CN111352212A - Large-view-field angle long-focus periscope lens - Google Patents
Large-view-field angle long-focus periscope lens Download PDFInfo
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- G—PHYSICS
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- 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
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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
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- G—PHYSICS
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- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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Abstract
The invention relates to a large-field-angle long-focus periscope lens, which sequentially comprises the following components from an object side to an image side: the first glass lens G1 with negative refractive power and a concave object side and a convex image side, wherein both surfaces are spherical; the reflecting surface and the optical axis form an included angle of 45 degrees; a second lens element with positive refractive power having a convex object-side surface and a concave image-side surface; a meniscus third lens element with negative refractive power having a concave image-side surface at paraxial region; a fourth lens element with negative refractive power having a concave object-side surface and a concave image-side surface at a paraxial region; the fifth lens element with positive refractive power has a convex image-side surface at paraxial region; the sixth lens element with negative refractive power has an M-shaped configuration and a reverse curvature on the image-side surface. A diaphragm is arranged between the prism and the second lens P2, the field angle FOV of the invention is larger than 71 degrees, the optical back focus is larger than 0.55, the periscopic function is realized, the high resolution is satisfied, and the invention is suitable for the configuration of the ultra-thin thickness of the mobile phone.
Description
Technical Field
The invention relates to an optical lens, in particular to a periscopic lens which is formed by combining a piece of spherical glass, a prism and a plastic non-spherical lens, has a long focal length and a chief ray angle larger than 30 degrees and is suitable for a light and thin mobile phone.
Background
The existing mobile phone camera requires high pixels, a large aperture, and mechanical structures such as high screen occupation ratio, light weight and thinness, at present, the screen occupation ratio of a smart phone is increasingly large, so that the installation space of a lens is narrower, and in order to adapt to the small space, a shooting mode can be changed to achieve the purpose, and meanwhile, the high pixels are met
Disclosure of Invention
The invention aims to provide a glass and prism periscopic lens which has a special structure, is formed by combining a spherical surface with a high refractive index and an aspheric plastic and ensures high pixels and small volume. The direction of an optical axis is changed through the prism, and the prism is combined with different lenses for use, so that the high resolution of the lens is ensured, and the light and thin configuration of the mobile phone is met.
In order to realize the purpose of the invention, the adopted technical scheme is as follows:
a large field angle long focus periscope lens, in order from object side to image side comprising:
the first glass lens G1 has negative refractive power, and has a concave object side and a convex image side, wherein both surfaces are spherical;
the included angle between the reflecting surface and the optical axis of the prism is 45 degrees;
the second lens element P2 with positive refractive power has a convex object-side surface at paraxial region and a concave image-side surface at paraxial region;
the third lens element P3 with negative refractive power has a meniscus shape with its image-side surface being concave at paraxial region;
the fourth lens element P4 with refractive power has a concave object-side surface and a concave image-side surface at paraxial region;
the fifth lens element P5 with positive refractive power has a convex image-side surface at paraxial region;
the sixth lens element P5 with negative refractive power has an M-shaped configuration and a reverse curvature on the image side;
the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are aspheric plastic lenses, the field angle FOV is larger than 71 degrees, the optical back focus is larger than 0.55 degrees, the maximum chief ray angle is larger than 33 degrees, the resolving power is improved through the combination of the spherical lens and the aspheric lens, the direction of an optical axis is changed by a 45-degree reflecting prism, the periscopic function is realized, a diaphragm is arranged between the prism and the second lens P2, and the chief ray angle is larger than 30;
the following conditional expressions are satisfied:
0.3<Rg1/Rg2<0.47
-2.4<Sag1-t1-t2-t3<-2.47
ts-tp＝0.12
1.74<TTL/imgh<1.81
-5.1<f3/f<-1.8
1.1<f5/f<1.65
-1.4<f/f6<-1.2
2.3<ct2/ct3<3.62
2.34<f4/f6<4.6
0.1<sag4-sag5<0.26
-2.7<R22/R21<-2
1.4<oal2/oal3<1.72
-8.6<R51/R42<4.35
0.9<(r16-r17)/(r16+r17)<1.4
bfl-sag6>0.55
wherein R isg1Is the concave curvature radius, R, of the glass lens G1g2The radius of curvature of the convex surface of the glass lens G1 is shown in the specification, sag1 is the rise of the edge of the concave surface of the glass lens G1, t1 is the central thickness of the lens G1, t2 is the spacing distance between the center of the lens G1 and the prism, and t3 is the linear distance from the center of the incident surface of the prism to the center of the inclined surface; ts is the distance from the diaphragm to the midpoint of the second lens, and tp is the distance between the light emergent surface of the prism and the diaphragm; TTL is the distance from the top point of the front end of the second lens to the image surface, and Imgh is half image height; f is the effective focal length of the lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens; the center thickness of the second lens is ct2, and the center thickness of the third lens is ct 3; sag4 and sag5 are fourth and fifth lens edge saggitals, respectively; r22 and R21 are the second lens image-side and object-side radii of curvature, respectively; r51 and R42 are the fifth lens object side radius of curvature and the fourth lens image side radius of curvature, respectively; oal2 is the length from the second lens center vertex to the fourth lens maximum vector height, oal3 is the length from the fifth lens object-side maximum vector height to the sixth lens image-side maximum vector height; r16 and R17 are radii of curvature of the object-side and image-side surfaces of the sixth lens, respectively; bfl is the distance from the last lens to the image plane, and sag6 is the maximum rise of the last lens.
The two surfaces of the glass lens G1 are spherical surfaces, and one surface is a convex surface; the optical reflection element is a 45-degree prism, the main ray angle is larger than 30 degrees, and the long-focus camera system is adopted.
The second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all even-order aspheric plastic lenses, and aspheric coefficients meet the following equation:
Z＝cy2/[1+{1－(1+k)c2y2}+1/2]+A4y4+A6y6+A8y8+A10y10+A12y12+A14y14+ A16y16
wherein Z is aspheric sagittal height, c is aspheric paraxial curvature, y is lens caliber, k is cone coefficient, A4Is a 4-order aspheric coefficient, A6Is a 6-degree aspheric surface coefficient, A8Is an 8 th order aspheric surface coefficient, A10Is a 10 th order aspheric surface coefficient, A12Is a 12 th order aspheric surface coefficient, A14Is a 14 th order aspheric coefficient, A16Is a 16-degree aspheric coefficient.
2.4< Sag1-t1-t2-t3< -2.47, wherein Sag1 is the rise of the edge of the concave surface of a glass lens G1, t1 is the central thickness of the lens G1, t2 is the spacing distance between the center of a lens G1 and a prism, and t3 is the straight-line distance from the center of the incident surface of the prism to the center of the inclined surface; the formula describes the linear distance from the maximum rise of G1 to the center of the hypotenuse of the prism, namely half of the width of the whole lens and 2.5 of the width, ensures that the sizes of the front end G1 of the lens, the prism part and the rear end aspheric lens part are correspondingly connected, limits the volume of the whole lens and enables the volume of the whole lens to be miniaturized.
ts-tp is 0.12, the formula is the position relation of the restriction diaphragm and the plastic lens P2, the diaphragm position tp is 0.04mm from the straight edge of the prism, the diaphragm is closely arranged on the prism, and if the diaphragm position tp is more than 0.04mm, the opening of the lens barrel in front of the diaphragm is in a horn shape.
1.74< TTL/imgh <1.81, wherein TTL is the distance from the top point of an aspheric lens p2 at the rear end of the prism to the image plane, so that the lens has the advantage of a large aperture, the imaging effect in a dark environment is enhanced, and the length of the lens is shortened.
The focal length f3 of the third lens and the effective focal length f of the lens meet-5.1 < f3/f < -1.8, and the formula effectively and reasonably distributes the optical power of the third lens and reduces tolerance sensitivity.
The focal length f5 of the fifth lens and the effective focal length f of the lens meet 1.1< f5/f <1.65, the included angle between the principal ray of the general prism camera system and the image plane is less than 20 degrees, and the included angle between the principal ray of the camera system and the image plane is more than 30 degrees at most.
The focal length and the effective focal length of the sixth lens meet-1.4 < f/f6< -1.2, and the focal length f4 of the fourth lens and the focal length f6 of the sixth lens meet 2.34< f4/f6<4.6, so that the formula is favorable for correcting the aberration of the system and simultaneously correcting the curvature of field of the marginal field.
The edge sags 4 of the fourth lens image side surface and the edge sags 5 of the fifth lens object side surface satisfy the formula 0.1< sag4-sag5<0.26, which limits the fourth lens and fifth lens edge separation;
the curvature radius R22 of the image side surface and the curvature radius R21 of the object side surface of the second lens meet-2.7 < R22/R21< -2;
the curvature radius r16 of the object side surface and the curvature radius r17 of the image side surface of the sixth lens satisfy (r16-r17)/(r16+ r 17);
the central thickness ct2 of the second lens and the central thickness of the third lens satisfy the formula 2.3< ct2/ct3< 3.62;
the curvature radius R51 of the object side surface of the fifth lens and the curvature radius of the image side surface of the fourth lens meet the formula-8.6 < R51/R42< 4.35;
the distance bfl from the center of the last lens to the image plane subtracts the maximum sag6 of the image side of the last lens, namely the optical back focus meets bfl-sag6>0.55, the above formula is the limitation of the optical back focus, and the system focusing is facilitated when the distance is larger than 0.55.
The invention has the advantages that:
1. the first lens G1 is double-spherical glass made of high-refractive-index materials, and one spherical surface is convex and the other spherical surface is concave, so that the determination of the spherical vertex and the manufacturing in the die pressing manufacturing are facilitated, and the manufacturing deviation is reduced. Meanwhile, the required range of the curvature radius can ensure that the lens is suitable for lens production.
2. The invention ensures that the sizes of the prism part at the front end of the lens and the non-spherical lens part at the rear end of the lens are correspondingly connected, limits the volume of the whole lens and miniaturizes the volume of the whole lens.
3. The invention enables the lens to have the advantage of large aperture, enhances the imaging effect in a dark environment and shortens the length of the lens.
4. The focal length f3 of the third lens and the effective focal length f of the lens meet-5.1 < f3/f < -1.8, the formula effectively and reasonably distributes the focal power of the third lens, reduces the chromatic aberration of the system, improves the image quality and reduces the tolerance sensitivity.
5. The focal length f5 of the fifth lens and the effective focal length f of the lens meet 1.1< f5/f <1.65, the included angle between the principal ray of a general prism photographic system and the image plane is less than 20 degrees, the included angle between the principal ray of the photographic system and the image plane is maximally more than 30 degrees, the formula is met, the reasonable distribution of focal power is facilitated, and the resolution capability of the marginal field of view is improved. And simultaneously satisfies the characteristics of long focal length and large chief ray angle of the system.
6. The focal length and the effective focal length of the sixth lens meet-1.4 < f/f6< -1.2, the focal length f4 of the fourth lens and the focal length f6 of the sixth lens meet 2.34< f4/f6<4.6, and the formula is favorable for correcting the aberration of the system, simultaneously correcting the field curvature of the marginal field of view, improving the integral resolution of the lens and meeting high pixel.
7. The edge rise sag4 of the image side surface of the fourth lens and the edge rise sag5 of the object side surface of the fifth lens meet the formula 0.1< sag4-sag5<0.26, the formula limits the edge interval of the fourth lens and the fifth lens, the above formula is met, the field curvature of the edge is favorably corrected, the edge brightness is improved, and the assembly tolerance of the fifth lens can be reduced.
8. The curvature radius R51 of the object side surface of the fifth lens and the curvature radius of the image side surface of the fourth lens meet the formula-8.6 < R51/R42<4.35, and the curvature radius R51 and the curvature radius of the image side surface of the fourth lens meet the formula, so that the reflection stray light between the fifth lens and the fourth lens can be reduced, and the assembly eccentricity sensitivity is reduced.
9. The structure and focal power of the invention shorten the length of the system and ensure the good resolving power of the marginal field of view. The mechanical structure is beneficial to production and assembly.
Drawings
Fig. 1 is a schematic structural diagram of a lens barrel of the present invention;
FIG. 2 is an optical path diagram of the lens of the present invention;
FIG. 3 is a defocus graph of the lens of embodiment 1 of the present invention, wherein the abscissa is the defocus value (unit um) and the ordinate is the diffraction value of the corresponding field of view;
fig. 4 is an astigmatic field curvature diagram of the lens of embodiment 1 of the present invention, in which the abscissa is a field curvature value and the ordinate is a field height;
FIG. 5 is a graph of optical distortion for a lens of example 1 of the present invention, wherein the distortion percentage is plotted on the abscissa and the image height of the field of view is plotted on the ordinate;
FIG. 6 is a schematic structural view of embodiment 2;
FIG. 7 is a defocus graph of the lens of embodiment 2 of the present invention, wherein the abscissa is the defocus value (in um) and the ordinate is the diffraction value of the corresponding field of view;
fig. 8 is an astigmatic field curvature diagram of the lens of embodiment 2 of the present invention, in which the abscissa is a field curvature value and the ordinate is a field height;
FIG. 9 is a graph of optical distortion for a lens of example 2 of the present invention, wherein the distortion percentage is plotted on the abscissa and the image height of the field of view is plotted on the ordinate;
FIG. 10 is a schematic structural view of embodiment 3;
FIG. 11 is a defocus graph of a lens of embodiment 3 of the present invention, in which the abscissa is the defocus value (unit um) and the ordinate is the diffraction value of the corresponding field of view;
fig. 12 is an astigmatic field curvature diagram of the lens of embodiment 3 of the present invention, in which the abscissa is the field curvature value and the ordinate is the field height;
FIG. 13 is a graph of optical distortion for a lens of example 3 of the present invention, wherein the distortion percentage is plotted on the abscissa and the image height of the field of view is plotted on the ordinate;
FIG. 14 is a schematic structural view of example 4;
FIG. 15 is a defocus graph of the lens of embodiment 4 of the present invention, in which the abscissa is the defocus value (unit um) and the ordinate is the diffraction value of the corresponding field of view;
fig. 16 is an astigmatic field curvature diagram of the lens of embodiment 4 of the present invention, in which the abscissa is the field curvature value and the ordinate is the field height;
FIG. 17 is a graph of optical distortion for a lens of example 4 of the present invention, wherein the distortion percentage is plotted on the abscissa and the image height of the field of view is plotted on the ordinate;
FIG. 18 is a schematic structural view of example 5;
FIG. 19 is a defocus graph of a lens of embodiment 5 of the present invention, in which the abscissa is an out-of-focus value (unit um) and the ordinate is a diffraction value of a corresponding field of view;
fig. 20 is an astigmatic field curvature diagram of the lens of embodiment 5 of the present invention, in which the abscissa is the field curvature value and the ordinate is the field height;
fig. 21 is a graph of optical distortion for a lens of example 5 of the present invention, where the abscissa is the distortion percentage and the ordinate is the field image height.
Detailed Description
The invention is described in further detail below with reference to the accompanying figures 1-21 of the specification.
A large field angle long focus periscope lens, in order from an object side to an image side, comprising:
the first glass lens G1 has negative refractive power, and has a concave object side and a convex image side, wherein both surfaces are spherical;
the included angle between the reflecting surface and the optical axis of the prism is 45 degrees;
the second lens element P2 with positive refractive power has a convex object-side surface at paraxial region and a concave image-side surface at paraxial region;
the third lens element P3 with negative refractive power has a meniscus shape with its image-side surface being concave at paraxial region;
the fourth lens element P4 with refractive power has a concave object-side surface and a concave image-side surface at paraxial region;
the fifth lens element P5 with positive refractive power has a convex image-side surface at paraxial region;
the sixth lens element P5 with negative refractive power has an M-shaped configuration and a reverse curvature on the image side;
the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are aspheric plastic lenses, the field angle FOV is larger than 71 degrees, the optical back focus is larger than 0.55 degrees, the maximum chief ray angle is larger than 33 degrees, the resolving power is improved through the combination of the spherical lens and the aspheric lens, the direction of an optical axis is changed by a 45-degree reflecting prism, the periscopic function is realized, a diaphragm is arranged between the prism and the second lens P2, and the chief ray angle is larger than 30;
the following conditional expressions are satisfied:
0.3<Rg1/Rg2<0.47
-2.4<Sag1-t1-t2-t3<-2.47
ts-tp＝0.12
1.74<TTL/imgh<1.81
-5.1<f3/f<-1.8
1.1<f5/f<1.65
-1.4<f/f6<-1.2
2.3<ct2/ct3<3.62
2.34<f4/f6<4.6
0.1<sag4-sag5<0.26
-2.7<R22/R21<-2
1.4<oal2/oal3<1.72
-8.6<R51/R42<4.35
0.9<(r16-r17)/(r16+r17)<1.4
bfl-sag6>0.55
wherein R isg1Is the concave curvature radius, R, of the glass lens G1g2The radius of curvature of the convex surface of the glass lens G1 is shown in the specification, sag1 is the rise of the edge of the concave surface of the glass lens G1, t1 is the central thickness of the lens G1, t2 is the spacing distance between the center of the lens G1 and the prism, and t3 is the linear distance from the center of the incident surface of the prism to the center of the inclined surface; ts is the distance from the diaphragm to the midpoint of the second lens, and tp is the distance between the light emergent surface of the prism and the diaphragm; TTL is the distance from the top point of the front end of the second lens to the image surface, and Imgh is half image height; f is the effective focal length of the lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens; the center thickness of the second lens is ct2, and the center thickness of the third lens is ct 3; sag4 and sag5 are fourth and fifth lenses, respectivelyEdge rise; r22 and R21 are the second lens image-side and object-side radii of curvature, respectively; r51 and R42 are the fifth lens object side radius of curvature and the fourth lens image side radius of curvature, respectively; oal2 is the length from the second lens center vertex to the fourth lens maximum vector height, oal3 is the length from the fifth lens object-side maximum vector height to the sixth lens image-side maximum vector height; r16 and R17 are radii of curvature of the object-side and image-side surfaces of the sixth lens, respectively; bfl is the distance from the last lens to the image plane, and sag6 is the maximum rise of the last lens.
The first lens G1 is double-spherical glass made of high-refractive-index material, and the curvature radius of the two spherical surfaces satisfies 0.3<Rg1/Rg2<0.47, the formula satisfies the requirement that one spherical surface is a convex surface and one spherical surface is a concave surface, thereby being beneficial to determining the spherical surface apex and manufacturing in the die pressing manufacturing and reducing the manufacturing deviation. Meanwhile, the required range of the curvature radius can ensure that the lens is suitable for lens production.
2.4< Sag1-t1-t2-t3< -2.47, wherein Sag1 is the rise of the edge of the concave surface of a glass lens G1, t1 is the central thickness of the lens G1, t2 is the spacing distance between the center of a lens G1 and a prism, and t3 is the straight-line distance from the center of the incident surface of the prism to the center of the inclined surface; the formula describes the linear distance from the maximum rise of G1 to the center of the hypotenuse of the prism, namely half of the width of the whole lens and 2.5 of the width, ensures that the sizes of the front end G1 of the lens, the prism part and the rear end aspheric lens part are correspondingly connected, limits the volume of the whole lens and enables the volume of the whole lens to be miniaturized.
ts-tp is 0.12, the formula is the position relation of the restriction diaphragm and the plastic lens P2, the diaphragm position tp is 0.04mm from the straight edge of the prism and is closely attached to the prism, if the diaphragm position tp is more than 0.04mm, the opening of the lens barrel in front of the diaphragm is in a horn shape, and the front end of the lens barrel is provided with the interference of the glass lens and the assembling part of the prism, so that the horn shape in front of the diaphragm can not be smoothly formed by the mold, and the diaphragm is closely attached to the prism.
1.74< TTL/imgh <1.81, wherein TTL is the distance from the top point of an aspheric lens p2 at the rear end of the prism to an image plane, and the design enables the lens to have the advantage of a large aperture in the process of increasing the light flux, so that the imaging effect in a dark environment is enhanced, and the length of the lens is shortened.
The focal length f3 of the third lens and the effective focal length f of the lens meet-5.1 < f3/f < -1.8, the formula effectively and reasonably distributes the focal power of the third lens, reduces the chromatic aberration of the system, improves the image quality and reduces the tolerance sensitivity.
The focal length f5 of the fifth lens and the effective focal length f of the lens meet 1.1< f5/f <1.65, the included angle between the principal ray of a general prism camera system and the image plane is less than 20 degrees, the included angle between the principal ray of the camera system and the image plane is maximally more than 30 degrees, the formula is met, the reasonable distribution of focal power is facilitated, and the resolution capability of the marginal field of view is improved. And simultaneously satisfies the characteristics of long focal length and large chief ray angle of the system.
The focal length and the effective focal length of the sixth lens meet-1.4 < f/f6< -1.2, the focal length f4 of the fourth lens and the focal length f6 of the sixth lens meet 2.34< f4/f6<4.6, and the formula is favorable for correcting the aberration of the system, simultaneously correcting the field curvature of the marginal field of view, improving the integral resolution of the lens and meeting high pixel.
The edge rise sag4 of the image side surface of the fourth lens and the edge rise sag5 of the object side surface of the fifth lens meet the formula 0.1< sag4-sag5<0.26, the formula limits the edge interval of the fourth lens and the fifth lens, the above formula is met, the field curvature of the edge is favorably corrected, the edge brightness is improved, and the assembly tolerance of the fifth lens can be reduced.
The curvature radius R22 of the image side surface and the curvature radius R21 of the object side surface of the second lens meet the requirement of-2.7 < R22/R21< -2, and the above formula is met, so that the spherical aberration and the astigmatism are reduced.
The radius of curvature r16 of the object-side surface and the radius of curvature r17 of the image-side surface of the sixth lens satisfy the above expression (r16-r17)/(r16+ r17), which contributes to the correction of the entire aberration of the imaging system.
The central thickness ct2 of the second lens and the central thickness of the third lens satisfy the formula 2.3< ct2/ct3<3.62, and the thickness ratio of the second lens and the third lens is limited, so that the third lens can be used for compensating the high-level aberration of the second lens, and the molding process and the assembly stability of the lens are facilitated.
The curvature radius R51 of the object side surface of the fifth lens and the curvature radius of the image side surface of the fourth lens meet the formula-8.6 < R51/R42<4.35, and the reflection stray light between the fifth lens and the fourth lens can be reduced and the assembly eccentricity sensitivity can be reduced by meeting the formula.
The total mechanical length of the second lens to the fourth lens (the maximum rise of the central vertex of the second lens to the image side surface of the fourth lens) and the total mechanical length of the fifth and sixth lens (the maximum rise of the object side surface of the fifth lens to the image side surface of the sixth lens) satisfy the following formula: the above formula 1.4< oal2/oal3<1.72 limits the mechanical structure and focal power of the camera system, shortens the length of the system and ensures good resolution of the fringe field. The mechanical structure is beneficial to production and assembly.
The distance bfl from the center of the last lens to the image plane subtracts the maximum sag6 of the image side of the last lens, namely the optical back focus meets bfl-sag6>0.55, the above formula is the limitation of the optical back focus, and the system focusing is facilitated when the distance is larger than 0.55.
Example 1
The invention relates to a periscopic lens combined by a spherical surface, an aspherical surface and a prism, which sequentially comprises the following components from an object side to an image side: a first glass lens G1 with negative refractive power having a concave object side and a convex image side, wherein both surfaces are spherical; the reflecting surface and the optical axis form an included angle of 45 degrees; a diaphragm of the lens, a second lens element with positive refractive power having convex object-side and image-side surfaces at paraxial region; a meniscus third lens element with negative refractive power having a concave image-side surface; a fourth lens element with negative refractive power having a concave image-side surface; a fourth lens element with positive refractive power having a concave object-side surface and a convex image-side surface; a sixth lens element with negative refractive power having an M-shaped configuration and a reverse curvature on the image-side surface. The five lenses behind the prism are aspheric plastic lenses, a diaphragm is arranged between the prism and the second lens P2, and the following conditions are met:
0.3<Rg1/Rg2<0.47
-2.4<Sag1-t1-t2-t3<-2.47
ts-tp＝0.12
1.74<TTL/imgh<1.81
-5.1<f3/f<-1.8
1.1<f5/f<1.65
-1.4<f/f6<-1.2
2.3<ct2/ct3<3.62
2.34<f4/f6<4.6
0.1<sag4-sag5<0.26
-2.7<R22/R21<-2
1.4<oal2/oal3<1.72
-8.6<R51/R42<4.35
0.9<(r16-r17)/(r16+r17)<1.4
bfl-sag6>0.55
wherein R isg1Is the concave curvature radius, R, of the glass lens G1g1The radius of curvature of the convex surface of the glass lens G1 is shown in the specification, sag1 is the rise of the edge of the concave surface of the glass lens G1, t1 is the central thickness of the lens G1, t2 is the spacing distance between the center of the lens G1 and the prism, and t3 is the linear distance from the center of the incident surface of the prism to the center of the inclined surface; ts is the distance from the diaphragm to the midpoint of the second lens, and tp is the distance between the light emergent surface of the prism and the diaphragm; TTL is the distance from the top of the front end of the second lens to the image plane, and Imgh is half the image height. f is the effective focal length of the lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens; the center thickness of the second lens is ct2, and the center thickness of the third lens is ct 3; sag4 and sag5 are fourth and fifth lens edge saggitals, respectively; r22 and R21 are the second lens image-side and object-side radii of curvature, respectively; r51 and R42 are the fifth lens object side radius of curvature and the fourth lens image side radius of curvature, respectively; oal2 is the length from the second lens center vertex to the fourth lens maximum vector height, oal3 is the length from the fifth lens object-side maximum vector height to the sixth lens image-side maximum vector height; r16 and R17 are radii of curvature of the object-side and image-side surfaces of the sixth lens, respectively. bfl is the distance from the last lens to the image plane, and sag6 is the maximum rise of the last lens.
The two surfaces of the glass lens G1 are spherical surfaces, and one surface is a convex surface; the optical reflection element is a 45 ° prism. The main ray angle is more than 30 degrees, and the long focus camera system
The second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all even-order aspheric plastic lenses, and aspheric coefficients meet the following equation:
Z＝cy2/[1+{1－(1+k)c2y2}+1/2]+A4y4+A6y6+A8y8+A10y10+A12y12+A14y14+ A16y16
wherein Z is aspheric sagittal height, c is aspheric paraxial curvature, y is lens caliber, k is cone coefficient, A4Is a 4-order aspheric coefficient, A6Is a 6-degree aspheric surface coefficient, A8Is an 8 th order aspheric surface coefficient, A10Is a 10 th order aspheric surface coefficient, A12Is a 12 th order aspheric surface coefficient, A14Is a 14 th order aspheric coefficient, A16Is a 16-degree aspheric coefficient.
The specific design parameters of the lens are shown in tables 1 and 2:
TABLE 1
TABLE 2
| Flour mark | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 7 | -0.78054 | -0.01254 | 0.01605 | -0.07375 | 0.25315 | -0.44715 | 0.45053 | -0.18658 |
| 8 | 6.99718 | -0.08410 | 0.40125 | -0.51190 | -0.71266 | 3.01477 | -3.19337 | 1.07358 |
| 9 | -80.99889 | 0.05849 | 0.10585 | 1.16760 | -5.85860 | 11.18368 | -9.74455 | 3.11548 |
| 10 | -36.95228 | 0.01001 | 0.03625 | 1.56845 | -4.11149 | 4.06141 | -0.90266 | -0.56446 |
| 11 | 0.00000 | 0.16027 | 1.03214 | 4.01811 | -8.06854 | 8.92979 | -5.01959 | 1.23995 |
| 12 | -5.93038 | 0.13074 | 0.88687 | 2.59215 | -5.30568 | 6.28904 | -3.85597 | 0.95692 |
| 13 | -76.52285 | 0.04509 | 0.00511 | 0.54792 | -1.45713 | 1.60826 | -0.83819 | 0.17728 |
| 14 | -22.07437 | -0.20880 | 0.55144 | 0.34878 | 0.24774 | -0.03547 | -0.00598 | 0.00165 |
| 15 | 59.74219 | 0.10077 | 0.46458 | -0.67633 | 0.38599 | -0.08333 | -0.00758 | 0.00409 |
| 16 | -0.31185 | 0.38386 | -0.14980 | 0.00997 | 0.02496 | -0.01232 | 0.00264 | -0.00022 |
In this example, the half-image height was 2.322mm, and the field angle FOV was 71 °
Rg1/Rg2＝0.304
Sag1-t1-t2-t3＝-2.411
ts-tp＝0.12
TTL/imgh＝1.775
f3/f＝-1.88
f5/f＝1.644
f/f6＝-1.235
ct2/ct3＝3.444
f4/f6＝4.438
sag4-sag5＝0.213
R22/R21＝-2.326
oal2/oal3＝1.531
R51/R42＝3.303
(r16-r17)/(r16+r17)＝1.284
bfl-sag6＝0.58
Referring to fig. 1, each lens of the lens is symmetrical in shape, so that the lens is convenient to mold and produce, and the distance between lenses is reasonable, so that the structural design at the later stage is convenient.
Referring to fig. 3, a defocus graph of the lens represents a slight distance from a focal point of each field of view to an image plane, different curves represent different fields of view, a solid line is a meridian direction, and a dotted line is a sagittal direction. The vertex of each curve represents the diffraction value of the field of view, and the higher the value of the vertical axis corresponding to the vertex is, the closer the vertex is to the center, the better the imaging is
Referring to fig. 4, the astigmatic field curvature of the lens shown, different curves represent different wavelengths, S represents sagittal field curvature, and T represents meridional field curvature, the difference between the two curves is the astigmatism of the system, astigmatism and field curvature are important aberrations affecting the rays of the off-axis field of view, the imaging quality of the off-axis field of view is seriously affected by too much astigmatism, and the central and peripheral images are not in the same plane due to the field curvature.
Referring to fig. 5, the optical distortion curve of the lens is shown, the distortion does not affect the definition of an image, but causes system deformation, and the distortion of the system is less than 2%, and the influence on the imaging is small.
Example 2
TABLE 3
TABLE 4
| Flour mark | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 7 | -0.7456 | -0.0117 | -0.0086 | 0.0726 | -0.2193 | 0.3856 | -0.3061 | 0.0934 |
| 8 | 5.8168 | 0.1172 | 0.8767 | -2.9467 | 5.1156 | -4.6050 | 1.7937 | -0.2157 |
| 9 | -80.9989 | 0.0323 | 0.6295 | 1.3939 | 0.0335 | 3.9499 | -5.2035 | 1.9900 |
| 10 | -27.4902 | 0.0140 | 0.2942 | 0.2157 | -1.7797 | 2.3022 | -0.5167 | -0.5045 |
| 11 | 0.0000 | -0.1328 | 0.5632 | 1.5750 | 2.3202 | 1.6845 | 0.0265 | -0.3376 |
| 12 | -11.9728 | 0.1133 | 0.6079 | -1.1030 | -1.9748 | 2.5634 | -1.7362 | 0.4606 |
| 13 | -76.5229 | 0.0891 | -0.0579 | 0.5444 | -1.3307 | 1.5471 | -0.9252 | 0.2344 |
| 14 | -22.0744 | -0.0846 | 0.2125 | -0.1494 | 0.1216 | -0.1136 | 0.0513 | -0.0079 |
| 15 | 59.7422 | -0.2139 | 0.0381 | -0.3404 | 0.6084 | -0.5047 | 0.1900 | -0.0266 |
| 16 | -0.3310 | 0.4471 | -0.3650 | 0.2606 | -0.1233 | 0.0366 | -0.0061 | 0.0005 |
In this embodiment, the half-image height is 2.322mm, and the field angle FOV is 72 °
Rg1/Rg2＝0.345
Sag1-t1-t2-t3＝-2.421
ts-tp＝0.12
TTL/imgh＝1.746
f3/f＝-1.841
f5/f＝1.552
f/f6＝-1.219
ct2/ct3＝3.444
f4/f6＝4.438
sag4-sag5＝0.252
R22/R21＝-2.37
oal2/oal3＝1.43
R51/R42＝5.044
(r16-r17)/(r16+r17)＝1.313
bfl-sag6＝0.55
Referring to fig. 7, a defocus graph of the lens represents a slight distance from a focal point to an image plane of each field of view, different curves represent different fields of view, a solid line is a meridian direction, and a dashed line is a sagittal direction. The vertex of each curve represents the diffraction value of the field of view, and the higher the value of the vertical axis corresponding to the vertex is, the closer the vertex is to the center, the better the imaging is
Referring to fig. 8, the astigmatic field curvature of the lens shown, different curves represent different wavelengths, S represents sagittal field curvature, and T represents meridional field curvature, the difference between the two curves is the astigmatism of the system, astigmatism and field curvature are important aberrations affecting the rays of the off-axis field of view, the imaging quality of the off-axis field of view is seriously affected by too much astigmatism, and the central and peripheral images are not in the same plane due to the field curvature.
Referring to fig. 9, the optical distortion curve of the lens is shown, the distortion does not affect the definition of an image, but causes system deformation, and the distortion of the system is less than 2%, and the influence on the imaging is small.
Example 3
TABLE 5
TABLE 6
| Flour mark | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 7 | -0.8586 | 0.0074 | -0.1887 | 1.0826 | -3.3032 | 5.6356 | -4.9760 | 1.7844 |
| 8 | 7.0159 | -0.0329 | 0.3940 | -0.3291 | 2.5139 | 7.7260 | -8.4312 | 3.2680 |
| 9 | -80.9989 | 0.0442 | 0.2401 | 1.6354 | -10.2258 | 21.7729 | -21.0406 | 7.7238 |
| 10 | 40.7712 | 0.0158 | -0.1665 | 5.0103 | -18.0715 | 29.2857 | 23.1140 | 7.1548 |
| 11 | 0.0525 | 0.0201 | -0.8421 | 7.5205 | -21.9640 | 32.0174 | -23.4427 | 6.8454 |
| 12 | -14.9318 | -0.0370 | 0.3039 | 1.6805 | -4.2319 | 5.4837 | 3.5680 | 0.9234 |
| 13 | 3.2194 | -0.0581 | 0.4112 | -0.5960 | 0.1800 | 0.3828 | -0.3947 | 0.1248 |
| 14 | 23.5709 | 0.1753 | 0.7126 | 1.1302 | 0.9255 | -0.4260 | 0.1102 | -0.0133 |
| 15 | 99.0000 | 0.1691 | 0.5215 | -1.0577 | 0.8813 | -0.3718 | 0.0729 | -0.0047 |
| 16 | -0.9663 | 0.4838 | -0.3539 | 0.1831 | -0.0629 | 0.0143 | -0.0019 | 0.0001 |
In this example, the half-image height was 2.322mm, and the field angle FOV was 71.5 degrees
Rg1/Rg2＝0.432
Sag1-t1-t2-t3＝-2.441
ts-tp＝0.12
TTL/imgh＝1.798
f3/f＝-5.07
f5/f＝1.282
f/f6＝-1.317
ct2/ct3＝2.878
f4/f6＝3.341
sag4-sag5＝0.2
R22/R21＝-2.543
oal2/oal3＝1.633
R51/R42＝3.502
(r16-r17)/(r16+r17)＝1.029
bfl-sag6＝0.56
Referring to fig. 11, a defocus graph of the lens represents a slight distance from a focal point to an image plane of each field of view, different curves represent different fields of view, a solid line is a meridional direction, and a dashed line is a sagittal direction. The vertex of each curve represents the diffraction value of the field of view, and the higher the value of the vertical axis corresponding to the vertex is, the closer the vertex is to the center, the better the imaging is
Referring to fig. 12, the astigmatic field curvature of the lens shown, different curves represent different wavelengths, S represents sagittal field curvature, and T represents meridional field curvature, the difference between the two curves is the astigmatism of the system, astigmatism and field curvature are important aberrations affecting the rays of the off-axis field of view, the imaging quality of the off-axis field of view is seriously affected by too much astigmatism, and the field curvature causes the central and peripheral images to be out of a plane.
Referring to fig. 13, the optical distortion curve of the lens is shown, the distortion does not affect the definition of the image, but causes the system deformation, the distortion of the system is less than 2%, and the influence on the imaging is small
Example 4
TABLE 7
TABLE 8
| Flour mark | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 7 | 0.8666 | 0.0023 | -0.1110 | 0.5571 | 1.4791 | 2.2547 | -1.7905 | 0.5880 |
| 8 | 7.0159 | 0.0768 | 0.8951 | 2.8117 | 4.0986 | -2.1188 | -0.6820 | 0.7546 |
| 9 | -80.9989 | 0.0266 | 1.0560 | 2.5696 | 1.4423 | 3.7781 | -6.5044 | 2.9206 |
| 10 | 40.7712 | -0.1056 | 1.1939 | 1.6409 | -0.8836 | 5.0533 | -5.5039 | 1.9774 |
| 11 | 0.0525 | 0.1427 | 0.5783 | 0.8135 | 5.5093 | 10.2435 | -8.7974 | 2.9388 |
| 12 | -14.9318 | 0.0785 | 0.1532 | 0.1507 | -0.4222 | 1.1238 | -0.9869 | 0.3085 |
| 13 | 94.4088 | 0.0597 | 0.4111 | 0.5969 | 0.1739 | 0.3828 | -0.3947 | 0.1248 |
| 14 | -23.5709 | -0.1001 | 0.4954 | 0.8021 | 0.6247 | -0.2737 | 0.0728 | -0.0100 |
| 15 | 75.6023 | 0.1384 | 0.5251 | -1.0568 | 0.8814 | 0.3718 | 0.0729 | -0.0047 |
| 16 | -0.7212 | 0.4247 | -0.2702 | 0.1207 | -0.0340 | 0.0060 | -0.0006 | 0.0000 |
In this example, the half-image height was 2.322mm, and the field angle FOV was 71.6 °
Rg1/Rg2＝0.396
Sag1-t1-t2-t3＝-2.431
ts-tp＝0.12
TTL/imgh＝1.802
f3/f＝-4.454
f5/f＝1.197
f/f6＝-1.376
ct2/ct3＝2.998
f4/f6＝2.559
sag4-sag5＝0.193
R22/R21＝-2.554
oal2/oal3＝1.606
R51/R42＝4.322
(r16-r17)/(r16+r17)＝1.297
bfl-sag6＝0.56
Referring to fig. 15, a defocus graph of the lens represents a slight distance from a focal point to an image plane of each field of view, different curves represent different fields of view, a solid line is a meridian direction, and a dashed line is a sagittal direction. The vertex of each curve represents the diffraction value of the field of view, and the higher the value of the vertical axis corresponding to the vertex is, the closer the vertex is to the center, the better the imaging is
Referring to fig. 16, the astigmatic field curvature of the lens shown, different curves represent different wavelengths, S represents sagittal field curvature, and T represents meridional field curvature, the difference between them is the astigmatism of the system, astigmatism and field curvature are important aberrations affecting the rays of the off-axis field of view, the imaging quality of the off-axis field of view is seriously affected by too much astigmatism, and the field curvature causes the central and peripheral images to be out of plane.
Referring to fig. 17, the optical distortion curve of the lens is shown, the distortion does not affect the definition of the image, but causes the system deformation, the distortion of the system is less than 2%, and the influence on the image formation is small
Example 5
TABLE 9
Watch 10
| Flour mark | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 7 | -0.7558 | -0.00703 | -0.11091 | 0.854933 | -3.96171 | 11.86272 | -22.7345 | 26.97874 |
| 8 | 8.967886 | -0.00749 | 0.007073 | 2.567047 | -18.0672 | 60.92066 | -119.294 | 138.482 |
| 9 | -80.9989 | 0.09799 | 0.257038 | 0.804348 | -9.43209 | 32.71668 | -64.1065 | 75.43927 |
| 10 | 43.16194 | 0.068632 | 0.198761 | 2.357303 | -15.5845 | 46.79982 | -84.8945 | 93.91266 |
| 11 | -3.24904 | -0.1369 | 0.278775 | 7.124903 | 33.05393 | 86.96683 | -144.646 | 149.4387 |
| 12 | 10.34046 | -0.17196 | -0.4199 | 4.543893 | -17.099 | 37.1899 | -50.7278 | 42.88999 |
| 13 | -76.5229 | -0.00507 | -0.05633 | 0.569069 | -0.45299 | -2.20578 | 6.343671 | -7.4869 |
| 14 | -22.1291 | 0.002037 | -0.2314 | 1.341768 | -2.90849 | 3.76865 | -3.17401 | 1.657868 |
| 15 | 79.19159 | 0.231164 | -0.17452 | 0.499111 | -0.56782 | 0.271958 | -0.062 | 0.006592 |
| 16 | -0.50794 | 0.491597 | -0.51768 | 0.591799 | -0.49841 | 0.288977 | -0.11223 | 0.027991 |
In this example, the half-image height was 2.322mm, and the field angle FOV was 72.3 ° (see through)
Rg1/Rg2＝0.467
Sag1-t1-t2-t3＝-2.467
ts-tp＝0.12
TTL/imgh＝1.771
f3/f＝-4.899
f5/f＝1.447
f/f6＝-1.234
ct2/ct3＝2.374
f4/f6＝2.254
sag4-sag5＝0.215
R22/R21＝-2.657
oal2/oal3＝1.406
R51/R42＝-8.598
(r16-r17)/(r16+r17)＝0.947
bfl-sag6＝0.55
Referring to fig. 19, the defocus graph of the lens represents the slight distance from the focal point to the image plane of each field of view, different curves represent different fields of view, the solid line is the meridional direction, and the dashed line is the sagittal direction. The vertex of each curve represents the diffraction value of the field of view, and the higher the value of the vertical axis corresponding to the vertex is, the closer the vertex is to the center, the better the imaging is
Referring to fig. 20, the astigmatic field curvature of the lens is shown, where different curves represent different wavelengths, S represents sagittal field curvature, and T represents meridional field curvature, where the difference between the two curves is astigmatism of the system, and astigmatism and field curvature are important aberrations affecting the rays of the off-axis field of view, where too much astigmatism can seriously affect the imaging quality of the off-axis field of view, and field curvature can cause the central and peripheral images to be out of plane.
Referring to fig. 21, the optical distortion curve of the lens is shown, the distortion does not affect the definition of an image, but causes system deformation, and the distortion of the system is less than 2%, and the influence on the imaging is small.
Claims (10)
1. A large field angle long focus periscope lens, in order from an object side to an image side, comprising:
the first glass lens G1 has negative refractive power, and has a concave object side and a convex image side, wherein both surfaces are spherical;
the included angle between the reflecting surface and the optical axis of the prism is 45 degrees;
the second lens element P2 with positive refractive power has a convex object-side surface at paraxial region and a concave image-side surface at paraxial region;
the third lens element P3 with negative refractive power has a meniscus shape with its image-side surface being concave at paraxial region;
the fourth lens element P4 with refractive power has a concave object-side surface and a concave image-side surface at paraxial region;
the fifth lens element P5 with positive refractive power has a convex image-side surface at paraxial region;
the sixth lens element P5 with negative refractive power has an M-shaped configuration and a reverse curvature on the image side;
the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are aspheric plastic lenses, the field angle FOV is larger than 71 degrees, the optical back focus is larger than 0.55 degrees, the maximum chief ray angle is larger than 33 degrees, the resolving power is improved through the combination of the spherical lens and the aspheric lens, the direction of an optical axis is changed by a 45-degree reflecting prism, the periscopic function is realized, a diaphragm is arranged between the prism and the second lens P2, and the chief ray angle is larger than 30;
the following conditional expressions are satisfied:
0.3<Rg1/Rg2<0.47
-2.4<Sag1-t1-t2-t3<-2.47
ts-tp＝0.12
1.74<TTL/imgh<1.81
-5.1<f3/f<-1.8
1.1<f5/f<1.65
-1.4<f/f6<-1.2
2.3<ct2/ct3<3.62
2.34<f4/f6<4.6
0.1<sag4-sag5<0.26
-2.7<R22/R21<-2
1.4<oal2/oal3<1.72
-8.6<R51/R42<4.35
0.9<(r16-r17)/(r16+r17)<1.4
bfl-sag6>0.55
wherein R isg1Is the concave curvature radius, R, of the glass lens G1g2The radius of curvature of the convex surface of the glass lens G1 is shown in the specification, sag1 is the rise of the edge of the concave surface of the glass lens G1, t1 is the central thickness of the lens G1, t2 is the spacing distance between the center of the lens G1 and the prism, and t3 is the linear distance from the center of the incident surface of the prism to the center of the inclined surface; ts is the distance from the diaphragm to the midpoint of the second lens, and tp is the distance between the light emergent surface of the prism and the diaphragm; TTL is the distance from the top point of the front end of the second lens to the image surface, and Imgh is half image height; f is the effective focal length of the lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens; the center thickness of the second lens is ct2, and the center thickness of the third lens is ct 3; sag4 and sag5 are fourth and fifth lens edge saggitals, respectively; r22 and R21 are the second lens image-side and object-side radii of curvature, respectively; r51 and R42 are the fifth lens object side radius of curvature and the fourth lens image side radius of curvature, respectively; oal2Oal3 is the length of the maximum vector height of the second lens from the central peak to the fourth lens, and the length of the maximum vector height of the object side of the fifth lens from the image side of the sixth lens; r16 and R17 are radii of curvature of the object-side and image-side surfaces of the sixth lens, respectively; bfl is the distance from the last lens to the image plane, and sag6 is the maximum rise of the last lens.
2. The periscope lens with large field angle and long focal length as claimed in claim 1, wherein a spherical glass plus 45 ° prism periscope lens, the glass lens G1 has two spherical surfaces and one convex surface; the optical reflection element is a 45-degree prism, the main ray angle is larger than 30 degrees, and the long-focus camera system is adopted.
3. The periscope lens with the large view angle and the long focal length as claimed in claim 1, wherein the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all even-order aspheric plastic lenses, and aspheric coefficients satisfy the following equation:
Z＝cy2/[1+{1－(1+k)c2y2}+1/2]+A4y4+A6y6+A8y8+A10y10+A12y12+A14y14+A16y16
wherein Z is aspheric sagittal height, c is aspheric paraxial curvature, y is lens caliber, k is cone coefficient, A4Is a 4-order aspheric coefficient, A6Is a 6-degree aspheric surface coefficient, A8Is an 8 th order aspheric surface coefficient, A10Is a 10 th order aspheric surface coefficient, A12Is a 12 th order aspheric surface coefficient, A14Is a 14 th order aspheric coefficient, A16Is a 16-degree aspheric coefficient.
4. A large field angle long focal length periscope lens as claimed in claim 1, wherein-2.4 < Sag1-t1-t2-t3< -2.47, Sag1 is the edge rise of concave surface of glass lens G1, t1 is the center thickness of lens G1, t2 is the distance between the center of lens G1 and the prism, and t3 is the straight line distance from the center of the prism light incidence plane to the center of the bevel; the formula describes the linear distance from the maximum rise of G1 to the center of the hypotenuse of the prism, namely half of the width of the whole lens and 2.5 of the width, ensures that the sizes of the front end G1 of the lens, the prism part and the rear end aspheric lens part are correspondingly connected, limits the volume of the whole lens and enables the volume of the whole lens to be miniaturized.
5. A large field angle, long focal length periscope lens according to claim 1,
ts-tp is 0.12, the formula is the position relation of the restriction diaphragm and the plastic lens P2, the diaphragm position tp is 0.04mm from the straight edge of the prism, the diaphragm is closely arranged on the prism, and if the diaphragm position tp is more than 0.04mm, the opening of the lens barrel in front of the diaphragm is in a horn shape.
6. The periscope lens with the large field angle and the long focal length as claimed in claim 1, wherein 1.74< TTL/imgh <1.81, TTL is the distance from the vertex of the aspheric lens p2 at the rear end of the prism to the image plane, so that the lens has the advantage of large aperture, the imaging effect in a dark environment is enhanced, and the length of the lens is shortened.
7. The periscope lens with the large field angle and the long focal length as claimed in claim 1, wherein the focal length f3 of the third lens and the effective focal length f of the lens satisfy-5.1 < f3/f < -1.8, which effectively and reasonably distributes the power of the third lens and reduces tolerance sensitivity.
8. The periscope lens with large field angle and long focal length as claimed in claim 1, wherein the focal length f5 of the fifth lens and the effective focal length f of the lens satisfy 1.1< f5/f <1.65, the included angle between the chief ray and the image plane of the general prism imaging system is less than 20 °, and the included angle between the chief ray and the image plane of the imaging system is more than 30 ° at most.
9. The periscope lens of claim 1, wherein the focal length and effective focal length of the sixth lens satisfy-1.4 < f/f6< -1.2, and the focal length f4 and the focal length f6 of the fourth lens satisfy 2.34< f4/f6<4.6, so as to correct the aberration of the system and to correct the curvature of field of the fringe field.
10. A large field angle, long focal length periscope lens as claimed in claim 1, wherein the edge sags 4 of the fourth lens image-side surface and the edge sags 5 of the fifth lens object-side surface satisfy the formula 0.1< sag4-sag5<0.26, which limits the fourth lens and fifth lens edge separation;
the curvature radius R22 of the image side surface and the curvature radius R21 of the object side surface of the second lens meet-2.7 < R22/R21< -2;
the curvature radius r16 of the object side surface and the curvature radius r17 of the image side surface of the sixth lens satisfy (r16-r17)/(r16+ r 17);
the central thickness ct2 of the second lens and the central thickness of the third lens satisfy the formula 2.3< ct2/ct3< 3.62;
the curvature radius R51 of the object side surface of the fifth lens and the curvature radius of the image side surface of the fourth lens meet the formula-8.6 < R51/R42< 4.35;
the distance bfl from the center of the last lens to the image plane subtracts the maximum sag6 of the image side of the last lens, namely the optical back focus meets bfl-sag6>0.55, the above formula is the limitation of the optical back focus, and the system focusing is facilitated when the distance is larger than 0.55.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811577060.4A CN111352212A (en) | 2018-12-23 | 2018-12-23 | Large-view-field angle long-focus periscope lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811577060.4A CN111352212A (en) | 2018-12-23 | 2018-12-23 | Large-view-field angle long-focus periscope lens |
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| Publication Number | Publication Date |
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| CN111352212A true CN111352212A (en) | 2020-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811577060.4A Pending CN111352212A (en) | 2018-12-23 | 2018-12-23 | Large-view-field angle long-focus periscope lens |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022056727A1 (en) * | 2020-09-16 | 2022-03-24 | 欧菲光集团股份有限公司 | Optical system, camera module, and electronic device |
| WO2022120792A1 (en) * | 2020-12-11 | 2022-06-16 | 欧菲光集团股份有限公司 | Optical system, camera module, and terminal device |
| WO2024055279A1 (en) * | 2022-09-16 | 2024-03-21 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Imaging lens assembly, camera module and imaging device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901586A (en) * | 2014-04-13 | 2014-07-02 | 浙江舜宇光学有限公司 | 3D interaction-type projection lens |
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2018
- 2018-12-23 CN CN201811577060.4A patent/CN111352212A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901586A (en) * | 2014-04-13 | 2014-07-02 | 浙江舜宇光学有限公司 | 3D interaction-type projection lens |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022056727A1 (en) * | 2020-09-16 | 2022-03-24 | 欧菲光集团股份有限公司 | Optical system, camera module, and electronic device |
| WO2022120792A1 (en) * | 2020-12-11 | 2022-06-16 | 欧菲光集团股份有限公司 | Optical system, camera module, and terminal device |
| WO2024055279A1 (en) * | 2022-09-16 | 2024-03-21 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Imaging lens assembly, camera module and imaging device |
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