CN114647061B - Film lens and imaging device - Google Patents
Film lens and imaging device Download PDFInfo
- Publication number
- CN114647061B CN114647061B CN202210139933.3A CN202210139933A CN114647061B CN 114647061 B CN114647061 B CN 114647061B CN 202210139933 A CN202210139933 A CN 202210139933A CN 114647061 B CN114647061 B CN 114647061B
- Authority
- CN
- China
- Prior art keywords
- lens
- lens group
- fixed
- focusing
- focal power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000003384 imaging method Methods 0.000 title claims abstract description 40
- 230000003287 optical effect Effects 0.000 claims abstract description 47
- 230000008859 change Effects 0.000 description 20
- 230000004075 alteration Effects 0.000 description 19
- 230000000694 effects Effects 0.000 description 19
- 238000000034 method Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- 206010010071 Coma Diseases 0.000 description 10
- 101150117587 pos5 gene Proteins 0.000 description 5
- 206010073261 Ovarian theca cell tumour Diseases 0.000 description 4
- 208000001644 thecoma Diseases 0.000 description 4
- 229910019250 POS3 Inorganic materials 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/0075—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having an element with variable optical properties
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention relates to the field of optics, in particular to a film lens and an imaging device. The film lens sequentially comprises the following components from an object plane side to an image plane side: the lens comprises a first fixed lens group with positive focal power, a first focusing lens group with negative focal power, a second fixed lens group with positive focal power, a second focusing lens group with positive focal power, a first movable lens group with negative focal power, a second movable lens group with positive focal power and a third fixed lens group with positive focal power; the first moving lens group and the second moving lens group move along the main optical axis direction of the film lens, and the first focusing lens group and the second focusing lens group move along the main optical axis direction of the film lens. The moving ranges of the first moving lens group and the second moving lens group are overlapped, the volume of the lens barrel required by the first moving lens group and the second moving lens group is reduced, and miniaturization of the film lens is realized.
Description
Technical Field
The invention relates to the field of optics, in particular to a film lens and an imaging device.
Background
The movie shot is just a movie shooting shot as the name implies. The film lens has the top optical quality, and the design of the mechanical structure of the film lens also fully considers the professional requirements of film production. Since these shots are specifically tailored to the film shooting environment, they may not be well suited for other applications. The installation of a focus-following toothed ring and the modification of an infinite aperture on a camera lens does not allow it to be converted into a film lens.
In order to respond to the development action plan of the national ultra-high definition video industry, the lens future will also comprehensively enter the ultra-high definition era according to the general technical route of '4K in advance and considering 8K'.
Because of the super-large number of lenses of the film lens, the imaging quality of the film lens is generally lower, the breathing effect of the film lens is obvious in the focusing process, the focus position is seriously deviated, the chromatic aberration and the coma aberration are larger, and the imaging quality of the film lens is lower.
Disclosure of Invention
The invention solves the prior technical problems, provides the film lens, overlaps the moving ranges of the first moving lens group and the second moving lens group, reduces the volume of the lens barrel required by the first moving lens group and the second moving lens group, and realizes the miniaturization of the film lens.
The technical scheme provided by the invention is as follows:
a cinema lens comprising, in order from an object plane side to an image plane side: the lens comprises a first fixed lens group with positive focal power, a first focusing lens group with negative focal power, a second fixed lens group with positive focal power, a second focusing lens group with positive focal power, a first movable lens group with negative focal power, a second movable lens group with positive focal power and a third fixed lens group with positive focal power;
The first moving lens group and the second moving lens group move along the main optical axis direction of the film lens, and the first focusing lens group and the second focusing lens group move along the main optical axis direction of the film lens.
In the technical scheme, through the arrangement of the first focusing lens group and the second focusing lens group in the front group, the zooming of the front group of the film lens is realized, the aberration and coma effects of the film lens are reduced, the imaging quality of the film lens is improved, and the 8K ultra-high definition imaging quality is realized; the large-magnification adjustment range of the film lens is realized through the arrangement of the first movable lens group and the second movable lens group; meanwhile, the first movable lens group and the second movable lens group are arranged together, the moving ranges of the first movable lens group and the second movable lens group are overlapped, the volume of a lens barrel required by the first movable lens group and the second movable lens group is reduced, and miniaturization of the film lens is realized.
Preferably, the second focusing lens group includes, in order from an object plane side to an image plane side: a negative focal power focusing lens and a positive focal power focusing lens.
In the technical scheme, the second movable lens group is provided with the bonding lens, the setting of the bonding lens increases the imaging quality of the film lens, the influence on the focal length of the film lens is small, the change of the angle of view of the film lens is realized, and the imaging effect of the film lens is increased.
Preferably, the first focusing lens group includes, in order from an object plane side to an image plane side: a first focusing lens of positive optical power, a second focusing lens of negative optical power, and a third focusing lens of negative optical power; the first focusing lens and the second focusing lens are glued;
the third fixed lens group sequentially comprises from an object plane side to an image plane side:
a fifth fixed lens of positive optical power, a sixth fixed lens of negative optical power, a seventh fixed lens of negative optical power, an eighth fixed lens of positive optical power, a ninth fixed lens of positive optical power, an eleventh fixed lens of negative optical power, a twelfth fixed lens of positive optical power, a thirteenth fixed lens of negative optical power, a fourteenth fixed lens of positive optical power, a fifteenth fixed lens of negative optical power, a sixteenth fixed lens of positive optical power; the fifth fixed lens is cemented with the sixth fixed lens, the seventh fixed lens is cemented with the eighth fixed lens, the eleventh fixed lens is cemented with the twelfth fixed lens, and the fourteenth fixed lens is cemented with the fifteenth fixed lens.
Preferably, the first focusing lens group includes, in order from an object plane side to an image plane side: a first focusing lens with positive focal power, a second focusing lens with negative focal power, a third focusing lens with negative focal power and a fourth focusing lens with positive focal power;
The third fixed lens group sequentially comprises from an object plane side to an image plane side:
a fifth fixed lens of positive power, a sixth fixed lens of negative power, a seventh fixed lens of negative power, an eighth fixed lens of positive power, a ninth fixed lens of positive power, a tenth fixed lens of negative power, an eleventh fixed lens of negative power, a twelfth fixed lens of positive power, a thirteenth fixed lens of negative power, a fourteenth fixed lens of positive power, a fifteenth fixed lens of negative power, a sixteenth fixed lens of positive power; the fifth fixed lens is cemented with the sixth fixed lens, the seventh fixed lens is cemented with the eighth fixed lens, the ninth fixed lens is cemented with the tenth fixed lens, the eleventh fixed lens is cemented with the twelfth fixed lens, and the fourteenth fixed lens is cemented with the fifteenth fixed lens.
Preferably, the first moving lens group includes, in order from an object plane side to an image plane side: a first moving lens of negative focal power, a second moving lens of negative focal power, and a third moving lens of positive focal power; the second moving lens and the third moving lens are glued;
and/or
The second movable lens group sequentially comprises the following components from the object plane side to the image plane side: a fourth moving lens of negative power, a fifth moving lens of positive power; the fourth moving lens and the fifth moving lens are cemented.
In the technical scheme, the first movable lens group and the second movable lens group can be used for adjusting the focal length of the film lens, and in the adjusting process, as at least one cemented lens is arranged in the first movable lens group and the second movable lens group, the aberration and coma of the film lens are further reduced, and the imaging quality of the film lens is improved.
Preferably, the first fixed lens group is a first fixed lens with positive focal power;
and/or
The second fixed lens group sequentially comprises from an object plane side to an image plane side: a second fixed lens with positive focal power, a third fixed lens with positive focal power and a fourth fixed lens with negative focal power.
In the technical scheme, the possibility that the aberration and the coma are generated by the light rays received by the second focusing lens group is further reduced through the gluing of the third fixed lens and the fourth fixed lens, and the imaging quality of the film lens is improved.
Preferably, a diaphragm is disposed between the sixth fixed lens and the seventh fixed lens.
In the technical scheme, when the diaphragm is arranged at the position, the diaphragm can be close to the middle position of the film lens, the distance between the upper light and the lower light is larger, and the aperture of the diaphragm is increased; when the diaphragm is arranged in the third fixed lens group, the first focusing lens group, the second focusing lens group, the first moving lens group and the second moving lens group are smaller in change amplitude of up and down light rays of the film lens when moving, so that the possibility of diaphragm change of the film lens is further reduced, and the effect of constant diaphragm of the film lens is realized.
Preferably, the first focusing lens group and/or the second focusing lens group are used for adjusting the object distance of the film lens.
In the technical scheme, the limitation of the functions of the first focusing lens group and/or the second focusing lens group reduces the possibility of focal length change of the film lens when the first focusing lens group and/or the second focusing lens group move, realizes the effect of changing the object distance of the film lens, and increases the application range of the film lens.
Preferably, the moving directions of the first focusing lens group and the second focusing lens group are the same.
In the technical scheme, through limiting the moving directions of the first focusing lens group and the second focusing lens group, the moving positions of the first focusing lens group and the second focusing lens group can be overlapped, so that the volume of the film lens is reduced; meanwhile, when the moving directions of the first focusing lens group and the second focusing lens group are the same, the change of the light path is reduced, and then the possibility of focal length change of the film lens is reduced.
Preferably, the moving distance of the first focusing lens group and/or the second focusing lens group is related to the object distance of the film lens;
and/or
The first moving lens group and the second moving lens group are used for adjusting the focal length of the film lens.
In the technical scheme, when the first focusing lens group and/or the second focusing lens group move, the first focusing lens group and/or the second focusing lens group need to move according to the size of the object distance, so that the possibility of focal length change of the film lens is further reduced; by defining the functions of the first moving lens group and the second moving lens group, the possibility of changing the focal length of the film lens when the film lens moves the first focusing lens group and the second focusing lens group is reduced.
Preferably, the first focusing lens group and the second focusing lens group satisfy the following conditional expression by fitting:
y＝a*x 2 +b*x+c；
wherein y is the distance between the first focusing lens group, the second focusing lens group and the adjacent fixed lens group or the virtual plane, x is 1000/object distance, a is a first focusing coefficient, b is a second focusing coefficient, and c is a third focusing coefficient.
In the technical scheme, the first focusing lens group and the second focusing lens group are related to each other in moving, the first focusing lens group and the second focusing lens group move in the lens cone in a parabolic track in moving, and the first focusing lens group and the second focusing lens group are inversely proportional to object distances, so that three focusing coefficients can be respectively determined according to different film lenses.
Preferably, the cinema lens consists of a spherical lens.
In the technical scheme, through the limitation of the structure, the use of the aspheric surface is reduced, the cost of the film lens is reduced, meanwhile, the possibility of generating aberration and coma in the film lens is also reduced, and the imaging quality of the film lens is improved.
Preferably, the movie shot satisfies the following conditional expression:
1000mm＞Umin＞600mm；
wherein, umin is the minimum object distance of the film lens.
In the technical scheme, through limiting the minimum object distance of the film lens, the possibility of overlarge intervals among the first focusing lens group, the second focusing lens group and the groups at two sides is reduced, and the miniaturization of the film lens is realized; while increasing the imaging quality of the cinematic shot by selection of the appropriate minimum object distance.
Preferably, the movie shot satisfies the following conditional expression:
TTL＜450mm；
wherein TTL is the total optical length of the film lens.
In the technical scheme, through limiting the optical total length of the film lens, the possibility of overlarge volume of the film lens is reduced, and the miniaturization of the film lens is realized.
Preferably, the movie shot satisfies the following conditional expression:
0.24＜Y1/TTL＜0.28；
wherein TTL is the total optical length of the film lens, and Y1 is the moving distance of the first moving lens group.
In the technical scheme, the zoom range of the film lens is enlarged to a certain extent through the limitation of the moving distance and the optical total length of the first moving lens group, the imaging quality of the film lens is increased, the ultrahigh definition resolution of the film lens is realized, the possibility of overlarge volume of the film lens is also reduced, and the miniaturization of the film lens is realized.
Preferably, the movie shot satisfies the following conditional expression:
1.1＜Y1/Y2＜1.5；
wherein Y2 is a movement distance of the second moving lens group.
In the technical scheme, the imaging quality of the film lens during zooming is further improved by limiting the moving distance of the second moving lens group.
Preferably, the movie shot satisfies the following conditional expression:
-3＜f4/f2＜-1；
wherein f2 is the focal length of the first focusing lens group, and f4 is the focal length of the second focusing lens group.
In the technical scheme, the definition of the focal length of the first focusing lens group and the focal length of the second focusing lens group reduces the possibility of total focal length and aperture variation of the film lens in the moving process of the focusing lens group, and then the effect of changing the angle of view of the focusing lens group is realized.
Preferably, the movie shot satisfies the following conditional expression:
-5＜f5/f6＜-3.5；
wherein f5 is the focal length of the first moving lens group, and f6 is the focal length of the second moving lens group.
In the technical scheme, through the definition of the focal lengths of the two movable lens groups, the possibility of generating aberration and coma in the moving process of the movable lens groups is reduced, and the imaging quality of the film lens during zooming is further improved.
Preferably, the movie shot satisfies the following conditional expression:
0.3＜LG7/TTL＜0.35；
Wherein LG7 is the optical total length of the third fixed lens group.
In the technical scheme, the limitation of the optical total length of the third fixed lens group further increases the correction of the aberration and the coma aberration of the optical path by the third fixed lens group, reduces the possibility that the difference between the upper light ray and the lower light ray of the light ray is overlarge, reduces the possibility of aperture change, and realizes the effect of constant aperture.
Preferably, the movie shot satisfies the following conditional expression:
Φmin(1,4)/φmax(1,4)＞0.9；
wherein Φmin (1, 4) is the outer diameter of the lens group with the smallest outer diameter among the first fixed lens group, the first focusing lens group, the second fixed lens group and the second focusing lens group, Φmax (1, 4) is the outer diameter of the lens group with the largest outer diameter among the first fixed lens group, the first focusing lens group, the second fixed lens group and the second focusing lens group.
In the technical scheme, through the limitation of the outer diameters of the first four groups, the possibility that the upper light and the lower light change too much in the moving process of the first focusing lens group and the second focusing lens group is reduced, the possibility of aperture change is reduced, and the effect of constant aperture is realized.
It is also an object of the present invention to provide an image forming apparatus including: movie shots; and an imaging element configured to receive an image formed by the cinema lens.
Compared with the prior art, the film lens and the imaging device provided by the invention have the following beneficial effects:
1. the second movable lens group is provided with a cemented lens, the cemented lens increases the imaging quality of the film lens, the influence on the focal length of the film lens is small, the change of the angle of view of the film lens is realized, the imaging effect of the film lens is increased, and the imaging effect of the film lens 8K is realized.
2. Through the arrangement of the lenses, the lens is matched with the second focusing lens group, so that the influence of the second focusing lens group on the focal length of the film lens in the moving process is further reduced, and the imaging effect of the film lens is improved.
3. The first movable lens group and the second movable lens group can be used for adjusting the focal length of the film lens, and in the adjusting process, as at least one cemented lens is arranged in the first movable lens group and the second movable lens group, the aberration and the coma of the film lens are further reduced, and the imaging quality of the film lens is improved.
4. When the diaphragm is arranged at the position, the diaphragm can be close to the middle position of the film lens, the distance between the upper light and the lower light is larger, and the aperture of the diaphragm is increased; when the diaphragm is arranged in the third fixed lens group, the first focusing lens group, the second focusing lens group, the first moving lens group and the second moving lens group are smaller in change amplitude of up and down light rays of the film lens when moving, so that the possibility of diaphragm change of the film lens is further reduced, and the effect of constant diaphragm of the film lens is realized.
Drawings
The above features, technical features, advantages and implementation of a film lens and imaging device will be further described in the following description of preferred embodiments with reference to the accompanying drawings in a clearly understandable manner.
FIG. 1 is a schematic diagram of a film shot according to the present invention;
FIG. 2 is a schematic diagram of another embodiment of a film shot according to the present invention;
fig. 3 is a schematic structural view of still another film shot according to the present invention.
Reference numerals illustrate: a1, a first fixed lens group; a2, a second fixed lens group; a3, a third fixed lens group; b1, a first focusing lens group; b2, a second focusing lens group; c1, a first movable lens group; c2, a second moving lens group; a1, a first fixed lens; a2, a second fixed lens; a3, a third fixed lens; a4, a fourth fixed lens; a5, a fifth fixed lens; a6, a sixth fixed lens; a7, a seventh fixed lens; a8, an eighth fixed lens; a9, a ninth fixed lens; a10, a tenth fixed lens; a11, eleventh fixed lens; a12, a twelfth fixed lens; a13, thirteenth fixed lens; a14, a fourteenth fixed lens; a15, a fifteenth fixed lens; a16, sixteenth fixed lens; b1, a first focusing lens; b2, a second focusing lens; b3, a third focusing lens; b4, a fourth focusing lens; b5, a fifth focusing lens; b6, a sixth focusing lens; c1, a first movable lens; c2, a second movable lens; c3, a third movable lens; c4, a fourth movable lens; c5, a fifth moving lens; STO, diaphragm.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
For simplicity of the drawing, only the parts relevant to the invention are schematically shown in each drawing, and they do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case.
Example 1
As shown in fig. 1-3, a film shot, comprising, in order from an object plane side to an image plane side: a first fixed lens group A1 of positive power, a first focusing lens group B1 of negative power, a second fixed lens group A2 of positive power, a second focusing lens group B2 of positive power, a first moving lens group C1 of negative power, a second moving lens group C2 of positive power, and a third fixed lens group A3 of positive power;
The first moving lens group C1 and the second moving lens group C2 move along the main optical axis direction of the movie lens, and the first focusing lens group B1 and the second focusing lens group B2 move along the main optical axis direction of the movie lens.
In this embodiment, by setting the first focusing lens group B1 and the second focusing lens group B2 in the front group, zooming of the front group of the film lens is achieved, and then effects of aberration and coma of the film lens are reduced, imaging quality of the film lens is increased, and then 8K ultra-high definition imaging quality is achieved; the large-magnification adjustment range of the film lens is realized through the arrangement of the first movable lens group C1 and the second movable lens group C2; meanwhile, the first movable lens group C1 and the second movable lens group C2 are arranged together, the moving ranges of the first movable lens group C1 and the second movable lens group C2 are overlapped, the volume of a lens barrel required by the first movable lens group C1 and the second movable lens group C2 is reduced, and miniaturization of a film lens is achieved.
The second focusing lens group B2 includes, in order from the object plane side to the image plane side: a negative focal power focusing lens and a positive focal power focusing lens.
In this embodiment, a cemented lens is disposed in the second focusing lens group B2, and the setting of the cemented lens increases the imaging quality of the movie lens, and has less influence on the focal length of the movie lens, thereby realizing the change of the angle of view of the movie lens, increasing the imaging effect of the movie lens, and realizing the imaging effect of the movie lens 8K.
The first focusing lens group B1 sequentially includes, from an object plane side to an image plane side: a first focusing lens b1 of positive power, a second focusing lens b2 of negative power, and a third focusing lens b3 of negative power; the first focusing lens b1 and the second focusing lens b2 are glued;
the third fixed lens group A3 sequentially includes, from an object plane side to an image plane side:
a fifth fixed lens a5 of positive power, a sixth fixed lens a6 of negative power, a seventh fixed lens a7 of negative power, an eighth fixed lens a8 of positive power, a ninth fixed lens a9 of positive power, an eleventh fixed lens a11 of negative power, a twelfth fixed lens a12 of positive power, a thirteenth fixed lens a13 of negative power, a fourteenth fixed lens a14 of positive power, a fifteenth fixed lens a15 of negative power, and a sixteenth fixed lens a16 of positive power; the fifth fixed lens a5 is cemented with the sixth fixed lens a6, the seventh fixed lens a7 is cemented with the eighth fixed lens a8, the eleventh fixed lens a11 is cemented with the twelfth fixed lens a12, and the fourteenth fixed lens a14 is cemented with the fifteenth fixed lens a 15.
Or (b)
The first focusing lens group B1 sequentially includes, from an object plane side to an image plane side: a first focusing lens b1 with positive focal power, a second focusing lens b2 with negative focal power, a third focusing lens b3 with negative focal power, and a fourth focusing lens b4 with positive focal power.
The third fixed lens group A3 sequentially includes, from an object plane side to an image plane side:
a fifth fixed lens a5 of positive power, a sixth fixed lens a6 of negative power, a seventh fixed lens a7 of negative power, an eighth fixed lens a8 of positive power, a ninth fixed lens a9 of positive power, a tenth fixed lens a10 of negative power, an eleventh fixed lens a11 of negative power, a twelfth fixed lens a12 of positive power, a thirteenth fixed lens a13 of negative power, a fourteenth fixed lens a14 of positive power, a fifteenth fixed lens a15 of negative power, and a sixteenth fixed lens a16 of positive power; the fifth fixed lens a5 is cemented with the sixth fixed lens a6, the seventh fixed lens a7 is cemented with the eighth fixed lens a8, the ninth fixed lens a9 is cemented with the tenth fixed lens a10, the eleventh fixed lens a11 is cemented with the twelfth fixed lens a12, and the fourteenth fixed lens a14 is cemented with the fifteenth fixed lens a 15.
The first moving lens group C1 includes, in order from an object plane side to an image plane side: a first movable lens c1 of negative power, a second movable lens c2 of negative power, and a third movable lens c3 of positive power; the second moving lens c2 and the third moving lens c3 are glued;
and/or
The second moving lens group C2 includes, in order from the object plane side to the image plane side: a fourth shift lens c4 of negative power, a fifth shift lens c5 of positive power; the fourth moving lens c4 and the fifth moving lens c5 are cemented.
In this embodiment, the first moving lens group C1 and the second moving lens group C2 can both adjust the focal length of the film lens, and in the adjusting process, since at least one cemented lens is disposed in the first moving lens group C1 and the second moving lens group C2, the aberration and coma of the film lens are further reduced, and the imaging quality of the film lens is increased.
The first fixed lens group A1 is a first fixed lens A1 with positive focal power;
and/or
The second fixed lens group A2 sequentially includes, from an object plane side to an image plane side: a second fixed lens a2 of positive power, a third fixed lens a3 of positive power, and a fourth fixed lens a4 of negative power.
In the present embodiment, by gluing the third fixed lens a3 and the fourth fixed lens a4, the possibility of generating aberration and coma aberration of the light received by the second focusing lens group B2 is further reduced, and the imaging quality of the film lens is increased.
The stop STO is disposed between the sixth fixed lens a6 and the seventh fixed lens a 7.
In this embodiment, when the stop STO is disposed at the above position, the stop STO can be close to the middle position of the film lens, the distance between the upper light and the lower light is larger, and the aperture of the aperture is increased; when the diaphragm STO is arranged in the third fixed lens group A3, the first focusing lens group B1, the second focusing lens group B2, the first moving lens group C1 and the second moving lens group C2 have smaller variation amplitude of up and down light rays of the film lens when moving, so that the possibility of diaphragm variation of the film lens is further reduced, and the effect of constant diaphragm of the film lens is realized.
Preferably, the first moving lens group C1 and the second moving lens group C2 are used to adjust the focal length of the movie lens.
In the present embodiment, by limiting the functions of the first moving lens group C1 and the second moving lens group C2, the possibility of changing the focal length of the movie lens when the movie lens moves the first focusing lens group B1 and the second focusing lens group B2 is reduced.
Preferably, the cinema lens consists of a spherical lens.
In this embodiment, by limiting the structure, the use of the aspheric surface is reduced, the cost of the film lens is reduced, meanwhile, the possibility of generating aberration and coma aberration in the film lens is also reduced, and the imaging quality of the film lens is improved.
Example 2
The present embodiment differs from embodiment 1 in the manner of movement of the focusing lens group.
On the basis of embodiment 1, in this embodiment, the first focusing lens group B1 and/or the second focusing lens group B2 are used to adjust the object distance of the movie lens.
Through the limitation of the functions of the first focusing lens group B1 and/or the second focusing lens group B2, the possibility of focal length change of the film lens when the first focusing lens group B1 and/or the second focusing lens group B2 move is reduced, the effect of changing the object distance of the film lens is realized, and the application range of the film lens is increased.
The moving directions of the first focusing lens group B1 and the second focusing lens group B2 are the same.
In this embodiment, by defining the moving directions of the first focusing lens group B1 and the second focusing lens group B2, the moving positions of the first focusing lens group B1 and the second focusing lens group B2 can be overlapped, so that the volume of the film lens is reduced; meanwhile, when the moving directions of the first focusing lens group B1 and the second focusing lens group B2 are the same, the change of the light path is reduced, and then the possibility of focal length change of the film lens is reduced.
The moving distance of the first focusing lens group B1 and/or the second focusing lens group B2 is related to the object distance of the film lens.
In this embodiment, the first focusing lens group B1 and/or the second focusing lens group B2 need to move according to the object distance when moving, so as to further reduce the possibility of focal length variation of the film lens.
The first focusing lens group B1 and the second focusing lens group B2 satisfy the following conditional expression by fitting:
y＝a*x 2 +b*x+c；
wherein y is the distance between the first focusing lens group B1, the second focusing lens group B2 and the adjacent fixed lens group or the virtual plane, x is 1000/object distance, a is a first focusing coefficient, B is a second focusing coefficient, and c is a third focusing coefficient.
In this embodiment, the first focusing lens group B1 and the second focusing lens group B2 are associated when moving, and all move in the lens barrel in a parabolic track when moving, and the first focusing lens group B1 and the second focusing lens group B2 are inversely proportional to the object distance, and the three focusing coefficients can be determined according to different film lenses respectively.
The movie shots satisfy the following conditional expression:
1000mm＞Umin＞600mm；
wherein, umin is the minimum object distance of the film lens.
In this embodiment, by limiting the minimum object distance of the film lens, the possibility of overlarge intervals between the first focusing lens group B1, the second focusing lens group B2 and the groups at two sides is reduced, and miniaturization of the film lens is realized; while increasing the imaging quality of the cinematic shot by selection of the appropriate minimum object distance.
Example 3
The present embodiment differs from embodiment 1 in the specific parameters of the movie shots.
On the basis of embodiment 1, in this embodiment, the movie lens satisfies the following conditional expression:
TTL＜450mm；
wherein TTL is the total optical length of the film lens.
In this embodiment, through the limitation of the optical total length of the film lens, the possibility of overlarge volume of the film lens is reduced, and miniaturization of the film lens is realized.
The movie shots satisfy the following conditional expression:
0.24＜Y1/TTL＜0.28；
wherein Y1 is a moving distance of the first moving lens group C1.
In this embodiment, through the limitation of the movement distance and the optical total length of the first moving lens group C1, the zoom range of the film lens is increased to a certain extent, the imaging quality of the film lens is increased, the ultra-high definition resolution of the film lens is realized, the possibility of overlarge volume of the film lens is also reduced, and the miniaturization of the film lens is realized.
The movie shots satisfy the following conditional expression:
1.1＜Y1/Y2＜1.5；
wherein Y2 is a moving distance of the second moving lens group C2.
The imaging quality of the cinema lens upon zooming is further increased by the definition of the moving distance of the second moving lens group C2.
The movie shots satisfy the following conditional expression:
-3＜f4/f2＜-1；
Wherein f2 is the focal length of the first focusing lens group B1, and f4 is the focal length of the second focusing lens group B2.
The definition of the focal length of the first focusing lens group B1 and the focal length of the second focusing lens group B2 reduces the possibility of the total focal length and aperture variation of the film lens in the moving process of the focusing lens group, and then the effect of changing the angle of view of the focusing lens group is realized.
The movie shots satisfy the following conditional expression:
-5＜f5/f6＜-3.5；
wherein f5 is the focal length of the first moving lens group C1, and f6 is the focal length of the second moving lens group C2.
In this embodiment, by defining the focal lengths of the two moving lens groups, the possibility of aberration and coma generated in the moving process of the moving lens groups is reduced, and the imaging quality of the film lens during zooming is further increased.
The movie shots satisfy the following conditional expression:
0.3＜LG7/TTL＜0.35；
wherein LG7 is the optical total length of the third fixed lens group A3.
By limiting the optical total length of the third fixed lens group A3, the correction of the aberration and coma aberration of the optical path by the third fixed lens group A3 is further increased, the possibility that the upper light ray and the lower light ray of the light ray are excessively different is also reduced, the possibility of aperture change is reduced, and the effect of constant aperture is realized.
The movie shots satisfy the following conditional expression:
Φmin(1,4)/φmax(1,4)＞0.9；
wherein Φmin (1, 4) is the outer diameter of the lens group with the smallest outer diameter among the first fixed lens group A1, the first focusing lens group B1, the second fixed lens group A2 and the second focusing lens group B2, Φmax (1, 4) is the outer diameter of the lens group with the largest outer diameter among the first fixed lens group A1, the first focusing lens group B1, the second fixed lens group A2 and the second focusing lens group B2.
In this embodiment, by limiting the outer diameters of the first four groups, the possibility that the upper light and the lower light change too much in the moving process of the first focusing lens group B1 and the second focusing lens group B2 is reduced, the possibility of aperture change is reduced, and the effect of constant aperture is realized.
Example 4
As shown in fig. 1, a film shot, comprising, in order from an object plane side to an image plane side: a first fixed lens group A1 of positive power, a first focusing lens group B1 of negative power, a second fixed lens group A2 of positive power, a second focusing lens group B2 of positive power, a first moving lens group C1 of negative power, a second moving lens group C2 of positive power, and a third fixed lens group A3 of positive power;
the first fixed lens group A1 is a first fixed lens A1 with positive focal power;
The first focusing lens group B1 sequentially includes, from an object plane side to an image plane side: a first focusing lens b1 of positive power, a second focusing lens b2 of negative power, and a third focusing lens b3 of negative power; the first focusing lens b1 and the second focusing lens b2 are glued;
the second fixed lens group A2 sequentially includes, from an object plane side to an image plane side: a second fixed lens a2 of positive power, a third fixed lens a3 of positive power, and a fourth fixed lens a4 of negative power; the third fixed lens a3 and the fourth fixed lens a4 are glued.
The second focusing lens group B2 includes, in order from the object plane side to the image plane side: the fourth fixed lens a4 of negative power and the fifth fixed lens a5 of positive power, the fourth fixed lens a4 and the fifth fixed lens a5 are cemented.
The first moving lens group C1 includes, in order from an object plane side to an image plane side: a first movable lens c1 of negative power, a second movable lens c2 of negative power, and a third movable lens c3 of positive power; the second moving lens c2 and the third moving lens c3 are glued;
the second moving lens group C2 includes, in order from the object plane side to the image plane side: a fourth shift lens c4 of negative power, a fifth shift lens c5 of positive power; the fourth moving lens c4 and the fifth moving lens c5 are cemented.
The third fixed lens group A3 sequentially includes, from an object plane side to an image plane side:
a fifth fixed lens a5 of positive power, a sixth fixed lens a6 of negative power, a seventh fixed lens a7 of negative power, an eighth fixed lens a8 of positive power, a ninth fixed lens a9 of positive power, an eleventh fixed lens a11 of negative power, a twelfth fixed lens a12 of positive power, a thirteenth fixed lens a13 of negative power, a fourteenth fixed lens a14 of positive power, a fifteenth fixed lens a15 of negative power, and a sixteenth fixed lens a16 of positive power; the fifth fixed lens a5 is cemented with the sixth fixed lens a6, the seventh fixed lens a7 is cemented with the eighth fixed lens a8, the eleventh fixed lens a11 is cemented with the twelfth fixed lens a12, and the fourteenth fixed lens a14 is cemented with the fifteenth fixed lens a 15.
The stop STO is disposed between the sixth fixed lens a6 and the seventh fixed lens a 7.
The basic lens data of the movie footage of this example are shown in table 1, and the variable parameters in table 1 are shown in tables 2 and 3.
The plane number column shows the plane number when the object-side plane is the 1 st plane and the number is increased one by one toward the image side; the surface type of a certain lens is shown in the surface type column; the curvature radius column shows the curvature radius of a certain lens, when the curvature radius is positive, the surface is bent towards the object side, and when the curvature radius is negative, the surface is bent towards the image side; the center thickness column shows the surface spacing on the optical axis of each surface from the surface adjacent to the image side thereof; 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, each column indicates a specific value of each variable parameter in different states when the movie lens moves in the first moving lens group C1 and the second moving lens group C2; in table 3, each column indicates a specific value of each variable parameter in different states and a focal length of the movie lens when the movie lens moves in the first focusing lens group B1 and the second focusing lens group B2.
[ Table 1 ]
/>
/>
[ Table 2 ]
| POS1 | POS2 | POS3 | POS4 | POS5 | |
| D1 | INF | INF | INF | INF | INF |
| D2 | 19.32 | 19.32 | 19.32 | 19.32 | 19.32 |
| D3 | 3.35 | 3.35 | 3.35 | 3.35 | 3.35 |
| D4 | 11.93 | 11.93 | 11.93 | 11.93 | 11.93 |
| D5 | 0 | 0 | 0 | 0 | 0 |
| D6 | 5.25 | 41.29 | 72.65 | 97.06 | 116.25 |
| D7 | 32.8 | 34.73 | 30.97 | 20.73 | 1.3 |
| D8 | 83.64 | 45.67 | 18.07 | 3.9 | 4.14 |
[ Table 3 ]
| POS5 | POS6 | POS7 | POS8 | |
| D1 | INF | 7511 | 3511 | 1311 |
| D2 | 19.32 | 17.4 | 15.45 | 10.09 |
| D3 | 3.35 | 5.27 | 7.22 | 12.58 |
| D4 | 11.93 | 11.03 | 9.76 | 5.89 |
| D5 | 0 | 0.9 | 2.17 | 6.04 |
| D6 | 5.25 | 5.25 | 5.25 | 5.25 |
| D7 | 32.8 | 32.8 | 32.8 | 32.8 |
| D8 | 83.64 | 83.64 | 83.64 | 83.64 |
In this example fw=72mm, ft=290 mm, fno=2.88, ttl= 446.01mm;
wherein fw is the focal length of the wide-angle end of the film lens, ft is the focal length of the telephoto end of the film lens, fno is the f-number of the film lens, and TTL is the total optical length of the film lens.
D2 has a fitted curve equation of y2=3.192×x 2 -14.52*x+19.31；
D3 fitting curve equation is y3= -3.192 x 2 -14.52*x+3.363；
D4 fitting curve equation is y4= -0.798 x 2 -7.352*x+11.94；
D5 fitted curve equation is y5=0.798×x 2 +7.352*x-0.028；
Wherein y2 to y4 are the distances between the first focusing lens group B1, the second focusing lens group B2 and the adjacent fixed lens group, y5 is the distance between the second lens group and the virtual plane, and x is 1000/object distance.
Y4=0 when the object distance of the movie shot is 710 mm.
Y1＝111mm，Y2＝79.5mm；Y1/Y2＝1.4；Y1/TTL＝0.249。
Wherein Y1 is a moving distance of the first moving lens group C1, and Y2 is a moving distance of the second moving lens group C2.
f2＝-104.93mm，f4＝290.05mm，f4/f2＝-2.76；
Wherein f2 is the focal length of the first focusing lens group B1, and f4 is the focal length of the second focusing lens group B2.
f5＝-55.93mm，f6＝223.67mm，f6/f5＝-4。
Wherein f5 is the focal length of the first moving lens group C1, and f6 is the focal length of the second moving lens group C2.
LG7＝150mm，LG7/TTL＝0.336；
Wherein LG7 is the optical total length of the third fixed lens group A3.
Φmin(1,4)＝ΦG2＝111.14mm，φmax(1,4)＝ΦG1＝119.58mm；
Φmin(1,4)/φmax(1,4)＝0.929；
Wherein Φmin (1, 4) is the outer diameter of the lens group with the smallest outer diameter among the first fixed lens group A1, the first focusing lens group B1, the second fixed lens group A2 and the second focusing lens group B2, Φmax (1, 4) is the outer diameter of the lens group with the largest outer diameter among the first fixed lens group A1, the first focusing lens group B1, the second fixed lens group A2 and the second focusing lens group B2.
Example 5
As shown in fig. 2, a film shot, comprising, in order from an object plane side to an image plane side: a first fixed lens group A1 of positive power, a first focusing lens group B1 of negative power, a second fixed lens group A2 of positive power, a second focusing lens group B2 of positive power, a first moving lens group C1 of negative power, a second moving lens group C2 of positive power, and a third fixed lens group A3 of positive power;
the first fixed lens group A1 is a first fixed lens A1 with positive focal power;
The first focusing lens group B1 sequentially includes, from an object plane side to an image plane side: a first focusing lens b1 of positive power, a second focusing lens b2 of negative power, a third focusing lens b3 of negative power, and a fourth focusing lens b4 of positive power;
the second fixed lens group A2 sequentially includes, from an object plane side to an image plane side: a second fixed lens a2 of positive power, a third fixed lens a3 of positive power, and a fourth fixed lens a4 of negative power.
The second focusing lens group B2 includes, in order from the object plane side to the image plane side: the fifth focusing lens b5 of negative power and the sixth focusing lens b6 of positive power, the fifth focusing lens b5 and the sixth focusing lens b6 are cemented.
The first moving lens group C1 includes, in order from an object plane side to an image plane side: a first movable lens c1 of negative power, a second movable lens c2 of negative power, and a third movable lens c3 of positive power; the second moving lens c2 and the third moving lens c3 are glued;
the second moving lens group C2 includes, in order from the object plane side to the image plane side: a fourth shift lens c4 of negative power, a fifth shift lens c5 of positive power; the fourth moving lens c4 and the fifth moving lens c5 are cemented.
The third fixed lens group A3 sequentially includes, from an object plane side to an image plane side:
a fifth fixed lens a5 of positive power, a sixth fixed lens a6 of negative power, a seventh fixed lens a7 of negative power, an eighth fixed lens a8 of positive power, a ninth fixed lens a9 of positive power, a tenth fixed lens a10 of negative power, an eleventh fixed lens a11 of negative power, a twelfth fixed lens a12 of positive power, a thirteenth fixed lens a13 of negative power, a fourteenth fixed lens a14 of positive power, a fifteenth fixed lens a15 of negative power, and a sixteenth fixed lens a16 of positive power; the fifth fixed lens a5 is cemented with the sixth fixed lens a6, the seventh fixed lens a7 is cemented with the eighth fixed lens a8, the ninth fixed lens a9 is cemented with the tenth fixed lens a10, the eleventh fixed lens a11 is cemented with the twelfth fixed lens a12, and the fourteenth fixed lens a14 is cemented with the fifteenth fixed lens a 15.
The stop STO is disposed between the sixth fixed lens a6 and the seventh fixed lens a 7.
The basic lens data of the movie footage of this example are shown in table 4, and the variable parameters in table 4 are shown in tables 5 and 6.
The plane number column shows the plane number when the object-side plane is the 1 st plane and the number is increased one by one toward the image side; the surface type of a certain lens is shown in the surface type column; the curvature radius column shows the curvature radius of a certain lens, when the curvature radius is positive, the surface is bent towards the object side, and when the curvature radius is negative, the surface is bent towards the image side; the center thickness column shows the surface spacing on the optical axis of each surface from the surface adjacent to the image side thereof; 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, each column indicates a specific value of each variable parameter in different states when the movie lens moves in the first moving lens group C1 and the second moving lens group C2; in table 6, each column indicates a specific value of each variable parameter in different states and a focal length of the movie lens when the movie lens moves in the first focusing lens group B1 and the second focusing lens group B2.
[ Table 4 ]
/>
[ Table 5 ]
[ Table 6 ]
| POS5 | POS6 | POS7 | POS8 | |
| D1 | INF | 2723.7 | 2000 | 1200 |
| D2 | 19.71 | 13.38 | 11.04 | 6.26 |
| D3 | 3.85 | 10.18 | 12.53 | 17.31 |
| D4 | 11.59 | 7.52 | 6.76 | 3.76 |
| D5 | 0 | 4.07 | 4.83 | 7.82 |
| D6 | 4.39 | 4.39 | 4.39 | 4.39 |
| D7 | 21.24 | 21.24 | 21.24 | 21.24 |
| D8 | 96.8 | 96.8 | 96.8 | 96.8 |
In this example fw=72 mm, ft=2918 mm, fno=2.88, ttl= 440.35mm;
wherein fw is the focal length of the wide-angle end of the film lens, ft is the focal length of the telephoto end of the film lens, fno is the f-number of the film lens, and TTL is the total optical length of the film lens.
D2 has a fitted curve equation of y2=2.675×x 2 -18.47*x+19.66；
D3 fitting curve equation is y3= -2.675 x 2 +18.47*x+3.905；
D4 fit curve equation is y4=1.886×x 2 -10.795*x+11.47；
D5 fit curve equation is y5= -1.886 x 2 +10.795*x-0.016；
Wherein y2 to y4 are the distances between the first focusing lens group B1, the second focusing lens group B2 and the adjacent fixed lens group, y5 is the distance between the second lens group and the virtual plane, and x is 1000/object distance.
Y4=0 when the object distance of the movie shot is 710 mm.
Y1＝113.03mm，Y2＝92.88mm；Y1/Y2＝1.22；Y1/TTL＝0.257。
Wherein Y1 is a moving distance of the first moving lens group C1, and Y2 is a moving distance of the second moving lens group C2.
f2＝-1.79mm，f4＝4.08mm，f4/f2＝-2.28；
Wherein f2 is the focal length of the first focusing lens group B1, and f4 is the focal length of the second focusing lens group B2.
f5＝-0.78mm，f6＝3.76mm，f6/f5＝-4.8。
Wherein f5 is the focal length of the first moving lens group C1, and f6 is the focal length of the second moving lens group C2.
LG7＝139.91mm，LG7/TTL＝0.318；
Wherein LG7 is the optical total length of the third fixed lens group A3.
Φmin(1,4)＝ΦG2＝113.61mm，φmax(1,4)＝ΦG1＝121.49mm；
Φmin(1,4)/φmax(1,4)＝0.935；
Wherein Φmin (1, 4) is the outer diameter of the lens group with the smallest outer diameter among the first fixed lens group A1, the first focusing lens group B1, the second fixed lens group A2 and the second focusing lens group B2, Φmax (1, 4) is the outer diameter of the lens group with the largest outer diameter among the first fixed lens group A1, the first focusing lens group B1, the second fixed lens group A2 and the second focusing lens group B2.
Example 6
As shown in fig. 3, a film shot, comprising, in order from an object plane side to an image plane side: a first fixed lens group A1 of positive power, a first focusing lens group B1 of negative power, a second fixed lens group A2 of positive power, a second focusing lens group B2 of positive power, a first moving lens group C1 of negative power, a second moving lens group C2 of positive power, and a third fixed lens group A3 of positive power;
the first fixed lens group A1 is a first fixed lens A1 with positive focal power;
The first focusing lens group B1 sequentially includes, from an object plane side to an image plane side: a first focusing lens b1 of positive power, a second focusing lens b2 of negative power, and a third focusing lens b3 of negative power; the first focusing lens b1 and the second focusing lens b2 are glued;
the second fixed lens group A2 sequentially includes, from an object plane side to an image plane side: the lens comprises a second fixed lens a2 with positive focal power, a third fixed lens a3 with positive focal power, a fourth fixed lens a4 with negative focal power, and the third fixed lens a3 and the fourth fixed lens a4 are glued.
The second focusing lens group B2 includes, in order from the object plane side to the image plane side: the fourth focusing lens b4 of negative power and the sixth focusing lens b6 of positive power, and the fifth focusing lens b5 and the sixth focusing lens b6 are cemented.
The first moving lens group C1 includes, in order from an object plane side to an image plane side: a first movable lens c1 of negative power, a second movable lens c2 of negative power, and a third movable lens c3 of positive power; the second moving lens c2 and the third moving lens c3 are glued;
the second moving lens group C2 includes, in order from the object plane side to the image plane side: a fourth shift lens c4 of negative power, a fifth shift lens c5 of positive power; the fourth moving lens c4 and the fifth moving lens c5 are cemented.
The third fixed lens group A3 sequentially includes, from an object plane side to an image plane side:
a fifth fixed lens a5 of positive power, a sixth fixed lens a6 of negative power, a seventh fixed lens a7 of negative power, an eighth fixed lens a8 of positive power, a ninth fixed lens a9 of positive power, an eleventh fixed lens a11 of negative power, a twelfth fixed lens a12 of positive power, a thirteenth fixed lens a13 of negative power, a fourteenth fixed lens a14 of positive power, a fifteenth fixed lens a15 of negative power, and a sixteenth fixed lens a16 of positive power; the fifth fixed lens a5 is cemented with the sixth fixed lens a6, the seventh fixed lens a7 is cemented with the eighth fixed lens a8, the eleventh fixed lens a11 is cemented with the twelfth fixed lens a12, and the fourteenth fixed lens a14 is cemented with the fifteenth fixed lens a 15.
The stop STO is disposed between the sixth fixed lens a6 and the seventh fixed lens a 7.
The basic lens data of the movie footage of this example is shown in table 7, and the variable parameters in table 7 are shown in tables 8 and 9.
The plane number column shows the plane number when the object-side plane is the 1 st plane and the number is increased one by one toward the image side; the surface type of a certain lens is shown in the surface type column; the curvature radius column shows the curvature radius of a certain lens, when the curvature radius is positive, the surface is bent towards the object side, and when the curvature radius is negative, the surface is bent towards the image side; the center thickness column shows the surface spacing on the optical axis of each surface from the surface adjacent to the image side thereof; 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, each column indicates a specific value of each variable parameter in different states when the movie lens moves in the first moving lens group C1 and the second moving lens group C2; in table 9, each column indicates a specific value of each variable parameter in different states and a focal length of the movie lens when the movie lens moves in the first focusing lens group B1 and the second focusing lens group B2.
[ Table 7 ]
/>
[ Table 8 ]
| POS1 | POS2 | POS3 | POS4 | POS5 | |
| D1 | INF | INF | INF | INF | INF |
| D2 | 17.99 | 17.99 | 17.99 | 17.99 | 17.99 |
| D3 | 3.53 | 3.53 | 3.53 | 3.53 | 3.53 |
| D4 | 11.65 | 11.65 | 11.65 | 11.65 | 11.65 |
| D5 | 0 | 0 | 0 | 0 | 0 |
| D6 | 4.82 | 41.91 | 74.8 | 100.74 | 121.32 |
| D7 | 27.32 | 31.49 | 29.28 | 20.05 | 1.3 |
| D8 | 93.13 | 51.86 | 21.19 | 4.48 | 2.65 |
[ Table 9 ]
| POS5 | POS6 | POS7 | POS8 | |
| D1 | INF | 7511 | 3511 | 1311 |
| D2 | 17.99 | 16.08 | 14.16 | 8.84 |
| D3 | 3.53 | 5.45 | 7.36 | 12.68 |
| D4 | 11.65 | 10.8 | 9.43 | 5.39 |
| D5 | 0 | 0.85 | 2.22 | 6.26 |
| D6 | 4.82 | 4.82 | 4.82 | 41.91 |
| D7 | 27.32 | 27.32 | 27.32 | 31.49 |
| D8 | 93.13 | 93.13 | 93.13 | 51.86 |
In this example fw=72 mm, ft=2918 mm, fno=2.88, ttl=446 mm;
wherein fw is the focal length of the wide-angle end of the film lens, ft is the focal length of the telephoto end of the film lens, fno is the f-number of the film lens, and TTL is the total optical length of the film lens.
D2 has a fitted curve equation of y2=1.916×x 2 -13.435*x+17.9；
D3 fitting curve equation is y3= -1.916 x 2 +13.435*x+3.62；
D4 fit curve equation is y4=0.8758×x 2 -8.941*x+11.81；
D5 fit curve equation is y5= -0.8758 x 2 +8.941*x-0.16；
Wherein y2 to y4 are the distances between the first focusing lens group B1, the second focusing lens group B2 and the adjacent fixed lens group, y5 is the distance between the second lens group and the virtual plane, and x is 1000/object distance.
Y4=0 when the object distance of the movie shot is 642 mm.
Y1＝116.5mm，Y2＝90.48mm；Y1/Y2＝1.29；Y1/TTL＝0.261。
Wherein Y1 is a moving distance of the first moving lens group C1, and Y2 is a moving distance of the second moving lens group C2.
f2＝-1.45mm，f4＝2.25mm，f4/f2＝-1.55；
Wherein f2 is the focal length of the first focusing lens group B1, and f4 is the focal length of the second focusing lens group B2.
f5＝-0.78mm，f6＝3.28mm，f6/f5＝-4.2。
Wherein f5 is the focal length of the first moving lens group C1, and f6 is the focal length of the second moving lens group C2.
LG7＝148.63mm，LG7/TTL＝0.333；
Wherein LG7 is the optical total length of the third fixed lens group A3.
Φmin(1,4)＝ΦG2＝111.83mm，φmax(1,4)＝ΦG1＝120.29mm；
Φmin(1,4)/φmax(1,4)＝0.93；
Wherein Φmin (1, 4) is the outer diameter of the lens group with the smallest outer diameter among the first fixed lens group A1, the first focusing lens group B1, the second fixed lens group A2 and the second focusing lens group B2, Φmax (1, 4) is the outer diameter of the lens group with the largest outer diameter among the first fixed lens group A1, the first focusing lens group B1, the second fixed lens group A2 and the second focusing lens group B2.
Example 7
An imaging apparatus, as shown in fig. 1-3, comprising: the motion picture footage described in any one of the embodiments above, and an imaging element configured to receive an image formed by the motion picture footage.
It should be noted that the above embodiments can be freely combined as needed. The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (9)
1. The film lens is characterized by comprising a first fixed lens group with positive focal power, a first focusing lens group with negative focal power, a second fixed lens group with positive focal power, a second focusing lens group with positive focal power, a first movable lens group with negative focal power, a second movable lens group with positive focal power and a third fixed lens group with positive focal power in sequence from an object plane side to an image plane side;
the first movable lens group and the second movable lens group move along the main optical axis direction of the film lens, and the first focusing lens group and the second focusing lens group move along the main optical axis direction of the film lens;
the second focusing lens group is composed of a cemented lens composed of a focusing lens with negative focal power and a focusing lens with positive focal power from the object plane side to the image plane side;
the first focusing lens group comprises a first focusing lens with positive focal power, a second focusing lens with negative focal power, a third focusing lens with negative focal power and a fourth focusing lens with positive focal power in sequence from the object plane side to the image plane side;
the first fixed lens group is a first fixed lens with positive focal power;
and
the second fixed lens group consists of a second fixed lens with positive focal power, a third fixed lens with positive focal power and a fourth fixed lens with negative focal power in sequence from the object plane side to the image plane side;
The third fixed lens group comprises a fifth fixed lens with positive focal power, a sixth fixed lens with negative focal power, a seventh fixed lens with negative focal power, an eighth fixed lens with positive focal power, a ninth fixed lens with positive focal power, a tenth fixed lens with negative focal power, an eleventh fixed lens with negative focal power, a twelfth fixed lens with positive focal power, a thirteenth fixed lens with negative focal power, a fourteenth fixed lens with positive focal power, a fifteenth fixed lens with negative focal power and a sixteenth fixed lens with positive focal power in sequence from the object plane side to the image plane side; the fifth fixed lens is cemented with the sixth fixed lens, the seventh fixed lens is cemented with the eighth fixed lens, the ninth fixed lens is cemented with the tenth fixed lens, the eleventh fixed lens is cemented with the twelfth fixed lens, the fourteenth fixed lens is cemented with the fifteenth fixed lens;
the first movable lens group consists of a first movable lens with negative focal power, a second movable lens with negative focal power and a third movable lens with positive focal power in sequence from the object plane side to the image plane side; the second moving lens and the third moving lens are glued;
and
the second movable lens group sequentially comprises a fourth movable lens with negative focal power and a fifth movable lens with positive focal power from the object plane side to the image plane side; the fourth moving lens and the fifth moving lens are glued;
The movie shots satisfy the following conditional expression:
1.1＜Y1/Y2＜1.5；
wherein Y1 is a movement distance of the first moving lens group, and Y2 is a movement distance of the second moving lens group.
2. A cinema lens according to claim 1, characterized in that:
the first focusing lens group and the second focusing lens group are used for adjusting the object distance of the film lens;
the moving distance of the first focusing lens group and the second focusing lens group is related to the object distance of the film lens;
and
the first moving lens group and the second moving lens group are used for adjusting the focal length of the film lens.
3. A cinema lens according to claim 2, characterized in that:
the first focusing lens group and the second focusing lens group satisfy the following conditional expression by fitting:
y＝a*x 2 +b*x+c；
wherein y is the distance between the first focusing lens group, the second focusing lens group and the adjacent fixed lens group or the virtual plane, x is 1000/object distance, a is a first focusing coefficient, b is a second focusing coefficient, and c is a third focusing coefficient.
4. A cinema lens according to claim 1, characterized in that:
the movie shots satisfy the following conditional expression:
0.24＜Y1/TTL＜0.28；
wherein TTL is the total optical length of the film lens.
5. A cinema lens according to claim 1, characterized in that:
the movie shots satisfy the following conditional expression:
-3＜f4/f2＜-1；
wherein f2 is the focal length of the first focusing lens group, and f4 is the focal length of the second focusing lens group.
6. A cinema lens according to claim 1, characterized in that:
the movie shots satisfy the following conditional expression:
-5＜f5/f6＜-3.5；
wherein f5 is the focal length of the first moving lens group, and f6 is the focal length of the second moving lens group.
7. A cinema lens according to claim 4, characterized in that:
the movie shots satisfy the following conditional expression:
0.3＜LG7/TTL＜0.35；
wherein LG7 is the optical total length of the third fixed lens group.
8. A cinema lens according to claim 1, characterized in that:
the movie shots satisfy the following conditional expression:
Φmin(1,4)/φmax(1,4)＞0.9；
wherein Φmin (1, 4) is the outer diameter of the lens group with the smallest outer diameter among the first fixed lens group, the first focusing lens group, the second fixed lens group and the second focusing lens group, and Φmax (1, 4) is the outer diameter of the lens group with the largest outer diameter among the first fixed lens group, the first focusing lens group, the second fixed lens group and the second focusing lens group.
9. An image forming apparatus, characterized in that: comprising the following steps:
A cinema lens according to any one of claims 1 to 8;
and an imaging element configured to receive an image formed by the cinema lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210139933.3A CN114647061B (en) | 2022-02-16 | 2022-02-16 | Film lens and imaging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210139933.3A CN114647061B (en) | 2022-02-16 | 2022-02-16 | Film lens and imaging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114647061A CN114647061A (en) | 2022-06-21 |
| CN114647061B true CN114647061B (en) | 2024-03-29 |
Family
ID=81993376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210139933.3A Active CN114647061B (en) | 2022-02-16 | 2022-02-16 | Film lens and imaging device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114647061B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019148679A (en) * | 2018-02-27 | 2019-09-05 | キヤノン株式会社 | Zoom lens and image capturing device having the same |
| CN113835204A (en) * | 2021-09-26 | 2021-12-24 | 嘉兴中润光学科技股份有限公司 | Film lens and imaging device |
-
2022
- 2022-02-16 CN CN202210139933.3A patent/CN114647061B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019148679A (en) * | 2018-02-27 | 2019-09-05 | キヤノン株式会社 | Zoom lens and image capturing device having the same |
| CN113835204A (en) * | 2021-09-26 | 2021-12-24 | 嘉兴中润光学科技股份有限公司 | Film lens and imaging device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114647061A (en) | 2022-06-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11520123B2 (en) | Optical photographing assembly having five lenses and specified abbe number | |
| US9541742B2 (en) | Wide-angle lens system and imaging apparatus employing the same | |
| CN101369048B (en) | Zoom lens, and optical apparatus and method for forming an image of an object using the zoom lens | |
| TW201942630A (en) | Photographing optical lens system, image capturing unit and electronic device | |
| CN107748433B (en) | Wide-angle exchangeable fixed-focus lens | |
| US10718930B2 (en) | Fixed focal length lens and image pickup apparatus | |
| US9435987B2 (en) | Zoom lens and electronic device including the same | |
| CN107884907B (en) | Imaging lens and optical device | |
| CN114063268A (en) | Image capturing lens system, image capturing device and electronic device | |
| CN103176265A (en) | Wide-angle zoom lens | |
| CN103869456B (en) | Lens devices and image pick-up device | |
| US8351128B2 (en) | Zoom lens and image pickup apparatus using the same | |
| CN111352211A (en) | Small-head high-resolution lens | |
| CN113359286A (en) | Film lens and image pickup device | |
| CN107884917B (en) | Variable magnification optical system and optical device | |
| JP5905883B2 (en) | Zoom lens and imaging device | |
| JP2012252253A (en) | Zoom lens and imaging device with the same | |
| CN114647061B (en) | Film lens and imaging device | |
| CN109387929B (en) | Zoom lens and image pickup apparatus | |
| WO2023005244A1 (en) | Zoom lens for projection | |
| CN113835204A (en) | Film lens and imaging device | |
| CN110412755B (en) | Zoom lens and imaging device | |
| CN108333733B (en) | Variable magnification optical system and optical device | |
| JP2018040948A (en) | Zoom lens | |
| CN216210202U (en) | Film lens and imaging device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |