lens groups, and XGmax (2, 3, 4) is the largest moving distance among the moving distances of the second, third, and fourth lens groups.
6. The movie lens as claimed in claim 5, wherein:
the movie lens meets the following conditional expression:
XGmin(2，3，4)/XG1＜0.3；
XGmax(2，3，4)/XG1＞0.4；
wherein XG1 is a moving distance of the first lens group.
7. A motion picture lens as claimed in claim 1, wherein:
at least one group of cemented lenses is arranged in the second lens group;
and/or
At least one group of cemented lenses is arranged in the third lens group;
and/or
At least one group of cemented lenses is present in the fourth lens group.
8. A motion picture lens as claimed in claim 1, wherein:
the surface of the eighth lens close to the image surface side is a plane.
9. A motion picture lens as claimed in claim 1, wherein:
at most one lens of the fixed lens group is an aspheric lens.
10. An image pickup apparatus comprising:
the movie lens of any one of claims 1 to 9;
and an image pickup element configured to receive an image formed by the movie lens.
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| JP2007264395A (en) * | 2006-03-29 | 2007-10-11 | Canon Inc | Zoom lens and imaging apparatus equipped with the same |
| CN102109665A (en) * | 2009-12-25 | 2011-06-29 | 佳能株式会社 | Zoom lens and image pickup apparatus including the same |
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