CN114967065A - Lens and camera device - Google Patents
Lens and camera device Download PDFInfo
- Publication number
- CN114967065A CN114967065A CN202210829495.3A CN202210829495A CN114967065A CN 114967065 A CN114967065 A CN 114967065A CN 202210829495 A CN202210829495 A CN 202210829495A CN 114967065 A CN114967065 A CN 114967065A
- Authority
- CN
- China
- Prior art keywords
- lens
- power lens
- positive
- negative
- focal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
-
- 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
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
-
- 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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention discloses a lens and a camera device, which are composed of a first negative focal power lens, a second negative focal power lens, a first positive focal power lens, a second positive focal power lens, an aperture diaphragm, a third positive focal power lens, a third negative focal power lens, a fourth positive focal power lens, a fourth negative focal power lens, an optical filter and an image plane which are sequentially arranged from an object side to an image side; the lens satisfies the following conditions:
wherein f4 is the focal length of the second positive power lens, f is the focal length of the lens, and the FOV is the angle of view of the lens. The optical lens with high resolution and the characteristics of miniaturization, low cost, good temperature stability and the like is realized.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a lens and a camera device.
Background
Thanks to the rapid development of the field of intelligent security in recent years, the optical lens is increasingly applied to the field of security, and particularly in the fields of intelligent buildings, intelligent traffic and the like, the pixel requirement of the optical imaging lens is higher and higher. More and more enterprises are beginning to invest more research in ultra high definition, and are expecting to develop products with higher pixels and smaller sizes.
For an optical lens, the use of the plastic lens can greatly reduce the volume of the product and the price of the product. More and more large batches of lenses are moving towards a mix of glass and plastic lenses. Moreover, the aspheric surface introduced by the plastic lens can improve the imaging quality to a certain extent.
With the rapid development of the security field, the following problems still exist in the existing optical imaging lens: 1. the existing fixed focus optical lens has a small imaging target surface, and most of the imaging target surface is concentrated on 1/2.7 inch or less. 2. 8, 9 or even more optical lenses are adopted, the imaging quality is improved, the size of the whole lens is increased, and the design requirement of miniaturization cannot be met. 3. The volume production uniformity of improvement product that the plastic lens can be very big, the use of plastic lens will very big cost that reduces the camera lens. The condition of poor temperature stability is easily appeared in the current general camera lens that uses glass to mould to mix in the market. 4. The conventional fixed focus lens on the market has a small aperture and the F number is F1.2 or more.
Therefore, there is a need for an optical lens with high resolution, small size, low cost, and good temperature stability.
Disclosure of Invention
The embodiment of the invention provides a lens and a camera device, and aims to provide an optical lens which has the characteristics of high resolving power, miniaturization, low cost, good temperature stability and the like.
The embodiment of the present invention provides a lens, which is formed by sequentially arranging a first negative power lens, a second negative power lens, a first positive power lens, a second positive power lens, an aperture stop, a third positive power lens, a third negative power lens, a fourth positive power lens, a fourth negative power lens, an optical filter and an image plane from an object side to an image side;
the lens satisfies the following conditions:
wherein f is 4 F is the focal length of the second positive focal power lens, f is the focal length of the lens, and FOV is the angle of view of the lens.
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 second negative-power lens is a meniscus lens, and one surface of the second negative-power lens, which faces the object side, is a concave 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 biconvex lens;
the third positive focal power lens is a biconvex lens;
the third negative focal power lens is a biconcave lens;
the fourth positive focal power lens is a biconvex lens;
the fourth negative power lens is a meniscus lens, and one surface of the fourth negative power lens facing the object side is a convex surface.
Furthermore, the first negative focal power lens, the second negative focal power lens and the fourth negative focal power lens are plastic aspheric lenses;
the first positive focal power lens is a glass aspheric lens;
the second positive focal power lens, the third negative focal power lens and the fourth positive focal power lens are glass spherical lenses.
Further, the third negative power lens and the fourth positive power lens constitute a cemented lens group.
Further, the central curvature radius R6 of the image side surface of the first positive power lens and the central curvature radius R7 of the object side surface of the second positive power lens satisfy:
。
further, a focal length f of the first positive power lens 3 And the distance TTL from the object surface side of the first negative power lens to the image surface satisfies the following conditions: f is not less than 1.5 3 /TTL≤2.0。
Further, f of the focal length of the first negative power lens 1 F of the focal length of the first positive power lens 3 F of the focal length of the second positive power lens 4 Satisfies the following conditions: f. of 1 ≤-16；f 3 ≤65；f 4 ≤31。
Further, the Abbe number Vd of the first negative power lens 1 Abbe number Vd of second positive power lens 4 Abbe number Vd of fourth negative power lens 8 Satisfies the following conditions: vd 1 ≤58；Vd 4 ≥83；Vd 8 ≤61。
Further, the refractive index Nd of the third positive power lens 5 Refractive index Nd of third negative power lens 6 Refractive index Nd of fourth negative power lens 8 Satisfies the following conditions: nd (neodymium) 5 ≤1.65；Nd 6 ≤1.71；Nd 8 ≤1.63。
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 an image pickup device, wherein the lens consists of a first negative focal power lens, a second negative focal power lens, a first positive focal power lens, a second positive focal power lens, an aperture diaphragm, a third positive focal power lens, a third negative focal power lens, a fourth positive focal power lens, a fourth negative focal power lens, an optical filter and an image plane which are sequentially arranged from an object side to an image side; the lens satisfies the following conditions:
wherein f is 4 F is the focal length of the second positive focal power lens, f is the focal length of the lens, and FOV is the angle of view of the lens.
Since in the embodiment of the present invention, 8 lenses of specific power are arranged in the lens in order from the object side to the image side in a specific order, and the lenses in the lens satisfy:
(ii) a Wherein f4 is the focal length of the second positive power lens, f is the focal length of the lens, and the FOV is the angle of view of the lens. Realizes high resolution, miniaturization, low cost and high temperatureThe degree stability is good.
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 shown in embodiment 1 of the present invention in a normal temperature state in a visible light band;
fig. 3 is a field curvature and distortion diagram of the lens shown in embodiment 1 of the present invention in the visible light band;
fig. 4 is a transverse fan diagram of the lens shown in embodiment 1 of the present invention in the visible light band;
fig. 5 is a dot arrangement diagram of a lens barrel in a visible light band according to embodiment 1 of the present invention;
fig. 6 is a graph of an optical transfer function (MTF) of the lens shown in embodiment 2 of the present invention in a normal temperature state in a visible light band;
fig. 7 is a graph of curvature of field and distortion of a lens in a visible light band according to embodiment 2 of the present invention;
fig. 8 is a transverse fan diagram of the lens shown in embodiment 2 of the present invention in the visible light band;
fig. 9 is a dot-column diagram of a lens in a visible light band according to embodiment 2 of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings, in which it is apparent that the described embodiments are only some, but not all embodiments of the invention. 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, which includes, in order from an object side to an image side, a first negative power lens L1, a second negative power lens L2, a first positive power lens L3, a second positive power lens L4, an aperture stop P, a third positive power lens L5, a third negative power lens L6, a fourth positive power lens L7, a fourth negative power lens L8, a filter M, and an image plane N;
the lens satisfies the following conditions:
wherein f is 4 F is the focal length of the second positive focal power lens, f is the focal length of the lens, and FOV is the angle of view of the lens.
The aperture size of the aperture diaphragm P 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 aperture value of the system can be changed and the depth of field can be changed.
Since in the embodiment of the present invention, 8 lenses of specific power are arranged in the lens in order from the object side to the image side in a specific order, and the lenses in the lens satisfy:
(ii) a Wherein f4 is the focal length of the second positive power lens, f is the focal length of the lens, and the FOV is the angle of view of the lens. The optical lens has the characteristics of high resolving power, miniaturization, low cost, good temperature stability 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 L1 is a meniscus lens, and one surface of the meniscus lens facing the object side is a convex surface;
the second negative power lens L2 is a meniscus lens, and its surface facing the object side is a concave surface;
the first positive power lens L3 is a meniscus lens, and its surface facing the object side is a convex surface;
the second positive power lens L4 is a biconvex lens;
the third positive power lens L5 is a biconvex lens;
the third negative power lens L6 is a biconcave lens;
the fourth positive power lens L7 is a biconvex lens;
the fourth negative power lens L8 is a meniscus lens, and its surface facing the object side is a convex surface.
In order to make the lens processing performance better, in the embodiment of the present invention, the first negative power lens L1, the second negative power lens L2, and the fourth negative power lens L8 are plastic aspheric lenses; the first positive power lens L3 is a glass aspheric lens; the second positive power lens L4, the third positive power lens L5, the third negative power lens L6 and the fourth positive power lens L7 are glass spherical lenses.
In order to further enable the system to be compact, in the embodiment of the present invention, the third negative power lens L6 and the fourth positive power lens L7 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 R6 of the image side surface of the first positive power lens and the central curvature radius R7 of the object side surface of the second positive power lens satisfy the following conditions:
。
to further enable the system to be compact, in an embodiment of the invention, the focal length f of the first positive power lens 3 And the distance TTL from the object surface side of the first negative power lens to the image surface satisfies the following conditions: f is not less than 1.5 3 /TTL≤2.0。
In order to further improve the imaging quality of the lens, in the embodiment of the invention, f of the focal length of the first negative-power lens 1 F of the focal length of the first positive power lens 3 F of the focal length of the second positive power lens 4 Satisfies the following conditions: f. of 1 ≤-16；f 3 ≤65；f 4 ≤31。
In the inventionIn the embodiment of the invention, in order to clearly image in a large temperature range of the lens, in the embodiment of the invention, the abbe number Vd of the first negative power lens 1 Abbe number Vd of second positive power lens 4 Abbe number Vd of fourth negative power lens 8 Satisfies the following conditions: vd 1 ≤58；Vd 4 ≥83；Vd 8 Is less than or equal to 61. In addition, the following are satisfied: vd 1 ≤58；Vd 4 ≥83；Vd 8 The color difference of the image can be reduced by less than or equal to 61, so that the imaging quality is improved.
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 third positive-power lens 5 Refractive index Nd of third negative power lens 6 Refractive index Nd of fourth negative power lens 8 Satisfies the following conditions: nd (neodymium) 5 ≤1.65；Nd 6 ≤1.71；Nd 8 Less than or equal to 1.63. And, satisfies: nd (neodymium) 5 ≤1.65；Nd 6 ≤1.71；Nd 8 The spherical aberration can be reduced by less than or equal to 1.63, and the imaging quality is improved.
In addition, an embodiment of the present invention provides an imaging apparatus including: the lens provided by the embodiment of the invention is adopted for imaging.
The optical performance of the lens provided by the embodiment of the invention is as follows:
the imaging target surface of the optical lens can support 1/1.8 inch at most, the imaging quality is ensured while the high resolution of the lens is effectively realized, and the optical lens can be applied to the environment of-30-80 ℃. The imaging can be used by a sensor which can support the target surface by 1/1.8 inch at the maximum, and the mechanical total length of a lens does not exceed 32 mm; the MTF value of the whole field reaches more than 0.5 under the condition of 100 lp/mm; the aperture is large, the F number is 1.0, and the device is particularly suitable for monitoring requirements under the condition of low illumination. Can meet the requirements at different temperatures.
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 barrel satisfy the conditions listed in table 1:
TABLE 1
Note that the mirror numbers in table 1 are the numbers of the left to right lenses in the schematic view of the lens configuration shown in fig. 1.
The lens L1, the lens L2, the lens L3 and the lens L8 in the embodiment of the present invention are aspheric lenses.
The aspheric conic coefficients can be defined by the following aspheric equation, but are not limited to the following representation:
wherein Z is the axial rise of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitting sphere, and the numerical value is the reciprocal of the curvature radius; k is a fitting cone coefficient; A-F are coefficients of 4 th, 6 th, 8 th, 10 th, 12 th and 14 th order terms of the aspheric polynomial.
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 30 mm;
focal length f of the lens: 5.8 mm;
angle of view of lens: 70.7 degrees;
optical distortion of the lens: -7.2%;
aperture of lens system: FNO is less than or equal to 0.85;
size of a lens image plane: phi 8.8 mm.
In the embodiment of the present invention, the focal length of the lens L4 is f 4 (ii) a Focal length f of the lens; the field angle of the lens is FOV, and the relationship is satisfied:
(ii) a The central curvature radius R6 of the image side surface of the lens L3 of the optical lens and the central curvature radius R7 of the object side surface of the lens L4 satisfy
(ii) a Focal length f of lens L3 of optical lens 3 Satisfies f with the total optical length TTL of the optical lens 3 TTL = 1.92; f of focal length of lens L1 of optical lens 1 = 18.93, f of focal length of lens L3 3 =57.18, f of the focal length of lens L4 4 = 16.64; abbe number Vd of lens L1 of optical lens 1 =55.77, abbe number Vd of lens L4 4 =81.59 abbe number Vd of lens L8 of optical lens 8 = 30.15; refractive index Nd of lens L5 of optical lens 5 Refractive index Nd of lens L6 =1.59 6 Refractive index Nd of lens L8 =1.64 8 =1.58。
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 3:
TABLE 3
Note that the mirror surface numbers in table 3 are the surface numbers of the lenses from left to right in the lens configuration diagram shown in fig. 1.
The lens L1, the lens L2, the lens L3 and the lens L8 in the embodiment of the present invention are aspheric lenses.
The aspheric conic coefficients can be defined by the following aspheric equation, but are not limited to the following representation:
wherein Z is the axial rise of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitting sphere, and the numerical value is the reciprocal of the curvature radius; k is a fitting cone coefficient; A-F are coefficients of 4 th, 6 th, 8 th, 10 th, 12 th and 14 th order of aspheric polynomial.
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 30 mm;
focal length f of the lens: 6.0 mm;
angle of view of lens: 70.8 degrees;
optical distortion of the lens: 5.0 percent;
aperture of lens system: FNO is less than or equal to 0.85;
size of a lens image plane: phi 8.8 mm.
In the embodiment of the present invention, the focal length of the lens L4 is f 4 (ii) a Focal length f of the lens; the field angle of the lens is FOV and satisfies the relation:
(ii) a The center curvature radius R6 of the image side of the lens L3 of the optical lens and the center curvature radius R7 of the object side of the lens L4 satisfy
(ii) a Focal length f of lens L3 of optical lens 3 And the total optical length TTL of the optical lens satisfies f 3 TTL = 1.58; f of focal length of lens L1 of optical lens 1 = 23.02, f of focal length of lens L3 3 =47.60, f of focal length of lens L4 4 = 29.55; abbe number Vd of lens L1 of optical lens 1 =30.77, abbe number Vd of lens L4 4 =55.77, abbe number Vd of lens L8 of optical lens 8 = 55.77; refractive index Nd of lens L5 of optical lens 5 Refractive index Nd of lens L6 =1.59 6 Refractive index Nd of lens L8 =1.64 8 =1.53。
In summary, examples 1 to 2 each satisfy the relationship shown in table 5 below.
TABLE 5
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 the imaging system in a more accurate, visual and common mode, the higher and smoother curve of the optical transfer function shows that the imaging quality of the system is better, and various aberrations (such as spherical aberration, coma aberration, astigmatism, field curvature, axial chromatic aberration, vertical axis chromatic aberration and the like) are 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;
as shown in fig. 6, a graph of an optical transfer function (MTF) of the lens provided in embodiment 2 of the present invention in a normal temperature state of 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.
Here, PX, PY in fig. 4 and 8 represent normalized pupil coordinates in the X direction and the Y direction, respectively, and EX, EY represent aberration coordinates in the X direction and the Y direction, respectively.
As can be seen from fig. 2 and fig. 6, the graphs of optical transfer functions (MTF) of the imaging system at room temperature in the visible light region are smooth and concentrated, the average MTF value in the full field of view (half image height Y '= 4.4 mm) of example 1 reaches 0.5, and the average MTF value in the full field of view (half image height Y' =4.4 mm) of above example 2 reaches 0.5 or more; therefore, the imaging system provided by the embodiment can meet higher imaging requirements.
As can be seen from fig. 3 and 7, the field curvature of the imaging system is controlled to within ± 0.05 mm. As can be seen from fig. 3, the field curvature of the fixed-focus lens provided in embodiment 1 of the present invention is within 0.05mm, and as can be seen from fig. 7, the field curvature of the fixed-focus lens provided in embodiment 2 of the present invention is within 0.05 mm. The curvature of field is also called as "field curvature". When the lens has field curvature, the intersection point of the whole light beam is not coincident 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 meridian 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 data measures distances measured in a plane perpendicular to the meridian plane, the baseline 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 longitudinal axis, since the curve is always normalized by the maximum radial field of view.
It can be seen from fig. 3 and 7 that the imaging system distortion control is better, within-7.2%, and fig. 3 and 7 both refer to multiple wavelength (0.4861um, 0.5876um, and 0.6563um) designs. 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, the distortion of the fixed focus lens provided in embodiment 1 of the present invention is only-7.2%, and the distortion of the fixed focus lens provided in embodiment 2 of the present invention is only 5.0%, so that 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 distortion caused by the distortion can be corrected by the 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 the chromatic dispersion of the imaging system are better controlled.
As can be seen from fig. 5 and 9, the imaging system has a small spot radius, is relatively concentrated, and has good corresponding aberration and coma.
In summary, the embodiments of the present invention provide an optical lens with low cost, large target surface, large aperture and high imaging definition. The imaging system adopts 8 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 imaging system can realize better distortion control and excellent imaging characteristics through the distribution and combination of specific optical powers of the optical lenses.
The embodiment of the invention provides a lens and an image pickup device, wherein the lens consists of a first negative focal power lens, a second negative focal power lens, a first positive focal power lens, a second positive focal power lens, an aperture diaphragm, a third positive focal power lens, a third negative focal power lens, a fourth positive focal power lens, a fourth negative focal power lens, an optical filter and an image plane which are sequentially arranged from an object side to an image side; the lens satisfies the following conditions:
wherein f is 4 F is the focal length of the second positive focal power lens, f is the focal length of the lens, and FOV is the angle of view of the lens.
Since in the embodiment of the present invention, 8 lenses of specific power are arranged in the lens in order from the object side to the image side in a specific order, and the lenses in the lens satisfy:
(ii) a Wherein f4 is the focal length of the second positive power lens, f is the focal length of the lens, and the FOV is the angle of view of the lens. The optical lens has the characteristics of high resolving power, miniaturization, low cost, good temperature stability 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. 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 the lens consists of a first negative focal power lens, a second negative focal power lens, a first positive focal power lens, a second positive focal power lens, an aperture diaphragm, a third positive focal power lens, a third negative focal power lens, a fourth positive focal power lens, a fourth negative focal power lens, an optical filter and an image plane which are sequentially arranged from an object side to an image side;
the lens satisfies the following conditions:
wherein f is 4 F is the focal length of the second positive focal power lens, f is the focal length of the lens, and FOV is the angle of view of the lens.
2. The lens barrel as claimed in 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 second negative-power lens is a meniscus lens, and one surface of the second negative-power lens, which faces the object side, is a concave surface;
the first positive power lens is a meniscus lens, and one surface of the first positive power lens facing the object side is a convex surface;
the second positive focal power lens is a biconvex lens;
the third positive focal power lens is a biconvex lens;
the third negative focal power lens is a biconcave lens;
the fourth positive focal power lens is a biconvex lens;
the fourth negative power lens is a meniscus lens, and one surface of the fourth negative power lens facing the object side is a convex surface.
3. The lens barrel as claimed in claim 1, wherein the first negative power lens, the second negative power lens and the fourth negative power lens are plastic aspherical lenses;
the first positive focal power lens is a glass aspheric lens;
the second positive focal power lens, the third negative focal power lens and the fourth positive focal power lens are glass spherical lenses.
4. The lens barrel according to claim 1, wherein the third negative power lens and the fourth positive power lens constitute a cemented lens group.
5. The lens barrel as claimed in claim 1, wherein a center radius of curvature R6 of the image side surface of the first positive power lens and a center radius of curvature R7 of the object side surface of the second positive power lens satisfy:
。
6. the lens barrel as claimed in claim 1, wherein a focal length f of the first positive power lens 3 And the distance TTL from the object surface side of the first negative power lens to the image surface satisfies the following conditions: f is not less than 1.5 3 /TTL≤2.0。
7. The lens barrel according to claim 1, wherein f of a focal length of the first negative power lens 1 F of the focal length of the first positive power lens 3 F of the focal length of the second positive power lens 4 Satisfies the following conditions: f. of 1 ≤-16；f 3 ≤65；f 4 ≤31。
8. The lens barrel as claimed in claim 1, wherein the first negative power lens has an abbe number Vd 1 Abbe number Vd of second positive power lens 4 Abbe number Vd of fourth negative power lens 8 Satisfies the following conditions: vd 1 ≤58；Vd 4 ≥83；Vd 8 ≤61。
9. The lens barrel according to claim 1, wherein a refractive index Nd of the third positive power lens 5 Refractive index Nd of third negative power lens 6 Refractive index Nd of fourth negative power lens 8 Satisfies the following conditions: nd (neodymium) 5 ≤1.65；Nd 6 ≤1.71；Nd 8 ≤1.63。
10. An imaging apparatus, comprising: imaging is performed using the lens barrel of any one of the above claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210829495.3A CN114967065B (en) | 2022-07-15 | 2022-07-15 | Lens and camera device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210829495.3A CN114967065B (en) | 2022-07-15 | 2022-07-15 | Lens and camera device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114967065A true CN114967065A (en) | 2022-08-30 |
| CN114967065B CN114967065B (en) | 2022-10-25 |
Family
ID=82969572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210829495.3A Active CN114967065B (en) | 2022-07-15 | 2022-07-15 | Lens and camera device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114967065B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110554478A (en) * | 2018-05-31 | 2019-12-10 | 光芒光学股份有限公司 | lens and manufacturing method thereof |
| CN112305725A (en) * | 2020-11-02 | 2021-02-02 | 舜宇光学(中山)有限公司 | Fixed focus lens |
| CN112698494A (en) * | 2020-12-30 | 2021-04-23 | 诚瑞光学(苏州)有限公司 | Image pickup optical lens |
| CN114063261A (en) * | 2021-12-08 | 2022-02-18 | 舜宇光学(中山)有限公司 | Fixed focus lens |
| CN114236772A (en) * | 2021-12-29 | 2022-03-25 | 浙江大华技术股份有限公司 | Lens |
-
2022
- 2022-07-15 CN CN202210829495.3A patent/CN114967065B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110554478A (en) * | 2018-05-31 | 2019-12-10 | 光芒光学股份有限公司 | lens and manufacturing method thereof |
| CN112305725A (en) * | 2020-11-02 | 2021-02-02 | 舜宇光学(中山)有限公司 | Fixed focus lens |
| CN112698494A (en) * | 2020-12-30 | 2021-04-23 | 诚瑞光学(苏州)有限公司 | Image pickup optical lens |
| CN114063261A (en) * | 2021-12-08 | 2022-02-18 | 舜宇光学(中山)有限公司 | Fixed focus lens |
| CN114236772A (en) * | 2021-12-29 | 2022-03-25 | 浙江大华技术股份有限公司 | Lens |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114967065B (en) | 2022-10-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113589478B (en) | Lens | |
| CN113777765B (en) | Lens barrel | |
| CN114167578B (en) | Lens | |
| CN111830677A (en) | Lens | |
| CN114167580A (en) | Lens | |
| CN114236772B (en) | Lens | |
| CN114217412B (en) | Lens | |
| CN114167579B (en) | Lens | |
| CN114859532B (en) | Lens and camera device | |
| CN113589503B (en) | Lens barrel | |
| CN111897090B (en) | Lens | |
| CN114967065B (en) | Lens and camera device | |
| CN114924395B (en) | Lens and camera device | |
| CN114185156B (en) | Lens | |
| CN115016104B (en) | Lens and camera device | |
| CN111221103A (en) | Lens | |
| CN115291359A (en) | Lens and camera device | |
| CN115291361A (en) | Lens and camera device | |
| CN114236771B (en) | Lens | |
| CN111897091B (en) | Lens | |
| CN113741016B (en) | Lens | |
| CN113325546B (en) | Lens | |
| CN114924384B (en) | Lens and camera device | |
| CN219552750U (en) | Fixed focus lens | |
| CN107861226A (en) | A kind of low distortion pick-up lens of big visual field |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |