CN113485000A - Ultra-small deformable wide-screen lens and digital camera and video camera with same - Google Patents
Ultra-small deformable wide-screen lens and digital camera and video camera with same Download PDFInfo
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- CN113485000A CN113485000A CN202110764564.2A CN202110764564A CN113485000A CN 113485000 A CN113485000 A CN 113485000A CN 202110764564 A CN202110764564 A CN 202110764564A CN 113485000 A CN113485000 A CN 113485000A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/177—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
Abstract
The invention belongs to the technical field of optical devices, and particularly relates to a subminiature deformable wide-screen lens and a digital camera or a video camera with the subminiature deformable wide-screen lens, which sequentially comprise a first lens group with negative diopter, a focusing group with negative diopter, a cylindrical lens group in the Y direction, a cylindrical lens group in the X direction and a positive lens group from an object side to an image surface side; when an object moves from infinity to close range, the negative diopter focusing group moves to realize the focusing function, the Y-direction cylindrical lens group consists of a positive lens and a negative lens, and the X-direction cylindrical lens group consists of a negative lens and a positive lens; the invention can realize the deformation ratio of 1.3-1.55 times, and simultaneously realize the advantages of subminiature structure, high performance and low cost, and the imaging of the round object after shooting is horizontally compressed on the image surface to form an elliptical image, thereby providing elliptical light spots required by artistic creation; because the focusing group is arranged in front of the cylindrical mirror, the angle of light received by the cylindrical mirror is always unchanged, and good imaging can be realized at long distance and short distance.
Description
Technical Field
The invention belongs to the technical field of optical devices, and particularly relates to a subminiature deformable wide-screen lens and a digital camera or a video camera with the subminiature deformable wide-screen lens.
Background
In recent years, with the continuous advance of high image quality of movie cameras, the system of digital cameras which is gradually popularized has the formats of 3:2 and 16:9, but the cinema screen is 2.35:1 or even larger, so that during playing, the aspect ratio can be achieved by up-down clipping to meet the visual habit of human eyes, and thus the up-down clipping loses many effective pixels and reduces the image quality, so that the market demand for high-performance and high-compression-ratio deformable 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 lens is scaled and restored 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 disclosed in chinese patent publication No. CN211123457U, an anamorphic lens is disclosed, wherein a cylindrical lens group having an anamorphic ratio of 1.33 times is disposed at the front end of an object, and although the imaging points in the X and Y directions are identical in position to obtain a good imaging effect, when the object is moved to a certain distance, the focal lengths in the X and Y directions are different, which inevitably causes the positions of the imaging points to be different, once the depth of field is exceeded, it is easy to cause X, and the performance of Y is rapidly reduced due to the position of the imaging point being different, so the close-up performance of the lens structure is poor, and meanwhile, because the cylindrical lens is disposed at the front end, the size is not easy to control, and the cylindrical lens, no matter whether a wide-angle or a telephoto lens, is large in size, difficult to manufacture, and high in cost.
Disclosure of Invention
The invention aims to solve the problem that a traditional lens loses a large number of pixels due to the fact that a cutting mode is adopted to obtain a wide screen effect with a larger length-width ratio, or the problem of the artistic creation requirement that the larger length-width ratio effect cannot be achieved due to insufficient deformation ratio, and provides a subminiature deformable wide screen lens which can achieve the deformation ratio in the range of 1.3-1.55 times and simultaneously achieve the characteristics of subminiature structure and high performance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a subminiature deformable wide-screen lens comprises a first lens group G1 with negative diopter, a negative diopter focusing group F, a Y-direction cylindrical lens group YZ, an X-direction cylindrical lens group XZ and a positive lens group G3 in sequence from an object side to an image surface side;
when an object moves from infinity to close range, the negative diopter focusing group F moves to realize the focusing function, the Y-direction cylindrical lens group YZ consists of a positive lens and a negative lens, the X-direction cylindrical lens group XZ consists of a negative lens and a positive lens, and the following conditional expressions are satisfied:
1.0≤|Fy/F|≤5.0 (1)
1.5≤LZ/XI≤4.0 (2)
0.2≤LZ/L≤0.5 (3)
wherein, Fy: infinity state, the focal length in the Y direction of the entire optical system;
f: the focal distance of the negative diopter focusing group F;
and (3) LZ: the total length from the first surface of the Y-direction cylindrical lens group YZ on the object side to the last surface of the X-direction cylindrical lens group XZ on the image surface side;
l: the length of the entire optical system;
XI: paraxial image height in the X direction, and XI ═ tan (ω X) × Fx, where ω X is the half-picture angle in the X direction; fx is an infinite state, and the focal length in the X direction of the entire optical system.
In the present invention, the X direction refers to the horizontal direction, and the Y direction refers to the vertical direction.
Further, the anamorphic wide-screen lens further satisfies the following conditional expression:
4.5≤LZ/YI×ANA≤9.0 (4)
wherein, LZ: the total length from the first surface of the Y-direction cylindrical lens group YZ on the object side to the last surface of the X-direction cylindrical lens group XZ on the image surface side;
YI: paraxial image height in the Y direction, and YI ═ tan (ω Y) × Fy, where ω Y is the half-line angle in the Y direction;
ANA: the deformation ratio of the Y direction and the X direction, and ANA is Fy/Fx, wherein Fy is an infinite state, and the focal length of the whole optical system in the Y direction; fx is an infinite state, and the focal length in the X direction of the entire optical system.
Further, the anamorphic wide-screen lens further satisfies the following conditional expression:
0.5≤|Fzy/L|≤1.5 (5)
wherein, Fzy: the focal point distance of the Y-direction cylindrical lens group YZ;
l: the length of the entire optical system.
If the lower limit of the conditional expression (1) is exceeded, the diopter of the focusing group F is weak, the performance is relatively easy to realize, but the long movement amount is needed to realize the close-distance focusing function, the whole optical volume is enlarged, the ultra-small design target cannot be realized, and the cost is high. If the upper limit of the conditional expression (1) is exceeded, the diopter of the focusing group F is too strong, and miniaturization is easy to achieve, but various aberrations are difficult to correct, and it is difficult to achieve a high-performance design goal.
If the lower limit of the conditional expression (2) is exceeded, the volume of the cylindrical lens group is small, and although miniaturization is easily achieved, it is difficult to achieve a desired distortion ratio. If the upper limit of the conditional expression (2) is exceeded, the required deformation ratio is easily achieved, but the volume of the cylindrical mirror becomes large, it is difficult to achieve a small volume requirement, and the manufacturing cost also becomes high.
If the lower limit of the conditional expression (3) is exceeded, the entire optical length will be large, and high performance can be easily achieved, but the volume is large, and it is difficult to achieve a high-magnification deformation ratio because the volume ratio of the cylindrical mirror is too small. If the upper limit of the conditional expression (3) is exceeded, although the distortion ratio can be easily realized, the entire optical system becomes very large in diameter due to the large size of the cylindrical mirror, and the entire optical system becomes very large in size and cannot be miniaturized, and the manufacturing is difficult.
If the lower limit of the conditional expression (4) is exceeded, the requirements of good volume compactness and high distortion ratio are easily achieved, but since the distortion ratio is too strong, various aberration corrections become difficult, and it is difficult to achieve high performance. If the upper limit of the conditional expression (4) is exceeded, the optical performance can be easily corrected, and high performance can be easily realized, but the cylindrical lens group becomes bulky and miniaturization is difficult to realize.
If the lower limit of the conditional expression (5) is exceeded, the diopter of the cylindrical lens group in the Y direction becomes strong, and although a high distortion ratio is easily realized, the total length of the optical system also becomes large, so that various aberrations are hardly corrected because the diopter of the cylindrical lens in the Y direction is too strong, and the optical system also becomes bulky, and miniaturization is hardly realized. If the power exceeds the upper limit of the conditional expression (5), the reduction in size is easy and the performance is relatively easy, but it is difficult to realize a high power ratio because the power of the cylindrical mirror in the Y direction is too weak.
The invention also provides a digital camera which is provided with the ultra-small deformable wide-screen lens.
The invention also provides a digital camera which is provided with the ultra-small deformable wide-screen lens.
Compared with the prior art, the invention has the following technical effects:
the deformable wide-screen lens provided by the invention can realize the deformation ratio of 1.3-1.55 times, and simultaneously realize the advantages of ultra-small structure, high performance and low cost, the shooting effect can be shown by referring to fig. 1, the image of a round object after being shot is horizontally compressed on the image surface to form an oval image, and simultaneously, oval light spots required by artistic creation are also provided; in addition, the focusing group is arranged in front of the cylindrical mirror, so that the angle of light received by the cylindrical mirror is always unchanged, and good imaging can be realized at both long distance and short distance.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
Fig. 1 is a schematic diagram of a round object photographed based on the anamorphic wide-screen lens provided by the present invention after imaging;
FIG. 2 is a view showing YZ and XZ in example 1 of the present invention;
fig. 3 shows 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 the infinity, the close distance, according to embodiment 1 of the present invention;
FIG. 4 is a view showing YZ and XZ in example 2 of the present invention;
fig. 5 shows 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 the near distance, which are infinity in embodiment 2 of the present invention;
FIG. 6 is a view showing YZ and XZ in example 3 of the present invention;
fig. 7 shows spherical aberration, curvature of field aberration, distortion aberration, and chromatic aberration of magnification in the Y direction and the X direction at the near distance, which are infinity in embodiment 3 of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further clarified by combining the specific drawings.
Fig. 1 is a schematic diagram of a round object photographed based on the anamorphic wide-screen lens provided by the present invention after imaging; the round object is imaged after being shot and is horizontally compressed on an image surface to form an oval image, and meanwhile, oval light spots required by art creation are provided.
The following describes the advantages of the anamorphic wide-screen lens according to the present invention with reference to specific embodiments.
Example 1
The YZ and XZ views of the anamorphic wide screen lens provided in embodiment 1 shown in figure 2,
the optical lens comprises a first lens group G1 with negative diopter, a focusing group F with negative diopter, a cylindrical lens group YZ in the Y direction, a cylindrical lens group XZ in the X direction and a positive lens group G3 in sequence from the object side to the image side; when an object moves from infinity to close range, the negative diopter focusing group F moves to realize the focusing function, the Y-direction cylindrical lens group YZ consists of a positive lens and a negative lens, and the X-direction cylindrical lens group XZ consists of a negative lens and a positive lens.
As shown in fig. 3, the infinity, the Y-direction and the X-direction spherical aberration at the close distance, the field curvature aberration, the distortion aberration and the chromatic aberration of magnification of example 1 are shown.
The data for example 1 is as follows:
rx (mm): the radius of curvature of each surface in the X direction;
ry (mm): the radius of curvature of each surface in the Y direction;
d (mm): lens spacing and lens thickness;
nd: refractive index of each glass of d-line;
vd: abbe number of the glass;
focal point distance: fx ═ 14.46, Fy ═ 21.81;
Fno：2.87；
half-picture angle: ω x is 41.75 °, ω y is 21.14 °;
example 2
The YZ and XZ views of the anamorphic wide screen lens provided in embodiment 2 shown in figure 4,
the optical lens comprises a first lens group G1 with negative diopter, a focusing group F with negative diopter, a cylindrical lens group YZ in the Y direction, a cylindrical lens group XZ in the X direction and a positive lens group G3 in sequence from the object side to the image side; when an object moves from infinity to close range, the negative diopter focusing group F moves to realize the focusing function, the Y-direction cylindrical lens group YZ consists of a positive lens and a negative lens, and the X-direction cylindrical lens group XZ consists of a negative lens and a positive lens.
As shown in fig. 5, the infinity, the Y-direction and the X-direction spherical aberration at the close distance, the field curvature aberration, the distortion aberration and the chromatic aberration of magnification of example 2 are shown.
The data for example 2 is as follows:
rx (mm): the radius of curvature of each surface in the X direction;
ry (mm): the radius of curvature of each surface in the Y direction;
d (mm): lens spacing and lens thickness;
nd: refractive index of each glass of d-line;
vd: abbe number of the glass;
focal point distance: fx 15.61, Fy 11.826;
Fno：2.25；
half-picture angle: ω x is 38.0 °, ω y is 18.0 °;
| distance of object | inf | 1485 |
| D(4) | 3.428 | 4.555 |
| D(6) | 3.000 | 4.983 |
Example 3
The YZ and XZ views of the anamorphic wide screen lens provided in embodiment 3 shown in figure 6,
the optical lens comprises a first lens group G1 with negative diopter, a focusing group F with negative diopter, a cylindrical lens group YZ in the Y direction, a cylindrical lens group XZ in the X direction and a positive lens group G3 in sequence from the object side to the image side; when an object moves from infinity to close range, the negative diopter focusing group F moves to realize the focusing function, the Y-direction cylindrical lens group YZ consists of a positive lens and a negative lens, and the X-direction cylindrical lens group XZ consists of a negative lens and a positive lens.
Fig. 7 shows the infinity, Y-direction and X-direction spherical aberration, field curvature aberration, distortion aberration and chromatic aberration of magnification of example 3.
The data for example 3 is as follows:
rx (mm): the radius of curvature of each surface in the X direction;
ry (mm): the radius of curvature of each surface in the Y direction;
d (mm): lens spacing and lens thickness;
nd: refractive index of each glass of d-line;
vd: abbe number of the glass;
focal point distance: fx-32.55 and Fy-48.5;
Fno：2.45；
half-picture angle: ω x is 19.9 °, ω y is 8.9 °;
| distance of object | inf | 3000 |
| D(4) | 12.397 | 2.852 |
| D(6) | 11.147 | 4.102 |
The condition formula satisfies the condition:
the deformable wide-screen lens provided by the invention has the advantages of high performance, small volume and low cost, the deformation ratio of the deformable wide-screen lens can reach 1.3-1.55 times, and the deformable wide-screen lens has good close-up performance and elliptic light spots required by artistic creation after being zoomed.
The foregoing shows and describes the general principles, essential features, and inventive features of this invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A subminiature deformable wide-screen lens is characterized by comprising a first lens group (G1) with negative diopter, a negative diopter focusing group (F), a Y-direction cylindrical lens group (YZ), an X-direction cylindrical lens group (XZ) and a positive lens group (G3) in sequence from an object side to an image plane side;
when the object moves from infinity to close distance, the negative diopter focusing group (F) moves to realize the focusing function,
the Y-direction cylindrical lens group (YZ) consists of a positive lens and a negative lens, the X-direction cylindrical lens group (XZ) consists of a negative lens and a positive lens, and the following conditional expressions are satisfied:
1.0≤|Fy/F|≤5.0 (1)
1.5≤LZ/XI≤4.0 (2)
0.2≤LZ/L≤0.5 (3)
wherein, Fy: infinity state, the focal length in the Y direction of the entire optical system;
f: the focal distance of the negative diopter focusing group (F);
and (3) LZ: the total length from the first surface of the Y-direction cylindrical lens group (YZ) on the object side to the last surface of the X-direction cylindrical lens group (XZ) on the image surface side;
l: the length of the entire optical system;
XI: paraxial image height in the X direction, and XI ═ tan (ω X) × Fx, where ω X is the half-picture angle in the X direction; fx is an infinite state, and the focal length in the X direction of the entire optical system.
2. The subminiature anamorphic wide screen lens of claim 1, further satisfying the following conditional expression:
4.5≤LZ/YI×ANA≤9.0 (4)
wherein, LZ: the total length from the first surface of the Y-direction cylindrical lens group (YZ) on the object side to the last surface of the X-direction cylindrical lens group (XZ) on the image surface side;
YI: paraxial image height in the Y direction, and YI ═ tan (ω Y) × Fy, where ω Y is the half-line angle in the Y direction;
ANA: the deformation ratio of the Y direction and the X direction, and ANA is Fy/Fx, wherein Fy is an infinite state, and the focal length of the whole optical system in the Y direction; fx is an infinite state, and the focal length in the X direction of the entire optical system.
3. The subminiature anamorphic wide screen lens of claim 2, further satisfying the following conditional expression:
0.5≤|Fzy/L|≤1.5 (5)
wherein, Fzy: focal point distance of the Y-direction cylindrical lens group (YZ);
l: the length of the entire optical system.
4. A digital camera characterized by having the ultra-small anamorphic wide screen lens of any one of claims 1-3.
5. A digital video camera characterized by having the subminiature anamorphic wide screen lens of any one of claims 1-3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110764564.2A CN113485000A (en) | 2021-07-06 | 2021-07-06 | Ultra-small deformable wide-screen lens and digital camera and video camera with same |
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| CN202110764564.2A CN113485000A (en) | 2021-07-06 | 2021-07-06 | Ultra-small deformable wide-screen lens and digital camera and video camera with same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114740607A (en) * | 2022-06-10 | 2022-07-12 | 深圳市雷影光电科技有限公司 | Wide screen anamorphic lens |
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- 2021-07-06 CN CN202110764564.2A patent/CN113485000A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114740607A (en) * | 2022-06-10 | 2022-07-12 | 深圳市雷影光电科技有限公司 | Wide screen anamorphic lens |
| CN114740607B (en) * | 2022-06-10 | 2022-08-30 | 深圳市雷影光电科技有限公司 | Wide screen anamorphic lens |
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