CN115016104A - Lens and camera device - Google Patents
Lens and camera device Download PDFInfo
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- CN115016104A CN115016104A CN202210949805.5A CN202210949805A CN115016104A CN 115016104 A CN115016104 A CN 115016104A CN 202210949805 A CN202210949805 A CN 202210949805A CN 115016104 A CN115016104 A CN 115016104A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
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- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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Abstract
The invention discloses a lens and a camera device, wherein a first negative focal power lens, a first positive focal power lens, a second positive focal power lens, a lens group, an aperture diaphragm, a fourth positive focal power lens, a third negative focal power lens and an image plane are sequentially arranged from an object side to an image side; the lens satisfies the following conditions:
wherein f is G1 F is the focal length of the lens group, f is the focal length of the lens, and FOV is the field angle of the lens. The full-frame optical lens has the characteristics of high resolving power, large target surface, low distortion, miniaturization, low cost and the like.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a lens and a camera device.
Background
In recent years, the field of security and monitoring is developed at a high speed, and optical lenses are increasingly applied in the field of security and protection, and especially in the fields of intelligent buildings, intelligent transportation and the like, the pixel requirement of optical imaging lenses is increasingly high. And as the number of lanes on the road is gradually upgraded from 2 lanes to 3 lanes, 4 lanes and even 5 lanes, the field of view range needing to be monitored is larger and larger, so that the image plane of the sensor is also continuously upgraded towards a large target plane. At present, full-frame large target cameras gradually appear in the market, but the number of lenses capable of meeting the requirement of a full-frame image plane is small. And large distortion is introduced into a large target surface, so that a lens meeting the imaging requirement of a full-picture target surface and requiring low distortion is urgently needed in the market.
With the rapid development of the security field, the fixed focus lens has more stable optical performance compared with a zoom lens, and the demand of the fixed focus lens is the highest. However, the following problems still exist in the existing optical imaging lens: 1. the existing lens has small size of an imaging target surface and low resolution of an acquired image. 2. The distortion of the lens is large, and the scene requirement with low distortion requirement cannot be met. 3. The number of lenses is used more, and the lens size is great for whole camera can't realize miniaturized design. 4. The lens resolution is not high, and the imaging quality is general. 5. The stability of the properties at high and low temperatures is not good.
Therefore, there is a need for a full-frame optical lens with high resolution and high target area, low distortion, small size and low cost.
Disclosure of Invention
The embodiment of the invention provides a lens and a camera device, which are used for providing a full-frame optical lens with high resolution and the characteristics of large target surface, low distortion, miniaturization, low cost and the like.
The embodiment of the present invention provides a lens, in which a first negative power lens, a first positive power lens, a second positive power lens, a lens group, an aperture stop, a fourth positive power lens, a third negative power lens, and an image plane are sequentially arranged from an object side to an image side;
the lens satisfies the following conditions:
wherein f is G1 F is the focal length of the lens group, f is the focal length of the lens, and FOV is the field angle of the lens;
the lens group is composed of a third positive focal power lens and a second negative focal power lens which are arranged in sequence from the object side to the image side.
Further, the first negative power lens is a meniscus lens, and one surface of the meniscus lens facing the object side is a convex surface;
the first positive focal power lens is a meniscus lens, and one surface of the first positive focal power lens facing the object side is a convex surface;
the second positive focal power lens is a meniscus lens, and one surface of the second positive focal power lens facing the object side is a concave surface;
the third positive focal power lens is a biconvex lens;
the second negative focal power lens is a biconcave lens;
the fourth positive focal power lens is a meniscus lens, and one surface of the fourth positive focal power lens facing the object side is a concave surface;
the third negative power lens is a meniscus lens, and one surface of the third negative power lens facing the object side is a concave surface.
Further, the third positive power lens and the second negative power lens constitute a cemented lens group.
Further, the central curvature radius R9 of the image side surface of the second negative power lens and the central curvature radius R11 of the object side surface of the fourth positive power lens satisfy:
further, a distance TTL from the object plane side of the first negative power lens to the image plane and a focal length f of the first positive power lens 2 Satisfies the following conditions:
further, f2 of the focal length of the first positive power lens, f3 of the focal length of the second positive power lens, and f4 of the focal length of the third positive power lens satisfy: f2 is less than or equal to 152; f3 is less than or equal to 75; f4 is less than or equal to 25.
Further, the abbe number Vd1 of the glass material of the first negative power lens, the abbe number Vd3 of the glass material of the second positive power lens, and the abbe number Vd4 of the glass material of the third positive power lens satisfy: vd1 is less than or equal to 64; vd3 is less than or equal to 68; vd4 is less than or equal to 83.
Further, the refractive index Nd3 of the glass material of the second positive power lens, the refractive index Nd4 of the glass material of the third positive power lens, and the refractive index Nd6 of the glass material of the fourth positive power lens satisfy: nd3 is less than or equal to 1.65; nd4 is more than or equal to 1.48; nd6 is less than or equal to 1.86.
Further, an optical filter is arranged between the third negative power lens and the image plane.
In another aspect, an embodiment of the present invention provides an imaging apparatus including: imaging is performed by using the lens barrel of any one of the above.
The embodiment of the invention provides a lens and a camera device, wherein the lens is provided with a first negative focal power lens, a first positive focal power lens, a second positive focal power lens, a lens group, an aperture diaphragm, a fourth positive focal power lens, a third negative focal power lens and an image plane in sequence from an object side to an image side; the lens satisfies the following conditions:
wherein f is G1 F is the focal length of the lens group, and FOV is the field angle of the lens. Since in the embodiment of the present invention, the 7 lenses having the specific powers are arranged in the lens in order from the object side to the image side in a specific order, and the lens satisfies:
the full-frame optical lens has the characteristics of high resolving power, large target surface, low distortion, miniaturization, low cost and the like.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of a lens structure according to an embodiment of the present invention;
fig. 2 is a graph of an optical transfer function (MTF) of the lens provided in embodiment 1 of the present invention in a normal temperature state of a visible light band;
fig. 3 is a field curvature and distortion diagram of a lens provided in embodiment 1 of the present invention in a visible light band;
fig. 4 is a transverse light fan diagram of a lens provided in embodiment 1 of the present invention in a visible light band;
fig. 5 is a dot-column diagram of a lens provided in embodiment 1 of the present invention in a visible light band;
fig. 6 is a graph of an optical transfer function (MTF) of the lens provided in embodiment 1 of the present invention in a normal temperature state of a visible light band;
fig. 7 is a field curvature and distortion diagram of a lens provided in embodiment 2 of the present invention in a visible light band;
fig. 8 is a transverse fan diagram of a lens provided in embodiment 2 of the present invention in a visible light band;
fig. 9 is a dot-column diagram of a lens provided in embodiment 2 of the present invention in a visible light band.
Detailed Description
The present invention will be described in further detail with reference to the attached drawings, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic view of a lens barrel according to embodiment 1 of the present invention, in which a first negative power lens L1, a first positive power lens L2, a second positive power lens L3, a lens group G1, an aperture stop P, a fourth positive power lens L6, a third negative power lens L7, and an image plane N are arranged in order from an object side to an image side;
the lens satisfies the following conditions:
wherein f is G1 Is the focal length of the lens group, f is the focal length of the lensDistance, FOV, is the field angle of the lens;
the lens group G1 is composed of a third positive power lens L4 and a second negative power lens L5 arranged in this order from the object side to the image side.
And an optical filter M is arranged between the third negative-power lens L7 and the image surface N.
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 adjustment of the clear aperture, namely the purpose of changing the aperture value of the system and the depth of field is achieved.
Filters are optical devices used to select a desired wavelength band of radiation. By arranging the optical filter, the optical filter in the imaging system provided by the embodiment of the invention is simulated, so that the optical path difference of the optical filter in the imaging system is considered in the lens design, and the obtained lens meets the following requirements:
the performance of the lens is better.
Since in the embodiment of the present invention, the 7 lenses having the specific powers are arranged in the lens in order from the object side to the image side in a specific order, and the lens satisfies:
the full-frame optical lens has the characteristics of high resolving power, large target surface, low distortion, miniaturization, low cost and the like.
In order to further improve the imaging quality of the lens barrel, in the embodiment of the present invention, the first negative power lens is a meniscus lens, and one surface of the first negative power lens facing the object side is a convex surface;
the first positive focal power lens is a meniscus lens, and one surface of the first positive focal power lens facing the object side is a convex surface;
the second positive focal power lens is a meniscus lens, and one surface of the second positive focal power lens facing the object side is a concave surface;
the third positive focal power lens is a biconvex lens;
the second negative focal power lens is a biconcave lens;
the fourth positive focal power lens is a meniscus lens, and one surface of the fourth positive focal power lens facing the object side is a concave surface;
the third negative power lens is a meniscus lens, and one surface of the third negative power lens facing the object side is a concave surface.
In order to further enable the system to be compact, in the embodiment of the present invention, the third positive power lens and the second 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 invention, the central curvature radius R9 of the image side surface of the second negative power lens and the central curvature radius R11 of the object side surface of the fourth positive power lens satisfy the following conditions:
in order to further enable the system to be compact, in the embodiment of the present invention, the distance TTL from the object plane side of the first negative power lens to the image plane and the focal length f of the first positive power lens 2 Satisfies the following conditions:
in order to further improve the imaging quality of the lens, in the embodiment of the present invention, f2 of the focal length of the first positive power lens, f3 of the focal length of the second positive power lens, and f4 of the focal length of the third positive power lens satisfy: f2 is less than or equal to 152; f3 is less than or equal to 75; f4 is less than or equal to 25.
In the embodiment of the present invention, in order to enable a lens to form an image clearly in a wide temperature range, in the embodiment of the present invention, the abbe number Vd1 of the glass material of the first negative power lens, the abbe number Vd3 of the glass material of the second positive power lens, and the abbe number Vd4 of the glass material of the third positive power lens satisfy: vd1 is less than or equal to 64; vd3 is less than or equal to 68; vd4 is less than or equal to 83. In addition, the following are satisfied: vd1 is less than or equal to 64; vd3 is less than or equal to 68; vd4 ≦ 83 also reduces the color difference 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 Nd3 of the glass material of the second positive power lens, the refractive index Nd4 of the glass material of the third positive power lens and the refractive index Nd6 of the glass material of the fourth positive power lens satisfy: nd3 is less than or equal to 1.65; nd4 is more than or equal to 1.48; nd6 is less than or equal to 1.86. And, satisfies: nd3 is less than or equal to 1.65; nd4 is more than or equal to 1.48; the Nd6 is less than or equal to 1.86, so that the spherical aberration can be reduced, and the imaging quality is improved.
In another aspect, an embodiment of the present invention provides an imaging apparatus including: the lens is adopted for imaging.
The optical performance of the lens provided by the embodiment of the invention is as follows:
the lens imaging target surface can support the full picture size to the maximum, and the imaging quality is ensured while the miniaturization of the lens structure is effectively realized. The imaging can support the use of a sensor with the full picture size of a target surface to the maximum, and the mechanical total length of a lens does not exceed 100 mm; the MTF value of the whole field of view reaches more than 0.4 under the condition of 80 lp/mm; the lens has the advantages of less lens number, good processability and low cost control; the distortion is small and is within 2 percent, and the requirement of high-precision imaging is met; the optical performance is stable, and the requirements under the high and low temperature working conditions of minus 30 to plus 70 ℃ are met.
The following exemplifies the lens parameters provided by the embodiment 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 meet the conditions listed in Table 1:
TABLE 1
The lens provided by the embodiment has the following optical technical indexes:
the total optical length TTL is less than or equal to 95 mm;
focal length f of the lens: 30.5 mm;
angle of view of lens: 66.4 degrees;
optical distortion of the lens: -1.0%;
aperture f.no: 4.0;
size of a lens image plane: phi 45 mm.
In the embodiment of the present invention, lens L4 and lens L5 constitute lens group G1, and the focal length of lens group G1 is f G1 (ii) a The focal length of the lens is f, and the field angle is FOV; the following relation is satisfied:
the central curvature radius R9 of the image side surface of the lens L5 of the optical lens and the central curvature radius R11 of the object side surface of the lens L6 satisfy that:
the focal length of the lens L2 in the optical lens is f2 and the total optical length TTL of the optical lens satisfies the following conditions:
(ii) a F2=121.46 for the focal length of lens L2, f3=68.20 for the focal length of lens L3, f4=24.09 for the focal length of lens L4; an abbe number Vd1=60.37 of a glass material of a lens L1, an abbe number Vd3=63.40 of a glass material of a lens L3, and an abbe number Vd4=81.59 of a glass material of a lens L4; the refractive index Nd3=1.61 of the glass material of the lens L3, the refractive index Nd4=1.49 of the glass material of the lens L4, and the refractive index Nd6=1.84 of the glass material of the lens L6 of the optical lens.
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 barrel satisfy the conditions listed in table 2:
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 92 mm;
focal length f of the lens: 30.0 mm;
angle of view of lens: 69.0 degrees;
optical distortion of the lens: -1.0%;
aperture f.no: 4.0;
size of a lens image plane: phi 45 mm.
In the embodiment of the present invention, lens L4 and lens L5 constitute lens group G1, and the focal length of lens group G1 is f G1 (ii) a The focal length of the lens is f, and the field angle is FOV; the following relation is satisfied:
the central curvature radius R9 of the image side surface of the lens L5 of the optical lens and the central curvature radius R11 of the object side surface of the lens L6 satisfy that:
the focal length of lens L2 in the optical lens is
And the total optical length TTL of the optical lens meets the following requirements:
(ii) a F2=113.23 of the focal length of lens L2, f3=73.67 of the focal length of lens L3, f4=21.45 of the focal length of lens L4 of the optical lens; an abbe number Vd1=56.72 of a glass material of a lens L1 of the optical lens, an abbe number Vd3=65.45 of a glass material of a lens L3, and an abbe number Vd4=68.62 of a glass material of a lens L4; the refractive index Nd3=1.60 of the glass material of the lens L3, the refractive index Nd4=1.59 of the glass material of the lens L4, and the refractive index Nd6=1.74 of the glass material of the lens L6 of the optical lens.
In summary, examples 1 to 2 each satisfy the relationship shown in table 3 below.
TABLE 3
The lens provided by the embodiment is further described below by performing a detailed optical system analysis on the embodiment.
The optical transfer function is used for evaluating the imaging quality of an optical system in a more accurate, visual and common mode, and the higher and smoother the curve of the optical transfer function, the better the imaging quality of the system is, and the aberration is well corrected.
As shown in fig. 2, a graph of an optical transfer function (MTF) of the lens provided in embodiment 1 of the present invention in a normal temperature state of a visible light band;
as shown in fig. 3, a field curvature and a distortion diagram of the lens provided in embodiment 1 of the present invention in the visible light band;
as shown in fig. 4, a transverse light fan diagram of the lens provided in embodiment 1 of the present invention in the visible light band;
as shown in fig. 5, a dot-column diagram of the lens provided in embodiment 1 of the present invention in the visible light band is shown.
As shown in fig. 6, a graph of an optical transfer function (MTF) of the lens provided in embodiment 1 of the present invention in a normal temperature state in a visible light band;
as shown in fig. 7, a field curvature and a distortion diagram of the lens provided in embodiment 2 of the present invention in the visible light band;
as shown in fig. 8, a transverse light fan diagram of the lens provided in embodiment 2 of the present invention in the visible light band;
as shown in fig. 9, a dot-column diagram of the lens provided in embodiment 2 of the present invention in the visible light band is shown.
As can be seen from fig. 2, the optical transfer function (MTF) curve of the lens in the normal temperature state in the visible light portion is smooth and concentrated, and the average MTF value of the full field of view (half-image height Y' =22.5 mm) is above 0.5; therefore, 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 in the normal temperature state in the visible light portion is smooth and concentrated, and the average MTF value of the full field of view (half-image height Y' =22.5 mm) is above 0.5; therefore, 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 ± 0.5 mm. The curvature of field is also called as "curvature of field". When the lens has field curvature, the intersection point of the whole light beam is not overlapped with an 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 meridional field curvature, and S represents the sagittal field 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 field coordinates, and the meridional field curvature data is the distance from the currently determined focal plane to the paraxial focal plane measured along the Z axis and measured in the meridional (YZ plane). Sagittal curvature of field data measures distances measured in a plane perpendicular to the meridian plane, the base line in the schematic is on the optical axis, the top of the curve represents the maximum field of view (angle or height), and no units are set on the vertical 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 good, within-1.0%. Fig. 4 shows the coincidence in fig. 4 with reference to the curves of a plurality of wavelengths (0.436 um, 0.486 um, 0.546 um, 0.587 um, and 0.656 um). Generally, lens distortion is a general term of intrinsic perspective distortion of an optical lens, that is, distortion caused by perspective, which is very unfavorable for the imaging quality of a photograph, and after all, the purpose of photography is to reproduce rather than exaggerate, but because the distortion is intrinsic characteristics of the lens (converging light rays of a convex lens and diverging light rays of a concave lens), the distortion cannot be eliminated, and only can be improved. As can be seen from fig. 3 and 7, the distortion of the lens provided by embodiment 1 of the present invention is-0.9%; the distortion of the lens provided by the embodiment 2 of the invention is-1.0%; the distortion is set to balance the focal length, the field angle and the size of the target surface of the corresponding camera, 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 sector diagrams are more concentrated, and the spherical aberration and dispersion of the lens are better controlled. As can be seen from fig. 5 and 9, the lens spot radius is small and relatively concentrated, and the corresponding aberration and coma are also good.
In fig. 4 and 8, EX represents the X-direction aberration, EY represents the Y-direction aberration, PX represents the normalized X-direction pupil coordinate, and PY represents the normalized Y-direction pupil coordinate.
In summary, the embodiments of the present invention provide a full-frame large-target-surface, low-distortion, low-cost, high-definition imaging optical lens. The imaging system adopts 7 optical lenses with specific structural shapes, and the optical lenses are arranged in sequence from the object side to the image side according to a specific sequence, and the specific optical power distribution and combination of the optical lenses enable the imaging system to realize better distortion control and excellent imaging characteristics.
The embodiment of the invention provides a lens and a camera device, wherein the lens is provided with a first negative focal power lens, a first positive focal power lens, a second positive focal power lens, a lens group, an aperture diaphragm, a fourth positive focal power lens, a third negative focal power lens and an image plane in sequence from an object side to an image side; the lens satisfies the following conditions:
wherein f is G1 F is the focal length of the lens group, f is the focal length of the lens, and FOV is the field angle of the lens. Since in the embodiment of the present invention, the 7 lenses having the specific powers are arranged in the lens in order from the object side to the image side in a specific order, and the lens satisfies:
the full-frame optical lens has the characteristics of high resolving power, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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. Therefore, it is intended that the appended claims be interpreted as including 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 changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A lens is characterized in that a first negative focal power lens, a first positive focal power lens, a second positive focal power lens, a lens group, an aperture diaphragm, a fourth positive focal power lens, a third negative focal power lens and an image plane are sequentially arranged from an object side to an image side;
the lens satisfies the following conditions:
wherein f is G1 F is the focal length of the lens group, f is the focal length of the lens, and FOV is the field angle of the lens;
the lens group is composed of a third positive focal power lens and a second negative focal power lens which are arranged in sequence from the object side to the image side.
2. The lens barrel according to claim 1, wherein the first negative power lens is a meniscus lens, and a surface thereof facing the object side is a convex surface;
the first positive focal power lens is a meniscus lens, and one surface of the first positive focal power lens facing the object side is a convex surface;
the second positive focal power lens is a meniscus lens, and one surface of the second positive focal power lens, which faces the object side, is a concave surface;
the third positive focal power lens is a biconvex lens;
the second negative focal power lens is a biconcave lens;
the fourth positive focal power lens is a meniscus lens, and one surface of the fourth positive focal power lens facing the object side is a concave surface;
the third negative-power lens is a meniscus lens, and one surface of the third negative-power lens, which faces the object side, is a concave surface.
3. The lens barrel according to claim 1, wherein the third positive power lens and the second negative power lens constitute a cemented lens group.
4. The lens barrel as claimed in claim 1, wherein a center radius of curvature R9 of the image side surface of the second negative power lens and a center radius of curvature R11 of the object side surface of the fourth positive power lens satisfy:
。
5. the method of claim 1A lens barrel characterized in that a distance TTL from an object plane side of the first negative power lens to the image plane and a focal length f of the first positive power lens 2 Satisfies the following conditions:
。
6. the lens barrel according to claim 1, wherein f2 of the focal length of the first positive power lens, f3 of the focal length of the second positive power lens, and f4 of the focal length of the third positive power lens satisfy: f2 is less than or equal to 152; f3 is less than or equal to 75; f4 is less than or equal to 25.
7. The lens barrel according to claim 1, wherein an abbe number Vd1 of a glass material of the first negative power lens, an abbe number Vd3 of a glass material of the second positive power lens, and an abbe number Vd4 of a glass material of the third positive power lens satisfy: vd1 is less than or equal to 64; vd3 is less than or equal to 68; vd4 is less than or equal to 83.
8. The lens barrel according to claim 1, wherein a refractive index Nd3 of a glass material of the second positive power lens, a refractive index Nd4 of a glass material of the third positive power lens, and a refractive index Nd6 of a glass material of the fourth positive power lens satisfy: nd3 is less than or equal to 1.65; nd4 is more than or equal to 1.48; nd6 is less than or equal to 1.86.
9. The lens barrel according to claim 1, wherein an optical filter is provided between the third negative power lens and the image plane.
10. An image pickup apparatus, comprising: imaging is performed using the lens barrel of any one of the above claims 1 to 9.
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| JP2005352060A (en) * | 2004-06-09 | 2005-12-22 | Fujinon Corp | Small-size wide-angle lens with large aperture and camera equipped with same |
| CN113204103A (en) * | 2021-05-18 | 2021-08-03 | 广东旭业光电科技股份有限公司 | Optical imaging lens and camera device |
| CN113589478A (en) * | 2021-07-12 | 2021-11-02 | 浙江大华技术股份有限公司 | Lens |
| US20220026671A1 (en) * | 2020-07-27 | 2022-01-27 | Changzhou Raytech Optronics Co., Ltd. | Camera optical lens |
| CN216013795U (en) * | 2021-09-30 | 2022-03-11 | 东莞市宇瞳光学科技股份有限公司 | Fixed focus lens |
| CN114488493A (en) * | 2022-04-18 | 2022-05-13 | 江西联益光学有限公司 | Optical lens |
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2022
- 2022-08-09 CN CN202210949805.5A patent/CN115016104B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005352060A (en) * | 2004-06-09 | 2005-12-22 | Fujinon Corp | Small-size wide-angle lens with large aperture and camera equipped with same |
| US20220026671A1 (en) * | 2020-07-27 | 2022-01-27 | Changzhou Raytech Optronics Co., Ltd. | Camera optical lens |
| CN113204103A (en) * | 2021-05-18 | 2021-08-03 | 广东旭业光电科技股份有限公司 | Optical imaging lens and camera device |
| CN113589478A (en) * | 2021-07-12 | 2021-11-02 | 浙江大华技术股份有限公司 | Lens |
| CN216013795U (en) * | 2021-09-30 | 2022-03-11 | 东莞市宇瞳光学科技股份有限公司 | Fixed focus lens |
| CN114488493A (en) * | 2022-04-18 | 2022-05-13 | 江西联益光学有限公司 | Optical lens |
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