CN114779433B - Short-distance wide-viewing angle imaging lens group - Google Patents
Short-distance wide-viewing angle imaging lens group Download PDFInfo
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- CN114779433B CN114779433B CN202210234080.1A CN202210234080A CN114779433B CN 114779433 B CN114779433 B CN 114779433B CN 202210234080 A CN202210234080 A CN 202210234080A CN 114779433 B CN114779433 B CN 114779433B
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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
- 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
- G02B13/0035—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 three lenses
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
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- Optics & Photonics (AREA)
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Abstract
The invention provides a short-distance wide-view imaging lens group, which sequentially comprises the following components from an object side to an image side: a first lens having negative optical power, an aperture, a second lens having positive optical power, and a third lens having positive optical power. The short-distance wide-view imaging lens group is suitable for a short-distance shooting device, has good wide-view imaging effect, and the maximum half-view angle can reach about 57 degrees. The three lenses are adopted to be matched for imaging structurally, the number of the lenses is small, the production cost is reduced, the total length TTL of the system can be reduced to about 0.9mm, the miniaturization is guaranteed, the half field angle is improved, the ultra-wide angle characteristic is realized, various aberrations are effectively corrected, and the imaging quality is improved.
Description
Technical Field
The invention relates to the technical field of optical lenses, in particular to a short-distance wide-viewing angle imaging lens group.
Background
With the development of technology, the near-field photographing device is gradually developed, the optical system photosensitive element of the near-field photographing device is not limited to the photosensitive coupling element or the complementary metal oxide semiconductor element, and with the refinement of the semiconductor processing technology, the pixel size of the photosensitive element is reduced, and the optical system tends to be higher in pixel and imaging quality.
In order to meet this trend, high image quality, miniaturization, and wide angle are also demanded for a close-range imaging device mounted on an imaging device such as a mobile phone, a digital camera, an automobile, or a monitor. In order to realize ultra-wide angle, the number of lens sheets is easy to increase, which is not beneficial to miniaturization and light weight of the lens; at the same time, the reduction of various aberrations is limited, which is unfavorable for improving the imaging quality.
Disclosure of Invention
Aiming at the problems, the invention provides the short-distance wide-view imaging lens group, which is beneficial to ensuring miniaturization, improving half-view angle, realizing ultra-wide angle characteristic, effectively correcting various aberrations and improving imaging quality.
In order to achieve the above purpose, the present invention solves the problems by the following technical scheme:
a short-distance wide-angle imaging lens group includes, in order from an object side to an image side: a first lens, an aperture, a second lens and a third lens. The invention adopts only three lenses to match imaging, has less lenses, is beneficial to reducing the production cost, has the total length TTL of the system reduced to about 0.9mm, is beneficial to reducing the overall total length of the wide-angle imaging lens group, and has better light receiving effect.
The first lens has negative focal power, the object side paraxial region of the first lens is a convex surface, and the image side paraxial region of the first lens is a concave surface. Therefore, the incident light with a larger angle range can be received, the light receiving range of the wide-angle imaging lens group is improved, and the maximum half-field angle can reach about 57 degrees through test.
In addition, an aperture is arranged between the first lens and the second lens to reduce stray light.
The second lens has positive focal power, and the object side surface of the second lens is a convex surface at the paraxial region.
The third lens has positive focal power, and the object side surface of the third lens is a convex surface at the paraxial region.
The first lens has negative focal power, the second lens and the third lens have positive focal power, so that the angle of view and the curvature of field can be effectively enlarged.
In a preferred embodiment, the second lens element has a convex image-side paraxial region and the third lens element has a convex image-side paraxial region.
In a preferred embodiment, the second lens element has a concave surface at an image-side paraxial region thereof, and the third lens element has a concave surface at an image-side paraxial region thereof.
In a preferred embodiment, the second lens element has a convex image-side paraxial region and the third lens element has a concave image-side paraxial region.
As a preferred embodiment, the short-distance wide-angle imaging lens group satisfies the following condition: |f1| > f2; |f1| > f3;0.3mm < f <0.8mm; wherein f is an effective focal length of the short-distance wide-angle imaging lens group, f1 is a focal length of the first lens, f2 is a focal length of the second lens, and f3 is a focal length of the fourth lens. By properly adjusting the focal length of each lens and the effective focal length of the wide-angle imaging lens group, correction of astigmatism can be facilitated.
As a preferred embodiment, the short-distance wide-angle imaging lens group satisfies the following condition: 4< FNo <13, wherein FNo is the aperture value of the short-distance wide-angle imaging lens group.
As a preferred embodiment, the short-distance wide-angle imaging lens group satisfies the following condition: 48 degrees < HFOV <57 degrees, wherein HFOV is the half field angle of the close range wide angle imaging lens set.
In a preferred embodiment, the refractive index and the dispersion coefficient of the first lens, the second lens, and the third lens are the same.
The beneficial effects of the invention are as follows:
the imaging lens group is suitable for a close-range shooting device, has good wide-view imaging effect, and the maximum half-view angle can reach about 57 degrees. The imaging lens has the advantages that only five lenses are adopted for matching imaging structurally, the number of lenses is small, the production cost is reduced, the total length TTL of the system can be reduced to about 1mm, the miniaturization is guaranteed, the half field angle is improved, the ultra-wide angle characteristic is realized, various aberrations are effectively corrected, and the imaging quality is improved.
Drawings
Fig. 1 is a schematic structural diagram of a proximity detector of embodiment 1.
Fig. 2 is a curvature of field aberration diagram of the wide angle imaging lens system of embodiment 1.
Fig. 3 is a distortion aberration diagram of the wide angle imaging lens group of embodiment 1.
Fig. 4 is a longitudinal spherical aberration diagram of a wide angle imaging lens group of embodiment 1.
Fig. 5 is a schematic structural diagram of a proximity detector of embodiment 2.
Fig. 6 is a curvature of field aberration diagram of the wide angle imaging lens system of embodiment 2.
Fig. 7 is a distortion aberration diagram of the wide angle imaging lens group of embodiment 2.
Fig. 8 is a longitudinal spherical aberration diagram of a wide angle imaging lens group of embodiment 2.
Fig. 9 is a schematic diagram of the structure of the proximity detector of embodiment 3.
Fig. 10 is a curvature of field aberration diagram of the wide angle imaging lens system of embodiment 3.
Fig. 11 is a distortion aberration diagram of the wide angle imaging lens group of embodiment 3.
Fig. 12 is a longitudinal spherical aberration diagram of a wide angle imaging lens group of embodiment 3.
The reference numerals are: a first lens 10, an aperture stop 20, a second lens 30, a third lens 40, and an imaging surface 50.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Example 1
Fig. 1 is a schematic structural diagram of a wide-angle imaging lens assembly according to embodiment 1 of the present invention. FIG. 2 is a Field curvature (Field) aberration diagram of a wide angle imaging lens assembly of the present invention. Fig. 3 is a Distortion (aberrations) chart of the wide angle imaging lens system of the present invention. Fig. 4 is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration) of a wide angle imaging lens assembly of the present invention.
As shown in fig. 1, the wide-angle imaging lens group of embodiment 1 includes, in order from the object side to the image side, a first lens 10, an aperture stop 20, a second lens 30, a third lens 40, and an imaging surface 50 is provided on the other side of the third lens 40.
The first lens element 10 has a negative refractive power, wherein the first lens element 10 is made of plastic, an object-side surface L1a of the first lens element 10 is convex at a paraxial region thereof, an image-side surface L1b of the first lens element 10 is concave at a paraxial region thereof, and both the object-side surface L1a and the image-side surface L1b of the first lens element 10 are aspheric;
an aperture 20;
the second lens element 30 with positive refractive power is made of plastic, wherein an object-side surface L2a of the second lens element 30 is convex at a paraxial region thereof, and an image-side surface L2b of the second lens element 30 is convex at a paraxial region thereof;
the third lens element 40 has positive refractive power, and is made of plastic, wherein an object-side surface L3a of the third lens element 40 is convex at a paraxial region thereof, and an image-side surface L3b of the third lens element 40 is convex at a paraxial region thereof.
Preferably, the wide-angle imaging lens group satisfies the following condition:
4<Fno<13；
wherein FNo is the aperture value of the wide-angle imaging lens group.
Preferably, the wide-angle imaging lens group satisfies the following condition:
48 degrees < HFOV <57 degrees;
wherein the HFOV is the half field angle of the wide angle imaging lens assembly.
Preferably, the refractive index and the dispersion coefficient of the first lens 10, the second lens 30, and the third lens 40 are the same.
The curve equation of the aspherical surface of each lens is expressed as follows:
wherein, X: the distance between the point on the aspheric surface, which is Y from the optical axis, and the tangent plane of the optical axis;
y: a perpendicular distance between a point on the aspherical surface and the optical axis;
r: radius of curvature of the lens at paraxial region;
k: conical surface coefficient;
A i : the i-th order aspheric coefficient.
The effective focal length of the wide-angle imaging lens group 10 of embodiment 1 is F, the aperture value (F-number) is Fno, the total system length (Total Track Length) is TTL, and half of the maximum angle of view is HFOV (Half Field of View), which has the following values: f=0.327 mm, fno=4.730, ttl=1.02067 mm, hfov=56.32 degrees.
The focal length of the first lens 10 is f1, f1= -0.45mm, the focal length of the second lens 30 is f2, f2= 0.40mm, and the focal length of the third lens 40 is f3, f3= 0.40mm.
Please refer to the following table 1, which is the detailed optical data of the wide-angle imaging lens set of embodiment 1 of the present invention. Wherein the object-side surface of the first lens element 10 is denoted by a surface L1a, the image-side surface thereof is denoted by a surface L1b, and so on; a lens surface denoted ASP in the table, e.g. the object-side surface 11a of the first lens 10, indicates that the surface is aspherical; the value of the distance field in the table represents the distance from the surface to the next surface, for example, the object-side surface to the image-side surface of the first lens 10 is 0.184mm, indicating that the thickness of the first lens 10 is 0.184mm. The distance from the image side surface of the first lens 10 to the aperture 20 is 0.138mm. The distance from the aperture 20 to the object side of the second lens 30 is-0.002 mm, indicating that the portion of the aperture 20 coincides with the object side of the second lens 30. The others can be analogized and will not be repeated below.
Please refer to table 2, which shows the aspherical coefficients of each lens surface of example 1 of the present invention. Wherein K is a cone coefficient in the aspherical curve equation, and A2 to A16 represent aspherical coefficients of the 2 nd to 16 th orders of each surface. For example, the object-side surface of the first lens element 10 has a conic coefficient K of-8.80E-01. The others can be analogized and will not be repeated below. In addition, the tables of the following embodiments correspond to the wide-angle imaging lens groups of the embodiments, and the definition of each table is the same as that of embodiment 1, so that the description of the following embodiments is omitted.
TABLE 1
TABLE 2
Example 2
Fig. 5 is a schematic structural diagram of a wide-angle imaging lens assembly according to embodiment 2 of the present invention. FIG. 6 is a Field curvature (Field) aberration diagram of a wide angle imaging lens assembly of the present invention. Fig. 7 is a Distortion (aberrations) chart of the wide angle imaging lens system of the present invention. Fig. 8 is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration) of a wide angle imaging lens assembly of the present invention.
As shown in fig. 5, the wide-angle imaging lens group of embodiment 2 includes, in order from the object side to the image side, a first lens 10, an aperture stop 20, a second lens 30, a third lens 40, and an imaging surface 50 is provided on the other side of the third lens 40.
The first lens element 10 has a negative refractive power, wherein the first lens element 10 is made of plastic, an object-side surface L1a of the first lens element 10 is convex at a paraxial region thereof, an image-side surface L1b of the first lens element 10 is concave at a paraxial region thereof, and both the object-side surface L1a and the image-side surface L1b of the first lens element 10 are aspheric;
an aperture 20;
the second lens element 30 with positive refractive power is made of plastic, wherein an object-side surface L2a of the second lens element 30 is convex at a paraxial region thereof, and an image-side surface L2b of the second lens element 30 is concave at a paraxial region thereof;
the third lens element 40 has positive refractive power, and is made of plastic, wherein an object-side surface L3a of the third lens element 40 is convex at a paraxial region thereof, and an image-side surface L3b of the third lens element 40 is concave at a paraxial region thereof.
Preferably, the wide-angle imaging lens group satisfies the following condition:
4<Fno<13；
wherein FNo is the aperture value of the wide-angle imaging lens group.
Preferably, the wide-angle imaging lens group satisfies the following condition:
48 degrees < HFOV <57 degrees;
wherein the HFOV is the half field angle of the wide angle imaging lens assembly.
Preferably, the refractive index and the dispersion coefficient of the first lens 10, the second lens 30, and the third lens 40 are the same.
The curve equation of the aspherical surface of each lens is expressed as follows:
wherein, X: the distance between the point on the aspheric surface, which is Y from the optical axis, and the tangent plane of the optical axis;
y: a perpendicular distance between a point on the aspherical surface and the optical axis;
r: radius of curvature of the lens at paraxial region;
k: conical surface coefficient;
A i : the i-th order aspheric coefficient.
The effective focal length of the wide-angle imaging lens group 10 of embodiment 1 is F, the aperture value (F-number) is Fno, the total system length (Total Track Length) is TTL, and half of the maximum angle of view is HFOV (Half Field of View), which has the following values: f=0.789 mm, fno=12.78, ttl=0.91600 mm, hfov=48.95 degrees.
The focal length of the first lens 10 is f1, f1= -11.76mm, the focal length of the second lens 30 is f2, f2=0.60 mm, and the focal length of the third lens 40 is f3, f3=0.47 mm.
Please refer to the following table 3, which is the detailed optical data of the wide-angle imaging lens set of example 2 of the present invention.
TABLE 3 Table 3
Example 3
Fig. 9 is a schematic structural diagram of a wide-angle imaging lens assembly according to embodiment 3 of the present invention. FIG. 10 is a Field curvature (Field) aberration diagram of a wide angle imaging lens assembly of the present invention. FIG. 11 is a Distortion (aberration) aberration diagram of a wide angle imaging lens assembly according to the present invention. Fig. 12 is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration) of a wide angle imaging lens assembly of the present invention.
As shown in fig. 9, the wide-angle imaging lens group of embodiment 3 includes, in order from the object side to the image side, a first lens 10, an aperture stop 20, a second lens 30, a third lens 40, and an imaging surface 50 is provided on the other side of the third lens 40.
The first lens element 10 has a negative refractive power, wherein the first lens element 10 is made of plastic, an object-side surface L1a of the first lens element 10 is convex at a paraxial region thereof, an image-side surface L1b of the first lens element 10 is concave at a paraxial region thereof, and both the object-side surface L1a and the image-side surface L1b of the first lens element 10 are aspheric;
an aperture 20;
the second lens element 30 with positive refractive power is made of plastic, wherein an object-side surface L2a of the second lens element 30 is convex at a paraxial region thereof, and an image-side surface L2b of the second lens element 30 is convex at a paraxial region thereof;
the third lens element 40 has positive refractive power, and is made of plastic, wherein an object-side surface L3a of the third lens element 40 is convex at a paraxial region thereof, and an image-side surface L3b of the third lens element 40 is concave at a paraxial region thereof.
Preferably, the wide-angle imaging lens group satisfies the following condition:
4<Fno<13；
wherein FNo is the aperture value of the wide-angle imaging lens group.
Preferably, the wide-angle imaging lens group satisfies the following condition:
48 degrees < HFOV <57 degrees;
wherein the HFOV is the half field angle of the wide angle imaging lens assembly.
Preferably, the refractive index and the dispersion coefficient of the first lens 10, the second lens 30, and the third lens 40 are the same.
The curve equation of the aspherical surface of each lens is expressed as follows:
wherein, X: the distance between the point on the aspheric surface, which is Y from the optical axis, and the tangent plane of the optical axis;
y: a perpendicular distance between a point on the aspherical surface and the optical axis;
r: radius of curvature of the lens at paraxial region;
k: conical surface coefficient;
A i : the i-th order aspheric coefficient.
The effective focal length of the wide-angle imaging lens group 10 of embodiment 1 is F, the aperture value (F-number) is Fno, the total system length (Total Track Length) is TTL, and half of the maximum angle of view is HFOV (Half Field of View), which has the following values: f=0.39995 mm, fno=5.78, ttl=0.99299mm, hfov= 56.59 degrees.
The focal length of the first lens 10 is f1, f1= -0.78mm, the focal length of the second lens 30 is f2, f2= 0.48mm, and the focal length of the third lens 40 is f3, f3= 0.61mm.
Please refer to the following table 4, which shows the detailed optical data of the wide-angle imaging lens set of example 3 of the present invention.
TABLE 4 Table 4
The above examples represent only 3 embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (5)
1. A short-range wide-angle imaging lens group characterized by an aperture value Fno <13, an angle of 48 < half-field angle HFOV <57 degrees, and a lens group comprising, in order from an object side to an image side: a first lens (10) having negative optical power, the object-side paraxial region of the first lens (10) being convex, the image-side paraxial region of the first lens (10) being concave; an aperture (20); a second lens (30) having positive optical power, the object-side paraxial region of the second lens (30) being convex; a third lens (40) having positive optical power, the object-side paraxial region of the third lens (40) being convex;
the short-distance wide-viewing angle imaging lens group satisfies the following conditions:
|f1|＞f2；
|f1| > f3; the method comprises the steps of,
0.3mm<f<0.8mm；
wherein f is the effective focal length of the short-distance wide-angle imaging lens group, f1 is the focal length of the first lens (10), f2 is the focal length of the second lens (30), and f3 is the focal length of the third lens (40).
2. A close-range wide-angle imaging lens group according to claim 1, wherein the second lens element (30) has a convex surface at the image-side paraxial region and the third lens element (40) has a convex surface at the image-side paraxial region.
3. A close-range wide-angle imaging lens group according to claim 1, wherein the second lens element (30) has a concave surface at the image-side paraxial region and the third lens element (40) has a concave surface at the image-side paraxial region.
4. A close-range wide-angle imaging lens group according to claim 1, wherein the image-side paraxial region of the second lens element (30) is convex and the image-side paraxial region of the third lens element (40) is concave.
5. A close-range wide-angle imaging lens group according to claim 1, wherein the refractive index and the dispersion coefficient of the first lens (10), the second lens (30) and the third lens (40) are the same.
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| CN202210234080.1A CN114779433B (en) | 2022-03-10 | 2022-03-10 | Short-distance wide-viewing angle imaging lens group |
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