CN114924384B - Lens and camera device - Google Patents
Lens and camera device Download PDFInfo
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- CN114924384B CN114924384B CN202210556937.1A CN202210556937A CN114924384B CN 114924384 B CN114924384 B CN 114924384B CN 202210556937 A CN202210556937 A CN 202210556937A CN 114924384 B CN114924384 B CN 114924384B
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Abstract
The invention discloses a lens and an image pickup device, wherein a first negative focal power lens, a first lens group, a second positive focal power lens, a second lens group, an aperture diaphragm, a third lens group, a fifth negative focal power lens, a fourth lens group and a filter are sequentially arranged from an object side to an image sideThe light sheet and the image plane are formed; the lens satisfies the following conditions:wherein f G1 F is the focal length of the first lens group G3 And f is the system focal length of the lens, and FOV is the system field angle of the lens. The full-frame optical lens has the characteristics of high resolution, large target surface, low distortion, miniaturization, low cost and the like.
Description
Technical Field
The present invention relates to the field of optical imaging technologies, and in particular, to a lens and an imaging device.
Background
In recent years, the security monitoring field is developed at a high speed, and the optical lens is increasingly applied in the security field, especially in the fields of intelligent buildings, intelligent traffic and the like, and the pixel requirement of the optical imaging lens is higher. And along with the gradual upgrading of the number of lanes on the road from 2 lanes to 3 lanes, 4 lanes and even 5 lanes, the field of view range to be monitored is larger and larger, so that the image surface of the sensor is also continuously upgraded towards a large target surface. Full-frame large-target-surface cameras gradually appear in the market at present, but fewer lenses can meet the full-frame image surface. And the large target surface introduces larger distortion, so that a lens meeting the imaging requirement of the full-picture target surface and simultaneously requiring low distortion is urgently needed in the market.
With the rapid development of the security field, a fixed focus lens has more stable optical performance compared with a zoom lens, and the demand of the fixed focus lens is highest. However, the following problems still exist in the current optical imaging lens: 1. the existing lens has small imaging target surface size and low resolution of the acquired image. 2. The lens distortion is large, and the scene requirement with low distortion requirement cannot be met. 3. The lens number is more, and the lens size is great for the design of miniaturization can't be realized to whole camera. 4. The lens has low resolution and general imaging quality. 5. The stability of performance is poor at high and low temperatures.
Therefore, a full-frame optical lens with high resolution and large target surface, low distortion, miniaturization, low cost and the like is urgently needed in the market at present.
Disclosure of Invention
The embodiment of the invention provides a lens and an imaging device, which are used for providing a full-frame optical lens with high resolution and characteristics of large target surface, low distortion, miniaturization, low cost and the like.
The embodiment of the invention provides a lens, which is formed by sequentially arranging a first negative focal power lens, a first lens group, a second positive focal power lens, a second lens group, an aperture diaphragm, a third lens group, a fifth negative focal power lens, a fourth lens group, an optical filter and an image plane from an object side to an image side;
the lens satisfies the following conditions:
wherein f G1 F is the focal length of the first lens group G3 F is a system focal length of the lens, and FOV is a field angle of the lens;
the first lens group consists of a second negative focal power lens and a first positive focal power lens which are sequentially arranged from the object side to the image side;
the second lens group consists of a third negative focal power lens and a third positive focal power lens which are sequentially arranged from the object side to the image side;
the third lens group is composed of a fourth negative focal power lens and a fourth positive focal power lens which are sequentially arranged from the object side to the image side;
the fourth lens group is composed of a fifth positive power lens and a sixth negative power lens which are arranged in order from the object side to the image side.
Further, the first negative focal power lens is a meniscus lens, and one surface of the first negative focal power lens facing the object side is a convex surface;
the second negative focal power lens is a biconcave lens;
the first positive focal power lens is a biconvex lens;
the second positive focal power lens is a biconvex lens;
the third negative focal power lens is a biconcave lens;
the third positive focal power lens is a biconvex lens;
the fourth negative focal power lens is a biconcave lens;
the fourth positive focal power lens is a biconvex lens;
the fifth negative focal power lens is a meniscus lens, and one surface of the fifth negative focal power lens facing the object side is a convex surface;
the fifth positive focal power lens is a meniscus lens, and one surface of the fifth positive focal power lens facing the object side is a concave surface;
the sixth negative focal power lens is a meniscus lens, and one surface of the sixth negative focal power lens facing the object side is a concave surface.
Further, the second negative power lens and the first positive power lens form a cemented lens group;
the third negative focal power lens and the third positive focal power lens form a cemented lens group;
the fourth negative focal power lens and the fourth positive focal power lens form a cemented lens group;
the fifth positive power lens and the sixth negative power lens constitute a cemented lens group.
Further, the central curvature radius R2 of the image side surface of the first negative power lens and the central curvature radius R3 of the object side surface of the second negative power lens satisfy:
further, the distance TTL between the system focal length f of the lens and the object plane side of the first negative focal power lens to the image plane satisfies: TTL/f is less than or equal to 2.5.
Further, f of the focal length of the first negative power lens 1 F of focal length of first positive power lens 3 F of focal length of fourth negative power lens 7 The method meets the following conditions: f (f) 1 ≤-82；f 3 ≤35；f 7 ≤-15。
Further, the Abbe number Vd of the first positive power lens 3 Abbe number Vd of the third positive power lens 6 Abbe number of the fifth negative power lensVd 9 The method meets the following conditions: vd (Vd) 3 ≤65；Vd 6 ≤55；Vd 9 ≤83。
Further, the refractive index Nd of the second negative power lens 2 Refractive index Nd of third negative focal power lens 5 Refractive index Nd of sixth negative power lens 11 The method meets the following conditions: nd 2 ≤1.72；Nd 5 ≥1.75；Nd 11 ≤1.81。
In another aspect, an embodiment of the present invention provides an image pickup apparatus including: imaging is performed using a lens as described in any one of the preceding claims.
The embodiment of the invention provides a lens and an image pickup device, wherein a first negative focal power lens, a first lens group, a second positive focal power lens, a second lens group, an aperture diaphragm, a third lens group, a fifth negative focal power lens, a fourth lens group, an optical filter and an image plane are sequentially arranged from an object side to an image side; the lens satisfies the following conditions:wherein f G1 F is the focal length of the first lens group G3 F is a system focal length of the lens, and FOV is a field angle of the lens; the first lens group consists of a second negative focal power lens and a first positive focal power lens which are sequentially arranged from the object side to the image side; the second lens group consists of a third negative focal power lens and a third positive focal power lens which are sequentially arranged from the object side to the image side; the third lens group is composed of a fourth negative focal power lens and a fourth positive focal power lens which are sequentially arranged from the object side to the image side; the fourth lens group is composed of a fifth positive power lens and a sixth negative power lens which are arranged in order from the object side to the image side.
Since in the embodiment of the invention, four lens groups are sequentially arranged from the object side to the image side in a specific order in the lens, the lens comprises 11 lenses with specific focal power, and the lens meets the following conditions: the full-frame optical lens has the characteristics of high resolution, large target surface, low distortion, miniaturization, low cost and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of a lens structure according to an embodiment of the present invention;
FIG. 2 is a graph showing the optical transfer function (MTF) of the lens according to example 1 of the present invention at normal temperature in the visible light band;
FIG. 3 is a graph showing curvature of field and distortion of a lens barrel in a visible light band according to embodiment 1 of the present invention;
FIG. 4 is a cross-sectional view of a lens barrel in the visible light range according to embodiment 1 of the present invention;
fig. 5 is a point diagram of the lens barrel in the visible light band according to embodiment 1 of the present invention;
FIG. 6 is a graph showing the optical transfer function (MTF) of the lens according to example 2 of the present invention at normal temperature in the visible light band;
FIG. 7 is a graph showing curvature of field and distortion of a lens barrel in the visible light range according to embodiment 2 of the present invention;
FIG. 8 is a cross-sectional view of a lens barrel in the visible light range according to embodiment 2 of the present invention;
fig. 9 is a point chart of the lens barrel in the visible light band according to embodiment 2 of the present invention.
Detailed Description
The present invention will be described in further detail below with reference to the attached drawings, wherein it is apparent that the embodiments described are only some, but not all embodiments of the present invention. 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.
Fig. 1 is a schematic view of a lens in accordance with embodiment 1 of the present invention, where a first negative focal power lens L1, a first lens group G1, a second positive focal power lens L4, a second lens group G2, an aperture stop P, a third lens group G3, a fifth negative focal power lens L9, a fourth lens group G4, an optical filter M, and an image plane N are sequentially arranged from an object side to an image side;
the lens satisfies the following conditions:
wherein f G1 F is the focal length of the first lens group G3 F is the system focal length of the lens, and FOV is the system field angle of the lens;
the first lens group G1 is composed of a second negative focal power lens L2 and a first positive focal power lens L3 which are sequentially arranged from the object side to the image side;
the second lens group G2 is composed of a third negative power lens L5 and a third positive power lens L6 arranged in order from the object side to the image side;
the third lens group G3 is composed of a fourth negative focal power lens L7 and a fourth positive focal power lens L8 which are sequentially arranged from the object side to the image side;
the fourth lens group G4 is composed of a fifth positive power lens L10 and a sixth negative power lens L11 arranged in order from the object side to the image side.
The aperture size of the aperture diaphragm determines the aperture value of the system and the depth of field during shooting, the aperture size can be fixed, or the aperture diaphragm with adjustable aperture can be placed according to the requirement to realize the purposes of adjustable aperture of light transmission, namely the aperture value of the variable system and the change of depth of field.
Since in the embodiment of the invention, four lens groups are sequentially arranged from the object side to the image side in a specific order in the lens, the lens comprises 11 specific lightsLens of focal power, lens satisfies: the full-frame optical lens has the characteristics of high resolution, large target surface, low distortion, miniaturization, low cost and the like.
In order to further improve the imaging quality of the lens, in the embodiment of the present invention, the first negative focal power lens is a meniscus lens, and a surface of the first negative focal power lens facing the object side is a convex surface;
the second negative focal power lens is a biconcave lens;
the first positive focal power lens is a biconvex lens;
the second positive focal power lens is a biconvex lens;
the third negative focal power lens is a biconcave lens;
the third positive focal power lens is a biconvex lens;
the fourth negative focal power lens is a biconcave lens;
the fourth positive focal power lens is a biconvex lens;
the fifth negative focal power lens is a meniscus lens, and one surface of the fifth negative focal power lens facing the object side is a convex surface;
the fifth positive focal power lens is a meniscus lens, and one surface of the fifth positive focal power lens facing the object side is a concave surface;
the sixth negative focal power lens is a meniscus lens, and one surface of the sixth negative focal power lens facing the object side is a concave surface.
The surface of the second positive power lens L4 near the object side is a convex surface, and the surface near the image side may be a plane or a convex surface.
To further enable compactness of the system, in an embodiment of the invention, the second negative power lens and the first positive power lens constitute a cemented lens group;
the third negative focal power lens and the third positive focal power lens form a cemented lens group;
the fourth negative focal power lens and the fourth positive focal power lens form a cemented lens group;
the fifth positive power lens and the sixth negative power lens constitute a cemented lens group.
In order to further improve the imaging quality of the lens and improve the processing performance of the lens, in the embodiment of the present invention, a central curvature radius R2 of the image side surface of the first negative power lens and a central curvature radius R3 of the object side surface of the second negative power lens satisfy:
to further enable compactness of the system, in an embodiment of the present invention, a distance TTL between the system focal length f of the lens and the object plane side of the first negative power lens to the image plane is: TTL/f is less than or equal to 2.5.
In order to further improve the imaging quality of the lens, in the embodiment of the present invention, the focal length f of the first negative power lens 1 F of focal length of first positive power lens 3 F of focal length of fourth negative power lens 7 The method meets the following conditions: f (f) 1 ≤-82；f 3 ≤35；f 7 ≤-15。
In an embodiment of the present invention, in order to enable clear imaging of the lens over a larger temperature range, in an embodiment of the present invention, the Abbe number Vd of the first positive power lens 3 Abbe number Vd of the third positive power lens 6 Abbe number Vd of fifth negative power lens 9 The method meets the following conditions: vd (Vd) 3 ≤65；Vd 6 ≤55；Vd 9 Less than or equal to 83. In addition, the following are satisfied: vd (Vd) 3 ≤65；Vd 6 ≤55；Vd 9 Less than or equal to 83 can also reduce the chromatic aberration of the image, thereby improving the imaging quality.
In order to improve the imaging quality of the lens and reduce the total length of the lens, in the embodiment of the invention, the refractive index Nd of the second negative power lens 2 Refractive index Nd of third negative focal power lens 5 Refractive index Nd of sixth negative power lens 11 The method meets the following conditions: nd 2 ≤1.72；Nd 5 ≥1.75；Nd 11 Less than or equal to 1.81. And, satisfy: nd 2 ≤1.72；Nd 5 ≥1.75；Nd 11 The spherical aberration can be reduced by less than or equal to 1.81, and the imaging quality can be improved.
In addition, an embodiment of the present invention provides an image pickup apparatus including: the lens provided by the embodiment of the invention is used for imaging.
The optical performance realized by the lens provided by the embodiment of the invention is as follows:
the imaging can be used by a sensor with the maximum supporting target surface full-picture size, and the total mechanical length of the lens is not more than 120mm;
the MTF value of the full view field reaches more than 0.5 under the condition of 80 lp/mm;
the number of lenses of the lens is small, the processability is good, and the cost control is low;
the aperture is larger, the F number is 4.0, and the device can meet the monitoring requirement under certain low-illumination conditions;
the optical performance is stable, and the requirements of high and low temperature working conditions of minus 30 ℃ to +70 ℃ are met.
The following illustrates lens parameters provided in the embodiments of the present invention.
Example 1:
in a specific implementation process, the curvature radius R, the center thickness Tc, the refractive index Nd, the abbe constant Vd and the conic coefficient k of each lens of the lens satisfy the conditions listed in table 1:
TABLE 1
In the schematic view of the lens structure shown in fig. 1, the mirror numbers in table 1 are the numbers of the lenses from left to right.
Wherein the variable thickness data is as in parameter table 2:
| object distance/mm | D10 |
| 700 | 2.94 |
| 1000 | 2.08 |
| Infinity | 0.20 |
TABLE 2
The lens provided by the embodiment has the following optical technical indexes:
the total optical length TTL is less than or equal to 120.0mm;
lens focal length f:50mm;
angle of field of the lens: 47.1 °;
optical distortion of the lens: -1.0%;
aperture f.no. of lens system: 4.0;
lens image surface size: phi 46mm.
In the embodiment of the invention, the lens L2 and the lens L3 are the cemented lens group G1, and the focal length of the cemented lens group G1 is f G1 The method comprises the steps of carrying out a first treatment on the surface of the The lens L7 and the lens L8 are a bonding lens group G3, and the focal length of the bonding lens group G3 is f G3 The method comprises the steps of carrying out a first treatment on the surface of the The system focal length of the lens is f, and the field angle is FOV; the following relation is satisfied:15.21; the central curvature radius R2 of the image side of the lens L1 of the optical lens and the central curvature radius R3 of the object side of the lens L2 satisfy: />The system focal length of the optical lens is f and the optics of the optical lensThe total length TTL satisfies the following conditions: />F1= -125.39 for the focal length of lens L1, f3=31.19 for the focal length of lens L3, f7= -17.70 for the focal length of lens L7; the abbe number vd3= 60.37 of the glass material of the lens L3 of the optical lens, the abbe number vd6=47.92 of the glass material of the lens L6, and the abbe number vd9=81.60 of the glass material of the lens L9; the refractive index nd3=1.62 of the glass material of the lens L3 of the optical lens, the refractive index nd5=2.00 of the glass material of the lens L5, and the refractive index nd6=1.71 of the glass material of the lens L6.
Example 2:
in a specific implementation process, the curvature radius R, the center thickness Tc, the refractive index Nd, the abbe constant Vd, and the conic coefficient k of each lens of the lens satisfy the conditions listed in table 3:
TABLE 3 Table 3
In the schematic view of the lens structure shown in fig. 1, the mirror numbers in table 3 are the numbers of the lenses from left to right.
Wherein, the variable thickness data is as in parameter table 4:
| object distance/mm | D10 |
| 700 | 4.28 |
| 1000 | 2.99 |
| Infinity | 0.20 |
TABLE 4 Table 4
The lens provided by the embodiment has the following optical technical indexes:
the total optical length TTL is less than or equal to 120.0mm;
lens focal length f:51mm;
angle of field of the lens: 46.78 °;
optical distortion of the lens: -0.5%;
aperture f.no. of lens system: 4.0;
lens image surface size: phi 46mm.
In the embodiment of the invention, the lens L2 and the lens L3 are the cemented lens group G1, and the focal length of the cemented lens group G1 is f G1 The method comprises the steps of carrying out a first treatment on the surface of the The lens L7 and the lens L8 are a bonding lens group G3, and the focal length of the bonding lens group G3 is f G3 The method comprises the steps of carrying out a first treatment on the surface of the The system focal length of the lens is f, and the field angle is FOV; the following relation is satisfied:5.12; the central curvature radius R2 of the image side of the lens L1 of the optical lens and the central curvature radius R3 of the object side of the lens L2 satisfy: />The system focal length f of the optical lens and the total optical length TTL of the optical lens satisfy the following conditions: />F1= -96.36 for the focal length of lens L1, f3=24.42 for the focal length of lens L3, f7= -33.08 for the focal length of lens L7; the abbe number vd3=41.14 of the glass material of the lens L3 of the optical lens, the abbe number vd6= 52.19 of the glass material of the lens L6, and the abbe number vd9= 68.62 of the glass material of the lens L9; refractive index nd3=1.70 of glass material of lens L3 of the optical lens, and refractive index of glass material of lens L5The refractive index nd6=1.51 of the glass material of the lens L6 with a ratio nd5=1.84.
In summary, examples 1 to 2 each satisfy the relationships shown in table 5 below.
TABLE 5
The lens provided by this embodiment will be further described by a detailed analysis of the optical system of the embodiment.
The optical transfer function is used for evaluating an imaging quality of the imaging system in a more accurate, visual and common mode, and the higher and smoother the curve is, which shows that the better the imaging quality of the system is, the better correction is carried out on various aberrations (such as spherical aberration, coma aberration, astigmatism, field curvature, axial chromatic aberration, vertical axis chromatic aberration and the like).
As shown in fig. 2, an optical transfer function (MTF) curve of the lens shown in example 1 at normal temperature in the visible light band is shown;
as shown in fig. 3, a field curvature and distortion diagram of the lens barrel in the visible light band shown in embodiment 1 are shown;
as shown in fig. 4, a transverse fan diagram of the lens in the visible light band shown in embodiment 1 is shown;
as shown in fig. 5, a point diagram of the lens barrel in the visible light range shown in embodiment 1 is shown.
As shown in fig. 6, an optical transfer function (MTF) curve of the lens shown in example 2 at normal temperature in the visible light band is shown;
as shown in fig. 7, a field curvature and distortion diagram of the lens barrel in the visible light band shown in embodiment 2 is shown;
as shown in fig. 8, a transverse fan diagram of the lens in the visible light band shown in embodiment 2 is shown;
as shown in fig. 9, a point diagram of the lens barrel in the visible light range shown in embodiment 2 is shown.
As can be seen from fig. 2, the optical transfer function (MTF) curve of the lens at normal temperature in the visible light portion is smoother and more concentrated, and the MTF average value in the full field of view (half image height Y' =23.0 mm) reaches more than 0.5; the lens provided by the embodiment of the invention can meet higher imaging requirements.
As can be seen from fig. 6, the optical transfer function (MTF) curve of the lens at normal temperature in the visible light portion is smoother and more concentrated, and the MTF average value in the full field of view (half image height Y' =23.0 mm) reaches more than 0.5; the lens provided by the embodiment of the invention can meet higher imaging requirements.
As can be seen from fig. 3 and 7, the curvature of field of the lens is controlled within ±0.2 mm. The field Qu Youchen "field curvature". When the lens is curved, the intersection point of the whole light beam does not coincide with the ideal image point, and although a clear image point can be obtained at each specific point, the whole image plane is a curved surface. T represents the meridian curvature and S represents the sagittal curvature. The field curvature curve shows the distance of the current focal plane or image plane to the paraxial focal plane as a function of the field coordinates, and the meridian field curvature data is the distance measured along the Z-axis from the currently determined focal plane to the paraxial focal plane and is measured on the meridian (YZ-plane). The sagittal field curvature data measures the distance measured in a plane perpendicular to the meridian plane, the base line in the diagram being on the optical axis, the top of the curve representing the maximum field of view (angle or height), and no units being placed on the longitudinal axis, since the curve is always normalized by the maximum radial field of view.
As can be seen from fig. 3 and 7, the lens distortion control is better, within-1.0%. Fig. 4 is coincident in fig. 4 with reference to the curves for multiple wavelengths (0.436 um, 0.486um, 0.546um, 0.587um, and 0.656 um). Generally, lens distortion is actually a generic term for perspective distortion inherent to an optical lens, that is, distortion due to perspective, which is very detrimental to the imaging quality of a photograph, and after all, the purpose of photographing is to reproduce, not exaggerate, but cannot be eliminated and only improved because it is inherent characteristics of the lens (convex lens converging light, concave lens diverging light). As can be seen from fig. 3 and 7, the distortion of the lens provided in embodiment 1 of the present invention is-1.0%; the distortion of the lens provided in example 2 of the present invention was-0.5%; the distortion is set to balance the focal length, the angle of view and the size of the corresponding camera target surface, and the deformation caused by the distortion can be corrected through post image processing.
As can be seen from fig. 4 and 8, the curves in the fan diagrams are concentrated, and the spherical aberration and dispersion of the lens are well controlled. As can be seen from fig. 5 and 9, the lens spot radius is smaller, and the lens spot radius is more concentrated, and the corresponding aberration and coma are also good.
In summary, the embodiment of the invention provides an optical zoom lens with full-image large target surface, low distortion and low cost and high imaging definition. The imaging system adopts 11 optical lenses with specific structural shapes, and the optical lenses are sequentially arranged from an object side to an image side according to a specific sequence, and can realize better distortion control and excellent imaging characteristics through the distribution and combination of specific optical power of each optical lens.
The embodiment of the invention provides a lens and an image pickup device, wherein a first negative focal power lens, a first lens group, a second positive focal power lens, a second lens group, an aperture diaphragm, a third lens group, a fifth negative focal power lens, a fourth lens group, an optical filter and an image plane are sequentially arranged from an object side to an image side; the lens satisfies the following conditions:wherein f G1 F is the focal length of the first lens group G3 F is a system focal length of the lens, and FOV is a field angle of the lens; the first lens group consists of a second negative focal power lens and a first positive focal power lens which are sequentially arranged from the object side to the image side; the second lens group consists of a third negative focal power lens and a third positive focal power lens which are sequentially arranged from the object side to the image side; the third lens group is composed of a fourth negative focal power lens and a fourth positive focal power lens which are sequentially arranged from the object side to the image side; the fourth lens group is composed of a fifth positive power lens and a sixth negative power lens which are arranged in order from the object side to the image side.
In the embodiment of the invention, the lens is arranged from the object side to the image side in a specific orderFour lens groups, the lens includes 11 lenses of specific focal power, the lens satisfies: the full-frame optical lens has the characteristics of high resolution, large target surface, low distortion, miniaturization, low cost and the like.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. The lens is characterized in that a first negative focal power lens, a first lens group, a second positive focal power lens, a second lens group, an aperture diaphragm, a third lens group, a fifth negative focal power lens, a fourth lens group, an optical filter and an image plane are sequentially arranged from an object side to an image side;
the lens satisfies the following conditions:
wherein f G1 F is the focal length of the first lens group G3 F is a system focal length of the lens, and FOV is a field angle of the lens;
the first lens group consists of a second negative focal power lens and a first positive focal power lens which are sequentially arranged from the object side to the image side;
the second lens group consists of a third negative focal power lens and a third positive focal power lens which are sequentially arranged from the object side to the image side;
the third lens group is composed of a fourth negative focal power lens and a fourth positive focal power lens which are sequentially arranged from the object side to the image side;
the fourth lens group is composed of a fifth positive focal power lens and a sixth negative focal power lens which are sequentially arranged from the object side to the image side;
the system focal length f of the lens and the distance TTL from the object plane side of the first negative focal power lens to the image plane satisfy the following conditions: TTL/f is less than or equal to 2.5.
2. The lens of claim 1, wherein the first negative power lens is a meniscus lens, and a surface facing the object side is a convex surface;
the second negative focal power lens is a biconcave lens;
the first positive focal power lens is a biconvex lens;
the second positive focal power lens is a biconvex lens;
the third negative focal power lens is a biconcave lens;
the third positive focal power lens is a biconvex lens;
the fourth negative focal power lens is a biconcave lens;
the fourth positive focal power lens is a biconvex lens;
the fifth negative focal power lens is a meniscus lens, and one surface of the fifth negative focal power lens facing the object side is a convex surface;
the fifth positive focal power lens is a meniscus lens, and one surface of the fifth positive focal power lens facing the object side is a concave surface;
the sixth negative focal power lens is a meniscus lens, and one surface of the sixth negative focal power lens facing the object side is a concave surface.
3. The lens of claim 1 wherein the second negative power lens and the first positive power lens form a cemented lens group;
the third negative focal power lens and the third positive focal power lens form a cemented lens group;
the fourth negative focal power lens and the fourth positive focal power lens form a cemented lens group;
the fifth positive power lens and the sixth negative power lens constitute a cemented lens group.
4. The lens of claim 1, wherein the first lensThe center curvature radius R2 of the image side surface of the negative power lens and the center curvature radius R3 of the object side surface of the second negative power lens satisfy the following conditions:
5. the lens of claim 1 wherein f of the focal length of the first negative power lens 1 F of focal length of first positive power lens 3 F of focal length of fourth negative power lens 7 The method meets the following conditions: f (f) 1 ≤-82；f 3 ≤35；f 7 ≤-15。
6. The lens of claim 1 wherein the first positive power lens has an Abbe number Vd 3 Abbe number Vd of the third positive power lens 6 Abbe number Vd of fifth negative power lens 9 The method meets the following conditions: vd (Vd) 3 ≤65；Vd 6 ≤55；Vd 9 ≤83。
7. The lens of claim 1 wherein the refractive index Nd of the second negative power lens 2 Refractive index Nd of third negative focal power lens 5 Refractive index Nd of sixth negative power lens 11 The method meets the following conditions: nd 2 ≤1.72；Nd 5 ≥1.75；Nd 11 ≤1.81。
8. An image pickup apparatus, comprising: imaging with a lens according to any of the preceding claims 1 to 7.
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| CN104238086A (en) * | 2013-06-17 | 2014-12-24 | 富士胶片株式会社 | Imaging lens and imaging apparatus |
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