CN213399039U - Deformable wide-screen lens and digital camera with same - Google Patents
Deformable wide-screen lens and digital camera with same Download PDFInfo
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- CN213399039U CN213399039U CN202022532710.2U CN202022532710U CN213399039U CN 213399039 U CN213399039 U CN 213399039U CN 202022532710 U CN202022532710 U CN 202022532710U CN 213399039 U CN213399039 U CN 213399039U
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Abstract
The utility model belongs to the technical field of optical devices, in particular to a deformable wide screen lens, which comprises a first lens group with negative diopter, a second lens group with positive diopter in the Y direction, a third lens group with diopter in the X direction and a fourth positive lens group with positive diopter in sequence from the object side to the image surface side; when an object moves from infinity to close range, the negative diopter lens closest to the image surface side of the first lens group moves to realize the focusing function; the diaphragm is arranged in the fourth positive lens group to satisfy the following conditional expression: Fy/Fzy is more than or equal to 0.3 and less than or equal to 0.8; the absolute value of Fzx/Fzy is less than or equal to 3; DA/DY is more than or equal to 1.05 and less than or equal to 1.5; the utility model provides a warp wide screen camera lens has high performance, small, low-cost advantage, and its deformation ratio is up to more than 1.5 times, possesses good close-up shooting ability simultaneously, through zooming the back, possess the oval facula of artistic creation demand.
Description
Technical Field
The utility model belongs to the technical field of optical device, concretely relates to warp wide screen camera lens and have its digital camera.
Background
In a digital camera system which has become widespread with the advance of high image quality of cameras in recent years, the number of screens is 4: 3 and 16: 9, but cinema screens are mostly 2.35: 1 and 2.6: 1, even a larger proportion, so that when playing, the length-width ratio can be achieved by up-down clipping to meet the visual habit of human eyes, and thus, the up-down clipping will lose a lot of effective pixels and reduce the image quality, so that the market demand for high-performance and high-compression-ratio anamorphic lenses is higher and higher.
As described in japanese patent laid-open No. 8-184759, a conventional anamorphic wide screen lens is configured such that a cylindrical lens group having an anamorphic ratio of 1.33 is located between the group 4G 4 and the group 5, and also between the aperture and the image plane, which is easy to miniaturize, but has a limited space and is difficult to realize large-magnification anamorphic, and because of the anamorphic reasons, the diameters of the light beams in the X and Y directions on the axis are different, which causes the difference between the X and Y directions of the aperture Fno, and the defocused light spot during shooting is elliptical, and during actual projection, the anamorphic wide screen lens is scaled to restore to a circular light spot, which does not meet the artistic creation requirement of the elliptical light spot generated by the anamorphic lens.
Further, as described in japanese patent laid-open No. 2005-221597, in embodiment 1, a cylindrical lens group having a distortion ratio of 1.33 times is disposed between the diaphragm and the image plane, and there is also an artistic creation requirement that the distortion ratio is small and an elliptical spot cannot be obtained, and although embodiment 2 places the cylindrical lens having the distortion function at the forefront, due to the characteristics of the cylindrical lens, the focal lengths in the horizontal X direction and the vertical Y direction are different, when the cylindrical lens is placed at the forefront, although the imaging point positions can be aligned infinitely, a good imaging effect is obtained, when the object is moved to a certain close distance, the focal lengths in the X and Y directions are different, and once the depth of field is exceeded, X is easily caused, and Y is rapidly degraded due to the fact that the imaging point positions are not aligned, so the close-up performance of the structure is poor.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome not enough among the prior art, provide a warp wide screen camera lens.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:
the utility model provides a wide screen camera lens warp, from the object side to image plane side in proper order including the first lens group of negative diopter, the Y direction possesses the second lens group cylinder group of positive diopter, the X direction possesses the third lens group cylinder group of diopter and possesses the fourth positive lens group of positive diopter; when an object moves from infinity to close range, the negative diopter lens closest to the image surface side of the first lens group moves to realize the focusing function;
the diaphragm is arranged in the fourth positive lens group to satisfy the following conditional expression:
0.3≤Fy/Fzy≤0.8 (1)
3≤|Fzx/Fzy| (2)
1.05≤DA/DY≤1.5 (3)
wherein:
fy: infinity state, the focal length in the Y direction of the entire optical system;
fzy: the focal length of the Y-direction diopter of the cylindrical lens group of the second lens group;
fzx: the focal length of X-direction diopter of the cylindrical lens group of the third lens group;
DA: the distance length from the side surface, closest to the object, of the cylindrical lens group of the second lens group to the side surface, closest to the image surface, of the cylindrical lens group of the third lens group;
DY: and the distance length from the most object-side surface of the cylindrical lens group of the second lens group to the most image-side surface.
The utility model discloses in, if exceed the lower limit of conditional expression (1), the diopter of the cylindrical mirror that is exactly is weak, though the performance is realized easily relatively, but will realize like this that the deformation ratio more than 1.5 times is than, can lead to the volume to become very huge, and is with high costs, and the cylindrical mirror is made difficultly. If the upper limit of the conditional expression (1) is exceeded, that is, the diopter of the cylindrical lens group in the Y direction is too strong, the miniaturization is easy, and the effect of the deformation ratio of 1.5 times or more is easily realized, but because the diopter is too strong, various aberrations are generated, the performance is difficult to be ensured, particularly astigmatism in the X and Y directions is easy to generate, and aberrations such as chromatic dispersion and coma aberration are increased sharply.
If the lower limit of the conditional expression (2) is exceeded, the diopter in the X direction of the cylindrical lens group of the third lens group is strong, the volume is easy to be reduced, and high-power deformation is realized, but the astigmatism in the X and Y directions is easy to be increased, so that the diopter in the X direction of the cylindrical lens group of the third lens group is weak, and the functions of correcting astigmatism and dispersion are achieved.
If the lower limit of the conditional expression (3) is exceeded, miniaturization is easily achieved, but the diopter of the cylindrical lens group of the second lens group is excessively strong, causing various aberrations, and it is difficult to ensure high performance. If the upper limit of the conditional expression (3) is exceeded, various aberrations can be corrected well, but the entire optical system becomes very bulky, and cannot be miniaturized, and the manufacturing is difficult.
Preferably, the anamorphic wide-screen lens further satisfies the following conditional expression:
0.5≤|F1b/Fy|≤1.6 (4)
wherein:
f1 b: the side, closest to the image surface, of the first lens group realizes the focal length of the lens with the focusing function through movement;
fy: infinity state, Y-direction focal length of the entire optical system.
The utility model discloses in, if exceed the lower limit of conditional expression (4), the diopter of focusing the group is too strong, though the close-up can be very close, the camera lens also can be miniaturized simultaneously, but because the diopter is too strong, can lead to various aberrations can't accomplish fine correction, and high performance is more difficult. If the upper limit of the conditional expression (4) is exceeded, the power of the focusing group is too weak, various aberrations are easily corrected, and high performance is relatively easy to realize, but the total volume of the optical system is increased due to a large increase in the amount of movement, and the near-field distance is relatively long, which makes commercialization difficult.
Preferably, the anamorphic wide-screen lens further satisfies the following conditional expression:
0.2≤|Fya/Fyb|≤0.7 (5)
wherein:
fya: the front part Ya of the cylindrical lens group of the second lens group has a focal length in the Y direction;
fyb: the rear part of the cylindrical lens group of the second lens group is the Y-direction focal length of Yb.
The utility model discloses in, if exceed the lower limit of conditional expression (5), anterior part Ya diopter of second lens group cylindrical lens group is too strong, though can miniaturize, realizes the deformation ratio of high magnification easily, nevertheless because diopter is too strong, produces various aberrations easily and hardly corrected, and high performance ization is more difficult. If the upper limit of the conditional expression (5) is exceeded, the front portion Ya of the second lens group is too weak in diopter, and it is easy to achieve high performance because various aberrations are easily corrected, but it is difficult to commercialize because of the large volume and high magnification ratio because of the too weak diopter.
The utility model also provides a digital camera of having above-mentioned wide screen camera lens of warping.
Compared with the prior art, the utility model discloses following technological effect has:
the utility model provides a warp wide screen camera lens has high performance, small, low-cost advantage, and its deformation ratio is up to more than 1.5 times, possesses good close-up shooting ability simultaneously, through zooming the back, possess the oval facula of artistic creation demand.
Other features and advantages of the present invention will be described in detail in the following detailed description.
Drawings
Fig. 1 is YZ and XZ views of an anamorphic wide-screen lens in example 1;
FIG. 2 is a view showing the spherical aberration, the field curvature aberration, the distortion aberration and the chromatic aberration of magnification in the Y direction and the X direction at infinity, a close distance in example 1;
fig. 3 is YZ and XZ views of an anamorphic wide-screen lens of embodiment 2;
FIG. 4 is a view showing the spherical aberration, the field curvature aberration, the distortion aberration and the chromatic aberration of magnification in the Y direction and the X direction at infinity and close distances in example 2;
fig. 5 is YZ and XZ views of an anamorphic wide-screen lens of embodiment 3;
FIG. 6 is a view showing the spherical aberration, the field curvature aberration, the distortion aberration and the chromatic aberration of magnification in the Y direction and the X direction at infinity, a close distance in example 3;
fig. 7 shows a specific shooting effect diagram of the deformable wide-screen lens provided by the present invention.
Detailed Description
In order to make the technical means, creation features, achievement purposes and effects of the present invention easy to understand, the present invention will be further clarified by the following specific drawings and embodiments.
Example 1
As shown in YZ and XZ views of fig. 1, the first lens group G1 having negative refractive power, the second lens group cylindrical lens group G2 having positive refractive power in the Y direction, the third lens group cylindrical lens group G3 having refractive power in the X direction, and the fourth positive lens group G4 having positive refractive power are included in this order from the object side to the image plane side; when an object moves from infinity to close distance, one negative diopter lens of the first lens group G1 closest to the image surface side moves to realize the focusing function; the stop S is disposed in the fourth positive lens group G4.
As shown in fig. 2, the spherical aberration, the field curvature aberration, the distortion aberration, and the chromatic aberration of magnification in the Y direction and the X direction at a short distance (object distance is 1500).
Data for example 1 are as follows
Rx (mm): radius of curvature of each surface in X direction
Ry (mm): radius of curvature of each surface in Y direction
D (mm): individual lens spacing and lens thickness
Nd: refractive index of each glass of d line
Vd: abbe number of glass
Focal point distance: fx-14.59 and Fy-29.03
Fno：2.9
Angle of semi-drawing ω x is 41.5 °, ω y is 16.7 °
| Distance of object | inf | 1500 |
| D(6) | 16.279 | 15.414 |
| D(8) | 4.000 | 4.865 |
Example 2
As shown in YZ and XZ views of fig. 3, the first lens group G1 having negative refractive power, the second lens group cylindrical lens group G2 having positive refractive power in the Y direction, the third lens group cylindrical lens group G3 having refractive power in the X direction, and the fourth positive lens group G4 having positive refractive power are included in this order from the object side to the image plane side; when an object moves from infinity to close distance, one negative diopter lens of the first lens group G1 closest to the image surface side moves to realize the focusing function; the stop S is disposed in the fourth positive lens group G4.
As shown in fig. 4, in example 2, spherical aberration, field curvature aberration, distortion aberration, and chromatic aberration of magnification are observed in the Y direction and the X direction at a short distance (object distance is 1500).
Data for example 2 are as follows
Rx (mm): radius of curvature of each surface in X direction
Ry (mm): radius of curvature of each surface in Y direction
D (mm): individual lens spacing and lens thickness
Nd: refractive index of each glass of d line
Vd: abbe number of glass
Focal point distance: fx-22.19 and Fy-44.04
Fno：2.05
Angle of semi-drawing ω x is 29.14 °, ω y is 11.39 °
| Distance of object | inf | 2000 |
| D(6) | 20.894 | 17.912 |
| D(8) | 1.907 | 4.888 |
Example 3
As shown in YZ and XZ views of fig. 5, the first lens group G1 having negative refractive power, the second lens group-cylindrical lens group G2 having positive refractive power in the Y direction, the third lens group-cylindrical lens group G3 having refractive power in the X direction, and the fourth positive lens group G4 having positive refractive power are included in this order from the object side to the image plane side; when an object moves from infinity to close distance, one negative diopter lens of the first lens group G1 closest to the image surface side moves to realize the focusing function; the stop S is disposed in the fourth positive lens group G4.
As shown in fig. 6, in example 3, spherical aberration, field curvature aberration, distortion aberration, and chromatic aberration of magnification are observed in the Y direction and the X direction at a short distance (object distance is 1500).
Data of example 3 are as follows
Rx (mm): radius of curvature of each surface in X direction
Ry (mm): radius of curvature of each surface in Y direction
D (mm): individual lens spacing and lens thickness
Nd: refractive index of each glass of d line
Vd: abbe number of glass
Focal point distance: fx-41.7 and Fy-83.02
Fno：2.05
Angle of semi-drawing ω x is 16.31 °, ω y is 6.13 °
| Distance of object | inf | 3860 |
| D(4) | 27.050 | 22.050 |
| D(6) | 4.755 | 9.755 |
The condition formula satisfies the condition:
| conditional formula (II) | Example 1 | Example 2 | Example 3 |
| (1)：0.3≤Fy/Fzy≤0.8 | 0.483 | 0.452 | 0.624 |
| (2)：3≤|Fzx/Fzy| | 4.55 | 46.48 | 3.53 |
| (3)：1.05≤DA/DY≤1.5 | 1.27 | 1.19 | 1.14 |
| (4)：0.5≤|F1b/Fy|≤1.6 | 1.36 | 1.21 | 0.84 |
| (5)：0.2≤|Fya/Fyb|≤0.7 | 0.44 | 0.39 | 0.51 |
The utility model provides a wide screen camera lens warp, overcome traditional camera lens and adopted the loss problem of a large amount of pixels that the cutting mode leads to in order to obtain the bigger wide screen effect of aspect ratio; or the deformation ratio is insufficient, and the artistic creation requirement of a larger length-width ratio effect cannot be achieved. The utility model provides a wide screen camera lens warp, realized that length-width deformation ratio is more than 1.5 times, the advantage of high performance, specific shooting effect is as shown in FIG. 7, the formation of image appears the horizontal compression on image plane after the circular object is shot, become oval image, also provide the oval facula that art creation needs simultaneously, because cylindrical mirror the place ahead sets up the group of focusing, the light angle that has guaranteed like this that the cylindrical mirror received is unchangeable all the time, can ensure long distance and closely can both realize good formation of image.
The foregoing shows and describes the general principles, essential features, and features of the invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the description of the above embodiments and the description is only illustrative of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the present invention, and these changes and modifications are all within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. The anamorphic wide-screen lens is characterized by comprising a first lens group (G1) with negative diopter, a second lens group and a cylindrical lens group (G2) with positive diopter in the Y direction, a third lens group and a cylindrical lens group (G3) with positive diopter in the X direction and a fourth positive lens group (G4) with positive diopter in sequence from the object side to the image surface side;
when an object moves from infinity to close distance, one negative diopter lens of the first lens group (G1) closest to the image surface side moves to realize the focusing function;
the diaphragm (S) is disposed within the fourth positive lens group (G4) so as to satisfy the following conditional expression:
0.3≤Fy/Fzy≤0.8 (1)
3≤|Fzx/Fzy| (2)
1.05≤DA/DY≤1.5 (3)
wherein:
fy: infinity state, the focal length in the Y direction of the entire optical system;
fzy: the focal length of the second lens group cylindrical lens group (G2) in the Y direction diopter;
fzx: a focal length of the third lens group (G3) in the X-direction diopter;
DA: a distance length from a most object-side surface of the second lens group-cylindrical lens group (G2) to a most image-side surface of the third lens group-cylindrical lens group (G3);
DY: and the distance length from the object side surface closest to the second lens group cylindrical lens group (G2) to the image surface side surface closest to the second lens group cylindrical lens group.
2. The anamorphic wide screen lens of claim 1, further satisfying the following conditional expression: 0.5 ≦ F1b/Fy ≦ 1.6 (4)
Wherein:
f1 b: the side closest to the image surface of the first lens group (G1) realizes the focal length of a lens of a focusing function by moving;
fy: infinity state, Y-direction focal length of the entire optical system.
3. The anamorphic wide screen lens of claim 1, further satisfying the following conditional expression: 0.2 ≦ Fya/Fyb ≦ 0.7 (5)
Wherein:
fya: the focal length in the Y direction of the front part Ya of the second lens group cylindrical lens group (G2);
fyb: the rear part Yb of the second lens group cylindrical lens group G2 has a Y-direction focal length.
4. A digital camera having the anamorphic wide screen lens of any one of claims 1-3.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113970842A (en) * | 2021-11-17 | 2022-01-25 | 广东至乐光学科技有限公司 | Deformable additional lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113970842A (en) * | 2021-11-17 | 2022-01-25 | 广东至乐光学科技有限公司 | Deformable additional lens |
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