CN207529006U - Wide-angle interchangeable tight shot - Google Patents
Wide-angle interchangeable tight shot Download PDFInfo
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- CN207529006U CN207529006U CN201721593829.2U CN201721593829U CN207529006U CN 207529006 U CN207529006 U CN 207529006U CN 201721593829 U CN201721593829 U CN 201721593829U CN 207529006 U CN207529006 U CN 207529006U
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Abstract
A kind of wide-angle interchangeable tight shot, including：The first eyeglass group, the second eyeglass group, diaphragm and the third eyeglass group set gradually from the object side to image side, wherein：First eyeglass group includes：The first lens with negative power, with positive light coke and cemented surface towards the third cemented doublet of object space；Second eyeglass group includes：The 4th eyeglass with positive light coke, with negative power and cemented surface towards the 5th cemented doublet of object space；Third eyeglass group includes：With the 6th cemented doublet of negative power and cemented surface towards image space, the 7th eyeglass with positive light coke；The spacing of second eyeglass group, diaphragm and third eyeglass group are fixed and formed can be along the zoom group that optical axis moves forward and backward；The present apparatus meets the 8k resolution ratio of matching silent frame and super35 picture film cameras, and camera lens whole process in object distance focussing process is changed distorts without dark angle, and under each object distance, and small, cell breath is faint, while has superelevation cost performance and machinability.
Description
Technical field
The utility model relates to a kind of technology in optical device field, specifically a kind of wide-angle interchangeable fixed-focus mirror
Head.
Background technology
Cinema scene is made to measure specifically for video captures such as film, TV plays, not only needs to match silent frame
Size sensor is examined with greater need for the physical condition synthesis that shooting video is combined in resolution ratio, optical aberration, cell breath etc.
Consider, while be also required to make overall plans in terms of weight and cost.Cinema scene not only possesses most top optics quality, Er Qieqi
The design of mechanical structure has also fully taken into account the professional needs of film making, thus its is professional very strong.But due to film
The design difficulty and manufacture difficulty of camera lens are very high, and there are no a companys at home so far to release electricity truly
Shadow camera lens for shooting.During camera lens is focused, a series of displacement can occur for internal lens set, by specific range
Incident light is focused on imaging surface.During coke is moved between multiple focuses, the displacement of camera lens interior lens group can change picture
Face visual field size, this phenomenon become cell breath.The major defect of cinema scene includes at present：1) resolution ratio is not high：Electricity at present
The resolution ratio of shadow video camera can reach 6K or 8K, but almost all of camera lens resolving power is not on the market
Height can not match high-resolution video camera and use；2) there is apparent dark angle：Due to optical reflection and the law of refraction limitation and
The limitation of camera lens plated film level, all camera lenses more or less can all have dark angle；And camera lens are not so good as film to the control at dark angle
Camera lens is harsh, therefore dark angle is obvious, can not meet video and film shooting uses；3) distortion is big：The picture of dynamic image
Distortion often seems to become apparent from than still photo, and pincushion or barrel distortion once will when dynamic element occurs in picture
Show shape at once, and can be more serious when the movement of video camera subjectivity visual angle；If the appearance within sweep of the eye of theater viewers is too
Apparent distortion, then be likely to result in movement vertigo；So the image field of cinema scene must be as straight as possible；And due to phase
Machine camera lens is often inadequate to the control of distortion, so can not meet high request of the cinema scene to distortion；4) cell breath is apparent：
Camera lens can generate cell breath during being focused, and cell breath is in addition to can not almost discover for camera lens
Except composition changes, picture is not influenced by cell breath；And it carries out chasing after coke or in difference for film making, in picture
The gimmick that coke is moved between main body is very common, so very high to the requirement for inhibiting cell breath, general camera lens can not meet
It is required that.
Utility model content
The utility model is directed to deficiencies of the prior art, proposes a kind of wide-angle interchangeable tight shot, full
The 8k resolution ratio of foot matching silent frame and super35 picture film cameras, camera lens are whole without dark in object distance focussing process is changed
Angle, and distort that small, cell breath is faint, while has superelevation cost performance and machinability under each object distance.
The utility model is achieved through the following technical solutions：
The utility model includes：The first eyeglass group for setting gradually from the object side to image side, the second eyeglass group, diaphragm and
Three eyeglass groups, wherein：First eyeglass group includes：The first lens with negative power, with positive light coke and cemented surface direction
The third cemented doublet of object space；Second eyeglass group includes：The 4th eyeglass with positive light coke, with negative power and cemented surface
Towards the 5th cemented doublet of object space；Third eyeglass group includes：With negative power and cemented surface towards the 6th glued of image space
Eyeglass, the 7th eyeglass with positive light coke；The spacing of second eyeglass group, diaphragm and third eyeglass group are fixed and formed can edge
The zoom group that optical axis moves forward and backward；When shooting object is from infinity to when closely changing, the first eyeglass group is fixed,
Second eyeglass group, diaphragm and third eyeglass group integrally move from image space to object space and are focused.
First lens use the eyeglass of eyeglass or monolithic of the two panels with negative power with negative power to realize,
Wherein：The eyeglass that monolithic has negative power helps to further improve image quality.
Technique effect
Compared with prior art, the utility model technique effect includes：
1) matched sensors are difficult to solve the problems, such as that existing camera lens resolution ratio is too low, the utility model is in camera lens
Glass aspheric eyeglass is added, has been obviously improved resolving power and resolution ratio, the utility model is made to disclosure satisfy that current market
The use of the professional 8K resolution cameras of upper highest resolution.
2) to solve the problems, such as that existing camera lens distortion is big, the utility model optimizes the structure and light path of camera lens, makes
Two group of eyeglass has symmetry about diaphragm as possible before and after diaphragm so that distortion is minimum, and TV distortion is 3% hereinafter, ensure that
Picture is not in deformation and distortion situation from center to periphery.
3) to solve the problems, such as that camera lens surrounding brightness is too low so as to dark angle occur, the utility model is used in design
It is designed with the angle of incidence of light that sensor matches, improves periphery light ratio.Even if when aperture standard-sized sheet, periphery is bright
Than the light by entire camera lens also more than 50%, is made to present evenly on picture, without dark angle in full object distance range.
4) to solve the problems, such as that existing camera lens cell breath is apparent, the utility model is whole using the subsequent group of diaphragm
The mode of mobile focusing.When shooting object is from infinity to when closely changing, pre-group is fixed, diaphragm and rear group together from
Image space is focused to object space overall movement.Particularly, diaphragm is in optimal in the process with forward and backward eyeglass apart from refocusing
Camera lens has been accomplished from when infinitely being focused on as far as minimum distance in position, and picture field angle changes within 3%, effectively weakens camera lens
Cell breath in focussing process.
Description of the drawings
Fig. 1 is 1 structure diagram of embodiment.
Fig. 2 for 1 camera lens of embodiment under the object distance of infinity relative to the spherical aberration, the curvature of field, distortion figure of d lines.
Fig. 3 for 1 camera lens of embodiment under the object distance of infinity relative to the coma figure of d lines.
Fig. 4 is 2 structure diagram of embodiment.
Fig. 5 for 2 camera lens of embodiment under the object distance of infinity relative to the spherical aberration, the curvature of field, distortion figure of d lines.
Fig. 6 for 2 camera lens of embodiment under the object distance of infinity relative to the coma figure of d lines.
Fig. 7 is 1 camera lens of embodiment MTF (being adjusted to transmission function) figure under the object distance of infinity.
Fig. 8 is 2 camera lens of embodiment MTF (being adjusted to transmission function) figure under the object distance of infinity.
In figure：First eyeglass group G1, the second eyeglass group G2, diaphragm STP, third eyeglass group G3, the first eyeglass L1, the second mirror
Piece L2, third cemented doublet L3, the 4th eyeglass L4, the 5th cemented doublet L5, the 6th cemented doublet L6, the 7th eyeglass L7, image planes
IMG。
Specific embodiment
Embodiment 1
As shown in Figure 1, the present embodiment includes：The first eyeglass group G1, the second eyeglass group set gradually from the object side to image side
G2, diaphragm STP and third eyeglass group G3, wherein：First eyeglass group G1 includes：Including the first eyeglass L1 with negative power
The first lens with the second eyeglass L2 with negative power, with positive light coke and cemented surface towards the third gluing mirror of object space
Piece L3；Second eyeglass group G2 includes：The 4th eyeglass L4 with positive light coke, with negative power and cemented surface towards object space
5th cemented doublet L5；Third eyeglass group G3 includes：With negative power and cemented surface towards image space the 6th cemented doublet L6,
The 7th eyeglass L7 with positive light coke；The spacing of second eyeglass group G2, diaphragm STP and third eyeglass group G3 are fixed and formed can
With the zoom group moved forward and backward along optical axis；When shooting object is from infinity to when closely changing, the first eyeglass group G1 consolidates
Fixed motionless, the second eyeglass group G2, diaphragm STP and third eyeglass group G3 are integrally moved from image space to object space and are focused.
The first eyeglass group G1 is positive light coke, for converging light, forms the field angle of demand；Second eyeglass group
G2 is positive light coke, for focusing and correcting spherical aberration, the curvature of field；Third eyeglass group G3 is positive light coke and eyeglass therein is excellent
Choosing is using aspherical lens, for further promoting image quality while reducing cell breath and distortion.
Any eyeglass group includes at least a piece of in first eyeglass group G1, the second eyeglass group G2 or third eyeglass group G3
Balsaming lens.
The total length of the wide-angle interchangeable tight shot and the ratio of the effective focal length of camera lens meet (4,5)；And
And the ratio of half image height of the camera lens of the total length and camera lens of wide-angle interchangeable tight shot meets (7,8).Work as lens length
It is excessive, it is reduced aberration although image quality can be improved, can cause that overall dimensions are excessive, and cost is excessively high；Lens length is too short, can make
Decline into image quality.
The total length of wide-angle interchangeable tight shot described in the present embodiment and the ratio of the effective focal length of camera lens are
4.47；The ratio of half image height of the total length of wide-angle interchangeable tight shot and the camera lens of camera lens is 7.67.
The diaphragm is to distance and the diaphragm of the nearly image side centre of surface of the second eyeglass group to the nearly object side table of third eyeglass group
The distance at face center and meet (5,12), the absolute value of the difference of the two meets (0,4) so that camera lens object distance is from infinitely as far as near
During distance changes, the field angle variation of camera lens is small.If less than the lower limit of the conditional, lens aperture diameter can be caused
Increase with entire outer diameter, difficulty promotion is made；If higher than the lower limit of the conditional, during lens focusing being led to, visual field
Angle variation is excessive, and cell breath is apparent.
Diaphragm described in the present embodiment is to the distance of the nearly image side centre of surface of the second eyeglass group and diaphragm to third eyeglass
The nearly object side surface center of group distance and be 5.63；Absolute value of the difference 0.34.
First eyeglass group, the second eyeglass group and the focal length of third eyeglass group and wide-angle interchangeable tight shot
The ratio of effective focal length meets (5,8), (3,5), (1,3) successively, that is, is assigned with the focal length proportioning of different eyeglass groups.From object space
To image space, eyeglass group focal length successively decreases step by step, is reduced so as to fulfill cell breath.
The first eyeglass group, the second eyeglass group and the focal length of third eyeglass group and wide-angle interchangeable described in the present embodiment
The ratio of the effective focal length of tight shot is followed successively by 6.5,3.8,1.5.
The optic back focal of the wide-angle interchangeable tight shot and the ratio of whole focal length meet (0.5,1.5), make
The focal length of camera lens and the ratio of rear coke are obtained in a suitable range.If less than the lower limit of the conditional, camera lens can be caused
Rear coke it is too short, it is difficult to match film camera on the market, reduce the versatility of camera lens；It is if upper higher than the conditional
Limit, then rear lens focus can be caused long, from it is infinite as far as closely focus when, the whole spherical aberration and coma mistake of the second eyeglass group G2
Greatly, image quality declines.
The optic back focal of wide-angle interchangeable tight shot described in the present embodiment and the ratio of whole focal length meet
(0.83,1.06)。
Preferably, the lens parameters in the present embodiment are specific as follows：
The EFL=35.0 of the present embodiment, TNO=1.6 (TNO is that camera lens calculates the f-number after transmitance).
Table 1
1 lens construction parameter of embodiment
Table 2
| POS1 | POS2 | |
| Z0 | INF | 350 |
| Z1 | 10.5 | 2.1 |
| Z2 | 38.5 | 30.1 |
| FOV | 31.2 | 30.5 |
Object distance from it is infinite as far as closely change during.FOV is the angle of half field-of view of camera lens, has only changed 2.2%, has exhaled
It is faint to inhale effect.
Embodiment 2
Compared with Example 1, the first lens in the present embodiment have the eyeglass of negative power, i.e. the first mirror using monolithic
Piece L1 is realized.The total length of wide-angle interchangeable tight shot in the present embodiment and the ratio of the effective focal length of camera lens are 4；Extensively
The ratio of half image height of the total length of angle interchangeable tight shot and the camera lens of camera lens is 6.48.
The diaphragm is to distance and the diaphragm of the nearly image side centre of surface of the second eyeglass group to the nearly object side table of third eyeglass group
Face center distance and be 11.98；Absolute value of the difference is 0.94.
First eyeglass group, the second eyeglass group and the focal length of third eyeglass group and wide-angle interchangeable tight shot
The ratio of effective focal length is followed successively by 5.4,4.7,2.2.
The optic back focal of the wide-angle interchangeable tight shot and the ratio of whole focal length are (0.89,1.13).
EFL=35mm in embodiment, TNO=1.6 (TNO is that camera lens calculates the f-number after transmitance).
The present embodiment by third eyeglass group finally a piece of eyeglass be changed to it is aspherical, for further reduce distortion.Simultaneously
Because aspherical image quality is promoted, it can further reduce by first eyeglass group's number of lenses.Compared to embodiment 1, this implementation
First eyeglass group of example is only 2 pieces of eyeglass compositions (comprising one piece of cemented doublet group).It can be seen that from the comparison of Fig. 7 and Fig. 8 non-
The reference of spherical surface so that the MTF of surrounding visual field is further promoted, it is ensured that higher image quality and stability.
Table 3
Lens construction parameter
Table 4
| POS1 | POS2 | |
| Z0 | INF | 350 |
| Z1 | 10.2 | 1.8 |
| Z2 | 39.6 | 31.2 |
| FOV | 31.4 | 30.7 |
Object distance from it is infinite as far as closely change during.FOV is the angle of half field-of view of camera lens, has only changed 2.2%, has exhaled
It is faint to inhale effect.
In order to improve whole image quality, the curvature of field and distortion are further eliminated, camera lens is counted into last piece of mirror from object plane
Piece becomes aspherical, and coefficient is as shown in table 3.
Table 5
Camera lens asphericity coefficient
The aspherical formula is：
Wherein：Z is aspherical
Along optical axis direction height be h position when, away from aspheric vertex of surface apart from rise sag；C=1/R, R represent the curvature of minute surface
Radius, K are circular cone coefficient conic, and A, B, C, D, E, F are high order aspheric surface coefficient, and the E in coefficient represents science count number,
Example E-005 represents 10-5。
Above-mentioned specific implementation can by those skilled in the art under the premise of without departing substantially from the utility model principle and objective with
Different modes carries out it local directed complete set, and the scope of protection of the utility model is subject to claims and not by above-mentioned specific
Implementation is limited, and each implementation within its scope is by the constraint of the utility model.
Claims (10)
1. a kind of wide-angle interchangeable tight shot, which is characterized in that including：The first eyeglass set gradually from the object side to image side
Group, the second eyeglass group, diaphragm and third eyeglass group, wherein：First eyeglass group includes：The first lens with negative power,
With positive light coke and cemented surface towards the third cemented doublet of object space；Second eyeglass group includes：The 4th with positive light coke
Eyeglass has the 5th cemented doublet of negative power and cemented surface towards object space；Third eyeglass group includes：With negative power and
Sixth cemented doublet of the cemented surface towards image space, the 7th eyeglass with positive light coke；Second eyeglass group, diaphragm and third eyeglass
The spacing of group is fixed and formed can be along the zoom group that optical axis moves forward and backward；When shooting object is from infinity to closely changing
When, the first eyeglass group is fixed, and whole moved from image space to object space of the second eyeglass group, diaphragm and third eyeglass group carries out
It focuses on；First lens are realized using the eyeglass of eyeglass or monolithic of the two panels with negative power with negative power.
2. wide-angle interchangeable tight shot according to claim 1, it is characterized in that, the first eyeglass group is positive light
Focal power for converging light, forms the field angle of demand；Second eyeglass group is positive light coke, for focusing and correcting sphere mapping
Difference, the curvature of field；Third eyeglass group is positive light coke and eyeglass therein is using aspherical lens, for reducing cell breath and distortion
While further promote image quality.
3. wide-angle interchangeable tight shot according to claim 1, it is characterized in that, the first eyeglass group, second
Any eyeglass group includes at least a piece of balsaming lens in eyeglass group or third eyeglass group.
4. wide-angle interchangeable tight shot according to claim 1, it is characterized in that, the wide-angle interchangeable fixed-focus
The total length of camera lens and the ratio of the effective focal length of camera lens meet (4,5)；And the total length of wide-angle interchangeable tight shot
Meet (7,8) with the ratio of half image height of the camera lens of camera lens.
5. wide-angle interchangeable tight shot according to claim 1, it is characterized in that, the diaphragm to the second eyeglass group
The distance of nearly image side centre of surface and diaphragm to the distance of third eyeglass group nearly object side surface center and satisfaction (5,12), the two
Absolute value of the difference meet (0,4).
6. wide-angle interchangeable tight shot according to claim 1, it is characterized in that, the first eyeglass group, second
The ratio of the effective focal length of the focal length of eyeglass group and third eyeglass group and wide-angle interchangeable tight shot meet successively (5,8),
(3,5)、(1,3)。
7. wide-angle interchangeable tight shot according to claim 1, it is characterized in that, the wide-angle interchangeable fixed-focus
The optic back focal of camera lens and the ratio of whole focal length meet (0.5,1.5).
8. wide-angle interchangeable tight shot according to claim 1, it is characterized in that, the first table of first eyeglass
Face is spherical surface, radius of curvature 20.86, thickness 1.07, refractive index 1.56, Abbe number 42.79；First mirror
The second surface of piece be spherical surface, radius of curvature 15.87, thickness 4.87；The first surface of second eyeglass is spherical surface,
Radius of curvature is -126.61, thickness 1.77, refractive index 1.21, Abbe number 74.94；The second of second eyeglass
Surface is spherical surface, radius of curvature 18.71, thickness 7.81；The first surface of third eyeglass be spherical surface, radius of curvature
It is 26, thickness 5.74, refractive index 1.66, Abbe number 41.38；The second surface of third eyeglass is spherical surface,
Radius of curvature is -12.1, thickness 1.32, refractive index 1.59, Abbe number 27.84；The third table of third eyeglass
Face is spherical surface, and radius of curvature is -56.02, thickness Z1；The first surface of 4th eyeglass is spherical surface, and radius of curvature is
Infinitely, thickness Z1；The second surface of 4th eyeglass be spherical surface, radius of curvature 22.5, thickness 2.84, reflect
Rate is 1.78, Abbe number 27.13；The first surface of 5th eyeglass is spherical surface, and radius of curvature is unlimited, and thickness is
1.81；The second surface of 5th eyeglass be spherical surface, radius of curvature 22.97, thickness 3.15, refractive index 1.43,
Its Abbe number is 57.84；The third surface of 5th eyeglass is spherical surface, and radius of curvature is -34.82, thickness 1.81, folding
It is 1.52 to penetrate rate, Abbe number 30.44；Diaphragm is spherical surface, thickness 2.51；The first surface of 6th eyeglass is spherical surface,
Its radius of curvature is -8.65, thickness 1.43, refractive index 1.72, Abbe number 24.89；The second of 6th eyeglass
Surface is spherical surface, radius of curvature 32.1, thickness 3.45, refractive index 1.46, Abbe number 54.86；6th
The third surface of eyeglass is spherical surface, and radius of curvature is -13.93, thickness 1.73；The first surface of 7th eyeglass is ball
Face, radius of curvature 33.97, thickness 3.04, refractive index 1.68, Abbe number 42.2；The of 7th eyeglass
Two surfaces are spherical surface, and radius of curvature is -18.6, thickness Z2.
9. wide-angle interchangeable tight shot according to claim 1, it is characterized in that, the 7th eyeglass is aspherical
Mirror, aspherical formula are：Its
In：When Z is the position that the aspherical height along optical axis direction is h, away from aspheric vertex of surface apart from rise sag；C=1/R, R table
Show the radius of curvature of minute surface, K is circular cone coefficient conic, and A, B, C, D, E, F are high order aspheric surface coefficient.
10. the wide-angle interchangeable tight shot according to claim 1 or 9, it is characterized in that, the of first eyeglass
One surface be spherical surface, radius of curvature 45.62, thickness 5.07, refractive index 1.93, Abbe number 32.7；The
The second surface of one eyeglass be spherical surface, radius of curvature 34.31, thickness 11.89；The first surface of third eyeglass is ball
Face, radius of curvature 72.04, thickness 14.04, refractive index 1.63, Abbe number 47.6；The of third eyeglass
Two surfaces are spherical surface, and radius of curvature is -41.12, thickness 3.11, refractive index 1.91, Abbe number 20.3；The
The third surface of three eyeglasses be spherical surface, radius of curvature 152.14, thickness Z1；The first surface of 4th eyeglass is ball
Face, radius of curvature are unlimited, thickness Z1；The second surface of 4th eyeglass is spherical surface, and radius of curvature 62.6 is thick
It is 7.03 to spend, refractive index 1.81, Abbe number 27.7；The first surface of 5th eyeglass is spherical surface, and radius of curvature is
Infinitely, thickness 2.59；The second surface of 5th eyeglass be spherical surface, radius of curvature 64.87, thickness 6.54,
Refractive index is 1.73, Abbe number 64.5；The third surface of 5th eyeglass is spherical surface, and radius of curvature is -110.71, thick
It is 2.51 to spend, refractive index 1.76, Abbe number 46.9；Diaphragm is spherical surface, and radius of curvature is unlimited, and thickness is
6.46；The first surface of 6th eyeglass is spherical surface, and radius of curvature is -27.69, thickness 4.05, refractive index 1.55,
Its Abbe number is 33.4；The second surface of 6th eyeglass be spherical surface, radius of curvature 80.3, thickness 9.41, reflect
Rate is 1.83, Abbe number 56.4；The third surface of 6th eyeglass is spherical surface, and radius of curvature is -55.16, and thickness is
3.45；The first surface of 7th eyeglass is aspherical, radius of curvature 89.33, and thickness 8.32, refractive index is
1.85, Abbe number 45.5；The second surface of 7th eyeglass is aspherical, and radius of curvature is -50.33, thickness Z2；
The first surface of 7th eyeglass, circular cone coefficient for 0, the second surface of the 7th eyeglass, circular cone coefficient be 0；7th eyeglass
First surface, quadravalence asphericity coefficient are -3.25E-03, and the second surface of the 7th eyeglass, quadravalence asphericity coefficient is 1.75E-
03；The first surface of 7th eyeglass, six rank asphericity coefficients are 5.12E-06, and the second surface of the 7th eyeglass, six ranks are aspherical
Coefficient is -5.18E-04；The first surface of 7th eyeglass, eight rank asphericity coefficients be -4.17E-07, the second table of the 7th eyeglass
Face, eight rank asphericity coefficients are 3.65E-06；The first surface of 7th eyeglass, ten rank asphericity coefficients be -2.03E-05, the 7th
The second surface of eyeglass, ten rank asphericity coefficients are -3.26E-08.
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| CN107748433A (en) * | 2017-11-24 | 2018-03-02 | 嘉兴中润光学科技有限公司 | Wide-angle interchangeable tight shot |
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